// "Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman
// Ken Silverman's official web site: "http://www.advsys.net/ken"
// See the included license file "BUILDLIC.TXT" for license info.
//
// This file has been modified from Ken Silverman's original release
// by Jonathon Fowler (jf@jonof.id.au)


#define ENGINE

#if (PNG_LIBPNG_VER > 10599)
# include <string.h>
#endif
#include "compat.h"
#include "build.h"
#include "editor.h"
#include "pragmas.h"
#include "cache1d.h"
#include "a.h"
#include "osd.h"
#include "crc32.h"
#include "xxhash.h"
#include "lz4.h"
#include "colmatch.h"

#include "baselayer.h"
#include "scriptfile.h"

#ifdef USE_OPENGL
# include "glbuild.h"
# include "mdsprite.h"
# ifdef POLYMER
#  include "polymer.h"
# endif
# include "hightile.h"
# include "polymost.h"
# ifdef _WIN32
#  define WIN32_LEAN_AND_MEAN
#  include <windows.h>
# endif
#endif

#ifdef USE_LIBPNG
//# include <setjmp.h>
# include <png.h>
#endif

#include <math.h>  // pow

#include "engine_priv.h"

#ifdef LUNATIC
# include "lunatic.h"
L_State g_engState;
#endif

#define CACHEAGETIME 16

//////////
// Compilation switches for optional/extended engine features

#if !defined(__arm__) && !defined(GEKKO)
# define HIGH_PRECISION_SPRITE
#endif

#if !defined EDUKE32_TOUCH_DEVICES && !defined GEKKO && !defined __OPENDINGUX__
// Handle absolute z difference of floor/ceiling to camera >= 1<<24.
// Also: higher precision view-relative x and y for drawvox().
# define CLASSIC_Z_DIFF_64
#endif

#define MULTI_COLUMN_VLINE
//#define DEBUG_TILESIZY_512
//#define DEBUG_TILEOFFSETS
//////////

#ifdef LUNATIC
# if !defined DEBUG_MAIN_ARRAYS
LUNATIC_EXTERN const int32_t engine_main_arrays_are_static = 0;  // for Lunatic
# else
LUNATIC_EXTERN const int32_t engine_main_arrays_are_static = 1;
# endif

#if MAXSECTORS==MAXSECTORSV8
LUNATIC_EXTERN const int32_t engine_v8 = 1;
#else
LUNATIC_EXTERN const int32_t engine_v8 = 0;
#endif
#endif

#ifdef DEBUGGINGAIDS
float debug1, debug2;
#endif

int32_t mapversion=7; // JBF 20040211: default mapversion to 7
int32_t g_loadedMapVersion = -1;  // -1: none (e.g. started new)
usermaphack_t g_loadedMapHack;  // used only for the MD4 part

int32_t compare_usermaphacks(const void *a, const void *b)
{
    return Bmemcmp(((usermaphack_t const *) a)->md4, ((usermaphack_t const *) b)->md4, 16);
}
usermaphack_t *usermaphacks;
int32_t num_usermaphacks;

static int32_t get_mapversion(void);

// Handle nonpow2-ysize walls the old way?
static inline int32_t oldnonpow2(void)
{
#if !defined CLASSIC_NONPOW2_YSIZE_WALLS
    return 1;
#else
    return (g_loadedMapVersion < 10);
#endif
}

static void drawpixel_safe(void *s, char a)
{
#if defined __GNUC__
    if (__builtin_expect((intptr_t)s >= frameplace && (intptr_t)s < frameplace+bytesperline*ydim, 1))
#else
    if ((intptr_t)s >= frameplace && (intptr_t)s < frameplace+bytesperline*ydim)
#endif
        drawpixel(s, a);
#ifdef DEBUGGINGAIDS
    else
    {
        const char c = editorcolors[15];

        drawpixel((intptr_t *)frameplace, c);
        drawpixel((intptr_t *)frameplace+1, c);
        drawpixel((intptr_t *)frameplace+2, c);
        drawpixel((intptr_t *)frameplace+bytesperline, c);
        drawpixel((intptr_t *)frameplace+bytesperline+1, c);
        drawpixel((intptr_t *)frameplace+bytesperline+2, c);
        drawpixel((intptr_t *)frameplace+2*bytesperline, c);
        drawpixel((intptr_t *)frameplace+2*bytesperline+1, c);
        drawpixel((intptr_t *)frameplace+2*bytesperline+2, c);
    }
#endif
}

int16_t pskybits_override = -1;

//void loadvoxel(int32_t voxindex) { UNREFERENCED_PARAMATER(voxindex); }
int16_t tiletovox[MAXTILES];
int32_t usevoxels = 1;
#ifdef USE_OPENGL
static char *voxfilenames[MAXVOXELS], g_haveVoxels=0;  // for deferred voxel->model conversion
#endif
//#define kloadvoxel loadvoxel

int32_t novoxmips = 1;
int32_t editorgridextent = 131072;

//These variables need to be copied into BUILD
#define MAXXSIZ 256
#define MAXYSIZ 256
#define MAXZSIZ 255
#define MAXVOXMIPS 5
#ifdef EDUKE32_TOUCH_DEVICES
# define DISTRECIPSIZ (65536+256)
#else
# define DISTRECIPSIZ 131072
#endif
intptr_t voxoff[MAXVOXELS][MAXVOXMIPS]; // used in KenBuild
static char voxlock[MAXVOXELS][MAXVOXMIPS];
int32_t voxscale[MAXVOXELS];

static int32_t ggxinc[MAXXSIZ+1], ggyinc[MAXXSIZ+1];
static int32_t lowrecip[1024], nytooclose;
static const int32_t nytoofar = DISTRECIPSIZ*16384ull - 1048576;
static uint32_t *distrecip;

static int32_t *lookups = NULL;
static int32_t dommxoverlay = 1, beforedrawrooms = 1;

static int32_t oxdimen = -1, oviewingrange = -1, oxyaspect = -1;

// r_usenewaspect is the cvar, newaspect_enable to trigger the new behaviour in the code
int32_t r_usenewaspect = 1, newaspect_enable=0;
uint32_t r_screenxy = 0;

int32_t globalflags;

int32_t curbrightness = 0, gammabrightness = 0;

float vid_gamma = DEFAULT_GAMMA;
float vid_contrast = DEFAULT_CONTRAST;
float vid_brightness = DEFAULT_BRIGHTNESS;

//Textured Map variables
static char globalpolytype;
static int16_t **dotp1, **dotp2;

static int8_t tempbuf[MAXWALLS];

// referenced from asm
#if !defined(NOASM) && defined __cplusplus
extern "C" {
#endif
int32_t ebpbak, espbak;
int32_t reciptable[2048], fpuasm;
intptr_t asm1, asm2, asm3, asm4, palookupoffse[4];
uint32_t vplce[4];
int32_t vince[4];
intptr_t bufplce[4];
int32_t globaltilesizy;
int32_t globalx1, globaly2, globalx3, globaly3;
#if !defined(NOASM) && defined __cplusplus
}
#endif

int32_t sloptable[16384];
static intptr_t slopalookup[16384];    // was 2048
#if defined(USE_OPENGL)
palette_t palookupfog[MAXPALOOKUPS];
#endif

// For every pal number, whether tsprite pal should not be taken over from
// floor pal.
// NOTE: g_noFloorPal[0] is irrelevant as it's never checked.
int8_t g_noFloorPal[MAXPALOOKUPS];

static void *pic = NULL;

// The tile file number (tilesXXX <- this) of each tile:
// 0 <= . < MAXARTFILES_BASE: tile is in a "base" ART file
// MAXARTFILES_BASE <= . < MAXARTFILES_TOTAL: tile is in a map-specific ART file
static uint8_t tilefilenum[MAXTILES];
EDUKE32_STATIC_ASSERT(MAXARTFILES_TOTAL <= 256);

static int32_t tilefileoffs[MAXTILES];
static int32_t lastageclock;

// Backup tilefilenum[] and tilefileoffs[]. These get allocated only when
// necessary (have per-map ART files).
static uint8_t *g_bakTileFileNum;
static int32_t *g_bakTileFileOffs;
static vec2_t *g_bakTileSiz;
static picanm_t *g_bakPicAnm;
// NOTE: picsiz[] is not backed up, but recalculated when necessary.

//static int32_t artsize = 0;
static int32_t cachesize = 0;

static int32_t no_radarang2 = 0;
static int16_t radarang[1280], *radarang2;

uint16_t ATTRIBUTE((used)) sqrtable[4096], ATTRIBUTE((used)) shlookup[4096+256];
const char pow2char[8] = {1,2,4,8,16,32,64,128};
const int32_t pow2long[32] =
{
    1, 2, 4, 8,
    16, 32, 64, 128,
    256, 512, 1024, 2048,
    4096, 8192, 16384, 32768,
    65536, 131072, 262144, 524288,
    1048576, 2097152, 4194304, 8388608,
    16777216, 33554432, 67108864, 134217728,
    268435456, 536870912, 1073741824, 2147483647
};

char britable[16][256]; // JBF 20040207: full 8bit precision

extern char textfont[2048], smalltextfont[2048];

static char kensmessage[128];
const char *engineerrstr = "No error";

int32_t showfirstwall=0;
int32_t showheightindicators=1;
int32_t circlewall=-1;

uint8_t blackcol;

#ifdef POLYMER
static int16_t maphacklightcnt=0;
static int16_t maphacklight[PR_MAXLIGHTS];
#endif

// forward refs
#ifdef __cplusplus
extern "C" {
#endif
#ifdef LUNATIC
extern const char *(getblendtab)(int32_t blend);
#endif
void setup_sideview_sincos(void);
int32_t getscreenvdisp(int32_t bz, int32_t zoome);
void screencoords(int32_t *xres, int32_t *yres, int32_t x, int32_t y, int32_t zoome);
int32_t scalescreeny(int32_t sy);
#ifdef YAX_ENABLE
void yax_tweakpicnums(int32_t bunchnum, int32_t cf, int32_t restore);
#endif
int32_t getinvdisplacement(int32_t *dx, int32_t *dy, int32_t dz);
#ifdef __cplusplus
}
#endif

static void scansector(int16_t startsectnum);
static void draw_rainbow_background(void);

int16_t editstatus = 0;
static int32_t global100horiz;  // (-100..300)-scale horiz (the one passed to drawrooms)


////////// YAX //////////

int32_t numgraysects = 0;
uint8_t graysectbitmap[MAXSECTORS>>3];
uint8_t graywallbitmap[MAXWALLS>>3];
int32_t autogray = 0, showinnergray = 1;

//#define YAX_DEBUG_YMOSTS

#ifdef YAX_DEBUG
// XXX: This could be replaced with the use of gethiticks().
double u64tickspersec;
#endif
#ifdef ENGINE_SCREENSHOT_DEBUG
int32_t engine_screenshot = 0;
#endif

int32_t get_alwaysshowgray(void)
{
    return showinnergray || !(editorzrange[0]==INT32_MIN && editorzrange[1]==INT32_MAX);
}

void yax_updategrays(int32_t posze)
{
    int32_t i, j;
#ifdef YAX_ENABLE
    int32_t mingoodz=INT32_MAX, maxgoodz=INT32_MIN;
#else
    UNREFERENCED_PARAMETER(posze);
#endif

    Bmemset(graysectbitmap, 0, sizeof(graysectbitmap));
    Bmemset(graywallbitmap, 0, sizeof(graywallbitmap));

    for (i=0; i<numsectors; i++)
    {
#ifdef YAX_ENABLE
        int16_t cb, fb;
        yax_getbunches(i, &cb, &fb);

        // Update grayouts due to TROR, has to be --v--       half-open      --v--
        // because only one level should ever be    v                          v
        // active.                                  v                          v
        int32_t keep = ((cb<0 || sector[i].ceilingz < posze) && (fb<0 || posze <= sector[i].floorz));
        if (autogray && (cb>=0 || fb>=0) && (sector[i].ceilingz <= posze && posze <= sector[i].floorz))
        {
            mingoodz = min(mingoodz, sector[i].ceilingz);
            maxgoodz = max(maxgoodz, sector[i].floorz);
        }
#endif
        // update grayouts due to editorzrange
        keep &= (sector[i].ceilingz >= editorzrange[0] && sector[i].floorz <= editorzrange[1]);

        if (!keep)  // outside bounds, gray out!
            graysectbitmap[i>>3] |= (1<<(i&7));
    }

#ifdef YAX_ENABLE
    if (autogray && mingoodz<=maxgoodz)
    {
        for (i=0; i<numsectors; i++)
            if (!(mingoodz <= sector[i].ceilingz && sector[i].floorz <= maxgoodz))
                graysectbitmap[i>>3] |= (1<<(i&7));
    }
#endif

    numgraysects = 0;
    for (i=0; i<numsectors; i++)
    {
        if (graysectbitmap[i>>3]&(1<<(i&7)))
        {
            numgraysects++;
            for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
                graywallbitmap[j>>3] |= (1<<(j&7));
        }
    }
}


#if !defined YAX_ENABLE
# warning Non-TROR builds are supported only for debugging. Expect savegame breakage etc...
#endif

#ifdef YAX_ENABLE
// all references to floor/ceiling bunchnums should be through the
// get/set functions!

int32_t g_nodraw = 0;
int32_t scansector_retfast = 0;
static int32_t scansector_collectsprites = 1;
int32_t yax_globalcf = -1, yax_nomaskpass=0, yax_nomaskdidit;  // engine internal
int32_t r_tror_nomaskpass = 1;  // cvar
int32_t yax_globallev = YAX_MAXDRAWS;
int32_t yax_globalbunch = -1;

// duplicated tsprites
//  [i]:
//   i==MAXDRAWS: base level
//   i<MAXDRAWS: MAXDRAWS-i-1 is level towards ceiling
//   i>MAXDRAWS: i-MAXDRAWS-1 is level towards floor
static int16_t yax_spritesortcnt[1 + 2*YAX_MAXDRAWS];
static uint16_t yax_tsprite[1 + 2*YAX_MAXDRAWS][MAXSPRITESONSCREEN];
static uint8_t yax_tsprfrombunch[1 + 2*YAX_MAXDRAWS][MAXSPRITESONSCREEN];

// drawn sectors
uint8_t yax_gotsector[MAXSECTORS>>3];  // engine internal

# if !defined NEW_MAP_FORMAT
// Game-time YAX data structures, V7-V9 map formats.
int16_t yax_bunchnum[MAXSECTORS][2];
int16_t yax_nextwall[MAXWALLS][2];

static inline int32_t yax_islockededge(int32_t line, int32_t cf)
{
    return !!(wall[line].cstat&(YAX_NEXTWALLBIT(cf)));
}

#define YAX_PTRBUNCHNUM(Ptr, Sect, Cf) (*(&Ptr[Sect].ceilingxpanning + 8*Cf))
#define YAX_BUNCHNUM(Sect, Cf) YAX_PTRBUNCHNUM(sector, Sect, Cf)

//// bunch getters/setters
int16_t yax_getbunch(int16_t i, int16_t cf)
{
    if (editstatus==0)
        return yax_bunchnum[i][cf];

    if (((*(&sector[i].ceilingstat + cf))&YAX_BIT)==0)
        return -1;

    return YAX_BUNCHNUM(i, cf);
}
# else
#  define YAX_PTRBUNCHNUM(Ptr, Sect, Cf) (*((Cf) ? &(Ptr)[Sect].floorbunch : &(Ptr)[Sect].ceilingbunch))
#  define YAX_BUNCHNUM(Sect, Cf) YAX_PTRBUNCHNUM(sector, Sect, Cf)

#  if !defined NEW_MAP_FORMAT
static inline int32_t yax_islockededge(int32_t line, int32_t cf)
{
    return (yax_getnextwall(line, cf) >= 0);
}
#  endif
# endif

// bunchnum: -1: also clear yax-nextwalls (forward and reverse)
//           -2: don't clear reverse yax-nextwalls
//           -3: don't clear either forward or reverse yax-nextwalls
void yax_setbunch(int16_t i, int16_t cf, int16_t bunchnum)
{
    if (editstatus==0)
    {
#ifdef NEW_MAP_FORMAT
        YAX_BUNCHNUM(i, cf) = bunchnum;
#else
        yax_bunchnum[i][cf] = bunchnum;
#endif
        return;
    }

    if (bunchnum < 0)
    {
        int32_t j;
        int16_t ynw;

        if (bunchnum > -3)
        {
            // TODO: for in-game too?
            for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
            {
                ynw = yax_getnextwall(j, cf);
                if (ynw >= 0)
                {
                    if (bunchnum > -2)
                        yax_setnextwall(ynw, !cf, -1);
                    yax_setnextwall(j, cf, -1);
                }
            }
        }

#if !defined NEW_MAP_FORMAT
        *(&sector[i].ceilingstat + cf) &= ~YAX_BIT;
        // NOTE: Don't reset xpanning-as-index, since we can be called from
        // e.g. Mapster32's "Inner loop made into new sector" functionality.
//        YAX_BUNCHNUM(i, cf) = 0;
#else
        YAX_BUNCHNUM(i, cf) = -1;
#endif
        return;
    }

#if !defined NEW_MAP_FORMAT
    *(&sector[i].ceilingstat + cf) |= YAX_BIT;
#endif
    YAX_BUNCHNUM(i, cf) = bunchnum;
}

void yax_setbunches(int16_t i, int16_t cb, int16_t fb)
{
    yax_setbunch(i, YAX_CEILING, cb);
    yax_setbunch(i, YAX_FLOOR, fb);
}

# if !defined NEW_MAP_FORMAT
//// nextwall getters/setters
int16_t yax_getnextwall(int16_t wal, int16_t cf)
{
    if (editstatus==0)
        return yax_nextwall[wal][cf];

    if (!yax_islockededge(wal, cf))
        return -1;

    return YAX_NEXTWALL(wal, cf);
}

// unchecked!
void yax_setnextwall(int16_t wal, int16_t cf, int16_t thenextwall)
{
    if (editstatus==0)
    {
        yax_nextwall[wal][cf] = thenextwall;
        return;
    }

    if (thenextwall >= 0)
    {
        wall[wal].cstat |= YAX_NEXTWALLBIT(cf);
        YAX_NEXTWALL(wal, cf) = thenextwall;
    }
    else
    {
        wall[wal].cstat &= ~YAX_NEXTWALLBIT(cf);
        YAX_NEXTWALL(wal, cf) = YAX_NEXTWALLDEFAULT(cf);
    }
}
# endif

// make one step in the vertical direction, and if the wall we arrive at
// is red, return its nextsector.
int16_t yax_vnextsec(int16_t line, int16_t cf)
{
    int16_t const ynw = yax_getnextwall(line, cf);
    return (ynw < 0) ? -1 : wall[ynw].nextsector;
}


//// in-struct --> array transfer (only resetstat==0); list construction
// resetstat:  0: reset and read data from structs and construct linked lists etc.
//             1: only reset
//             2: read data from game-time arrays and construct linked lists etc.
void yax_update(int32_t resetstat)
{
    int32_t i;
#if !defined NEW_MAP_FORMAT
    int32_t j;
    const int32_t oeditstatus=editstatus;
#endif
    int16_t cb, fb;

    if (resetstat != 2)
        numyaxbunches = 0;

    for (i=0; i<MAXSECTORS; i++)
    {
#if !defined NEW_MAP_FORMAT
        if (resetstat != 2 || i>=numsectors)
            yax_bunchnum[i][0] = yax_bunchnum[i][1] = -1;
#endif
        nextsectbunch[0][i] = nextsectbunch[1][i] = -1;
    }
    for (i=0; i<YAX_MAXBUNCHES; i++)
        headsectbunch[0][i] = headsectbunch[1][i] = -1;
#if !defined NEW_MAP_FORMAT
    for (i=0; i<MAXWALLS; i++)
        if (resetstat != 2 || i>=numwalls)
            yax_nextwall[i][0] = yax_nextwall[i][1] = -1;
#endif

    if (resetstat==1)
        return;

    // Constuct singly linked list of sectors-of-bunch.

#if !defined NEW_MAP_FORMAT
    // Read bunchnums directly from the sector struct in yax_[gs]etbunch{es}!
    editstatus = (resetstat==0);
    // NOTE: Use oeditstatus to check for in-gamedness from here on!
#endif

    if (resetstat==0)
    {
        // make bunchnums consecutive
        uint8_t *const havebunch = (uint8_t *)tempbuf;
        uint8_t *const bunchmap = havebunch + (YAX_MAXBUNCHES>>3);
        int32_t dasub = 0;

        Bmemset(havebunch, 0, YAX_MAXBUNCHES>>3);
        for (i=0; i<numsectors; i++)
        {
            yax_getbunches(i, &cb, &fb);
            if (cb>=0)
                havebunch[cb>>3] |= (1<<(cb&7));
            if (fb>=0)
                havebunch[fb>>3] |= (1<<(fb&7));
        }

        for (i=0; i<YAX_MAXBUNCHES; i++)
        {
            if ((havebunch[i>>3]&(1<<(i&7)))==0)
            {
                bunchmap[i] = 255;
                dasub++;
                continue;
            }

            bunchmap[i] = i-dasub;
        }

        for (i=0; i<numsectors; i++)
        {
            yax_getbunches(i, &cb, &fb);
            if (cb>=0)
                yax_setbunch(i, YAX_CEILING, bunchmap[cb]);
            if (fb>=0)
                yax_setbunch(i, YAX_FLOOR, bunchmap[fb]);
        }
    }

    // In-struct --> array transfer (resetstat==0 and !defined NEW_MAP_FORMAT)
    // and list construction.
    for (i=numsectors-1; i>=0; i--)
    {
        yax_getbunches(i, &cb, &fb);
#if !defined NEW_MAP_FORMAT
        if (resetstat==0)
        {
            yax_bunchnum[i][0] = cb;
            yax_bunchnum[i][1] = fb;
        }
#endif

        if (cb >= 0)
        {
#if !defined NEW_MAP_FORMAT
            if (resetstat==0)
                for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
                {
                    if (yax_islockededge(j,YAX_CEILING))
                    {
                        yax_nextwall[j][0] = YAX_NEXTWALL(j,0);
                        if (oeditstatus==0)
                            YAX_NEXTWALL(j,0) = 0;  // reset lotag!
                    }
                }
#endif
            if (headsectbunch[0][cb] == -1)
            {
                headsectbunch[0][cb] = i;
                // not duplicated in floors, since every extended ceiling
                // must have a corresponding floor:
                if (resetstat==0)
                    numyaxbunches++;
            }
            else
            {
                int32_t tmpsect = headsectbunch[0][cb];
                headsectbunch[0][cb] = i;
                nextsectbunch[0][i] = tmpsect;
            }
        }

        if (fb >= 0)
        {
#if !defined NEW_MAP_FORMAT
            if (resetstat==0)
                for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
                {
                    if (yax_islockededge(j,YAX_FLOOR))
                    {
                        yax_nextwall[j][1] = YAX_NEXTWALL(j,1);
                        if (oeditstatus==0)
                            YAX_NEXTWALL(j,1) = -1;  // reset extra!
                    }
                }
#endif
            if (headsectbunch[1][fb] == -1)
                headsectbunch[1][fb] = i;
            else
            {
                int32_t tmpsect = headsectbunch[1][fb];
                headsectbunch[1][fb] = i;
                nextsectbunch[1][i] = tmpsect;
            }
        }
    }

#if !defined NEW_MAP_FORMAT
    editstatus = oeditstatus;
#else
    mapversion = get_mapversion();
#endif
}

int32_t yax_getneighborsect(int32_t x, int32_t y, int32_t sectnum, int32_t cf)
{
    int16_t bunchnum = yax_getbunch(sectnum, cf);
    int32_t i;

    if (bunchnum < 0)
        return -1;

    for (SECTORS_OF_BUNCH(bunchnum, !cf, i))
        if (inside(x, y, i)==1)
            return i;

    return -1;
}

// indexed as a list:
static int16_t bunches[2][YAX_MAXBUNCHES];
// indexed with bunchnums directly:
static int16_t bunchsec[YAX_MAXBUNCHES], bunchdist[YAX_MAXBUNCHES];

static int32_t ymostallocsize = 0;  // numyaxbunches*xdimen (no sizeof(int16_t) here!)
static int16_t *yumost=NULL, *ydmost=NULL;  // used as if [numyaxbunches][xdimen]
uint8_t haveymost[YAX_MAXBUNCHES>>3];

// adapted from build.c
static void yax_getclosestpointonwall(int32_t dawall, int32_t *closestx, int32_t *closesty)
{
    int64_t i, j, wx,wy, wx2,wy2, dx, dy;

    wx = wall[dawall].x;
    wy = wall[dawall].y;
    wx2 = wall[wall[dawall].point2].x;
    wy2 = wall[wall[dawall].point2].y;

    dx = wx2 - wx;
    dy = wy2 - wy;
    i = dx*(globalposx-wx) + dy*(globalposy-wy);
    if (i <= 0) { *closestx = wx; *closesty = wy; return; }
    j = dx*dx + dy*dy;
    if (i >= j) { *closestx = wx2; *closesty = wy2; return; }
    i=((i<<15)/j)<<15;
    *closestx = wx + ((dx*i)>>30);
    *closesty = wy + ((dy*i)>>30);
}

static inline int32_t yax_walldist(int32_t w)
{
    int32_t closestx, closesty;

    yax_getclosestpointonwall(w, &closestx, &closesty);
    return klabs(closestx-globalposx) + klabs(closesty-globalposy);

//    return klabs(wall[w].x-globalposx) + klabs(wall[w].y-globalposy);
}

// calculate distances to bunches and best start-drawing sectors
static void yax_scanbunches(int32_t bbeg, int32_t numhere, const uint8_t *lastgotsector)
{
    int32_t bnchcnt, bunchnum, j, k;
    int32_t startwall, endwall;

    UNREFERENCED_PARAMETER(lastgotsector);

    scansector_retfast = 1;
    scansector_collectsprites = 0;

    for (bnchcnt=bbeg; bnchcnt<bbeg+numhere; bnchcnt++)
    {
        int32_t walldist, bestsec=-1;
        int32_t bestwalldist=INT32_MAX, bestbestdist=INT32_MAX;

        bunchnum = bunches[yax_globalcf][bnchcnt];

        for (SECTORS_OF_BUNCH(bunchnum,!yax_globalcf, k))
        {
            int32_t checkthisec = 0;

            if (inside(globalposx, globalposy, k)==1)
            {
                bestsec = k;
                bestbestdist = 0;
                break;
            }

            startwall = sector[k].wallptr;
            endwall = startwall+sector[k].wallnum;

            for (j=startwall; j<endwall; j++)
            {
/*
                if ((w=yax_getnextwall(j,!yax_globalcf))>=0)
                    if ((ns=wall[w].nextsector)>=0)
                        if ((lastgotsector[ns>>3]&(1<<(ns&7)))==0)
                            continue;
*/
                walldist = yax_walldist(j);
                if (walldist < bestwalldist)
                {
                    checkthisec = 1;
                    bestwalldist = walldist;
                }
            }

            if (checkthisec)
            {
                numscans = numbunches = 0;
                if (getrendermode() == REND_CLASSIC)
                    scansector(k);
#ifdef USE_OPENGL
                else
                    polymost_scansector(k);
#endif
                if (numbunches > 0)
                {
                    bestsec = k;
                    bestbestdist = bestwalldist;
                }
            }
        }

        bunchsec[bunchnum] = bestsec;
        bunchdist[bunchnum] = bestbestdist;
    }

    scansector_collectsprites = 1;
    scansector_retfast = 0;
}

static int yax_cmpbunches(const void *b1, const void *b2)
{
    return (bunchdist[B_UNBUF16(b2)] - bunchdist[B_UNBUF16(b1)]);
}


void yax_tweakpicnums(int32_t bunchnum, int32_t cf, int32_t restore)
{
    // for polymer, this is called before polymer_drawrooms() with restore==0
    // and after polymer_drawmasks() with restore==1

    int32_t i, dastat;
    static int16_t opicnum[2][MAXSECTORS];
#ifdef DEBUGGINGAIDS
    static uint8_t expect_restore[2][YAX_MAXBUNCHES];

    // must call this with restore == 0, 1,  0, 1,  0, 1,  ...
    Bassert(expect_restore[cf][bunchnum] == restore);
    expect_restore[cf][bunchnum] = !expect_restore[cf][bunchnum];
#endif

    for (SECTORS_OF_BUNCH(bunchnum, cf, i))
    {
        dastat = (SECTORFLD(i,stat, cf)&(128+256));

        // only consider non-masked ceilings/floors
        if (dastat==0 || (restore==1 && opicnum[cf][i]&0x8000))
        {
            if (!restore)
            {
                opicnum[cf][i] = SECTORFLD(i,picnum, cf);
                if (editstatus && showinvisibility)
                    SECTORFLD(i,picnum, cf) = MAXTILES-1;
                else //if ((dastat&(128+256))==0)
                    SECTORFLD(i,picnum, cf) = 13; //FOF;
            }
            else
            {
                SECTORFLD(i,picnum, cf) = opicnum[cf][i];
            }
#ifdef POLYMER
            // will be called only in editor
            if (getrendermode() == REND_POLYMER)
            {
                if (!restore)
                {
                    SECTORFLD(i,stat, cf) |= 128;
                    opicnum[cf][i] |= 0x8000;
                }
                else
                {
                    SECTORFLD(i,stat, cf) &= ~128;
                    SECTORFLD(i,picnum, cf) &= 0x7fff;
                    opicnum[cf][i] = 0;
                }
            }
#endif
        }
    }
}

static void yax_copytsprites()
{
    int32_t i, spritenum, gotthrough, sectnum;
    int32_t sortcnt = yax_spritesortcnt[yax_globallev];
    const spritetype *spr;

    for (i=0; i<sortcnt; i++)
    {
        spritenum = yax_tsprite[yax_globallev][i];

        gotthrough = spritenum&(MAXSPRITES|(MAXSPRITES<<1));

        spritenum &= MAXSPRITES-1;
        spr = &sprite[spritenum];
        sectnum = spr->sectnum;

        if (gotthrough == (MAXSPRITES|(MAXSPRITES<<1)))
        {
            if (yax_globalbunch != yax_tsprfrombunch[yax_globallev][i])
                continue;
        }
        else
        {
            int32_t cf = -1;

            if (gotthrough == MAXSPRITES)
                cf = YAX_CEILING;  // sprite got here through the ceiling of lower sector
            else if (gotthrough == (MAXSPRITES<<1))
                cf = YAX_FLOOR;  // sprite got here through the floor of upper sector

            if (cf != -1)
            {
                if ((yax_globallev-YAX_MAXDRAWS)*(-1 + 2*cf) > 0)
                    if (yax_getbunch(sectnum, cf) != yax_globalbunch)
                        continue;

                sectnum = yax_getneighborsect(spr->x, spr->y, sectnum, cf);
                if (sectnum < 0)
                    continue;
            }
        }

        if (spritesortcnt >= MAXSPRITESONSCREEN)
            break;

        Bmemcpy(&tsprite[spritesortcnt], spr, sizeof(spritetype));
        tsprite[spritesortcnt].owner = spritenum;
        tsprite[spritesortcnt].extra = 0;
        tsprite[spritesortcnt].sectnum = sectnum;  // potentially tweak sectnum!
        spritesortcnt++;
    }
}


void yax_preparedrawrooms(void)
{
    if (getrendermode() == REND_POLYMER || numyaxbunches==0)
        return;

    g_nodraw = 1;
    Bmemset(yax_spritesortcnt, 0, sizeof(yax_spritesortcnt));
    Bmemset(haveymost, 0, (numyaxbunches+7)>>3);

    if (getrendermode() == REND_CLASSIC && ymostallocsize < xdimen*numyaxbunches)
    {
        ymostallocsize = xdimen*numyaxbunches;
        yumost = (int16_t *)Xrealloc(yumost, ymostallocsize*sizeof(int16_t));
        ydmost = (int16_t *)Xrealloc(ydmost, ymostallocsize*sizeof(int16_t));
    }
}

void yax_drawrooms(void (*SpriteAnimFunc)(int32_t,int32_t,int32_t,int32_t),
                   int16_t sectnum, int32_t didmirror, int32_t smoothr)
{
    static uint8_t havebunch[YAX_MAXBUNCHES>>3];

    const int32_t horiz = global100horiz;

    int32_t i, j, k, lev, cf, nmp;
    int32_t bnchcnt, bnchnum[2] = {0,0}, maxlev[2];
    int16_t ourbunch[2] = {-1,-1}, osectnum=sectnum;
    int32_t bnchbeg[YAX_MAXDRAWS][2], bnchend[YAX_MAXDRAWS][2];
    int32_t bbeg, numhere;

    // original (1st-draw) and accumulated ('per-level') gotsector bitmaps
    static uint8_t ogotsector[MAXSECTORS>>3], lgotsector[MAXSECTORS>>3];
#ifdef YAX_DEBUG
    uint64_t t;
#endif

    if (getrendermode() == REND_POLYMER || numyaxbunches==0)
    {
#ifdef ENGINE_SCREENSHOT_DEBUG
        engine_screenshot = 0;
#endif
        return;
    }

    // if we're here, there was just a drawrooms() call with g_nodraw=1

    Bmemcpy(ogotsector, gotsector, (numsectors+7)>>3);

    if (sectnum >= 0)
        yax_getbunches(sectnum, &ourbunch[0], &ourbunch[1]);
    Bmemset(&havebunch, 0, (numyaxbunches+7)>>3);

    // first scan all bunches above, then all below...
    for (cf=0; cf<2; cf++)
    {
        yax_globalcf = cf;

        if (cf==1)
        {
            sectnum = osectnum;
            Bmemcpy(gotsector, ogotsector, (numsectors+7)>>3);
        }

        for (lev=0; /*lev<YAX_MAXDRAWS*/; lev++)
        {
            yax_globallev = YAX_MAXDRAWS + (-1 + 2*cf)*(lev+1);

            bbeg = bnchbeg[lev][cf] = bnchend[lev][cf] = bnchnum[cf];
            numhere = 0;

            for (i=0; i<numsectors; i++)
            {
                if (!(gotsector[i>>3]&(1<<(i&7))))
                    continue;

                j = yax_getbunch(i, cf);
                if (j >= 0 && !(havebunch[j>>3]&(1<<(j&7))))
                {
                    if (getrendermode() == REND_CLASSIC && (haveymost[j>>3]&(1<<(j&7)))==0)
                    {
                        yaxdebug("%s, l %d: skipped bunch %d (no *most)", cf?"v":"^", lev, j);
                        continue;
                    }

                    if ((SECTORFLD(i,stat, cf)&2) ||
                            (cf==0 && globalposz > sector[i].ceilingz) ||
                            (cf==1 && globalposz < sector[i].floorz))
                    {
                        havebunch[j>>3] |= (1<<(j&7));
                        bunches[cf][bnchnum[cf]++] = j;
                        bnchend[lev][cf]++;
                        numhere++;
                    }
                }
            }

            if (numhere > 0)
            {
                // found bunches -- need to fake-draw

                yax_scanbunches(bbeg, numhere, (uint8_t *)gotsector);

                qsort(&bunches[cf][bbeg], numhere, sizeof(int16_t), &yax_cmpbunches);

                if (numhere > 1 && lev != YAX_MAXDRAWS-1)
                    Bmemset(lgotsector, 0, (numsectors+7)>>3);

                for (bnchcnt=bbeg; bnchcnt < bbeg+numhere; bnchcnt++)
                {
                    j = bunches[cf][bnchcnt];  // the actual bunchnum...
                    yax_globalbunch = j;
#ifdef YAX_DEBUG
                    t=getu64ticks();
#endif
                    k = bunchsec[j];

                    if (k < 0)
                    {
                        yaxprintf("%s, l %d: skipped bunch %d\n", cf?"v":"^", lev, j);
                        continue;
                    }

                    if (lev != YAX_MAXDRAWS-1)
                    {
#ifdef YAX_DEBUG
                        int32_t odsprcnt = yax_spritesortcnt[yax_globallev];
#endif
                        // +MAXSECTORS: force
                        drawrooms(globalposx,globalposy,globalposz,globalang,horiz,k+MAXSECTORS);
                        if (numhere > 1)
                            for (i=0; i<(numsectors+7)>>3; i++)
                                lgotsector[i] |= gotsector[i];

                        yaxdebug("l%d: faked (bn %2d) sec %4d,%3d dspr, ob=[%2d,%2d], sn=%4d, %.3f ms",
                                 yax_globallev-YAX_MAXDRAWS, j, k, yax_spritesortcnt[yax_globallev]-odsprcnt,
                                 ourbunch[0],ourbunch[1],sectnum,
                                 (double)(1000*(getu64ticks()-t))/u64tickspersec);
                    }

                    if (ourbunch[cf]==j)
                    {
                        ourbunch[cf] = yax_getbunch(k, cf);
                        sectnum = k;
                    }
                }

                if (numhere > 1 && lev != YAX_MAXDRAWS-1)
                    Bmemcpy(gotsector, lgotsector, (numsectors+7)>>3);
            }

            if (numhere==0 || lev==YAX_MAXDRAWS-1)
            {
                // no new bunches or max level reached
                maxlev[cf] = lev - (numhere==0);
                break;
            }
        }
    }

//    yax_globalcf = -1;

    // now comes the real drawing!
    g_nodraw = 0;
    scansector_collectsprites = 0;

    if (editstatus==1 && in3dmode())
    {
        if (getrendermode() == REND_CLASSIC)
        {
            begindrawing();
            draw_rainbow_background();
            enddrawing();
        }
#ifdef USE_OPENGL
        else
        {
            bglClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
        }
#endif
    }

    for (cf=0; cf<2; cf++)
    {
        yax_globalcf = cf;

        for (lev=maxlev[cf]; lev>=0; lev--)
        {
            yax_globallev = YAX_MAXDRAWS + (-1 + 2*cf)*(lev+1);
            scansector_collectsprites = (lev == YAX_MAXDRAWS-1);

            for (bnchcnt=bnchbeg[lev][cf]; bnchcnt<bnchend[lev][cf]; bnchcnt++)
            {
                j = bunches[cf][bnchcnt];  // the actual bunchnum...
                k = bunchsec[j];  // best start-drawing sector
                yax_globalbunch = j;
#ifdef YAX_DEBUG
                t=getu64ticks();
#endif
                yax_tweakpicnums(j, cf, 0);
                if (k < 0)
                    continue;

                yax_nomaskdidit = 0;
                for (nmp=r_tror_nomaskpass; nmp>=0; nmp--)
                {
                    yax_nomaskpass = nmp;
                    drawrooms(globalposx,globalposy,globalposz,globalang,horiz,k+MAXSECTORS);  // +MAXSECTORS: force

                    if (nmp==1)
                    {
                        yaxdebug("nm1 l%d: DRAWN (bn %2d) sec %4d,          %.3f ms",
                                 yax_globallev-YAX_MAXDRAWS, j, k,
                                 (double)(1000*(getu64ticks()-t))/u64tickspersec);

                        if (!yax_nomaskdidit)
                        {
                            yax_nomaskpass = 0;
                            break;  // no need to draw the same stuff twice
                        }
                        Bmemcpy(yax_gotsector, gotsector, (numsectors+7)>>3);
                    }
                }

                if (!scansector_collectsprites)
                    spritesortcnt = 0;
                yax_copytsprites();
                yaxdebug("nm0 l%d: DRAWN (bn %2d) sec %4d,%3d tspr, %.3f ms",
                         yax_globallev-YAX_MAXDRAWS, j, k, spritesortcnt,
                         (double)(1000*(getu64ticks()-t))/u64tickspersec);

                SpriteAnimFunc(globalposx, globalposy, globalang, smoothr);
                drawmasks();
            }

            if (lev < maxlev[cf])
                for (bnchcnt=bnchbeg[lev+1][cf]; bnchcnt<bnchend[lev+1][cf]; bnchcnt++)
                    yax_tweakpicnums(bunches[cf][bnchcnt], cf, 1);  // restore picnums
        }
    }

#ifdef YAX_DEBUG
    t=getu64ticks();
#endif
    yax_globalcf = -1;
    yax_globalbunch = -1;
    yax_globallev = YAX_MAXDRAWS;
    scansector_collectsprites = 0;

    // draw base level
    drawrooms(globalposx,globalposy,globalposz,globalang,horiz,
              osectnum + MAXSECTORS*didmirror);
//    if (scansector_collectsprites)
//        spritesortcnt = 0;
    yax_copytsprites();
    yaxdebug("DRAWN base level sec %d,%3d tspr, %.3f ms", osectnum,
             spritesortcnt, (double)(1000*(getu64ticks()-t))/u64tickspersec);
    scansector_collectsprites = 1;

    for (cf=0; cf<2; cf++)
        if (maxlev[cf] >= 0)
            for (bnchcnt=bnchbeg[0][cf]; bnchcnt<bnchend[0][cf]; bnchcnt++)
                yax_tweakpicnums(bunches[cf][bnchcnt], cf, 1);  // restore picnums

#ifdef ENGINE_SCREENSHOT_DEBUG
    engine_screenshot = 0;
#endif

#ifdef YAX_DEBUG_YMOSTS
    if (getrendermode() == REND_CLASSIC && numyaxbunches>0)
    {
        char purple = getclosestcol(255, 0, 255);
        char yellow = getclosestcol(255, 255, 0);

        begindrawing();
        for (i=0; i<numyaxbunches; i++)
        {
            int32_t x, x1;

            if ((haveymost[i>>3]&(1<<i&7))==0)
                continue;

            x1 = i*xdimen;

            for (x=x1; x<x1+xdimen; x++)
            {
                if (yumost[x] >= 0 && yumost[x] < ydim && (x&1))
                    *((char *)frameplace + yumost[x]*bytesperline + x-x1) = purple;

                if (ydmost[x]-1 >= 0 && ydmost[x]-1 < ydim && !(x&1))
                    *((char *)frameplace + (ydmost[x]-1)*bytesperline + x-x1) = yellow;
            }
        }
        enddrawing();
    }
#endif
}

#endif  // defined YAX_ENABLE

// must have writable frame buffer, i.e. done begindrawing()
static void draw_rainbow_background(void)
{
    int32_t y, i;
    const int32_t N = 240;  // don't use fullbright colors
    const int32_t numfull=bytesperline/N, numrest=bytesperline%N;

    const char *const src = palookup[0] + 256*18;
    char *dst = (char *)frameplace;

    for (y=0; y<ydim; y++)
    {
        for (i=0; i<numfull; i++)
            Bmemcpy(&dst[N*i], src, N);
        if (numrest > 0)
            Bmemcpy(&dst[N*i], src, numrest);

        dst += bytesperline;
    }
}

//
// setslope
//
void setslope(int32_t sectnum, int32_t cf, int16_t slope)
{
    if (slope==0)
    {
        SECTORFLD(sectnum,stat, cf) &= ~2;
        SECTORFLD(sectnum,heinum, cf) = 0;
    }
    else
    {
        SECTORFLD(sectnum,stat, cf) |= 2;
        SECTORFLD(sectnum,heinum, cf) = slope;
    }
}

////////// editor side view //////////
int32_t m32_sideview = 0;
int32_t m32_sideelev = 256;  // elevation in BUILD degrees, 0..512
int16_t m32_sideang = 200;  // azimuth, 0..2047

int32_t m32_sidecos, m32_sidesin;
int32_t m32_swcnt;
int32_t m32_wallscreenxy[MAXWALLS][2];
int16_t m32_wallsprite[MAXWALLS+MAXSPRITES];
static int32_t m32_sidedist[MAXWALLS+MAXSPRITES];
static vec3_t m32_viewplane;


////// sector-like clipping for sprites //////
#ifdef HAVE_CLIPSHAPE_FEATURE
typedef struct
{
    int16_t numsectors, numwalls;
    tsectortype *sector;
    twalltype *wall;
} mapinfo_t;

static void mapinfo_set(mapinfo_t *bak, mapinfo_t *newmap)
{
    if (bak)
    {
        bak->numsectors = numsectors;
        bak->numwalls = numwalls;
        bak->sector = (tsectortype *)sector;
        bak->wall = (twalltype *)wall;
    }

    if (newmap)
    {
        numsectors = newmap->numsectors;
        numwalls = newmap->numwalls;
        sector = (sectortype *)newmap->sector;
        wall = (walltype *)newmap->wall;
    }
}

static mapinfo_t origmapinfo, clipmapinfo;
static int32_t quickloadboard=0;


#define CM_MAX 256  // must be a power of 2

typedef struct
{
    int16_t qbeg, qend;  // indices into sectq
    int16_t picnum, next;
    int32_t maxdist;
} clipinfo_t;

static int32_t numclipmaps;
static clipinfo_t clipinfo[CM_MAX];

static int32_t numclipsects;  // number in sectq[]
static int16_t *sectoidx, *sectq;  // [numsectors]
static int16_t pictoidx[MAXTILES];  // maps tile num to clipinfo[] index
static int16_t *tempictoidx;

static tsectortype *loadsector;
static twalltype *loadwall, *loadwallinv;
static tspritetype *loadsprite;

// sectoidx bits
#undef CM_NONE
#define CM_NONE (CM_MAX<<1)
#define CM_SOME (CM_NONE-1)
#define CM_OUTER (CM_MAX)   // sector surrounds clipping sector

// sprite -> sector tag mappings
#define CM_XREPEAT floorpal
#define CM_YREPEAT floorxpanning
#define CM_XOFFSET ceilingshade
#define CM_YOFFSET floorshade
#define CM_CSTAT hitag
#define CM_ANG extra
#define CM_FLOORZ(Sec) (*(int32_t *)&sector[Sec].ceilingxpanning)  // ceilingxpanning,ceilingypanning,floorpicnum
#define CM_CEILINGZ(Sec) (*(int32_t *)&sector[Sec].visibility)  // visibility,fogpal,lotag

// backup of original normalized coordinates
#define CM_WALL_X(Wal) (*(int32_t *)&wall[Wal].picnum)  // picnum, overpicnum
#define CM_WALL_Y(Wal) (*(int32_t *)&wall[Wal].lotag)  // lotag, hitag

// don't rotate when applying clipping, for models with rotational symmetry
#define CM_NOROT(Spri) (sprite[Spri].cstat&2)
#define CM_NOROTS(Sect) (sector[Sect].CM_CSTAT&2)


static void clipmapinfo_init()
{
    numclipmaps = 0;
    numclipsects = 0;

    DO_FREE_AND_NULL(sectq);
    DO_FREE_AND_NULL(sectoidx);
    DO_FREE_AND_NULL(tempictoidx);
    DO_FREE_AND_NULL(loadsector);
    DO_FREE_AND_NULL(loadwall);
    DO_FREE_AND_NULL(loadwallinv);
    DO_FREE_AND_NULL(loadsprite);

    // two's complement trick, -1 = 0xff
    Bmemset(&pictoidx, -1, sizeof(pictoidx));
    Bmemset(&clipmapinfo, 0, sizeof(mapinfo_t));

    numsectors = 0;
    numwalls = 0;
}

// loads the clip maps.
// this should be called before any real map is loaded.
int32_t clipmapinfo_load(void)
{
    int32_t i,k,w;

    int32_t lwcp = 0;
    int32_t fi;

    int32_t *fisec = NULL;
    int32_t *fispr = NULL;

    int32_t ournumsectors=0, ournumwalls=0, ournumsprites=0;

    clipmapinfo_init();

    loadsector = (tsectortype *)Xmalloc(MAXSECTORS * sizeof(sectortype));
    loadwall = (twalltype *)Xmalloc(MAXWALLS * sizeof(walltype));
    loadsprite = (tspritetype *)Xmalloc(MAXSPRITES * sizeof(spritetype));

    if (g_clipMapFilesNum)
        fisec = (int32_t *)Xcalloc(g_clipMapFilesNum, sizeof (int32_t));
    if (g_clipMapFilesNum)
        fispr = (int32_t *)Xcalloc(g_clipMapFilesNum, sizeof (int32_t));

    quickloadboard = 1;
    for (fi = 0; fi < g_clipMapFilesNum; ++fi)
    {
        int16_t ang,cs;
        vec3_t tmppos;

        fisec[fi] = ournumsectors;
        fispr[fi] = ournumsprites;

        i = loadboard(g_clipMapFiles[fi], 8, &tmppos, &ang, &cs);
        if (i<0)
            continue;
        // Numsprites will now be set!

        initprintf("Loading clip map: %s\n", g_clipMapFiles[fi]);

        if (ournumsectors+numsectors>MAXSECTORS ||
                ournumwalls+numwalls>MAXWALLS ||
                ournumsprites+Numsprites>MAXSPRITES)
        {
            initprintf("clip map: warning: exceeded limits when loading %s, aborting.\n", g_clipMapFiles[fi]);
            break;
        }

        Bmemcpy(loadsector+ournumsectors, sector, numsectors*sizeof(sectortype));
        Bmemcpy(loadwall+ournumwalls, wall, numwalls*sizeof(walltype));
        Bmemcpy(loadsprite+ournumsprites, sprite, Numsprites*sizeof(spritetype));
        for (i=ournumsectors; i<ournumsectors+numsectors; i++)
            loadsector[i].wallptr += ournumwalls;
        for (i=ournumwalls; i<ournumwalls+numwalls; i++)
        {
            if (loadwall[i].point2>=0)
                loadwall[i].point2 += ournumwalls;
            if (loadwall[i].nextwall>=0)
            {
                loadwall[i].nextwall += ournumwalls;
                loadwall[i].nextsector += ournumsectors;
            }
        }
        for (i=ournumsprites; i<ournumsprites+Numsprites; i++)
            if (loadsprite[i].sectnum>=0)
                loadsprite[i].sectnum += ournumsectors;
        ournumsectors += numsectors;
        ournumwalls += numwalls;
        ournumsprites += Numsprites;

        ++lwcp;
    }
    quickloadboard = 0;

    if (ournumsectors==0 || ournumwalls==0 || ournumsprites==0)  // nothing loaded
    {
        clipmapinfo_init();

        Bfree(fisec);
        Bfree(fispr);

        return -1;
    }

    // shrink
    loadsector = (tsectortype *)Xrealloc(loadsector, ournumsectors*sizeof(sectortype));
    loadwall = (twalltype *)Xrealloc(loadwall, ournumwalls*sizeof(walltype));

    Bmemcpy(sector, loadsector, ournumsectors*sizeof(sectortype));
    Bmemcpy(wall, loadwall, ournumwalls*sizeof(walltype));
    Bmemcpy(sprite, loadsprite, ournumsprites*sizeof(spritetype));
    numsectors = ournumsectors;
    numwalls = ournumwalls;

    //  vvvv    don't use headsprite[sect,stat]!   vvvv

    sectoidx = (int16_t *)Xmalloc(numsectors*sizeof(sectoidx[0]));

    for (i=0; i<numsectors; i++)
        sectoidx[i] = CM_NONE;

    // determine outer sectors
    for (i=0; i<numsectors; i++)
    {
        for (w=sector[i].wallptr; w<sector[i].wallptr+sector[i].wallnum; w++)
            if (wall[w].nextsector<0)
            {
                sectoidx[i] = CM_OUTER;
                break;
            }
    }
    // break connections between outer sectors
    for (i=0; i<numsectors; i++)
    {
        if (sectoidx[i] == CM_OUTER)
            for (w=sector[i].wallptr; w<sector[i].wallptr+sector[i].wallnum; w++)
            {
                k = wall[w].nextwall;
                if (k>=0 && sectoidx[wall[w].nextsector]==CM_OUTER)
                {
                    wall[k].nextwall = wall[k].nextsector = -1;
                    wall[w].nextwall = wall[w].nextsector = -1;
                }
            }
    }

    {
        int16_t ns, outersect;
        int32_t pn,scnt, x,y,z, maxdist;

        sectq = (int16_t *)Xmalloc(numsectors*sizeof(sectq[0]));
        tempictoidx = (int16_t *)Xmalloc(MAXTILES*sizeof(tempictoidx[0]));

        for (i=0; i<MAXTILES; i++)
            tempictoidx[i]=-1;

        // collect sprite picnums
        for (i=0; i<MAXSPRITES && sprite[i].statnum<MAXSTATUS; i++)
        {
            pn = sprite[i].picnum;
            k = sprite[i].sectnum;
            //    -v-  note the <=                         ignore sprites in outer sectors
            if (pn<=0 || pn>=MAXTILES || k<0 || k>=numsectors || (sectoidx[k]&CM_OUTER))
                continue;

            if (numclipmaps >= CM_MAX)
            {
                initprintf("warning: reached max clip map number %d, not processing any more\n", CM_MAX);
                break;
            }

            // chain
            if (pictoidx[pn]>=0)
            {
                if (sectoidx[k]&CM_SOME)
                {
                    for (fi = 0; fi < g_clipMapFilesNum; ++fi)
                        if (k>=fisec[fi])
                            break;
                    initprintf("clip map \"%s\": error: tried to chain picnum %d (sprite %d) in sector %d which"
                               " already belongs to picnum %d.\n", g_clipMapFiles[fi], pn, i-fispr[fi], k-fisec[fi],
                               clipinfo[sectoidx[k]].picnum);
                    clipmapinfo_init();

                    Bfree(fisec);
                    Bfree(fispr);

                    return 2;
                }

                // new one is front
                clipinfo[numclipmaps].next = pictoidx[pn];
                pictoidx[pn] = numclipmaps;
            }
            else
            {
                clipinfo[numclipmaps].next = -1;
                pictoidx[pn] = numclipmaps;
            }

            if (!CM_NOROT(i))
            {
                if (sprite[i].ang!=1536 && sprite[i].ang!=512)
                {
                    for (fi = 0; fi < g_clipMapFilesNum; ++fi)
                        if (i>=fispr[fi])
                            break;
                    initprintf("clip map \"%s\": warning: sprite %d pointing neither northward nor southward. %s will be wrong.\n",
                               g_clipMapFiles[fi], i-fispr[fi], (sprite[i].cstat&48)==32 ? "Scaling and flipping" : "X-flipping");
                }
            }

            clipinfo[numclipmaps].picnum = pn;

            // collect sectors
            scnt = numclipsects;
            sectq[numclipsects++] = k;
            sectoidx[k] = numclipmaps;

            clipinfo[numclipmaps].qbeg = scnt;

            outersect = -1;

            do
            {
                k = sectq[scnt];

                for (w=sector[k].wallptr; w<sector[k].wallptr+sector[k].wallnum; w++)
                {
                    ns = wall[w].nextsector;
                    if (ns>=0)
                    {
                        if (sectoidx[ns]==CM_NONE)
                        {
                            sectoidx[ns] = numclipmaps;
                            sectq[numclipsects++] = ns;
                        }
                        else if (sectoidx[ns]&CM_OUTER)
                        {
                            if (outersect>=0 && ns!=outersect)
                            {
                                for (fi = 0; fi < g_clipMapFilesNum; ++fi)
                                    if (ns>=fisec[fi])
                                        break;
                                initprintf("clip map \"%s\": error: encountered more than one outer sector (%d and %d)"
                                           " for sprite %d.\n", g_clipMapFiles[fi], outersect-fisec[fi], ns-fisec[fi], i-fispr[fi]);
                                clipmapinfo_init();

                                Bfree(fisec);
                                Bfree(fispr);

                                return 3;
                            }

                            outersect = ns;
                            sectoidx[outersect] |= numclipmaps;
                        }
                        else if (sectoidx[ns]!=numclipmaps)
                        {
                            for (fi = 0; fi < g_clipMapFilesNum; ++fi)
                                if (ns>=fisec[fi])
                                    break;
                            initprintf("clip map \"%s\": error: encountered sector %d belonging to index %d"
                                       " while collecting sectors for sprite %d (index %d).\n",
                                       g_clipMapFiles[fi], ns-fisec[fi], sectoidx[ns], i-fispr[fi], numclipmaps);
                            clipmapinfo_init();

                            Bfree(fisec);
                            Bfree(fispr);

                            return 4;
                        }
                    }
                }
            }
            while (++scnt < numclipsects);

            if (outersect==-1)
            {
                initprintf("clip map: INTERNAL ERROR: outersect==-1!\n");
                clipmapinfo_init();

                Bfree(fisec);
                Bfree(fispr);

                return 5;
            }

            sectq[numclipsects++] = outersect;  // last is outer
            clipinfo[numclipmaps].qend = numclipsects-1;

            // normalize
            maxdist = 0;

            for (scnt=clipinfo[numclipmaps].qbeg; scnt<=clipinfo[numclipmaps].qend; scnt++)
            {
                k = sectq[scnt];

                x = sprite[i].x;
                y = sprite[i].y;
                z = sprite[i].z;

                sector[k].floorz -= z;
                sector[k].ceilingz -= z;

                if (scnt==clipinfo[numclipmaps].qbeg)
                {
                    // backup sprite tags since we'll discard sprites later
                    sector[k].CM_XREPEAT = sprite[i].xrepeat;
                    sector[k].CM_YREPEAT = sprite[i].yrepeat;
                    sector[k].CM_XOFFSET = sprite[i].xoffset;
                    sector[k].CM_YOFFSET = sprite[i].yoffset;
                    sector[k].CM_CSTAT = sprite[i].cstat;
                    sector[k].CM_ANG = sprite[i].ang;
                }

                // backup floor and ceiling z
                CM_FLOORZ(k) = sector[k].floorz;
                CM_CEILINGZ(k) = sector[k].ceilingz;

                for (w=sector[k].wallptr; w<sector[k].wallptr+sector[k].wallnum; w++)
                {
                    wall[w].x -= x;
                    wall[w].y -= y;

                    if (scnt!=clipinfo[numclipmaps].qend)
                    {
                        if (CM_NOROT(i))
                        {
                            if (klabs(wall[w].x) > maxdist)
                                maxdist = klabs(wall[w].x);
                            if (klabs(wall[w].y) > maxdist)
                                maxdist = klabs(wall[w].y);
                        }
                        else
                        {
                            int32_t tmp = ksqrt(uhypsq(wall[w].x, wall[w].y));
                            if (tmp > maxdist)
                                maxdist = tmp;
                        }
                    }

                    // aliasing
                    if (wall[w].lotag>0 || wall[w].hitag>0)
                    {
                        int32_t ii;

                        if (wall[w].lotag>0 && wall[w].hitag>0)
                        {
                            if (wall[w].lotag > wall[w].hitag)
                                swapshort(&wall[w].lotag, &wall[w].hitag);

                            for (ii=wall[w].lotag; ii<wall[w].hitag; ii++)
                                tempictoidx[ii] = numclipmaps;
                        }
                        else if (wall[w].lotag>0)
                        {
                            if (wall[w].lotag<MAXTILES)
                                tempictoidx[wall[w].lotag] = numclipmaps;
                        }
                        else
                        {
                            if (wall[w].hitag<MAXTILES)
                                tempictoidx[wall[w].hitag] = numclipmaps;
                        }
                    }

                    CM_WALL_X(w) = wall[w].x;
                    CM_WALL_Y(w) = wall[w].y;
                }
            }

            clipinfo[numclipmaps].maxdist = maxdist;
            numclipmaps++;
        }
    }

    // yes, too much copying, but better than ugly code
    Bmemcpy(loadsector, sector, ournumsectors*sizeof(sectortype));
    Bmemcpy(loadwall, wall, ournumwalls*sizeof(walltype));

    // loadwallinv will contain all walls with inverted orientation for x/y-flip handling
    loadwallinv = (twalltype *)Xmalloc(ournumwalls*sizeof(walltype));

    {
        int32_t j, loopstart, loopend, numloopwalls;

        // invert walls!
        loopstart = 0;
        for (j=0; j<ournumwalls; j++)
        {
            wall[j].nextsector = wall[j].nextwall = -1;

            if (wall[j].point2 < j)
            {
                loopend = j+1;
                numloopwalls = loopend-loopstart;

                if (numloopwalls<3)
                {
                    loopstart = loopend;
                    continue;
                }

                for (k=0; k<numloopwalls; k++)
                {
                    wall[loopstart+k].x = loadwall[loopstart + (numloopwalls+1-k)%numloopwalls].x;
                    wall[loopstart+k].y = loadwall[loopstart + (numloopwalls+1-k)%numloopwalls].y;

                    CM_WALL_X(loopstart+k) = wall[loopstart+k].x;
                    CM_WALL_Y(loopstart+k) = wall[loopstart+k].y;
                }

                loopstart = loopend;
            }
        }

        // reconstruct wall connections
        for (i=0; i<ournumsectors; i++)
        {
            for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
                checksectorpointer(j, i);
        }
    }
    Bmemcpy(loadwallinv, wall, ournumwalls*sizeof(walltype));

    clipmapinfo.numsectors = numsectors;
    clipmapinfo.sector = loadsector;
    clipmapinfo.numwalls = numwalls;
    clipmapinfo.wall = loadwall;

    for (i=0; i<MAXTILES; i++)
    {
        if (pictoidx[i]==-1 && tempictoidx[i]>=0)
            pictoidx[i]=tempictoidx[i];
    }

    DO_FREE_AND_NULL(loadsprite);
    DO_FREE_AND_NULL(tempictoidx);

    // don't let other code be distracted by the temporary map we constructed
    numsectors = 0;
    numwalls = 0;
    initspritelists();

    if (lwcp > 0)
        initprintf("Loaded clip map%s.\n", lwcp==1?"":"s");

    Bfree(fisec);
    Bfree(fispr);

    return 0;
}


int32_t clipshape_idx_for_sprite(spritetype *curspr, int32_t curidx)
{
    if (curidx < 0)  // per-sprite init
        curidx = pictoidx[curspr->picnum];
    else
        curidx = clipinfo[curidx].next;

    while (curidx>=0 && (curspr->cstat&32) != (sector[sectq[clipinfo[curidx].qbeg]].CM_CSTAT&32))
        curidx = clipinfo[curidx].next;

    return curidx;
}
#else
int32_t clipshape_idx_for_sprite(spritetype *curspr, int32_t curidx)
{
    UNREFERENCED_PARAMETER(curspr);
    UNREFERENCED_PARAMETER(curidx);
    return -1;
}
#endif  // HAVE_CLIPSHAPE_FEATURE
////// //////

#define WALLS_ARE_CONSISTENT(k) ((wall[k].x == x2 && wall[k].y == y2)   \
                                 && ((wall[wall[k].point2]).x == x1 && (wall[wall[k].point2]).y == y1))

static int32_t getscore(int32_t w1c, int32_t w1f, int32_t w2c, int32_t w2f)
{
    if (w1c > w1f)
        swaplong(&w1c, &w1f);
    if (w2c > w2f)
        swaplong(&w2c, &w2f);

    // now: c <= f for each "wall-vline"

    int32_t maxceil = max(w1c, w2c);
    int32_t minflor = min(w1f, w2f);

    return minflor-maxceil;
}

const int16_t *chsecptr_onextwall = NULL;

int32_t checksectorpointer(int16_t i, int16_t sectnum)
{
    int32_t startsec, endsec;
    int32_t j, k, startwall, endwall, x1, y1, x2, y2, numnewwalls=0;
    int32_t bestnextwall=-1, bestnextsec=-1, bestwallscore=INT32_MIN;
    int32_t cz[4], fz[4], tmp[2], tmpscore=0;
#ifdef YAX_ENABLE
    int16_t cb[2], fb[2];
#endif

#if 0
    if (checksectorpointer_warn && (i<0 || i>=max(numwalls,newnumwalls)))
    {
        char buf[128];
        Bsprintf(buf, "WARN: checksectorpointer called with i=%d but (new)numwalls=%d", i, max(numwalls,newnumwalls));
        OSD_Printf("%s\n", buf);
        printmessage16("%s", buf);
        return 0;
    }
#endif

    x1 = wall[i].x;
    y1 = wall[i].y;
    x2 = (wall[wall[i].point2]).x;
    y2 = (wall[wall[i].point2]).y;

    k = wall[i].nextwall;
    if (k >= 0)          //Check for early exit
    {
        if (WALLS_ARE_CONSISTENT(k))
            return 0;

        wall[k].nextwall = wall[k].nextsector = -1;
    }

    if ((unsigned)wall[i].nextsector < (unsigned)numsectors && wall[i].nextwall < 0)
    {
        // if we have a nextsector but no nextwall, take this as a hint
        // to search only the walls of that sector
        startsec = wall[i].nextsector;
        endsec = startsec+1;
    }
    else
    {
        startsec = 0;
        endsec = numsectors;
    }

    wall[i].nextsector = wall[i].nextwall = -1;

    if (chsecptr_onextwall && (k=chsecptr_onextwall[i])>=0 && wall[k].nextwall<0)
    {
        // old next wall found
        if (WALLS_ARE_CONSISTENT(k))
        {
            j = sectorofwall(k);

            wall[i].nextsector = j;
            wall[i].nextwall = k;
            wall[k].nextsector = sectnum;
            wall[k].nextwall = i;

            return 1;
        }
    }

    for (j=startsec; j<endsec; j++)
    {
        if (j == sectnum)
            continue;

        YAX_SKIPSECTOR(j);

        startwall = sector[j].wallptr;
        endwall = startwall + sector[j].wallnum;
        for (k=startwall; k<endwall; k++)
        {
            if (!WALLS_ARE_CONSISTENT(k))
                continue;

            // Don't create link if the other side is connected to another wall.
            // The nextwall relation should be definitely one-to-one at all times!
            if (wall[k].nextwall>=0 && wall[k].nextwall != i)
                continue;
#ifdef YAX_ENABLE
            yax_getbunches(sectnum, &cb[0], &fb[0]);
            yax_getbunches(j, &cb[1], &fb[1]);

            if ((cb[0]>=0 && cb[0]==cb[1]) || (fb[0]>=0 && fb[0]==fb[1]))
            {
                tmpscore = INT32_MAX;
            }
            else
#endif
            {
                getzsofslope(sectnum, x1,y1, &cz[0],&fz[0]);
                getzsofslope(sectnum, x2,y2, &cz[1],&fz[1]);
                getzsofslope(j, x1,y1, &cz[2],&fz[2]);
                getzsofslope(j, x2,y2, &cz[3],&fz[3]);

                tmp[0] = getscore(cz[0],fz[0], cz[2],fz[2]);
                tmp[1] = getscore(cz[1],fz[1], cz[3],fz[3]);

                if ((tmp[0]^tmp[1]) >= 0)
                    tmpscore = tmp[0]+tmp[1];
                else
                    tmpscore = max(tmp[0], tmp[1]);
            }

            if (bestnextwall == -1 || tmpscore > bestwallscore)
            {
                bestwallscore = tmpscore;
                bestnextwall = k;
                bestnextsec = j;
            }

            numnewwalls++;
        }
    }

    // sectnum -2 means dry run
    if (bestnextwall >= 0 && sectnum!=-2)
#ifdef YAX_ENABLE
        // for walls with TROR neighbors, be conservative in case if score <=0
        // (meaning that no wall area is mutually visible) -- it could be that
        // another sector is a better candidate later on
        if ((yax_getnextwall(i, 0)<0 && yax_getnextwall(i, 1)<0) || bestwallscore>0)
#endif
        {
//    initprintf("w%d new nw=%d (score %d)\n", i, bestnextwall, bestwallscore)
            wall[i].nextsector = bestnextsec;
            wall[i].nextwall = bestnextwall;
            wall[bestnextwall].nextsector = sectnum;
            wall[bestnextwall].nextwall = i;
        }

    return numnewwalls;
}

#undef WALLS_ARE_CONSISTENT


#if defined(_MSC_VER) && !defined(NOASM)

//
// Microsoft C Inline Assembly Routines
//

static inline int32_t nsqrtasm(int32_t a)
{
    _asm
    {
        push ebx
        mov eax, a
        test eax, 0xff000000
        mov ebx, eax
        jnz short over24
        shr ebx, 12
        mov cx, word ptr shlookup[ebx*2]
        jmp short under24
        over24:
        shr ebx, 24
        mov cx, word ptr shlookup[ebx*2+8192]
        under24:
        shr eax, cl
        mov cl, ch
        mov ax, word ptr sqrtable[eax*2]
        shr eax, cl
        pop ebx
    }
}

static inline int32_t msqrtasm(int32_t c)
{
    _asm
    {
        push ebx
        mov ecx, c
        mov eax, 0x40000000
        mov ebx, 0x20000000
        begit:
        cmp ecx, eax
        jl skip
        sub ecx, eax
        lea eax, [eax+ebx*4]
        skip:
        sub eax, ebx
        shr eax, 1
        shr ebx, 2
        jnz begit
        cmp ecx, eax
        sbb eax, -1
        shr eax, 1
        pop ebx
    }
}

static inline int32_t getclipmask(int32_t a, int32_t b, int32_t c, int32_t d)
{
    _asm
    {
        push ebx
        mov eax, a
        mov ebx, b
        mov ecx, c
        mov edx, d
        sar eax, 31
        add ebx, ebx
        adc eax, eax
        add ecx, ecx
        adc eax, eax
        add edx, edx
        adc eax, eax
        mov ebx, eax
        shl ebx, 4
        or al, 0xf0
        xor eax, ebx
        pop ebx
    }
}

static inline int32_t getkensmessagecrc(void *b)
{
    _asm
    {
        push ebx
        mov ebx, b
        xor eax, eax
        mov ecx, 32
        beg:
        mov edx, dword ptr [ebx+ecx*4-4]
        ror edx, cl
        adc eax, edx
        bswap eax
        loop short beg
        pop ebx
    }
}

#elif defined(__GNUC__) && defined(__i386__) && !defined(NOASM)	// _MSC_VER

//
// GCC "Inline" Assembly Routines
//

#define nsqrtasm(a) \
    ({ int32_t __r, __a=(a); \
       __asm__ __volatile__ ( \
        "testl $0xff000000, %%eax\n\t" \
        "movl %%eax, %%ebx\n\t" \
        "jnz 0f\n\t" \
        "shrl $12, %%ebx\n\t" \
        "movw " ASMSYM("shlookup") "(,%%ebx,2), %%cx\n\t" \
        "jmp 1f\n\t" \
        "0:\n\t" \
        "shrl $24, %%ebx\n\t" \
        "movw (" ASMSYM("shlookup") "+8192)(,%%ebx,2), %%cx\n\t" \
        "1:\n\t" \
        "shrl %%cl, %%eax\n\t" \
        "movb %%ch, %%cl\n\t" \
        "movw " ASMSYM("sqrtable") "(,%%eax,2), %%ax\n\t" \
        "shrl %%cl, %%eax" \
        : "=a" (__r) : "a" (__a) : "ebx", "ecx", "cc"); \
     __r; })

// edx is blown by this code somehow?!
#define msqrtasm(c) \
    ({ int32_t __r, __c=(c); \
       __asm__ __volatile__ ( \
        "movl $0x40000000, %%eax\n\t" \
        "movl $0x20000000, %%ebx\n\t" \
        "0:\n\t" \
        "cmpl %%eax, %%ecx\n\t" \
        "jl 1f\n\t" \
        "subl %%eax, %%ecx\n\t" \
        "leal (%%eax,%%ebx,4), %%eax\n\t" \
        "1:\n\t" \
        "subl %%ebx, %%eax\n\t" \
        "shrl $1, %%eax\n\t" \
        "shrl $2, %%ebx\n\t" \
        "jnz 0b\n\t" \
        "cmpl %%eax, %%ecx\n\t" \
        "sbbl $-1, %%eax\n\t" \
        "shrl $1, %%eax" \
        : "=a" (__r) : "c" (__c) : "edx","ebx", "cc"); \
     __r; })

#define getclipmask(a,b,c,d) \
    ({ int32_t __a=(a), __b=(b), __c=(c), __d=(d); \
       __asm__ __volatile__ ("sarl $31, %%eax; addl %%ebx, %%ebx; adcl %%eax, %%eax; " \
                "addl %%ecx, %%ecx; adcl %%eax, %%eax; addl %%edx, %%edx; " \
                "adcl %%eax, %%eax; movl %%eax, %%ebx; shl $4, %%ebx; " \
                "orb $0xf0, %%al; xorl %%ebx, %%eax" \
        : "=a" (__a), "=b" (__b), "=c" (__c), "=d" (__d) \
        : "a" (__a), "b" (__b), "c" (__c), "d" (__d) : "cc"); \
     __a; })


#define getkensmessagecrc(b) \
    ({ int32_t __a, __b=(b); \
       __asm__ __volatile__ ( \
        "xorl %%eax, %%eax\n\t" \
        "movl $32, %%ecx\n\t" \
        "0:\n\t" \
        "movl -4(%%ebx,%%ecx,4), %%edx\n\t" \
        "rorl %%cl, %%edx\n\t" \
        "adcl %%edx, %%eax\n\t" \
        "bswapl %%eax\n\t" \
        "loop 0b" \
        : "=a" (__a) : "b" (__b) : "ecx", "edx" \
     __a; })

#else   // __GNUC__ && __i386__

static inline int32_t nsqrtasm(uint32_t a)
{
    // JBF 20030901: This was a damn lot simpler to reverse engineer than
    // msqrtasm was. Really, it was just like simplifying an algebra equation.
    uint16_t c;

    if (a & 0xff000000)  			// test eax, 0xff000000  /  jnz short over24
    {
        c = shlookup[(a >> 24) + 4096];	// mov ebx, eax
        // over24: shr ebx, 24
        // mov cx, word ptr shlookup[ebx*2+8192]
    }
    else
    {
        c = shlookup[a >> 12];		// mov ebx, eax
        // shr ebx, 12
        // mov cx, word ptr shlookup[ebx*2]
        // jmp short under24
    }
    a >>= c&0xff;				// under24: shr eax, cl
    a = (a&0xffff0000)|(sqrtable[a]);	// mov ax, word ptr sqrtable[eax*2]
    a >>= ((c&0xff00) >> 8);		// mov cl, ch
    // shr eax, cl
    return a;
}

static inline int32_t msqrtasm(uint32_t c)
{
    uint32_t a,b;

    a = 0x40000000l;		// mov eax, 0x40000000
    b = 0x20000000l;		// mov ebx, 0x20000000
    do  				// begit:
    {
        if (c >= a)  		// cmp ecx, eax	 /  jl skip
        {
            c -= a;		// sub ecx, eax
            a += b*4;	// lea eax, [eax+ebx*4]
        }			// skip:
        a -= b;			// sub eax, ebx
        a >>= 1;		// shr eax, 1
        b >>= 2;		// shr ebx, 2
    }
    while (b);			// jnz begit
    if (c >= a)			// cmp ecx, eax
        a++;			// sbb eax, -1
    a >>= 1;			// shr eax, 1
    return a;
}

static inline int32_t getclipmask(int32_t a, int32_t b, int32_t c, int32_t d)
{
    // Ken did this
    d = ((a<0)<<3) + ((b<0)<<2) + ((c<0)<<1) + (d<0);
    return(((d<<4)^0xf0)|d);
}

inline int32_t getkensmessagecrc(int32_t b)
{
    UNREFERENCED_PARAMETER(b);
    return 0x56c764d4l;
}

#endif


int32_t xb1[MAXWALLSB];  // Polymost uses this as a temp array
static int32_t yb1[MAXWALLSB], xb2[MAXWALLSB], yb2[MAXWALLSB];
int32_t rx1[MAXWALLSB], ry1[MAXWALLSB];
static int32_t rx2[MAXWALLSB], ry2[MAXWALLSB];
int16_t bunchp2[MAXWALLSB], thesector[MAXWALLSB];

int16_t bunchfirst[MAXWALLSB], bunchlast[MAXWALLSB];

static int32_t nodesperline, ysavecnt;
static int16_t *smost, *umost, *dmost, *bakumost, *bakdmost;
static int16_t *uplc, *dplc, *uwall, *dwall;
static int32_t *swplc, *lplc, *swall, *lwall;
#ifdef HIGH_PRECISION_SPRITE
static float *swallf;
#endif

static int32_t smostcnt;
static int32_t smoststart[MAXWALLSB];
static char smostwalltype[MAXWALLSB];
static int32_t smostwall[MAXWALLSB], smostwallcnt = -1;

static vec3_t spritesxyz[MAXSPRITESONSCREEN+1];

int32_t xdimen = -1, xdimenrecip, halfxdimen, xdimenscale, xdimscale;
float fxdimen = -1.f;
int32_t ydimen;
static int32_t wx1, wy1, wx2, wy2;
intptr_t frameoffset;

static int32_t nrx1[8], nry1[8], nrx2[8], nry2[8]; // JBF 20031206: Thanks Ken

static int32_t rxi[8], ryi[8], rzi[8], rxi2[8], ryi2[8], rzi2[8];
static int32_t xsi[8], ysi[8], horizycent;
static int32_t *horizlookup=0, *horizlookup2=0;

int32_t globalposx, globalposy, globalposz, globalhoriz;
float fglobalposx, fglobalposy, fglobalposz;
int16_t globalang, globalcursectnum;
int32_t globalpal, cosglobalang, singlobalang;
static int32_t globalblend;
int32_t cosviewingrangeglobalang, sinviewingrangeglobalang;
static char *globalpalwritten;
static int32_t globaluclip, globaldclip;
int32_t globvis, globalvisibility;
int32_t globalhisibility, globalpisibility, globalcisibility;
//char globparaceilclip, globparaflorclip;

int32_t xyaspect;
static int32_t viewingrangerecip;

static char globalxshift, globalyshift;
static int32_t globalxpanning, globalypanning;
int32_t globalshade, globalorientation;
int16_t globalpicnum;
static int16_t globalshiftval;
#ifdef HIGH_PRECISION_SPRITE
static int64_t globalzd;
#else
static int32_t globalzd;
#endif
static int32_t globalyscale;
static int32_t globalxspan, globalyspan, globalispow2=1;  // true if texture has power-of-two x and y size
static intptr_t globalbufplc;

static int32_t globaly1, globalx2;

int16_t sectorborder[256];
int32_t ydim16, qsetmode = 0;
int16_t pointhighlight=-1, linehighlight=-1, highlightcnt=0;
static int32_t *lastx;

int32_t halfxdim16, midydim16;

static int16_t clipnum;
static const int32_t hitscangoalx = (1<<29)-1, hitscangoaly = (1<<29)-1;
#ifdef USE_OPENGL
int32_t hitallsprites = 0;
#endif

typedef struct { int32_t x1, y1, x2, y2; } linetype;
static linetype clipit[MAXCLIPNUM];
static int32_t clipsectnum, origclipsectnum, clipspritenum;
static int16_t clipsectorlist[MAXCLIPNUM], origclipsectorlist[MAXCLIPNUM];
#ifdef HAVE_CLIPSHAPE_FEATURE
static int16_t clipspritelist[MAXCLIPNUM];  // sector-like sprite clipping
#endif
static int16_t clipobjectval[MAXCLIPNUM];

typedef struct
{
    int32_t sx, sy, z;
    int16_t a, picnum;
    int8_t dashade;
    char dapalnum, dastat;
    uint8_t daalpha, dablend;
    char pagesleft;
    int32_t cx1, cy1, cx2, cy2;
    int32_t uniqid;    //JF extension
} permfifotype;
static permfifotype permfifo[MAXPERMS];
static int32_t permhead = 0, permtail = 0;

EDUKE32_STATIC_ASSERT(MAXWALLSB < INT16_MAX);
int16_t numscans, numbunches;
static int16_t numhits;
int16_t capturecount = 0;

uint8_t vgapal16[4*256] =
{
    0,0,0,0, 170,0,0,0, 0,170,0,0, 170,170,0,0, 0,0,170,0,
    170,0,170,0, 0,85,170,0, 170,170,170,0, 85,85,85,0, 255,85,85,0,
    85,255,85,0, 255,255,85,0, 85,85,255,0, 255,85,255,0, 85,255,255,0,
    255,255,255,0
};

int16_t searchit;
int32_t searchx = -1, searchy;                          //search input
int16_t searchsector, searchwall, searchstat;     //search output

// SEARCHBOTTOMWALL:
//   When aiming at a the bottom part of a 2-sided wall whose bottom part
//   is swapped (.cstat&2), searchbottomwall equals that wall's .nextwall. In all
//   other cases (when aiming at a wall), searchbottomwall equals searchwall.
//
// SEARCHISBOTTOM:
//  When aiming at a 2-sided wall, 1 if aiming at the bottom part, 0 else
int16_t searchbottomwall, searchisbottom;

static char artfilename[20];
static char mapartfilename[BMAX_PATH];  // map-specific ART file name
static int32_t mapartfnXXofs;  // byte offset to 'XX' (the number part) in the above
static int32_t artfil = -1, artfilnum, artfilplc;

char inpreparemirror = 0;
static int32_t mirrorsx1, mirrorsy1, mirrorsx2, mirrorsy2;

static int32_t setviewcnt = 0; // interface layers use this now
static int32_t bakframeplace[4], bakxsiz[4], bakysiz[4];
static int32_t bakwindowx1[4], bakwindowy1[4];
static int32_t bakwindowx2[4], bakwindowy2[4];
#ifdef USE_OPENGL
static int32_t bakrendmode;
#endif
static int32_t baktile;

char apptitle[256] = "Build Engine";

uint8_t *basepaltable[MAXBASEPALS] = { palette };
static uint8_t basepalreset=1;
uint8_t curbasepal;

static uint32_t g_lastpalettesum = 0;
palette_t curpalette[256];			// the current palette, unadjusted for brightness or tint
palette_t curpalettefaded[256];		// the current palette, adjusted for brightness and tint (ie. what gets sent to the card)
palette_t palfadergb = { 0,0,0,0 };
char palfadedelta = 0;



//
// Internal Engine Functions
//
#define getblendtab(blend) (blendtable[blend])

static void setpalettefade_calc(uint8_t offset);

void fade_screen_black(int32_t moreopaquep)
{
#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
        fullscreen_tint_gl(0,0,0, moreopaquep ? 168 : 84);
    else
#endif
    {
        Bassert(!offscreenrendering);

        begindrawing();
        {
            char *const p = (char *)frameplace;
            const char *const trans = getblendtab(0);
            const int32_t shiftamnt = ((!!moreopaquep)*8);
            const int32_t dimprod = xdim*ydim;
            int32_t i = 0;

#ifdef CLASSIC_SLICE_BY_4
            for (; i<dimprod-4; i+=4)
            {
                p[i] = trans[p[i]<<shiftamnt];
                p[i+1] = trans[p[i+1]<<shiftamnt];
                p[i+2] = trans[p[i+2]<<shiftamnt];
                p[i+3] = trans[p[i+3]<<shiftamnt];
            }
#endif

            for (; i<dimprod; i++)
                p[i] = trans[p[i]<<shiftamnt];
        }
        enddrawing();
    }
}


// returns: 0=continue sprite collecting;
//          1=break out of sprite collecting;
int32_t engine_addtsprite(int16_t z, int16_t sectnum)
{
    spritetype *spr = &sprite[z];
#ifdef YAX_ENABLE
    if (g_nodraw==0)
    {
        if (numyaxbunches==0)
        {
#endif
            if (spritesortcnt >= MAXSPRITESONSCREEN)
                return 1;

            Bmemcpy(&tsprite[spritesortcnt], spr, sizeof(spritetype));
            tsprite[spritesortcnt].extra = 0;
            tsprite[spritesortcnt++].owner = z;

#ifdef YAX_ENABLE
        }
    }
    else
        if (yax_nomaskpass==0)
    {
        int16_t *sortcnt = &yax_spritesortcnt[yax_globallev];

        if (*sortcnt >= MAXSPRITESONSCREEN)
            return 1;

        yax_tsprite[yax_globallev][*sortcnt] = z;
        if (yax_globalbunch >= 0)
        {
            yax_tsprite[yax_globallev][*sortcnt] |= (MAXSPRITES|(MAXSPRITES<<1));
            yax_tsprfrombunch[yax_globallev][*sortcnt] = yax_globalbunch;
        }
        (*sortcnt)++;

        // now check whether the tsprite needs duplication into another level
        if ((spr->cstat&48)==32)
            return 0;

        int16_t cb, fb;

        yax_getbunches(sectnum, &cb, &fb);
        if (cb < 0 && fb < 0)
            return 0;

        int32_t spheight;
        int16_t spzofs = spriteheightofs(z, &spheight, 1);

        // TODO: get*zofslope?
        if (cb>=0 && spr->z+spzofs-spheight < sector[sectnum].ceilingz)
        {
            sortcnt = &yax_spritesortcnt[yax_globallev-1];
            if (*sortcnt < MAXSPRITESONSCREEN)
            {
                yax_tsprite[yax_globallev-1][*sortcnt] = z|MAXSPRITES;
                (*sortcnt)++;
            }
        }
        if (fb>=0 && spr->z+spzofs > sector[sectnum].floorz)
        {
            sortcnt = &yax_spritesortcnt[yax_globallev+1];
            if (*sortcnt < MAXSPRITESONSCREEN)
            {
                yax_tsprite[yax_globallev+1][*sortcnt] = z|(MAXSPRITES<<1);
                (*sortcnt)++;
            }
        }
    }
#endif

    return 0;
}

static inline vec2_t get_rel_coords(int32_t const x, int32_t const y)
{
    vec2_t const p = {
        dmulscale6(y,cosglobalang, -x,singlobalang),
        dmulscale6(x,cosviewingrangeglobalang, y,sinviewingrangeglobalang)
    };

    return p;
}

// Note: the returned y coordinates are not actually screen coordinates, but
// potentially clipped player-relative y coordinates.
static int get_screen_coords(const vec2_t p1, const vec2_t p2,
                             int32_t *sx1ptr, int32_t *sy1ptr,
                             int32_t *sx2ptr, int32_t *sy2ptr)
{
    int32_t sx1, sy1, sx2, sy2;

    // First point.

    if (p1.x >= -p1.y)
    {
        if (p1.x > p1.y || p1.y == 0)
            return 0;

        sx1 = halfxdimen + scale(p1.x, halfxdimen, p1.y)
            + (p1.x >= 0);  // Fix for SIGNED divide
        if (sx1 >= xdimen)
            sx1 = xdimen-1;

        sy1 = p1.y;
    }
    else
    {
        if (p2.x < -p2.y)
            return 0;

        sx1 = 0;

        int32_t tempint = (p1.x + p1.y) - (p2.x + p2.y);
        if (tempint == 0)
            return 0;
        sy1 = p1.y + scale(p2.y-p1.y, p1.x+p1.y, tempint);
    }

    if (sy1 < 256)
        return 0;

    // Second point.

    if (p2.x <= p2.y)
    {
        if (p2.x < -p2.y || p2.y == 0)
            return 0;

        sx2 = halfxdimen + scale(p2.x,halfxdimen,p2.y) - 1
            + (p2.x >= 0);  // Fix for SIGNED divide
        if (sx2 >= xdimen)
            sx2 = xdimen-1;

        sy2 = p2.y;
    }
    else
    {
        if (p1.x > p1.y)
            return 0;

        sx2 = xdimen-1;

        int32_t tempint = (p1.y - p1.x) + (p2.x - p2.y);
        if (tempint == 0)
            return 0;
        sy2 = p1.y + scale(p2.y-p1.y, p1.y-p1.x, tempint);
    }

    if (sy2 < 256 || sx1 > sx2)
        return 0;

    *sx1ptr = sx1; *sy1ptr = sy1;
    *sx2ptr = sx2; *sy2ptr = sy2;

    return 1;
}

//
// scansector (internal)
//
static void scansector(int16_t startsectnum)
{
    if (startsectnum < 0)
        return;

    sectorborder[0] = startsectnum;
    int32_t sectorbordercnt = 1;

    do
    {
        const int32_t sectnum = sectorborder[--sectorbordercnt];

#ifdef YAX_ENABLE
        if (scansector_collectsprites)
#endif
        for (int32_t i=headspritesect[sectnum]; i>=0; i=nextspritesect[i])
        {
            const spritetype *const spr = &sprite[i];

            if (((spr->cstat & 0x8000) && !showinvisibility) || spr->xrepeat == 0 || spr->yrepeat == 0)
                continue;

            vec2_t const s = { spr->x-globalposx, spr->y-globalposy };

            if ((spr->cstat&48) || ((coord_t)s.x*cosglobalang+(coord_t)s.y*singlobalang > 0))
                if ((spr->cstat&(64+48))!=(64+16) || dmulscale6(sintable[(spr->ang+512)&2047],-s.x, sintable[spr->ang&2047],-s.y) > 0)
                    if (engine_addtsprite(i, sectnum))
                        break;
        }

        gotsector[sectnum>>3] |= pow2char[sectnum&7];

        const int32_t onumbunches = numbunches;
        const int32_t onumscans = numscans;

        const int32_t startwall = sector[sectnum].wallptr;
        const int32_t endwall = startwall + sector[sectnum].wallnum;
        int32_t scanfirst = numscans;

        vec2_t p1, p2 = { 0, 0 };

        for (int32_t w=startwall; w<endwall; w++)
        {
            const walltype *const wal = &wall[w];
            const int32_t nextsectnum = wal->nextsector;
            const walltype *const wal2 = &wall[wal->point2];

            const int32_t x1 = wal->x-globalposx, y1 = wal->y-globalposy;
            const int32_t x2 = wal2->x-globalposx, y2 = wal2->y-globalposy;

            // The following block checks for a potential collection of a
            // sector that is "thin" in screen space. This is necessary because
            // not all sectors that are needed to be drawn may be collected via
            // drawalls() -> scansector() (although those are the majority).
            // Example: standing at exactly the intersection of a large sector
            // into four quadrant sub-sectors.
#if 1
            if (nextsectnum >= 0 && (wal->cstat&32) == 0 && sectorbordercnt < ARRAY_SSIZE(sectorborder))
#ifdef YAX_ENABLE
                if (yax_nomaskpass==0 || !yax_isislandwall(w, !yax_globalcf) || (yax_nomaskdidit=1, 0))
#endif
                if ((gotsector[nextsectnum>>3]&pow2char[nextsectnum&7]) == 0)
                {
                    // OV: E2L10
                    coord_t temp = (coord_t)x1*y2-(coord_t)x2*y1;
                    int32_t tempint = temp;
                    if (((uint64_t)tempint+262144) < 524288)  // BXY_MAX?
                        if (mulscale5(tempint,tempint) <= (x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))
                        {
                            sectorborder[sectorbordercnt++] = nextsectnum;
                            gotsector[nextsectnum>>3] |= pow2char[nextsectnum&7];
                        }
                }
#endif
            p1 = (w == startwall || wall[w - 1].point2 != w) ? get_rel_coords(x1, y1) : p2;
            p2 = get_rel_coords(x2, y2);

            if (p1.y < 256 && p2.y < 256)
                goto skipitaddwall;

            // If wall's NOT facing you
            if (dmulscale32(p1.x, p2.y, -p2.x, p1.y) >= 0)
                goto skipitaddwall;

            if (get_screen_coords(p1, p2, &xb1[numscans], &yb1[numscans], &xb2[numscans], &yb2[numscans]))
            {
                // Made it all the way!
                thesector[numscans] = sectnum; thewall[numscans] = w;
                rx1[numscans] = p1.x; ry1[numscans] = p1.y;
                rx2[numscans] = p2.x; ry2[numscans] = p2.y;
                bunchp2[numscans] = numscans+1;
                numscans++;
            }

skipitaddwall:
            if (wall[w].point2 < w && scanfirst < numscans)
                bunchp2[numscans-1] = scanfirst, scanfirst = numscans;
        }

        for (int32_t s=onumscans; s<numscans; s++)
            if (wall[thewall[s]].point2 != thewall[bunchp2[s]] || xb2[s] >= xb1[bunchp2[s]])
            {
                bunchfirst[numbunches++] = bunchp2[s], bunchp2[s] = -1;
#ifdef YAX_ENABLE
                if (scansector_retfast)
                    return;
#endif
            }

        for (int32_t bn=onumbunches; bn<numbunches; bn++)
        {
            int32_t s;
            for (s=bunchfirst[bn]; bunchp2[s]>=0; s=bunchp2[s])
                /* do nothing */;
            bunchlast[bn] = s;
        }
    }
    while (sectorbordercnt > 0);
}

#if DEBUGGINGAIDS >= 2
// Printing functions for collected scans (called "wall proxies" by
// http://fabiensanglard.net/duke3d/build_engine_internals.php) and
// bunches. For use from within the debugger.

void printscans(void)
{
    static uint8_t didscan[(MAXWALLSB+7)>>3];

    Bmemset(didscan, 0, sizeof(didscan));

    for (int s=0; s<numscans; s++)
    {
        if (bunchp2[s] >= 0 && (didscan[s>>3] & (1<<(s&7)))==0)
        {
            printf("scan ");

            int z = s;
            do
            {
                const int cond = (wall[thewall[z]].point2 != thewall[bunchp2[z]] ||
                                  xb2[z] >= xb1[bunchp2[z]]);

                printf("%s%d(%d) ", cond ? "!" : "", z, thewall[z]);

                if (didscan[z>>3] & (1<<(z&7)))
                {
                    printf("*");
                    break;
                }

                didscan[z>>3] |= (1<<(z&7));
                z = bunchp2[z];
            } while (z >= 0);

            printf("\n");
        }
    }
}

void printbunches(void)
{
    for (int bn=0; bn<numbunches; bn++)
    {
        printf("bunch %d: ", bn);
        for (int s=bunchfirst[bn]; s>=0; s=bunchp2[s])
            printf("%d(%d) ", s, thewall[s]);
        printf("\n");
    }
}
#endif

////////// *WALLSCAN HELPERS //////////

#define WSHELPER_DECL inline //ATTRIBUTE((always_inline))

static WSHELPER_DECL void tweak_tsizes(vec2_t *tsiz)
{
    if (pow2long[picsiz[globalpicnum]&15] == tsiz->x)
        tsiz->x--;
    else
        tsiz->x = -tsiz->x;

    if (pow2long[picsiz[globalpicnum]>>4] == tsiz->y)
        tsiz->y = (picsiz[globalpicnum]>>4);
    else
        tsiz->y = -tsiz->y;
}

static WSHELPER_DECL void calc_bufplc(intptr_t *bufplc, int32_t lw, vec2_t tsiz)
{
    // CAUTION: lw can be negative!
    int32_t i = lw + globalxpanning;

//    if (i >= tsizx)
    {
        if (tsiz.x < 0)
            i = (uint32_t)i % -tsiz.x;
        else
            i &= tsiz.x;
    }

    if (tsiz.y < 0)
        i *= -tsiz.y;
    else
        i <<= tsiz.y;

//    Bassert(i >= 0 && i < tilesiz[globalpicnum].x*tilesiz[globalpicnum].y);

    // Address is at the first row of tile storage (which is column-major).
    *bufplc = waloff[globalpicnum] + i;
}

static WSHELPER_DECL void calc_vplcinc_wall(uint32_t *vplc, int32_t *vinc, inthi_t sw, int32_t y1v)
{
    *vinc = sw*globalyscale;
    *vplc = globalzd + (uint32_t)(*vinc)*(y1v-globalhoriz+1);
}

#ifdef HIGH_PRECISION_SPRITE
static WSHELPER_DECL void calc_vplcinc_sprite(uint32_t *vplc, int32_t *vinc, int32_t x, int32_t y1v)
{
    inthi_t const tmpvinc = Blrintf(swallf[x]);
    inthi_t const tmpvplc = globalzd + tmpvinc*(y1v-globalhoriz+1);

    *vinc = tmpvinc;
    // Clamp the vertical texture coordinate!
    *vplc = min(max(0, tmpvplc), UINT32_MAX);
}
#endif

static int32_t drawing_sprite = 0;

static WSHELPER_DECL void calc_vplcinc(uint32_t *vplc, int32_t *vinc, const int32_t *swal, int32_t x, int32_t y1v)
{
#if !defined HIGH_PRECISION_SPRITE
    (void)drawing_sprite;
#else
    if (drawing_sprite)
        calc_vplcinc_sprite(vplc, vinc, x, y1v);
    else
#endif
        calc_vplcinc_wall(vplc, vinc, swal[x], y1v);
}

#undef NONPOW2_YSIZE_ASM
#if !defined ENGINE_USING_A_C
# if defined CLASSIC_NONPOW2_YSIZE_WALLS || defined CLASSIC_NONPOW2_YSIZE_SPRITES
#  define NONPOW2_YSIZE_ASM
# endif
#endif


//
// maskwallscan (internal)
//
static void maskwallscan(int32_t x1, int32_t x2, int32_t saturatevplc)
{
    if (globalshiftval < 0) return;
    if ((uwall[x1] > ydimen) && (uwall[x2] > ydimen)) return;
    if ((dwall[x1] < 0) && (dwall[x2] < 0)) return;

    vec2_t tsiz = tilesiz[globalpicnum];
    if ((tsiz.x <= 0) || (tsiz.y <= 0)) return;

    setgotpic(globalpicnum);

    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);

    tweak_tsizes(&tsiz);

    if (EDUKE32_PREDICT_FALSE(palookup[globalpal] == NULL))
        globalpal = 0;

    intptr_t const fpalookup = FP_OFF(palookup[globalpal]);

    setupmvlineasm(globalshiftval, saturatevplc);

    int32_t x = x1;
    while ((x <= x2) && (startumost[x+windowx1] > startdmost[x+windowx1]))
        x++;

    intptr_t p = x+frameoffset;

    int32_t y1ve[4], y2ve[4];

#ifdef NONPOW2_YSIZE_ASM
    if (globalshiftval==0)
        goto do_mvlineasm1;
#endif

#ifdef MULTI_COLUMN_VLINE
    for (; (x<=x2)&&(p&3); x++,p++)
    {
        y1ve[0] = max(uwall[x],startumost[x+windowx1]-windowy1);
        y2ve[0] = min(dwall[x],startdmost[x+windowx1]-windowy1);
        if (y2ve[0] <= y1ve[0]) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swall[x],globvis));

        calc_bufplc(&bufplce[0], lwall[x], tsiz);
        calc_vplcinc(&vplce[0], &vince[0], swall, x, y1ve[0]);

        mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],p+ylookup[y1ve[0]]);
    }
    for (; x<=x2-3; x+=4,p+=4)
    {
        char bad = 0;

        for (int z=3,dax=x+3; z>=0; z--,dax--)
        {
            y1ve[z] = max(uwall[dax],startumost[dax+windowx1]-windowy1);
            y2ve[z] = min(dwall[dax],startdmost[dax+windowx1]-windowy1)-1;
            if (y2ve[z] < y1ve[z]) { bad += pow2char[z]; continue; }

            calc_bufplc(&bufplce[z], lwall[dax], tsiz);
            calc_vplcinc(&vplce[z], &vince[z], swall, dax, y1ve[z]);
        }
        if (bad == 15) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swall[x],globvis));
        palookupoffse[3] = fpalookup + getpalookupsh(mulscale16(swall[x+3],globvis));

        if ((palookupoffse[0] == palookupoffse[3]) && ((bad&0x9) == 0))
        {
            palookupoffse[1] = palookupoffse[0];
            palookupoffse[2] = palookupoffse[0];
        }
        else
        {
            palookupoffse[1] = fpalookup + getpalookupsh(mulscale16(swall[x+1],globvis));
            palookupoffse[2] = fpalookup + getpalookupsh(mulscale16(swall[x+2],globvis));
        }

        int32_t const u4 = max(max(y1ve[0],y1ve[1]),max(y1ve[2],y1ve[3]));
        int32_t const d4 = min(min(y2ve[0],y2ve[1]),min(y2ve[2],y2ve[3]));

        if ((bad > 0) || (u4 >= d4))
        {
            if (!(bad&1)) mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0],vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
            if (!(bad&2)) mvlineasm1(vince[1],palookupoffse[1],y2ve[1]-y1ve[1],vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
            if (!(bad&4)) mvlineasm1(vince[2],palookupoffse[2],y2ve[2]-y1ve[2],vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
            if (!(bad&8)) mvlineasm1(vince[3],palookupoffse[3],y2ve[3]-y1ve[3],vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);
            continue;
        }

        if (u4 > y1ve[0]) vplce[0] = mvlineasm1(vince[0],palookupoffse[0],u4-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
        if (u4 > y1ve[1]) vplce[1] = mvlineasm1(vince[1],palookupoffse[1],u4-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
        if (u4 > y1ve[2]) vplce[2] = mvlineasm1(vince[2],palookupoffse[2],u4-y1ve[2]-1,vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
        if (u4 > y1ve[3]) vplce[3] = mvlineasm1(vince[3],palookupoffse[3],u4-y1ve[3]-1,vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);

        if (d4 >= u4) mvlineasm4(d4-u4+1, (char *)(ylookup[u4]+p));

        intptr_t const pp = p+ylookup[d4+1];

        if (y2ve[0] > d4) mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-d4-1,vplce[0],bufplce[0],pp+0);
        if (y2ve[1] > d4) mvlineasm1(vince[1],palookupoffse[1],y2ve[1]-d4-1,vplce[1],bufplce[1],pp+1);
        if (y2ve[2] > d4) mvlineasm1(vince[2],palookupoffse[2],y2ve[2]-d4-1,vplce[2],bufplce[2],pp+2);
        if (y2ve[3] > d4) mvlineasm1(vince[3],palookupoffse[3],y2ve[3]-d4-1,vplce[3],bufplce[3],pp+3);
    }
#endif

#ifdef NONPOW2_YSIZE_ASM
do_mvlineasm1:
#endif
    for (; x<=x2; x++,p++)
    {
        y1ve[0] = max(uwall[x],startumost[x+windowx1]-windowy1);
        y2ve[0] = min(dwall[x],startdmost[x+windowx1]-windowy1);
        if (y2ve[0] <= y1ve[0]) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swall[x],globvis));

        calc_bufplc(&bufplce[0], lwall[x], tsiz);
        calc_vplcinc(&vplce[0], &vince[0], swall, x, y1ve[0]);

#ifdef NONPOW2_YSIZE_ASM
        if (globalshiftval==0)
            mvlineasm1nonpow2(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],p+ylookup[y1ve[0]]);
        else
#endif
        mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],p+ylookup[y1ve[0]]);
    }

    faketimerhandler();
}


//
// wallfront (internal)
//
int32_t wallfront(int32_t l1, int32_t l2)
{
    vec2_t const l1vect   = *(vec2_t *)&wall[thewall[l1]];
    vec2_t const l1p2vect = *(vec2_t *)&wall[wall[thewall[l1]].point2];
    vec2_t const l2vect   = *(vec2_t *)&wall[thewall[l2]];
    vec2_t const l2p2vect = *(vec2_t *)&wall[wall[thewall[l2]].point2];
    vec2_t d = { l1p2vect.x - l1vect.x, l1p2vect.y - l1vect.y };
    int32_t t1 = dmulscale2(l2vect.x-l1vect.x, d.y, -d.x, l2vect.y-l1vect.y); //p1(l2) vs. l1
    int32_t t2 = dmulscale2(l2p2vect.x-l1vect.x, d.y, -d.x, l2p2vect.y-l1vect.y); //p2(l2) vs. l1

    if (t1 == 0) { if (t2 == 0) return -1; t1 = t2; }
    if (t2 == 0) t2 = t1;

    if ((t1^t2) >= 0) //pos vs. l1
        return (dmulscale2(globalposx-l1vect.x, d.y, -d.x, globalposy-l1vect.y) ^ t1) >= 0;

    d.x = l2p2vect.x-l2vect.x;
    d.y = l2p2vect.y-l2vect.y;

    t1 = dmulscale2(l1vect.x-l2vect.x, d.y, -d.x, l1vect.y-l2vect.y); //p1(l1) vs. l2
    t2 = dmulscale2(l1p2vect.x-l2vect.x, d.y, -d.x, l1p2vect.y-l2vect.y); //p2(l1) vs. l2

    if (t1 == 0) { if (t2 == 0) return -1; t1 = t2; }
    if (t2 == 0) t2 = t1;

    if ((t1^t2) >= 0) //pos vs. l2
        return (dmulscale2(globalposx-l2vect.x,d.y,-d.x,globalposy-l2vect.y) ^ t1) < 0;

    return -2;
}

//
// spritewallfront (internal)
//
static inline int32_t spritewallfront(const tspritetype *s, int32_t w)
{
    const twalltype *const wal = (twalltype *)&wall[w];
    const twalltype *wal2 = (twalltype *)&wall[wal->point2];
    const vec2_t v = { wal->x, wal->y };

    return dmulscale32(wal2->x - v.x, s->y - v.y, -(s->x - v.x), wal2->y - v.y) >= 0;
}

//
//  spritebehindwall(internal)
//
#if 0
static int32_t spriteobstructswall(spritetype *s, int32_t w)
{
    walltype *wal;
    int32_t x, y;
    int32_t x1, y1;
    int32_t x2, y2;
    double a1, b1, c1;
    double a2, b2, c2;
    double d1, d2;

    // wall line equation
    wal = &wall[w]; x1 = wal->x - globalposx; y1 = wal->y - globalposy;
    wal = &wall[wal->point2]; x2 = wal->x - globalposx; y2 = wal->y - globalposy;
    if ((x2 - x1) != 0)
        a1 = (float)(y2 - y1)/(x2 - x1);
    else
        a1 = 1e+37; // not infinite, but almost ;)
    b1 = -1;
    c1 = (y1 - (a1 * x1));

    // player to sprite line equation
    if ((s->x - globalposx) != 0)
        a2 = (float)(s->y - globalposy)/(s->x - globalposx);
    else
        a2 = 1e+37;
    b2 = -1;
    c2 = 0;

    // intersection point
    d1 = (float)(1) / (a1*b2 - a2*b1);
    x = ((b1*c2 - b2*c1) * d1);
    y = ((a2*c1 - a1*c2) * d1);

    // distance between the sprite and the player
    a1 = s->x - globalposx;
    b1 = s->y - globalposy;
    d1 = (a1 * a1 + b1 * b1);

    // distance between the intersection point and the player
    d2 = (x * x + y * y);

    // check if the sprite obstructs the wall
    if ((d1 < d2) && (min(x1, x2) <= x) && (x <= max(x1, x2)) && (min(y1, y2) <= y) && (y <= max(y1, y2)))
        return (1);
    else
        return (0);
}
#endif
//
// bunchfront (internal)
//
static inline int32_t bunchfront(int32_t b1, int32_t b2)
{
    int b1f = bunchfirst[b1];
    int const x1b1 = xb1[b1f];
    int const x2b2 = xb2[bunchlast[b2]] + 1;

    if (x1b1 >= x2b2)
        return (-1);

    int b2f = bunchfirst[b2];
    int const x1b2 = xb1[b2f];
    int const x2b1 = xb2[bunchlast[b1]] + 1;

    if (x1b2 >= x2b1)
        return (-1);

    if (x1b1 >= x1b2)
    {
        for (; xb2[b2f] < x1b1; b2f = bunchp2[b2f]) { }
        return wallfront(b1f, b2f);
    }

    for (; xb2[b1f] < x1b2; b1f = bunchp2[b1f]) { }
    return wallfront(b1f, b2f);
}


//
// hline (internal)
//
static inline void hline(int32_t xr, int32_t yp)
{
    int32_t const xl = lastx[yp];
    if (xl > xr) return;
    int32_t const r = horizlookup2[yp-globalhoriz+horizycent];
    asm1 = (inthi_t)globalx1*r;
    asm2 = (inthi_t)globaly2*r;
    int32_t const s = getpalookupsh(mulscale16(r,globvis));

    hlineasm4(xr-xl,0,s,(uint32_t)globalx2*r+globalypanning,(uint32_t)globaly1*r+globalxpanning,
              ylookup[yp]+xr+frameoffset);
}


//
// slowhline (internal)
//
static inline void slowhline(int32_t xr, int32_t yp)
{
    int32_t const xl = lastx[yp]; if (xl > xr) return;
    int32_t const r = horizlookup2[yp-globalhoriz+horizycent];
    asm1 = (inthi_t)globalx1*r;
    asm2 = (inthi_t)globaly2*r;

    asm3 = (intptr_t)globalpalwritten + getpalookupsh(mulscale16(r,globvis));
    if (!(globalorientation&256))
    {
        mhline(globalbufplc,(uint32_t)globaly1*r+globalxpanning-asm1*(xr-xl),(xr-xl)<<16,0L,
               (uint32_t)globalx2*r+globalypanning-asm2*(xr-xl),ylookup[yp]+xl+frameoffset);
        return;
    }
    thline(globalbufplc,(uint32_t)globaly1*r+globalxpanning-asm1*(xr-xl),(xr-xl)<<16,0L,
           (uint32_t)globalx2*r+globalypanning-asm2*(xr-xl),ylookup[yp]+xl+frameoffset);
}


//
// prepwall (internal)
//
static void prepwall(int32_t z, const walltype *wal)
{
    int32_t l=0, ol=0, x;

    int32_t walxrepeat = (wal->xrepeat<<3);

    //lwall calculation
    int32_t tmpx = xb1[z]-halfxdimen;

    const int32_t topinc = -(ry1[z]>>2);
    const int32_t botinc = (ry2[z]-ry1[z])>>8;
    int32_t top = mulscale5(rx1[z],xdimen) + mulscale2(topinc,tmpx);
    int32_t bot = mulscale11(rx1[z]-rx2[z],xdimen) + mulscale2(botinc,tmpx);

    const int32_t splc = mulscale19(ry1[z],xdimscale);
    const int32_t sinc = mulscale16(ry2[z]-ry1[z],xdimscale);

    x = xb1[z];
    if (bot != 0)
    {
        l = divscale12(top,bot);
        swall[x] = mulscale21(l,sinc)+splc;
        l *= walxrepeat;
        lwall[x] = (l>>18);
    }
    while (x+4 <= xb2[z])
    {
        int32_t i;

        top += topinc; bot += botinc;
        if (bot != 0)
        {
            ol = l; l = divscale12(top,bot);
            swall[x+4] = mulscale21(l,sinc)+splc;
            l *= walxrepeat;
            lwall[x+4] = (l>>18);
        }

        i = (ol+l)>>1;

        lwall[x+2] = i>>18;
        lwall[x+1] = (ol+i)>>19;
        lwall[x+3] = (l+i)>>19;

        swall[x+2] = (swall[x]+swall[x+4])>>1;
        swall[x+1] = (swall[x]+swall[x+2])>>1;
        swall[x+3] = (swall[x+4]+swall[x+2])>>1;

        x += 4;
    }
    if (x+2 <= xb2[z])
    {
        top += (topinc>>1); bot += (botinc>>1);
        if (bot != 0)
        {
            ol = l; l = divscale12(top,bot);
            swall[x+2] = mulscale21(l,sinc)+splc;
            l *= walxrepeat;
            lwall[x+2] = (l>>18);
        }
        lwall[x+1] = (l+ol)>>19;
        swall[x+1] = (swall[x]+swall[x+2])>>1;
        x += 2;
    }
    if (x+1 <= xb2[z])
    {
        bot += (botinc>>2);
        if (bot != 0)
        {
            l = divscale12(top+(topinc>>2),bot);
            swall[x+1] = mulscale21(l,sinc)+splc;
            lwall[x+1] = mulscale18(l,walxrepeat);
        }
    }

    if (lwall[xb1[z]] < 0)
        lwall[xb1[z]] = 0;
    if (lwall[xb2[z]] >= walxrepeat && walxrepeat)
        lwall[xb2[z]] = walxrepeat-1;

    if (wal->cstat&8)
    {
        walxrepeat--;
        for (x=xb1[z]; x<=xb2[z]; x++)
            lwall[x] = walxrepeat-lwall[x];
    }
}


//
// animateoffs (internal)
//
#ifdef DEBUGGINGAIDS
int32_t animateoffs(int const tilenum, int fakevar)
#else
int32_t animateoffs(int const tilenum)
#endif
{
#ifdef DEBUGGINGAIDS
    UNREFERENCED_PARAMETER(fakevar);
#endif

    int const animnum = picanm[tilenum].num;

    if (animnum <= 0)
        return 0;

    int const i = totalclocklock >> (picanm[tilenum].sf & PICANM_ANIMSPEED_MASK);
    int offs = 0;

    switch (picanm[tilenum].sf & PICANM_ANIMTYPE_MASK)
    {
        case PICANM_ANIMTYPE_OSC:
        {
            int k = (i % (animnum << 1));
            offs = (k < animnum) ? k : (animnum << 1) - k;
        }
        break;
        case PICANM_ANIMTYPE_FWD: offs = i % (animnum + 1); break;
        case PICANM_ANIMTYPE_BACK: offs = -(i % (animnum + 1)); break;
    }

    return offs;
}


static inline void wallmosts_finish(int16_t *mostbuf, int32_t z1, int32_t z2,
                                    int32_t ix1, int32_t iy1, int32_t ix2, int32_t iy2)
{
    const int32_t y = scale(z1, xdimenscale, iy1)<<4;

#if 0
    // enable for paranoia:
    ix1 = clamp(ix1, 0, xres-1);
    ix2 = clamp(ix2, 0, xres-1);
    if (ix2-ix1 < 0)
        swaplong(&ix1, &ix2);
#endif
    // PK 20110423: a bit consistency checking is a good thing:
    int32_t const tmp = (ix2 - ix1 >= 0) ? (ix2 - ix1 + 1) : 1;
    int32_t const yinc = tabledivide32((scale(z2, xdimenscale, iy2) << 4) - y, tmp);

    qinterpolatedown16short((intptr_t)&mostbuf[ix1], tmp, y + (globalhoriz << 16), yinc);

    mostbuf[ix1] = clamp(mostbuf[ix1], 0, ydimen);
    mostbuf[ix2] = clamp(mostbuf[ix2], 0, ydimen);
}

#ifdef CLASSIC_Z_DIFF_64
typedef int64_t zint_t;

// For drawvox()
static inline zint_t mulscale16z(int32_t a, int32_t d)
{
    return ((zint_t)a * d)>>16;
}

static inline zint_t mulscale20z(int32_t a, int32_t d)
{
    return ((zint_t)a * d)>>20;
}

static inline zint_t dmulscale24z(int32_t a, int32_t d, int32_t S, int32_t D)
{
    return (((zint_t)a * d) + ((zint_t)S * D)) >> 24;
}
#else
typedef int32_t zint_t;
# define mulscale16z mulscale16
# define mulscale20z mulscale20
# define dmulscale24z dmulscale24
#endif

//
// owallmost (internal)
//
static int32_t owallmost(int16_t *mostbuf, int32_t w, zint_t z)
{
    z <<= 7;
    const zint_t s1 = mulscale20z(globaluclip,yb1[w]), s2 = mulscale20z(globaluclip,yb2[w]);
    const zint_t s3 = mulscale20z(globaldclip,yb1[w]), s4 = mulscale20z(globaldclip,yb2[w]);
    const int32_t bad = (z<s1)+((z<s2)<<1)+((z>s3)<<2)+((z>s4)<<3);

    int32_t ix1 = xb1[w], iy1 = yb1[w];
    int32_t ix2 = xb2[w], iy2 = yb2[w];

    if ((bad&3) == 3)
    {
        for (int i=ix1; i<=ix2; i++)
            mostbuf[i] = 0;
        return bad;
    }

    if ((bad&12) == 12)
    {
        for (int i=ix1; i<=ix2; i++)
            mostbuf[i] = ydimen;
        return bad;
    }

    if (bad&3)
    {
        int32_t t = divscale30(z-s1,s2-s1);
        int32_t inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        int32_t xcross = xb1[w] + scale(mulscale30(yb2[w],t),xb2[w]-xb1[w],inty);

        if ((bad&3) == 2)
        {
            if (xb1[w] <= xcross) { iy2 = inty; ix2 = xcross; }
            for (int i=xcross+1; i<=xb2[w]; i++)
                mostbuf[i] = 0;
        }
        else
        {
            if (xcross <= xb2[w]) { iy1 = inty; ix1 = xcross; }
            for (int i=xb1[w]; i<=xcross; i++)
                mostbuf[i] = 0;
        }
    }

    if (bad&12)
    {
        int32_t t = divscale30(z-s3,s4-s3);
        int32_t inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        int32_t xcross = xb1[w] + scale(mulscale30(yb2[w],t),xb2[w]-xb1[w],inty);

        if ((bad&12) == 8)
        {
            if (xb1[w] <= xcross) { iy2 = inty; ix2 = xcross; }
            for (int i=xcross+1; i<=xb2[w]; i++)
                mostbuf[i] = ydimen;
        }
        else
        {
            if (xcross <= xb2[w]) { iy1 = inty; ix1 = xcross; }
            for (int i=xb1[w]; i<=xcross; i++)
                mostbuf[i] = ydimen;
        }
    }

    wallmosts_finish(mostbuf, z, z, ix1, iy1, ix2, iy2);

    return bad;
}

static inline zint_t wallmost_getz(int32_t fw, int32_t t, zint_t z,
                                   int32_t x1, int32_t y1, int32_t x2, int32_t y2,
                                   int32_t xv, int32_t yv, int32_t dx, int32_t dy)
{
    // XXX: OVERFLOW with huge sectors and sloped ceilngs/floors!
    int32_t i = xv*(y1-globalposy) - yv*(x1-globalposx);
    const int32_t j = yv*x2 - xv*y2;

    if (klabs(j) > klabs(i>>3))
        i = divscale28(i,j);

    return dmulscale24z(dx*t, mulscale20z(y2,i)+((y1-wall[fw].y)<<8),
                        -dy*t, mulscale20z(x2,i)+((x1-wall[fw].x)<<8)) + ((z-globalposz)<<7);
}

//
// wallmost (internal)
//
static int32_t wallmost(int16_t *mostbuf, int32_t w, int32_t sectnum, char dastat)
{
    int32_t t, z;
    int32_t xv, yv;

    if (dastat == 0)
    {
        z = sector[sectnum].ceilingz-globalposz;
        if ((sector[sectnum].ceilingstat&2) == 0)
            return owallmost(mostbuf,w,z);
    }
    else
    {
        z = sector[sectnum].floorz-globalposz;
        if ((sector[sectnum].floorstat&2) == 0)
            return owallmost(mostbuf,w,z);
    }

    const int wi = thewall[w];
    if (wi == sector[sectnum].wallptr)
        return owallmost(mostbuf,w,z);

    const walltype *const wal = &wall[wi];
    const int32_t x1 = wal->x, x2 = wall[wal->point2].x-x1;
    const int32_t y1 = wal->y, y2 = wall[wal->point2].y-y1;

    const int w1 = sector[sectnum].wallptr, w2 = wall[w1].point2;
    const int32_t dx = wall[w2].x-wall[w1].x, dy = wall[w2].y-wall[w1].y;
    const int32_t dasqr = krecipasm(nsqrtasm(uhypsq(dx,dy)));

    if (dastat == 0)
    {
        t = mulscale15(sector[sectnum].ceilingheinum, dasqr);
        z = sector[sectnum].ceilingz;
    }
    else
    {
        t = mulscale15(sector[sectnum].floorheinum,dasqr);
        z = sector[sectnum].floorz;
    }


    if (xb1[w] == 0)
        { xv = cosglobalang+sinviewingrangeglobalang; yv = singlobalang-cosviewingrangeglobalang; }
    else
        { xv = x1-globalposx; yv = y1-globalposy; }
    zint_t z1 = wallmost_getz(w1, t, z, x1, y1, x2, y2, xv, yv, dx, dy);


    if (xb2[w] == xdimen-1)
        { xv = cosglobalang-sinviewingrangeglobalang; yv = singlobalang+cosviewingrangeglobalang; }
    else
        { xv = (x2+x1)-globalposx; yv = (y2+y1)-globalposy; }
    zint_t z2 = wallmost_getz(w1, t, z, x1, y1, x2, y2, xv, yv, dx, dy);


    const zint_t s1 = mulscale20(globaluclip,yb1[w]), s2 = mulscale20(globaluclip,yb2[w]);
    const zint_t s3 = mulscale20(globaldclip,yb1[w]), s4 = mulscale20(globaldclip,yb2[w]);
    const int32_t bad = (z1<s1)+((z2<s2)<<1)+((z1>s3)<<2)+((z2>s4)<<3);

    int32_t ix1 = xb1[w], ix2 = xb2[w];
    int32_t iy1 = yb1[w], iy2 = yb2[w];

    if ((bad&3) == 3)
    {
        for (int i=ix1; i<=ix2; i++)
            mostbuf[i] = 0;
        return bad;
    }

    if ((bad&12) == 12)
    {
        for (int i=ix1; i<=ix2; i++)
            mostbuf[i] = ydimen;
        return bad;
    }

    const int32_t oz1 = z1, oz2 = z2;

    if (bad&3)
    {
        //inty = intz / (globaluclip>>16)
        t = divscale30(oz1-s1,s2-s1+oz1-oz2);
        int32_t inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        int32_t intz = oz1 + mulscale30(oz2-oz1,t);
        int32_t xcross = xb1[w] + scale(mulscale30(yb2[w],t),xb2[w]-xb1[w],inty);

        //t = divscale30((x1<<4)-xcross*yb1[w],xcross*(yb2[w]-yb1[w])-((x2-x1)<<4));
        //inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        //intz = z1 + mulscale30(z2-z1,t);

        if ((bad&3) == 2)
        {
            if (xb1[w] <= xcross) { z2 = intz; iy2 = inty; ix2 = xcross; }
            for (int i=xcross+1; i<=xb2[w]; i++)
                mostbuf[i] = 0;
        }
        else
        {
            if (xcross <= xb2[w]) { z1 = intz; iy1 = inty; ix1 = xcross; }
            for (int i=xb1[w]; i<=xcross; i++)
                mostbuf[i] = 0;
        }
    }

    if (bad&12)
    {
        //inty = intz / (globaldclip>>16)
        t = divscale30(oz1-s3,s4-s3+oz1-oz2);
        int32_t inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        int32_t intz = oz1 + mulscale30(oz2-oz1,t);
        int32_t xcross = xb1[w] + scale(mulscale30(yb2[w],t),xb2[w]-xb1[w],inty);

        //t = divscale30((x1<<4)-xcross*yb1[w],xcross*(yb2[w]-yb1[w])-((x2-x1)<<4));
        //inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        //intz = z1 + mulscale30(z2-z1,t);

        if ((bad&12) == 8)
        {
            if (xb1[w] <= xcross) { z2 = intz; iy2 = inty; ix2 = xcross; }
            for (int i=xcross+1; i<=xb2[w]; i++)
                mostbuf[i] = ydimen;
        }
        else
        {
            if (xcross <= xb2[w]) { z1 = intz; iy1 = inty; ix1 = xcross; }
            for (int i=xb1[w]; i<=xcross; i++)
                mostbuf[i] = ydimen;
        }
    }

    wallmosts_finish(mostbuf, z1, z2, ix1, iy1, ix2, iy2);

    return bad;
}


// globalpicnum --> globalxshift, globalyshift
static void calc_globalshifts(void)
{
    globalxshift = (8-(picsiz[globalpicnum]&15));
    globalyshift = (8-(picsiz[globalpicnum]>>4));
    if (globalorientation&8) { globalxshift++; globalyshift++; }
    // PK: the following can happen for large (>= 512) tile sizes.
    // NOTE that global[xy]shift are unsigned chars.
    if (globalxshift > 31) globalxshift=0;
    if (globalyshift > 31) globalyshift=0;
}

static int32_t setup_globals_cf1(const sectortype *sec, int32_t pal, int32_t zd,
                                 int32_t picnum, int32_t shade, int32_t stat,
                                 int32_t xpanning, int32_t ypanning, int32_t x1)
{
    int32_t i, j, ox, oy;

    if (palookup[pal] != globalpalwritten)
    {
        globalpalwritten = palookup[pal];
        if (!globalpalwritten) globalpalwritten = palookup[globalpal];  // JBF: fixes null-pointer crash
        setpalookupaddress(globalpalwritten);
    }

    globalzd = zd;
    if (globalzd > 0) return 1;

    globalpicnum = picnum;
    if ((unsigned)globalpicnum >= MAXTILES) globalpicnum = 0;
    setgotpic(globalpicnum);
    if ((tilesiz[globalpicnum].x <= 0) || (tilesiz[globalpicnum].y <= 0)) return 1;
    DO_TILE_ANIM(globalpicnum, 0);

    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);
    globalbufplc = waloff[globalpicnum];

    globalshade = shade;
    globvis = globalcisibility;
    if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));
    globalorientation = stat;

    if ((globalorientation&64) == 0)
    {
        globalx1 = singlobalang; globalx2 = singlobalang;
        globaly1 = cosglobalang; globaly2 = cosglobalang;
        globalxpanning = ((inthi_t)globalposx<<20);
        globalypanning = -((inthi_t)globalposy<<20);
    }
    else
    {
        j = sec->wallptr;
        ox = wall[wall[j].point2].x - wall[j].x;
        oy = wall[wall[j].point2].y - wall[j].y;
        i = nsqrtasm(uhypsq(ox,oy)); if (i == 0) i = 1024; else i = tabledivide32(1048576, i);
        globalx1 = mulscale10(dmulscale10(ox,singlobalang,-oy,cosglobalang),i);
        globaly1 = mulscale10(dmulscale10(ox,cosglobalang,oy,singlobalang),i);
        globalx2 = -globalx1;
        globaly2 = -globaly1;

        ox = ((wall[j].x-globalposx)<<6); oy = ((wall[j].y-globalposy)<<6);
        i = dmulscale14(oy,cosglobalang,-ox,singlobalang);
        j = dmulscale14(ox,cosglobalang,oy,singlobalang);
        ox = i; oy = j;
        globalxpanning = (coord_t)globalx1*ox - (coord_t)globaly1*oy;
        globalypanning = (coord_t)globaly2*ox + (coord_t)globalx2*oy;
    }
    globalx2 = mulscale16(globalx2,viewingrangerecip);
    globaly1 = mulscale16(globaly1,viewingrangerecip);

    calc_globalshifts();

    if ((globalorientation&0x4) > 0)
    {
        i = globalxpanning; globalxpanning = globalypanning; globalypanning = i;
        i = globalx2; globalx2 = -globaly1; globaly1 = -i;
        i = globalx1; globalx1 = globaly2; globaly2 = i;
    }
    if ((globalorientation&0x10) > 0) globalx1 = -globalx1, globaly1 = -globaly1, globalxpanning = -(inthi_t)globalxpanning;
    if ((globalorientation&0x20) > 0) globalx2 = -globalx2, globaly2 = -globaly2, globalypanning = -(inthi_t)globalypanning;
    globalx1 <<= globalxshift; globaly1 <<= globalxshift;
    globalx2 <<= globalyshift;  globaly2 <<= globalyshift;
    globalxpanning <<= globalxshift; globalypanning <<= globalyshift;
    globalxpanning = (uint32_t)globalxpanning + (xpanning<<24);
    globalypanning = (uint32_t)globalypanning + (ypanning<<24);
    globaly1 = (-globalx1-globaly1)*halfxdimen;
    globalx2 = (globalx2-globaly2)*halfxdimen;

    sethlinesizes(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4,globalbufplc);

    globalx2 += globaly2*(x1-1);
    globaly1 += globalx1*(x1-1);
    globalx1 = mulscale16(globalx1,globalzd);
    globalx2 = mulscale16(globalx2,globalzd);
    globaly1 = mulscale16(globaly1,globalzd);
    globaly2 = mulscale16(globaly2,globalzd);
    globvis = klabs(mulscale10(globvis,globalzd));

    return 0;
}

static void setup_blend(int32_t blend, int32_t doreverse)
{
    if (blendtable[blend] == NULL)
        blend = 0;

    if (globalblend != blend)
    {
        globalblend = blend;
        fixtransluscence(FP_OFF(getblendtab(blend)));
    }

    if (doreverse)
        settransreverse();
    else
        settransnormal();
}

//
// ceilscan (internal)
//
static void ceilscan(int32_t x1, int32_t x2, int32_t sectnum)
{
    int32_t x, y1, y2;
    const sectortype *const sec = &sector[sectnum];

    if (setup_globals_cf1(sec, sec->ceilingpal, sec->ceilingz-globalposz,
                          sec->ceilingpicnum, sec->ceilingshade, sec->ceilingstat,
                          sec->ceilingxpanning, sec->ceilingypanning, x1))
        return;

    if (!(globalorientation&0x180))
    {
        y1 = umost[x1]; y2 = y1;
        for (x=x1; x<=x2; x++)
        {
            const int32_t twall = umost[x]-1;
            const int32_t bwall = min(uplc[x],dmost[x]);

            if (twall < bwall-1)
            {
                if (twall >= y2)
                {
                    while (y1 < y2-1) hline(x-1,++y1);
                    y1 = twall;
                }
                else
                {
                    while (y1 < twall) hline(x-1,++y1);
                    while (y1 > twall) lastx[y1--] = x;
                }
                while (y2 > bwall) hline(x-1,--y2);
                while (y2 < bwall) lastx[y2++] = x;
            }
            else
            {
                while (y1 < y2-1) hline(x-1,++y1);
                if (x == x2) { globalx2 += globaly2; globaly1 += globalx1; break; }
                y1 = umost[x+1]; y2 = y1;
            }
            globalx2 += globaly2; globaly1 += globalx1;
        }
        while (y1 < y2-1) hline(x2,++y1);
        faketimerhandler();
        return;
    }

    switch (globalorientation&0x180)
    {
    case 128:
        msethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    case 256:
        setup_blend(0, 0);
        tsethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    case 384:
        setup_blend(0, 0);
        tsethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    }

    y1 = umost[x1]; y2 = y1;
    for (x=x1; x<=x2; x++)
    {
        const int32_t twall = umost[x]-1;
        const int32_t bwall = min(uplc[x],dmost[x]);

        if (twall < bwall-1)
        {
            if (twall >= y2)
            {
                while (y1 < y2-1) slowhline(x-1,++y1);
                y1 = twall;
            }
            else
            {
                while (y1 < twall) slowhline(x-1,++y1);
                while (y1 > twall) lastx[y1--] = x;
            }
            while (y2 > bwall) slowhline(x-1,--y2);
            while (y2 < bwall) lastx[y2++] = x;
        }
        else
        {
            while (y1 < y2-1) slowhline(x-1,++y1);
            if (x == x2) { globalx2 += globaly2; globaly1 += globalx1; break; }
            y1 = umost[x+1]; y2 = y1;
        }
        globalx2 += globaly2; globaly1 += globalx1;
    }
    while (y1 < y2-1) slowhline(x2,++y1);
    faketimerhandler();
}


//
// florscan (internal)
//
static void florscan(int32_t x1, int32_t x2, int32_t sectnum)
{
     int32_t x, y1, y2;
     const sectortype *const sec = &sector[sectnum];

     if (setup_globals_cf1(sec, sec->floorpal, globalposz-sec->floorz,
                           sec->floorpicnum, sec->floorshade, sec->floorstat,
                           sec->floorxpanning, sec->floorypanning, x1))
         return;

    if (!(globalorientation&0x180))
    {
        y1 = max(dplc[x1],umost[x1]); y2 = y1;
        for (x=x1; x<=x2; x++)
        {
            const int32_t twall = max(dplc[x],umost[x])-1;
            const int32_t bwall = dmost[x];

            if (twall < bwall-1)
            {
                if (twall >= y2)
                {
                    while (y1 < y2-1) hline(x-1,++y1);
                    y1 = twall;
                }
                else
                {
                    while (y1 < twall) hline(x-1,++y1);
                    while (y1 > twall) lastx[y1--] = x;
                }
                while (y2 > bwall) hline(x-1,--y2);
                while (y2 < bwall) lastx[y2++] = x;
            }
            else
            {
                while (y1 < y2-1) hline(x-1,++y1);
                if (x == x2) { globalx2 += globaly2; globaly1 += globalx1; break; }
                y1 = max(dplc[x+1],umost[x+1]); y2 = y1;
            }
            globalx2 += globaly2; globaly1 += globalx1;
        }
        while (y1 < y2-1) hline(x2,++y1);
        faketimerhandler();
        return;
    }

    switch (globalorientation&0x180)
    {
    case 128:
        msethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    case 256:
        setup_blend(0, 0);
        tsethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    case 384:
        setup_blend(0, 1);
        tsethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    }

    y1 = max(dplc[x1],umost[x1]); y2 = y1;
    for (x=x1; x<=x2; x++)
    {
        const int32_t twall = max(dplc[x],umost[x])-1;
        const int32_t bwall = dmost[x];

        if (twall < bwall-1)
        {
            if (twall >= y2)
            {
                while (y1 < y2-1) slowhline(x-1,++y1);
                y1 = twall;
            }
            else
            {
                while (y1 < twall) slowhline(x-1,++y1);
                while (y1 > twall) lastx[y1--] = x;
            }
            while (y2 > bwall) slowhline(x-1,--y2);
            while (y2 < bwall) lastx[y2++] = x;
        }
        else
        {
            while (y1 < y2-1) slowhline(x-1,++y1);
            if (x == x2) { globalx2 += globaly2; globaly1 += globalx1; break; }
            y1 = max(dplc[x+1],umost[x+1]); y2 = y1;
        }
        globalx2 += globaly2; globaly1 += globalx1;
    }
    while (y1 < y2-1) slowhline(x2,++y1);
    faketimerhandler();
}


//
// wallscan (internal)
//
static void wallscan(int32_t x1, int32_t x2,
                     const int16_t *uwal, const int16_t *dwal,
                     const int32_t *swal, const int32_t *lwal)
{
    int32_t x;
    intptr_t fpalookup;
    int32_t y1ve[4], y2ve[4];
    vec2_t tsiz;
#ifdef MULTI_COLUMN_VLINE
    char bad;
    int32_t u4, d4, z;
    uintptr_t p;
#endif

#ifdef YAX_ENABLE
    if (g_nodraw)
        return;
#endif
    setgotpic(globalpicnum);
    if (globalshiftval < 0)
        return;

    if (x2 >= xdim)
        x2 = xdim-1;
    assert((unsigned)x1 < (unsigned)xdim);

    tsiz = tilesiz[globalpicnum];

    if ((tsiz.x <= 0) || (tsiz.y <= 0)) return;
    if ((uwal[x1] > ydimen) && (uwal[x2] > ydimen)) return;
    if ((dwal[x1] < 0) && (dwal[x2] < 0)) return;

    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);

    tweak_tsizes(&tsiz);

    fpalookup = FP_OFF(palookup[globalpal]);

    setupvlineasm(globalshiftval);


    x = x1;
    while ((x <= x2) && (umost[x] > dmost[x]))
        x++;

#ifdef NONPOW2_YSIZE_ASM
    if (globalshiftval==0)
        goto do_vlineasm1;
#endif

#ifdef MULTI_COLUMN_VLINE
    for (; (x<=x2)&&((x+frameoffset)&3); x++)
    {
        y1ve[0] = max(uwal[x],umost[x]);
        y2ve[0] = min(dwal[x],dmost[x]);
        if (y2ve[0] <= y1ve[0]) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swal[x],globvis));

        calc_bufplc(&bufplce[0], lwal[x], tsiz);
        calc_vplcinc(&vplce[0], &vince[0], swal, x, y1ve[0]);

        vlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],x+frameoffset+ylookup[y1ve[0]]);
    }
    for (; x<=x2-3; x+=4)
    {
        bad = 0;
        for (z=3; z>=0; z--)
        {
            y1ve[z] = max(uwal[x+z],umost[x+z]);
            y2ve[z] = min(dwal[x+z],dmost[x+z])-1;
            if (y2ve[z] < y1ve[z]) { bad += pow2char[z]; continue; }

            calc_bufplc(&bufplce[z], lwal[x+z], tsiz);
            calc_vplcinc(&vplce[z], &vince[z], swal, x+z, y1ve[z]);
        }
        if (bad == 15) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swal[x],globvis));
        palookupoffse[3] = fpalookup + getpalookupsh(mulscale16(swal[x+3],globvis));

        if ((palookupoffse[0] == palookupoffse[3]) && ((bad&0x9) == 0))
        {
            palookupoffse[1] = palookupoffse[0];
            palookupoffse[2] = palookupoffse[0];
        }
        else
        {
            palookupoffse[1] = fpalookup + getpalookupsh(mulscale16(swal[x+1],globvis));
            palookupoffse[2] = fpalookup + getpalookupsh(mulscale16(swal[x+2],globvis));
        }

        u4 = max(max(y1ve[0],y1ve[1]),max(y1ve[2],y1ve[3]));
        d4 = min(min(y2ve[0],y2ve[1]),min(y2ve[2],y2ve[3]));

        if ((bad != 0) || (u4 >= d4))
        {
            if (!(bad&1)) prevlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0],vplce[0],bufplce[0],ylookup[y1ve[0]]+x+frameoffset+0);
            if (!(bad&2)) prevlineasm1(vince[1],palookupoffse[1],y2ve[1]-y1ve[1],vplce[1],bufplce[1],ylookup[y1ve[1]]+x+frameoffset+1);
            if (!(bad&4)) prevlineasm1(vince[2],palookupoffse[2],y2ve[2]-y1ve[2],vplce[2],bufplce[2],ylookup[y1ve[2]]+x+frameoffset+2);
            if (!(bad&8)) prevlineasm1(vince[3],palookupoffse[3],y2ve[3]-y1ve[3],vplce[3],bufplce[3],ylookup[y1ve[3]]+x+frameoffset+3);
            continue;
        }

        if (u4 > y1ve[0]) vplce[0] = prevlineasm1(vince[0],palookupoffse[0],u4-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+x+frameoffset+0);
        if (u4 > y1ve[1]) vplce[1] = prevlineasm1(vince[1],palookupoffse[1],u4-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+x+frameoffset+1);
        if (u4 > y1ve[2]) vplce[2] = prevlineasm1(vince[2],palookupoffse[2],u4-y1ve[2]-1,vplce[2],bufplce[2],ylookup[y1ve[2]]+x+frameoffset+2);
        if (u4 > y1ve[3]) vplce[3] = prevlineasm1(vince[3],palookupoffse[3],u4-y1ve[3]-1,vplce[3],bufplce[3],ylookup[y1ve[3]]+x+frameoffset+3);

        if (d4 >= u4) vlineasm4(d4-u4+1, (char *)(ylookup[u4]+x+frameoffset));

        p = x+frameoffset+ylookup[d4+1];
        if (y2ve[0] > d4) prevlineasm1(vince[0],palookupoffse[0],y2ve[0]-d4-1,vplce[0],bufplce[0],p+0);
        if (y2ve[1] > d4) prevlineasm1(vince[1],palookupoffse[1],y2ve[1]-d4-1,vplce[1],bufplce[1],p+1);
        if (y2ve[2] > d4) prevlineasm1(vince[2],palookupoffse[2],y2ve[2]-d4-1,vplce[2],bufplce[2],p+2);
        if (y2ve[3] > d4) prevlineasm1(vince[3],palookupoffse[3],y2ve[3]-d4-1,vplce[3],bufplce[3],p+3);
    }
#endif

#ifdef NONPOW2_YSIZE_ASM
do_vlineasm1:
#endif
    for (; x<=x2; x++)
    {
        y1ve[0] = max(uwal[x],umost[x]);
        y2ve[0] = min(dwal[x],dmost[x]);
        if (y2ve[0] <= y1ve[0]) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swal[x],globvis));

        calc_bufplc(&bufplce[0], lwal[x], tsiz);
        calc_vplcinc(&vplce[0], &vince[0], swal, x, y1ve[0]);

#ifdef NONPOW2_YSIZE_ASM
        if (globalshiftval==0)
            vlineasm1nonpow2(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],x+frameoffset+ylookup[y1ve[0]]);
        else
#endif
        vlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],x+frameoffset+ylookup[y1ve[0]]);
    }

    faketimerhandler();
}

//
// transmaskvline (internal)
//
static void transmaskvline(int32_t x)
{
    uint32_t vplc;
    int32_t vinc;
    intptr_t palookupoffs;
    intptr_t bufplc,p;
    int32_t y1v, y2v;

    vec2_t ntsiz;

    if ((x < 0) || (x >= xdimen)) return;

    y1v = max(uwall[x],startumost[x+windowx1]-windowy1);
    y2v = min(dwall[x],startdmost[x+windowx1]-windowy1);
    y2v--;
    if (y2v < y1v) return;

    palookupoffs = FP_OFF(palookup[globalpal]) + getpalookupsh(mulscale16(swall[x],globvis));

    ntsiz.x = -tilesiz[globalpicnum].x;
    ntsiz.y = -tilesiz[globalpicnum].y;
    calc_bufplc(&bufplc, lwall[x], ntsiz);
    calc_vplcinc(&vplc, &vinc, swall, x, y1v);

    p = ylookup[y1v]+x+frameoffset;

#ifdef NONPOW2_YSIZE_ASM
    if (globalshiftval==0)
        tvlineasm1nonpow2(vinc,palookupoffs,y2v-y1v,vplc,bufplc,p);
    else
#endif
    tvlineasm1(vinc,palookupoffs,y2v-y1v,vplc,bufplc,p);
}


//
// transmaskvline2 (internal)
//
#ifdef MULTI_COLUMN_VLINE
static void transmaskvline2(int32_t x)
{
    int32_t y1, y2, x2;
    int32_t y1ve[2], y2ve[2];

    uintptr_t p;

    vec2_t ntsiz;

    if ((x < 0) || (x >= xdimen)) return;
    if (x == xdimen-1) { transmaskvline(x); return; }

    x2 = x+1;

    y1ve[0] = max(uwall[x],startumost[x+windowx1]-windowy1);
    y2ve[0] = min(dwall[x],startdmost[x+windowx1]-windowy1)-1;
    if (y2ve[0] < y1ve[0]) { transmaskvline(x2); return; }
    y1ve[1] = max(uwall[x2],startumost[x2+windowx1]-windowy1);
    y2ve[1] = min(dwall[x2],startdmost[x2+windowx1]-windowy1)-1;
    if (y2ve[1] < y1ve[1]) { transmaskvline(x); return; }

    palookupoffse[0] = FP_OFF(palookup[globalpal]) + getpalookupsh(mulscale16(swall[x],globvis));
    palookupoffse[1] = FP_OFF(palookup[globalpal]) + getpalookupsh(mulscale16(swall[x2],globvis));

    setuptvlineasm2(globalshiftval,palookupoffse[0],palookupoffse[1]);

    ntsiz.x = -tilesiz[globalpicnum].x;
    ntsiz.y = -tilesiz[globalpicnum].y;

    calc_bufplc(&bufplce[0], lwall[x], ntsiz);
    calc_bufplc(&bufplce[1], lwall[x2], ntsiz);
    calc_vplcinc(&vplce[0], &vince[0], swall, x, y1ve[0]);
    calc_vplcinc(&vplce[1], &vince[1], swall, x2, y1ve[1]);

    y1 = max(y1ve[0],y1ve[1]);
    y2 = min(y2ve[0],y2ve[1]);

    p = x+frameoffset;

    if (y1ve[0] != y1ve[1])
    {
        if (y1ve[0] < y1)
            vplce[0] = tvlineasm1(vince[0],palookupoffse[0],y1-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+p);
        else
            vplce[1] = tvlineasm1(vince[1],palookupoffse[1],y1-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
    }

    if (y2 > y1)
    {
        asm1 = vince[1];
        asm2 = ylookup[y2]+p+1;
        tvlineasm2(vplce[1],vince[0],bufplce[0],bufplce[1],vplce[0],ylookup[y1]+p);
    }
    else
    {
        asm1 = vplce[0];
        asm2 = vplce[1];
    }

    if (y2ve[0] > y2ve[1])
        tvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y2-1,asm1,bufplce[0],ylookup[y2+1]+p);
    else if (y2ve[0] < y2ve[1])
        tvlineasm1(vince[1],palookupoffse[1],y2ve[1]-y2-1,asm2,bufplce[1],ylookup[y2+1]+p+1);

    faketimerhandler();
}
#endif

//
// transmaskwallscan (internal)
//
static void transmaskwallscan(int32_t x1, int32_t x2, int32_t saturatevplc)
{
    int32_t x;

    setgotpic(globalpicnum);

    Bassert(globalshiftval>=0 || ((tilesiz[globalpicnum].x <= 0) || (tilesiz[globalpicnum].y <= 0)));
    // globalshiftval<0 implies following condition
    if ((tilesiz[globalpicnum].x <= 0) || (tilesiz[globalpicnum].y <= 0))
        return;

    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);

    setuptvlineasm(globalshiftval, saturatevplc);

    x = x1;
    while ((x <= x2) && (startumost[x+windowx1] > startdmost[x+windowx1]))
        x++;

#ifndef ENGINE_USING_A_C
    if (globalshiftval==0)
    {
        while (x <= x2) transmaskvline(x), x++;
    }
    else
#endif
    {
#ifdef MULTI_COLUMN_VLINE
        if ((x <= x2) && (x&1)) transmaskvline(x), x++;
        while (x < x2) transmaskvline2(x), x += 2;
#endif
        while (x <= x2) transmaskvline(x), x++;
    }

    faketimerhandler();
}


////////// NON-power-of-two replacements for mhline/thline, adapted from a.c //////////
#if defined(__GNUC__) && defined(__i386__) && !defined(NOASM)
// from pragmas.h
# define ourdivscale32(d,b) \
	({ int32_t __d=(d), __b=(b), __r; \
	   __asm__ __volatile__ ("xorl %%eax, %%eax; divl %%ebx" \
		: "=a" (__r), "=d" (__d) : "d" (__d), "b" (__b) : "cc"); \
	 __r; })
#else
# define ourdivscale32(d,b) divscale32(d,b)
#endif

// cntup16>>16 iterations

static void nonpow2_mhline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_t junk, uint32_t by, char *p)
{
    char ch;

    const char *const A_C_RESTRICT buf = (char *)bufplc;
    const char *const A_C_RESTRICT pal = (char *)asm3;

    const uint32_t xdiv = globalxspan > 1 ? (uint32_t)ourdivscale32(1, globalxspan) : UINT32_MAX;
    const uint32_t ydiv = globalyspan > 1 ? (uint32_t)ourdivscale32(1, globalyspan) : UINT32_MAX;
    const uint32_t yspan = globalyspan;
    const int32_t xinc = asm1, yinc = asm2;

    UNREFERENCED_PARAMETER(junk);

    for (cntup16>>=16; cntup16>0; cntup16--)
    {
        ch = buf[(divideu32(bx, xdiv))*yspan + divideu32(by, ydiv)];

        if (ch != 255) *p = pal[ch];
        bx += xinc;
        by += yinc;
        p++;
    }
}

// cntup16>>16 iterations
static void nonpow2_thline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_t junk, uint32_t by, char *p)
{
    char ch;

    const char *const A_C_RESTRICT buf = (char *)bufplc;
    const char *const A_C_RESTRICT pal = (char *)asm3;
    const char *const A_C_RESTRICT trans = getblendtab(globalblend);

    const uint32_t xdiv = globalxspan > 1 ? (uint32_t)ourdivscale32(1, globalxspan) : UINT32_MAX;
    const uint32_t ydiv = globalyspan > 1 ? (uint32_t)ourdivscale32(1, globalyspan) : UINT32_MAX;
    const uint32_t yspan = globalyspan;
    const int32_t xinc = asm1, yinc = asm2;

    UNREFERENCED_PARAMETER(junk);

    if (globalorientation&512)
    {
        for (cntup16>>=16; cntup16>0; cntup16--)
        {
            ch = buf[divideu32(bx, xdiv)*yspan + divideu32(by, ydiv)];
            if (ch != 255) *p = trans[(*p)|(pal[ch]<<8)];
            bx += xinc;
            by += yinc;
            p++;
        }
    }
    else
    {
        for (cntup16>>=16; cntup16>0; cntup16--)
        {
            ch = buf[divideu32(bx, xdiv)*yspan + divideu32(by, ydiv)];
            if (ch != 255) *p = trans[((*p)<<8)|pal[ch]];
            bx += xinc;
            by += yinc;
            p++;
        }
    }
}
////////// END non-power-of-two replacements //////////

//
// ceilspritehline (internal)
//
static void ceilspritehline(int32_t x2, int32_t y)
{
    int32_t x1, v, bx, by;

    //x = x1 + (x2-x1)t + (y1-y2)u  ~  x = 160v
    //y = y1 + (y2-y1)t + (x2-x1)u  ~  y = (scrx-160)v
    //z = z1 = z2                   ~  z = posz + (scry-horiz)v

    x1 = lastx[y]; if (x2 < x1) return;

    v = mulscale20(globalzd,horizlookup[y-globalhoriz+horizycent]);
    bx = (uint32_t)mulscale14(globalx2*x1+globalx1,v) + globalxpanning;
    by = (uint32_t)mulscale14(globaly2*x1+globaly1,v) + globalypanning;
    asm1 = mulscale14(globalx2,v);
    asm2 = mulscale14(globaly2,v);

    asm3 = FP_OFF(palookup[globalpal]) + getpalookupsh(mulscale28(klabs(v),globvis));

    if (globalispow2)
    {
        if ((globalorientation&2) == 0)
            mhline(globalbufplc,bx,(x2-x1)<<16,0L,by,ylookup[y]+x1+frameoffset);
        else
            thline(globalbufplc,bx,(x2-x1)<<16,0L,by,ylookup[y]+x1+frameoffset);
    }
    else
    {
        if ((globalorientation&2) == 0)
            nonpow2_mhline(globalbufplc,bx,(x2-x1)<<16,0L,by,(char *)(ylookup[y]+x1+frameoffset));
        else
            nonpow2_thline(globalbufplc,bx,(x2-x1)<<16,0L,by,(char *)(ylookup[y]+x1+frameoffset));
    }
}


//
// ceilspritescan (internal)
//
static void ceilspritescan(int32_t x1, int32_t x2)
{
    int32_t x;

    int32_t y1 = uwall[x1];
    int32_t y2 = y1;

    for (x=x1; x<=x2; x++)
    {
        const int32_t twall = uwall[x]-1;
        const int32_t bwall = dwall[x];

        if (twall < bwall-1)
        {
            if (twall >= y2)
            {
                while (y1 < y2-1) ceilspritehline(x-1,++y1);
                y1 = twall;
            }
            else
            {
                while (y1 < twall) ceilspritehline(x-1,++y1);
                while (y1 > twall) lastx[y1--] = x;
            }
            while (y2 > bwall) ceilspritehline(x-1,--y2);
            while (y2 < bwall) lastx[y2++] = x;
        }
        else
        {
            while (y1 < y2-1) ceilspritehline(x-1,++y1);
            if (x == x2) break;
            y1 = uwall[x+1]; y2 = y1;
        }
    }
    while (y1 < y2-1) ceilspritehline(x2,++y1);
    faketimerhandler();
}

////////// translucent slope vline, based on a-c.c's slopevlin //////////
static int32_t gglogx, gglogy, ggpinc;
static char *ggbuf, *ggpal;

#ifdef ENGINE_USING_A_C
extern int32_t gpinc;
#endif

static inline void setupslopevlin_alsotrans(int32_t logylogx, intptr_t bufplc, int32_t pinc)
{
#ifdef ENGINE_USING_A_C
    sethlinesizes(logylogx&255, logylogx>>8, bufplc);
    gpinc = pinc;
#else
    setupslopevlin(logylogx, bufplc, pinc);
#endif
    gglogx = (logylogx&255); gglogy = (logylogx>>8);
    ggbuf = (char *)bufplc; ggpinc = pinc;
    ggpal = palookup[globalpal] + getpalookupsh(0);
}

// cnt iterations
static void tslopevlin(uint8_t *p, int32_t i, const intptr_t *slopalptr, int32_t cnt, int32_t bx, int32_t by)
{
    const char *const A_C_RESTRICT buf = ggbuf;
    const char *const A_C_RESTRICT pal = ggpal;
    const char *const A_C_RESTRICT trans = getblendtab(0);
    const int32_t bzinc = (asm1>>3), pinc = ggpinc;

    const int32_t transmode = (globalorientation&128);
    const uint32_t xtou = globalx3, ytov = globaly3;
    const int32_t logx = gglogx, logy = gglogy;

    int32_t bz = asm3;

    do
    {
        uint8_t ch;
        uint32_t u, v;

        i = (sloptable[(bz>>6)+8192]); bz += bzinc;
        u = bx + xtou*i;
        v = by + ytov*i;
        ch = *(uint8_t *)(slopalptr[0] + buf[((u>>(32-logx))<<logy)+(v>>(32-logy))]);

        if (ch != 255)
            *p = trans[transmode ? *p|(pal[ch]<<8) : (*p<<8)|pal[ch]];

        slopalptr--;
        p += pinc;
    }
    while (--cnt);
}

//
// grouscan (internal)
//
#define BITSOFPRECISION 3  //Don't forget to change this in A.ASM also!
static void grouscan(int32_t dax1, int32_t dax2, int32_t sectnum, char dastat)
{
    int32_t i, l, x, y, dx, dy, wx, wy, y1, y2, daz;
    int32_t daslope, dasqr;
    int32_t shoffs, shinc, m1, m2;
    intptr_t *mptr1, *mptr2, j;

    // Er, yes, they're not global anymore:
    int32_t globalx, globaly, globalz, globalzx;

    const sectortype *const sec = &sector[sectnum];
    const walltype *wal;

    if (dastat == 0)
    {
        if (globalposz <= getceilzofslope(sectnum,globalposx,globalposy))
            return;  //Back-face culling
        globalorientation = sec->ceilingstat;
        globalpicnum = sec->ceilingpicnum;
        globalshade = sec->ceilingshade;
        globalpal = sec->ceilingpal;
        daslope = sec->ceilingheinum;
        daz = sec->ceilingz;
    }
    else
    {
        if (globalposz >= getflorzofslope(sectnum,globalposx,globalposy))
            return;  //Back-face culling
        globalorientation = sec->floorstat;
        globalpicnum = sec->floorpicnum;
        globalshade = sec->floorshade;
        globalpal = sec->floorpal;
        daslope = sec->floorheinum;
        daz = sec->floorz;
    }

    DO_TILE_ANIM(globalpicnum, sectnum);
    setgotpic(globalpicnum);
    if ((tilesiz[globalpicnum].x <= 0) || (tilesiz[globalpicnum].y <= 0)) return;
    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);

    wal = &wall[sec->wallptr];
    wx = wall[wal->point2].x - wal->x;
    wy = wall[wal->point2].y - wal->y;
    dasqr = krecipasm(nsqrtasm(uhypsq(wx,wy)));
    i = mulscale21(daslope,dasqr);
    wx *= i; wy *= i;

    globalx = -mulscale19(singlobalang,xdimenrecip);
    globaly = mulscale19(cosglobalang,xdimenrecip);
    globalx1 = (globalposx<<8);
    globaly1 = -(globalposy<<8);
    i = (dax1-halfxdimen)*xdimenrecip;
    globalx2 = mulscale16(cosglobalang<<4,viewingrangerecip) - mulscale27(singlobalang,i);
    globaly2 = mulscale16(singlobalang<<4,viewingrangerecip) + mulscale27(cosglobalang,i);
    globalzd = (xdimscale<<9);
    globalzx = -dmulscale17(wx,globaly2,-wy,globalx2) + mulscale10(1-globalhoriz,globalzd);
    globalz = -dmulscale25(wx,globaly,-wy,globalx);

    if (globalorientation&64)  //Relative alignment
    {
        dx = mulscale14(wall[wal->point2].x-wal->x,dasqr);
        dy = mulscale14(wall[wal->point2].y-wal->y,dasqr);

        i = nsqrtasm(daslope*daslope+16777216);

        x = globalx; y = globaly;
        globalx = dmulscale16(x,dx,y,dy);
        globaly = mulscale12(dmulscale16(-y,dx,x,dy),i);

        x = ((wal->x-globalposx)<<8); y = ((wal->y-globalposy)<<8);
        globalx1 = dmulscale16(-x,dx,-y,dy);
        globaly1 = mulscale12(dmulscale16(-y,dx,x,dy),i);

        x = globalx2; y = globaly2;
        globalx2 = dmulscale16(x,dx,y,dy);
        globaly2 = mulscale12(dmulscale16(-y,dx,x,dy),i);
    }
    if (globalorientation&0x4)
    {
        i = globalx; globalx = -globaly; globaly = -i;
        i = globalx1; globalx1 = globaly1; globaly1 = i;
        i = globalx2; globalx2 = -globaly2; globaly2 = -i;
    }
    if (globalorientation&0x10) { globalx1 = -globalx1, globalx2 = -globalx2, globalx = -globalx; }
    if (globalorientation&0x20) { globaly1 = -globaly1, globaly2 = -globaly2, globaly = -globaly; }

    daz = dmulscale9(wx,globalposy-wal->y,-wy,globalposx-wal->x) + ((daz-globalposz)<<8);
    globalx2 = mulscale20(globalx2,daz); globalx = mulscale28(globalx,daz);
    globaly2 = mulscale20(globaly2,-daz); globaly = mulscale28(globaly,-daz);

    i = 8-(picsiz[globalpicnum]&15); j = 8-(picsiz[globalpicnum]>>4);
    if (globalorientation&8) { i++; j++; }
    globalx1 <<= (i+12); globalx2 <<= i; globalx <<= i;
    globaly1 <<= (j+12); globaly2 <<= j; globaly <<= j;

    if (dastat == 0)
    {
        globalx1 += (uint32_t)sec->ceilingxpanning<<24;
        globaly1 += (uint32_t)sec->ceilingypanning<<24;
    }
    else
    {
        globalx1 += (uint32_t)sec->floorxpanning<<24;
        globaly1 += (uint32_t)sec->floorypanning<<24;
    }

    asm1 = -(globalzd>>(16-BITSOFPRECISION));

    {
        int32_t vis = globalvisibility;
        int64_t lvis;

        if (sec->visibility != 0) vis = mulscale4(vis, (uint8_t)(sec->visibility+16));
        lvis = ((uint64_t)vis*daz) >> 13;  // NOTE: lvis can be negative now!
        lvis = (lvis * xdimscale) >> 16;
        globvis = lvis;
    }

    j = FP_OFF(palookup[globalpal]);

    setupslopevlin_alsotrans((picsiz[globalpicnum]&15) + ((picsiz[globalpicnum]>>4)<<8),
                             waloff[globalpicnum],-ylookup[1]);

    l = (globalzd>>16);

    shinc = mulscale16(globalz,xdimenscale);
    if (shinc > 0) shoffs = (4<<15); else shoffs = ((16380-ydimen)<<15);    // JBF: was 2044
    if (dastat == 0) y1 = umost[dax1]; else y1 = max(umost[dax1],dplc[dax1]);
    m1 = mulscale16(y1,globalzd) + (globalzx>>6);
    //Avoid visibility overflow by crossing horizon
    if (globalzd > 0) m1 += (globalzd>>16); else m1 -= (globalzd>>16);
    m2 = m1+l;
    mptr1 = (intptr_t *)&slopalookup[y1+(shoffs>>15)]; mptr2 = mptr1+1;

    for (x=dax1; x<=dax2; x++)
    {
        if (dastat == 0) { y1 = umost[x]; y2 = min(dmost[x],uplc[x])-1; }
        else { y1 = max(umost[x],dplc[x]); y2 = dmost[x]-1; }
        if (y1 <= y2)
        {
            intptr_t *nptr1 = &slopalookup[y1+(shoffs>>15)];
            intptr_t *nptr2 = &slopalookup[y2+(shoffs>>15)];

            while (nptr1 <= mptr1)
            {
                *mptr1-- = j + getpalookupsh(mulscale24(krecipasm(m1),globvis));
                m1 -= l;
            }
            while (nptr2 >= mptr2)
            {
                *mptr2++ = j + getpalookupsh(mulscale24(krecipasm(m2),globvis));
                m2 += l;
            }

            globalx3 = (globalx2>>10);
            globaly3 = (globaly2>>10);
            asm3 = mulscale16(y2,globalzd) + (globalzx>>6);
            if ((globalorientation&256)==0)
                slopevlin(ylookup[y2]+x+frameoffset,krecipasm(asm3>>3),(intptr_t)nptr2,y2-y1+1,globalx1,globaly1);
            else
                tslopevlin((uint8_t *)(ylookup[y2]+x+frameoffset),0,nptr2,y2-y1+1,globalx1,globaly1);

            if ((x&15) == 0) faketimerhandler();
        }
        globalx2 += globalx;
        globaly2 += globaly;
        globalzx += globalz;
        shoffs += shinc;
    }
}


//
// parascan (internal)
//
static void parascan(int32_t dax1, int32_t dax2, int32_t sectnum, char dastat, int32_t bunch)
{
    sectortype *sec;
    int32_t j, k, l, m, n, x, z, wallnum, nextsectnum, globalhorizbak;
    int16_t *topptr, *botptr;

    int32_t dapyscale, dapskybits;
    const int8_t *dapskyoff;

    int32_t logtilesizy, tsizy;

    UNREFERENCED_PARAMETER(dax1);
    UNREFERENCED_PARAMETER(dax2);

    sectnum = thesector[bunchfirst[bunch]]; sec = &sector[sectnum];

    globalhorizbak = globalhoriz;
    globvis = globalpisibility;
    //globalorientation = 0L;
    if (sec->visibility != 0)
        globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));

    if (dastat == 0)
    {
        globalpal = sec->ceilingpal;
        globalpicnum = sec->ceilingpicnum;
        globalshade = (int32_t)sec->ceilingshade;
        globalxpanning = (int32_t)sec->ceilingxpanning;
        globalypanning = (int32_t)sec->ceilingypanning;
        topptr = umost;
        botptr = uplc;
    }
    else
    {
        globalpal = sec->floorpal;
        globalpicnum = sec->floorpicnum;
        globalshade = (int32_t)sec->floorshade;
        globalxpanning = (int32_t)sec->floorxpanning;
        globalypanning = (int32_t)sec->floorypanning;
        topptr = dplc;
        botptr = dmost;
    }

    if ((unsigned)globalpicnum >= MAXTILES) globalpicnum = 0;
    DO_TILE_ANIM(globalpicnum, sectnum);

    logtilesizy = (picsiz[globalpicnum]>>4);
    tsizy = tilesiz[globalpicnum].y;

    if (tsizy==0)
        return;

    dapskyoff = getpsky(globalpicnum, &dapyscale, &dapskybits);

    globalshiftval = logtilesizy;

    // before proper non-power-of-two tilesizy drawing
    if (oldnonpow2() && pow2long[logtilesizy] != tsizy)
        globalshiftval++;
#ifdef CLASSIC_NONPOW2_YSIZE_WALLS
    // non power-of-two y size textures!
    if ((!oldnonpow2() && pow2long[logtilesizy] != tsizy) || tsizy >= 512)
    {
        globaltilesizy = tsizy;
        globalyscale = 65536 / tsizy;
        globalshiftval = 0;
        globalzd = divscale32(((tsizy>>1)+parallaxyoffs_override/*+g_psky.yoffs*/), tsizy) + ((uint32_t)globalypanning<<24);
    }
    else
#endif
    {
        globalshiftval = 32-globalshiftval;
        globalyscale = (8<<(globalshiftval-19));
        globalzd = (((tsizy>>1)+parallaxyoffs_override/*+g_psky.yoffs*/)<<globalshiftval) + ((uint32_t)globalypanning<<24);
    }

    //if (globalorientation&256) globalyscale = -globalyscale, globalzd = -globalzd;

    if (dapyscale != 65536)
        globalhoriz = mulscale16(globalhoriz-(ydimen>>1),dapyscale) + (ydimen>>1);

    k = 11 - (picsiz[globalpicnum]&15) - dapskybits;

    // WGR2 SVN: select new episode after playing wgmicky1 with Polymer
    //  (maybe switched to classic earlier).
    //  --> rendmode==0, glrendermode == REND_POLYMER, we end up with globalpicnum==266,
    //      picsiz...==9 and dapskybits==3
    // FIXME ?
    if (k < 0)
        k = 0;

    x = -1;

    for (z=bunchfirst[bunch]; z>=0; z=bunchp2[z])
    {
        wallnum = thewall[z]; nextsectnum = wall[wallnum].nextsector;

        if (nextsectnum >= 0)  //else negative array access
        {
            if (dastat == 0) j = sector[nextsectnum].ceilingstat;
            else j = sector[nextsectnum].floorstat;
        }

        if ((nextsectnum < 0) || (wall[wallnum].cstat&32) || ((j&1) == 0))
        {
            if (x == -1) x = xb1[z];

            if (parallaxtype == 0 || no_radarang2)
            {
                n = mulscale16(xdimenrecip,viewingrange);
                for (j=xb1[z]; j<=xb2[z]; j++)
                    lplc[j] = ((mulscale23(j-halfxdimen,n)+globalang)&2047)>>k;
            }
            else
            {
                for (j=xb1[z]; j<=xb2[z]; j++)
                    lplc[j] = ((radarang2[j]+globalang)&2047)>>k;
            }

            if (parallaxtype == 2 && !no_radarang2)
            {
                n = mulscale16(xdimscale,viewingrange);
                for (j=xb1[z]; j<=xb2[z]; j++)
                    swplc[j] = mulscale14(sintable[(radarang2[j]+512)&2047],n);
            }
            else
                clearbuf(&swplc[xb1[z]],xb2[z]-xb1[z]+1,mulscale16(xdimscale,viewingrange));
        }
        else if (x >= 0)
        {
            l = globalpicnum; m = (picsiz[globalpicnum]&15);
            globalpicnum = l + dapskyoff[lplc[x]>>m];

            if (((lplc[x]^lplc[xb1[z]-1])>>m) == 0)
                wallscan(x,xb1[z]-1,topptr,botptr,swplc,lplc);
            else
            {
                j = x;
                while (x < xb1[z])
                {
                    n = l + dapskyoff[lplc[x]>>m];
                    if (n != globalpicnum)
                    {
                        wallscan(j,x-1,topptr,botptr,swplc,lplc);
                        j = x;
                        globalpicnum = n;
                    }
                    x++;
                }
                if (j < x)
                    wallscan(j,x-1,topptr,botptr,swplc,lplc);
            }

            globalpicnum = l;
            x = -1;
        }
    }

    if (x >= 0)
    {
        l = globalpicnum; m = (picsiz[globalpicnum]&15);
        globalpicnum = l + dapskyoff[lplc[x]>>m];

        if (((lplc[x]^lplc[xb2[bunchlast[bunch]]])>>m) == 0)
            wallscan(x,xb2[bunchlast[bunch]],topptr,botptr,swplc,lplc);
        else
        {
            j = x;
            while (x <= xb2[bunchlast[bunch]])
            {
                n = l + dapskyoff[lplc[x]>>m];
                if (n != globalpicnum)
                {
                    wallscan(j,x-1,topptr,botptr,swplc,lplc);
                    j = x;
                    globalpicnum = n;
                }
                x++;
            }
            if (j <= x)
                wallscan(j,x-1,topptr,botptr,swplc,lplc);
        }
        globalpicnum = l;
    }
    globalhoriz = globalhorizbak;
}


// set orientation, panning, shade, pal; picnum
static void setup_globals_wall1(const walltype *wal, int32_t dapicnum)
{
    globalorientation = wal->cstat;

    globalpicnum = dapicnum;
    if ((unsigned)globalpicnum >= MAXTILES) globalpicnum = 0;
    DO_TILE_ANIM(globalpicnum, 0);

    globalxpanning = wal->xpanning;
    globalypanning = wal->ypanning;

    globalshade = wal->shade;
    globalpal = wal->pal;
    if (palookup[globalpal] == NULL) globalpal = 0;    // JBF: fixes crash
}

static void setup_globals_wall2(const walltype *wal, uint8_t secvisibility, int32_t topzref, int32_t botzref)
{
    const int32_t logtilesizy = (picsiz[globalpicnum]>>4);
    const int32_t tsizy = tilesiz[globalpicnum].y;

    if (tsizy==0)
    {
        globalshiftval = -1;
        return;
    }

    globvis = globalvisibility;
    if (secvisibility != 0)
        globvis = mulscale4(globvis, (uint8_t)(secvisibility+16));

    globalshiftval = logtilesizy;

    // before proper non-power-of-two tilesizy drawing
    if (oldnonpow2() && pow2long[logtilesizy] != tsizy)
        globalshiftval++;
#ifdef CLASSIC_NONPOW2_YSIZE_WALLS
    // non power-of-two y size textures!
    if ((!oldnonpow2() && pow2long[logtilesizy] != tsizy) || tsizy >= 512)
    {
        globaltilesizy = tsizy;
        globalyscale = divscale13(wal->yrepeat, tsizy);
        globalshiftval = 0;
    }
    else
#endif
    {
        // globalshiftval==13 --> globalshiftval==19
        //  ==> upper texture y size limit *here* = 8192
        globalshiftval = 32-globalshiftval;
        globalyscale = wal->yrepeat<<(globalshiftval-19);
    }

    if ((globalorientation&4) == 0)
        globalzd = (((int64_t)(globalposz-topzref)*globalyscale)<<8);
    else  // bottom-aligned
        globalzd = (((int64_t)(globalposz-botzref)*globalyscale)<<8);
    globalzd = (uint32_t)globalzd + (globalypanning<<24);

    if (globalorientation&256)  // y-flipped
        globalyscale = -globalyscale, globalzd = -(inthi_t)globalzd;
}


/* _______________
 * X umost #######
 * ###### ________
 * ______/
 * X dwall
 *
 * ________
 * X uwall \______
 * ///////////////
 * _______________
 * X dmost
 */

#ifdef YAX_ENABLE
// returns: should dmost be raised when drawing a "ceiling wall"?
static int32_t should_clip_cwall(int32_t x1, int32_t x2)
{
    int32_t x;

    if (yax_globallev <= YAX_MAXDRAWS)
        return 1;

    for (x=x1; x<=x2; x++)
        if (dwall[x] < dmost[x] || uplc[x] < dmost[x])
            return 1;

    return 0;
}

// returns: should umost be lowered when drawing a "floor wall"?
static int32_t should_clip_fwall(int32_t x1, int32_t x2)
{
    int32_t x;

    if (yax_globallev >= YAX_MAXDRAWS)
        return 1;

    for (x=x1; x<=x2; x++)
        if (uwall[x] > umost[x] || dplc[x] > umost[x])
            return 1;

    return 0;
}
#endif

//
// drawalls (internal)
//
static void drawalls(int32_t bunch)
{
    int32_t i, x;

    int32_t z = bunchfirst[bunch];

    const int32_t sectnum = thesector[z];
    const sectortype *const sec = &sector[sectnum];

    uint8_t andwstat1 = 0xff, andwstat2 = 0xff;

    for (; z>=0; z=bunchp2[z]) //uplc/dplc calculation
    {
        andwstat1 &= wallmost(uplc,z,sectnum,(uint8_t)0);
        andwstat2 &= wallmost(dplc,z,sectnum,(uint8_t)1);
    }

#ifdef YAX_ENABLE
    if (g_nodraw)
    {
        int32_t baselevp, checkcf;
        int16_t bn[2];
# if 0
        int32_t obunchchk = (1 && yax_globalbunch>=0 &&
                             haveymost[yax_globalbunch>>3]&(1<<(yax_globalbunch&7)));

        // if (obunchchk)
        const int32_t x2 = yax_globalbunch*xdimen;
# endif
        baselevp = (yax_globallev == YAX_MAXDRAWS);

        yax_getbunches(sectnum, &bn[0], &bn[1]);
        checkcf = (bn[0]>=0) + ((bn[1]>=0)<<1);
        if (!baselevp)
            checkcf &= (1<<yax_globalcf);

        if ((andwstat1&3) == 3)  // ceilings clipped
            checkcf &= ~1;
        if ((andwstat2&12) == 12)  // floors clipped
            checkcf &= ~2;

        for (i=0; i<2; i++)
            if (checkcf&(1<<i))
            {
                if ((haveymost[bn[i]>>3]&(1<<(bn[i]&7)))==0)
                {
                    // init yax *most arrays for that bunch
                    haveymost[bn[i]>>3] |= (1<<(bn[i]&7));
                    for (x=xdimen*bn[i]; x<xdimen*(bn[i]+1); x++)
                    {
                        yumost[x] = ydimen;
                        ydmost[x] = 0;
                    }
                }

                const int32_t x1 = bn[i]*xdimen;

                for (x=x1+xb1[bunchfirst[bunch]]; x<=x1+xb2[bunchlast[bunch]]; x++)
                {
                    if (i==YAX_CEILING)
                    {
                        yumost[x] = min(yumost[x], umost[x-x1]);
                        ydmost[x] = max(ydmost[x], min(dmost[x-x1], uplc[x-x1]));
                    }
                    else
                    {
                        yumost[x] = min(yumost[x], max(umost[x-x1], dplc[x-x1]));
                        ydmost[x] = max(ydmost[x], dmost[x-x1]);
                    }
# if 0
                    if (obunchchk)
                    {
                        yumost[x] = max(yumost[x], yumost[x-x1+x2]);
                        ydmost[x] = min(ydmost[x], ydmost[x-x1+x2]);
                    }
# endif
                }
            }
    }
    else
#endif
    {
        if ((andwstat1&3) != 3)     //draw ceilings
#ifdef YAX_ENABLE
            // this is to prevent double-drawing of translucent masked ceilings
            if (r_tror_nomaskpass==0 || yax_globallev==YAX_MAXDRAWS || (sec->ceilingstat&256)==0 ||
                yax_nomaskpass==1 || !(yax_gotsector[sectnum>>3]&(1<<(sectnum&7))))
#endif
        {
            if ((sec->ceilingstat&3) == 2)
                grouscan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum,0);
            else if ((sec->ceilingstat&1) == 0)
                ceilscan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum);
            else
                parascan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum,0,bunch);
        }

        if ((andwstat2&12) != 12)   //draw floors
#ifdef YAX_ENABLE
            // this is to prevent double-drawing of translucent masked floors
            if (r_tror_nomaskpass==0 || yax_globallev==YAX_MAXDRAWS || (sec->floorstat&256)==0 ||
                yax_nomaskpass==1 || !(yax_gotsector[sectnum>>3]&(1<<(sectnum&7))))
#endif
        {
            if ((sec->floorstat&3) == 2)
                grouscan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum,1);
            else if ((sec->floorstat&1) == 0)
                florscan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum);
            else
                parascan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum,1,bunch);
        }
    }


    //DRAW WALLS SECTION!
    for (z=bunchfirst[bunch]; z>=0; z=bunchp2[z])
    {
        const int32_t x1 = xb1[z], x2 = xb2[z];

        if (umost[x2] >= dmost[x2])
        {
            for (x=x1; x<x2; x++)
                if (umost[x] < dmost[x])
                    break;
            if (x >= x2)
            {
                smostwall[smostwallcnt] = z;
                smostwalltype[smostwallcnt] = 0;
                smostwallcnt++;
                continue;
            }
        }

        const int32_t wallnum = thewall[z];
        const walltype *const wal = &wall[wallnum];

        const int32_t nextsectnum = wal->nextsector;
        const sectortype *const nextsec = nextsectnum>=0 ? &sector[nextsectnum] : NULL;

        int32_t gotswall = 0;

        const int32_t startsmostwallcnt = smostwallcnt;
        const int32_t startsmostcnt = smostcnt;

        if (searchit == 2 && (searchx >= x1 && searchx <= x2))
        {
            if (searchy <= uplc[searchx]
#ifdef YAX_ENABLE
                && umost[searchx] <= searchy && getceilzofslope(sectnum, globalposx, globalposy) <= globalposz
                && (yax_getbunch(sectnum, YAX_CEILING) < 0 || showinvisibility || (sec->ceilingstat&(256+128)) || klabs(yax_globallev-YAX_MAXDRAWS)==YAX_MAXDRAWS)
#endif
                ) //ceiling
            {
                searchsector = sectnum; searchwall = wallnum;
                searchstat = 1; searchit = 1;
            }
            else if (dplc[searchx] <= searchy
#ifdef YAX_ENABLE
                     && searchy < dmost[searchx] && getflorzofslope(sectnum, globalposx, globalposy) >= globalposz
                     && (yax_getbunch(sectnum, YAX_FLOOR) < 0 || showinvisibility || (sec->floorstat&(256+128)) || klabs(yax_globallev-YAX_MAXDRAWS)==YAX_MAXDRAWS)
#endif
                ) //floor
            {
                searchsector = sectnum; searchwall = wallnum;
                searchstat = 2; searchit = 1;
            }
        }

#ifdef YAX_ENABLE
        if (yax_nomaskpass==0 || !yax_isislandwall(wallnum, !yax_globalcf) || (yax_nomaskdidit=1, 0))
#endif
        if (nextsectnum >= 0)
        {
            // 2       <---       3
            // x------------------x
            // 0       --->       1
            //
            //     4 (our pos, z wrt the nextsector!)

            int32_t cz[5], fz[5];

            getzsofslope((int16_t)sectnum,wal->x,wal->y,&cz[0],&fz[0]);
            getzsofslope((int16_t)sectnum,wall[wal->point2].x,wall[wal->point2].y,&cz[1],&fz[1]);
            getzsofslope((int16_t)nextsectnum,wal->x,wal->y,&cz[2],&fz[2]);
            getzsofslope((int16_t)nextsectnum,wall[wal->point2].x,wall[wal->point2].y,&cz[3],&fz[3]);
            getzsofslope((int16_t)nextsectnum,globalposx,globalposy,&cz[4],&fz[4]);

            if ((wal->cstat&48) == 16)
                maskwall[maskwallcnt++] = z;

            if (((sec->ceilingstat&1) == 0) || ((nextsec->ceilingstat&1) == 0))
            {
                if ((cz[2] <= cz[0]) && (cz[3] <= cz[1]))
                {
//                    if (globparaceilclip)
                    if (getceilzofslope(sectnum, globalposx, globalposy) <= globalposz)
                        for (x=x1; x<=x2; x++)
                            if (uplc[x] > umost[x])
                                if (umost[x] <= dmost[x])
                                {
                                    umost[x] = uplc[x];
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                }
                else
                {
                    wallmost(dwall,z,nextsectnum,(uint8_t)0);

                    if ((cz[2] > fz[0]) || (cz[3] > fz[1]))
                        for (i=x1; i<=x2; i++) if (dwall[i] > dplc[i]) dwall[i] = dplc[i];

                    if (searchit == 2 && (searchx >= x1 && searchx <= x2))
#ifdef YAX_ENABLE
                        if (uplc[searchx] <= searchy)
#endif
                        if (searchy <= dwall[searchx]) //wall
                        {
                            searchsector = sectnum; searchbottomwall = searchwall = wallnum;
                            searchisbottom = 0;
                            searchstat = 0; searchit = 1;
                        }

                    setup_globals_wall1(wal, wal->picnum);
                    setup_globals_wall2(wal, sec->visibility, nextsec->ceilingz, sec->ceilingz);

                    if (gotswall == 0) { gotswall = 1; prepwall(z,wal); }
                    wallscan(x1,x2,uplc,dwall,swall,lwall);

                    if ((cz[2] >= cz[0]) && (cz[3] >= cz[1]))
                    {
#ifdef YAX_ENABLE
                        if (should_clip_cwall(x1, x2))
#endif
                        for (x=x1; x<=x2; x++)
                            if (dwall[x] > umost[x])
                                if (umost[x] <= dmost[x])
                                {
                                    umost[x] = dwall[x];
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                    }
                    else
                    {
#ifdef YAX_ENABLE
                        if (should_clip_cwall(x1, x2))
#endif
                        for (x=x1; x<=x2; x++)
                            if (umost[x] <= dmost[x])
                            {
                                i = max(uplc[x],dwall[x]);
                                if (i > umost[x])
                                {
                                    umost[x] = i;
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                            }
                    }
                }

                if ((cz[2] < cz[0]) || (cz[3] < cz[1]) || (globalposz < cz[4]))
                {
                    i = x2-x1+1;
                    if (smostcnt+i < ysavecnt)
                    {
                        smoststart[smostwallcnt] = smostcnt;
                        smostwall[smostwallcnt] = z;
                        smostwalltype[smostwallcnt] = 1;   //1 for umost
                        smostwallcnt++;
                        copybufbyte(&umost[x1],&smost[smostcnt],i*sizeof(smost[0]));
                        smostcnt += i;
                    }
                }
            }

            if (((sec->floorstat&1) == 0) || ((nextsec->floorstat&1) == 0))
            {
                if ((fz[2] >= fz[0]) && (fz[3] >= fz[1]))
                {
//                    if (globparaflorclip)
                    if (getflorzofslope(sectnum, globalposx, globalposy) >= globalposz)
                        for (x=x1; x<=x2; x++)
                            if (dplc[x] < dmost[x])
                                if (umost[x] <= dmost[x])
                                {
                                    dmost[x] = dplc[x];
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                }
                else
                {
                    wallmost(uwall,z,nextsectnum,(uint8_t)1);

                    if ((fz[2] < cz[0]) || (fz[3] < cz[1]))
                        for (i=x1; i<=x2; i++) if (uwall[i] < uplc[i]) uwall[i] = uplc[i];

                    if (searchit == 2 && (searchx >= x1 && searchx <= x2))
#ifdef YAX_ENABLE
                        if (dplc[searchx] >= searchy)
#endif
                        if (searchy >= uwall[searchx]) //wall
                        {
                            searchsector = sectnum; searchbottomwall = searchwall = wallnum;
                            if ((wal->cstat&2) > 0) searchbottomwall = wal->nextwall;
                            searchisbottom = 1;
                            searchstat = 0; searchit = 1;
                        }

                    {
                        const walltype *twal = (wal->cstat&2) ? &wall[wal->nextwall] : wal;
                        setup_globals_wall1(twal, twal->picnum);
                    }

                    setup_globals_wall2(wal, sec->visibility, nextsec->floorz, sec->ceilingz);

                    if (gotswall == 0) { gotswall = 1; prepwall(z,wal); }
                    wallscan(x1,x2,uwall,dplc,swall,lwall);

                    if ((fz[2] <= fz[0]) && (fz[3] <= fz[1]))
                    {
#ifdef YAX_ENABLE
                        if (should_clip_fwall(x1, x2))
#endif
                        for (x=x1; x<=x2; x++)
                            if (uwall[x] < dmost[x])
                                if (umost[x] <= dmost[x])
                                {
                                    dmost[x] = uwall[x];
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                    }
                    else
                    {
#ifdef YAX_ENABLE
                        if (should_clip_fwall(x1, x2))
#endif
                        for (x=x1; x<=x2; x++)
                            if (umost[x] <= dmost[x])
                            {
                                i = min(dplc[x],uwall[x]);
                                if (i < dmost[x])
                                {
                                    dmost[x] = i;
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                            }
                    }
                }

                if ((fz[2] > fz[0]) || (fz[3] > fz[1]) || (globalposz > fz[4]))
                {
                    i = x2-x1+1;
                    if (smostcnt+i < ysavecnt)
                    {
                        smoststart[smostwallcnt] = smostcnt;
                        smostwall[smostwallcnt] = z;
                        smostwalltype[smostwallcnt] = 2;   //2 for dmost
                        smostwallcnt++;
                        copybufbyte(&dmost[x1],&smost[smostcnt],i*sizeof(smost[0]));
                        smostcnt += i;
                    }
                }
            }

            if (numhits < 0)
                return;

            if (!(wal->cstat&32) && (gotsector[nextsectnum>>3]&pow2char[nextsectnum&7]) == 0)
            {
                if (umost[x2] < dmost[x2])
                    scansector(nextsectnum);
                else
                {
                    for (x=x1; x<x2; x++)
                        if (umost[x] < dmost[x])
                            { scansector(nextsectnum); break; }

                    //If can't see sector beyond, then cancel smost array and just
                    //store wall!
                    if (x == x2)
                    {
                        smostwallcnt = startsmostwallcnt;
                        smostcnt = startsmostcnt;
                        smostwall[smostwallcnt] = z;
                        smostwalltype[smostwallcnt] = 0;
                        smostwallcnt++;
                    }
                }
            }
        }

        if (nextsectnum < 0 || (wal->cstat&32))   //White/1-way wall
        {
            setup_globals_wall1(wal, (nextsectnum < 0) ? wal->picnum : wal->overpicnum);
            setup_globals_wall2(wal, sec->visibility,
                                (nextsectnum >= 0) ? nextsec->ceilingz : sec->ceilingz,
                                (nextsectnum >= 0) ? sec->ceilingz : sec->floorz);

            if (gotswall == 0) { gotswall = 1; prepwall(z,wal); }
            wallscan(x1,x2,uplc,dplc,swall,lwall);

#ifdef YAX_ENABLE
            // TODO: slopes?

            if (globalposz > sec->floorz && yax_isislandwall(wallnum, YAX_FLOOR))
            {
                for (x=x1; x<=x2; x++)
                    if (dplc[x] > umost[x] && umost[x] <= dmost[x])
                    {
                        umost[x] = dplc[x];
                        if (umost[x] > dmost[x]) numhits--;
                    }
            }
            else if (globalposz < sec->ceilingz && yax_isislandwall(wallnum, YAX_CEILING))
            {
                for (x=x1; x<=x2; x++)
                    if (uplc[x] < dmost[x] && umost[x] <= dmost[x])
                    {
                        dmost[x] = uplc[x];
                        if (umost[x] > dmost[x]) numhits--;
                    }
            }
            else
#endif
            for (x=x1; x<=x2; x++)
                if (umost[x] <= dmost[x])
                    { umost[x] = 1; dmost[x] = 0; numhits--; }
            smostwall[smostwallcnt] = z;
            smostwalltype[smostwallcnt] = 0;
            smostwallcnt++;

            if (searchit == 2 && (x1 <= searchx && searchx <= x2))
#ifdef YAX_ENABLE
                if (uplc[searchx] <= searchy && searchy < dplc[searchx])
#endif
            {
                searchit = 1; searchsector = sectnum;
                searchbottomwall = searchwall = wallnum;
                searchstat = (nextsectnum < 0) ? 0 : 4;
            }
        }

#ifdef ENGINE_SCREENSHOT_DEBUG
        if (engine_screenshot)
# ifdef YAX_ENABLE
        if (!g_nodraw)
# endif
        {
            static char fn[32], tmpbuf[80];
            char purple = getclosestcol(255, 0, 255);
            char yellow = getclosestcol(255, 255, 0);
            char *bakframe = (char *)Xaligned_alloc(16, xdim*ydim);

            begindrawing();  //{{{
            Bmemcpy(bakframe, (char *)frameplace, xdim*ydim);
            for (x=0; x<xdim; x++)
            {
                if (umost[x] > dmost[x])
                {
                    *((char *)frameplace + (ydim/2)*bytesperline + x) = yellow;
                    *((char *)frameplace + (ydim/2+1)*bytesperline + x) = purple;
                    continue;
                }

                if (umost[x] >= 0 && umost[x] < ydim)
                    *((char *)frameplace + umost[x]*bytesperline + x) = purple;

                if (dmost[x]-1 >= 0 && dmost[x]-1 < ydim)
                    *((char *)frameplace + (dmost[x]-1)*bytesperline + x) = yellow;
            }

            Bsprintf(tmpbuf, "nmp%d l%d b%d s%d w%d", yax_nomaskpass, yax_globallev-YAX_MAXDRAWS,
                     yax_globalbunch, sectnum, wallnum);
            printext256(8,8, whitecol,0, tmpbuf, 0);

            Bsprintf(fn, "engshot%04d.png", engine_screenshot);
            screencapture(fn, 0, "BUILD engine");
            engine_screenshot++;

            Bmemcpy((char *)frameplace, bakframe, xdim*ydim);
            enddrawing();  //}}}

            Baligned_free(bakframe);
        }
#endif
    }
}

// High-precision integer type for view-relative x and y in drawvox().
typedef zint_t voxint_t;

//
// drawvox
//
static void drawvox(int32_t dasprx, int32_t daspry, int32_t dasprz, int32_t dasprang,
                    int32_t daxscale, int32_t dayscale, char daindex,
                    int8_t dashade, char dapal, const int32_t *daumost, const int32_t *dadmost)
{
    int32_t i, j, k, x, y;

    int32_t cosang = sintable[(globalang+512)&2047];
    int32_t sinang = sintable[globalang&2047];
    int32_t sprcosang = sintable[(dasprang+512)&2047];
    int32_t sprsinang = sintable[dasprang&2047];

    i = klabs(dmulscale6(dasprx-globalposx, cosang, daspry-globalposy, sinang));
    j = getpalookup(mulscale21(globvis,i), dashade)<<8;
    setupdrawslab(ylookup[1], FP_OFF(palookup[dapal])+j);

    j = 1310720;
    j *= min(daxscale,dayscale); j >>= 6;  //New hacks (for sized-down voxels)
    for (k=0; k<MAXVOXMIPS; k++)
    {
        if (i < j) { i = k; break; }
        j <<= 1;
    }
    if (k >= MAXVOXMIPS)
        i = MAXVOXMIPS-1;

    if (novoxmips)
        i = 0;

    char *davoxptr = (char *)voxoff[daindex][i];
    if (!davoxptr && i > 0) { davoxptr = (char *)voxoff[daindex][0]; i = 0; }
    if (!davoxptr)
        return;

    if (voxscale[daindex] == 65536)
        { daxscale <<= (i+8); dayscale <<= (i+8); }
    else
    {
        daxscale = mulscale8(daxscale<<i,voxscale[daindex]);
        dayscale = mulscale8(dayscale<<i,voxscale[daindex]);
    }

    const int32_t odayscale = dayscale;
    daxscale = mulscale16(daxscale,xyaspect);
    daxscale = scale(daxscale, xdimenscale, xdimen<<8);
    dayscale = scale(dayscale, mulscale16(xdimenscale,viewingrangerecip), xdimen<<8);

    const int32_t daxscalerecip = divideu32_noinline(1<<30, daxscale);
    const int32_t dayscalerecip = divideu32_noinline(1<<30, dayscale);

    int32_t *longptr = (int32_t *)davoxptr;
    const int32_t daxsiz = B_LITTLE32(longptr[0]), daysiz = B_LITTLE32(longptr[1]); //dazsiz = B_LITTLE32(longptr[2]);
    const int32_t daxpivot = B_LITTLE32(longptr[3]), daypivot = B_LITTLE32(longptr[4]), dazpivot = B_LITTLE32(longptr[5]);
    davoxptr += (6<<2);

    x = mulscale16(globalposx-dasprx, daxscalerecip);
    y = mulscale16(globalposy-daspry, daxscalerecip);
    const int32_t backx = (dmulscale10(x,sprcosang, y,sprsinang)+daxpivot)>>8;
    const int32_t backy = (dmulscale10(y,sprcosang, x,-sprsinang)+daypivot)>>8;
    const int32_t cbackx = min(max(backx,0),daxsiz-1);
    const int32_t cbacky = min(max(backy,0),daysiz-1);

    sprcosang = mulscale14(daxscale, sprcosang);
    sprsinang = mulscale14(daxscale, sprsinang);

    x = (dasprx-globalposx) - dmulscale18(daxpivot,sprcosang, daypivot,-sprsinang);
    y = (daspry-globalposy) - dmulscale18(daypivot,sprcosang, daxpivot,sprsinang);

    cosang = mulscale16(cosang, dayscalerecip);
    sinang = mulscale16(sinang, dayscalerecip);

    const voxint_t gxstart = (voxint_t)y*cosang - (voxint_t)x*sinang;
    const voxint_t gystart = (voxint_t)x*cosang + (voxint_t)y*sinang;
    const int32_t gxinc = dmulscale10(sprsinang,cosang, sprcosang,-sinang);
    const int32_t gyinc = dmulscale10(sprcosang,cosang, sprsinang,sinang);

    x = 0; y = 0; j = max(daxsiz,daysiz);
    for (i=0; i<=j; i++)
    {
        ggxinc[i] = x; x += gxinc;
        ggyinc[i] = y; y += gyinc;
    }

    if ((klabs(globalposz-dasprz)>>10) >= klabs(odayscale))
        return;

    const int32_t syoff = divscale21(globalposz-dasprz,odayscale) + (dazpivot<<7);
    int32_t yoff = (klabs(gxinc)+klabs(gyinc))>>1;
    longptr = (int32_t *)davoxptr;
    int32_t xyvoxoffs = (daxsiz+1)<<2;

    begindrawing(); //{{{

    for (int32_t cnt=0; cnt<8; cnt++)
    {
        int32_t xs=0, ys=0, xi=0, yi=0;

        switch (cnt)
        {
        case 0:
            xs = 0;        ys = 0;        xi = 1;  yi = 1;  break;
        case 1:
            xs = daxsiz-1; ys = 0;        xi = -1; yi = 1;  break;
        case 2:
            xs = 0;        ys = daysiz-1; xi = 1;  yi = -1; break;
        case 3:
            xs = daxsiz-1; ys = daysiz-1; xi = -1; yi = -1; break;
        case 4:
            xs = 0;        ys = cbacky;   xi = 1;  yi = 2;  break;
        case 5:
            xs = daxsiz-1; ys = cbacky;   xi = -1; yi = 2;  break;
        case 6:
            xs = cbackx;   ys = 0;        xi = 2;  yi = 1;  break;
        case 7:
            xs = cbackx;   ys = daysiz-1; xi = 2;  yi = -1; break;
        }

        int32_t xe = cbackx, ye = cbacky;

        if (cnt < 4)
        {
            if ((xi < 0) && (xe >= xs)) continue;
            if ((xi > 0) && (xe <= xs)) continue;
            if ((yi < 0) && (ye >= ys)) continue;
            if ((yi > 0) && (ye <= ys)) continue;
        }
        else
        {
            if ((xi < 0) && (xe > xs)) continue;
            if ((xi > 0) && (xe < xs)) continue;
            if ((yi < 0) && (ye > ys)) continue;
            if ((yi > 0) && (ye < ys)) continue;
            xe += xi; ye += yi;
        }

        int32_t x1=0, y1=0, z1, x2=0, y2=0, z2;

        i = ksgn(ys-backy) + ksgn(xs-backx)*3 + 4;
        switch (i)
        {
        case 6:
        case 7:
            x1 = 0; y1 = 0; break;
        case 8:
        case 5:
            x1 = gxinc; y1 = gyinc; break;
        case 0:
        case 3:
            x1 = gyinc; y1 = -gxinc; break;
        case 2:
        case 1:
            x1 = gxinc+gyinc; y1 = gyinc-gxinc; break;
        }
        switch (i)
        {
        case 2:
        case 5:
            x2 = 0; y2 = 0; break;
        case 0:
        case 1:
            x2 = gxinc; y2 = gyinc; break;
        case 8:
        case 7:
            x2 = gyinc; y2 = -gxinc; break;
        case 6:
        case 3:
            x2 = gxinc+gyinc; y2 = gyinc-gxinc; break;
        }

        const char oand = pow2char[(xs<backx)+0] + pow2char[(ys<backy)+2];
        const char oand16 = oand+16;
        const char oand32 = oand+32;

        int32_t dagxinc, dagyinc;

        if (yi > 0) { dagxinc = gxinc; dagyinc = mulscale16(gyinc,viewingrangerecip); }
        else { dagxinc = -gxinc; dagyinc = -mulscale16(gyinc,viewingrangerecip); }

        //Fix for non 90 degree viewing ranges
        const int32_t nxoff = mulscale16(x2-x1,viewingrangerecip);
        x1 = mulscale16(x1, viewingrangerecip);

        const voxint_t ggxstart = gxstart + ggyinc[ys];
        const voxint_t ggystart = gystart - ggxinc[ys];

        for (x=xs; x!=xe; x+=xi)
        {
            const intptr_t slabxoffs = (intptr_t)&davoxptr[B_LITTLE32(longptr[x])];
            int16_t *const shortptr = (int16_t *)&davoxptr[((x*(daysiz+1))<<1) + xyvoxoffs];

            voxint_t nx = mulscale16z(ggxstart+ggxinc[x], viewingrangerecip) + x1;
            voxint_t ny = ggystart + ggyinc[x];

            for (y=ys; y!=ye; y+=yi,nx+=dagyinc,ny-=dagxinc)
            {
                if (ny <= nytooclose || ny >= nytoofar)
                    continue;

                char *voxptr = (char *)(B_LITTLE16(shortptr[y])+slabxoffs);
                char *const voxend = (char *)(B_LITTLE16(shortptr[y+1])+slabxoffs);
                if (voxptr == voxend)
                    continue;

                // AMCTC V1 MEGABASE: (ny+y1)>>14 == 65547
                // (after long corridor with the blinds)
                //
                // Also, OOB (<0?) in my amcvoxels_crash.map.
                const int32_t il = clamp((ny+y1)>>14, 1, DISTRECIPSIZ-1);
                int32_t lx = mulscale32(nx>>3, distrecip[il]) + halfxdimen;
                if (lx < 0)
                    lx = 0;

                const int32_t ir = clamp((ny+y2)>>14, 1, DISTRECIPSIZ-1);
                int32_t rx = mulscale32((nx+nxoff)>>3, distrecip[ir]) + halfxdimen;
                if (rx > xdimen)
                    rx = xdimen;

                if (rx <= lx)
                    continue;

                rx -= lx;

                const int32_t l1 = distrecip[clamp((ny-yoff)>>14, 1, DISTRECIPSIZ-1)];
                // FIXME! AMCTC RC2/beta shotgun voxel
                // (e.g. training map right after M16 shooting):
                const int32_t l2 = distrecip[clamp((ny+yoff)>>14, 1, DISTRECIPSIZ-1)];

                for (; voxptr<voxend; voxptr+=voxptr[1]+3)
                {
                    j = (voxptr[0]<<15)-syoff;

                    if (j < 0)
                    {
                        k = j+(voxptr[1]<<15);
                        if (k < 0)
                        {
                            if ((voxptr[2]&oand32) == 0) continue;
                            z2 = mulscale32(l2,k) + globalhoriz;     //Below slab
                        }
                        else
                        {
                            if ((voxptr[2]&oand) == 0) continue;    //Middle of slab
                            z2 = mulscale32(l1,k) + globalhoriz;
                        }
                        z1 = mulscale32(l1,j) + globalhoriz;
                    }
                    else
                    {
                        if ((voxptr[2]&oand16) == 0) continue;
                        z1 = mulscale32(l2,j) + globalhoriz;        //Above slab
                        z2 = mulscale32(l1,j+(voxptr[1]<<15)) + globalhoriz;
                    }

                    int32_t yplc, yinc=0;

                    if (voxptr[1] == 1)
                    {
                        yplc = 0; yinc = 0;
                        if (z1 < daumost[lx])
                            z1 = daumost[lx];
                    }
                    else
                    {
                        if (z2-z1 >= 1024)
                            yinc = divscale16(voxptr[1], z2-z1);
                        else if (z2 > z1)
                            yinc = lowrecip[z2-z1]*voxptr[1]>>8;

                        if (z1 < daumost[lx]) { yplc = yinc*(daumost[lx]-z1); z1 = daumost[lx]; }
                        else yplc = 0;
                    }

                    if (z2 > dadmost[lx])
                        z2 = dadmost[lx];
                    z2 -= z1;
                    if (z2 <= 0)
                        continue;

                    drawslab(rx, yplc, z2, yinc, (intptr_t)&voxptr[3], ylookup[z1]+lx+frameoffset);
                }
            }
        }
    }

#if 0
    for (x=0; x<xdimen; x++)
    {
        if (daumost[x]>=0 && daumost[x]<ydimen)
            *(char *)(frameplace + x + bytesperline*daumost[x]) = editorcolors[13];
        if (dadmost[x]>=0 && dadmost[x]<ydimen)
            *(char *)(frameplace + x + bytesperline*dadmost[x]) = editorcolors[14];
    }
#endif

    enddrawing();   //}}}
}


static void setup_globals_sprite1(const tspritetype *tspr, const sectortype *sec,
                                     int32_t yspan, int32_t yoff, int32_t tilenum,
                                     int32_t cstat, int32_t *z1ptr, int32_t *z2ptr)
{
    int32_t logtilesizy, tsizy;
    int32_t z1, z2 = tspr->z - ((yoff*tspr->yrepeat)<<2);

    if (cstat&128)
    {
        z2 += ((yspan*tspr->yrepeat)<<1);
        if (yspan&1) z2 += (tspr->yrepeat<<1);        //Odd yspans
    }
    z1 = z2 - ((yspan*tspr->yrepeat)<<2);

    globalorientation = 0;
    globalpicnum = tilenum;
    if ((unsigned)globalpicnum >= MAXTILES) globalpicnum = 0;
    // sprite panning
    globalxpanning = (((256-spriteext[tspr->owner].xpanning)&255) * tilesiz[globalpicnum].x)>>8;
    globalypanning = 0;

    globvis = globalvisibility;
    if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));

    logtilesizy = (picsiz[globalpicnum]>>4);
    tsizy = tilesiz[globalpicnum].y;

    globalshiftval = logtilesizy;
#if !defined CLASSIC_NONPOW2_YSIZE_SPRITES
    // before proper non-power-of-two tilesizy drawing
    if (pow2long[logtilesizy] != tsizy)
        globalshiftval++;
#else
    // non power-of-two y size textures!
    if (pow2long[logtilesizy] != tsizy || tsizy >= 512)
    {
        globaltilesizy = tsizy;
        globalyscale = (1<<22)/(tsizy*tspr->yrepeat);
        globalshiftval = 0;
    }
    else
#endif
    {
        globalshiftval = 32-globalshiftval;
        globalyscale = divscale(512,tspr->yrepeat,globalshiftval-19);
    }

    globalzd = ((int64_t)(globalposz-z1)*globalyscale)<<8;
    if ((cstat&8) > 0)
    {
        globalyscale = -globalyscale;
        globalzd = ((int64_t)(globalposz-z2)*globalyscale)<<8;
    }

    *z1ptr = z1;
    *z2ptr = z2;
}

//
// drawsprite (internal)
//


static uint8_t falpha_to_blend(float alpha, int32_t *cstatptr, int32_t transbit1, int32_t transbit2)
{
    int32_t blendidx, cstat = *cstatptr;

    if (cstat&transbit1)
        alpha = 1.0f - (1.0f - alpha) * ((cstat&transbit2) ? 0.33f : 0.66f);

    cstat |= transbit1;
    cstat &= ~transbit2;

    blendidx = max(1, (int32_t)(alpha * (2*numalphatabs)));  // [1 .. 2*numalphatabs-1]
    if (blendidx > numalphatabs)
    {
        blendidx = 2*numalphatabs - blendidx;
        cstat |= transbit2;
    }
    // blendidx now in [1 .. numalphatabs]

    *cstatptr = cstat;
    return blendidx;
}

static inline int32_t mulscale_triple30(int32_t a, int32_t b, int32_t c)
{
    return ((int64_t)a * b * c)>>30;
}

static void drawsprite_classic(int32_t snum)
{
    int32_t x1, y1, x2, y2, i, j, k, x;
    int32_t z, zz, z1, z2, xp1, yp1, xp2, yp2;
    int32_t dax, day, dax1, dax2, y;
    int32_t vtilenum = 0;

    tspritetype *const tspr = tspriteptr[snum];

    const int32_t sectnum = tspr->sectnum;

    if (sectnum < 0)
        return;

    if (bad_tspr(tspr))
        return;

    uint8_t blendidx = tspr->blend;
    const int32_t xb = spritesxyz[snum].x;
    const int32_t yp = spritesxyz[snum].y;

    const int32_t spritenum = tspr->owner;
    const float alpha = spriteext[spritenum].alpha;

    const sectortype *const sec = &sector[sectnum];

    int32_t cstat=tspr->cstat, tilenum;

    DO_TILE_ANIM(tspr->picnum, spritenum+32768);

    if (alpha > 0.0f)
    {
        if (alpha >= 1.0f)
            return;

        if (numalphatabs != 0)
        {
            blendidx = falpha_to_blend(alpha, &cstat, 2, 512);
            tspr->cstat = cstat;
        }
        else if (alpha >= 0.33f)
        {
            if ((cstat&2) && alpha >= 0.5f) // this covers the multiplicative aspect used in the Polymodes
                cstat |= 512;

            cstat |= 2;

            if (alpha >= 0.66f)
                cstat |= 512;

            tspr->cstat = cstat;
        }
    }

    tilenum = tspr->picnum;

    if ((cstat&48)==48)
        vtilenum = tilenum; // if the game wants voxels, it gets voxels
    else if (usevoxels && tiletovox[tilenum] != -1 && !(spriteext[spritenum].flags&SPREXT_NOTMD))
    {
        vtilenum = tiletovox[tilenum];
        cstat |= 48;
    }

    if ((cstat&48) != 48)
    {
        if (spritenum < 0 || tilesiz[tilenum].x <= 0 || tilesiz[tilenum].y <= 0)
            return;
    }

    if (tspr->xrepeat <= 0 || tspr->yrepeat <= 0)
        return;

    globalpal = tspr->pal;
    if (palookup[globalpal] == NULL) globalpal = 0;    // JBF: fixes null-pointer crash
    globalshade = tspr->shade;

    if (cstat&2)
        setup_blend(blendidx, cstat&512);

    int32_t xoff = picanm[tilenum].xofs + tspr->xoffset;
    int32_t yoff = picanm[tilenum].yofs + tspr->yoffset;

    if ((cstat&48) == 0)
    {
        int32_t startum, startdm;
        int32_t linum, linuminc;

draw_as_face_sprite:
        if (yp <= (4<<8)) return;

        const int32_t siz = divscale19(xdimenscale,yp);

        const int32_t xv = mulscale16(((int32_t)tspr->xrepeat)<<16,xyaspect);

        const int32_t xspan = tilesiz[tilenum].x;
        const int32_t yspan = tilesiz[tilenum].y;

        const int32_t xsiz = mulscale30(siz,xv*xspan);
        const int32_t ysiz = mulscale14(siz,tspr->yrepeat*yspan);

        if (EDUKE32_PREDICT_FALSE((xspan>>11) >= xsiz || yspan >= (ysiz>>1)))
            return;  //Watch out for divscale overflow

        x1 = xb-(xsiz>>1);
        if (xspan&1) x1 += mulscale31(siz,xv);  //Odd xspans
        i = mulscale30(siz,xv*xoff);
        if ((cstat&4) == 0) x1 -= i; else x1 += i;

        y1 = mulscale16(tspr->z-globalposz,siz);
        y1 -= mulscale14(siz,tspr->yrepeat*yoff);
        y1 += (globalhoriz<<8)-ysiz;
        if (cstat&128)
        {
            y1 += (ysiz>>1);
            if (yspan&1) y1 += mulscale15(siz,tspr->yrepeat);  //Odd yspans
        }

        x2 = x1+xsiz-1;
        y2 = y1+ysiz-1;
        if ((y1|255) >= (y2|255)) return;

        int32_t lx = (x1>>8)+1; if (lx < 0) lx = 0;
        int32_t rx = (x2>>8); if (rx >= xdimen) rx = xdimen-1;
        if (lx > rx) return;

        if ((sec->ceilingstat&3) == 0)
            startum = globalhoriz+mulscale24(siz,sec->ceilingz-globalposz)-1;
        else
            startum = 0;
        if ((sec->floorstat&3) == 0)
            startdm = globalhoriz+mulscale24(siz,sec->floorz-globalposz)+1;
        else
            startdm = INT32_MAX;
        if ((y1>>8) > startum) startum = (y1>>8);
        if ((y2>>8) < startdm) startdm = (y2>>8);

        if (startum < -32768) startum = -32768;
        if (startdm > 32767) startdm = 32767;
        if (startum >= startdm) return;

        if ((cstat&4) == 0)
        {
            linuminc = divscale24(xspan,xsiz);
            linum = mulscale8((lx<<8)-x1,linuminc);
        }
        else
        {
            linuminc = -divscale24(xspan,xsiz);
            linum = mulscale8((lx<<8)-x2,linuminc);
        }

        if ((cstat&8) > 0)
            swaplong(&y1, &y2);

        x = lx;
#ifdef CLASSIC_SLICE_BY_4
        for (; x<=rx-4; x+=4)
        {
            uwall[x] =   max(startumost[windowx1+x]-windowy1,   (int16_t) startum);
            uwall[x+1] = max(startumost[windowx1+x+1]-windowy1, (int16_t) startum);
            uwall[x+2] = max(startumost[windowx1+x+2]-windowy1, (int16_t) startum);
            uwall[x+3] = max(startumost[windowx1+x+3]-windowy1, (int16_t) startum);

            dwall[x] =   min(startdmost[windowx1+x]-windowy1,   (int16_t) startdm);
            dwall[x+1] = min(startdmost[windowx1+x+1]-windowy1, (int16_t) startdm);
            dwall[x+2] = min(startdmost[windowx1+x+2]-windowy1, (int16_t) startdm);
            dwall[x+3] = min(startdmost[windowx1+x+3]-windowy1, (int16_t) startdm);
        }
#endif
        for (; x<=rx; x++)
        {
            uwall[x] = max(startumost[windowx1+x]-windowy1,(int16_t)startum);
            dwall[x] = min(startdmost[windowx1+x]-windowy1,(int16_t)startdm);
        }

        int32_t daclip = 0;
        for (i=smostwallcnt-1; i>=0; i--)
        {
            if (smostwalltype[i]&daclip) continue;
            j = smostwall[i];
            if ((xb1[j] > rx) || (xb2[j] < lx)) continue;
            if ((yp <= yb1[j]) && (yp <= yb2[j])) continue;
            if (spritewallfront(tspr,(int32_t)thewall[j]) && ((yp <= yb1[j]) || (yp <= yb2[j]))) continue;

            const int32_t dalx2 = max(xb1[j],lx);
            const int32_t darx2 = min(xb2[j],rx);

            switch (smostwalltype[i])
            {
            case 0:
                if (dalx2 <= darx2)
                {
                    if ((dalx2 == lx) && (darx2 == rx)) return;
                    //clearbufbyte(&dwall[dalx2],(darx2-dalx2+1)*sizeof(dwall[0]),0L);
                    for (k=dalx2; k<=darx2; k++) dwall[k] = 0;
                }
                break;
            case 1:
                k = smoststart[i] - xb1[j];
                x = dalx2;
#ifdef CLASSIC_SLICE_BY_4 // ok, this one is really by 2 ;)
                for (; x<=darx2-2; x+=2)
                {
                    if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
                    if (smost[k+x+1] > uwall[x+1]) uwall[x+1] = smost[k+x+1];
                }
#endif
                for (; x<=darx2; x++)
                    if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
                if ((dalx2 == lx) && (darx2 == rx)) daclip |= 1;
                break;
            case 2:
                k = smoststart[i] - xb1[j];
                x = dalx2;
#ifdef CLASSIC_SLICE_BY_4
                for (; x<=darx2-4; x+=4)
                {
                    if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
                    if (smost[k+x+1] < dwall[x+1]) dwall[x+1] = smost[k+x+1];
                    if (smost[k+x+2] < dwall[x+2]) dwall[x+2] = smost[k+x+2];
                    if (smost[k+x+3] < dwall[x+3]) dwall[x+3] = smost[k+x+3];
                }
#endif
                for (; x<=darx2; x++)
                    if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
                if ((dalx2 == lx) && (darx2 == rx)) daclip |= 2;
                break;
            }
        }

        if (uwall[rx] >= dwall[rx])
        {
            for (x=lx; x<rx; x++)
                if (uwall[x] < dwall[x]) break;
            if (x == rx) return;
        }

        //sprite
#ifdef YAX_ENABLE
        if (yax_globallev==YAX_MAXDRAWS || searchit==2)
#endif
        if (searchit >= 1 && (searchx >= lx && searchx <= rx))
            if (searchy >= uwall[searchx] && searchy < dwall[searchx])
            {
                searchsector = sectnum; searchwall = spritenum;
                searchstat = 3; searchit = 1;
            }

        setup_globals_sprite1(tspr, sec, yspan, yoff, tilenum, cstat, &z1, &z2);

        qinterpolatedown16((intptr_t)&lwall[lx],rx-lx+1,linum,linuminc);
        clearbuf(&swall[lx],rx-lx+1,mulscale19(yp,xdimscale));

        {
#ifdef HIGH_PRECISION_SPRITE
            union { float f; int32_t i; } sw = {
                // initialize the float of the union
                ((cstat&8) ? -1 : 1)
                * (float)yp * xdimscale
                * (1<<(22-19)) / (yspan*tspr->yrepeat)
            };

            clearbuf(&swallf[lx], rx-lx+1, sw.i);
#endif
        }

        drawing_sprite = 1;

        if ((cstat&2) == 0)
            maskwallscan(lx,rx, (cstat&8)==0);
        else
            transmaskwallscan(lx,rx, (cstat&8)==0);

        drawing_sprite = 0;
    }
    else if ((cstat&48) == 16)
    {
        const int32_t xspan = tilesiz[tilenum].x;
        const int32_t yspan = tilesiz[tilenum].y;
        const int32_t xv = tspr->xrepeat*sintable[(tspr->ang+2560+1536)&2047];
        const int32_t yv = tspr->xrepeat*sintable[(tspr->ang+2048+1536)&2047];

        if ((cstat&4) > 0) xoff = -xoff;
        if ((cstat&8) > 0) yoff = -yoff;

        i = (xspan>>1) + xoff;
        x1 = tspr->x-globalposx-mulscale16(xv,i); x2 = x1+mulscale16(xv,xspan);
        y1 = tspr->y-globalposy-mulscale16(yv,i); y2 = y1+mulscale16(yv,xspan);

        vec2_t p1 = get_rel_coords(x1, y1);
        vec2_t p2 = get_rel_coords(x2, y2);

        if (p1.y <= 0 && p2.y <= 0)
            return;

        x1 += globalposx; y1 += globalposy;
        x2 += globalposx; y2 += globalposy;

        int32_t swapped = 0;
        if (dmulscale32(p1.x, p2.y, -p2.x, p1.y) >= 0)  // If wall's NOT facing you
        {
            if ((cstat&64) != 0)
                return;

            const vec2_t pt = p2;
            p2 = p1;
            p1 = pt;
            i = x1, x1 = x2, x2 = i;
            i = y1, y1 = y2, y2 = i;
            swapped = 1;
        }

        int32_t sx1, sx2, sy1, sy2;
        if (!get_screen_coords(p1, p2, &sx1, &sy1, &sx2, &sy2))
            return;

        const int32_t topinc = -mulscale10(p1.y,xspan);
        int32_t top = ((mulscale10(p1.x,xdimen) - mulscale9(sx1-halfxdimen,p1.y))*xspan)>>3;
        const int32_t botinc = (p2.y-p1.y)>>8;
        int32_t bot = mulscale11(p1.x-p2.x,xdimen) + mulscale2(sx1-halfxdimen,botinc);

        j = sx2+3;
        z = mulscale20(top,krecipasm(bot));
        lwall[sx1] = (z>>8);
        for (x=sx1+4; x<=j; x+=4)
        {
            top += topinc; bot += botinc;
            zz = z; z = mulscale20(top,krecipasm(bot));
            i = ((z+zz)>>1);
            lwall[x-3] = ((i+zz)>>9);
            lwall[x-2] = (i>>8);
            lwall[x-1] = ((i+z)>>9);
            lwall[x] = (z>>8);
        }

        if (lwall[sx1] < 0) lwall[sx1] = 0;
        if (lwall[sx2] >= xspan) lwall[sx2] = xspan-1;

        if ((swapped^((cstat&4)>0)) > 0)
        {
            j = xspan-1;
            for (x=sx1; x<=sx2; x++)
                lwall[x] = j-lwall[x];
        }

        // XXX: UNUSED?
        rx1[MAXWALLSB-1] = p1.x; ry1[MAXWALLSB-1] = p1.y;
        rx2[MAXWALLSB-1] = p2.x; ry2[MAXWALLSB-1] = p2.y;

        setup_globals_sprite1(tspr, sec, yspan, yoff, tilenum, cstat, &z1, &z2);

        if ((sec->ceilingstat&1) == 0 && z1 < sec->ceilingz)
            z1 = sec->ceilingz;
        if ((sec->floorstat&1) == 0 && z2 > sec->floorz)
            z2 = sec->floorz;

        xb1[MAXWALLSB-1] = sx1;
        xb2[MAXWALLSB-1] = sx2;
        yb1[MAXWALLSB-1] = sy1;
        yb2[MAXWALLSB-1] = sy2;
        owallmost(uwall, MAXWALLSB-1, z1-globalposz);
        owallmost(dwall, MAXWALLSB-1, z2-globalposz);

        {
            int32_t hplc = divscale19(xdimenscale,sy1);
            const int32_t hplc2 = divscale19(xdimenscale,sy2);
            const int32_t idiv = sx2-sx1;
            int32_t hinc[4] = { idiv ? tabledivide32(hplc2-hplc, idiv) : 0 };

#ifdef HIGH_PRECISION_SPRITE
            const float cc = ((1<<19)*fxdimen*(float)yxaspect) * (1.f/320.f);
            const float loopcc = ((cstat&8) ? -1 : 1)*((float)(1<<30)*(1<<24))
                / (yspan*tspr->yrepeat);
            float hplcf = cc/sy1;
            float hincf[4] = {idiv ? (cc/sy2 - hplcf)/idiv : 0};

#ifdef CLASSIC_SLICE_BY_4
            hincf[1] = hincf[0] * 2.f;
            hincf[2] = hincf[0] * 3.f;
            hincf[3] = hincf[0] * 4.f;
#endif // CLASSIC_SLICE_BY_4
#endif // HIGH_PRECISION_SPRITE
#ifdef CLASSIC_SLICE_BY_4
            hinc[1] = hinc[0]<<1;
            hinc[2] = hinc[0]*3;
            hinc[3] = hinc[0]<<2;
#endif
            i = sx1;

#ifdef CLASSIC_SLICE_BY_4
            for (; i<=sx2-4; i+=4)
            {
                swall[i] = (krecipasm(hplc)<<2);
                swall[i+1] = (krecipasm(hplc+hinc[0])<<2);
                swall[i+2] = (krecipasm(hplc+hinc[1])<<2);
                swall[i+3] = (krecipasm(hplc+hinc[2])<<2);
                hplc += hinc[3];
#ifdef HIGH_PRECISION_SPRITE
                swallf[i] =   loopcc/hplcf;
                swallf[i+1] = loopcc/(hplcf+hincf[0]);
                swallf[i+2] = loopcc/(hplcf+hincf[1]);
                swallf[i+3] = loopcc/(hplcf+hincf[2]);
                hplcf += hincf[3];
#endif // HIGH_PRECISION_SPRITE
            }
#endif // CLASSIC_SLICE_BY_4

            for (; i<=sx2; i++)
            {
                swall[i] = (krecipasm(hplc)<<2);
                hplc += hinc[0];
#ifdef HIGH_PRECISION_SPRITE
                swallf[i] = loopcc/hplcf;
                hplcf += hincf[0];
#endif
            }
        }

        for (i=smostwallcnt-1; i>=0; i--)
        {
            j = smostwall[i];

            if (xb1[j] > sx2 || xb2[j] < sx1)
                continue;

            int32_t dalx2 = xb1[j];
            int32_t darx2 = xb2[j];

            if (max(sy1,sy2) > min(yb1[j],yb2[j]))
            {
                if (min(sy1,sy2) > max(yb1[j],yb2[j]))
                {
                    x = INT32_MIN;
                }
                else
                {
                    x = thewall[j]; xp1 = wall[x].x; yp1 = wall[x].y;
                    x = wall[x].point2; xp2 = wall[x].x; yp2 = wall[x].y;

                    z1 = (xp2-xp1)*(y1-yp1) - (yp2-yp1)*(x1-xp1);
                    z2 = (xp2-xp1)*(y2-yp1) - (yp2-yp1)*(x2-xp1);
                    if ((z1^z2) >= 0)
                        x = (z1+z2);
                    else
                    {
                        z1 = (x2-x1)*(yp1-y1) - (y2-y1)*(xp1-x1);
                        z2 = (x2-x1)*(yp2-y1) - (y2-y1)*(xp2-x1);

                        if ((z1^z2) >= 0)
                            x = -(z1+z2);
                        else
                        {
                            if ((xp2-xp1)*(tspr->y-yp1) == (tspr->x-xp1)*(yp2-yp1))
                            {
                                if (wall[thewall[j]].nextsector == tspr->sectnum)
                                    x = INT32_MIN;
                                else
                                    x = INT32_MAX;
                            }
                            else
                            {
                                //INTERSECTION!
                                x = (xp1-globalposx) + scale(xp2-xp1,z1,z1-z2);
                                y = (yp1-globalposy) + scale(yp2-yp1,z1,z1-z2);

                                yp1 = dmulscale14(x,cosviewingrangeglobalang,y,sinviewingrangeglobalang);

                                if (yp1 > 0)
                                {
                                    xp1 = dmulscale14(y,cosglobalang,-x,singlobalang);

                                    x = halfxdimen + scale(xp1,halfxdimen,yp1);
                                    if (xp1 >= 0) x++;   //Fix for SIGNED divide

                                    if (z1 < 0)
                                        { if (dalx2 < x) dalx2 = x; }
                                    else
                                        { if (darx2 > x) darx2 = x; }
                                    x = INT32_MIN+1;
                                }
                                else
                                    x = INT32_MAX;
                            }
                        }
                    }
                }

                if (x < 0)
                {
                    if (dalx2 < sx1) dalx2 = sx1;
                    if (darx2 > sx2) darx2 = sx2;

                    switch (smostwalltype[i])
                    {
                    case 0:
                        if (dalx2 <= darx2)
                        {
                            if ((dalx2 == sx1) && (darx2 == sx2)) return;
                            //clearbufbyte(&dwall[dalx2],(darx2-dalx2+1)*sizeof(dwall[0]),0L);
                            for (k=dalx2; k<=darx2; k++) dwall[k] = 0;
                        }
                        break;
                    case 1:
                        k = smoststart[i] - xb1[j];
                        x = dalx2;
#ifdef CLASSIC_SLICE_BY_4
                        for (; x<=darx2-2; x+=2)
                        {
                            if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
                            if (smost[k+x+1] > uwall[x+1]) uwall[x+1] = smost[k+x+1];
                        }
#endif
                        for (; x<=darx2; x++)
                            if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
                        break;
                    case 2:
                        k = smoststart[i] - xb1[j];
                        x = dalx2;
#ifdef CLASSIC_SLICE_BY_4
                        for (; x<=darx2-4; x+=4)
                        {
                            if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
                            if (smost[k+x+1] < dwall[x+1]) dwall[x+1] = smost[k+x+1];
                            if (smost[k+x+2] < dwall[x+2]) dwall[x+2] = smost[k+x+2];
                            if (smost[k+x+3] < dwall[x+3]) dwall[x+3] = smost[k+x+3];
                        }
#endif
                        for (; x<=darx2; x++)
                            if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
                        break;
                    }
                }
            }
        }

        //sprite
#ifdef YAX_ENABLE
        if (yax_globallev==YAX_MAXDRAWS || searchit==2)
#endif
        if (searchit >= 1 && (searchx >= sx1 && searchx <= sx2))
            if (searchy >= uwall[searchx] && searchy <= dwall[searchx])
            {
                searchsector = sectnum; searchwall = spritenum;
                searchstat = 3; searchit = 1;
            }

        drawing_sprite = 1;

        if ((cstat&2) == 0)
            maskwallscan(sx1,sx2, (cstat&8)==0);
        else
            transmaskwallscan(sx1,sx2, (cstat&8)==0);

        drawing_sprite = 0;
    }
    else if ((cstat&48) == 32)
    {
        int32_t bot, cosang, sinang;

        if ((cstat&64) != 0)
            if ((globalposz > tspr->z) == ((cstat&8)==0))
                return;

        if ((cstat&4) > 0) xoff = -xoff;
        if ((cstat&8) > 0) yoff = -yoff;

        const int32_t xspan = tilesiz[tilenum].x;
        const int32_t yspan = tilesiz[tilenum].y;

        //Rotate center point
        dax = tspr->x-globalposx;
        day = tspr->y-globalposy;
        rzi[0] = dmulscale10(cosglobalang,dax,singlobalang,day);
        rxi[0] = dmulscale10(cosglobalang,day,-singlobalang,dax);

        //Get top-left corner
        i = ((tspr->ang+2048-globalang)&2047);
        cosang = sintable[(i+512)&2047]; sinang = sintable[i];
        dax = ((xspan>>1)+xoff)*tspr->xrepeat;
        day = ((yspan>>1)+yoff)*tspr->yrepeat;
        rzi[0] += dmulscale12(sinang,dax,cosang,day);
        rxi[0] += dmulscale12(sinang,day,-cosang,dax);

        //Get other 3 corners
        dax = xspan*tspr->xrepeat;
        day = yspan*tspr->yrepeat;
        rzi[1] = rzi[0]-mulscale12(sinang,dax);
        rxi[1] = rxi[0]+mulscale12(cosang,dax);
        dax = -mulscale12(cosang,day);
        day = -mulscale12(sinang,day);
        rzi[2] = rzi[1]+dax; rxi[2] = rxi[1]+day;
        rzi[3] = rzi[0]+dax; rxi[3] = rxi[0]+day;

        //Put all points on same z
        ryi[0] = scale((tspr->z-globalposz),yxaspect,320<<8);
        if (ryi[0] == 0) return;
        ryi[1] = ryi[2] = ryi[3] = ryi[0];

        if ((cstat&4) == 0)
            { z = 0; z1 = 1; z2 = 3; }
        else
            { z = 1; z1 = 0; z2 = 2; }

        dax = rzi[z1]-rzi[z]; day = rxi[z1]-rxi[z];
        bot = dmulscale8(dax,dax,day,day);
        if ((klabs(dax)>>13) >= bot || (klabs(day)>>13) >= bot)
            return;
        globalx1 = divscale18(dax,bot);
        globalx2 = divscale18(day,bot);

        dax = rzi[z2]-rzi[z]; day = rxi[z2]-rxi[z];
        bot = dmulscale8(dax,dax,day,day);
        if ((klabs(dax)>>13) >= bot || (klabs(day)>>13) >= bot)
            return;
        globaly1 = divscale18(dax,bot);
        globaly2 = divscale18(day,bot);

        //Calculate globals for hline texture mapping function
        globalxpanning = (rxi[z]<<12);
        globalypanning = (rzi[z]<<12);
        globalzd = (ryi[z]<<12);

        rzi[0] = mulscale16(rzi[0],viewingrange);
        rzi[1] = mulscale16(rzi[1],viewingrange);
        rzi[2] = mulscale16(rzi[2],viewingrange);
        rzi[3] = mulscale16(rzi[3],viewingrange);

        if (ryi[0] < 0)   //If ceilsprite is above you, reverse order of points
        {
            i = rxi[1]; rxi[1] = rxi[3]; rxi[3] = i;
            i = rzi[1]; rzi[1] = rzi[3]; rzi[3] = i;
        }


        //Clip polygon in 3-space
        int32_t npoints = 4;

        //Clip edge 1
        int32_t npoints2 = 0;
        int32_t zzsgn = rxi[0]+rzi[0], zsgn;
        for (z=0; z<npoints; z++)
        {
            zz = z+1; if (zz == npoints) zz = 0;
            zsgn = zzsgn; zzsgn = rxi[zz]+rzi[zz];
            if (zsgn >= 0)
            {
                rxi2[npoints2] = rxi[z]; ryi2[npoints2] = ryi[z]; rzi2[npoints2] = rzi[z];
                npoints2++;
            }
            if ((zsgn^zzsgn) < 0)
            {
                int32_t t = divscale30(zsgn,zsgn-zzsgn);
                rxi2[npoints2] = rxi[z] + mulscale30(t,rxi[zz]-rxi[z]);
                ryi2[npoints2] = ryi[z] + mulscale30(t,ryi[zz]-ryi[z]);
                rzi2[npoints2] = rzi[z] + mulscale30(t,rzi[zz]-rzi[z]);
                npoints2++;
            }
        }
        if (npoints2 <= 2) return;

        //Clip edge 2
        npoints = 0;
        zzsgn = rxi2[0]-rzi2[0];
        for (z=0; z<npoints2; z++)
        {
            zz = z+1; if (zz == npoints2) zz = 0;
            zsgn = zzsgn; zzsgn = rxi2[zz]-rzi2[zz];
            if (zsgn <= 0)
            {
                rxi[npoints] = rxi2[z]; ryi[npoints] = ryi2[z]; rzi[npoints] = rzi2[z];
                npoints++;
            }
            if ((zsgn^zzsgn) < 0)
            {
                int32_t t = divscale30(zsgn,zsgn-zzsgn);
                rxi[npoints] = rxi2[z] + mulscale30(t,rxi2[zz]-rxi2[z]);
                ryi[npoints] = ryi2[z] + mulscale30(t,ryi2[zz]-ryi2[z]);
                rzi[npoints] = rzi2[z] + mulscale30(t,rzi2[zz]-rzi2[z]);
                npoints++;
            }
        }
        if (npoints <= 2) return;

        //Clip edge 3
        npoints2 = 0;
        zzsgn = ryi[0]*halfxdimen + (rzi[0]*(globalhoriz-0));
        for (z=0; z<npoints; z++)
        {
            zz = z+1; if (zz == npoints) zz = 0;
            zsgn = zzsgn; zzsgn = ryi[zz]*halfxdimen + (rzi[zz]*(globalhoriz-0));
            if (zsgn >= 0)
            {
                rxi2[npoints2] = rxi[z];
                ryi2[npoints2] = ryi[z];
                rzi2[npoints2] = rzi[z];
                npoints2++;
            }
            if ((zsgn^zzsgn) < 0)
            {
                int32_t t = divscale30(zsgn,zsgn-zzsgn);
                rxi2[npoints2] = rxi[z] + mulscale30(t,rxi[zz]-rxi[z]);
                ryi2[npoints2] = ryi[z] + mulscale30(t,ryi[zz]-ryi[z]);
                rzi2[npoints2] = rzi[z] + mulscale30(t,rzi[zz]-rzi[z]);
                npoints2++;
            }
        }
        if (npoints2 <= 2) return;

        //Clip edge 4
        npoints = 0;
        zzsgn = ryi2[0]*halfxdimen + (rzi2[0]*(globalhoriz-ydimen));
        for (z=0; z<npoints2; z++)
        {
            zz = z+1; if (zz == npoints2) zz = 0;
            zsgn = zzsgn; zzsgn = ryi2[zz]*halfxdimen + (rzi2[zz]*(globalhoriz-ydimen));
            if (zsgn <= 0)
            {
                rxi[npoints] = rxi2[z];
                ryi[npoints] = ryi2[z];
                rzi[npoints] = rzi2[z];
                npoints++;
            }
            if ((zsgn^zzsgn) < 0)
            {
                int32_t t = divscale30(zsgn,zsgn-zzsgn);
                rxi[npoints] = rxi2[z] + mulscale30(t,rxi2[zz]-rxi2[z]);
                ryi[npoints] = ryi2[z] + mulscale30(t,ryi2[zz]-ryi2[z]);
                rzi[npoints] = rzi2[z] + mulscale30(t,rzi2[zz]-rzi2[z]);
                npoints++;
            }
        }
        if (npoints <= 2) return;

        //Project onto screen
        int32_t lpoint = -1, lmax = INT32_MAX;
        int32_t rpoint = -1, rmax = INT32_MIN;
        for (z=0; z<npoints; z++)
        {
            xsi[z] = scale(rxi[z],xdimen<<15,rzi[z]) + (xdimen<<15);
            ysi[z] = scale(ryi[z],xdimen<<15,rzi[z]) + (globalhoriz<<16);
            if (xsi[z] < 0) xsi[z] = 0;
            if (xsi[z] > (xdimen<<16)) xsi[z] = (xdimen<<16);
            if (ysi[z] < ((int32_t)0<<16)) ysi[z] = ((int32_t)0<<16);
            if (ysi[z] > ((int32_t)ydimen<<16)) ysi[z] = ((int32_t)ydimen<<16);
            if (xsi[z] < lmax) lmax = xsi[z], lpoint = z;
            if (xsi[z] > rmax) rmax = xsi[z], rpoint = z;
        }

        //Get uwall arrays
        for (z=lpoint; z!=rpoint; z=zz)
        {
            zz = z+1; if (zz == npoints) zz = 0;

            dax1 = ((xsi[z]+65535)>>16);
            dax2 = ((xsi[zz]+65535)>>16);
            if (dax2 > dax1)
            {
                int32_t yinc = divscale16(ysi[zz]-ysi[z],xsi[zz]-xsi[z]);
                y = ysi[z] + mulscale16((dax1<<16)-xsi[z],yinc);
                qinterpolatedown16short((intptr_t)(&uwall[dax1]),dax2-dax1,y,yinc);
            }
        }

        //Get dwall arrays
        for (; z!=lpoint; z=zz)
        {
            zz = z+1; if (zz == npoints) zz = 0;

            dax1 = ((xsi[zz]+65535)>>16);
            dax2 = ((xsi[z]+65535)>>16);
            if (dax2 > dax1)
            {
                int32_t yinc = divscale16(ysi[zz]-ysi[z],xsi[zz]-xsi[z]);
                y = ysi[zz] + mulscale16((dax1<<16)-xsi[zz],yinc);
                qinterpolatedown16short((intptr_t)(&dwall[dax1]),dax2-dax1,y,yinc);
            }
        }


        const int32_t lx = ((lmax+65535)>>16);
        const int32_t rx = min(((rmax+65535)>>16), xdim-1);
        // min(): OOB prevention. Simple test case: have a floor-aligned sprite
        // to the right of the player. Slowly rotate right toward it. When it
        // just becomes visible, the condition rx == xdim can occur.

        // Don't pointlessly keep going. If the following condition holds, the
        // ceilspritescan() at the end of our block would not draw any lines,
        // and moreover may access uwall[] OOB (with x1==xdim).
        if (rx-1 < lx)
            return;

        for (x=lx; x<=rx; x++)
        {
            uwall[x] = max(uwall[x],startumost[x+windowx1]-windowy1);
            dwall[x] = min(dwall[x],startdmost[x+windowx1]-windowy1);
        }

        //Additional uwall/dwall clipping goes here
        for (i=smostwallcnt-1; i>=0; i--)
        {
            j = smostwall[i];
            if ((xb1[j] > rx) || (xb2[j] < lx)) continue;
            if ((yp <= yb1[j]) && (yp <= yb2[j])) continue;

            //if (spritewallfront(tspr,thewall[j]) == 0)
            x = thewall[j]; xp1 = wall[x].x; yp1 = wall[x].y;
            x = wall[x].point2; xp2 = wall[x].x; yp2 = wall[x].y;
            x = (xp2-xp1)*(tspr->y-yp1)-(tspr->x-xp1)*(yp2-yp1);
            if ((yp > yb1[j]) && (yp > yb2[j])) x = -1;
            if ((x >= 0) && ((x != 0) || (wall[thewall[j]].nextsector != tspr->sectnum))) continue;

            const int32_t dalx2 = max(xb1[j],lx);
            const int32_t darx2 = min(xb2[j],rx);

            switch (smostwalltype[i])
            {
            case 0:
                if (dalx2 <= darx2)
                {
                    if ((dalx2 == lx) && (darx2 == rx)) return;
                    //clearbufbyte(&dwall[dalx2],(darx2-dalx2+1)*sizeof(dwall[0]),0L);
                    for (x=dalx2; x<=darx2; x++) dwall[x] = 0;
                }
                break;
            case 1:
                k = smoststart[i] - xb1[j];
                for (x=dalx2; x<=darx2; x++)
                    if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
                break;
            case 2:
                k = smoststart[i] - xb1[j];
                for (x=dalx2; x<=darx2; x++)
                    if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
                break;
            }
        }

        //sprite
#ifdef YAX_ENABLE
        if (yax_globallev==YAX_MAXDRAWS || searchit==2)
#endif
        if (searchit >= 1 && (searchx >= lx && searchx <= rx))
            if (searchy >= uwall[searchx] && searchy <= dwall[searchx])
            {
                searchsector = sectnum; searchwall = spritenum;
                searchstat = 3; searchit = 1;
            }

        globalorientation = cstat;
        globalpicnum = tilenum;
        if ((unsigned)globalpicnum >= (unsigned)MAXTILES) globalpicnum = 0;

        if (waloff[globalpicnum] == 0) loadtile(globalpicnum);
        setgotpic(globalpicnum);
        globalbufplc = waloff[globalpicnum];

        globvis = mulscale16(globalhisibility,viewingrange);
        if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));

        x = picsiz[globalpicnum]; y = ((x>>4)&15); x &= 15;
#if 0
        if (pow2long[x] != xspan)
        {
            x++;
            globalx1 = mulscale(globalx1,xspan,x);
            globalx2 = mulscale(globalx2,xspan,x);
        }
#endif
        dax = globalxpanning; day = globalypanning;
        globalxpanning = -dmulscale6(globalx1,day,globalx2,dax);
        globalypanning = -dmulscale6(globaly1,day,globaly2,dax);

        globalx2 = mulscale16(globalx2,viewingrange);
        globaly2 = mulscale16(globaly2,viewingrange);
        globalzd = mulscale16(globalzd,viewingrangerecip);

        globalx1 = (globalx1-globalx2)*halfxdimen;
        globaly1 = (globaly1-globaly2)*halfxdimen;

        if ((cstat&2) == 0)
            msethlineshift(x,y);
        else
            tsethlineshift(x,y);

        globalispow2 = (pow2long[x]==xspan && pow2long[y]==yspan);
        globalxspan = xspan;
        globalyspan = yspan;

        //Draw it!
        ceilspritescan(lx,rx-1);
        globalispow2 = 1;
    }
    else if ((cstat&48) == 48)
    {
        const int32_t daxrepeat = ((sprite[spritenum].cstat&48)==16) ?
            (tspr->xrepeat * 5) / 4 :
            tspr->xrepeat;

        const int32_t lx = 0, rx = xdim-1;

        for (x=lx; x<=rx; x++)
        {
            lwall[x] = startumost[x+windowx1]-windowy1;
            swall[x] = startdmost[x+windowx1]-windowy1;
        }
        for (i=smostwallcnt-1; i>=0; i--)
        {
            j = smostwall[i];
            if ((xb1[j] > rx) || (xb2[j] < lx)) continue;
            if ((yp <= yb1[j]) && (yp <= yb2[j])) continue;
            if (spritewallfront(tspr,(int32_t)thewall[j]) && ((yp <= yb1[j]) || (yp <= yb2[j]))) continue;

            const int32_t dalx2 = max(xb1[j],lx);
            const int32_t darx2 = min(xb2[j],rx);

            switch (smostwalltype[i])
            {
            case 0:
                if (dalx2 <= darx2)
                {
                    if ((dalx2 == lx) && (darx2 == rx)) return;
                    //clearbufbyte(&swall[dalx2],(darx2-dalx2+1)*sizeof(swall[0]),0L);
                    for (x=dalx2; x<=darx2; x++) swall[x] = 0;
                }
                break;
            case 1:
                k = smoststart[i] - xb1[j];
                x = dalx2;
#ifdef CLASSIC_SLICE_BY_4
                for (; x<=darx2-2; x+=2)
                {
                    if (smost[k+x] > lwall[x]) lwall[x] = smost[k+x];
                    if (smost[k+x+1] > lwall[x+1]) lwall[x+1] = smost[k+x+1];
                }
#endif
                for (; x<=darx2; x++)
                    if (smost[k+x] > lwall[x]) lwall[x] = smost[k+x];
                break;
            case 2:
                k = smoststart[i] - xb1[j];
                x = dalx2;
#ifdef CLASSIC_SLICE_BY_4
                for (; x<=darx2-4; x+=4)
                {
                    if (smost[k+x] < swall[x]) swall[x] = smost[k+x];
                    if (smost[k+x+1] < swall[x+1]) swall[x+1] = smost[k+x+1];
                    if (smost[k+x+2] < swall[x+2]) swall[x+2] = smost[k+x+2];
                    if (smost[k+x+3] < swall[x+3]) swall[x+3] = smost[k+x+3];
                }
#endif
                for (; x<=darx2; x++)
                    if (smost[k+x] < swall[x]) swall[x] = smost[k+x];
                break;
            }
        }

        if (lwall[rx] >= swall[rx])
        {
            for (x=lx; x<rx; x++)
                if (lwall[x] < swall[x]) break;
            if (x == rx) return;
        }
/*
        for (i=0; i<MAXVOXMIPS; i++)
            if (!voxoff[vtilenum][i])
            {
                kloadvoxel(vtilenum);
                break;
            }
*/
        const int32_t *const longptr = (int32_t *)voxoff[vtilenum][0];
        if (longptr == NULL)
        {
            globalshade = 32;
            tspr->xrepeat = tspr->yrepeat = 255;
            goto draw_as_face_sprite;
        }

        int32_t nxrepeat, nyrepeat;

        if (voxscale[vtilenum] == 65536)
        {
            nxrepeat = (daxrepeat<<16);
            nyrepeat = (((int32_t)tspr->yrepeat)<<16);
        }
        else
        {
            nxrepeat = daxrepeat*voxscale[vtilenum];
            nyrepeat = ((int32_t)tspr->yrepeat)*voxscale[vtilenum];
        }

        if (!(cstat&128)) tspr->z -= mulscale22(B_LITTLE32(longptr[5]),nyrepeat);
        yoff = /*picanm[sprite[tspr->owner].picnum].yofs +*/ tspr->yoffset;
        tspr->z -= mulscale14(yoff,nyrepeat);

        globvis = globalvisibility;
        if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));

#ifdef YAX_ENABLE
        if (yax_globallev==YAX_MAXDRAWS || searchit==2)
#endif
        if (searchit >= 1 && yp > (4<<8) && (searchy >= lwall[searchx] && searchy < swall[searchx]))
        {
            const int32_t siz = divscale19(xdimenscale,yp);
            const int32_t xv = mulscale16(nxrepeat,xyaspect);

            const int32_t xspan = ((B_LITTLE32(longptr[0])+B_LITTLE32(longptr[1]))>>1);
            const int32_t yspan = B_LITTLE32(longptr[2]);

            const int32_t xsiz = mulscale_triple30(siz, xv, xspan);
            const int32_t ysiz = mulscale_triple30(siz, nyrepeat, yspan);

            //Watch out for divscale overflow
            if (((xspan>>11) < xsiz) && (yspan < (ysiz>>1)))
            {
                x1 = xb-(xsiz>>1);
                if (xspan&1) x1 += mulscale31(siz,xv);  //Odd xspans
                i = mulscale30(siz,xv*xoff);
                if ((cstat&4) == 0) x1 -= i; else x1 += i;

                y1 = mulscale16(tspr->z-globalposz,siz);
                //y1 -= mulscale30(siz,nyrepeat*yoff);
                y1 += (globalhoriz<<8)-ysiz;
                //if (cstat&128)  //Already fixed up above
                y1 += (ysiz>>1);

                x2 = x1+xsiz-1;
                y2 = y1+ysiz-1;
                if ((y1|255) < (y2|255) && searchx >= (x1>>8)+1 && searchx <= (x2>>8))
                {
                    int32_t startum, startdm;

                    if ((sec->ceilingstat&3) == 0)
                        startum = globalhoriz+mulscale24(siz,sec->ceilingz-globalposz)-1;
                    else
                        startum = 0;

                    if ((sec->floorstat&3) == 0)
                        startdm = globalhoriz+mulscale24(siz,sec->floorz-globalposz)+1;
                    else
                        startdm = INT32_MAX;

                    //sprite
                    if (searchy >= max(startum,(y1>>8)) && searchy < min(startdm,(y2>>8)))
                    {
                        searchsector = sectnum; searchwall = spritenum;
                        searchstat = 3; searchit = 1;
                    }
                }
            }
        }

        i = (int32_t)tspr->ang+1536;
        i += spriteext[spritenum].angoff;
        drawvox(tspr->x,tspr->y,tspr->z,i,daxrepeat,(int32_t)tspr->yrepeat,vtilenum,tspr->shade,tspr->pal,lwall,swall);
    }
}

static void drawsprite(int32_t snum)
{
    switch (getrendermode())
    {
    case REND_CLASSIC:
        drawsprite_classic(snum);
        return;
#ifdef USE_OPENGL
    case REND_POLYMOST:
        polymost_drawsprite(snum);
        bglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        bglDepthFunc(GL_LESS); //NEVER,LESS,(,L)EQUAL,GREATER,(NOT,G)EQUAL,ALWAYS
//        bglDepthRange(0.0, 1.0); //<- this is more widely supported than glPolygonOffset
        return;
# ifdef POLYMER
    case REND_POLYMER:
        bglEnable(GL_ALPHA_TEST);
        bglEnable(GL_BLEND);
        polymer_drawsprite(snum);
        bglDisable(GL_BLEND);
        bglDisable(GL_ALPHA_TEST);
        return;
# endif
#endif
    }
}


//
// drawmaskwall (internal)
//
static void drawmaskwall(int16_t damaskwallcnt)
{
    int32_t i, j, k, x, z, sectnum, z1, z2, lx, rx;
    sectortype *sec, *nsec;
    walltype *wal;

    //============================================================================= //POLYMOST BEGINS
#ifdef USE_OPENGL
    if (getrendermode() == REND_POLYMOST) { polymost_drawmaskwall(damaskwallcnt); return; }
# ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
    {
        bglEnable(GL_ALPHA_TEST);
        bglEnable(GL_BLEND);

        polymer_drawmaskwall(damaskwallcnt);

        bglDisable(GL_BLEND);
        bglDisable(GL_ALPHA_TEST);

        return;
    }
#endif
#endif
    //============================================================================= //POLYMOST ENDS

    z = maskwall[damaskwallcnt];
    wal = &wall[thewall[z]];
    sectnum = thesector[z]; sec = &sector[sectnum];
    nsec = &sector[wal->nextsector];
    z1 = max(nsec->ceilingz,sec->ceilingz);
    z2 = min(nsec->floorz,sec->floorz);

    wallmost(uwall,z,sectnum,(uint8_t)0);
    wallmost(uplc,z,(int32_t)wal->nextsector,(uint8_t)0);
    for (x=xb1[z]; x<=xb2[z]; x++)
        if (uplc[x] > uwall[x])
            uwall[x] = uplc[x];
    wallmost(dwall,z,sectnum,(uint8_t)1);
    wallmost(dplc,z,(int32_t)wal->nextsector,(uint8_t)1);
    for (x=xb1[z]; x<=xb2[z]; x++)
        if (dplc[x] < dwall[x])
            dwall[x] = dplc[x];
    prepwall(z,wal);

    setup_globals_wall1(wal, wal->overpicnum);
    setup_globals_wall2(wal, sec->visibility, z1, z2);

    for (i=smostwallcnt-1; i>=0; i--)
    {
        j = smostwall[i];
        if ((xb1[j] > xb2[z]) || (xb2[j] < xb1[z])) continue;
        if (wallfront(j,z)) continue;

        lx = max(xb1[j],xb1[z]); rx = min(xb2[j],xb2[z]);

        switch (smostwalltype[i])
        {
        case 0:
            if (lx <= rx)
            {
                if ((lx == xb1[z]) && (rx == xb2[z])) return;
                //clearbufbyte(&dwall[lx],(rx-lx+1)*sizeof(dwall[0]),0L);
                for (x=lx; x<=rx; x++) dwall[x] = 0;
            }
            break;
        case 1:
            k = smoststart[i] - xb1[j];
            for (x=lx; x<=rx; x++)
                if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
            break;
        case 2:
            k = smoststart[i] - xb1[j];
            for (x=lx; x<=rx; x++)
                if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
            break;
        }
    }

    //maskwall
    if (searchit >= 1 && (searchx >= xb1[z] && searchx <= xb2[z]))
        if (searchy >= uwall[searchx] && searchy <= dwall[searchx])
        {
            searchsector = sectnum; searchbottomwall = searchwall = thewall[z];
            searchstat = 4; searchit = 1;
        }

    if ((globalorientation&128) == 0)
    {
        maskwallscan(xb1[z],xb2[z], 0);
    }
    else
    {
        if (globalorientation&128)
#ifdef NEW_MAP_FORMAT
            setup_blend(wal->blend, globalorientation&512);
#else
            setup_blend(0, globalorientation&512);
#endif
        transmaskwallscan(xb1[z],xb2[z], 0);
    }
}


//
// fillpolygon (internal)
//
static void fillpolygon(int32_t npoints)
{
    int32_t i, z, y, miny, maxy;

    // fix for bad next-point (xb1) values...
    for (z=0; z<npoints; z++)
        if ((unsigned)xb1[z] >= (unsigned)npoints)
            xb1[z] = 0;

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        polymost_fillpolygon(npoints);
        return;
    }
#endif

    // 1. Calculate y bounds.
    miny = INT32_MAX; maxy = INT32_MIN;
    for (z=npoints-1; z>=0; z--)
    {
        y = ry1[z];
        miny = min(miny,y);
        maxy = max(maxy,y);
    }

    miny >>= 12;
    maxy >>= 12;

    if (miny < 0)
        miny = 0;
    if (maxy >= ydim)
        maxy = ydim-1;

    for (i=0, y=miny; y<=maxy; y++, i++)
    {
        //They're pointers! - watch how you optimize this thing
        dotp1[y] = &smost[i*nodesperline];
        dotp2[y] = &smost[i*nodesperline + (nodesperline>>1)];
    }

    for (z=npoints-1; z>=0; z--)
    {
        const int32_t zz=xb1[z];

        // NOTE: clamp for crash prevention... :-/
        // r1874 says: "Fix more overheadmap crashes, this time with 'Last
        // Pissed Time'"
        const int32_t y1 = clamp(ry1[z], 0, (ydim<<12)-1);
        const int32_t y2 = clamp(ry1[zz], 0, (ydim<<12)-1);

        const int32_t day1 = y1>>12;
        const int32_t day2 = y2>>12;

        if (day1 != day2)
        {
            int32_t x1=rx1[z], x2=rx1[zz];
            const int32_t xinc = divscale12(x2-x1, y2-y1);

            if (day2 > day1)
            {
                x1 += mulscale12((day1<<12)+4095-y1, xinc);
                for (y=day1; y<day2; y++)
                {
                    Bassert(dotp2[y]);
                    *(dotp2[y]++) = x1>>12;
                    x1 += xinc;
                }
            }
            else
            {
                x2 += mulscale12((day2<<12)+4095-y2, xinc);
                for (y=day2; y<day1; y++)
                {
                    Bassert(dotp1[y]);
                    *(dotp1[y]++) = x2>>12;
                    x2 += xinc;
                }
            }
        }
    }

    globalx1 = mulscale16(globalx1,xyaspect);
    globaly2 = mulscale16(globaly2,xyaspect);

    {
        const int32_t oy = miny+1-(ydim>>1);
        globalposx += oy*(int64_t)globalx1;
        globalposy += oy*(int64_t)globaly2;
    }

    setuphlineasm4(asm1,asm2);

    for (i=0, y=miny; y<=maxy; y++, i++)
    {
        int16_t *const xptr = &smost[i*nodesperline];
        int16_t *const xptr2 = &smost[i*nodesperline + (nodesperline>>1)];

        const int32_t cnt = dotp1[y]-xptr;

        for (z=cnt-1; z>=0; z--)
        {
            int32_t x1, x2;
            int32_t zz, i1=0, i2=0;  // point indices (like loop z)

            for (zz=z; zz>0; zz--)
            {
                if (xptr[zz] < xptr[i1])
                    i1 = zz;
                if (xptr2[zz] < xptr2[i2])
                    i2 = zz;
            }

            x1 = xptr[i1];
            xptr[i1] = xptr[z];

            x2 = xptr2[i2]-1;
            xptr2[i2] = xptr2[z];

            if (x1 > x2)
                continue;

            if ((unsigned)x1 >= xdim+0u || (unsigned)x2 >= xdim+0u)
                continue;

            if (globalpolytype < 1)
            {
                //maphline
                const int32_t ox = x2+1-(xdim>>1);

                hlineasm4(x2 - x1, -1L, globalshade << 8,
                          ox * asm2 - globalposy, ox * asm1 + globalposx,
                          ylookup[y] + x2 + frameplace);
            }
            else
            {
                //maphline
                const int32_t ox = x1+1-(xdim>>1);
                const int32_t bx = ox*asm1 + globalposx;
                const int32_t by = ox*asm2 - globalposy;

                const intptr_t p = ylookup[y]+x1+frameplace;

                if (globalpolytype == 1)
                    mhline(globalbufplc,bx,(x2-x1)<<16,0L,by,p);
                else
                    thline(globalbufplc,bx,(x2-x1)<<16,0L,by,p);
            }
        }

        globalposx += (int64_t)globalx1;
        globalposy += (int64_t)globaly2;
    }

    faketimerhandler();
}

static inline int32_t addscaleclamp(int32_t a, int32_t b, int32_t s1, int32_t s2)
{
    // a + scale(b, s1, s1-s2), but without arithmetic exception when the
    // scale() expression overflows

    int64_t tmp = (int64_t)a + tabledivide64((int64_t)b*s1, s1-s2);

    if (EDUKE32_PREDICT_FALSE(tmp <= INT32_MIN+1))
        return INT32_MIN+1;
    if (EDUKE32_PREDICT_FALSE(tmp >= INT32_MAX))
        return INT32_MAX;
    return tmp;
}

//
// clippoly (internal)
//
static int32_t clippoly(int32_t npoints, int32_t clipstat)
{
    int32_t z, zz, s1, s2, t, npoints2, start2, z1, z2, z3, z4, splitcnt;
    int32_t cx1, cy1, cx2, cy2;

    cx1 = windowx1;
    cy1 = windowy1;
    cx2 = windowx2+1;
    cy2 = windowy2+1;
    cx1 <<= 12; cy1 <<= 12; cx2 <<= 12; cy2 <<= 12;

    if (clipstat&0xa)   //Need to clip top or left
    {
        npoints2 = 0; start2 = 0; z = 0; splitcnt = 0;
        do
        {
            s2 = cx1-rx1[z];
            do
            {
                zz = xb1[z]; xb1[z] = -1;
                s1 = s2; s2 = cx1-rx1[zz];
                if (s1 < 0)
                {
                    rx2[npoints2] = rx1[z]; ry2[npoints2] = ry1[z];
                    xb2[npoints2] = npoints2+1; npoints2++;
                }
                if ((s1^s2) < 0)
                {
                    rx2[npoints2] = addscaleclamp(rx1[z], rx1[zz]-rx1[z], s1, s2);
                    ry2[npoints2] = addscaleclamp(ry1[z], ry1[zz]-ry1[z], s1, s2);
                    if (s1 < 0) bunchp2[splitcnt++] = npoints2;
                    xb2[npoints2] = npoints2+1;
                    npoints2++;
                }
                z = zz;
            }
            while (xb1[z] >= 0);

            if (npoints2 >= start2+3)
                xb2[npoints2-1] = start2, start2 = npoints2;
            else
                npoints2 = start2;

            z = 1;
            while ((z < npoints) && (xb1[z] < 0)) z++;
        }
        while (z < npoints);
        if (npoints2 <= 2) return(0);

        for (z=1; z<splitcnt; z++)
            for (zz=0; zz<z; zz++)
            {
                z1 = bunchp2[z]; z2 = xb2[z1]; z3 = bunchp2[zz]; z4 = xb2[z3];
                s1  = klabs(rx2[z1]-rx2[z2])+klabs(ry2[z1]-ry2[z2]);
                s1 += klabs(rx2[z3]-rx2[z4])+klabs(ry2[z3]-ry2[z4]);
                s2  = klabs(rx2[z1]-rx2[z4])+klabs(ry2[z1]-ry2[z4]);
                s2 += klabs(rx2[z3]-rx2[z2])+klabs(ry2[z3]-ry2[z2]);
                if (s2 < s1)
                    { t = xb2[bunchp2[z]]; xb2[bunchp2[z]] = xb2[bunchp2[zz]]; xb2[bunchp2[zz]] = t; }
            }


        npoints = 0; start2 = 0; z = 0; splitcnt = 0;
        do
        {
            s2 = cy1-ry2[z];
            do
            {
                zz = xb2[z]; xb2[z] = -1;
                s1 = s2; s2 = cy1-ry2[zz];
                if (s1 < 0)
                {
                    rx1[npoints] = rx2[z]; ry1[npoints] = ry2[z];
                    xb1[npoints] = npoints+1; npoints++;
                }
                if ((s1^s2) < 0)
                {
                    rx1[npoints] = addscaleclamp(rx2[z], rx2[zz]-rx2[z], s1, s2);
                    ry1[npoints] = addscaleclamp(ry2[z], ry2[zz]-ry2[z], s1, s2);
                    if (s1 < 0) bunchp2[splitcnt++] = npoints;
                    xb1[npoints] = npoints+1;
                    npoints++;
                }
                z = zz;
            }
            while (xb2[z] >= 0);

            if (npoints >= start2+3)
                xb1[npoints-1] = start2, start2 = npoints;
            else
                npoints = start2;

            z = 1;
            while ((z < npoints2) && (xb2[z] < 0)) z++;
        }
        while (z < npoints2);
        if (npoints <= 2) return(0);

        for (z=1; z<splitcnt; z++)
            for (zz=0; zz<z; zz++)
            {
                z1 = bunchp2[z]; z2 = xb1[z1]; z3 = bunchp2[zz]; z4 = xb1[z3];
                s1  = klabs(rx1[z1]-rx1[z2])+klabs(ry1[z1]-ry1[z2]);
                s1 += klabs(rx1[z3]-rx1[z4])+klabs(ry1[z3]-ry1[z4]);
                s2  = klabs(rx1[z1]-rx1[z4])+klabs(ry1[z1]-ry1[z4]);
                s2 += klabs(rx1[z3]-rx1[z2])+klabs(ry1[z3]-ry1[z2]);
                if (s2 < s1)
                    { t = xb1[bunchp2[z]]; xb1[bunchp2[z]] = xb1[bunchp2[zz]]; xb1[bunchp2[zz]] = t; }
            }
    }
    if (clipstat&0x5)   //Need to clip bottom or right
    {
        npoints2 = 0; start2 = 0; z = 0; splitcnt = 0;
        do
        {
            s2 = rx1[z]-cx2;
            do
            {
                zz = xb1[z]; xb1[z] = -1;
                s1 = s2; s2 = rx1[zz]-cx2;
                if (s1 < 0)
                {
                    rx2[npoints2] = rx1[z]; ry2[npoints2] = ry1[z];
                    xb2[npoints2] = npoints2+1; npoints2++;
                }
                if ((s1^s2) < 0)
                {
                    rx2[npoints2] = addscaleclamp(rx1[z], rx1[zz]-rx1[z], s1, s2);
                    ry2[npoints2] = addscaleclamp(ry1[z], ry1[zz]-ry1[z], s1, s2);
                    if (s1 < 0) bunchp2[splitcnt++] = npoints2;
                    xb2[npoints2] = npoints2+1;
                    npoints2++;
                }
                z = zz;
            }
            while (xb1[z] >= 0);

            if (npoints2 >= start2+3)
                xb2[npoints2-1] = start2, start2 = npoints2;
            else
                npoints2 = start2;

            z = 1;
            while ((z < npoints) && (xb1[z] < 0)) z++;
        }
        while (z < npoints);
        if (npoints2 <= 2) return(0);

        for (z=1; z<splitcnt; z++)
            for (zz=0; zz<z; zz++)
            {
                z1 = bunchp2[z]; z2 = xb2[z1]; z3 = bunchp2[zz]; z4 = xb2[z3];
                s1  = klabs(rx2[z1]-rx2[z2])+klabs(ry2[z1]-ry2[z2]);
                s1 += klabs(rx2[z3]-rx2[z4])+klabs(ry2[z3]-ry2[z4]);
                s2  = klabs(rx2[z1]-rx2[z4])+klabs(ry2[z1]-ry2[z4]);
                s2 += klabs(rx2[z3]-rx2[z2])+klabs(ry2[z3]-ry2[z2]);
                if (s2 < s1)
                    { t = xb2[bunchp2[z]]; xb2[bunchp2[z]] = xb2[bunchp2[zz]]; xb2[bunchp2[zz]] = t; }
            }


        npoints = 0; start2 = 0; z = 0; splitcnt = 0;
        do
        {
            s2 = ry2[z]-cy2;
            do
            {
                zz = xb2[z]; xb2[z] = -1;
                s1 = s2; s2 = ry2[zz]-cy2;
                if (s1 < 0)
                {
                    rx1[npoints] = rx2[z]; ry1[npoints] = ry2[z];
                    xb1[npoints] = npoints+1; npoints++;
                }
                if ((s1^s2) < 0)
                {
                    rx1[npoints] = addscaleclamp(rx2[z], rx2[zz]-rx2[z], s1, s2);
                    ry1[npoints] = addscaleclamp(ry2[z], ry2[zz]-ry2[z], s1, s2);
                    if (s1 < 0) bunchp2[splitcnt++] = npoints;
                    xb1[npoints] = npoints+1;
                    npoints++;
                }
                z = zz;
            }
            while (xb2[z] >= 0);

            if (npoints >= start2+3)
                xb1[npoints-1] = start2, start2 = npoints;
            else
                npoints = start2;

            z = 1;
            while ((z < npoints2) && (xb2[z] < 0)) z++;
        }
        while (z < npoints2);
        if (npoints <= 2) return(0);

        for (z=1; z<splitcnt; z++)
            for (zz=0; zz<z; zz++)
            {
                z1 = bunchp2[z]; z2 = xb1[z1]; z3 = bunchp2[zz]; z4 = xb1[z3];
                s1  = klabs(rx1[z1]-rx1[z2])+klabs(ry1[z1]-ry1[z2]);
                s1 += klabs(rx1[z3]-rx1[z4])+klabs(ry1[z3]-ry1[z4]);
                s2  = klabs(rx1[z1]-rx1[z4])+klabs(ry1[z1]-ry1[z4]);
                s2 += klabs(rx1[z3]-rx1[z2])+klabs(ry1[z3]-ry1[z2]);
                if (s2 < s1)
                    { t = xb1[bunchp2[z]]; xb1[bunchp2[z]] = xb1[bunchp2[zz]]; xb1[bunchp2[zz]] = t; }
            }
    }
    return(npoints);
}


//
// clippoly4 (internal)
//
//Assume npoints=4 with polygon on &nrx1,&nry1
//JBF 20031206: Thanks to Ken's hunting, s/(rx1|ry1|rx2|ry2)/n\1/ in this function
static int32_t clippoly4(int32_t cx1, int32_t cy1, int32_t cx2, int32_t cy2)
{
    int32_t n, nn, z, zz, x, x1, x2, y, y1, y2, t;

    nn = 0; z = 0;
    do
    {
        zz = ((z+1)&3);
        x1 = nrx1[z]; x2 = nrx1[zz]-x1;

        if ((cx1 <= x1) && (x1 <= cx2))
            nrx2[nn] = x1, nry2[nn] = nry1[z], nn++;

        if (x2 <= 0) x = cx2; else x = cx1;
        t = x-x1;
        if (((t-x2)^t) < 0)
            nrx2[nn] = x, nry2[nn] = nry1[z]+scale(t,nry1[zz]-nry1[z],x2), nn++;

        if (x2 <= 0) x = cx1; else x = cx2;
        t = x-x1;
        if (((t-x2)^t) < 0)
            nrx2[nn] = x, nry2[nn] = nry1[z]+scale(t,nry1[zz]-nry1[z],x2), nn++;

        z = zz;
    }
    while (z != 0);
    if (nn < 3) return(0);

    n = 0; z = 0;
    do
    {
        zz = z+1; if (zz == nn) zz = 0;
        y1 = nry2[z]; y2 = nry2[zz]-y1;

        if ((cy1 <= y1) && (y1 <= cy2))
            nry1[n] = y1, nrx1[n] = nrx2[z], n++;

        if (y2 <= 0) y = cy2; else y = cy1;
        t = y-y1;
        if (((t-y2)^t) < 0)
            nry1[n] = y, nrx1[n] = nrx2[z]+scale(t,nrx2[zz]-nrx2[z],y2), n++;

        if (y2 <= 0) y = cy1; else y = cy2;
        t = y-y1;
        if (((t-y2)^t) < 0)
            nry1[n] = y, nrx1[n] = nrx2[z]+scale(t,nrx2[zz]-nrx2[z],y2), n++;

        z = zz;
    }
    while (z != 0);
    return(n);
}


// INTERNAL helper function for classic/polymost dorotatesprite
//  sxptr, sxptr, z: in/out
//  ret_yxaspect, ret_xyaspect: out
void dorotspr_handle_bit2(int32_t *sxptr, int32_t *syptr, int32_t *z, int32_t dastat,
                          int32_t cx1_plus_cx2, int32_t cy1_plus_cy2,
                          int32_t *ret_yxaspect, int32_t *ret_xyaspect)
{
    if ((dastat & RS_AUTO) == 0)
    {
        if (!(dastat & RS_STRETCH) && 4*ydim <= 3*xdim)
        {
            *ret_yxaspect = (12<<16)/10;
            *ret_xyaspect = (10<<16)/12;
        }
        else
        {
            *ret_yxaspect = yxaspect;
            *ret_xyaspect = xyaspect;
        }

        // *sxptr and *syptr and *z are left unchanged

        return;
    }
    else
    {
        // dastat&2: Auto window size scaling
        const int32_t oxdim = xdim;
        const int32_t oydim = ydim;
        int32_t xdim = oxdim;  // SHADOWS global
        int32_t ydim = oydim;

        int32_t zoomsc, sx=*sxptr, sy=*syptr;
        int32_t ouryxaspect = yxaspect, ourxyaspect = xyaspect;

        // screen center to s[xy], 320<<16 coords.
        const int32_t normxofs = sx-(320<<15), normyofs = sy-(200<<15);

        if (!(dastat & RS_STRETCH) && 4*ydim <= 3*xdim)
        {
            if ((dastat & RS_ALIGN_MASK) == RS_ALIGN_MASK)
                ydim = scale(xdim, 3, 4);
            else
                xdim = scale(ydim, 4, 3);

            ouryxaspect = (12<<16)/10;
            ourxyaspect = (10<<16)/12;
        }

        // nasty hacks go here
        if (!(dastat & RS_NOCLIP))
        {
            const int32_t twice_midcx = cx1_plus_cx2+2;

            // screen x center to sx1, scaled to viewport
            const int32_t scaledxofs = scale(normxofs, scale(xdimen, xdim, oxdim), 320);

            int32_t xbord = 0;

            if ((dastat & RS_ALIGN_MASK) && (dastat & RS_ALIGN_MASK) != RS_ALIGN_MASK)
            {
                xbord = scale(oxdim-xdim, twice_midcx, oxdim);

                if ((dastat & RS_ALIGN_R)==0)
                    xbord = -xbord;
            }

            sx = ((twice_midcx+xbord)<<15) + scaledxofs;

            zoomsc = xdimenscale;   //= scale(xdimen,yxaspect,320);

            if ((dastat & RS_ALIGN_MASK) == RS_ALIGN_MASK)
                zoomsc = scale(zoomsc, ydim, oydim);

            sy = ((cy1_plus_cy2+2)<<15) + mulscale16(normyofs, zoomsc);
        }
        else
        {
            //If not clipping to startmosts, & auto-scaling on, as a
            //hard-coded bonus, scale to full screen instead

            sx = (xdim<<15)+32768 + scale(normxofs,xdim,320);

            zoomsc = scale(xdim, ouryxaspect, 320);
            sy = (ydim<<15)+32768 + mulscale16(normyofs, zoomsc);

            if ((dastat & RS_ALIGN_MASK) == RS_ALIGN_MASK)
                sy += (oydim-ydim)<<15;
            else if ((dastat & RS_ALIGN_MASK) == RS_ALIGN_R)
                sx += (oxdim-xdim)<<16;
            else if ((dastat & RS_ALIGN_MASK) == 0)
                sx += (oxdim-xdim)<<15;

            if (dastat & RS_CENTERORIGIN)
                sx += oxdim<<15;
        }

        *sxptr = sx;
        *syptr = sy;
        *z = mulscale16(*z, zoomsc);

        *ret_yxaspect = ouryxaspect;
        *ret_xyaspect = ourxyaspect;
    }
}


//
// dorotatesprite (internal)
//
//JBF 20031206: Thanks to Ken's hunting, s/(rx1|ry1|rx2|ry2)/n\1/ in this function
static void dorotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t picnum,
                           int8_t dashade, char dapalnum, int32_t dastat, uint8_t daalpha, uint8_t dablend,
                           int32_t cx1, int32_t cy1, int32_t cx2, int32_t cy2,
                           int32_t uniqid)
{
    // NOTE: if these are made unsigned (for safety), angled tiles may draw
    // incorrectly, showing vertical seams at intervals.
    int32_t bx, by;

    int32_t cosang, sinang, v, nextv, dax1, dax2, oy;
    int32_t i, x, y, x1, y1, x2, y2, gx1, gy1;
    intptr_t p, bufplc, palookupoffs;
    int32_t xsiz, ysiz, xoff, yoff, npoints, yplc, yinc, lx, rx;
    int32_t xv, yv, xv2, yv2;

    int32_t ouryxaspect, ourxyaspect;

    if (g_rotatespriteNoWidescreen)
    {
        dastat |= RS_STRETCH;
        dastat &= ~RS_ALIGN_MASK;
    }

    //============================================================================= //POLYMOST BEGINS
#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        polymost_dorotatesprite(sx,sy,z,a,picnum,dashade,dapalnum,dastat,daalpha,cx1,cy1,cx2,cy2,uniqid);
        return;
    }
#else
    UNREFERENCED_PARAMETER(uniqid);
#endif
    //============================================================================= //POLYMOST ENDS

    // bound clipping rectangle to screen
    if (cx1 < 0) cx1 = 0;
    else if (cx1 > xres-1) cx1 = xres-1;
    if (cy1 < 0) cy1 = 0;
    else if (cy1 > yres-1) cy1 = yres-1;
    if (cx2 < 0) cx2 = 0;
    else if (cx2 > xres-1) cx2 = xres-1;
    if (cy2 < 0) cy2 = 0;
    else if (cy2 > yres-1) cy2 = yres-1;

    xsiz = tilesiz[picnum].x;
    ysiz = tilesiz[picnum].y;

    if (dastat & RS_TOPLEFT)
    {
        // Bit 1<<4 set: origin is top left corner?
        xoff = 0;
        yoff = 0;
    }
    else
    {
        // Bit 1<<4 clear: origin is center of tile, and per-tile offset is applied.
        // TODO: split the two?
        xoff = picanm[picnum].xofs + (xsiz>>1);
        yoff = picanm[picnum].yofs + (ysiz>>1);
    }

    // Bit 1<<2: invert y
    if (dastat & RS_YFLIP)
        yoff = ysiz-yoff;

    cosang = sintable[(a+512)&2047];
    sinang = sintable[a&2047];

    dorotspr_handle_bit2(&sx, &sy, &z, dastat, cx1+cx2, cy1+cy2, &ouryxaspect, &ourxyaspect);

    xv = mulscale14(cosang,z);
    yv = mulscale14(sinang,z);
    if ((dastat&RS_AUTO) || (dastat&RS_NOCLIP) == 0) //Don't aspect unscaled perms
    {
        xv2 = mulscale16(xv,ourxyaspect);
        yv2 = mulscale16(yv,ourxyaspect);
    }
    else
    {
        xv2 = xv;
        yv2 = yv;
    }

    nry1[0] = sy - (yv*xoff + xv*yoff);
    nry1[1] = nry1[0] + yv*xsiz;
    nry1[3] = nry1[0] + xv*ysiz;
    nry1[2] = nry1[1]+nry1[3]-nry1[0];
    i = (cy1<<16); if ((nry1[0]<i) && (nry1[1]<i) && (nry1[2]<i) && (nry1[3]<i)) return;
    i = (cy2<<16); if ((nry1[0]>i) && (nry1[1]>i) && (nry1[2]>i) && (nry1[3]>i)) return;

    nrx1[0] = sx - (xv2*xoff - yv2*yoff);
    nrx1[1] = nrx1[0] + xv2*xsiz;
    nrx1[3] = nrx1[0] - yv2*ysiz;
    nrx1[2] = nrx1[1]+nrx1[3]-nrx1[0];
    i = (cx1<<16); if ((nrx1[0]<i) && (nrx1[1]<i) && (nrx1[2]<i) && (nrx1[3]<i)) return;
    i = (cx2<<16); if ((nrx1[0]>i) && (nrx1[1]>i) && (nrx1[2]>i) && (nrx1[3]>i)) return;

    gx1 = nrx1[0]; gy1 = nry1[0];   //back up these before clipping

    npoints = clippoly4(cx1<<16,cy1<<16,(cx2+1)<<16,(cy2+1)<<16);
    if (npoints < 3) return;

    lx = nrx1[0]; rx = nrx1[0];

    nextv = 0;
    for (v=npoints-1; v>=0; v--)
    {
        x1 = nrx1[v]; x2 = nrx1[nextv];
        dax1 = (x1>>16); if (x1 < lx) lx = x1;
        dax2 = (x2>>16); if (x1 > rx) rx = x1;
        if (dax1 != dax2)
        {
            y1 = nry1[v]; y2 = nry1[nextv];
            yinc = divscale16(y2-y1,x2-x1);
            if (dax2 > dax1)
            {
                yplc = y1 + mulscale16((dax1<<16)+65535-x1,yinc);
                // Assertion fails with DNF mod: in mapster32,
                // set dt_t 3864  (bike HUD, 700x220)
                // set dt_a 100
                // set dt_z 1280000  <- CRASH!
                Bassert((unsigned)dax1 < MAXXDIM && (unsigned)dax2 < MAXXDIM+1);
                qinterpolatedown16short((intptr_t)&uplc[dax1], dax2-dax1, yplc, yinc);
            }
            else
            {
                yplc = y2 + mulscale16((dax2<<16)+65535-x2,yinc);
                Bassert((unsigned)dax2 < MAXXDIM && (unsigned)dax1 < MAXXDIM+1);
                qinterpolatedown16short((intptr_t)&dplc[dax2], dax1-dax2, yplc, yinc);
            }
        }
        nextv = v;
    }

    if (waloff[picnum] == 0) loadtile(picnum);
    setgotpic(picnum);
    bufplc = waloff[picnum];

    if (palookup[dapalnum] == NULL) dapalnum = 0;
    palookupoffs = FP_OFF(palookup[dapalnum]) + (getpalookup(0, dashade)<<8);

    // Alpha handling
    if (daalpha > 0)
    {
        if (daalpha == 255)
            return;

        if (numalphatabs != 0)
        {
            dablend = falpha_to_blend((float)daalpha / 255.0f, &dastat, RS_TRANS1, RS_TRANS2);
        }
        else if (daalpha > 84)
        {
            if ((dastat & RS_TRANS1) && daalpha > 127) // this covers the multiplicative aspect used in the Polymodes
                dastat |= RS_TRANS2;

            dastat |= RS_TRANS1;

            if (daalpha > 168)
                dastat |= RS_TRANS2;
        }
    }

    i = divscale32(1L,z);
    xv = mulscale14(sinang,i);
    yv = mulscale14(cosang,i);
    if ((dastat&RS_AUTO) || (dastat&RS_NOCLIP)==0) //Don't aspect unscaled perms
    {
        yv2 = mulscale16(-xv,ouryxaspect);
        xv2 = mulscale16(yv,ouryxaspect);
    }
    else
    {
        yv2 = -xv;
        xv2 = yv;
    }

    x1 = (lx>>16);
    x2 = (rx>>16);

    oy = 0;
    x = (x1<<16)-1-gx1;
    y = (oy<<16)+65535-gy1;
    bx = dmulscale16(x,xv2,y,xv);
    by = dmulscale16(x,yv2,y,yv);

    if (dastat & RS_YFLIP)
    {
        yv = -yv;
        yv2 = -yv2;
        by = (ysiz<<16)-1-by;
    }

#if defined ENGINE_USING_A_C
    if ((dastat&RS_TRANS1)==0 && ((a&1023) == 0) && (ysiz <= 256))  //vlineasm4 has 256 high limit!
#else
    if ((dastat&RS_TRANS1) == 0)
#endif
    {
        int32_t y1ve[4], y2ve[4], u4, d4;

        if (((a&1023) == 0) && (ysiz <= 256))  //vlineasm4 has 256 high limit!
        {
            if (dastat & RS_NOMASK)
                setupvlineasm(24L);
            else
                setupmvlineasm(24L, 0);

            by <<= 8; yv <<= 8; yv2 <<= 8;

            palookupoffse[0] = palookupoffse[1] = palookupoffse[2] = palookupoffse[3] = palookupoffs;
            vince[0] = vince[1] = vince[2] = vince[3] = yv;

            for (x=x1; x<x2; x+=4)
            {
                char bad;
                int32_t xx, xend;

                bad = 15; xend = min(x2-x,4);
                for (xx=0; xx<xend; xx++)
                {
                    bx += xv2;

                    y1 = uplc[x+xx]; y2 = dplc[x+xx];
                    if ((dastat & RS_NOCLIP) == 0)
                    {
                        if (startumost[x+xx] > y1) y1 = startumost[x+xx];
                        if (startdmost[x+xx] < y2) y2 = startdmost[x+xx];
                    }
                    if (y2 <= y1) continue;

                    by += (uint32_t)yv*(y1-oy); oy = y1;

                    // Assertion would fail with DNF mod without (uint32_t) below: in mapster32,
                    // set dt_t 3864  (bike HUD, 700x220)
                    // set dt_z 16777216
                    // <Increase yxaspect by pressing [9]>  <-- CRASH!
                    // (It also fails when wrecking the bike in-game by driving into a wall.)
//                    Bassert(bx >= 0);

                    bufplce[xx] = ((uint32_t)bx>>16)*ysiz+bufplc;
                    vplce[xx] = by;
                    y1ve[xx] = y1;
                    y2ve[xx] = y2-1;
                    bad &= ~pow2char[xx];
                }

                p = x+frameplace;

                u4 = INT32_MIN;
                d4 = INT32_MAX;
                for (xx=0; xx<4; xx++)
                    if (!(bad&pow2char[xx]))
                    {
                        u4 = max(u4, y1ve[xx]);
                        d4 = min(d4, y2ve[xx]);
                    }
                // This version may access uninitialized y?ve[] values with
                // thin tiles, e.g. 3085 (MINIFONT period, 1x5):
//                u4 = max(max(y1ve[0],y1ve[1]),max(y1ve[2],y1ve[3]));
//                d4 = min(min(y2ve[0],y2ve[1]),min(y2ve[2],y2ve[3]));

                if (dastat & RS_NOMASK)
                {
                    if ((bad != 0) || (u4 >= d4))
                    {
                        if (!(bad&1)) prevlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0],vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
                        if (!(bad&2)) prevlineasm1(vince[1],palookupoffse[1],y2ve[1]-y1ve[1],vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
                        if (!(bad&4)) prevlineasm1(vince[2],palookupoffse[2],y2ve[2]-y1ve[2],vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
                        if (!(bad&8)) prevlineasm1(vince[3],palookupoffse[3],y2ve[3]-y1ve[3],vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);
                        continue;
                    }

                    if (u4 > y1ve[0]) vplce[0] = prevlineasm1(vince[0],palookupoffse[0],u4-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
                    if (u4 > y1ve[1]) vplce[1] = prevlineasm1(vince[1],palookupoffse[1],u4-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
                    if (u4 > y1ve[2]) vplce[2] = prevlineasm1(vince[2],palookupoffse[2],u4-y1ve[2]-1,vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
                    if (u4 > y1ve[3]) vplce[3] = prevlineasm1(vince[3],palookupoffse[3],u4-y1ve[3]-1,vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);

                    if (d4 >= u4) vlineasm4(d4-u4+1, (char *)(ylookup[u4]+p));

                    i = p+ylookup[d4+1];
                    if (y2ve[0] > d4) prevlineasm1(vince[0],palookupoffse[0],y2ve[0]-d4-1,vplce[0],bufplce[0],i+0);
                    if (y2ve[1] > d4) prevlineasm1(vince[1],palookupoffse[1],y2ve[1]-d4-1,vplce[1],bufplce[1],i+1);
                    if (y2ve[2] > d4) prevlineasm1(vince[2],palookupoffse[2],y2ve[2]-d4-1,vplce[2],bufplce[2],i+2);
                    if (y2ve[3] > d4) prevlineasm1(vince[3],palookupoffse[3],y2ve[3]-d4-1,vplce[3],bufplce[3],i+3);
                }
                else
                {
                    if ((bad != 0) || (u4 >= d4))
                    {
                        if (!(bad&1)) mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0],vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
                        if (!(bad&2)) mvlineasm1(vince[1],palookupoffse[1],y2ve[1]-y1ve[1],vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
                        if (!(bad&4)) mvlineasm1(vince[2],palookupoffse[2],y2ve[2]-y1ve[2],vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
                        if (!(bad&8)) mvlineasm1(vince[3],palookupoffse[3],y2ve[3]-y1ve[3],vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);
                        continue;
                    }

                    if (u4 > y1ve[0]) vplce[0] = mvlineasm1(vince[0],palookupoffse[0],u4-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
                    if (u4 > y1ve[1]) vplce[1] = mvlineasm1(vince[1],palookupoffse[1],u4-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
                    if (u4 > y1ve[2]) vplce[2] = mvlineasm1(vince[2],palookupoffse[2],u4-y1ve[2]-1,vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
                    if (u4 > y1ve[3]) vplce[3] = mvlineasm1(vince[3],palookupoffse[3],u4-y1ve[3]-1,vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);

                    if (d4 >= u4) mvlineasm4(d4-u4+1, (char *)(ylookup[u4]+p));

                    i = p+ylookup[d4+1];
                    if (y2ve[0] > d4) mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-d4-1,vplce[0],bufplce[0],i+0);
                    if (y2ve[1] > d4) mvlineasm1(vince[1],palookupoffse[1],y2ve[1]-d4-1,vplce[1],bufplce[1],i+1);
                    if (y2ve[2] > d4) mvlineasm1(vince[2],palookupoffse[2],y2ve[2]-d4-1,vplce[2],bufplce[2],i+2);
                    if (y2ve[3] > d4) mvlineasm1(vince[3],palookupoffse[3],y2ve[3]-d4-1,vplce[3],bufplce[3],i+3);
                }

                faketimerhandler();
            }
        }
#ifndef ENGINE_USING_A_C
        else
        {
            int32_t ny1, ny2;
            int32_t qlinemode = 0;

            if (dastat & RS_NOMASK)
            {
                if ((xv2&0x0000ffff) == 0)
                {
                    qlinemode = 1;
                    setupqrhlineasm4(0L,yv2<<16,(xv2>>16)*ysiz+(yv2>>16),palookupoffs,0L,0L);
                }
                else
                {
                    qlinemode = 0;
                    setuprhlineasm4(xv2<<16,yv2<<16,(xv2>>16)*ysiz+(yv2>>16),palookupoffs,ysiz,0L);
                }
            }
            else
                setuprmhlineasm4(xv2<<16,yv2<<16,(xv2>>16)*ysiz+(yv2>>16),palookupoffs,ysiz,0L);

            y1 = uplc[x1];
            if (((dastat & RS_NOCLIP) == 0) && startumost[x1] > y1)
                y1 = startumost[x1];
            y2 = y1;
            for (x=x1; x<x2; x++)
            {
                ny1 = uplc[x]-1; ny2 = dplc[x];
                if ((dastat & RS_NOCLIP) == 0)
                {
                    if (startumost[x]-1 > ny1) ny1 = startumost[x]-1;
                    if (startdmost[x] < ny2) ny2 = startdmost[x];
                }

                if (ny1 < ny2-1)
                {
                    if (ny1 >= y2)
                    {
                        while (y1 < y2-1)
                        {
                            y1++; if ((y1&31) == 0) faketimerhandler();

                            //x,y1
                            bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1;
                            if (dastat & RS_NOMASK)
                            {
                                if (qlinemode) qrhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L    ,by<<16,ylookup[y1]+x+frameplace);
                                else rhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                            }
                            else rmhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                        }
                        y1 = ny1;
                    }
                    else
                    {
                        while (y1 < ny1)
                        {
                            y1++; if ((y1&31) == 0) faketimerhandler();

                            //x,y1
                            bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1;
                            if (dastat & RS_NOMASK)
                            {
                                if (qlinemode) qrhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L    ,by<<16,ylookup[y1]+x+frameplace);
                                else rhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                            }
                            else rmhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                        }

                        while (y1 > ny1) lastx[y1--] = x;
                    }

                    while (y2 > ny2)
                    {
                        y2--; if ((y2&31) == 0) faketimerhandler();

                        //x,y2
                        bx += xv*(y2-oy); by += yv*(y2-oy); oy = y2;
                        if (dastat & RS_NOMASK)
                        {
                            if (qlinemode) qrhlineasm4(x-lastx[y2],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L    ,by<<16,ylookup[y2]+x+frameplace);
                            else rhlineasm4(x-lastx[y2],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y2]+x+frameplace);
                        }
                        else rmhlineasm4(x-lastx[y2],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y2]+x+frameplace);
                    }

                    while (y2 < ny2) lastx[y2++] = x;
                }
                else
                {
                    while (y1 < y2-1)
                    {
                        y1++; if ((y1&31) == 0) faketimerhandler();

                        //x,y1
                        bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1;
                        if (dastat & RS_NOMASK)
                        {
                            if (qlinemode) qrhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L    ,by<<16,ylookup[y1]+x+frameplace);
                            else rhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                        }
                        else rmhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                    }

                    if (x == x2-1) { bx += xv2; by += yv2; break; }
                    y1 = uplc[x+1];
                    if (((dastat & RS_NOCLIP) == 0) && startumost[x+1] > y1)
                        y1 = startumost[x+1];
                    y2 = y1;
                }
                bx += xv2; by += yv2;
            }

            while (y1 < y2-1)
            {
                y1++; if ((y1&31) == 0) faketimerhandler();

                //x2,y1
                bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1;
                if (dastat & RS_NOMASK)
                {
                    if (qlinemode) qrhlineasm4(x2-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L,by<<16,ylookup[y1]+x2+frameplace);
                    else rhlineasm4(x2-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x2+frameplace);
                }
                else rmhlineasm4(x2-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x2+frameplace);
            }
        }
#endif  // !defined ENGINE_USING_A_C
    }
    else
    {
        if ((dastat & RS_TRANS1) == 0)
        {
#if !defined ENGINE_USING_A_C
            if (dastat & RS_NOMASK)
                setupspritevline(palookupoffs,(xv>>16)*ysiz,xv<<16,ysiz,yv,0L);
            else
                msetupspritevline(palookupoffs,(xv>>16)*ysiz,xv<<16,ysiz,yv,0L);
#else
            if (dastat & RS_NOMASK)
                setupspritevline(palookupoffs,xv,yv,ysiz);
            else
                msetupspritevline(palookupoffs,xv,yv,ysiz);
#endif
        }
        else
        {
#if !defined ENGINE_USING_A_C
            tsetupspritevline(palookupoffs,(xv>>16)*ysiz,xv<<16,ysiz,yv,0L);
#else
            tsetupspritevline(palookupoffs,xv,yv,ysiz);
#endif
            setup_blend(dablend, dastat & RS_TRANS2);
        }

        for (x=x1; x<x2; x++)
        {
            bx += xv2; by += yv2;

            y1 = uplc[x]; y2 = dplc[x];
            if ((dastat & RS_NOCLIP) == 0)
            {
                if (startumost[x] > y1) y1 = startumost[x];
                if (startdmost[x] < y2) y2 = startdmost[x];
            }
            if (y2 <= y1) continue;

            switch (y1-oy)
            {
            case -1:
                bx -= xv; by -= yv; oy = y1; break;
            case 0:
                break;
            case 1:
                bx += xv; by += yv; oy = y1; break;
            default:
                bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1; break;
            }

            p = ylookup[y1]+x+frameplace;

            if ((dastat & RS_TRANS1) == 0)
            {
#if !defined ENGINE_USING_A_C
                if (dastat & RS_NOMASK)
                    spritevline(0L,by<<16,y2-y1+1,bx<<16,(bx>>16)*ysiz+(by>>16)+bufplc,p);
                else
                    mspritevline(0L,by<<16,y2-y1+1,bx<<16,(bx>>16)*ysiz+(by>>16)+bufplc,p);
#else
                if (dastat & RS_NOMASK)
                    spritevline(bx&65535,by&65535,y2-y1+1,(bx>>16)*ysiz+(by>>16)+bufplc,p);
                else
                    mspritevline(bx&65535,by&65535,y2-y1+1,(bx>>16)*ysiz+(by>>16)+bufplc,p);
#endif
            }
            else
            {
#if !defined ENGINE_USING_A_C
                tspritevline(0L,by<<16,y2-y1+1,bx<<16,(bx>>16)*ysiz+(by>>16)+bufplc,p);
#else
                tspritevline(bx&65535,by&65535,y2-y1+1,(bx>>16)*ysiz+(by>>16)+bufplc,p);
                //transarea += (y2-y1);
#endif
            }

            faketimerhandler();
        }
    }

    /*  if ((dastat & RS_PERM) && (origbuffermode == 0))
        {
            buffermode = obuffermode;
            setactivepage(activepage);
        }*/
}


//
// initksqrt (internal)
//
static inline void initksqrt(void)
{
    int32_t i, j, k;

    j = 1; k = 0;
    for (i=0; i<4096; i++)
    {
        if (i >= j) { j <<= 2; k++; }
        sqrtable[i] = (uint16_t)(msqrtasm((i<<18)+131072)<<1);
        shlookup[i] = (k<<1)+((10-k)<<8);
        if (i < 256) shlookup[i+4096] = ((k+6)<<1)+((10-(k+6))<<8);
    }
}


//
// dosetaspect
//
static void dosetaspect(void)
{
    int32_t i, j;

    if (xyaspect != oxyaspect)
    {
        oxyaspect = xyaspect;
        j = xyaspect*320;
        horizlookup2[horizycent-1] = divscale26(131072,j);

        for (i=0; i < horizycent-1; i++)
        {
            horizlookup[i] = divscale28(1, i-(horizycent-1));
            horizlookup2[i] = divscale14(klabs(horizlookup[i]), j);
        }

        for (i=horizycent; i < ydim*4-1; i++)
        {
            horizlookup[i] = divscale28(1, i-(horizycent-1));
            horizlookup2[i] = divscale14(klabs(horizlookup[i]), j);
        }
    }

    if (xdimen != oxdimen || viewingrange != oviewingrange)
    {
        int32_t k, x, xinc;

        no_radarang2 = 0;
        oviewingrange = viewingrange;

        xinc = mulscale32(viewingrange*320,xdimenrecip);
        x = (640<<16)-mulscale1(xinc,xdimen);

        for (i=0; i<xdimen; i++)
        {
            j = (x&65535); k = (x>>16); x += xinc;

            if (k < 0 || k >= (int32_t)ARRAY_SIZE(radarang)-1)
            {
                no_radarang2 = 1;
#ifdef DEBUGGINGAIDS
                if (editstatus)
                    initprintf("no rad2\n");
#endif
                break;
            }

            if (j != 0)
                j = mulscale16(radarang[k+1]-radarang[k], j);
            radarang2[i] = (int16_t)((radarang[k]+j)>>6);
        }

        if (xdimen != oxdimen && voxoff[0][0])
        {
            if (distrecip == NULL)
                distrecip = (uint32_t *)Xaligned_alloc(16, DISTRECIPSIZ * sizeof(uint32_t));

            if (xdimen < 1 << 11)
            {
                for (i = 1; i < DISTRECIPSIZ; i++)
                    distrecip[i] = tabledivide32(xdimen << 20, i);
            }
            else
            {
                for (i = 1; i < DISTRECIPSIZ; i++)
                    distrecip[i] = tabledivide64((uint64_t)xdimen << 20, i);
            }

            nytooclose = xdimen*2100;
        }

        oxdimen = xdimen;
    }
}


//
// loadtables (internal)
//
static inline void calcbritable(void)
{
    int32_t i, j;
    float a, b;

    for (i=0; i<16; i++)
    {
        a = 8.f / ((float)i+8.f);
        b = 255.f / powf(255.f, a);

        for (j=0; j<256; j++) // JBF 20040207: full 8bit precision
            britable[i][j] = (uint8_t) (powf((float)j, a) * b);
    }
}

#define BANG2RAD ((float)PI * (1.f/1024.f))

static int32_t loadtables(void)
{
    static char tablesloaded = 0;

    if (tablesloaded == 0)
    {
        int32_t i;

        initksqrt();

        initdivtables();

        for (i=0; i<2048; i++)
            reciptable[i] = divscale30(2048, i+2048);

        for (i=0; i<16384; i++)
        	sloptable[i] = krecipasm(i-8192);

        for (i=0; i<=512; i++)
            sintable[i] = (int16_t)(16384.f * sinf((float)i * BANG2RAD));
        for (i=513; i<1024; i++)
            sintable[i] = sintable[1024-i];
        for (i=1024; i<2048; i++)
            sintable[i] = -sintable[i-1024];

        for (i=0; i<640; i++)
            radarang[i] = (int16_t)(atanf(((float)(640-i)-0.5f) * (1.f/160.f)) * (-64.f * (1.f/BANG2RAD)));
        for (i=0; i<640; i++)
            radarang[1279-i] = -radarang[i];

#ifdef B_LITTLE_ENDIAN
        i = 0;
        if (Bcrc32((uint8_t *)sintable, sizeof(sintable), 0) != 0xee1e7aba)
            i |= 1;
        if (Bcrc32((uint8_t *)radarang, 640*sizeof(radarang[0]), 0) != 0xee893d92)
            i |= 2;

        if (i != 0)
        {
            static const char *str[3] = { "sine table", "arctangent table",
                                          "sine and arctangent tables" };
            initprintf("WARNING: Calculated %s differ%s from original!\n",
                       str[i-1], i==3 ? "" : "s");
        }
#endif
        // TABLES.DAT format:
        //kread(fil,sintable,2048*2);
        //kread(fil,radarang,640*2);
        //kread(fil,textfont,1024);
        //kread(fil,smalltextfont,1024);
        //kread(fil,britable,1024);

        calcbritable();

        tablesloaded = 1;
    }

    return 0;
}


static void alloc_palookup(int32_t pal)
{
#if defined ENGINE_USING_A_C || (defined CLASSIC_NONPOW2_YSIZE_WALLS && defined CLASSIC_NONPOW2_YSIZE_SPRITES)
    palookup[pal] = (char *)Xmalloc(numshades*256);
#else
    // The asm functions vlineasm1, mvlineasm1 (maybe others?) access the next
    // palookup[...] shade entry for tilesizy==512 tiles.
    // See DEBUG_TILESIZY_512 and the comment in a.nasm: vlineasm1.
    palookup[pal] = (char *)Xcalloc(numshades+1, 256);
#endif
}

static void maybe_alloc_palookup(int32_t palnum);

//
// loadpalette (internal)
//
static void loadpalette(void)
{
    initfastcolorlookup_scale(30, 59, 11);
    initfastcolorlookup_gridvectors();

    int32_t fil;
    if ((fil = kopen4load("palette.dat",0)) == -1)
        return;


    // PALETTE_MAIN

    if (kread_and_test(fil,palette,768))
        return kclose(fil);

    for (int k = 0; k < 768; k++)
        palette[k] <<= 2;

    initfastcolorlookup_palette(palette);

    paletteloaded |= PALETTE_MAIN;


    // PALETTE_SHADES

    if (kread_and_test(fil,&numshades,2))
        return kclose(fil);
    numshades = B_LITTLE16(numshades);

    if (numshades <= 1)
    {
        initprintf("Warning: Invalid number of shades in \"palette.dat\"!\n");
        numshades = 0;
        return kclose(fil);
    }

    // Auto-detect LameDuke. Its PALETTE.DAT doesn't have a 'numshades' 16-bit
    // int after the base palette, but starts directly with the shade tables.
    // Thus, the first two bytes will be 00 01, which is 256 if read as
    // little-endian int16_t.
    int32_t lamedukep = 0;
    if (numshades == 256)
    {
        static char const * const seekfail = "Warning: klseek() failed in loadpalette()!\n";

        uint16_t temp;
        if (kread_and_test(fil,&temp,2))
            return kclose(fil);
        temp = B_LITTLE16(temp);
        if (temp == 770) // 02 03
        {
            if (klseek(fil, -4, BSEEK_CUR) < 0)
            {
                initputs(seekfail);
                return kclose(fil);
            }

            numshades = 32;
            lamedukep = 1;
        }
        else
        {
            if (klseek(fil, -2, BSEEK_CUR) < 0)
            {
                initputs(seekfail);
                return kclose(fil);
            }
        }
    }

    // Read base shade table (palookup 0).
    maybe_alloc_palookup(0);
    if (kread_and_test(fil, palookup[0], numshades<<8))
        return kclose(fil);

    paletteloaded |= PALETTE_SHADE;


    // PALETTE_TRANSLUC

    char * const transluc = blendtable[0] = (char *)Xcalloc(256, 256);

    // Read translucency (blending) table.
    if (lamedukep)
    {
        for (int i=0; i<255; i++)
        {
            // NOTE: LameDuke's table doesn't have the last row or column (i==255).

            // Read the entries above and on the diagonal, if the table is
            // thought as being row-major.
            if (kread_and_test(fil, &transluc[256*i + i], 256-i-1))
                return kclose(fil);

            // Duplicate the entries below the diagonal.
            for (int j=0; j<i; j++)
                transluc[256*i + j] = transluc[256*j + i];
        }
    }
    else
    {
        if (kread_and_test(fil, transluc, 65536))
            return kclose(fil);
    }

    paletteloaded |= PALETTE_TRANSLUC;


    // additional blending tables

    uint8_t magic[12];
    if (!kread_and_test(fil, magic, sizeof(magic)) && !Bmemcmp(magic, "MoreBlendTab", sizeof(magic)))
    {
        uint8_t addblendtabs;
        if (kread_and_test(fil, &addblendtabs, 1))
        {
            initprintf("Warning: failed reading additional blending table count\n");
            return kclose(fil);
        }

        uint8_t blendnum;
        char *tab = (char *)Xmalloc(256*256);
        for (int i=0; i<addblendtabs; i++)
        {
            if (kread_and_test(fil, &blendnum, 1))
            {
                initprintf("Warning: failed reading additional blending table index\n");
                Bfree(tab);
                return kclose(fil);
            }

            if (getblendtab(blendnum) != NULL)
                initprintf("Warning: duplicate blending table index %3d encountered\n", blendnum);

            if (kread_and_test(fil, tab, 256*256))
            {
                initprintf("Warning: failed reading additional blending table\n");
                Bfree(tab);
                return kclose(fil);
            }

            setblendtab(blendnum, tab);
        }
        Bfree(tab);

        // Read log2 of count of alpha blending tables.
        uint8_t lognumalphatabs;
        if (!kread_and_test(fil, &lognumalphatabs, 1))
        {
            if (!(lognumalphatabs >= 1 && lognumalphatabs <= 7))
                initprintf("invalid lognumalphatabs value, must be in [1 .. 7]\n");
            else
                numalphatabs = 1<<lognumalphatabs;
        }
    }

    kclose(fil);
}

uint32_t PaletteIndexFullbrights[8];

static void E_PostLoadPalette(void)
{
    globalpal = 0;
    globalpalwritten = palookup[0];
    setpalookupaddress(globalpalwritten);

    fixtransluscence(FP_OFF(blendtable[0]));

#ifdef DEBUG_TILESIZY_512
    // Bump shade 1 by 16.
    for (int i=256; i<512; i++)
        palookup[0][i] = palookup[0][i+(16<<8)];
#endif

    // find white and black colors
    for (int i=0, j, k=0; i<256; i++)
    {
        j = palette[i*3] + palette[i*3+1] + palette[i*3+2];
        if (j > k) { k = j; whitecol = i; }
    }
    for (int i=0, j, k=768; i<256; i++)
    {
        j = palette[i*3] + palette[i*3+1] + palette[i*3+2];
        if (j < k) { k = j; blackcol = i; }
    }

    redcol = getclosestcol(255, 0, 0);

    // Bmemset(PaletteIndexFullbrights, 0, sizeof(PaletteIndexFullbrights));
    for (int c = 0; c < 255; ++c) // skipping transparent color
    {
        char const * const thispalookup = palookup[0];
        char const color = thispalookup[c];

        if (EDUKE32_PREDICT_FALSE(palette[color*3] == 0 &&
                                  palette[color*3+1] == 0 &&
                                  palette[color*3+2] == 0))
            continue; // don't consider #000000 fullbright

        for (int s = c + 256; s < 256*32; s += 256)
            if (EDUKE32_PREDICT_FALSE(thispalookup[s] != color))
                goto PostLoad_NotFullbright;

        SetPaletteIndexFullbright(c);

PostLoad_NotFullbright:
        continue; // should be optimized out
    }
}

void E_ReplaceTransparentColorWithBlack(void)
{
    for (int i=0; i<MAXPALOOKUPS; i++)
    {
        char * const thispalookup = palookup[i];
        if (thispalookup == NULL)
            continue;

        for (int j=0; j<numshades; j++)
        {
            thispalookup[(j<<8) + 255] = 255;
        }
    }

    // fix up translucency table so that transluc(255,x)
    // and transluc(x,255) is black instead of purple.
    for (int i=0; i<MAXBLENDTABS; i++)
    {
        char * const transluc = blendtable[i];
        if (transluc == NULL)
            continue;

        for (int j=0; j<255; j++)
        {
            transluc[(255<<8) + j] = transluc[(blackcol<<8) + j];
            transluc[255 + (j<<8)] = transluc[blackcol + (j<<8)];
        }
        transluc[(255<<8) + 255] = transluc[(blackcol<<8) + blackcol];
    }
}

// Load LOOKUP.DAT, which contains lookup tables and additional base palettes.
//
// <fp>: kopen4load file handle
//
// Returns:
//  - on success, 0
//  - on error, -1 (didn't read enough data)
//  - -2: error, we already wrote an error message ourselves
int32_t loadlookups(int32_t fp)
{
    uint8_t numlookups;
    char remapbuf[256];

    if (kread_and_test(fp, &numlookups, 1))
        return -1;

    for (int j=0; j<numlookups; j++)
    {
        uint8_t palnum;

        if (kread_and_test(fp, &palnum, 1))
            return -1;

        if (palnum >= 256-RESERVEDPALS)
        {
            initprintf("ERROR: attempt to load lookup at reserved pal %d\n", palnum);
            return -2;
        }

        if (kread_and_test(fp, remapbuf, 256))
            return -1;

        makepalookup(palnum, remapbuf, 0,0,0, 0);
    }

    return 0;
}

void generatefogpals(void)
{
    // Find a gap of four consecutive unused pal numbers to generate fog shade
    // tables.
    for (int32_t j=1; j<=255-3; j++)
        if (!palookup[j] && !palookup[j+1] && !palookup[j+2] && !palookup[j+3])
        {
            makepalookup(j, NULL, 60, 60, 60, 1);
            makepalookup(j+1, NULL, 60, 0, 0, 1);
            makepalookup(j+2, NULL, 0, 60, 0, 1);
            makepalookup(j+3, NULL, 0, 0, 60, 1);

            break;
        }
}

void fillemptylookups(void)
{
    // Alias remaining unused pal numbers to the base shade table.
    for (int32_t j=1; j<MAXPALOOKUPS; j++)
    {
        // If an existing lookup is identical to #0, free it.
        if (palookup[j] && palookup[j] != palookup[0] && !Bmemcmp(palookup[0], palookup[j], 256*numshades))
            removepalookup(j);

        if (!palookup[j])
            makepalookup(j, NULL, 0,0,0, 1);
    }
}


////////// SPRITE LIST MANIPULATION FUNCTIONS //////////

#ifdef NETCODE_DISABLE
# define LISTFN_STATIC static
#else
# define LISTFN_STATIC
#endif

///// sector lists of sprites /////

// insert sprite at the head of sector list, change .sectnum
LISTFN_STATIC void do_insertsprite_at_headofsect(int16_t spritenum, int16_t sectnum)
{
    int16_t ohead = headspritesect[sectnum];

    prevspritesect[spritenum] = -1;
    nextspritesect[spritenum] = ohead;
    if (ohead >= 0)
        prevspritesect[ohead] = spritenum;
    headspritesect[sectnum] = spritenum;

    sprite[spritenum].sectnum = sectnum;
}

// remove sprite 'deleteme' from its sector list
LISTFN_STATIC void do_deletespritesect(int16_t deleteme)
{
    int32_t sectnum = sprite[deleteme].sectnum;
    int32_t prev = prevspritesect[deleteme], next = nextspritesect[deleteme];

    if (headspritesect[sectnum] == deleteme)
        headspritesect[sectnum] = next;
    if (prev >= 0)
        nextspritesect[prev] = next;
    if (next >= 0)
        prevspritesect[next] = prev;
}

///// now, status lists /////

// insert sprite at head of status list, change .statnum
LISTFN_STATIC void do_insertsprite_at_headofstat(int16_t spritenum, int16_t statnum)
{
    int16_t ohead = headspritestat[statnum];

    prevspritestat[spritenum] = -1;
    nextspritestat[spritenum] = ohead;
    if (ohead >= 0)
        prevspritestat[ohead] = spritenum;
    headspritestat[statnum] = spritenum;

    sprite[spritenum].statnum = statnum;
}

// insertspritestat (internal)
LISTFN_STATIC int32_t insertspritestat(int16_t statnum)
{
    int16_t blanktouse;

    if ((statnum >= MAXSTATUS) || (headspritestat[MAXSTATUS] == -1))
        return(-1);  //list full

    // remove one sprite from the statnum-freelist
    blanktouse = headspritestat[MAXSTATUS];
    headspritestat[MAXSTATUS] = nextspritestat[blanktouse];

    // make back-link of the new freelist head point to nil
    if (headspritestat[MAXSTATUS] >= 0)
        prevspritestat[headspritestat[MAXSTATUS]] = -1;
    else
        tailspritefree = -1;

    do_insertsprite_at_headofstat(blanktouse, statnum);

    return(blanktouse);
}

// remove sprite 'deleteme' from its status list
static void do_deletespritestat(int16_t deleteme)
{
    int32_t sectnum = sprite[deleteme].statnum;
    int32_t prev = prevspritestat[deleteme], next = nextspritestat[deleteme];

    if (headspritestat[sectnum] == deleteme)
        headspritestat[sectnum] = next;
    if (prev >= 0)
        nextspritestat[prev] = next;
    if (next >= 0)
        prevspritestat[next] = prev;
}


//
// insertsprite
//
int32_t insertsprite(int16_t sectnum, int16_t statnum)
{
    // TODO: guard against bad sectnum?
    int32_t newspritenum = insertspritestat(statnum);

    if (newspritenum >= 0)
    {
        Bassert((unsigned)sectnum < MAXSECTORS);

        do_insertsprite_at_headofsect(newspritenum, sectnum);
        Numsprites++;
    }

    return newspritenum;

}

//
// deletesprite
//
int32_t deletesprite(int16_t spritenum)
{
    Bassert((sprite[spritenum].statnum == MAXSTATUS)
            == (sprite[spritenum].sectnum == MAXSECTORS));

    if (sprite[spritenum].statnum == MAXSTATUS)
        return(-1);  // already not in the world

    do_deletespritestat(spritenum);
    do_deletespritesect(spritenum);

    // (dummy) insert at tail of sector freelist, compat
    // for code that checks .sectnum==MAXSECTOR
    sprite[spritenum].sectnum = MAXSECTORS;

    // insert at tail of status freelist
    prevspritestat[spritenum] = tailspritefree;
    nextspritestat[spritenum] = -1;
    if (tailspritefree >= 0)
        nextspritestat[tailspritefree] = spritenum;
    else
        headspritestat[MAXSTATUS] = spritenum;
    sprite[spritenum].statnum = MAXSTATUS;

    tailspritefree = spritenum;
    Numsprites--;

    return 0;
}

//
// changespritesect
//
int32_t changespritesect(int16_t spritenum, int16_t newsectnum)
{
    // XXX: NOTE: MAXSECTORS is allowed
    if (newsectnum < 0 || newsectnum > MAXSECTORS)
        return(-1);
    if (sprite[spritenum].sectnum == MAXSECTORS)
        return(-1);
    if (sprite[spritenum].sectnum == newsectnum)
        return(0);

    do_deletespritesect(spritenum);
    do_insertsprite_at_headofsect(spritenum, newsectnum);

    return(0);
}

//
// changespritestat
//
int32_t changespritestat(int16_t spritenum, int16_t newstatnum)
{
    // XXX: NOTE: MAXSTATUS is allowed
    if (newstatnum < 0 || newstatnum > MAXSTATUS)
        return(-1);
    if (sprite[spritenum].statnum == MAXSTATUS)
        return(-1);  // can't set the statnum of a sprite not in the world
    if (sprite[spritenum].statnum == newstatnum)
        return(0);  // sprite already has desired statnum

    do_deletespritestat(spritenum);
    do_insertsprite_at_headofstat(spritenum, newstatnum);

    return(0);
}

//
// lintersect (internal)
//
int32_t lintersect(int32_t x1, int32_t y1, int32_t z1,
                   int32_t x2, int32_t y2, int32_t z2,
                   int32_t x3, int32_t y3, int32_t x4, int32_t y4,
                   int32_t *intx, int32_t *inty, int32_t *intz)
{
    // p1 to p2 is a line segment
    int32_t x21 = x2 - x1;
    int32_t x34 = x3 - x4;
    int32_t y21 = y2 - y1;
    int32_t y34 = y3 - y4;
    int32_t bot = x21 * y34 - y21 * x34;
    int32_t topt;

    if (bot == 0)
        return 0;
    else if (bot > 0)
    {
        int32_t x31 = x3 - x1;
        int32_t y31 = y3 - y1;

        topt = x31 * y34 - y31 * x34;

        if ((unsigned)topt >= (unsigned)bot)
            return 0;

        int32_t topu = x21 * y31 - y21 * x31;

        if ((unsigned)topu >= (unsigned)bot)
            return 0;
    }
    else
    {
        int32_t x31 = x3 - x1;
        int32_t y31 = y3 - y1;

        topt = x31 * y34 - y31 * x34;

        if ((unsigned)topt <= (unsigned)bot)
            return 0;

        int32_t topu = x21 * y31 - y21 * x31;

        if ((unsigned)topu <= (unsigned)bot)
            return 0;
    }

    int32_t t = divscale24(topt, bot);
    *intx = x1 + mulscale24(x21, t);
    *inty = y1 + mulscale24(y21, t);
    *intz = z1 + mulscale24(z2 - z1, t);

    return 1;
}

//
// rintersect (internal)
//
// returns: -1 if didn't intersect, coefficient (x3--x4 fraction)<<16 else
static int32_t rintersect(int32_t x1, int32_t y1, int32_t z1,
                          int32_t vx_, int32_t vy_, int32_t vz,
                          int32_t x3, int32_t y3, int32_t x4, int32_t y4,
                          int32_t *intx, int32_t *inty, int32_t *intz)
{
    //p1 towards p2 is a ray
    int64_t topt, topu, t;

    const int64_t vx=vx_, vy=vy_;
    const int64_t x34=x3-x4, y34=y3-y4;
    const int64_t bot = vx*y34 - vy*x34;

    if (bot == 0)
        return -1;

    if (bot >= 0)
    {
        int64_t x31=x3-x1, y31 = y3-y1;
        topt = x31*y34 - y31*x34; if (topt < 0) return -1;
        topu = vx*y31 - vy*x31; if (topu < 0 || topu >= bot) return -1;
    }
    else
    {
        int32_t x31=x3-x1, y31=y3-y1;
        topt = x31*y34 - y31*x34; if (topt > 0) return -1;
        topu = vx*y31 - vy*x31; if (topu > 0 || topu <= bot) return -1;
    }

    t = (topt<<16)/bot;
    *intx = x1 + ((vx*t)>>16);
    *inty = y1 + ((vy*t)>>16);
    *intz = z1 + ((vz*t)>>16);

    t = (topu<<16)/bot;
    Bassert((unsigned)t < 65536);

    return t;
}

int32_t rayintersect(int32_t x1, int32_t y1, int32_t z1, int32_t vx, int32_t vy, int32_t vz, int32_t x3,
                     int32_t y3, int32_t x4, int32_t y4, int32_t *intx, int32_t *inty, int32_t *intz)
{
    return (rintersect(x1, y1, z1, vx, vy, vz, x3, y3, x4, y4, intx, inty, intz) != -1);
}

//
// keepaway (internal)
//
static inline void keepaway(int32_t *x, int32_t *y, int32_t w)
{
    const int32_t x1 = clipit[w].x1, dx = clipit[w].x2-x1;
    const int32_t y1 = clipit[w].y1, dy = clipit[w].y2-y1;
    const int32_t ox = ksgn(-dy), oy = ksgn(dx);
    char first = (klabs(dx) <= klabs(dy));

    while (1)
    {
        if (dx*(*y-y1) > (*x-x1)*dy)
            return;

        if (first == 0)
            *x += ox;
        else
            *y += oy;

        first ^= 1;
    }
}


//
// raytrace (internal)
//
static inline int32_t raytrace(int32_t x3, int32_t y3, int32_t *x4, int32_t *y4)
{
    int32_t hitwall = -1;

    for (int32_t z=clipnum-1; z>=0; z--)
    {
        const int32_t x1 = clipit[z].x1, x2 = clipit[z].x2, x21 = x2-x1;
        const int32_t y1 = clipit[z].y1, y2 = clipit[z].y2, y21 = y2-y1;

        int32_t topu = x21*(y3-y1) - (x3-x1)*y21;
        if (topu <= 0)
            continue;

        if (x21*(*y4-y1) > (*x4-x1)*y21)
            continue;

        const int32_t x43 = *x4-x3;
        const int32_t y43 = *y4-y3;

        if (x43*(y1-y3) > (x1-x3)*y43)
            continue;

        if (x43*(y2-y3) <= (x2-x3)*y43)
            continue;

        const int32_t bot = x43*y21 - x21*y43;
        if (bot == 0)
            continue;

        int32_t cnt = 256, nintx, ninty;

        do
        {
            cnt--; if (cnt < 0) { *x4 = x3; *y4 = y3; return z; }
            nintx = x3 + scale(x43,topu,bot);
            ninty = y3 + scale(y43,topu,bot);
            topu--;
        }
        while (x21*(ninty-y1) <= (nintx-x1)*y21);

        if (klabs(x3-nintx)+klabs(y3-ninty) < klabs(x3-*x4)+klabs(y3-*y4))
            { *x4 = nintx; *y4 = ninty; hitwall = z; }
    }

    return hitwall;
}

//
// multi-pskies
//

psky_t * E_DefinePsky(int32_t const tilenum)
{
    for (int i = 0; i < pskynummultis; i++)
        if (multipskytile[i] == tilenum)
            return &multipsky[i];

    int32_t const newPskyID = pskynummultis++;
    multipsky = (psky_t *)Xrealloc(multipsky, pskynummultis * sizeof(psky_t));
    multipskytile = (int32_t *)Xrealloc(multipskytile, pskynummultis * sizeof(int32_t));

    psky_t * const newPsky = &multipsky[newPskyID];
    Bmemset(newPsky, 0, sizeof(psky_t));
    multipskytile[newPskyID] = tilenum;

    return newPsky;
}

//
// Exported Engine Functions
//

#if !defined _WIN32 && defined DEBUGGINGAIDS && !defined GEKKO
#ifdef GEKKO
#define __rtems__
#define _POSIX_REALTIME_SIGNALS
#endif
#include <signal.h>
static void sighandler(int sig, siginfo_t *info, void *ctx)
{
    const char *s;
    UNREFERENCED_PARAMETER(ctx);
    switch (sig)
    {
    case SIGFPE:
        switch (info->si_code)
        {
        case FPE_INTDIV:
            s = "FPE_INTDIV (integer divide by zero)"; break;
        case FPE_INTOVF:
            s = "FPE_INTOVF (integer overflow)"; break;
        case FPE_FLTDIV:
            s = "FPE_FLTDIV (floating-point divide by zero)"; break;
        case FPE_FLTOVF:
            s = "FPE_FLTOVF (floating-point overflow)"; break;
        case FPE_FLTUND:
            s = "FPE_FLTUND (floating-point underflow)"; break;
        case FPE_FLTRES:
            s = "FPE_FLTRES (floating-point inexact result)"; break;
        case FPE_FLTINV:
            s = "FPE_FLTINV (floating-point invalid operation)"; break;
        case FPE_FLTSUB:
            s = "FPE_FLTSUB (floating-point subscript out of range)"; break;
        default:
            s = "?! (unknown)"; break;
        }
        ERRprintf("Caught SIGFPE at address %p, code %s. Aborting.\n", info->si_addr, s);
        break;
    default:
        break;
    }
    abort();
}
#endif

//
// E_FatalError
//
static int32_t E_FatalError(char const * const msg)
{
    engineerrstr = msg;
    initprintf("ERROR: %s\n", engineerrstr);
    return -1;
}

//
// preinitengine
//
static int32_t preinitcalled = 0;

// #define DYNALLOC_ARRAYS

#ifdef DYNALLOC_ARRAYS
void *blockptr = NULL;
#elif !defined DEBUG_MAIN_ARRAYS
static spriteext_t spriteext_s[MAXSPRITES+MAXUNIQHUDID];
static spritesmooth_t spritesmooth_s[MAXSPRITES+MAXUNIQHUDID];
static sectortype sector_s[MAXSECTORS + M32_FIXME_SECTORS];
static walltype wall_s[MAXWALLS + M32_FIXME_WALLS];
static spritetype sprite_s[MAXSPRITES];
static tspritetype tsprite_s[MAXSPRITESONSCREEN];
#endif

int32_t preinitengine(void)
{
    char *e;
    if (initsystem()) Bexit(9);

    makeasmwriteable();

#ifdef DYNALLOC_ARRAYS
    {
        size_t i, size = 0;

        // allocate everything at once...  why not?  entries can just be added to this table
        // to allocate future arrays without further intervention
        struct
        {
            void **ptr;
            size_t size;
        }
        dynarray[] =
        {
            { (void **) &sector,           sizeof(sectortype)      *MAXSECTORS                },
            { (void **) &wall,             sizeof(walltype)        *MAXWALLS }, // +512: editor quirks. FIXME!
            { (void **) &sprite,           sizeof(spritetype)      *MAXSPRITES                },
            { (void **) &tsprite,          sizeof(spritetype)      *MAXSPRITESONSCREEN        },
            { (void **) &spriteext,        sizeof(spriteext_t)     *(MAXSPRITES+MAXUNIQHUDID) },
            { (void **) &spritesmooth,     sizeof(spritesmooth_t) *(MAXSPRITES+MAXUNIQHUDID) },
        };

        if (editstatus)
        {
            dynarray[0].size += M32_FIXME_SECTORS*sizeof(sectortype);  // join sectors needs a temp. sector
            dynarray[1].size += M32_FIXME_WALLS*sizeof(walltype);
//            Bprintf("FIXME: Allocating additional space beyond wall[] for editor bugs.\n");
        }

        for (i=0; i<(signed)ARRAY_SIZE(dynarray); i++)
            size += dynarray[i].size;

        if ((blockptr = Bcalloc(1, size)) == NULL)
            return 1;

        size = 0;

        for (i=0; i<(signed)ARRAY_SIZE(dynarray); i++)
        {
            *dynarray[i].ptr = (int8_t *)blockptr + size;
            size += dynarray[i].size;
        }
    }

#elif !defined DEBUG_MAIN_ARRAYS
    sector = sector_s;
    wall = wall_s;
    sprite = sprite_s;
    tsprite = tsprite_s;
    spriteext = spriteext_s;
    spritesmooth = spritesmooth_s;
#endif

    if ((e = Bgetenv("BUILD_NOP6")) != NULL)
        if (!Bstrcasecmp(e, "TRUE"))
        {
            Bprintf("Disabling P6 optimizations.\n");
            dommxoverlay = 0;
        }
    if (dommxoverlay) mmxoverlay();

    validmodecnt = 0;
    getvalidmodes();

    initcrc32table();

#ifdef HAVE_CLIPSHAPE_FEATURE
    clipmapinfo_init();
#endif
    preinitcalled = 1;
    return 0;
}


//
// initengine
//
int32_t initengine(void)
{
    int32_t i, j;

#if !defined _WIN32 && defined DEBUGGINGAIDS && !defined GEKKO
    struct sigaction sigact, oldact;
    memset(&sigact, 0, sizeof(sigact));
    sigact.sa_sigaction = &sighandler;
    sigact.sa_flags = SA_SIGINFO;
    sigaction(SIGFPE, &sigact, &oldact);
#endif

    if (!preinitcalled)
    {
        i = preinitengine();
        if (i) return i;
    }

#ifdef YAX_DEBUG
    u64tickspersec = (double)getu64tickspersec();
    if (u64tickspersec==0.0)
        u64tickspersec = 1.0;
#endif

    if (loadtables())
        return 1;

    xyaspect = -1;

    showinvisibility = 0;

    for (i=1; i<1024; i++)
        lowrecip[i] = ((1<<24)-1)/i;

    for (i=0; i<MAXVOXELS; i++)
        for (j=0; j<MAXVOXMIPS; j++)
        {
            voxoff[i][j] = 0L;
            voxlock[i][j] = 200;
        }
    for (i=0; i<MAXTILES; i++)
        tiletovox[i] = -1;
    clearbuf(voxscale, sizeof(voxscale)>>2, 65536);

    paletteloaded = 0;

    searchit = 0; searchstat = -1;

    totalclock = 0;
    g_visibility = 512;
    parallaxvisibility = 512;

    loadpalette();

#ifdef USE_OPENGL
    if (!hicinitcounter) hicinit();
    if (!mdinited) mdinit();
#endif

#ifdef LUNATIC
    if (L_CreateState(&g_engState, "eng", NULL))
        return E_FatalError("Failed creating engine Lua state!");

    {
        static char const * const luastr = "_LUNATIC_AUX=true; decl=require('ffi').cdef; require'defs_common'";

        if (L_RunString(&g_engState, luastr, -1, "eng"))
            return E_FatalError("Failed setting up engine Lua state");
    }
#endif

    return 0;
}

//
// E_PostInit
//

int32_t E_PostInit(void)
{
    if (!(paletteloaded & PALETTE_MAIN))
        return E_FatalError("No palette found.");
    if (!(paletteloaded & PALETTE_SHADE))
        return E_FatalError("No shade table found.");
    if (!(paletteloaded & PALETTE_TRANSLUC))
        return E_FatalError("No translucency table found.");

    E_PostLoadPalette();

    return 0;
}

//
// uninitengine
//
void uninitengine(void)
{
#ifdef USE_OPENGL
    polymost_glreset();
    hicinit();
    freeallmodels();
# ifdef POLYMER
    polymer_uninit();
# endif
#endif

    if (artfil != -1)
        kclose(artfil);

    DO_FREE_AND_NULL(pic);
    DO_FREE_AND_NULL(lookups);
    ALIGNED_FREE_AND_NULL(distrecip);

    paletteloaded = 0;

    for (int i=0; i<MAXPALOOKUPS; i++)
        if (i==0 || palookup[i] != palookup[0])
        {
            // Take care of handling aliased ^^^ cases!
            Bfree(palookup[i]);
        }
    Bmemset(palookup, 0, sizeof(palookup));

    for (int i=0; i<MAXBLENDTABS; i++)
        Bfree(blendtable[i]);
    Bmemset(blendtable, 0, sizeof(blendtable));

    for (int i=1; i<MAXBASEPALS; i++)
        Bfree(basepaltable[i]);
    Bmemset(basepaltable, 0, sizeof(basepaltable));
    basepaltable[0] = palette;

#ifdef DYNALLOC_ARRAYS
    DO_FREE_AND_NULL(blockptr);
#endif
    DO_FREE_AND_NULL(kpzbuf);
    kpzbufsiz = 0;

    uninitsystem();

    for (int i = 0; i < num_usermaphacks; i++)
    {
        Bfree(usermaphacks[i].mhkfile);
        Bfree(usermaphacks[i].title);
    }
    DO_FREE_AND_NULL(usermaphacks);
    num_usermaphacks = 0;

    DO_FREE_AND_NULL(multipsky);
    DO_FREE_AND_NULL(multipskytile);
    pskynummultis = 0;
}


//
// initspritelists
//
void initspritelists(void)
{
    int32_t i;

    // initial list state for statnum lists:
    //
    //  statnum 0: nil
    //  statnum 1: nil
    //     . . .
    //  statnum MAXSTATUS-1: nil
    //  "statnum MAXSTATUS": nil <- 0 <-> 1 <-> 2 <-> ... <-> MAXSPRITES-1 -> nil
    //
    // That is, the dummy MAXSTATUS statnum has all sprites.

    for (i=0; i<MAXSECTORS; i++)   //Init doubly-linked sprite sector lists
        headspritesect[i] = -1;
    headspritesect[MAXSECTORS] = 0;

    for (i=0; i<MAXSPRITES; i++)
    {
        prevspritesect[i] = i-1;
        nextspritesect[i] = i+1;
        sprite[i].sectnum = MAXSECTORS;
    }
    prevspritesect[0] = -1;
    nextspritesect[MAXSPRITES-1] = -1;


    for (i=0; i<MAXSTATUS; i++)   //Init doubly-linked sprite status lists
        headspritestat[i] = -1;
    headspritestat[MAXSTATUS] = 0;

    for (i=0; i<MAXSPRITES; i++)
    {
        prevspritestat[i] = i-1;
        nextspritestat[i] = i+1;
        sprite[i].statnum = MAXSTATUS;
    }
    prevspritestat[0] = -1;
    nextspritestat[MAXSPRITES-1] = -1;

    tailspritefree = MAXSPRITES-1;
    Numsprites = 0;
}


void set_globalang(int16_t ang)
{
    globalang = ang&2047;
    cosglobalang = sintable[(globalang+512)&2047];
    singlobalang = sintable[globalang&2047];
    cosviewingrangeglobalang = mulscale16(cosglobalang,viewingrange);
    sinviewingrangeglobalang = mulscale16(singlobalang,viewingrange);
}

//
// drawrooms
//
int32_t drawrooms(int32_t daposx, int32_t daposy, int32_t daposz,
               int16_t daang, int32_t dahoriz, int16_t dacursectnum)
{
    int32_t i, j, /*cz, fz,*/ closest;
    int16_t *shortptr1, *shortptr2;

    int32_t didmirror = 0;

    beforedrawrooms = 0;

    set_globalpos(daposx, daposy, daposz);
    set_globalang(daang);

    global100horiz = dahoriz;

    // xdimenscale is scale(xdimen,yxaspect,320);
    // normalization by viewingrange so that center-of-aim doesn't depend on it
    globalhoriz = mulscale16(dahoriz-100,divscale16(xdimenscale,viewingrange))+(ydimen>>1);

    globaluclip = (0-globalhoriz)*xdimscale;
    globaldclip = (ydimen-globalhoriz)*xdimscale;

    i = mulscale16(xdimenscale,viewingrangerecip);
    globalpisibility = mulscale16(parallaxvisibility,i);
    switch (getrendermode())
    {
        // switch on renderers to make fog look almost the same everywhere

    case REND_CLASSIC:
        globalvisibility = mulscale16(g_visibility,i);
        break;
#ifdef USE_OPENGL
    case REND_POLYMOST:
        // NOTE: In Polymost, the fragment depth depends on the x screen size!
        if (r_usenewshading >= 2)
            globalvisibility = scale(g_visibility<<2, xdimen, 1680);
        else
            globalvisibility = scale(g_visibility<<2, xdimen, 1100);
        break;
# ifdef POLYMER
    case REND_POLYMER:
        globalvisibility = g_visibility<<2;
        break;
# endif
#endif
    }

    globalhisibility = mulscale16(globalvisibility,xyaspect);
    globalcisibility = mulscale8(globalhisibility,320);

    globalcursectnum = dacursectnum;
    totalclocklock = totalclock;

    if ((xyaspect != oxyaspect) || (xdimen != oxdimen) || (viewingrange != oviewingrange))
        dosetaspect();

    Bmemset(gotsector, 0, ((numsectors+7)>>3));

    if (getrendermode() != REND_CLASSIC
#ifdef YAX_ENABLE
        || yax_globallev==YAX_MAXDRAWS
#endif
        )
    {
        shortptr1 = (int16_t *)&startumost[windowx1];
        shortptr2 = (int16_t *)&startdmost[windowx1];
        i = xdimen-1;
        do
        {
            umost[i] = shortptr1[i]-windowy1;
            dmost[i] = shortptr2[i]-windowy1;
        }
        while (i--);  // xdimen == 1 is OK!
        umost[0] = shortptr1[0]-windowy1;
        dmost[0] = shortptr2[0]-windowy1;
    }

#ifdef USE_OPENGL
# ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
    {
#  ifdef YAX_ENABLE
        // BEGIN_TWEAK ceiling/floor fake 'TROR' pics, see END_TWEAK in build.c
        if (editstatus && showinvisibility)
        {
            for (i=0; i<numyaxbunches; i++)
            {
                yax_tweakpicnums(i, YAX_CEILING, 0);
                yax_tweakpicnums(i, YAX_FLOOR, 0);
            }
        }
#  endif
        polymer_glinit();
        polymer_drawrooms(daposx, daposy, daposz, daang, dahoriz, dacursectnum);
        bglDisable(GL_CULL_FACE);
        gloy1 = 0;
        return 0;
    }
# endif

    // Update starting sector number (common to classic and Polymost).
    // ADJUST_GLOBALCURSECTNUM.
    if (globalcursectnum >= MAXSECTORS)
        globalcursectnum -= MAXSECTORS;
    else
    {
        i = globalcursectnum;
        updatesectorbreadth(globalposx,globalposy,&globalcursectnum);
        if (globalcursectnum < 0) globalcursectnum = i;

        // PK 20110123: I'm not sure what the line above is supposed to do, but 'i'
        //              *can* be negative, so let's just quit here in that case...
        if (globalcursectnum<0)
            return 0;
    }

    //============================================================================= //POLYMOST BEGINS
    polymost_drawrooms();

    if (getrendermode() != REND_CLASSIC)
        return 0;
    //============================================================================= //POLYMOST ENDS
#endif

    begindrawing(); //{{{

#ifdef ENGINE_CLEAR_SCREEN
#ifdef YAX_ENABLE
    if (!g_nodraw)
#endif
    if (numyaxbunches==0)
        draw_rainbow_background();
#endif

    frameoffset = frameplace + windowy1*bytesperline + windowx1;

    //if (smostwallcnt < 0)
    //  if (getkensmessagecrc(FP_OFF(kensmessage)) != 0x56c764d4)
    //      { /* setvmode(0x3);*/ OSD_Printf("Nice try.\n"); Bexit(0); }

    numhits = xdimen; numscans = 0; numbunches = 0;
    maskwallcnt = 0; smostwallcnt = 0; smostcnt = 0; spritesortcnt = 0;

#ifdef YAX_ENABLE
    if (yax_globallev != YAX_MAXDRAWS)
    {
        j = yax_globalbunch*xdimen;

        Bmemcpy(umost, yumost+j, xdimen*sizeof(int16_t));
        Bmemcpy(dmost, ydmost+j, xdimen*sizeof(int16_t));

        for (i=0; i<xdimen; i++)
            if (umost[i] > dmost[i])
                numhits--;

//        yaxdebug("cf %d, tlev %d, bunch %d: numhits=%d", yax_globalcf, yax_globallev, yax_globalbunch, numhits);
    }
#endif

/*
    globparaceilclip = 1;
    globparaflorclip = 1;
    getzsofslope(globalcursectnum,globalposx,globalposy,&cz,&fz);
    if (globalposz < cz) globparaceilclip = 0;
    if (globalposz > fz) globparaflorclip = 0;
*/
    scansector(globalcursectnum);

    if (inpreparemirror)
    {
        // INPREPAREMIRROR_NO_BUNCHES
        // numbunches==0 can happen if the mirror is far away... the game code decides
        // to draw it, but scansector gets zero bunches.  Result: big screwup!
        // Leave inpreparemirror as is, it's restored by completemirror.
        if (numbunches==0)
        {
            enddrawing();  //!!!
            return 0;
        }

        inpreparemirror = 0;
        didmirror = 1;

        mirrorsx1 = xdimen-1; mirrorsx2 = 0;
        for (i=numscans-1; i>=0; i--)
        {
            if (wall[thewall[i]].nextsector >= 0)
            {
                if (xb1[i] < mirrorsx1) mirrorsx1 = xb1[i];
                if (xb2[i] > mirrorsx2) mirrorsx2 = xb2[i];
            }
        }

        for (i=0; i<mirrorsx1; i++)
            if (umost[i] <= dmost[i])
                { umost[i] = 1; dmost[i] = 0; numhits--; }
        for (i=mirrorsx2+1; i<xdimen; i++)
            if (umost[i] <= dmost[i])
                { umost[i] = 1; dmost[i] = 0; numhits--; }

        drawalls(0L);
        numbunches--;
        bunchfirst[0] = bunchfirst[numbunches];
        bunchlast[0] = bunchlast[numbunches];

        mirrorsy1 = min(umost[mirrorsx1],umost[mirrorsx2]);
        mirrorsy2 = max(dmost[mirrorsx1],dmost[mirrorsx2]);
    }

    while ((numbunches > 0) && (numhits > 0))
    {
        Bmemset(tempbuf, 0, numbunches);
        tempbuf[0] = 1;

        closest = 0;              //Almost works, but not quite :(
        for (i=1; i<numbunches; i++)
        {
            if ((j = bunchfront(i,closest)) < 0) continue;
            tempbuf[i] = 1;
            if (j == 0) tempbuf[closest] = 1, closest = i;
        }
        for (i=0; i<numbunches; i++) //Double-check
        {
            if (tempbuf[i]) continue;
            if ((j = bunchfront(i,closest)) < 0) continue;
            tempbuf[i] = 1;
            if (j == 0) tempbuf[closest] = 1, closest = i, i = 0;
        }

        drawalls(closest);

        numbunches--;
        bunchfirst[closest] = bunchfirst[numbunches];
        bunchlast[closest] = bunchlast[numbunches];
    }

    enddrawing();   //}}}

    return didmirror;
}

// UTILITY TYPES AND FUNCTIONS FOR DRAWMASKS OCCLUSION TREE
// typedef struct          s_maskleaf
// {
//     int32_t                index;
//     _point2d            p1, p2;
//     _equation           maskeq, p1eq, p2eq;
//     struct s_maskleaf*  branch[MAXWALLSB];
//     int32_t                 drawing;
// }                       _maskleaf;
//
// _maskleaf               maskleaves[MAXWALLSB];

// returns equation of a line given two points
static inline _equation       equation(float x1, float y1, float x2, float y2)
{
    _equation   ret;
    const float f = x2-x1;

    // vertical
    if (f == 0.f)
    {
        ret.a = 1;
        ret.b = 0;
        ret.c = -x1;

        return ret;
    }

    ret.a = (float) (y2 - y1)/f;
    ret.b = -1;
    ret.c = (y1 - (ret.a * x1));

    return ret;
}

int32_t                 wallvisible(int32_t x, int32_t y, int16_t wallnum)
{
    // 1 if wall is in front of player 0 otherwise
    int32_t            a1, a2;
    walltype        *w1, *w2;

    w1 = &wall[wallnum];
    w2 = &wall[w1->point2];

    a1 = getangle(w1->x - x, w1->y - y);
    a2 = getangle(w2->x - x, w2->y - y);

    //if ((wallnum == 23) || (wallnum == 9))
    //    OSD_Printf("Wall %d : %d - sector %d - x %d - y %d.\n", wallnum, (a2 + (2048 - a1)) & 2047, globalcursectnum, globalposx, globalposy);

    if (((a2 + (2048 - a1)) & 2047) <= 1024)
        return (1);
    return (0);
}

#if 0
// returns the intersection point between two lines
_point2d        intersection(_equation eq1, _equation eq2)
{
    _point2d    ret;
    float       det;

    det = (float)(1) / (eq1.a*eq2.b - eq2.a*eq1.b);
    ret.x = ((eq1.b*eq2.c - eq2.b*eq1.c) * det);
    ret.y = ((eq2.a*eq1.c - eq1.a*eq2.c) * det);

    return (ret);
}

// check if a point that's on the line is within the segment boundaries
int32_t             pointonmask(_point2d point, _maskleaf* wall)
{
    if ((min(wall->p1.x, wall->p2.x) <= point.x) && (point.x <= max(wall->p1.x, wall->p2.x)) && (min(wall->p1.y, wall->p2.y) <= point.y) && (point.y <= max(wall->p1.y, wall->p2.y)))
        return (1);
    return (0);
}

// returns 1 if wall2 is hidden by wall1
int32_t             wallobstructswall(_maskleaf* wall1, _maskleaf* wall2)
{
    _point2d    cross;

    cross = intersection(wall2->p1eq, wall1->maskeq);
    if (pointonmask(cross, wall1))
        return (1);

    cross = intersection(wall2->p2eq, wall1->maskeq);
    if (pointonmask(cross, wall1))
        return (1);

    cross = intersection(wall1->p1eq, wall2->maskeq);
    if (pointonmask(cross, wall2))
        return (1);

    cross = intersection(wall1->p2eq, wall2->maskeq);
    if (pointonmask(cross, wall2))
        return (1);

    return (0);
}

// recursive mask drawing function
static inline void    drawmaskleaf(_maskleaf* wall)
{
    int32_t i;

    wall->drawing = 1;
    i = 0;
    while (wall->branch[i] != NULL)
    {
        if (wall->branch[i]->drawing == 0)
        {
            //OSD_Printf("Drawing parent of %i : mask %i\n", wall->index, wall->branch[i]->index);
            drawmaskleaf(wall->branch[i]);
        }
        i++;
    }

    //OSD_Printf("Drawing mask %i\n", wall->index);
    drawmaskwall(wall->index);
}
#endif

static inline int32_t         sameside(const _equation *eq, const vec2f_t *p1, const vec2f_t *p2)
{
    const float sign1 = (eq->a * p1->x) + (eq->b * p1->y) + eq->c;
    const float sign2 = (eq->a * p2->x) + (eq->b * p2->y) + eq->c;
    return (sign1 * sign2) > 0.f;
}

// x1, y1: in/out
// rest x/y: out
static void get_wallspr_points(const spritetype *spr, int32_t *x1, int32_t *x2,
                               int32_t *y1, int32_t *y2);
static void get_floorspr_points(const tspritetype *spr, int32_t px, int32_t py,
                                int32_t *x1, int32_t *x2, int32_t *x3, int32_t *x4,
                                int32_t *y1, int32_t *y2, int32_t *y3, int32_t *y4);

#ifdef DEBUG_MASK_DRAWING
int32_t g_maskDrawMode = 0;
#endif

//
// drawmasks
//
void drawmasks(void)
{
#ifdef DEBUG_MASK_DRAWING
        static struct {
            int16_t di;  // &32768: &32767 is tspriteptr[], else thewall[] index
            int16_t i;   // sprite[] or wall[] index
        } debugmask[MAXWALLSB + MAXSPRITESONSCREEN + 1];

        int32_t dmasknum = 0;

# define debugmask_add(dispidx, idx) do { \
        if (g_maskDrawMode && getrendermode()==REND_CLASSIC) { \
            debugmask[dmasknum].di = dispidx; \
            debugmask[dmasknum++].i = idx; \
        } \
    } while (0)
#else
# define debugmask_add(dispidx, idx) do {} while (0)
#endif
    int32_t i;

    for (i=spritesortcnt-1; i>=0; i--)
        tspriteptr[i] = &tsprite[i];

    for (i=spritesortcnt-1; i>=0; i--)
    {
        const int32_t xs = tspriteptr[i]->x-globalposx, ys = tspriteptr[i]->y-globalposy;
        const int32_t yp = dmulscale6(xs,cosviewingrangeglobalang,ys,sinviewingrangeglobalang);
#ifdef USE_OPENGL
        const int32_t modelp = (usemodels && tile2model[tspriteptr[i]->picnum].modelid >= 0);
#endif

        if (yp > (4<<8))
        {
            const int32_t xp = dmulscale6(ys,cosglobalang,-xs,singlobalang);

            if (mulscale24(labs(xp+yp),xdimen) >= yp)
                goto killsprite;

            spritesxyz[i].x = scale(xp+yp,xdimen<<7,yp);
        }
        else if ((tspriteptr[i]->cstat&48) == 0)
        {
killsprite:
#ifdef USE_OPENGL
            if (!modelp)
#endif
            {
                spritesortcnt--;  //Delete face sprite if on wrong side!
                if (i != spritesortcnt)
                {
                    tspriteptr[i] = tspriteptr[spritesortcnt];
                    spritesxyz[i].x = spritesxyz[spritesortcnt].x;
                    spritesxyz[i].y = spritesxyz[spritesortcnt].y;
                }
                continue;
            }
        }
        spritesxyz[i].y = yp;
    }

    int32_t gap, ys;

    gap = 1; while (gap < spritesortcnt) gap = (gap<<1)+1;
    for (gap>>=1; gap>0; gap>>=1)   //Sort sprite list
        for (i=0; i<spritesortcnt-gap; i++)
            for (int32_t l=i; l>=0; l-=gap)
            {
                if (spritesxyz[l].y <= spritesxyz[l+gap].y) break;
                swapptr(&tspriteptr[l],&tspriteptr[l+gap]);
                swaplong(&spritesxyz[l].x,&spritesxyz[l+gap].x);
                swaplong(&spritesxyz[l].y,&spritesxyz[l+gap].y);
            }

    if (spritesortcnt > 0)
        spritesxyz[spritesortcnt].y = (spritesxyz[spritesortcnt-1].y^1);

    ys = spritesxyz[0].y; i = 0;
    for (int32_t j=1; j<=spritesortcnt; j++)
    {
        if (spritesxyz[j].y == ys)
            continue;

        ys = spritesxyz[j].y;

        if (j > i+1)
        {
            for (int32_t k=i; k<j; k++)
            {
                const tspritetype *const s = tspriteptr[k];

                spritesxyz[k].z = s->z;
                if ((s->cstat&48) != 32)
                {
                    int32_t yoff = picanm[s->picnum].yofs + s->yoffset;
                    int32_t yspan = (tilesiz[s->picnum].y*s->yrepeat<<2);

                    spritesxyz[k].z -= (yoff*s->yrepeat)<<2;

                    if (!(s->cstat&128))
                        spritesxyz[k].z -= (yspan>>1);
                    if (klabs(spritesxyz[k].z-globalposz) < (yspan>>1))
                        spritesxyz[k].z = globalposz;
                }
            }

            for (int32_t k=i+1; k<j; k++)
                for (int32_t l=i; l<k; l++)
                    if (klabs(spritesxyz[k].z-globalposz) < klabs(spritesxyz[l].z-globalposz))
                    {
                        swapptr(&tspriteptr[k],&tspriteptr[l]);
                        vec3_t tv3 = spritesxyz[k];
                        spritesxyz[k] = spritesxyz[l];
                        spritesxyz[l] = tv3;
                    }

            for (int32_t k=i+1; k<j; k++)
                for (int32_t l=i; l<k; l++)
                    if (tspriteptr[k]->x == tspriteptr[l]->x && 
                        tspriteptr[k]->y == tspriteptr[l]->y && 
                        (tspriteptr[k]->cstat & 48) == (tspriteptr[l]->cstat & 48) &&
                        tspriteptr[k]->owner < tspriteptr[l]->owner)
                    {
                        swapptr(&tspriteptr[k], &tspriteptr[l]);
                        vec3_t tv3 = spritesxyz[k];
                        spritesxyz[k] = spritesxyz[l];
                        spritesxyz[l] = tv3;
                    }
        }
        i = j;
    }

    begindrawing(); //{{{
#if 0
    for (i=spritesortcnt-1; i>=0; i--)
    {
        double xs = tspriteptr[i]->x-globalposx;
        double ys = tspriteptr[i]->y-globalposy;
        int32_t zs = tspriteptr[i]->z-globalposz;

        int32_t xp = ys*cosglobalang-xs*singlobalang;
        int32_t yp = (zs<<1);
        int32_t zp = xs*cosglobalang+ys*singlobalang;

        xs = ((double)xp*(halfxdimen<<12)/zp)+((halfxdimen+windowx1)<<12);
        ys = ((double)yp*(xdimenscale<<12)/zp)+((globalhoriz+windowy1)<<12);

        if (xs >= INT32_MIN && xs <= INT32_MAX && ys >= INT32_MIN && ys <= INT32_MAX)
        {
            drawline256(xs-65536,ys-65536,xs+65536,ys+65536,31);
            drawline256(xs+65536,ys-65536,xs-65536,ys+65536,31);
        }
    }
#endif

    vec2f_t pos;

    pos.x = fglobalposx;
    pos.y = fglobalposy;

    // CAUTION: maskwallcnt and spritesortcnt may be zero!
    // Writing e.g. "while (maskwallcnt--)" is wrong!
    while (maskwallcnt)
    {
        vec2f_t dot, dot2, middle;
        // PLAG: sorting stuff
        _equation maskeq, p1eq, p2eq;

        const int32_t w = (getrendermode()==REND_POLYMER) ?
            maskwall[maskwallcnt-1] : thewall[maskwall[maskwallcnt-1]];

        maskwallcnt--;

        dot.x = (float)wall[w].x;
        dot.y = (float)wall[w].y;
        dot2.x = (float)wall[wall[w].point2].x;
        dot2.y = (float)wall[wall[w].point2].y;

        maskeq = equation(dot.x, dot.y, dot2.x, dot2.y);

        p1eq = equation(pos.x, pos.y, dot.x, dot.y);
        p2eq = equation(pos.x, pos.y, dot2.x, dot2.y);

        middle.x = (dot.x + dot2.x) * .5f;
        middle.y = (dot.y + dot2.y) * .5f;

        i = spritesortcnt;
        while (i)
        {
            i--;
            if (tspriteptr[i] != NULL)
            {
                vec2f_t spr;
                const tspritetype *tspr = tspriteptr[i];

                spr.x = (float)tspr->x;
                spr.y = (float)tspr->y;

                if (!sameside(&maskeq, &spr, &pos))
                {
                    // Sprite and camera are on different sides of the
                    // masked wall.

                    // Check if the sprite is inside the 'cone' given by
                    // the rays from the camera to the two wall-points.
                    const int32_t inleft = sameside(&p1eq, &middle, &spr);
                    const int32_t inright = sameside(&p2eq, &middle, &spr);

                    int32_t ok = (inleft && inright);

                    if (!ok)
                    {
                        // If not, check if any of the border points are...
                        int32_t xx[4] = { tspr->x };
                        int32_t yy[4] = { tspr->y };
                        int32_t numpts, jj;

                        const _equation pineq = inleft ? p1eq : p2eq;

                        if ((tspr->cstat & 48) == 32)
                        {
                            numpts = 4;
                            get_floorspr_points(tspr, 0, 0,
                                                &xx[0], &xx[1], &xx[2], &xx[3],
                                                &yy[0], &yy[1], &yy[2], &yy[3]);
                        }
                        else
                        {
                            const int32_t oang = tspr->ang;
                            numpts = 2;

                            // Consider face sprites as wall sprites with camera ang.
                            // XXX: factor 4/5 needed?
                            if ((tspr->cstat & 48) != 16)
                                tspriteptr[i]->ang = globalang;

                            get_wallspr_points((const spritetype *)tspr, &xx[0], &xx[1], &yy[0], &yy[1]);

                            if ((tspr->cstat & 48) == 0)
                                tspriteptr[i]->ang = oang;
                        }

                        for (jj=0; jj<numpts; jj++)
                        {
                            spr.x = (float)xx[jj];
                            spr.y = (float)yy[jj];

                            if (!sameside(&maskeq, &spr, &pos))  // behind the maskwall,
                                if ((sameside(&p1eq, &middle, &spr) &&  // inside the 'cone',
                                        sameside(&p2eq, &middle, &spr))
                                        || !sameside(&pineq, &middle, &spr))  // or on the other outside.
                                {
                                    ok = 1;
                                    break;
                                }
                        }
                    }

                    if (ok)
                    {
                        debugmask_add(i | 32768, tspr->owner);
                        drawsprite(i);

                        if (tspr->cstat & 1024 && getrendermode() == REND_POLYMOST)
                            continue;

                        tspriteptr[i] = NULL;
                    }
                }
            }
        }

        debugmask_add(maskwall[maskwallcnt], thewall[maskwall[maskwallcnt]]);
        drawmaskwall(maskwallcnt);
    }

    i = spritesortcnt;

    while (i)
    {
        i--;
        if (tspriteptr[i] != NULL)
        {
            debugmask_add(i | 32768, tspriteptr[i]->owner);
            drawsprite(i);

            if ((tspriteptr[i]->cstat & 1024) != 1024 || getrendermode() != REND_POLYMOST)
                tspriteptr[i] = NULL;
        }
    }

#ifdef USE_OPENGL
    if (getrendermode() == REND_POLYMOST)
    {
        bglDepthMask(GL_FALSE);

        while (spritesortcnt)
        {
            spritesortcnt--;
            if (tspriteptr[spritesortcnt] != NULL && (tspriteptr[spritesortcnt]->cstat & 1024))
            {
                drawsprite(spritesortcnt);
                tspriteptr[spritesortcnt] = NULL;
            }
        }

        bglDepthMask(GL_TRUE);
    }
#endif

#ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
        polymer_drawmasks();
#endif
#ifdef DEBUG_MASK_DRAWING
    if (g_maskDrawMode && getrendermode() == REND_CLASSIC)
    {
        for (i=0; i<dmasknum; i++)
        {
            EDUKE32_STATIC_ASSERT(MAXWALLS <= 32768 && MAXSPRITES <= 32768);
            int32_t spritep = !!(debugmask[i].di & 32768);
            int32_t di = debugmask[i].di & 32767;
//            int32_t ii = debugmask[i].i;

            char numstr[12];
            Bsprintf(numstr, "%d", i+1);

            if (spritep)
            {
                int32_t sx = spritesxyz[di].x>>8, sy = ydim/2 + 8;
                // XXX: printext256 really ought to do bound checking on the
                // x/y coords!
                sx = clamp(sx, 0, xdim-8*Bstrlen(numstr)-1);
                printext256(sx, sy, 241, 0, numstr, 0);
            }
            else
            {
                int32_t sx = xb1[di] + (xb2[di]-xb1[di])/2, sy = ydim/2;
                sx = clamp(sx, 0, xdim-8*Bstrlen(numstr)-1);
                printext256(sx, sy, 31, 0, numstr, 0);
            }
        }
    }
#endif

    enddrawing();   //}}}
}

//
// drawmapview
//
void drawmapview(int32_t dax, int32_t day, int32_t zoome, int16_t ang)
{
    int32_t i, j, k, l;
    int32_t x, y;
    int32_t s, ox, oy;

    int32_t const oyxaspect = yxaspect, oviewingrange = viewingrange;

    setaspect(65536, divscale16((320*5)/8, 200));

    beforedrawrooms = 0;

    Bmemset(gotsector, 0, (numsectors+7)>>3);

    vec2_t const c1 ={ (windowx1<<12), (windowy1<<12) };
    vec2_t const c2 ={ ((windowx2+1)<<12)-1, ((windowy2+1)<<12)-1 };

    zoome <<= 8;

    vec2_t const bakgvect = { divscale28(sintable[(1536 - ang) & 2047], zoome),
                        divscale28(sintable[(2048 - ang) & 2047], zoome) };
    vec2_t const vect = { mulscale8(sintable[(2048 - ang) & 2047], zoome), mulscale8(sintable[(1536 - ang) & 2047], zoome) };
    vec2_t const vect2 = { mulscale16(vect.x, yxaspect), mulscale16(vect.y, yxaspect) };

    int32_t sortnum = 0;

    begindrawing(); //{{{

    tsectortype *sec;

    for (s=0,sec=(tsectortype *)&sector[s]; s<numsectors; s++,sec++)
        if (show2dsector[s>>3]&pow2char[s&7])
        {
#ifdef YAX_ENABLE
            if (yax_getbunch(s, YAX_FLOOR) >= 0 && (sector[s].floorstat&(256+128))==0)
                continue;
#endif
            int32_t npoints = 0; i = 0;
            int32_t startwall = sec->wallptr;
#if 0
            for (w=sec->wallnum,wal=&wall[startwall]; w>0; w--,wal++)
            {
                ox = wal->x - dax; oy = wal->y - day;
                x = dmulscale16(ox,xvect,-oy,yvect) + (xdim<<11);
                y = dmulscale16(oy,xvect2,ox,yvect2) + (ydim<<11);
                i |= getclipmask(x-cx1,cx2-x,y-cy1,cy2-y);
                rx1[npoints] = x;
                ry1[npoints] = y;
                xb1[npoints] = wal->point2 - startwall;
                npoints++;
            }
#else
            j = startwall; l = 0;
            twalltype *wal;
            int32_t w;
            for (w=sec->wallnum,wal=(twalltype *)&wall[startwall]; w>0; w--,wal++,j++)
            {
                k = lastwall(j);
                if ((k > j) && (npoints > 0)) { xb1[npoints-1] = l; l = npoints; } //overwrite point2
                //wall[k].x wal->x wall[wal->point2].x
                //wall[k].y wal->y wall[wal->point2].y
                if (!dmulscale1(wal->x-wall[k].x,wall[wal->point2].y-wal->y,-(wal->y-wall[k].y),wall[wal->point2].x-wal->x)) continue;
                ox = wal->x - dax; oy = wal->y - day;
                x = dmulscale16(ox,vect.x,-oy,vect.y) + (xdim<<11);
                y = dmulscale16(oy,vect2.x,ox,vect2.y) + (ydim<<11);
                i |= getclipmask(x-c1.x,c2.x-x,y-c1.y,c2.y-y);
                rx1[npoints] = x;
                ry1[npoints] = y;
                xb1[npoints] = npoints+1;
                npoints++;
            }
            if (npoints > 0) xb1[npoints-1] = l; //overwrite point2
#endif
            if ((i&0xf0) != 0xf0) continue;

            vec2_t bak ={ rx1[0], mulscale16(ry1[0]-(ydim<<11),xyaspect)+(ydim<<11) };

            if (i&0x0f)
            {
                npoints = clippoly(npoints,i);
                if (npoints < 3) continue;
            }

            //Collect floor sprites to draw
            for (i=headspritesect[s]; i>=0; i=nextspritesect[i])
                if ((sprite[i].cstat&48) == 32)
                {
                    if ((sprite[i].cstat&(64+8)) == (64+8)) continue;
                    tsprite[sortnum++].owner = i;
                }

            gotsector[s>>3] |= pow2char[s&7];

            globalorientation = (int32_t)sec->floorstat;
            if ((globalorientation&1) != 0) continue;

            globalpal = sec->floorpal;

            if (palookup[sec->floorpal] != globalpalwritten)
            {
                globalpalwritten = palookup[sec->floorpal];
                if (!globalpalwritten) globalpalwritten = palookup[0];	// JBF: fixes null-pointer crash
                setpalookupaddress(globalpalwritten);
            }
            globalpicnum = sec->floorpicnum;
            if ((unsigned)globalpicnum >= (unsigned)MAXTILES) globalpicnum = 0;
            setgotpic(globalpicnum);
            if ((tilesiz[globalpicnum].x <= 0) || (tilesiz[globalpicnum].y <= 0)) continue;
            DO_TILE_ANIM(globalpicnum, s);
            if (waloff[globalpicnum] == 0) loadtile(globalpicnum);
            globalbufplc = waloff[globalpicnum];
            globalshade = max(min(sec->floorshade,numshades-1),0);
            globvis = globalhisibility;
            if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));
            globalpolytype = 0;
            if ((globalorientation&64) == 0)
            {
                set_globalpos(dax, day, globalposz);
                globalx1 = bakgvect.x; globaly1 = bakgvect.y;
                globalx2 = bakgvect.x; globaly2 = bakgvect.y;
            }
            else
            {
                ox = wall[wall[startwall].point2].x - wall[startwall].x;
                oy = wall[wall[startwall].point2].y - wall[startwall].y;
                i = nsqrtasm(uhypsq(ox,oy)); if (i == 0) continue;
                i = 1048576/i;
                globalx1 = mulscale10(dmulscale10(ox,bakgvect.x,oy,bakgvect.y),i);
                globaly1 = mulscale10(dmulscale10(ox,bakgvect.y,-oy,bakgvect.x),i);
                ox = (bak.x>>4)-(xdim<<7); oy = (bak.y>>4)-(ydim<<7);
                globalposx = dmulscale28(-oy, globalx1, -ox, globaly1);
                globalposy = dmulscale28(-ox, globalx1, oy, globaly1);
                globalx2 = -globalx1;
                globaly2 = -globaly1;

                int32_t const daslope = sector[s].floorheinum;
                i = nsqrtasm(daslope*daslope+16777216);
                set_globalpos(globalposx, mulscale12(globalposy,i), globalposz);
                globalx2 = mulscale12(globalx2,i);
                globaly2 = mulscale12(globaly2,i);
            }

            calc_globalshifts();

            sethlinesizes(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4,globalbufplc);

            if ((globalorientation&0x4) > 0)
            {
                i = globalposx; globalposx = -globalposy; globalposy = -i;
                i = globalx2; globalx2 = globaly1; globaly1 = i;
                i = globalx1; globalx1 = -globaly2; globaly2 = -i;
            }
            if ((globalorientation&0x10) > 0) globalx1 = -globalx1, globaly1 = -globaly1, globalposx = -globalposx;
            if ((globalorientation&0x20) > 0) globalx2 = -globalx2, globaly2 = -globaly2, globalposy = -globalposy;
            asm1 = (globaly1<<globalxshift);
            asm2 = (globalx2<<globalyshift);
            globalx1 <<= globalxshift;
            globaly2 <<= globalyshift;
            set_globalpos(((int64_t) globalposx<<(20+globalxshift))+(((uint32_t) sec->floorxpanning)<<24),
                ((int64_t) globalposy<<(20+globalyshift))-(((uint32_t) sec->floorypanning)<<24),
                globalposz);
            fillpolygon(npoints);
        }

    //Sort sprite list
    int32_t gap = 1;

    while (gap < sortnum) gap = (gap << 1) + 1;

    for (gap>>=1; gap>0; gap>>=1)
        for (i=0; i<sortnum-gap; i++)
            for (j=i; j>=0; j-=gap)
            {
                if (sprite[tsprite[j].owner].z <= sprite[tsprite[j+gap].owner].z) break;
                swapshort(&tsprite[j].owner,&tsprite[j+gap].owner);
            }

    for (s=sortnum-1; s>=0; s--)
    {
        tspritetype * const spr = (tspritetype * )&sprite[tsprite[s].owner];
        if ((spr->cstat&48) == 32)
        {
            const int32_t xspan = tilesiz[spr->picnum].x;

            int32_t npoints = 0;
            vec2_t v1 ={ spr->x, spr->y }, v2, v3, v4;

            get_floorspr_points(spr, 0, 0, &v1.x, &v2.x, &v3.x, &v4.x,
                                &v1.y, &v2.y, &v3.y, &v4.y);

            xb1[0] = 1; xb1[1] = 2; xb1[2] = 3; xb1[3] = 0;
            npoints = 4;

            i = 0;

            ox = v1.x - dax; oy = v1.y - day;
            x = dmulscale16(ox,vect.x,-oy,vect.y) + (xdim<<11);
            y = dmulscale16(oy,vect2.x,ox,vect2.y) + (ydim<<11);
            i |= getclipmask(x-c1.x,c2.x-x,y-c1.y,c2.y-y);
            rx1[0] = x; ry1[0] = y;

            ox = v2.x - dax; oy = v2.y - day;
            x = dmulscale16(ox,vect.x,-oy,vect.y) + (xdim<<11);
            y = dmulscale16(oy,vect2.x,ox,vect2.y) + (ydim<<11);
            i |= getclipmask(x-c1.x,c2.x-x,y-c1.y,c2.y-y);
            rx1[1] = x; ry1[1] = y;

            ox = v3.x - dax; oy = v3.y - day;
            x = dmulscale16(ox,vect.x,-oy,vect.y) + (xdim<<11);
            y = dmulscale16(oy,vect2.x,ox,vect2.y) + (ydim<<11);
            i |= getclipmask(x-c1.x,c2.x-x,y-c1.y,c2.y-y);
            rx1[2] = x; ry1[2] = y;

            x = rx1[0]+rx1[2]-rx1[1];
            y = ry1[0]+ry1[2]-ry1[1];
            i |= getclipmask(x-c1.x,c2.x-x,y-c1.y,c2.y-y);
            rx1[3] = x; ry1[3] = y;

            if ((i&0xf0) != 0xf0) continue;

            vec2_t bak = { rx1[0], mulscale16(ry1[0] - (ydim << 11), xyaspect) + (ydim << 11) };

            if (i&0x0f)
            {
                npoints = clippoly(npoints,i);
                if (npoints < 3) continue;
            }

            globalpicnum = spr->picnum;
            globalpal = spr->pal; // GL needs this, software doesn't
            if ((unsigned)globalpicnum >= (unsigned)MAXTILES) globalpicnum = 0;
            setgotpic(globalpicnum);
            if ((tilesiz[globalpicnum].x <= 0) || (tilesiz[globalpicnum].y <= 0)) continue;
            DO_TILE_ANIM(globalpicnum, s);
            if (waloff[globalpicnum] == 0) loadtile(globalpicnum);
            globalbufplc = waloff[globalpicnum];

            // 'loading' the tile doesn't actually guarantee that it's there afterwards.
            // This can really happen when drawing the second frame of a floor-aligned
            // 'storm icon' sprite (4894+1)
            if (!globalbufplc)
                continue;

            if ((sector[spr->sectnum].ceilingstat&1) > 0)
                globalshade = ((int32_t)sector[spr->sectnum].ceilingshade);
            else
                globalshade = ((int32_t)sector[spr->sectnum].floorshade);
            globalshade = max(min(globalshade+spr->shade+6,numshades-1),0);
            asm3 = FP_OFF(palookup[spr->pal]+(globalshade<<8));
            globvis = globalhisibility;
            if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));
            globalpolytype = ((spr->cstat&2)>>1)+1;

            //relative alignment stuff
            ox = v2.x-v1.x; oy = v2.y-v1.y;
            i = ox*ox+oy*oy; if (i == 0) continue; i = tabledivide32_noinline(65536*16384, i);
            globalx1 = mulscale10(dmulscale10(ox,bakgvect.x,oy,bakgvect.y),i);
            globaly1 = mulscale10(dmulscale10(ox,bakgvect.y,-oy,bakgvect.x),i);
            ox = v1.y-v4.y; oy = v4.x-v1.x;
            i = ox*ox+oy*oy; if (i == 0) continue; i = tabledivide32_noinline(65536*16384, i);
            globalx2 = mulscale10(dmulscale10(ox,bakgvect.x,oy,bakgvect.y),i);
            globaly2 = mulscale10(dmulscale10(ox,bakgvect.y,-oy,bakgvect.x),i);

            ox = picsiz[globalpicnum]; oy = ((ox>>4)&15); ox &= 15;
            if (pow2long[ox] != xspan)
            {
                ox++;
                globalx1 = mulscale(globalx1,xspan,ox);
                globaly1 = mulscale(globaly1,xspan,ox);
            }

            bak.x = (bak.x>>4)-(xdim<<7); bak.y = (bak.y>>4)-(ydim<<7);
            globalposx = dmulscale28(-bak.y,globalx1,-bak.x,globaly1);
            globalposy = dmulscale28(bak.x,globalx2,-bak.y,globaly2);

            if ((spr->cstat&2) == 0)
                msethlineshift(ox,oy);
            else
            {
                setup_blend(spr->blend, spr->cstat&512);
                tsethlineshift(ox,oy);
            }

            if ((spr->cstat&0x4) > 0) globalx1 = -globalx1, globaly1 = -globaly1, globalposx = -globalposx;
            asm1 = (globaly1<<2); globalx1 <<= 2; globalposx <<= (20+2);
            asm2 = (globalx2<<2); globaly2 <<= 2; globalposy <<= (20+2);

            set_globalpos(globalposx, globalposy, globalposz);

            // so polymost can get the translucency. ignored in software mode:
            globalorientation = ((spr->cstat&2)<<7) | ((spr->cstat&512)>>2);
            fillpolygon(npoints);
        }
    }

    enddrawing();   //}}}

    if (r_usenewaspect)
        setaspect(oviewingrange, oyxaspect);
    else
        setaspect(65536, divscale16(ydim*320, xdim*200));
}

////////// Per-map ART file loading //////////

// Some forward declarations.
static void set_picsiz(int32_t picnum);
static const char *E_GetArtFileName(int32_t tilefilei);
static int32_t E_ReadArtFileOfID(int32_t tilefilei);

static inline void clearmapartfilename(void)
{
    Bmemset(mapartfilename, 0, sizeof(mapartfilename));
    mapartfnXXofs = 0;
}

static inline void E_RecalcPicSiz(void)
{
    for (int i=0; i<MAXTILES; i++)
        set_picsiz(i);
}

#define RESTORE_MAPART_ARRAY(origar, bakar) do { \
    EDUKE32_STATIC_ASSERT(sizeof(origar[0]) == sizeof(bakar[0])); \
    Bmemcpy(origar, bakar, MAXUSERTILES*sizeof(origar[0])); \
    DO_FREE_AND_NULL(bakar); \
} while (0)

// Allocate per-map ART backup array and back up the original!
#ifdef __cplusplus
template <typename origar_t, typename bakar_t>
static inline void ALLOC_MAPART_ARRAY(origar_t &origar, bakar_t &bakar)
{
    bakar = (bakar_t)Xmalloc(MAXUSERTILES*sizeof(origar[0]));
    Bmemcpy(bakar, origar, MAXUSERTILES*sizeof(origar[0]));
}
#else
#define ALLOC_MAPART_ARRAY(origar, bakar) do { \
    bakar = Xmalloc(MAXUSERTILES*sizeof(origar[0])); \
    Bmemcpy(bakar, origar, MAXUSERTILES*sizeof(origar[0])); \
} while (0)
#endif

void E_MapArt_Clear(void)
{
    int32_t i;

    if (g_bakTileFileNum == NULL)
        return;  // per-map ART N/A

    clearmapartfilename();

    if (artfilnum >= MAXARTFILES_BASE)
    {
        kclose(artfil);

        artfil = -1;
        artfilnum = -1;
        artfilplc = 0L;
    }

    for (i=0; i<MAXTILES; i++)
        if (tilefilenum[i] >= MAXARTFILES_BASE)
        {
            // XXX: OK way to free it? Better: cache1d API. CACHE1D_FREE
            walock[i] = 1;
            waloff[i] = 0;
        }

    // Restore original per-tile arrays
    RESTORE_MAPART_ARRAY(tilefilenum, g_bakTileFileNum);
    RESTORE_MAPART_ARRAY(tilefileoffs, g_bakTileFileOffs);
    RESTORE_MAPART_ARRAY(tilesiz, g_bakTileSiz);
    RESTORE_MAPART_ARRAY(picanm, g_bakPicAnm);

    E_RecalcPicSiz();
#ifdef USE_OPENGL
    gltexinvalidatetype(INVALIDATE_ART);
# ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
        polymer_texinvalidate();
# endif
#endif
}

void E_MapArt_Setup(const char *filename)
{
    int32_t i;

    E_MapArt_Clear();

    if (Bstrlen(filename) + 7 >= sizeof(mapartfilename))
        return;

    Bstrcpy(mapartfilename, filename);
    append_ext_UNSAFE(mapartfilename, "_XX.art");
    mapartfnXXofs = Bstrlen(mapartfilename) - 6;

    // Check for first per-map ART file: if that one doesn't exist, don't load any.
    {
        int32_t fil = kopen4load(E_GetArtFileName(MAXARTFILES_BASE), 0);

        if (fil == -1)
        {
            clearmapartfilename();
            return;
        }

        kclose(fil);
    }

    // Allocate backup arrays.
    ALLOC_MAPART_ARRAY(tilefilenum, g_bakTileFileNum);
    ALLOC_MAPART_ARRAY(tilefileoffs, g_bakTileFileOffs);
    ALLOC_MAPART_ARRAY(tilesiz, g_bakTileSiz);
    ALLOC_MAPART_ARRAY(picanm, g_bakPicAnm);

    for (i=MAXARTFILES_BASE; i<MAXARTFILES_TOTAL; i++)
    {
        int32_t ret = E_ReadArtFileOfID(i);

        if (ret != 0)
        {
            // NOTE: i == MAXARTFILES_BASE && ret == -1 can only have happened
            // if the file was deleted between the above file existence check
            // and now.  Very cornerly... but I like my code to be prepared to
            // any eventuality.
            if (i == MAXARTFILES_BASE || ret != -1)
                E_MapArt_Clear();
            break;
        }
    }

    E_RecalcPicSiz();
#ifdef USE_OPENGL
    gltexinvalidatetype(INVALIDATE_ART);
# ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
        polymer_texinvalidate();
# endif
#endif
}

//////////////////// LOADING AND SAVING ROUTINES ////////////////////

FORCE_INLINE int32_t have_maptext(void)
{
    return (mapversion >= 10);
}

static void prepare_loadboard(int32_t fil, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
{
    initspritelists();

    Bmemset(show2dsector, 0, sizeof(show2dsector));
    Bmemset(show2dsprite, 0, sizeof(show2dsprite));
    Bmemset(show2dwall, 0, sizeof(show2dwall));
    Bmemset(sectorchanged, 0, sizeof(sectorchanged));
    Bmemset(spritechanged, 0, sizeof(spritechanged));
    Bmemset(wallchanged, 0, sizeof(wallchanged));

    if (!have_maptext())
    {
        kread(fil,&dapos->x,4); dapos->x = B_LITTLE32(dapos->x);
        kread(fil,&dapos->y,4); dapos->y = B_LITTLE32(dapos->y);
        kread(fil,&dapos->z,4); dapos->z = B_LITTLE32(dapos->z);
        kread(fil,daang,2);  *daang  = B_LITTLE16(*daang) & 2047;
        kread(fil,dacursectnum,2); *dacursectnum = B_LITTLE16(*dacursectnum);
    }
}

static int32_t finish_loadboard(const vec3_t *dapos, int16_t *dacursectnum, int16_t numsprites, char myflags)
{
    int32_t i, realnumsprites=numsprites, numremoved;

#if !defined USE_OPENGL || !defined POLYMER
    UNREFERENCED_PARAMETER(myflags);
#endif

    for (i=0; i<numsprites; i++)
    {
        int32_t removeit = 0;

        if ((sprite[i].cstat & 48) == 48)
            sprite[i].cstat &= ~48;

        if (sprite[i].statnum == MAXSTATUS)
        {
            // Sprite was removed in loadboard() -> check_sprite(). Insert it
            // for now, because we must maintain the sprite numbering.
            sprite[i].statnum = sprite[i].sectnum = 0;
            removeit = 1;
        }

        insertsprite(sprite[i].sectnum, sprite[i].statnum);

        if (removeit)
        {
            // Flag .statnum==MAXSTATUS, temporarily creating an inconsistency
            // with sprite list.
            sprite[i].statnum = MAXSTATUS;
            realnumsprites--;
        }
    }

    if (numsprites != realnumsprites)
    {
        for (i=0; i<numsprites; i++)
            if (sprite[i].statnum == MAXSTATUS)
            {
                // Now remove it for real!
                sprite[i].statnum = 0;
                deletesprite(i);
            }
    }

    numremoved = (numsprites-realnumsprites);
    numsprites = realnumsprites;
    Bassert(numsprites == Numsprites);

    //Must be after loading sectors, etc!
    updatesector(dapos->x, dapos->y, dacursectnum);

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (!quickloadboard)
#endif
    {
        Bmemset(spriteext, 0, sizeof(spriteext_t)*MAXSPRITES);

#ifdef USE_OPENGL
        Bmemset(spritesmooth, 0, sizeof(spritesmooth_t)*(MAXSPRITES+MAXUNIQHUDID));

# ifdef POLYMER
        if (getrendermode() == REND_POLYMER)
        {
            if ((myflags&4)==0)
                polymer_loadboard();
        }
# endif
#endif
    }

    guniqhudid = 0;

    Bmemset(tilecols, 0, sizeof(tilecols));
    return numremoved;
}


#define MYMAXSECTORS() (MAXSECTORS==MAXSECTORSV7 || mapversion <= 7 ? MAXSECTORSV7 : MAXSECTORSV8)
#define MYMAXWALLS()   (MAXSECTORS==MAXSECTORSV7 || mapversion <= 7 ? MAXWALLSV7 : MAXWALLSV8)
#define MYMAXSPRITES() (MAXSECTORS==MAXSECTORSV7 || mapversion <= 7 ? MAXSPRITESV7 : MAXSPRITESV8)

// Sprite checking

static void remove_sprite(int32_t i)
{
    Bmemset(&sprite[i], 0, sizeof(spritetype));
    sprite[i].statnum = MAXSTATUS;
    sprite[i].sectnum = MAXSECTORS;
}

// This is only to be run after reading the sprite array!
static void check_sprite(int32_t i)
{
    if ((unsigned)sprite[i].statnum >= MAXSTATUS)
    {
        initprintf(OSD_ERROR "Map error: sprite #%d (%d,%d) with illegal statnum (%d) REMOVED.\n",
                   i, TrackerCast(sprite[i].x), TrackerCast(sprite[i].y), TrackerCast(sprite[i].statnum));
        remove_sprite(i);
    }
    else if ((unsigned)sprite[i].picnum >= MAXTILES)
    {
        initprintf(OSD_ERROR "Map error: sprite #%d (%d,%d) with illegal picnum (%d) REMOVED.\n",
                   i, TrackerCast(sprite[i].x), TrackerCast(sprite[i].y), TrackerCast(sprite[i].sectnum));
        remove_sprite(i);
    }
    else if ((unsigned)sprite[i].sectnum >= (unsigned)numsectors)
    {
        const int32_t osectnum = sprite[i].sectnum;

        sprite[i].sectnum = -1;
        updatesector(sprite[i].x, sprite[i].y, &sprite[i].sectnum);

        if (sprite[i].sectnum < 0)
            remove_sprite(i);

        initprintf(OSD_ERROR "Map error: sprite #%d (%d,%d) with illegal sector (%d) ",
                   i, TrackerCast(sprite[i].x), TrackerCast(sprite[i].y), osectnum);

        if (sprite[i].statnum != MAXSTATUS)
            initprintf("changed to sector %d.\n", TrackerCast(sprite[i].sectnum));
        else
            initprintf("REMOVED.\n");
    }
}

#ifdef NEW_MAP_FORMAT
// Returns the number of sprites, or <0 on error.
LUNATIC_CB int32_t (*loadboard_maptext)(int32_t fil, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum);
#endif

#include "md4.h"

// flags: 1, 2: former parameter "fromwhere"
//           4: don't call polymer_loadboard
//           8: don't autoexec <mapname>.cfg
// returns: on success, number of removed sprites
//          -1: file not found
//          -2: invalid version
//          -3: invalid number of sectors, walls or sprites
//       <= -4: map-text error
int32_t loadboard(const char *filename, char flags, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
{
    int32_t fil, i;
    int16_t numsprites;
    const char myflags = flags&(~3);

    flags &= 3;

    if ((fil = kopen4load(filename,flags)) == -1)
        { mapversion = 7; return -1; }

    if (kread(fil, &mapversion, 4) != 4)
        return -2;

    {
        int32_t ok = 0;

#ifdef NEW_MAP_FORMAT
        // Check for map-text first.
        if (!Bmemcmp(&mapversion, "--ED", 4))
        {
            mapversion = 10;
            ok = 1;
        }
        else
#endif
        {
            // Not map-text. We expect a little-endian version int now.
            mapversion = B_LITTLE32(mapversion);
#ifdef YAX_ENABLE
            ok |= (mapversion==9);
#endif
#if MAXSECTORS==MAXSECTORSV8
            // v8 engine
            ok |= (mapversion==8);
#endif
            ok |= (mapversion==7);
        }

        if (!ok)
        {
            kclose(fil);
            return -2;
        }
    }

    prepare_loadboard(fil, dapos, daang, dacursectnum);

#ifdef NEW_MAP_FORMAT
    if (have_maptext())
    {
        int32_t ret = klseek(fil, 0, SEEK_SET);

        if (ret == 0)
            ret = loadboard_maptext(fil, dapos, daang, dacursectnum);

        if (ret < 0)
        {
            kclose(fil);
            return ret;
        }

        numsprites = ret;
        goto skip_reading_mapbin;
    }
#endif

    ////////// Read sectors //////////

    kread(fil,&numsectors,2); numsectors = B_LITTLE16(numsectors);
    if ((unsigned)numsectors >= MYMAXSECTORS()+1) { kclose(fil); return -3; }

    kread(fil, sector, sizeof(sectortypev7)*numsectors);

    for (i=numsectors-1; i>=0; i--)
    {
#ifdef NEW_MAP_FORMAT
        Bmemmove(&sector[i], &(((sectortypev7 *)sector)[i]), sizeof(sectortypevx));
        inplace_vx_from_v7_sector(&sector[i]);
#endif
        sector[i].wallptr       = B_LITTLE16(sector[i].wallptr);
        sector[i].wallnum       = B_LITTLE16(sector[i].wallnum);
        sector[i].ceilingz      = B_LITTLE32(sector[i].ceilingz);
        sector[i].floorz        = B_LITTLE32(sector[i].floorz);
        sector[i].ceilingstat   = B_LITTLE16(sector[i].ceilingstat);
        sector[i].floorstat     = B_LITTLE16(sector[i].floorstat);
        sector[i].ceilingpicnum = B_LITTLE16(sector[i].ceilingpicnum);
        sector[i].ceilingheinum = B_LITTLE16(sector[i].ceilingheinum);
        sector[i].floorpicnum   = B_LITTLE16(sector[i].floorpicnum);
        sector[i].floorheinum   = B_LITTLE16(sector[i].floorheinum);
        sector[i].lotag         = B_LITTLE16(sector[i].lotag);
        sector[i].hitag         = B_LITTLE16(sector[i].hitag);
        sector[i].extra         = B_LITTLE16(sector[i].extra);
#ifdef NEW_MAP_FORMAT
        inplace_vx_tweak_sector(&sector[i], mapversion==9);
#endif
    }


    ////////// Read walls //////////

    kread(fil,&numwalls,2); numwalls = B_LITTLE16(numwalls);
    if ((unsigned)numwalls >= MYMAXWALLS()+1) { kclose(fil); return -3; }

    kread(fil, wall, sizeof(walltypev7)*numwalls);

    for (i=numwalls-1; i>=0; i--)
    {
#ifdef NEW_MAP_FORMAT
        Bmemmove(&wall[i], &(((walltypev7 *)wall)[i]), sizeof(walltypevx));
        inplace_vx_from_v7_wall(&wall[i]);
#endif
        wall[i].x          = B_LITTLE32(wall[i].x);
        wall[i].y          = B_LITTLE32(wall[i].y);
        wall[i].point2     = B_LITTLE16(wall[i].point2);
        wall[i].nextwall   = B_LITTLE16(wall[i].nextwall);
        wall[i].nextsector = B_LITTLE16(wall[i].nextsector);
        wall[i].cstat      = B_LITTLE16(wall[i].cstat);
        wall[i].picnum     = B_LITTLE16(wall[i].picnum);
        wall[i].overpicnum = B_LITTLE16(wall[i].overpicnum);
        wall[i].lotag      = B_LITTLE16(wall[i].lotag);
        wall[i].hitag      = B_LITTLE16(wall[i].hitag);
        wall[i].extra      = B_LITTLE16(wall[i].extra);
#ifdef NEW_MAP_FORMAT
        inplace_vx_tweak_wall(&wall[i], mapversion==9);
#endif
    }


    ////////// Read sprites //////////

    kread(fil,&numsprites,2); numsprites = B_LITTLE16(numsprites);
    if ((unsigned)numsprites >= MYMAXSPRITES()+1) { kclose(fil); return -3; }

    kread(fil, sprite, sizeof(spritetype)*numsprites);

#ifdef NEW_MAP_FORMAT
skip_reading_mapbin:
#endif

    klseek(fil, 0, SEEK_SET);
    int32_t boardsize = kfilelength(fil);
    uint8_t *fullboard = (uint8_t*)Xmalloc(boardsize);
    kread(fil, fullboard, boardsize);
    md4once(fullboard, boardsize, g_loadedMapHack.md4);
    Bfree(fullboard);

    kclose(fil);
    // Done reading file.

    for (i=numsprites-1; i>=0; i--)
    {
        if (!have_maptext())
        {
            sprite[i].x       = B_LITTLE32(sprite[i].x);
            sprite[i].y       = B_LITTLE32(sprite[i].y);
            sprite[i].z       = B_LITTLE32(sprite[i].z);
            sprite[i].cstat   = B_LITTLE16(sprite[i].cstat);
            sprite[i].picnum  = B_LITTLE16(sprite[i].picnum);
            sprite[i].sectnum = B_LITTLE16(sprite[i].sectnum);
            sprite[i].statnum = B_LITTLE16(sprite[i].statnum);
            sprite[i].ang     = B_LITTLE16(sprite[i].ang);
            sprite[i].owner   = B_LITTLE16(sprite[i].owner);
            sprite[i].xvel    = B_LITTLE16(sprite[i].xvel);
            sprite[i].yvel    = B_LITTLE16(sprite[i].yvel);
            sprite[i].zvel    = B_LITTLE16(sprite[i].zvel);
            sprite[i].lotag   = B_LITTLE16(sprite[i].lotag);
            sprite[i].hitag   = B_LITTLE16(sprite[i].hitag);
            sprite[i].extra   = B_LITTLE16(sprite[i].extra);
        }

        check_sprite(i);
    }

    // Back up the map version of the *loaded* map. Must be before yax_update().
    g_loadedMapVersion = mapversion;
#ifdef YAX_ENABLE
    yax_update(mapversion<9);
    if (editstatus)
        yax_updategrays(dapos->z);
#endif

    if ((myflags&8)==0)
    {
        char fn[BMAX_PATH];

        Bstrcpy(fn, filename);
        append_ext_UNSAFE(fn, ".cfg");

        OSD_Exec(fn);

        system_getcvars();

        // Per-map ART
        E_MapArt_Setup(filename);
    }

    // initprintf("Loaded map \"%s\" (md4sum: %08x%08x%08x%08x)\n", filename, B_BIG32(*((int32_t*)&md4out[0])), B_BIG32(*((int32_t*)&md4out[4])), B_BIG32(*((int32_t*)&md4out[8])), B_BIG32(*((int32_t*)&md4out[12])));

    return finish_loadboard(dapos, dacursectnum, numsprites, myflags);
}


//
// loadboardv5/6
//
#include "engine_oldmap.h"

// Powerslave uses v6
// Witchaven 1 and TekWar and LameDuke use v5
int32_t loadoldboard(const char *filename, char fromwhere, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
{
    int32_t fil, i;
    int16_t numsprites;

    struct sectortypev5 v5sect;
    struct walltypev5   v5wall;
    struct spritetypev5 v5spr;
    struct sectortypev6 v6sect;
    struct walltypev6   v6wall;
    struct spritetypev6 v6spr;

    if ((fil = kopen4load(filename,fromwhere)) == -1)
        { mapversion = 5L; return(-1); }

    kread(fil,&mapversion,4); mapversion = B_LITTLE32(mapversion);
    if (mapversion != 5L && mapversion != 6L) { kclose(fil); return(-2); }

    prepare_loadboard(fil, dapos, daang, dacursectnum);

    kread(fil,&numsectors,2); numsectors = B_LITTLE16(numsectors);
    if (numsectors > MAXSECTORS) { kclose(fil); return(-1); }
    for (i=0; i<numsectors; i++)
    {
        switch (mapversion)
        {
        case 5:
            kread(fil,&v5sect,sizeof(struct sectortypev5));
            v5sect.wallptr = B_LITTLE16(v5sect.wallptr);
            v5sect.wallnum = B_LITTLE16(v5sect.wallnum);
            v5sect.ceilingpicnum = B_LITTLE16(v5sect.ceilingpicnum);
            v5sect.floorpicnum = B_LITTLE16(v5sect.floorpicnum);
            v5sect.ceilingheinum = B_LITTLE16(v5sect.ceilingheinum);
            v5sect.floorheinum = B_LITTLE16(v5sect.floorheinum);
            v5sect.ceilingz = B_LITTLE32(v5sect.ceilingz);
            v5sect.floorz = B_LITTLE32(v5sect.floorz);
            v5sect.lotag = B_LITTLE16(v5sect.lotag);
            v5sect.hitag = B_LITTLE16(v5sect.hitag);
            v5sect.extra = B_LITTLE16(v5sect.extra);
            break;
        case 6:
            kread(fil,&v6sect,sizeof(struct sectortypev6));
            v6sect.wallptr = B_LITTLE16(v6sect.wallptr);
            v6sect.wallnum = B_LITTLE16(v6sect.wallnum);
            v6sect.ceilingpicnum = B_LITTLE16(v6sect.ceilingpicnum);
            v6sect.floorpicnum = B_LITTLE16(v6sect.floorpicnum);
            v6sect.ceilingheinum = B_LITTLE16(v6sect.ceilingheinum);
            v6sect.floorheinum = B_LITTLE16(v6sect.floorheinum);
            v6sect.ceilingz = B_LITTLE32(v6sect.ceilingz);
            v6sect.floorz = B_LITTLE32(v6sect.floorz);
            v6sect.lotag = B_LITTLE16(v6sect.lotag);
            v6sect.hitag = B_LITTLE16(v6sect.hitag);
            v6sect.extra = B_LITTLE16(v6sect.extra);
            break;
        }

        switch (mapversion)
        {
        case 5:
            convertv5sectv6(&v5sect,&v6sect);
        case 6:
            convertv6sectv7(&v6sect,&sector[i]);
        }
    }

    kread(fil,&numwalls,2); numwalls = B_LITTLE16(numwalls);
    if (numwalls > MAXWALLS) { kclose(fil); return(-1); }
    for (i=0; i<numwalls; i++)
    {
        switch (mapversion)
        {
        case 5:
            kread(fil,&v5wall,sizeof(struct walltypev5));
            v5wall.x = B_LITTLE32(v5wall.x);
            v5wall.y = B_LITTLE32(v5wall.y);
            v5wall.point2 = B_LITTLE16(v5wall.point2);
            v5wall.picnum = B_LITTLE16(v5wall.picnum);
            v5wall.overpicnum = B_LITTLE16(v5wall.overpicnum);
            v5wall.cstat = B_LITTLE16(v5wall.cstat);
            v5wall.nextsector1 = B_LITTLE16(v5wall.nextsector1);
            v5wall.nextwall1 = B_LITTLE16(v5wall.nextwall1);
            v5wall.nextsector2 = B_LITTLE16(v5wall.nextsector2);
            v5wall.nextwall2 = B_LITTLE16(v5wall.nextwall2);
            v5wall.lotag = B_LITTLE16(v5wall.lotag);
            v5wall.hitag = B_LITTLE16(v5wall.hitag);
            v5wall.extra = B_LITTLE16(v5wall.extra);
            break;
        case 6:
            kread(fil,&v6wall,sizeof(struct walltypev6));
            v6wall.x = B_LITTLE32(v6wall.x);
            v6wall.y = B_LITTLE32(v6wall.y);
            v6wall.point2 = B_LITTLE16(v6wall.point2);
            v6wall.nextsector = B_LITTLE16(v6wall.nextsector);
            v6wall.nextwall = B_LITTLE16(v6wall.nextwall);
            v6wall.picnum = B_LITTLE16(v6wall.picnum);
            v6wall.overpicnum = B_LITTLE16(v6wall.overpicnum);
            v6wall.cstat = B_LITTLE16(v6wall.cstat);
            v6wall.lotag = B_LITTLE16(v6wall.lotag);
            v6wall.hitag = B_LITTLE16(v6wall.hitag);
            v6wall.extra = B_LITTLE16(v6wall.extra);
            break;
        }

        switch (mapversion)
        {
        case 5:
            convertv5wallv6(&v5wall,&v6wall,i);
        case 6:
            convertv6wallv7(&v6wall,&wall[i]);
        }
    }

    kread(fil,&numsprites,2); numsprites = B_LITTLE16(numsprites);
    if (numsprites > MAXSPRITES) { kclose(fil); return(-1); }
    for (i=0; i<numsprites; i++)
    {
        switch (mapversion)
        {
        case 5:
            kread(fil,&v5spr,sizeof(struct spritetypev5));
            v5spr.x = B_LITTLE32(v5spr.x);
            v5spr.y = B_LITTLE32(v5spr.y);
            v5spr.z = B_LITTLE32(v5spr.z);
            v5spr.picnum = B_LITTLE16(v5spr.picnum);
            v5spr.ang = B_LITTLE16(v5spr.ang);
            v5spr.xvel = B_LITTLE16(v5spr.xvel);
            v5spr.yvel = B_LITTLE16(v5spr.yvel);
            v5spr.zvel = B_LITTLE16(v5spr.zvel);
            v5spr.owner = B_LITTLE16(v5spr.owner);
            v5spr.sectnum = B_LITTLE16(v5spr.sectnum);
            v5spr.statnum = B_LITTLE16(v5spr.statnum);
            v5spr.lotag = B_LITTLE16(v5spr.lotag);
            v5spr.hitag = B_LITTLE16(v5spr.hitag);
            v5spr.extra = B_LITTLE16(v5spr.extra);
            break;
        case 6:
            kread(fil,&v6spr,sizeof(struct spritetypev6));
            v6spr.x = B_LITTLE32(v6spr.x);
            v6spr.y = B_LITTLE32(v6spr.y);
            v6spr.z = B_LITTLE32(v6spr.z);
            v6spr.cstat = B_LITTLE16(v6spr.cstat);
            v6spr.picnum = B_LITTLE16(v6spr.picnum);
            v6spr.ang = B_LITTLE16(v6spr.ang);
            v6spr.xvel = B_LITTLE16(v6spr.xvel);
            v6spr.yvel = B_LITTLE16(v6spr.yvel);
            v6spr.zvel = B_LITTLE16(v6spr.zvel);
            v6spr.owner = B_LITTLE16(v6spr.owner);
            v6spr.sectnum = B_LITTLE16(v6spr.sectnum);
            v6spr.statnum = B_LITTLE16(v6spr.statnum);
            v6spr.lotag = B_LITTLE16(v6spr.lotag);
            v6spr.hitag = B_LITTLE16(v6spr.hitag);
            v6spr.extra = B_LITTLE16(v6spr.extra);
            break;
        }

        switch (mapversion)
        {
        case 5:
            convertv5sprv6(&v5spr,&v6spr);
        case 6:
            convertv6sprv7(&v6spr,&sprite[i]);
        }

        check_sprite(i);
    }

    kclose(fil);
    // Done reading file.

    return finish_loadboard(dapos, dacursectnum, numsprites, 0);
}


#ifdef POLYMER
void delete_maphack_lights()
{
    int32_t i;
    for (i=0; i<maphacklightcnt; i++)
    {
        if (maphacklight[i] >= 0)
            polymer_deletelight(maphacklight[i]);
        maphacklight[i] = -1;
    }

    maphacklightcnt = 0;
}
#else
void delete_maphack_lights() {}
#endif

//
// loadmaphack
//
int32_t loadmaphack(const char *filename)
{
    enum
    {
        T_SPRITE = 0,
        T_ANGOFF,
        T_NOMODEL,
        T_NOANIM,
        T_PITCH,
        T_ROLL,
        T_MDXOFF,
        T_MDYOFF,
        T_MDZOFF,
        T_AWAY1,
        T_AWAY2,
        T_LIGHT,
    };

    static struct { const char *text; int32_t tokenid; } legaltokens[] =
    {
        { "sprite", T_SPRITE },
        { "angleoff", T_ANGOFF },
        { "angoff", T_ANGOFF },
        { "notmd2", T_NOMODEL },
        { "notmd3", T_NOMODEL },
        { "notmd", T_NOMODEL },
        { "nomd2anim", T_NOANIM },
        { "nomd3anim", T_NOANIM },
        { "nomdanim", T_NOANIM },
        { "pitch", T_PITCH },
        { "roll", T_ROLL },
        { "mdxoff", T_MDXOFF },
        { "mdyoff", T_MDYOFF },
        { "mdzoff", T_MDZOFF },
        { "away1", T_AWAY1 },
        { "away2", T_AWAY2 },
        { "light", T_LIGHT },
        { NULL, -1 }
    };

    scriptfile *script = NULL;
    char *tok, *cmdtokptr;
    int32_t i;
    int32_t whichsprite = -1;
    static char fn[BMAX_PATH];

#ifdef POLYMER
    int32_t toomanylights = 0;

    delete_maphack_lights();
#endif

    if (filename)
    {
        Bmemset(spriteext, 0, sizeof(spriteext_t) * MAXSPRITES);
        Bmemset(spritesmooth, 0, sizeof(spritesmooth_t) *(MAXSPRITES+MAXUNIQHUDID));
        Bstrcpy(fn, filename);
        script = scriptfile_fromfile(filename);
    }
    else if (fn[0])
    {
        // re-load
        // XXX: what if we changed between levels? Could a wrong maphack be loaded?
        script = scriptfile_fromfile(fn);
    }

    if (!script)
    {
        fn[0] = 0;
        return -1;
    }

    while (1)
    {
        tok = scriptfile_gettoken(script);
        if (!tok) break;
        for (i=0; legaltokens[i].text; i++) if (!Bstrcasecmp(tok,legaltokens[i].text)) break;
        cmdtokptr = script->ltextptr;

        if (!filename && legaltokens[i].tokenid != T_LIGHT) continue;

        switch (legaltokens[i].tokenid)
        {
        case T_SPRITE:     // sprite <xx>
            if (scriptfile_getnumber(script, &whichsprite)) break;

            if ((unsigned)whichsprite >= (unsigned)MAXSPRITES)
            {
                // sprite number out of range
                initprintf("Sprite number out of range 0-%d on line %s:%d\n",
                           MAXSPRITES-1,script->filename, scriptfile_getlinum(script,cmdtokptr));
                whichsprite = -1;
                break;
            }

            break;
        case T_ANGOFF:     // angoff <xx>
        {
            int32_t ang;
            if (scriptfile_getnumber(script, &ang)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring angle offset directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].angoff = (int16_t)ang;
        }
        break;
        case T_NOMODEL:      // notmd
            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring not-MD2/MD3 directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].flags |= SPREXT_NOTMD;
            break;
        case T_NOANIM:      // nomdanim
            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring no-MD2/MD3-anim directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].flags |= SPREXT_NOMDANIM;
            break;
        case T_PITCH:     // pitch <xx>
        {
            int32_t pitch;
            if (scriptfile_getnumber(script, &pitch)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring pitch directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].pitch = (int16_t)pitch;
        }
        break;
        case T_ROLL:     // roll <xx>
        {
            int32_t roll;
            if (scriptfile_getnumber(script, &roll)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring roll directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].roll = (int16_t)roll;
        }
        break;
        case T_MDXOFF:     // mdxoff <xx>
        {
            int32_t i;
            if (scriptfile_getnumber(script, &i)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring mdxoff directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].offset.x = i;
        }
        break;
        case T_MDYOFF:     // mdyoff <xx>
        {
            int32_t i;
            if (scriptfile_getnumber(script, &i)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring mdyoff directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].offset.y = i;
        }
        break;
        case T_MDZOFF:     // mdzoff <xx>
        {
            int32_t i;
            if (scriptfile_getnumber(script, &i)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring mdzoff directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].offset.z = i;
        }
        break;
        case T_AWAY1:      // away1
            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring moving away directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].flags |= SPREXT_AWAY1;
            break;
        case T_AWAY2:      // away2
            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring moving away directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].flags |= SPREXT_AWAY2;
            break;
#ifdef POLYMER
        case T_LIGHT:      // light sector x y z range r g b radius faderadius angle horiz minshade maxshade priority tilenum
        {
            int32_t value;
            int16_t lightid;
#pragma pack(push,1)
            _prlight light;
#pragma pack(pop)
            if (toomanylights)
                break;  // ignore further light defs

            scriptfile_getnumber(script, &value);
            light.sector = value;
            scriptfile_getnumber(script, &value);
            light.x = value;
            scriptfile_getnumber(script, &value);
            light.y = value;
            scriptfile_getnumber(script, &value);
            light.z = value;
            scriptfile_getnumber(script, &value);
            light.range = value;
            scriptfile_getnumber(script, &value);
            light.color[0] = value;
            scriptfile_getnumber(script, &value);
            light.color[1] = value;
            scriptfile_getnumber(script, &value);
            light.color[2] = value;
            scriptfile_getnumber(script, &value);
            light.radius = value;
            scriptfile_getnumber(script, &value);
            light.faderadius = value;
            scriptfile_getnumber(script, &value);
            light.angle = value;
            scriptfile_getnumber(script, &value);
            light.horiz = value;
            scriptfile_getnumber(script, &value);
            light.minshade = value;
            scriptfile_getnumber(script, &value);
            light.maxshade = value;
            scriptfile_getnumber(script, &value);
            light.priority = value;
            scriptfile_getnumber(script, &value);
            light.tilenum = value;

            light.publicflags.emitshadow = 1;
            light.publicflags.negative = 0;

            if (getrendermode() == REND_POLYMER)
            {
                if (maphacklightcnt == PR_MAXLIGHTS)
                {
                    initprintf("warning: max light count %d exceeded, "
                               "ignoring further light defs\n", PR_MAXLIGHTS);
                    toomanylights = 1;
                    break;
                }

                lightid = polymer_addlight(&light);
                if (lightid>=0)
                    maphacklight[maphacklightcnt++] = lightid;
            }

            break;
        }
#endif // POLYMER

        default:
            // unrecognised token
            break;
        }
    }

    scriptfile_close(script);
    return 0;
}


#ifdef NEW_MAP_FORMAT
LUNATIC_CB int32_t (*saveboard_maptext)(const char *filename, const vec3_t *dapos, int16_t daang, int16_t dacursectnum);
#endif

// Get map version of external map format (<10: old binary format, ==10: new
// 'VX' map-text format).
static int32_t get_mapversion(void)
{
#ifdef YAX_ENABLE
    if (numyaxbunches > 0)
# ifdef NEW_MAP_FORMAT
        return 10;
# else
        return 9;
# endif
#endif

#ifdef NEW_MAP_FORMAT
    {
        int32_t i;
        for (i=0; i<numwalls; i++)
            if (wall[i].blend != 0)
                return 10;
    }
#endif
    if (numsectors > MAXSECTORSV7 || numwalls > MAXWALLSV7 || Numsprites > MAXSPRITESV7)
        return 8;

    return 7;
}

//
// saveboard
//
int32_t saveboard(const char *filename, const vec3_t *dapos, int16_t daang, int16_t dacursectnum)
{
    int16_t numsprites, ts;
    int32_t i, j, fil, tl;

    // First, some checking.
    for (j=0; j<MAXSPRITES; j++)
    {
        if ((unsigned)sprite[j].statnum > MAXSTATUS)
        {
            initprintf("Map error: sprite #%d(%d,%d) with an illegal statnum(%d)\n",
                       j,TrackerCast(sprite[j].x),TrackerCast(sprite[j].y),TrackerCast(sprite[j].statnum));
            changespritestat(j,0);
        }

        if ((unsigned)sprite[j].sectnum > MAXSECTORS)
        {
            initprintf("Map error: sprite #%d(%d,%d) with an illegal sectnum(%d)\n",
                       j,TrackerCast(sprite[j].x),TrackerCast(sprite[j].y),TrackerCast(sprite[j].sectnum));
            changespritesect(j,0);
        }
    }

    // Count the number of sprites.
    numsprites = 0;
    for (j=0; j<MAXSPRITES; j++)
    {
        if (sprite[j].statnum != MAXSTATUS)
            numsprites++;
    }

    // Check consistency of sprite-in-the-world predicate (.statnum != MAXSTATUS)
    // and the engine-reported number of sprites 'Numsprites'.
    Bassert(numsprites == Numsprites);

    // Determine the map version.
    mapversion = get_mapversion();

#ifdef NEW_MAP_FORMAT
    if (mapversion == 10)
    {
        initprintf("Saving of TROR maps not yet accessible in the Lunatic preview build\n");
        return -1;
//        return saveboard_maptext(filename, dapos, daang, dacursectnum);
    }
#endif

    fil = Bopen(filename, BO_BINARY|BO_TRUNC|BO_CREAT|BO_WRONLY, BS_IREAD|BS_IWRITE);

    if (fil == -1)
    {
        initprintf("Couldn't open \"%s\" for writing: %s\n", filename, strerror(errno));
        return -1;
    }

    tl = B_LITTLE32(mapversion);    Bwrite(fil,&tl,4);

    tl = B_LITTLE32(dapos->x);      Bwrite(fil,&tl,4);
    tl = B_LITTLE32(dapos->y);      Bwrite(fil,&tl,4);
    tl = B_LITTLE32(dapos->z);      Bwrite(fil,&tl,4);
    ts = B_LITTLE16(daang);        Bwrite(fil,&ts,2);
    ts = B_LITTLE16(dacursectnum); Bwrite(fil,&ts,2);

    ts = B_LITTLE16(numsectors);    Bwrite(fil,&ts,2);

    while (1)  // if, really
    {
        sectortypev7 *const tsect = (sectortypev7 *)Xmalloc(sizeof(sectortypev7) * numsectors);
        walltypev7 *twall;

#ifdef NEW_MAP_FORMAT
        for (i=0; i<numsectors; i++)
            copy_v7_from_vx_sector(&tsect[i], &sector[i]);
#else
        Bmemcpy(tsect, sector, sizeof(sectortypev7)*numsectors);
#endif

        for (i=0; i<numsectors; i++)
        {
            sectortypev7 *const sec = &tsect[i];

            sec->wallptr       = B_LITTLE16(sec->wallptr);
            sec->wallnum       = B_LITTLE16(sec->wallnum);
            sec->ceilingz      = B_LITTLE32(sec->ceilingz);
            sec->floorz        = B_LITTLE32(sec->floorz);
            sec->ceilingstat   = B_LITTLE16(sec->ceilingstat);
            sec->floorstat     = B_LITTLE16(sec->floorstat);
            sec->ceilingpicnum = B_LITTLE16(sec->ceilingpicnum);
            sec->ceilingheinum = B_LITTLE16(sec->ceilingheinum);
            sec->floorpicnum   = B_LITTLE16(sec->floorpicnum);
            sec->floorheinum   = B_LITTLE16(sec->floorheinum);
            sec->lotag         = B_LITTLE16(sec->lotag);
            sec->hitag         = B_LITTLE16(sec->hitag);
            sec->extra         = B_LITTLE16(sec->extra);
#ifdef YAX_ENABLE__COMPAT
            if (editstatus == 0)
            {
                // if in-game, pack game-time bunchnum data back into structs
                int32_t cf, bn;

                for (cf=0; cf<2; cf++)
                    if ((bn=yax_getbunch(i, cf)) >= 0)
                        YAX_PTRBUNCHNUM(tsect, i, cf) = bn;
            }
#endif
        }

        Bwrite(fil, tsect, sizeof(sectortypev7)*numsectors);
        Bfree(tsect);

        ts = B_LITTLE16(numwalls);
        Bwrite(fil,&ts,2);

        twall = (walltypev7 *)Xmalloc(sizeof(walltypev7) * numwalls);

#ifdef NEW_MAP_FORMAT
        for (i=0; i<numwalls; i++)
            copy_v7_from_vx_wall(&twall[i], &wall[i]);
#else
        Bmemcpy(twall, wall, sizeof(walltypev7)*numwalls);
#endif

        for (i=0; i<numwalls; i++)
        {
            walltypev7 *const wal = &twall[i];

            wal->x          = B_LITTLE32(wal->x);
            wal->y          = B_LITTLE32(wal->y);
            wal->point2     = B_LITTLE16(wal->point2);
            wal->nextwall   = B_LITTLE16(wal->nextwall);
            wal->nextsector = B_LITTLE16(wal->nextsector);
            wal->cstat      = B_LITTLE16(wal->cstat);
            wal->picnum     = B_LITTLE16(wal->picnum);
            wal->overpicnum = B_LITTLE16(wal->overpicnum);
#ifdef YAX_ENABLE__COMPAT
            if (editstatus == 0)
            {
                // if in-game, pack game-time yax-nextwall data back into structs
                int16_t ynw;
                if ((ynw=yax_getnextwall(i, YAX_CEILING))>=0)
                    YAX_PTRNEXTWALL(twall,i,YAX_CEILING) = ynw;
                if ((ynw=yax_getnextwall(i, YAX_FLOOR))>=0)
                    YAX_PTRNEXTWALL(twall,i,YAX_FLOOR) = ynw;
            }
#endif
            wal->lotag      = B_LITTLE16(wal->lotag);
            wal->hitag      = B_LITTLE16(wal->hitag);
            wal->extra      = B_LITTLE16(wal->extra);
        }

        Bwrite(fil, twall, sizeof(walltypev7)*numwalls);
        Bfree(twall);

        ts = B_LITTLE16(numsprites);    Bwrite(fil,&ts,2);

        if (numsprites > 0)
        {
            spritetype *const tspri = (spritetype *)Xmalloc(sizeof(spritetype) * numsprites);
            spritetype *spri = tspri;

            for (j=0; j<MAXSPRITES; j++)
            {
                if (sprite[j].statnum != MAXSTATUS)
                {
                    Bmemcpy(spri, &sprite[j], sizeof(spritetype));
                    spri->x       = B_LITTLE32(spri->x);
                    spri->y       = B_LITTLE32(spri->y);
                    spri->z       = B_LITTLE32(spri->z);
                    spri->cstat   = B_LITTLE16(spri->cstat);
                    spri->picnum  = B_LITTLE16(spri->picnum);
                    spri->sectnum = B_LITTLE16(spri->sectnum);
                    spri->statnum = B_LITTLE16(spri->statnum);
                    spri->ang     = B_LITTLE16(spri->ang);
                    spri->owner   = B_LITTLE16(spri->owner);
                    spri->xvel    = B_LITTLE16(spri->xvel);
                    spri->yvel    = B_LITTLE16(spri->yvel);
                    spri->zvel    = B_LITTLE16(spri->zvel);
                    spri->lotag   = B_LITTLE16(spri->lotag);
                    spri->hitag   = B_LITTLE16(spri->hitag);
                    spri->extra   = B_LITTLE16(spri->extra);
                    spri++;
                }
            }

            Bwrite(fil, tspri, sizeof(spritetype)*numsprites);
            Bfree(tspri);
        }

        Bclose(fil);
        return 0;
    }

    Bclose(fil);
    return -1;
}

#define YSAVES ((xdim*MAXSPRITES)>>7)

static void initsmost(void)
{
    int32_t i;
    // Needed for the game's TILT_SETVIEWTOTILE_320.
    const int32_t clamped_ydim = max(ydim, 320);

    struct
    {
        void **ptr;
        size_t size;
    } dynarray[] = {
          { (void **)&smost, YSAVES * sizeof(int16_t) },
          { (void **)&umost, xdim * sizeof(int16_t) },
          { (void **)&dmost, xdim * sizeof(int16_t) },
          { (void **)&startumost, xdim * sizeof(int16_t) },
          { (void **)&startdmost, xdim * sizeof(int16_t) },
          { (void **)&bakumost, xdim * sizeof(int16_t) },
          { (void **)&bakdmost, xdim * sizeof(int16_t) },
          { (void **)&uplc, xdim * sizeof(int16_t) },
          { (void **)&dplc, xdim * sizeof(int16_t) },
          { (void **)&uwall, xdim * sizeof(int16_t) },
          { (void **)&dwall, xdim * sizeof(int16_t) },
          { (void **)&swplc, xdim * sizeof(int32_t) },
          { (void **)&lplc, xdim * sizeof(int32_t) },
          { (void **)&swall, xdim * sizeof(int32_t) },
          { (void **)&lwall, (xdim + 4) * sizeof(int32_t) },
          { (void **)&radarang2, xdim * sizeof(int16_t) },
          { (void **)&dotp1, clamped_ydim * sizeof(intptr_t) },
          { (void **)&dotp2, clamped_ydim * sizeof(intptr_t) },
          { (void **)&lastx, clamped_ydim * sizeof(int32_t) },
      };

    for (i = 0; i < (signed)ARRAY_SIZE(dynarray); i++)
    {
        Baligned_free(*dynarray[i].ptr);

        *dynarray[i].ptr = Xaligned_alloc(16, dynarray[i].size);
    }

    ysavecnt = YSAVES;
    nodesperline = tabledivide32_noinline(YSAVES, ydim);
}

#ifdef USE_OPENGL
static void PolymostProcessVoxels(void)
{
    if (!g_haveVoxels)
        return;

    g_haveVoxels = 0;

    OSD_Printf("Generating voxel models for Polymost. This may take a while...\n");
    nextpage();

    for (int32_t i=0; i<MAXVOXELS; i++)
    {
        if (voxfilenames[i])
        {
            voxmodels[i] = voxload(voxfilenames[i]);
            DO_FREE_AND_NULL(voxfilenames[i]);
        }
    }
}
#endif

//
// setgamemode
//
// JBF: davidoption now functions as a windowed-mode flag (0 == windowed, 1 == fullscreen)
extern char videomodereset;
int32_t setgamemode(char davidoption, int32_t daxdim, int32_t daydim, int32_t dabpp)
{
    int32_t j;

#ifdef USE_OPENGL
    extern char nogl;

    if (nogl) dabpp = 8;
#endif
    daxdim = max(320, daxdim);
    daydim = max(200, daydim);

    if (in3dmode() && videomodereset == 0 &&
            (davidoption == fullscreen) && (xdim == daxdim) && (ydim == daydim) && (bpp == dabpp))
        return(0);

    Bstrcpy(kensmessage,"!!!! BUILD engine&tools programmed by Ken Silverman of E.G. RI."
           "  (c) Copyright 1995 Ken Silverman.  Summary:  BUILD = Ken. !!!!");
    //  if (getkensmessagecrc(FP_OFF(kensmessage)) != 0x56c764d4)
    //      { OSD_Printf("Nice try.\n"); Bexit(0); }

    //if (checkvideomode(&daxdim, &daydim, dabpp, davidoption)<0) return (-1);

    //bytesperline is set in this function

    j = bpp;

    g_lastpalettesum = 0;
    if (setvideomode(daxdim,daydim,dabpp,davidoption) < 0) return(-1);

    // Workaround possible bugs in the GL driver
    makeasmwriteable();

#ifdef USE_OPENGL
    if (dabpp > 8) rendmode = glrendmode;    // GL renderer
    else if (dabpp == 8 && j > 8) rendmode = REND_CLASSIC;
#endif

    xdim = daxdim; ydim = daydim;

#ifdef USE_OPENGL
    fxdim = (float) xdim;
    fydim = (float) ydim;
#endif

    initsmost();

#ifdef HIGH_PRECISION_SPRITE
    swallf = (float *) Xrealloc(swallf, xdim * sizeof(float));
#endif

    Bfree(lookups);

    j = ydim*4;  //Leave room for horizlookup&horizlookup2
    lookups = (int32_t *)Xmalloc(2*j*sizeof(lookups[0]));

    horizlookup = lookups;
    horizlookup2 = lookups + j;
    horizycent = ((ydim*4)>>1);

    //Force drawrooms to call dosetaspect & recalculate stuff
    oxyaspect = oxdimen = oviewingrange = -1;

    calc_ylookup(bytesperline, ydim);

    setview(0L,0L,xdim-1,ydim-1);
    clearallviews(0L);
    setbrightness(curbrightness,0,0);

    if (searchx < 0) { searchx = halfxdimen; searchy = (ydimen>>1); }

#ifdef USE_OPENGL
    if (getrendermode() == REND_POLYMOST)
        PolymostProcessVoxels();

    if (getrendermode() >= REND_POLYMOST)
    {
        polymost_glreset();
        polymost_glinit();
    }
# ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
    {
        if (!polymer_init())
            rendmode = REND_POLYMOST;
    }
#endif
#endif
    qsetmode = 200;
    return(0);
}


//
// nextpage
//
void nextpage(void)
{
    int32_t i;
    permfifotype *per;

    //char snotbuf[32];
    //j = 0; k = 0;
    //for(i=0;i<4096;i++)
    //   if (waloff[i] != 0)
    //   {
    //      sprintf(snotbuf,"%d-%d",i,tilesizx[i]*tilesizy[i]);
    //      printext256((j>>5)*40+32,(j&31)*6,walock[i]>>3,-1,snotbuf,1);
    //      k += tilesizx[i]*tilesizy[i];
    //      j++;
    //   }
    //sprintf(snotbuf,"Total: %d",k);
    //printext256((j>>5)*40+32,(j&31)*6,31,-1,snotbuf,1);

    switch (qsetmode)
    {
    case 200:
        begindrawing(); //{{{
        for (i=permtail; i!=permhead; i=((i+1)&(MAXPERMS-1)))
        {
            per = &permfifo[i];
            if ((per->pagesleft > 0) && (per->pagesleft <= numpages))
                dorotatesprite(per->sx,per->sy,per->z,per->a,per->picnum,
                               per->dashade,per->dapalnum,per->dastat,per->daalpha,per->dablend,
                               per->cx1,per->cy1,per->cx2,per->cy2,per->uniqid);
        }
        enddrawing();   //}}}

        OSD_Draw();
        showframe(0);

        begindrawing(); //{{{
        for (i=permtail; i!=permhead; i=((i+1)&(MAXPERMS-1)))
        {
            per = &permfifo[i];
            if (per->pagesleft >= 130)
                dorotatesprite(per->sx,per->sy,per->z,per->a,per->picnum,
                               per->dashade,per->dapalnum,per->dastat,per->daalpha,per->dablend,
                               per->cx1,per->cy1,per->cx2,per->cy2,per->uniqid);

            if (per->pagesleft&127) per->pagesleft--;
            if (((per->pagesleft&127) == 0) && (i == permtail))
                permtail = ((permtail+1)&(MAXPERMS-1));
        }
        enddrawing();   //}}}
        break;

    case 350:
    case 480:
        break;
    }
    faketimerhandler();

    if ((totalclock >= lastageclock+CACHEAGETIME) || (totalclock < lastageclock))
        { lastageclock = totalclock; agecache(); }

#ifdef USE_OPENGL
    omdtims = mdtims; mdtims = getticks();

    for (int i = 0; i < Numsprites; i++)
        if ((mdpause && spriteext[i].mdanimtims) || (spriteext[i].flags & SPREXT_NOMDANIM))
            spriteext[i].mdanimtims += mdtims - omdtims;
#endif

    beforedrawrooms = 1;
    numframes++;
}

//
// ART loading
//

void E_CreateDummyTile(int32_t const tile)
{
    faketile[tile>>3] |= pow2char[tile&7];
    DO_FREE_AND_NULL(faketiledata[tile]);
}

void E_CreateFakeTile(int32_t const tile, int32_t tsiz, char const * const buffer)
{
    faketiledata[tile] = (char *)Xrealloc(faketiledata[tile], LZ4_compressBound(tsiz));

    if ((tsiz = LZ4_compress(buffer, faketiledata[tile], tsiz)) != -1)
    {
        faketiledata[tile] = (char *)Xrealloc(faketiledata[tile], tsiz);
        faketile[tile>>3] |= pow2char[tile&7];
    }
    else
    {
        DO_FREE_AND_NULL(faketiledata[tile]);
        faketile[tile>>3] &= ~pow2char[tile&7];
    }
}

void E_UndefineTile(int32_t const tile)
{
    tilesiz[tile].x = 0;
    tilesiz[tile].y = 0;
    picsiz[tile] = 0;

    // CACHE1D_FREE
    walock[tile] = 1;
    waloff[tile] = 0;

    DO_FREE_AND_NULL(faketiledata[tile]);
    faketile[tile>>3] &= ~pow2char[tile&7];

    Bmemset(&picanm[tile], 0, sizeof(picanm_t));
}

static void set_picsiz(int32_t picnum)
{
    int32_t j;

    j = 15;
    while ((j > 1) && (pow2long[j] > tilesiz[picnum].x))
        j--;
    picsiz[picnum] = j;

    j = 15;
    while ((j > 1) && (pow2long[j] > tilesiz[picnum].y))
        j--;
    picsiz[picnum] |= j<<4;
}

void set_tilesiz(int32_t picnum, int16_t dasizx, int16_t dasizy)
{
    tilesiz[picnum].x = dasizx;
    tilesiz[picnum].y = dasizy;

    set_picsiz(picnum);
}

int32_t tile_exists(int32_t picnum)
{
    if (waloff[picnum] == 0)
        loadtile(picnum);

    return (waloff[picnum] != 0 && tilesiz[picnum].x > 0 && tilesiz[picnum].y > 0);
}

int32_t E_ReadArtFileHeader(int32_t const fil, char const * const fn, artheader_t * const local)
{
    int32_t artversion;
    kread(fil,&artversion,4); artversion = B_LITTLE32(artversion);
    if (artversion != 1)
    {
        initprintf("loadpics: Invalid art file version in %s\n", fn);
        kclose(fil);
        return 1;
    }

    int32_t numtiles_dummy;
    kread(fil,&numtiles_dummy,4);

    kread(fil,&local->tilestart,4); local->tilestart = B_LITTLE32(local->tilestart);
    kread(fil,&local->tileend,4);   local->tileend   = B_LITTLE32(local->tileend);

    if ((uint32_t)local->tilestart >= MAXUSERTILES || (uint32_t)local->tileend >= MAXUSERTILES)
    {
        initprintf("loadpics: Invalid localtilestart or localtileend in %s\n", fn);
        kclose(fil);
        return 1;
    }
    if (local->tileend < local->tilestart)
    {
        initprintf("loadpics: localtileend < localtilestart in %s\n", fn);
        kclose(fil);
        return 1;
    }

    local->numtiles = (local->tileend-local->tilestart+1);

    return 0;
}

int32_t E_ReadArtFileHeaderFromBuffer(uint8_t const * const buf, artheader_t * const local)
{
    int32_t const artversion = B_LITTLE32(B_UNBUF32(&buf[0]));
    if (EDUKE32_PREDICT_FALSE(artversion != 1))
    {
        initprintf("loadpics: Invalid art file version\n");
        return 1;
    }

    local->tilestart = B_LITTLE32(B_UNBUF32(&buf[8]));
    local->tileend   = B_LITTLE32(B_UNBUF32(&buf[12]));

    if (EDUKE32_PREDICT_FALSE((unsigned)local->tilestart >= MAXUSERTILES || (unsigned)local->tileend >= MAXUSERTILES))
    {
        initprintf("loadpics: Invalid localtilestart or localtileend\n");
        return 1;
    }
    if (EDUKE32_PREDICT_FALSE(local->tileend < local->tilestart))
    {
        initprintf("loadpics: localtileend < localtilestart\n");
        return 1;
    }

    local->numtiles = (local->tileend-local->tilestart+1);

    return 0;
}

int32_t E_CheckUnitArtFileHeader(uint8_t const * const buf, int32_t length)
{
    if (EDUKE32_PREDICT_FALSE(length <= ARTv1_UNITOFFSET))
        return -1;

    artheader_t local;
    if (EDUKE32_PREDICT_FALSE(E_ReadArtFileHeaderFromBuffer(buf, &local) != 0))
        return -2;

    if (EDUKE32_PREDICT_FALSE(local.numtiles != 1))
        return -3;

    return 0;
}

void E_ConvertARTv1picanmToMemory(int32_t const picnum)
{
    EDUKE32_STATIC_ASSERT(sizeof(picanm_t) == 4);
    EDUKE32_STATIC_ASSERT(PICANM_ANIMTYPE_MASK == 192);

    picanm_t * const thispicanm = &picanm[picnum];

    // Old on-disk format: anim type is in the 2 highest bits of the lowest byte.
    thispicanm->sf &= ~192;
    thispicanm->sf |= thispicanm->num&192;
    thispicanm->num &= ~192;

    // don't allow setting texhitscan/nofullbright from ART
    thispicanm->sf &= ~PICANM_MISC_MASK;
}

void E_ReadArtFileTileInfo(int32_t const fil, artheader_t const * const local)
{
    int16_t *tilesizx = (int16_t *)Xmalloc(local->numtiles * sizeof(int16_t));
    int16_t *tilesizy = (int16_t *)Xmalloc(local->numtiles * sizeof(int16_t));
    kread(fil, tilesizx, local->numtiles*sizeof(int16_t));
    kread(fil, tilesizy, local->numtiles*sizeof(int16_t));
    kread(fil, &picanm[local->tilestart], local->numtiles*sizeof(picanm_t));

    for (int32_t i=local->tilestart; i<=local->tileend; i++)
    {
        tilesiz[i].x = B_LITTLE16(tilesizx[i-local->tilestart]);
        tilesiz[i].y = B_LITTLE16(tilesizy[i-local->tilestart]);

        E_ConvertARTv1picanmToMemory(i);
    }

    DO_FREE_AND_NULL(tilesizx);
    DO_FREE_AND_NULL(tilesizy);
}

void E_ReadArtFileIntoFakeData(int32_t const fil, artheader_t const * const local)
{
    char *buffer = NULL;
    int32_t buffersize = 0;

    for (int32_t i=local->tilestart; i<=local->tileend; i++)
    {
        int32_t dasiz = tilesiz[i].x * tilesiz[i].y;

        if (dasiz == 0)
        {
            E_UndefineTile(i);
            continue;
        }

        maybe_grow_buffer(&buffer, &buffersize, dasiz);

        kread(fil, buffer, dasiz);

        E_CreateFakeTile(i, dasiz, buffer);
    }

    DO_FREE_AND_NULL(buffer);
}

static const char *E_GetArtFileName(int32_t tilefilei)
{
    if (tilefilei >= MAXARTFILES_BASE)
    {
        int32_t o = mapartfnXXofs;
        tilefilei -= MAXARTFILES_BASE;

        mapartfilename[o+1] = '0' + tilefilei%10;
        mapartfilename[o+0] = '0' + (tilefilei/10)%10;

        return mapartfilename;
    }
    else
    {
        artfilename[7] = '0' + tilefilei%10;
        artfilename[6] = '0' + (tilefilei/10)%10;
        artfilename[5] = '0' + (tilefilei/100)%10;

        return artfilename;
    }
}

// Returns:
//  0: successfully read ART file
// >0: error with the ART file
// -1: ART file does not exist
//<-1: per-map ART issue
static int32_t E_ReadArtFileOfID(int32_t tilefilei)
{
    const char *fn = E_GetArtFileName(tilefilei);
    const int32_t permap = (tilefilei >= MAXARTFILES_BASE);  // is it a per-map ART file?
    int32_t fil;

    if ((fil = kopen4load(fn,0)) != -1)
    {
#ifdef WITHKPLIB
        if (permap && cache1d_file_fromzip(fil))
        {
            initprintf("loadpics: per-map ART file \"%s\": can't be read from a ZIP file\n", fn);
            kclose(fil);
            return -2;
        }
#endif

        artheader_t local;
        int32_t headerval = E_ReadArtFileHeader(fil, fn, &local);
        if (headerval != 0)
            return headerval;

        if (permap)
        {
            // Check whether we can evict existing tiles to make place for
            // per-map ART ones.
            for (int32_t i=local.tilestart; i<=local.tileend; i++)
            {
                // Tiles having dummytile replacements or those that are
                // cache1d-locked can't be replaced.
                if (faketile[i>>3] & pow2char[i&7] || walock[i] >= 200)
                {
                    initprintf("loadpics: per-map ART file \"%s\": "
                               "tile %d has dummytile or is locked\n", fn, i);
                    kclose(fil);
                    return -3;
                }
            }

            // Free existing tiles from the cache1d. CACHE1D_FREE
            Bmemset(&waloff[local.tilestart], 0, local.numtiles*sizeof(intptr_t));
            Bmemset(&walock[local.tilestart], 1, local.numtiles*sizeof(walock[0]));
        }

        E_ReadArtFileTileInfo(fil, &local);

        if (cache1d_file_fromzip(fil))
        {
            E_ReadArtFileIntoFakeData(fil, &local);
        }
        else
        {
            int32_t offscount = 4+4+4+4+(local.numtiles<<3);

            for (int32_t i=local.tilestart; i<=local.tileend; i++)
            {
                int32_t dasiz = tilesiz[i].x * tilesiz[i].y;

                tilefilenum[i] = tilefilei;
                tilefileoffs[i] = offscount;

                offscount += dasiz;
               // artsize += ((dasiz+15)&0xfffffff0);
            }
        }

#ifdef DEBUGGINGAIDS
        if (permap)
            initprintf("Read in per-map ART file \"%s\"\n", fn);
#endif
        kclose(fil);
        return 0;
    }

    return -1;
}

//
// loadpics
//
int32_t loadpics(const char *filename, int32_t askedsize)
{
    int32_t tilefilei;

    Bstrncpyz(artfilename, filename, sizeof(artfilename));

    Bmemset(&tilesiz[0], 0, sizeof(vec2_t) * MAXTILES);
    Bmemset(picanm, 0, sizeof(picanm));

//    artsize = 0;

    for (tilefilei=0; tilefilei<MAXARTFILES_BASE; tilefilei++)
        E_ReadArtFileOfID(tilefilei);

    Bmemset(gotpic, 0, sizeof(gotpic));

    //cachesize = min((int32_t)((Bgetsysmemsize()/100)*60),max(artsize,askedsize));
    if (Bgetsysmemsize() <= (uint32_t)askedsize)
        cachesize = (Bgetsysmemsize()/100)*60;
    else
        cachesize = askedsize;

    // NOTE: this doesn't make a lot of sense on modern OSs...
    while ((pic = Bmalloc(cachesize)) == NULL)
    {
        cachesize -= 65536;
        if (cachesize < 65536)
            return -1;
    }
    initcache((intptr_t)pic, cachesize);

    E_RecalcPicSiz();

    artfil = -1;
    artfilnum = -1;
    artfilplc = 0L;

    return 0;
}


//
// loadtile
//
static void postloadtile(int16_t tilenume);

void loadtile(int16_t tilenume)
{
    int32_t dasiz;

    if ((unsigned)tilenume >= (unsigned)MAXTILES) return;
    if ((dasiz = tilesiz[tilenume].x*tilesiz[tilenume].y) <= 0) return;

    // Allocate storage if necessary.
    if (waloff[tilenume] == 0)
    {
        walock[tilenume] = 199;
        allocache(&waloff[tilenume],dasiz,&walock[tilenume]);
    }

    E_LoadTileIntoBuffer(tilenume, dasiz, (char *)waloff[tilenume]);

    postloadtile(tilenume);
}

void E_LoadTileIntoBuffer(int16_t tilenume, int32_t dasiz, char *buffer)
{
    // dummy tiles for highres replacements and tilefromtexture definitions

    if (faketile[tilenume>>3] & pow2char[tilenume&7])
    {
        if (faketiledata[tilenume] != NULL)
            LZ4_decompress_fast(faketiledata[tilenume], buffer, dasiz);

        faketimerhandler();
        return;
    }

    int32_t const i = tilefilenum[tilenume];

    // Potentially switch open ART file.
    if (i != artfilnum)
    {
        const char *fn;

        if (artfil != -1)
            kclose(artfil);

        fn = E_GetArtFileName(i);

        artfil = kopen4load(fn, 0);
        if (artfil == -1)
        {
            initprintf("Failed opening ART file \"%s\"!\n", fn);
            uninitengine();
            Bexit(11);
        }

        artfilnum = i;
        artfilplc = 0L;

        faketimerhandler();
    }

    // Seek to the right position.
    if (artfilplc != tilefileoffs[tilenume])
    {
        klseek(artfil, tilefileoffs[tilenume], BSEEK_SET);
        faketimerhandler();
    }

    kread(artfil, buffer, dasiz);
    faketimerhandler();
    artfilplc = tilefileoffs[tilenume]+dasiz;
}

static void postloadtile(int16_t tilenume)
{
#if !defined DEBUG_TILESIZY_512 && !defined DEBUG_TILEOFFSETS
    UNREFERENCED_PARAMETER(tilenume);
#endif
#ifdef DEBUG_TILESIZY_512
    if (tilesizy[tilenume] >= 512)
    {
        int32_t i;
        char *p = (char *)waloff[tilenume];
        for (i=0; i<tilesizx[tilenume]*tilesizy[tilenume]; i++)
            p[i] = i;
    }
#endif
#ifdef DEBUG_TILEOFFSETS
    // Add some dark blue marker lines to STEAM and CEILINGSTEAM.
    // See test_tileoffsets.map.
    if (tilenume==1250 || tilenume==1255)
    {
        char *p = (char *)waloff[tilenume];
        p[0] = p[1] = p[2] = p[3] = 254;
    }

    // Add some offset to the cocktail glass neon sign. It's more asymmetric
    // than the steam, and thus more suited to debugging the spatial
    // orientation of drawn sprites.
    if (tilenume==1008)
    {
        picanm[tilenume].xofs = 8;
        picanm[tilenume].yofs = 12;
    }
#endif
}

// Assumes pic has been initialized to zero.
void E_RenderArtDataIntoBuffer(palette_t * const pic, uint8_t const * const buf, int32_t const bufsizx, int32_t const sizx, int32_t const sizy)
{
    for (int32_t y = 0; y < sizy; y++)
    {
        palette_t * const picrow = &pic[bufsizx * y];

        for (int32_t x = 0; x < sizx; x++)
        {
            uint8_t index = buf[sizy * x + y];

            if (index != 255)
            {
                index *= 3;

                // pic is BGRA
                picrow[x].r = palette[index+2];
                picrow[x].g = palette[index+1];
                picrow[x].b = palette[index];
                picrow[x].f = 255;
            }
        }
    }
}

//
// allocatepermanenttile
//
intptr_t allocatepermanenttile(int16_t tilenume, int32_t xsiz, int32_t ysiz)
{
    int32_t dasiz;

    if (xsiz <= 0 || ysiz <= 0 || (unsigned)tilenume >= MAXTILES)
        return 0;

    dasiz = xsiz*ysiz;

    walock[tilenume] = 255;
    allocache(&waloff[tilenume], dasiz, &walock[tilenume]);

    set_tilesiz(tilenume, xsiz, ysiz);
    Bmemset(&picanm[tilenume], 0, sizeof(picanm_t));

    return waloff[tilenume];
}

//
// copytilepiece
//
void copytilepiece(int32_t tilenume1, int32_t sx1, int32_t sy1, int32_t xsiz, int32_t ysiz,
                   int32_t tilenume2, int32_t sx2, int32_t sy2)
{
    char *ptr1, *ptr2, dat;
    int32_t xsiz1, ysiz1, xsiz2, ysiz2, i, j, x1, y1, x2, y2;

    xsiz1 = tilesiz[tilenume1].x; ysiz1 = tilesiz[tilenume1].y;
    xsiz2 = tilesiz[tilenume2].x; ysiz2 = tilesiz[tilenume2].y;
    if ((xsiz1 > 0) && (ysiz1 > 0) && (xsiz2 > 0) && (ysiz2 > 0))
    {
        if (waloff[tilenume1] == 0) loadtile(tilenume1);
        if (waloff[tilenume2] == 0) loadtile(tilenume2);

        x1 = sx1;
        for (i=0; i<xsiz; i++)
        {
            y1 = sy1;
            for (j=0; j<ysiz; j++)
            {
                x2 = sx2+i;
                y2 = sy2+j;
                if ((x2 >= 0) && (y2 >= 0) && (x2 < xsiz2) && (y2 < ysiz2))
                {
                    ptr1 = (char *)(waloff[tilenume1] + x1*ysiz1 + y1);
                    ptr2 = (char *)(waloff[tilenume2] + x2*ysiz2 + y2);
                    dat = *ptr1;
                    if (dat != 255)
                        *ptr2 = *ptr1;
                }

                y1++; if (y1 >= ysiz1) y1 = 0;
            }
            x1++; if (x1 >= xsiz1) x1 = 0;
        }
    }
}

//
// qloadkvx
//
int32_t qloadkvx(int32_t voxindex, const char *filename)
{
    const int32_t fil = kopen4load(filename,0);
    if (fil == -1)
        return -1;

    int32_t lengcnt = 0;
    const int32_t lengtot = kfilelength(fil);

    for (int32_t i=0; i<MAXVOXMIPS; i++)
    {
        int32_t dasiz;
        kread(fil, &dasiz, 4); dasiz = B_LITTLE32(dasiz);

        //Must store filenames to use cacheing system :(
        voxlock[voxindex][i] = 200;
        allocache(&voxoff[voxindex][i], dasiz, &voxlock[voxindex][i]);

        char *ptr = (char *)voxoff[voxindex][i];
        kread(fil, ptr, dasiz);

        lengcnt += dasiz+4;
        if (lengcnt >= lengtot-768)
            break;
    }

    kclose(fil);

#ifdef USE_OPENGL
    if (voxmodels[voxindex])
    {
        voxfree(voxmodels[voxindex]);
        voxmodels[voxindex] = NULL;
    }

    Bfree(voxfilenames[voxindex]);
    voxfilenames[voxindex] = Bstrdup(filename);
    g_haveVoxels = 1;
#endif

    return 0;
}


//
// clipinsidebox
//
int32_t clipinsidebox(int32_t x, int32_t y, int16_t wallnum, int32_t walldist)
{
    walltype *wal;
    int32_t x1, y1, x2, y2;

    const int32_t r = walldist<<1;

    wal = &wall[wallnum];     x1 = wal->x+walldist-x; y1 = wal->y+walldist-y;
    wal = &wall[wal->point2]; x2 = wal->x+walldist-x; y2 = wal->y+walldist-y;

    if ((x1 < 0) && (x2 < 0)) return(0);
    if ((y1 < 0) && (y2 < 0)) return(0);
    if ((x1 >= r) && (x2 >= r)) return(0);
    if ((y1 >= r) && (y2 >= r)) return(0);

    x2 -= x1; y2 -= y1;
    if (x2*(walldist-y1) >= y2*(walldist-x1))  //Front
    {
        if (x2 > 0) x2 *= (0-y1); else x2 *= (r-y1);
        if (y2 > 0) y2 *= (r-x1); else y2 *= (0-x1);
        return(x2 < y2);
    }
    if (x2 > 0) x2 *= (r-y1); else x2 *= (0-y1);
    if (y2 > 0) y2 *= (0-x1); else y2 *= (r-x1);
    return((x2 >= y2)<<1);
}


//
// clipinsideboxline
//
int32_t clipinsideboxline(int32_t x, int32_t y, int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t walldist)
{
    const int32_t r = walldist<<1;

    x1 += walldist-x; x2 += walldist-x;
    if ((x1 < 0) && (x2 < 0)) return(0);
    if ((x1 >= r) && (x2 >= r)) return(0);

    y1 += walldist-y; y2 += walldist-y;
    if ((y1 < 0) && (y2 < 0)) return(0);
    if ((y1 >= r) && (y2 >= r)) return(0);

    x2 -= x1; y2 -= y1;
    if (x2*(walldist-y1) >= y2*(walldist-x1))  //Front
    {
        if (x2 > 0) x2 *= (0-y1); else x2 *= (r-y1);
        if (y2 > 0) y2 *= (r-x1); else y2 *= (0-x1);
        return(x2 < y2);
    }
    if (x2 > 0) x2 *= (r-y1); else x2 *= (0-y1);
    if (y2 > 0) y2 *= (0-x1); else y2 *= (r-x1);
    return((x2 >= y2)<<1);
}


//
// inside
//
// See http://fabiensanglard.net/duke3d/build_engine_internals.php,
// "Inside details" for the idea behind the algorithm.
int32_t inside(int32_t x, int32_t y, int16_t sectnum)
{
    if (sectnum >= 0 && sectnum < numsectors)
    {
        uint32_t cnt1 = 0, cnt2 = 0;
        walltype *wal = &wall[sector[sectnum].wallptr];
        int32_t i = sector[sectnum].wallnum;

        do
        {
            // Get the x and y components of the [tested point]-->[wall
            // point{1,2}] vectors.
            int32_t x1 = wal->x-x, x2 = wall[wal->point2].x-x;
            int32_t y1 = wal->y-y, y2 = wall[wal->point2].y-y;

            // First, test if the point is EXACTLY_ON_WALL_POINT.
            if ((x1|y1) == 0 || (x2|y2)==0)
                return 1;

            // If their signs differ[*], ...
            //
            // [*] where '-' corresponds to <0 and '+' corresponds to >=0.
            // Equivalently, the branch is taken iff
            //   y1 != y2 AND y_m <= y < y_M,
            // where y_m := min(y1, y2) and y_M := max(y1, y2).
            if ((y1^y2) < 0)
            {
                if ((x1^x2) >= 0)
                    cnt1 ^= x1;
                else
                    cnt1 ^= (x1*y2-x2*y1)^y2;
            }

            y1--;
            y2--;

            // Now, do the same comparisons, but with the interval half-open on
            // the other side! That is, take the branch iff
            //   y1 != y2 AND y_m < y <= y_M,
            // For a rectangular sector, without EXACTLY_ON_WALL_POINT, this
            // would still leave the lower left and upper right points
            // "outside" the sector.
            if ((y1^y2) < 0)
            {
                x1--;
                x2--;

                if ((x1^x2) >= 0)
                    cnt2 ^= x1;
                else
                    cnt2 ^= (x1*y2-x2*y1)^y2;
            }

            wal++; i--;
        }
        while (i);

        return (cnt1|cnt2)>>31;
    }

    return -1;
}

int32_t __fastcall getangle(int32_t xvect, int32_t yvect)
{
    int32_t rv;

    if ((xvect | yvect) == 0)
        rv = 0;
    else if (xvect == 0)
        rv = 512 + ((yvect < 0) << 10);
    else if (yvect == 0)
        rv = ((xvect < 0) << 10);
    else if (xvect == yvect)
        rv = 256 + ((xvect < 0) << 10);
    else if (xvect == -yvect)
        rv = 768 + ((xvect > 0) << 10);
    else if (klabs(xvect) > klabs(yvect))
        rv = ((radarang[640 + scale(160, yvect, xvect)] >> 6) + ((xvect < 0) << 10)) & 2047;
    else rv = ((radarang[640 - scale(160, xvect, yvect)] >> 6) + 512 + ((yvect < 0) << 10)) & 2047;

    return rv;
}

//
// ksqrt
//
int32_t ksqrt(uint32_t num)
{
    return nsqrtasm(num);
}

#ifdef LUNATIC
int32_t Mulscale(int32_t a, int32_t b, int32_t sh)
{
    return mulscale(a, b, sh);
}
#endif

// Gets the BUILD unit height and z offset of a sprite.
// Returns the z offset, 'height' may be NULL.
int32_t spriteheightofsptr(const spritetype *spr, int32_t *height, int32_t alsotileyofs)
{
    int32_t hei, zofs=0;
    const int32_t picnum=spr->picnum, yrepeat=spr->yrepeat;

    hei = (tilesiz[picnum].y*yrepeat)<<2;
    *height = hei;

    if (spr->cstat&128)
        zofs = hei>>1;

    // NOTE: a positive per-tile yoffset translates the sprite into the
    // negative world z direction (i.e. upward).
    if (alsotileyofs)
        zofs -= picanm[picnum].yofs*yrepeat<<2;

    return zofs;
}

//
// setsprite
//
int32_t setsprite(int16_t spritenum, const vec3_t *newpos)
{
    int16_t tempsectnum = sprite[spritenum].sectnum;

    if ((void const *)newpos != (void *)&sprite[spritenum])
        Bmemcpy(&sprite[spritenum], newpos, sizeof(vec3_t));

    updatesector(newpos->x,newpos->y,&tempsectnum);

    if (tempsectnum < 0)
        return(-1);
    if (tempsectnum != sprite[spritenum].sectnum)
        changespritesect(spritenum,tempsectnum);

    return(0);
}

int32_t setspritez(int16_t spritenum, const vec3_t *newpos)
{
    int16_t tempsectnum = sprite[spritenum].sectnum;

    if ((void const *)newpos != (void *)&sprite[spritenum])
        Bmemcpy(&sprite[spritenum], newpos, sizeof(vec3_t));

    updatesectorz(newpos->x,newpos->y,newpos->z,&tempsectnum);

    if (tempsectnum < 0)
        return(-1);
    if (tempsectnum != sprite[spritenum].sectnum)
        changespritesect(spritenum,tempsectnum);

    return(0);
}


//
// nextsectorneighborz
//
// -1: ceiling or up
//  1: floor or down
int32_t nextsectorneighborz(int16_t sectnum, int32_t refz, int16_t topbottom, int16_t direction)
{
    int32_t nextz = (direction==1) ? INT32_MAX : INT32_MIN;
    int32_t sectortouse = -1;

    const walltype *wal = &wall[sector[sectnum].wallptr];
    int32_t i = sector[sectnum].wallnum;

    do
    {
        const int32_t ns = wal->nextsector;

        if (ns >= 0)
        {
            const int32_t testz = (topbottom == 1) ?
                sector[ns].floorz : sector[ns].ceilingz;

            const int32_t update = (direction == 1) ?
                (nextz > testz && testz > refz) :
                (nextz < testz && testz < refz);

            if (update)
            {
                nextz = testz;
                sectortouse = ns;
            }
        }

        wal++;
        i--;
    }
    while (i != 0);

    return sectortouse;
}


//
// cansee
//
int32_t cansee(int32_t x1, int32_t y1, int32_t z1, int16_t sect1, int32_t x2, int32_t y2, int32_t z2, int16_t sect2)
{
    int32_t dacnt, danum;
    const int32_t x21 = x2-x1, y21 = y2-y1, z21 = z2-z1;

    static uint8_t sectbitmap[MAXSECTORS>>3];
#ifdef YAX_ENABLE
    int16_t pendingsectnum;
    vec3_t pendingvec;

    // Negative sectnums can happen, for example if the player is using noclip.
    // MAXSECTORS can happen from C-CON, e.g. canseespr with a sprite not in
    // the game world.
    if ((unsigned)sect1 >= MAXSECTORS || (unsigned)sect2 >= MAXSECTORS)
        return 0;

    Bmemset(&pendingvec, 0, sizeof(vec3_t));  // compiler-happy
#endif
    Bmemset(sectbitmap, 0, (numsectors+7)>>3);
#ifdef YAX_ENABLE
restart_grand:
#endif
    if (x1 == x2 && y1 == y2)
        return (sect1 == sect2);

#ifdef YAX_ENABLE
    pendingsectnum = -1;
#endif
    sectbitmap[sect1>>3] |= (1<<(sect1&7));
    clipsectorlist[0] = sect1; danum = 1;

    for (dacnt=0; dacnt<danum; dacnt++)
    {
        const int32_t dasectnum = clipsectorlist[dacnt];
        const sectortype *const sec = &sector[dasectnum];
        const walltype *wal;
        int32_t cnt;
#ifdef YAX_ENABLE
        int32_t cfz1[2], cfz2[2];  // both wrt dasectnum
        int16_t bn[2];

        yax_getbunches(dasectnum, &bn[0], &bn[1]);
        getzsofslope(dasectnum, x1,y1, &cfz1[0], &cfz1[1]);
        getzsofslope(dasectnum, x2,y2, &cfz2[0], &cfz2[1]);
#endif
        for (cnt=sec->wallnum,wal=&wall[sec->wallptr]; cnt>0; cnt--,wal++)
        {
            const twalltype *const wal2 = (twalltype *)&wall[wal->point2];
            const int32_t x31 = wal->x-x1, x34 = wal->x-wal2->x;
            const int32_t y31 = wal->y-y1, y34 = wal->y-wal2->y;

            int32_t x, y, z, nexts, t, bot;
            int32_t cfz[2];

            bot = y21*x34-x21*y34; if (bot <= 0) continue;
            // XXX: OVERFLOW
            t = y21*x31-x21*y31; if ((unsigned)t >= (unsigned)bot) continue;
            t = y31*x34-x31*y34;
            if ((unsigned)t >= (unsigned)bot)
            {
#ifdef YAX_ENABLE
                if (t >= bot)
                {
                    int32_t cf, frac, ns;
                    for (cf=0; cf<2; cf++)
                    {
                        if ((cf==0 && bn[0]>=0 && z1 > cfz1[0] && cfz2[0] > z2) ||
                            (cf==1 && bn[1]>=0 && z1 < cfz1[1] && cfz2[1] < z2))
                        {
                            if ((cfz1[cf]-cfz2[cf])-(z1-z2)==0)
                                continue;
                            frac = divscale24(z1-cfz1[cf], (z1-z2)-(cfz1[cf]-cfz2[cf]));

                            if ((unsigned)frac >= (1<<24))
                                continue;

                            x = x1 + mulscale24(x21,frac);
                            y = y1 + mulscale24(y21,frac);

                            ns = yax_getneighborsect(x, y, dasectnum, cf);
                            if (ns < 0)
                                continue;

                            if (!(sectbitmap[ns>>3] & (1<<(ns&7))) && pendingsectnum==-1)
                            {
                                sectbitmap[ns>>3] |= (1<<(ns&7));
                                pendingsectnum = ns;
                                pendingvec.x = x;
                                pendingvec.y = y;
                                pendingvec.z = z1 + mulscale24(z21,frac);
                            }
                        }
                    }
                }
#endif
                continue;
            }

            nexts = wal->nextsector;

#ifdef YAX_ENABLE
            if (bn[0]<0 && bn[1]<0)
#endif
                if (nexts < 0 || wal->cstat&32)
                    return 0;

            t = divscale24(t,bot);
            x = x1 + mulscale24(x21,t);
            y = y1 + mulscale24(y21,t);
            z = z1 + mulscale24(z21,t);

            getzsofslope(dasectnum, x,y, &cfz[0],&cfz[1]);

            if (z <= cfz[0] || z >= cfz[1])
            {
#ifdef YAX_ENABLE
                int32_t cf, frac;

                // XXX: Is this any good?
                for (cf=0; cf<2; cf++)
                    if ((cf==0 && bn[0]>=0 && z <= cfz[0] && z1 >= cfz1[0]) ||
                        (cf==1 && bn[1]>=0 && z >= cfz[1] && z1 <= cfz1[1]))
                    {
                        if ((cfz1[cf]-cfz[cf])-(z1-z)==0)
                            continue;

                        frac = divscale24(z1-cfz1[cf], (z1-z)-(cfz1[cf]-cfz[cf]));
                        t = mulscale24(t, frac);

                        if ((unsigned)t < (1<<24))
                        {
                            x = x1 + mulscale24(x21,t);
                            y = y1 + mulscale24(y21,t);

                            nexts = yax_getneighborsect(x, y, dasectnum, cf);
                            if (nexts >= 0)
                                goto add_nextsector;
                        }
                    }
                
#endif
                return 0;
            }

#ifdef YAX_ENABLE
            if (nexts < 0 || (wal->cstat&32))
                return 0;
#endif
            getzsofslope(nexts, x,y, &cfz[0],&cfz[1]);
            if (z <= cfz[0] || z >= cfz[1])
                return 0;

add_nextsector:
            if (!(sectbitmap[nexts>>3] & (1<<(nexts&7))))
            {
                sectbitmap[nexts>>3] |= (1<<(nexts&7));
                clipsectorlist[danum++] = nexts;
            }
        }

#ifdef YAX_ENABLE
        if (pendingsectnum>=0)
        {
            sect1 = pendingsectnum;
            x1 = pendingvec.x;
            y1 = pendingvec.y;
            z1 = pendingvec.z;
            goto restart_grand;
        }
#endif
    }

    if (sectbitmap[sect2>>3] & (1<<(sect2&7)))
        return 1;

    return 0;
}

static inline void hit_set(hitdata_t *hit, int32_t sectnum, int32_t wallnum, int32_t spritenum,
                           int32_t x, int32_t y, int32_t z)
{
    hit->sect = sectnum;
    hit->wall = wallnum;
    hit->sprite = spritenum;
    hit->pos.x = x;
    hit->pos.y = y;
    hit->pos.z = z;
}

static int32_t hitscan_hitsectcf=-1;

// stat, heinum, z: either ceiling- or floor-
// how: -1: behave like ceiling, 1: behave like floor
static int32_t hitscan_trysector(const vec3_t *sv, const sectortype *sec, hitdata_t *hit,
                                 int32_t vx, int32_t vy, int32_t vz,
                                 uint16_t stat, int16_t heinum, int32_t z, int32_t how, const intptr_t *tmp)
{
    int32_t x1 = INT32_MAX, y1, z1;
    int32_t i;

    if (stat&2)
    {
        const walltype *const wal = &wall[sec->wallptr];
        const walltype *const wal2 = &wall[wal->point2];
        int32_t j, dax=wal2->x-wal->x, day=wal2->y-wal->y;

        i = nsqrtasm(uhypsq(dax,day)); if (i == 0) return 1; //continue;
        i = divscale15(heinum,i);
        dax *= i; day *= i;

        j = (vz<<8)-dmulscale15(dax,vy,-day,vx);
        if (j != 0)
        {
            i = ((z - sv->z)<<8)+dmulscale15(dax,sv->y-wal->y,-day,sv->x-wal->x);
            if (((i^j) >= 0) && ((klabs(i)>>1) < klabs(j)))
            {
                i = divscale30(i,j);
                x1 = sv->x + mulscale30(vx,i);
                y1 = sv->y + mulscale30(vy,i);
                z1 = sv->z + mulscale30(vz,i);
            }
        }
    }
    else if ((how*vz > 0) && (how*sv->z <= how*z))
    {
        z1 = z; i = z1-sv->z;
        if ((klabs(i)>>1) < vz*how)
        {
            i = divscale30(i,vz);
            x1 = sv->x + mulscale30(vx,i);
            y1 = sv->y + mulscale30(vy,i);
        }
    }

    if ((x1 != INT32_MAX) && (klabs(x1-sv->x)+klabs(y1-sv->y) < klabs((hit->pos.x)-sv->x)+klabs((hit->pos.y)-sv->y)))
    {
        if (tmp==NULL)
        {
            if (inside(x1,y1,sec-sector) == 1)
            {
                hit_set(hit, sec-sector, -1, -1, x1, y1, z1);
                hitscan_hitsectcf = (how+1)>>1;
            }
        }
        else
        {
            const int32_t curidx=(int32_t)tmp[0];
            const spritetype *const curspr=(spritetype *)tmp[1];
            const int32_t thislastsec = tmp[2];

            if (!thislastsec)
            {
                if (inside(x1,y1,sec-sector) == 1)
                    hit_set(hit, curspr->sectnum, -1, curspr-sprite, x1, y1, z1);
            }
#ifdef HAVE_CLIPSHAPE_FEATURE
            else
            {
                for (i=clipinfo[curidx].qbeg; i<clipinfo[curidx].qend; i++)
                {
                    if (inside(x1,y1,sectq[i]) == 1)
                    {
                        hit_set(hit, curspr->sectnum, -1, curspr-sprite, x1, y1, z1);
                        break;
                    }
                }
            }
#endif
        }
    }

    return 0;
}

// x1, y1: in/out
// rest x/y: out
static void get_wallspr_points(const spritetype *spr, int32_t *x1, int32_t *x2,
                               int32_t *y1, int32_t *y2)
{
    //These lines get the 2 points of the rotated sprite
    //Given: (x1, y1) starts out as the center point

    const int32_t tilenum=spr->picnum, ang=spr->ang;
    const int32_t xrepeat = spr->xrepeat;
    int32_t xoff = picanm[tilenum].xofs + spr->xoffset;
    int32_t k, l, dax, day;

    if (spr->cstat&4)
        xoff = -xoff;

    dax = sintable[ang&2047]*xrepeat;
    day = sintable[(ang+1536)&2047]*xrepeat;

    l = tilesiz[tilenum].x;
    k = (l>>1)+xoff;

    *x1 -= mulscale16(dax,k);
    *x2 = *x1 + mulscale16(dax,l);

    *y1 -= mulscale16(day,k);
    *y2 = *y1 + mulscale16(day,l);
}

// x1, y1: in/out
// rest x/y: out
static void get_floorspr_points(const tspritetype *spr, int32_t px, int32_t py,
                                int32_t *x1, int32_t *x2, int32_t *x3, int32_t *x4,
                                int32_t *y1, int32_t *y2, int32_t *y3, int32_t *y4)
{
    const int32_t tilenum = spr->picnum;
    // &2047 in sinang:
    // DNE 1.3D lights camera action (1st level), spr->ang==2306
    // (probably from CON)
    const int32_t cosang = sintable[(spr->ang+512)&2047];
    const int32_t sinang = sintable[spr->ang&2047];

    const int32_t xspan=tilesiz[tilenum].x, xrepeat=spr->xrepeat;
    const int32_t yspan=tilesiz[tilenum].y, yrepeat=spr->yrepeat;

    int32_t xoff = picanm[tilenum].xofs + spr->xoffset;
    int32_t yoff = picanm[tilenum].yofs + spr->yoffset;
    int32_t k, l, dax, day;

    if (spr->cstat&4)
        xoff = -xoff;
    if (spr->cstat&8)
        yoff = -yoff;

    dax = ((xspan>>1)+xoff)*xrepeat;
    day = ((yspan>>1)+yoff)*yrepeat;

    *x1 += dmulscale16(sinang,dax, cosang,day) - px;
    *y1 += dmulscale16(sinang,day, -cosang,dax) - py;

    l = xspan*xrepeat;
    *x2 = *x1 - mulscale16(sinang,l);
    *y2 = *y1 + mulscale16(cosang,l);

    l = yspan*yrepeat;
    k = -mulscale16(cosang,l); *x3 = *x2+k; *x4 = *x1+k;
    k = -mulscale16(sinang,l); *y3 = *y2+k; *y4 = *y1+k;
}

static int32_t get_floorspr_clipyou(int32_t x1, int32_t x2, int32_t x3, int32_t x4,
                                   int32_t y1, int32_t y2, int32_t y3, int32_t y4)
{
    int32_t clipyou = 0;

    if ((y1^y2) < 0)
    {
        if ((x1^x2) < 0) clipyou ^= (x1*y2 < x2*y1)^(y1<y2);
        else if (x1 >= 0) clipyou ^= 1;
    }
    if ((y2^y3) < 0)
    {
        if ((x2^x3) < 0) clipyou ^= (x2*y3 < x3*y2)^(y2<y3);
        else if (x2 >= 0) clipyou ^= 1;
    }
    if ((y3^y4) < 0)
    {
        if ((x3^x4) < 0) clipyou ^= (x3*y4 < x4*y3)^(y3<y4);
        else if (x3 >= 0) clipyou ^= 1;
    }
    if ((y4^y1) < 0)
    {
        if ((x4^x1) < 0) clipyou ^= (x4*y1 < x1*y4)^(y4<y1);
        else if (x4 >= 0) clipyou ^= 1;
    }

    return clipyou;
}

// intp: point of currently best (closest) intersection
static int32_t try_facespr_intersect(const spritetype *spr, const vec3_t *refpos,
                                     int32_t vx, int32_t vy, int32_t vz,
                                     vec3_t *intp, int32_t strictly_smaller_than_p)
{
    const int32_t x1=spr->x, y1=spr->y;
    const int32_t xs=refpos->x, ys=refpos->y;

    const int32_t topt = vx*(x1-xs) + vy*(y1-ys);
    if (topt > 0)
    {
        const int32_t bot = vx*vx + vy*vy;
        if (bot != 0)
        {
            int32_t i;
            const int32_t intz = refpos->z + scale(vz,topt,bot);
            const int32_t z1 = spr->z + spriteheightofsptr(spr, &i, 1);

            if (intz >= z1-i && intz <= z1)
            {
                const int32_t topu = vx*(y1-ys) - vy*(x1-xs);

                const int32_t offx = scale(vx,topu,bot);
                const int32_t offy = scale(vy,topu,bot);
                const int32_t dist = offx*offx + offy*offy;

                i = tilesiz[spr->picnum].x*spr->xrepeat;
                if (dist <= mulscale7(i,i))
                {
                    const int32_t intx = xs + scale(vx,topt,bot);
                    const int32_t inty = ys + scale(vy,topt,bot);

                    if (klabs(intx-xs)+klabs(inty-ys) + strictly_smaller_than_p
                            <= klabs(intp->x-xs)+klabs(intp->y-ys))
                    {
                        intp->x = intx;
                        intp->y = inty;
                        intp->z = intz;
                        return 1;
                    }
                }
            }
        }
    }

    return 0;
}

//
// hitscan
//
#ifdef HAVE_CLIPSHAPE_FEATURE
static int32_t clipsprite_initindex(int32_t curidx, spritetype *curspr, int32_t *clipsectcnt, const vec3_t *vect);
#endif

int32_t hitscan(const vec3_t *sv, int16_t sectnum, int32_t vx, int32_t vy, int32_t vz,
                hitdata_t *hit, uint32_t cliptype)
{
    int32_t x1, y1=0, z1=0, x2, y2, intx, inty, intz;
    int32_t i, k, daz;
    int16_t tempshortcnt, tempshortnum;

    spritetype *curspr = NULL;
    int32_t clipspritecnt, curidx=-1;
    // tmp: { (int32_t)curidx, (spritetype *)curspr, (!=0 if outer sector) }
    intptr_t tmp[3], *tmpptr=NULL;
#ifdef YAX_ENABLE
    vec3_t newsv;
    int32_t oldhitsect = -1, oldhitsect2 = -2;
#endif
    const int32_t dawalclipmask = (cliptype&65535);
    const int32_t dasprclipmask = (cliptype>>16);

    hit->sect = -1; hit->wall = -1; hit->sprite = -1;
    if (sectnum < 0)
        return -1;

#ifdef YAX_ENABLE
restart_grand:
#endif
    hit->pos.x = hitscangoalx; hit->pos.y = hitscangoaly;

    clipsectorlist[0] = sectnum;
    tempshortcnt = 0; tempshortnum = 1;
    clipspritecnt = clipspritenum = 0;
    do
    {
        const sectortype *sec;
        const walltype *wal;
        int32_t dasector, z, startwall, endwall;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (tempshortcnt >= tempshortnum)
        {
            // one bunch of sectors completed, prepare the next
            if (!curspr)
                mapinfo_set(&origmapinfo, &clipmapinfo);  // replace sector and wall with clip map

            curspr = &sprite[clipspritelist[clipspritecnt]];
            curidx = clipshape_idx_for_sprite(curspr, curidx);

            if (curidx < 0)
            {
                clipspritecnt++;
                continue;
            }

            tmp[0] = (intptr_t)curidx;
            tmp[1] = (intptr_t)curspr;
            tmpptr = tmp;

            clipsprite_initindex(curidx, curspr, &i, sv);  // &i is dummy
            tempshortnum = (int16_t)clipsectnum;
            tempshortcnt = 0;
        }
#endif
        dasector = clipsectorlist[tempshortcnt]; sec = &sector[dasector];

        i = 1;
#ifdef HAVE_CLIPSHAPE_FEATURE
        if (curspr)
        {
            if (dasector == sectq[clipinfo[curidx].qend])
            {
                i = -1;
                tmp[2] = 1;
            }
            else tmp[2] = 0;
        }
#endif
        if (hitscan_trysector(sv, sec, hit, vx,vy,vz, sec->ceilingstat, sec->ceilingheinum, sec->ceilingz, -i, tmpptr))
            continue;
        if (hitscan_trysector(sv, sec, hit, vx,vy,vz, sec->floorstat, sec->floorheinum, sec->floorz, i, tmpptr))
            continue;

        ////////// Walls //////////

        startwall = sec->wallptr; endwall = startwall + sec->wallnum;
        for (z=startwall,wal=&wall[startwall]; z<endwall; z++,wal++)
        {
            const int32_t nextsector = wal->nextsector;
            const walltype *const wal2 = &wall[wal->point2];
            int32_t daz2, zz;

            if (curspr && nextsector<0) continue;

            x1 = wal->x; y1 = wal->y; x2 = wal2->x; y2 = wal2->y;

            if ((coord_t)(x1-sv->x)*(y2-sv->y) < (coord_t)(x2-sv->x)*(y1-sv->y)) continue;
            if (rintersect(sv->x,sv->y,sv->z, vx,vy,vz, x1,y1, x2,y2, &intx,&inty,&intz) == -1) continue;

            if (klabs(intx-sv->x)+klabs(inty-sv->y) >= klabs((hit->pos.x)-sv->x)+klabs((hit->pos.y)-sv->y))
                continue;

            if (!curspr)
            {
                if ((nextsector < 0) || (wal->cstat&dawalclipmask))
                {
                    hit_set(hit, dasector, z, -1, intx, inty, intz);
                    continue;
                }

                getzsofslope(nextsector,intx,inty,&daz,&daz2);
                if (intz <= daz || intz >= daz2)
                {
                    hit_set(hit, dasector, z, -1, intx, inty, intz);
                    continue;
                }
            }
#ifdef HAVE_CLIPSHAPE_FEATURE
            else
            {
                int32_t cz,fz;

                if (wal->cstat&dawalclipmask)
                {
                    hit_set(hit, curspr->sectnum, -1, curspr-sprite, intx, inty, intz);
                    continue;
                }

                getzsofslope(nextsector,intx,inty,&daz,&daz2);
                getzsofslope(sectq[clipinfo[curidx].qend],intx,inty,&cz,&fz);
                // ceil   cz daz daz2 fz   floor
                if ((cz <= intz && intz <= daz) || (daz2 <= intz && intz <= fz))
                {
                    hit_set(hit, curspr->sectnum, -1, curspr-sprite, intx, inty, intz);
                    continue;
                }
            }
#endif
            for (zz=tempshortnum-1; zz>=0; zz--)
                if (clipsectorlist[zz] == nextsector) break;
            if (zz < 0) clipsectorlist[tempshortnum++] = nextsector;
        }

        ////////// Sprites //////////

        if (dasprclipmask==0)
            continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (curspr)
            continue;
#endif
        for (z=headspritesect[dasector]; z>=0; z=nextspritesect[z])
        {
            const spritetype *const spr = &sprite[z];
            const int32_t cstat = spr->cstat;
#ifdef USE_OPENGL
            if (!hitallsprites)
#endif
                if ((cstat&dasprclipmask) == 0)
                    continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
            // try and see whether this sprite's picnum has sector-like clipping data
            i = pictoidx[spr->picnum];
            // handle sector-like floor sprites separately
            while (i>=0 && (spr->cstat&32) != (clipmapinfo.sector[sectq[clipinfo[i].qbeg]].CM_CSTAT&32))
                i = clipinfo[i].next;
            if (i>=0 && clipspritenum<MAXCLIPNUM)
            {
                clipspritelist[clipspritenum++] = z;
                continue;
            }
#endif
            x1 = spr->x; y1 = spr->y; z1 = spr->z;
            switch (cstat&48)
            {
            case 0:
            {
                if (try_facespr_intersect(spr, sv, vx, vy, vz, &hit->pos, 0))
                {
                    hit->sect = dasector;
                    hit->wall = -1;
                    hit->sprite = z;
                }

                break;
            }

            case 16:
            {
                int32_t ucoefup16;
                int32_t tilenum = spr->picnum;

                get_wallspr_points(spr, &x1, &x2, &y1, &y2);

                if ((cstat&64) != 0)   //back side of 1-way sprite
                    if ((coord_t)(x1-sv->x)*(y2-sv->y) < (coord_t)(x2-sv->x)*(y1-sv->y)) continue;

                ucoefup16 = rintersect(sv->x,sv->y,sv->z,vx,vy,vz,x1,y1,x2,y2,&intx,&inty,&intz);
                if (ucoefup16 == -1) continue;

                if (klabs(intx-sv->x)+klabs(inty-sv->y) > klabs((hit->pos.x)-sv->x)+klabs((hit->pos.y)-sv->y))
                    continue;

                daz = spr->z + spriteheightofs(z, &k, 1);
                if (intz > daz-k && intz < daz)
                {
                    if (picanm[tilenum].sf&PICANM_TEXHITSCAN_BIT)
                    {
                        DO_TILE_ANIM(tilenum, 0);

                        if (!waloff[tilenum])
                            loadtile(tilenum);

                        if (waloff[tilenum])
                        {
                            // daz-intz > 0 && daz-intz < k
                            int32_t xtex = mulscale16(ucoefup16, tilesiz[tilenum].x);
                            int32_t vcoefup16 = 65536-divscale16(daz-intz, k);
                            int32_t ytex = mulscale16(vcoefup16, tilesiz[tilenum].y);

                            const char *texel = (char *)(waloff[tilenum] + tilesiz[tilenum].y*xtex + ytex);
                            if (*texel == 255)
                                continue;
                        }
                    }

                    hit_set(hit, dasector, -1, z, intx, inty, intz);
                }
                break;
            }

            case 32:
            {
                int32_t x3, y3, x4, y4, zz;

                if (vz == 0) continue;
                intz = z1;
                if (((intz-sv->z)^vz) < 0) continue;
                if ((cstat&64) != 0)
                    if ((sv->z > intz) == ((cstat&8)==0)) continue;
#if 1
                // Abyss crash prevention code ((intz-sv->z)*zx overflowing a 8-bit word)
                // PK: the reason for the crash is not the overflowing (even if it IS a problem;
                // signed overflow is undefined behavior in C), but rather the idiv trap when
                // the resulting quotient doesn't fit into a *signed* 32-bit integer.
                zz = (uint32_t)(intz-sv->z) * vx;
                intx = sv->x+scale(zz,1,vz);
                zz = (uint32_t)(intz-sv->z) * vy;
                inty = sv->y+scale(zz,1,vz);
#else
                intx = sv->x+scale(intz-sv->z,vx,vz);
                inty = sv->y+scale(intz-sv->z,vy,vz);
#endif
                if (klabs(intx-sv->x)+klabs(inty-sv->y) > klabs((hit->pos.x)-sv->x)+klabs((hit->pos.y)-sv->y))
                    continue;

                get_floorspr_points((tspritetype const *)spr, intx, inty, &x1, &x2, &x3, &x4,
                                    &y1, &y2, &y3, &y4);

                if (get_floorspr_clipyou(x1, x2, x3, x4, y1, y2, y3, y4))
                {
                    hit_set(hit, dasector, -1, z, intx, inty, intz);
                }

                break;
            }
            }
        }
    }
    while (++tempshortcnt < tempshortnum || clipspritecnt < clipspritenum);

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (curspr)
        mapinfo_set(NULL, &origmapinfo);
#endif

#ifdef YAX_ENABLE
    if (numyaxbunches == 0 || editstatus)
        return 0;

    if (hit->sprite==-1 && hit->wall==-1 && hit->sect!=oldhitsect
        && hit->sect != oldhitsect2)  // 'ping-pong' infloop protection
    {
        if (hit->sect == -1 && oldhitsect >= 0)
        {
            // this is bad: we didn't hit anything after going through a ceiling/floor
            Bmemcpy(&hit->pos, &newsv, sizeof(vec3_t));
            hit->sect = oldhitsect;

            return 0;
        }

        // 1st, 2nd, ... ceil/floor hit
        // hit->sect is >=0 because if oldhitsect's init and check above
        if (SECTORFLD(hit->sect,stat, hitscan_hitsectcf)&yax_waltosecmask(dawalclipmask))
            return 0;

        i = yax_getneighborsect(hit->pos.x, hit->pos.y, hit->sect, hitscan_hitsectcf);
        if (i >= 0)
        {
            Bmemcpy(&newsv, &hit->pos, sizeof(vec3_t));
            sectnum = i;
            sv = &newsv;

            oldhitsect2 = oldhitsect;
            oldhitsect = hit->sect;
            hit->sect = -1;

            // sector-like sprite re-init:
            curspr = 0;
            curidx = -1;
            tmpptr = NULL;

            goto restart_grand;
        }
    }
#endif

    return(0);
}


//
// neartag
//
void neartag(int32_t xs, int32_t ys, int32_t zs, int16_t sectnum, int16_t ange,
             int16_t *neartagsector, int16_t *neartagwall, int16_t *neartagsprite, int32_t *neartaghitdist,  /* out */
             int32_t neartagrange, uint8_t tagsearch,
             int32_t (*blacklist_sprite_func)(int32_t))
{
    int16_t tempshortcnt, tempshortnum;

    const int32_t vx = mulscale14(sintable[(ange+2560)&2047],neartagrange);
    const int32_t vy = mulscale14(sintable[(ange+2048)&2047],neartagrange);
    vec3_t hitv = { xs+vx, ys+vy, 0 };
    const vec3_t sv = { xs, ys, zs };

    *neartagsector = -1; *neartagwall = -1; *neartagsprite = -1;
    *neartaghitdist = 0;

    if (sectnum < 0 || (tagsearch & 3) == 0)
        return;

    clipsectorlist[0] = sectnum;
    tempshortcnt = 0; tempshortnum = 1;

    do
    {
        const int32_t dasector = clipsectorlist[tempshortcnt];

        const int32_t startwall = sector[dasector].wallptr;
        const int32_t endwall = startwall + sector[dasector].wallnum - 1;
        const walltype *wal;
        int32_t z;

        for (z=startwall,wal=&wall[startwall]; z<=endwall; z++,wal++)
        {
            const walltype *const wal2 = &wall[wal->point2];
            const int32_t nextsector = wal->nextsector;

            const int32_t x1=wal->x, y1=wal->y, x2=wal2->x, y2=wal2->y;
            int32_t intx, inty, intz, good = 0;

            if (nextsector >= 0)
            {
                if ((tagsearch&1) && sector[nextsector].lotag) good |= 1;
                if ((tagsearch&2) && sector[nextsector].hitag) good |= 1;
            }

            if ((tagsearch&1) && wal->lotag) good |= 2;
            if ((tagsearch&2) && wal->hitag) good |= 2;

            if ((good == 0) && (nextsector < 0)) continue;
            if ((coord_t)(x1-xs)*(y2-ys) < (coord_t)(x2-xs)*(y1-ys)) continue;

            if (lintersect(xs,ys,zs,hitv.x,hitv.y,hitv.z,x1,y1,x2,y2,&intx,&inty,&intz) == 1)
            {
                if (good != 0)
                {
                    if (good&1) *neartagsector = nextsector;
                    if (good&2) *neartagwall = z;
                    *neartaghitdist = dmulscale14(intx-xs,sintable[(ange+2560)&2047],inty-ys,sintable[(ange+2048)&2047]);
                    hitv.x = intx; hitv.y = inty; hitv.z = intz;
                }

                if (nextsector >= 0)
                {
                    int32_t zz;
                    for (zz=tempshortnum-1; zz>=0; zz--)
                        if (clipsectorlist[zz] == nextsector) break;
                    if (zz < 0) clipsectorlist[tempshortnum++] = nextsector;
                }
            }
        }

        tempshortcnt++;

        if (tagsearch & 4)
            continue; // skip sprite search

        for (z=headspritesect[dasector]; z>=0; z=nextspritesect[z])
        {
            const spritetype *const spr = &sprite[z];

            if (blacklist_sprite_func && blacklist_sprite_func(z))
                continue;

            if (((tagsearch&1) && spr->lotag) || ((tagsearch&2) && spr->hitag))
            {
                if (try_facespr_intersect(spr, &sv, vx, vy, 0, &hitv, 1))
                {
                    *neartagsprite = z;
                    *neartaghitdist = dmulscale14(hitv.x-xs, sintable[(ange+2560)&2047],
                                                  hitv.y-ys, sintable[(ange+2048)&2047]);
                }
            }
        }
    }
    while (tempshortcnt < tempshortnum);

    return;
}


//
// dragpoint
//
// flags:
//  1: don't reset walbitmap[] (the bitmap of already dragged vertices)
//  2: In the editor, do wall[].cstat |= (1<<14) also for the lastwall().
void dragpoint(int16_t pointhighlight, int32_t dax, int32_t day, uint8_t flags)
#ifdef YAX_ENABLE
{
    int32_t i, numyaxwalls=0;
    static int16_t yaxwalls[MAXWALLS];

    uint8_t *const walbitmap = (uint8_t *)tempbuf;

    if ((flags&1)==0)
        Bmemset(walbitmap, 0, (numwalls+7)>>3);
    yaxwalls[numyaxwalls++] = pointhighlight;

    for (i=0; i<numyaxwalls; i++)
    {
        int32_t clockwise = 0;
        int32_t w = yaxwalls[i];
        const int32_t tmpstartwall = w;

        int32_t cnt = MAXWALLS;

        while (1)
        {
            int32_t j, tmpcf;

            wall[w].x = dax;
            wall[w].y = day;
            walbitmap[w>>3] |= (1<<(w&7));

            for (YAX_ITER_WALLS(w, j, tmpcf))
            {
                if ((walbitmap[j>>3]&(1<<(j&7)))==0)
                {
                    walbitmap[j>>3] |= (1<<(j&7));
                    yaxwalls[numyaxwalls++] = j;
                }
            }

            if (!clockwise)  //search points CCW
            {
                if (wall[w].nextwall >= 0)
                    w = wall[wall[w].nextwall].point2;
                else
                {
                    w = tmpstartwall;
                    clockwise = 1;
                }
            }

            cnt--;
            if (cnt==0)
            {
                initprintf("dragpoint %d: infloop!\n", pointhighlight);
                i = numyaxwalls;
                break;
            }

            if (clockwise)
            {
                int32_t thelastwall = lastwall(w);
                if (wall[thelastwall].nextwall >= 0)
                    w = wall[thelastwall].nextwall;
                else
                    break;
            }

            if ((walbitmap[w>>3] & (1<<(w&7))))
            {
                if (clockwise)
                    break;

                w = tmpstartwall;
                clockwise = 1;
                continue;
            }
        }
    }

    if (editstatus)
    {
        int32_t w;
        // TODO: extern a separate bitmap instead?
        for (w=0; w<numwalls; w++)
            if (walbitmap[w>>3] & (1<<(w&7)))
            {
                wall[w].cstat |= (1<<14);
                if (flags&2)
                    wall[lastwall(w)].cstat |= (1<<14);
            }
    }
}
#else
{
    int16_t cnt, tempshort;
    int32_t thelastwall;

    tempshort = pointhighlight;    //search points CCW
    cnt = MAXWALLS;

    wall[tempshort].x = dax;
    wall[tempshort].y = day;

    if (editstatus)
    {
        wall[pointhighlight].cstat |= (1<<14);
        if (linehighlight >= 0 && linehighlight < MAXWALLS)
            wall[linehighlight].cstat |= (1<<14);
        wall[lastwall(pointhighlight)].cstat |= (1<<14);
    }

    do
    {
        if (wall[tempshort].nextwall >= 0)
        {
            tempshort = wall[wall[tempshort].nextwall].point2;

            wall[tempshort].x = dax;
            wall[tempshort].y = day;
            wall[tempshort].cstat |= (1<<14);
        }
        else
        {
            tempshort = pointhighlight;    //search points CW if not searched all the way around
            do
            {
                thelastwall = lastwall(tempshort);
                if (wall[thelastwall].nextwall >= 0)
                {
                    tempshort = wall[thelastwall].nextwall;
                    wall[tempshort].x = dax;
                    wall[tempshort].y = day;
                    wall[tempshort].cstat |= (1<<14);
                }
                else
                {
                    break;
                }
                cnt--;
            }
            while ((tempshort != pointhighlight) && (cnt > 0));
            break;
        }
        cnt--;
    }
    while ((tempshort != pointhighlight) && (cnt > 0));
}
#endif

//
// lastwall
//
int32_t lastwall(int16_t point)
{
    if (point > 0 && wall[point-1].point2 == point)
        return point-1;

    int i = point, cnt = MAXWALLS;
    do
    {
        int const j = wall[i].point2;

        if (j == point)
        {
            point = i;
            break;
        }

        i = j;
    }
    while (--cnt);

    return point;
}


////////// CLIPMOVE //////////

int32_t clipmoveboxtracenum = 3;

#ifdef HAVE_CLIPSHAPE_FEATURE
static int32_t clipsprite_try(const spritetype *spr, int32_t xmin, int32_t ymin, int32_t xmax, int32_t ymax)
{
    // try and see whether this sprite's picnum has sector-like clipping data
    int32_t i = pictoidx[spr->picnum];
    // handle sector-like floor sprites separately
    while (i>=0 && (spr->cstat&32) != (clipmapinfo.sector[sectq[clipinfo[i].qbeg]].CM_CSTAT&32))
        i = clipinfo[i].next;

    if (i>=0)
    {
        int32_t maxcorrection = clipinfo[i].maxdist;
        const int32_t k = sectq[clipinfo[i].qbeg];

        if ((spr->cstat&48)!=32)  // face/wall sprite
        {
            int32_t tempint1 = clipmapinfo.sector[k].CM_XREPEAT;
            maxcorrection = divideu32_noinline(maxcorrection * (int32_t)spr->xrepeat, tempint1);
        }
        else  // floor sprite
        {
            int32_t tempint1 = clipmapinfo.sector[k].CM_XREPEAT;
            int32_t tempint2 = clipmapinfo.sector[k].CM_YREPEAT;
            maxcorrection = max(divideu32_noinline(maxcorrection * (int32_t)spr->xrepeat, tempint1),
                                divideu32_noinline(maxcorrection * (int32_t)spr->yrepeat, tempint2));
        }

        maxcorrection -= MAXCLIPDIST;

        if (spr->x < xmin - maxcorrection) return 1;
        if (spr->y < ymin - maxcorrection) return 1;
        if (spr->x > xmax + maxcorrection) return 1;
        if (spr->y > ymax + maxcorrection) return 1;

        if (clipspritenum < MAXCLIPNUM)
            clipspritelist[clipspritenum++] = spr-sprite;
//initprintf("%d: clip sprite[%d]\n",clipspritenum,j);
        return 1;
    }

    return 0;
}

// return: -1 if curspr has x-flip xor y-flip (in the horizontal map plane!), 1 else
static int32_t clipsprite_initindex(int32_t curidx, spritetype *curspr, int32_t *clipsectcnt, const vec3_t *vect)
{
    int32_t k, daz = curspr->z;
    int32_t scalex, scaley, scalez, flipx, flipy;
    int32_t flipmul=1;

    const int32_t j = sectq[clipinfo[curidx].qbeg];
    const int32_t tempint1 = sector[j].CM_XREPEAT;
    const int32_t tempint2 = sector[j].CM_YREPEAT;

    const int32_t rotang = (curspr->ang - sector[j].CM_ANG)&2047;
    const int32_t dorot = !CM_NOROTS(j);

    if ((curspr->cstat&48)!=32)  // face/wall sprite
    {
        scalex = scaley = divscale22(curspr->xrepeat, tempint1);
        scalez = divscale22(curspr->yrepeat, tempint2);

        flipx = 1-((curspr->cstat&4)>>1);
        flipy = 1;
    }
    else
    {
        scalex = divscale22(curspr->xrepeat, tempint1);
        scaley = divscale22(curspr->yrepeat, tempint2);
        scalez = scalex;

        flipx = 1-((curspr->cstat&4)>>1);
        flipy = 1-((curspr->cstat&8)>>2);
    }

    if (dorot)
    {
        flipmul = flipx*flipy;
        if (flipmul==-1)
            wall = (walltype *)loadwallinv;
    }

    if ((curspr->cstat&128) != (sector[j].CM_CSTAT&128))
        daz += (((curspr->cstat&128)>>6)-1)*((tilesiz[curspr->picnum].y*curspr->yrepeat)<<1);

    *clipsectcnt = clipsectnum = 0;
    // init sectors for this index
    for (k=clipinfo[curidx].qbeg; k<=clipinfo[curidx].qend; k++)
    {
        const int32_t j = sectq[k];
        sectortype *const sec = &sector[j];
        const int32_t startwall = sec->wallptr, endwall = startwall+sec->wallnum;

        int32_t w;
        walltype *wal;

        sec->floorz = daz + mulscale22(scalez, CM_FLOORZ(j));
        sec->ceilingz = daz + mulscale22(scalez, CM_CEILINGZ(j));
//initprintf("sec %d: f=%d, c=%d\n", j, sec->floorz, sec->ceilingz);

        for (w=startwall,wal=&wall[startwall]; w<endwall; w++,wal++)
        {
            wal->x = mulscale22(scalex, CM_WALL_X(w));
            wal->y = mulscale22(scaley, CM_WALL_Y(w));

            if (dorot)
            {
                wal->x *= flipx;
                wal->y *= flipy;
                rotatepoint(zerovec, *(vec2_t *)wal, rotang, (vec2_t *)wal);
            }

            wal->x += curspr->x;
            wal->y += curspr->y;
        }

        if (inside(vect->x, vect->y, j)==1)
            clipsectorlist[clipsectnum++] = j;
    }

    // add outer sector if not inside inner ones
    if (clipsectnum==0)
        clipsectorlist[clipsectnum++] = sectq[k-1];

    return flipmul;
}
#endif

static int32_t clipmove_warned=0;

static void addclipline(int32_t dax1, int32_t day1, int32_t dax2, int32_t day2, int32_t daoval)
{
    if (clipnum < MAXCLIPNUM)
    {
        clipit[clipnum].x1 = dax1; clipit[clipnum].y1 = day1;
        clipit[clipnum].x2 = dax2; clipit[clipnum].y2 = day2;
        clipobjectval[clipnum] = daoval;
        clipnum++;
    }
    else if (!clipmove_warned)
    {
        initprintf("!!clipnum\n");
        clipmove_warned = 1;
    }
}

static inline void clipmove_tweak_pos(const vec3_t *pos, int32_t gx, int32_t gy,
                                      int32_t x1, int32_t y1, int32_t x2, int32_t y2,
                                      int32_t *daxptr, int32_t *dayptr)
{
    int32_t daz;

    if (rintersect(pos->x,pos->y,0, gx,gy,0, x1,y1, x2,y2, daxptr,dayptr,&daz) == -1)
    {
        *daxptr = pos->x;
        *dayptr = pos->y;
    }
}

// Returns: should clip?
static int32_t check_floor_curb(int32_t dasect, int32_t nextsect, int32_t flordist,
                                int32_t posz, int32_t dax, int32_t day)
{
    const sectortype *sec2 = &sector[nextsect];
    int32_t daz2 = getflorzofslope(nextsect, dax,day);

    return ((sec2->floorstat&1) == 0 &&  // parallaxed floor curbs don't clip
                posz >= daz2-(flordist-1) &&  // also account for desired z distance tolerance
                daz2 < getflorzofslope(dasect, dax,day)-(1<<8));  // curbs less tall than 256 z units don't clip
}

int32_t clipmovex(vec3_t *pos, int16_t *sectnum,
                  int32_t xvect, int32_t yvect,
                  int32_t walldist, int32_t ceildist, int32_t flordist, uint32_t cliptype,
                  uint8_t noslidep)
{
    const int32_t oboxtracenum = clipmoveboxtracenum;

    if (noslidep)
        clipmoveboxtracenum = 1;
    int32_t ret = clipmove(pos, sectnum, xvect, yvect,
                           walldist, ceildist, flordist, cliptype);
    clipmoveboxtracenum = oboxtracenum;

    return ret;
}

//
// clipmove
//
int32_t clipmove(vec3_t *pos, int16_t *sectnum,
                 int32_t xvect, int32_t yvect,
                 int32_t walldist, int32_t ceildist, int32_t flordist, uint32_t cliptype)
{
    int32_t i, j, k, tempint1, tempint2;
    int32_t x1, y1, x2, y2;
    int32_t dax, day;
    int32_t retval=0;

    spritetype *curspr=NULL;  // non-NULL when handling sprite with sector-like clipping
    int32_t curidx=-1, clipsectcnt, clipspritecnt;

    const int32_t dawalclipmask = (cliptype&65535);        //CLIPMASK0 = 0x00010001
    const int32_t dasprclipmask = (cliptype>>16);          //CLIPMASK1 = 0x01000040

    const int32_t oxvect=xvect, oyvect=yvect;

    int32_t goalx = pos->x + (xvect>>14);
    int32_t goaly = pos->y + (yvect>>14);
    const int32_t cx = (pos->x+goalx)>>1;
    const int32_t cy = (pos->y+goaly)>>1;

    //Extra walldist for sprites on sector lines
    const int32_t gx=goalx-(pos->x), gy=goaly-(pos->y);
    const int32_t rad = nsqrtasm(uhypsq(gx,gy)) + MAXCLIPDIST+walldist + 8;
    const int32_t xmin = cx-rad, ymin = cy-rad;
    const int32_t xmax = cx+rad, ymax = cy+rad;

    if ((xvect|yvect) == 0 || *sectnum < 0)
        return 0;

    clipmove_warned = 0;
    clipnum = 0;

    clipsectorlist[0] = (*sectnum);
    clipsectcnt = 0; clipsectnum = 1;
    clipspritecnt = 0; clipspritenum = 0;
    do
    {
        const walltype *wal;
        const sectortype *sec;
        int32_t dasect, startwall, endwall;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (clipsectcnt>=clipsectnum)
        {
            // one bunch of sectors completed (either the very first
            // one or a sector-like sprite one), prepare the next

//initprintf("init sprite %d\n", clipspritecnt);
            if (!curspr)
            {
                // init sector-like sprites for clipping
                origclipsectnum = clipsectnum;
                Bmemcpy(origclipsectorlist, clipsectorlist, clipsectnum*sizeof(clipsectorlist[0]));

                // replace sector and wall with clip map
                mapinfo_set(&origmapinfo, &clipmapinfo);
            }

            curspr = &sprite[clipspritelist[clipspritecnt]];
            curidx = clipshape_idx_for_sprite(curspr, curidx);

            if (curidx < 0)
            {
                clipspritecnt++;
                continue;
            }

            clipsprite_initindex(curidx, curspr, &clipsectcnt, pos);
        }
#endif

        dasect = clipsectorlist[clipsectcnt++];
//if (curspr)
//    initprintf("sprite %d/%d: sect %d/%d (%d)\n", clipspritecnt,clipspritenum, clipsectcnt,clipsectnum,dasect);

        ////////// Walls //////////

        sec = &sector[dasect];
        startwall = sec->wallptr; endwall = startwall + sec->wallnum;
        for (j=startwall,wal=&wall[startwall]; j<endwall; j++,wal++)
        {
            int32_t clipyou = 0, dx, dy;
            const walltype *const wal2 = &wall[wal->point2];

            if (wal->x < xmin && wal2->x < xmin) continue;
            if (wal->x > xmax && wal2->x > xmax) continue;
            if (wal->y < ymin && wal2->y < ymin) continue;
            if (wal->y > ymax && wal2->y > ymax) continue;

            x1 = wal->x; y1 = wal->y; x2 = wal2->x; y2 = wal2->y;

            dx = x2-x1; dy = y2-y1;
            if (dx*((pos->y)-y1) < ((pos->x)-x1)*dy) continue;  //If wall's not facing you

            if (dx > 0) dax = dx*(ymin-y1); else dax = dx*(ymax-y1);
            if (dy > 0) day = dy*(xmax-x1); else day = dy*(xmin-x1);
            if (dax >= day) continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
            if (curspr)
            {
                if (wal->nextsector>=0)
                {
                    const sectortype *sec2 = &sector[wal->nextsector];

                    clipmove_tweak_pos(pos, gx,gy, x1,y1, x2,y2, &dax,&day);

                    #define CLIPMV_SPR_F_DAZ2 getflorzofslope(wal->nextsector, dax,day)
                    #define CLIPMV_SPR_F_BASEZ getflorzofslope(sectq[clipinfo[curidx].qend], dax,day)

                    if ((sec2->floorstat&1) == 0)
                        if (CLIPMV_SPR_F_DAZ2-(flordist-1) <= pos->z)
                            if (pos->z <= CLIPMV_SPR_F_BASEZ+(flordist-1))
                                clipyou = 1;

                    if (clipyou == 0)
                    {
                        #define CLIPMV_SPR_C_DAZ2 getceilzofslope(wal->nextsector, dax,day)
                        #define CLIPMV_SPR_C_BASEZ getceilzofslope(sectq[clipinfo[curidx].qend], dax,day)

                        if ((sec2->ceilingstat&1) == 0)
                            if (CLIPMV_SPR_C_BASEZ-(ceildist-1) <= pos->z)
                                if (pos->z <= CLIPMV_SPR_C_DAZ2+(ceildist-1))
                                    clipyou = 1;
                    }
                }
            }
            else
#endif
            if (wal->nextsector < 0 || (wal->cstat&dawalclipmask))
            {
                clipyou = 1;
#ifdef YAX_ENABLE
                int16_t cb = yax_getbunch(dasect, YAX_CEILING);

                if (cb >= 0 && (sec->ceilingstat & yax_waltosecmask(dawalclipmask)) == 0)
                {
                    int32_t ynw = yax_getnextwall(j, YAX_CEILING);

                    if (ynw >= 0 && wall[ynw].nextsector >= 0 && (wall[ynw].cstat & dawalclipmask) == 0)
                    {
                        clipmove_tweak_pos(pos, gx,gy, x1,y1, x2,y2, &dax,&day);
                        clipyou = check_floor_curb(dasect, wall[ynw].nextsector, flordist, pos->z, dax, day);
                    }
                }
#endif
            }
            else if (editstatus == 0)
            {
                clipmove_tweak_pos(pos, gx,gy, x1,y1, x2,y2, &dax,&day);
                clipyou = check_floor_curb(dasect, wal->nextsector, flordist, pos->z, dax, day);

                if (clipyou == 0)
                {
                    const sectortype *sec2 = &sector[wal->nextsector];
                    int32_t daz2 = getceilzofslope(wal->nextsector, dax,day);

                    clipyou = ((sec2->ceilingstat&1) == 0 &&
                                   pos->z <= daz2+(ceildist-1) &&
                                   daz2 > getceilzofslope(dasect, dax,day)+(1<<8));
                }
            }

            if (clipyou)
            {
                int16_t objtype;
                int32_t bsz;

                if (!curspr)
                    objtype = (int16_t)j+32768;
                else
                    objtype = (int16_t)(curspr-sprite)+49152;

                //Add 2 boxes at endpoints
                bsz = walldist; if (gx < 0) bsz = -bsz;
                addclipline(x1-bsz,y1-bsz, x1-bsz,y1+bsz, objtype);
                addclipline(x2-bsz,y2-bsz, x2-bsz,y2+bsz, objtype);
                bsz = walldist; if (gy < 0) bsz = -bsz;
                addclipline(x1+bsz,y1-bsz, x1-bsz,y1-bsz, objtype);
                addclipline(x2+bsz,y2-bsz, x2-bsz,y2-bsz, objtype);

                dax = walldist; if (dy > 0) dax = -dax;
                day = walldist; if (dx < 0) day = -day;
                addclipline(x1+dax,y1+day, x2+dax,y2+day, objtype);
            }
            else if (wal->nextsector>=0)
            {
                for (i=clipsectnum-1; i>=0; i--)
                    if (wal->nextsector == clipsectorlist[i]) break;
                if (i < 0) clipsectorlist[clipsectnum++] = wal->nextsector;
            }
        }

        ////////// Sprites //////////

        if (dasprclipmask==0)
            continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (curspr)
            continue;  // next sector of this index
#endif
        for (j=headspritesect[dasect]; j>=0; j=nextspritesect[j])
        {
            const spritetype *const spr = &sprite[j];
            const int32_t cstat = spr->cstat;

            if ((cstat&dasprclipmask) == 0)
                continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
            if (clipsprite_try(spr, xmin,ymin, xmax,ymax))
                continue;
#endif
            x1 = spr->x; y1 = spr->y;

            switch (cstat&48)
            {
            case 0:
                if (x1 >= xmin && x1 <= xmax && y1 >= ymin && y1 <= ymax)
                {
                    const int32_t daz = spr->z + spriteheightofs(j, &k, 1);

                    if (pos->z > daz-k-flordist && pos->z < daz+ceildist)
                    {
                        int32_t bsz;
                        bsz = (spr->clipdist<<2)+walldist; if (gx < 0) bsz = -bsz;
                        addclipline(x1-bsz,y1-bsz,x1-bsz,y1+bsz,(int16_t)j+49152);
                        bsz = (spr->clipdist<<2)+walldist; if (gy < 0) bsz = -bsz;
                        addclipline(x1+bsz,y1-bsz,x1-bsz,y1-bsz,(int16_t)j+49152);
                    }
                }
                break;

            case 16:
            {
                const int32_t daz = spr->z + spriteheightofs(j, &k, 1);

                if (pos->z > daz-k-flordist && pos->z < daz+ceildist)
                {
                    get_wallspr_points(spr, &x1, &x2, &y1, &y2);

                    if (clipinsideboxline(cx,cy,x1,y1,x2,y2,rad) != 0)
                    {
                        dax = mulscale14(sintable[(spr->ang+256+512)&2047],walldist);
                        day = mulscale14(sintable[(spr->ang+256)&2047],walldist);

                        if ((x1-(pos->x))*(y2-(pos->y)) >= (x2-(pos->x))*(y1-(pos->y)))   //Front
                        {
                            addclipline(x1+dax,y1+day,x2+day,y2-dax,(int16_t)j+49152);
                        }
                        else
                        {
                            if ((cstat&64) != 0) continue;
                            addclipline(x2-dax,y2-day,x1-day,y1+dax,(int16_t)j+49152);
                        }

                        //Side blocker
                        if ((x2-x1)*((pos->x)-x1) + (y2-y1)*((pos->y)-y1) < 0)
                            addclipline(x1-day,y1+dax,x1+dax,y1+day,(int16_t)j+49152); 
                        else if ((x1-x2)*((pos->x)-x2) + (y1-y2)*((pos->y)-y2) < 0)
                            addclipline(x2+day,y2-dax,x2-dax,y2-day,(int16_t)j+49152);
                    }
                }
                break;
            }

            case 32:
            {
                if (pos->z > spr->z - flordist && pos->z < spr->z + ceildist)
                {
                    if ((cstat&64) != 0)
                        if ((pos->z > spr->z) == ((cstat&8)==0))
                            continue;

                    rxi[0] = x1;
                    ryi[0] = y1;
                    get_floorspr_points((tspritetype const *) spr, 0, 0, &rxi[0], &rxi[1], &rxi[2], &rxi[3],
                                        &ryi[0], &ryi[1], &ryi[2], &ryi[3]);

                    dax = mulscale14(sintable[(spr->ang-256+512)&2047],walldist);
                    day = mulscale14(sintable[(spr->ang-256)&2047],walldist);

                    if ((rxi[0]-(pos->x))*(ryi[1]-(pos->y)) < (rxi[1]-(pos->x))*(ryi[0]-(pos->y)))
                    {
                        if (clipinsideboxline(cx,cy,rxi[1],ryi[1],rxi[0],ryi[0],rad) != 0)
                            addclipline(rxi[1]-day,ryi[1]+dax,rxi[0]+dax,ryi[0]+day,(int16_t)j+49152);
                    }
                    else if ((rxi[2]-(pos->x))*(ryi[3]-(pos->y)) < (rxi[3]-(pos->x))*(ryi[2]-(pos->y)))
                    {
                        if (clipinsideboxline(cx,cy,rxi[3],ryi[3],rxi[2],ryi[2],rad) != 0)
                            addclipline(rxi[3]+day,ryi[3]-dax,rxi[2]-dax,ryi[2]-day,(int16_t)j+49152);
                    }

                    if ((rxi[1]-(pos->x))*(ryi[2]-(pos->y)) < (rxi[2]-(pos->x))*(ryi[1]-(pos->y)))
                    {
                        if (clipinsideboxline(cx,cy,rxi[2],ryi[2],rxi[1],ryi[1],rad) != 0)
                            addclipline(rxi[2]-dax,ryi[2]-day,rxi[1]-day,ryi[1]+dax,(int16_t)j+49152);
                    }
                    else if ((rxi[3]-(pos->x))*(ryi[0]-(pos->y)) < (rxi[0]-(pos->x))*(ryi[3]-(pos->y)))
                    {
                        if (clipinsideboxline(cx,cy,rxi[0],ryi[0],rxi[3],ryi[3],rad) != 0)
                            addclipline(rxi[0]+dax,ryi[0]+day,rxi[3]+day,ryi[3]-dax,(int16_t)j+49152);
                    }
                }
                break;
            }
            }
        }
    }
    while (clipsectcnt < clipsectnum || clipspritecnt < clipspritenum);

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (curspr)
    {
        // restore original map
        mapinfo_set(NULL, &origmapinfo);

        clipsectnum = origclipsectnum;
        Bmemcpy(clipsectorlist, origclipsectorlist, clipsectnum*sizeof(clipsectorlist[0]));
    }
#endif

    int32_t hitwalls[4], hitwall;
    int32_t cnt = clipmoveboxtracenum;

    do
    {
        int32_t intx=goalx, inty=goaly;

        hitwall = raytrace(pos->x, pos->y, &intx, &inty);
        if (hitwall >= 0)
        {
            const int32_t lx = clipit[hitwall].x2-clipit[hitwall].x1;
            const int32_t ly = clipit[hitwall].y2-clipit[hitwall].y1;
            const uint64_t tempull = (int64_t)lx*(int64_t)lx + (int64_t)ly*(int64_t)ly;

            if (tempull > 0 && tempull < INT32_MAX)
            {
                tempint2 = (int32_t)tempull;

                tempint1 = (goalx-intx)*lx + (goaly-inty)*ly;

                if ((klabs(tempint1)>>11) < tempint2)
                    i = divscale20(tempint1,tempint2);
                else
                    i = 0;
                goalx = mulscale20(lx,i)+intx;
                goaly = mulscale20(ly,i)+inty;
            }

            tempint1 = dmulscale6(lx,oxvect,ly,oyvect);
            for (i=cnt+1; i<=clipmoveboxtracenum; i++)
            {
                j = hitwalls[i];
                tempint2 = dmulscale6(clipit[j].x2-clipit[j].x1, oxvect,
                                      clipit[j].y2-clipit[j].y1, oyvect);
                if ((tempint1^tempint2) < 0)
                {
                    updatesector(pos->x,pos->y,sectnum);
                    return retval;
                }
            }

            keepaway(&goalx, &goaly, hitwall);
            xvect = (goalx-intx)<<14;
            yvect = (goaly-inty)<<14;

            if (cnt == clipmoveboxtracenum)
                retval = (uint16_t)clipobjectval[hitwall];
            hitwalls[cnt] = hitwall;
        }
        cnt--;

        pos->x = intx;
        pos->y = inty;
    }
    while ((xvect|yvect) != 0 && hitwall >= 0 && cnt > 0);

    for (j=0; j<clipsectnum; j++)
        if (inside(pos->x,pos->y,clipsectorlist[j]) == 1)
        {
            *sectnum = clipsectorlist[j];
            return retval;
        }

    *sectnum = -1; tempint1 = INT32_MAX;
    for (j=numsectors-1; j>=0; j--)
        if (inside(pos->x,pos->y,j) == 1)
        {
            if (sector[j].ceilingstat&2)
                tempint2 = getceilzofslope(j, pos->x, pos->y) - pos->z;
            else
                tempint2 = sector[j].ceilingz - pos->z;

            if (tempint2 > 0)
            {
                if (tempint2 < tempint1)
                    { *sectnum = j; tempint1 = tempint2; }
            }
            else
            {
                if (sector[j].floorstat&2)
                    tempint2 = pos->z - getflorzofslope(j, pos->x, pos->y);
                else
                    tempint2 = pos->z - sector[j].floorz;

                if (tempint2 <= 0)
                {
                    *sectnum = j;
                    return retval;
                }
                if (tempint2 < tempint1)
                    { *sectnum = j; tempint1 = tempint2; }
            }
        }

    return retval;
}


//
// pushmove
//
int32_t pushmove(vec3_t *vect, int16_t *sectnum,
                 int32_t walldist, int32_t ceildist, int32_t flordist, uint32_t cliptype)
{
    int32_t i, j, k, t, dx, dy, dax, day, daz;
    int32_t dir, bad, bad2;

    const int32_t dawalclipmask = (cliptype&65535);
//    const int32_t dasprclipmask = (cliptype>>16);

    if (*sectnum < 0)
        return -1;

    k = 32;
    dir = 1;
    do
    {
        int32_t clipsectcnt;

        bad = 0;

        clipsectorlist[0] = *sectnum;
        clipsectcnt = 0; clipsectnum = 1;
        do
        {
            const walltype *wal;
            const sectortype *sec;
            int32_t startwall, endwall;
#if 0
            // Push FACE sprites
            for(i=headspritesect[clipsectorlist[clipsectcnt]];i>=0;i=nextspritesect[i])
            {
                spr = &sprite[i];
                if (((spr->cstat&48) != 0) && ((spr->cstat&48) != 48)) continue;
                if ((spr->cstat&dasprclipmask) == 0) continue;

                dax = (vect->x)-spr->x; day = (vect->y)-spr->y;
                t = (spr->clipdist<<2)+walldist;
                if ((klabs(dax) < t) && (klabs(day) < t))
                {
                    daz = spr->z + spriteheightofs(i, &t, 1);
                    if (((vect->z) < daz+ceildist) && ((vect->z) > daz-t-flordist))
                    {
                        t = (spr->clipdist<<2)+walldist;

                        j = getangle(dax,day);
                        dx = (sintable[(j+512)&2047]>>11);
                        dy = (sintable[(j)&2047]>>11);
                        bad2 = 16;
                        do
                        {
                            vect->x = (vect->x) + dx; vect->y = (vect->y) + dy;
                            bad2--; if (bad2 == 0) break;
                        } while ((klabs((vect->x)-spr->x) < t) && (klabs((vect->y)-spr->y) < t));
                        bad = -1;
                        k--; if (k <= 0) return(bad);
                        updatesector(vect->x,vect->y,sectnum);
                    }
                }
            }
#endif
            sec = &sector[clipsectorlist[clipsectcnt]];
            if (dir > 0)
                startwall = sec->wallptr, endwall = startwall + sec->wallnum;
            else
                endwall = sec->wallptr, startwall = endwall + sec->wallnum;

            for (i=startwall,wal=&wall[startwall]; i!=endwall; i+=dir,wal+=dir)
                if (clipinsidebox(vect->x,vect->y,i,walldist-4) == 1)
                {
                    j = 0;
                    if (wal->nextsector < 0) j = 1;
                    if (wal->cstat&dawalclipmask) j = 1;
                    if (j == 0)
                    {
                        const sectortype *const sec2 = &sector[wal->nextsector];
                        int32_t daz2;

                        //Find closest point on wall (dax, day) to (vect->x, vect->y)
                        dax = wall[wal->point2].x-wal->x;
                        day = wall[wal->point2].y-wal->y;
                        daz = dax*((vect->x)-wal->x) + day*((vect->y)-wal->y);
                        if (daz <= 0)
                            t = 0;
                        else
                        {
                            daz2 = dax*dax+day*day;
                            if (daz >= daz2) t = (1<<30); else t = divscale30(daz,daz2);
                        }
                        dax = wal->x + mulscale30(dax,t);
                        day = wal->y + mulscale30(day,t);


                        daz = getflorzofslope(clipsectorlist[clipsectcnt],dax,day);
                        daz2 = getflorzofslope(wal->nextsector,dax,day);
                        if ((daz2 < daz-(1<<8)) && ((sec2->floorstat&1) == 0))
                            if (vect->z >= daz2-(flordist-1)) j = 1;

                        daz = getceilzofslope(clipsectorlist[clipsectcnt],dax,day);
                        daz2 = getceilzofslope(wal->nextsector,dax,day);
                        if ((daz2 > daz+(1<<8)) && ((sec2->ceilingstat&1) == 0))
                            if (vect->z <= daz2+(ceildist-1)) j = 1;
                    }

                    if (j != 0)
                    {
                        j = getangle(wall[wal->point2].x-wal->x,wall[wal->point2].y-wal->y);
                        dx = (sintable[(j+1024)&2047]>>11);
                        dy = (sintable[(j+512)&2047]>>11);
                        bad2 = 16;
                        do
                        {
                            vect->x = (vect->x) + dx; vect->y = (vect->y) + dy;
                            bad2--; if (bad2 == 0) break;
                        }
                        while (clipinsidebox(vect->x,vect->y,i,walldist-4) != 0);
                        bad = -1;
                        k--; if (k <= 0) return(bad);
                        updatesector(vect->x,vect->y,sectnum);
                        if (*sectnum < 0) return -1;
                    }
                    else
                    {
                        for (j=clipsectnum-1; j>=0; j--)
                            if (wal->nextsector == clipsectorlist[j]) break;
                        if (j < 0) clipsectorlist[clipsectnum++] = wal->nextsector;
                    }
                }

            clipsectcnt++;
        }
        while (clipsectcnt < clipsectnum);
        dir = -dir;
    }
    while (bad != 0);

    return(bad);
}


// breadth-first search helpers
void bfirst_search_init(int16_t *list, uint8_t *bitmap, int32_t *eltnumptr, int32_t maxnum, int16_t firstelt)
{
    Bmemset(bitmap, 0, (maxnum+7)>>3);

    list[0] = firstelt;
    bitmap[firstelt>>3] |= (1<<(firstelt&7));
    *eltnumptr = 1;
}

void bfirst_search_try(int16_t *list, uint8_t *bitmap, int32_t *eltnumptr, int16_t elt)
{
    if (elt < 0)
        return;

    if ((bitmap[elt>>3]&(1<<(elt&7)))==0)
    {
        bitmap[elt>>3] |= (1<<(elt&7));
        list[*eltnumptr] = elt;
        (*eltnumptr)++;
    }
}

////////// UPDATESECTOR* FAMILY OF FUNCTIONS //////////

/* Different "is inside" predicates.
 * NOTE: The redundant bound checks are expected to be optimized away in the
 * inlined code. */
static inline int32_t inside_p(int32_t x, int32_t y, int16_t sectnum)
{
    return (sectnum>=0 && inside(x, y, sectnum) == 1);
}

static inline int32_t inside_exclude_p(int32_t x, int32_t y, int16_t i, const uint8_t *excludesectbitmap)
{
    return (i>=0 && !(excludesectbitmap[i>>3]&(1<<(i&7))) && inside_p(x, y, i));
}

/* NOTE: no bound check */
static inline int32_t inside_z_p(int32_t x, int32_t y, int32_t z, int16_t i)
{
    int32_t cz, fz;
    getzsofslope(i, x, y, &cz, &fz);
    return (z >= cz && z <= fz && inside_p(x, y, i));
}

#define SET_AND_RETURN(Lval, Rval) do \
{ \
    (Lval) = (Rval); \
    return; \
} while (0)


//
// updatesector[z]
//
void updatesector(int32_t x, int32_t y, int16_t *sectnum)
{
    int32_t i;

    if (inside_p(x,y,*sectnum))
        return;

    if ((unsigned)*sectnum < (unsigned)numsectors)
    {
        const walltype *wal = &wall[sector[*sectnum].wallptr];
        int32_t j = sector[*sectnum].wallnum;

        do
        {
            i = wal->nextsector;
            if (inside_p(x, y, i))
                SET_AND_RETURN(*sectnum, i);

            wal++; j--;
        }
        while (j != 0);
    }

    for (i=numsectors-1; i>=0; i--)
        if (inside_p(x, y, i))
            SET_AND_RETURN(*sectnum, i);

    *sectnum = -1;
}

void updatesectorbreadth(int32_t x, int32_t y, int16_t *sectnum)
{
    static int16_t sectlist[MAXSECTORS];
    static uint8_t sectbitmap[MAXSECTORS>>3];
    int32_t nsecs, sectcnt, j;

    if ((unsigned)(*sectnum) >= (unsigned)numsectors)
        return;

    bfirst_search_init(sectlist, sectbitmap, &nsecs, numsectors, *sectnum);

    for (sectcnt=0; sectcnt<nsecs; sectcnt++)
    {
        if (inside_p(x,y, sectlist[sectcnt]))
            SET_AND_RETURN(*sectnum, sectlist[sectcnt]);

        {
            const sectortype *sec = &sector[sectlist[sectcnt]];
            int32_t startwall = sec->wallptr;
            int32_t endwall = sec->wallptr + sec->wallnum;

            for (j=startwall; j<endwall; j++)
                if (wall[j].nextsector >= 0)
                    bfirst_search_try(sectlist, sectbitmap, &nsecs, wall[j].nextsector);
        }
    }

    *sectnum = -1;
}

void updatesectorexclude(int32_t x, int32_t y, int16_t *sectnum, const uint8_t *excludesectbitmap)
{
    int32_t i;

    if (inside_exclude_p(x, y, *sectnum, excludesectbitmap))
        return;

    if (*sectnum >= 0 && *sectnum < numsectors)
    {
        const walltype *wal = &wall[sector[*sectnum].wallptr];
        int32_t j = sector[*sectnum].wallnum;

        do
        {
            i = wal->nextsector;
            if (inside_exclude_p(x, y, i, excludesectbitmap))
                SET_AND_RETURN(*sectnum, i);

            wal++; j--;
        }
        while (j != 0);
    }

    for (i=numsectors-1; i>=0; i--)
        if (inside_exclude_p(x, y, i, excludesectbitmap))
            SET_AND_RETURN(*sectnum, i);

    *sectnum = -1;
}

// new: if *sectnum >= MAXSECTORS, *sectnum-=MAXSECTORS is considered instead
//      as starting sector and the 'initial' z check is skipped
//      (not initial anymore because it follows the sector updating due to TROR)
void updatesectorz(int32_t x, int32_t y, int32_t z, int16_t *sectnum)
{
    int32_t i;

    if ((uint32_t)(*sectnum) < 2*MAXSECTORS)
    {
        const walltype *wal;
        int32_t j, cz, fz;

        int32_t nofirstzcheck = 0;

        if (*sectnum >= MAXSECTORS)
        {
            *sectnum -= MAXSECTORS;
            nofirstzcheck = 1;
        }

        // this block used to be outside the "if" and caused crashes in Polymost Mapster32
        getzsofslope(*sectnum, x, y, &cz, &fz);

#ifdef YAX_ENABLE
        if (z < cz)
        {
            i = yax_getneighborsect(x, y, *sectnum, YAX_CEILING);
            if (i >= 0 && z >= getceilzofslope(i, x, y))
                SET_AND_RETURN(*sectnum, i);
        }

        if (z > fz)
        {
            i = yax_getneighborsect(x, y, *sectnum, YAX_FLOOR);
            if (i >= 0 && z <= getflorzofslope(i, x, y))
                SET_AND_RETURN(*sectnum, i);
        }
#endif
        if (nofirstzcheck || (z >= cz && z <= fz))
            if (inside_p(x, y, *sectnum))
                return;

        wal = &wall[sector[*sectnum].wallptr];
        j = sector[*sectnum].wallnum;
        do
        {
            // YAX: TODO: check neighboring sectors here too?
            i = wal->nextsector;
            if (i>=0 && inside_z_p(x,y,z, i))
                SET_AND_RETURN(*sectnum, i);

            wal++; j--;
        }
        while (j != 0);
    }

    for (i=numsectors-1; i>=0; i--)
        if (inside_z_p(x,y,z, i))
            SET_AND_RETURN(*sectnum, i);

    *sectnum = -1;
}


//
// rotatepoint
//
void rotatepoint(vec2_t const pivot, vec2_t p, int16_t daang, vec2_t *p2)
{
    int const dacos = sintable[(daang+2560)&2047];
    int const dasin = sintable[(daang+2048)&2047];
    p.x -= pivot.x;
    p.y -= pivot.y;
    p2->x = dmulscale14(p.x, dacos, -p.y, dasin) + pivot.x;
    p2->y = dmulscale14(p.y, dacos, p.x, dasin) + pivot.y;
}


//
// getmousevalues
//

void getmousevalues(int32_t *mousx, int32_t *mousy, int32_t *bstatus)
{
    readmousexy(mousx,mousy);
    readmousebstatus(bstatus);
}


#if KRANDDEBUG
# include <execinfo.h>
# define KRD_MAXCALLS 262144
# define KRD_DEPTH 8
static int32_t krd_numcalls=0;
static void *krd_fromwhere[KRD_MAXCALLS][KRD_DEPTH];
static int32_t krd_enabled=0;

void krd_enable(int which)  // 0: disable, 1: rec, 2: play
{
    krd_enabled = which;

    if (which)
        Bmemset(krd_fromwhere, 0, sizeof(krd_fromwhere));
}

int32_t krd_print(const char *filename)
{
    FILE *fp;
    int32_t i, j;

    if (!krd_enabled) return 1;
    krd_enabled = 0;

    fp = fopen(filename, "wb");
    if (!fp) { OSD_Printf("krd_print (2): fopen"); return 1; }

    for (i=0; i<krd_numcalls; i++)
    {
        for (j=1;; j++)  // skip self entry
        {
            if (j>=KRD_DEPTH || krd_fromwhere[i][j]==NULL)
            {
                fprintf(fp, "\n");
                break;
            }
            fprintf(fp, " [%p]", krd_fromwhere[i][j]);
        }
    }

    krd_numcalls = 0;

    fclose(fp);
    return 0;
}
#endif  // KRANDDEBUG

#if KRANDDEBUG || defined LUNATIC
//
// krand
//
int32_t krand(void)
{
//    randomseed = (randomseed*27584621)+1;
    randomseed = (randomseed * 1664525ul) + 221297ul;
#ifdef KRANDDEBUG
    if (krd_enabled)
        if (krd_numcalls < KRD_MAXCALLS)
        {
            backtrace(krd_fromwhere[krd_numcalls], KRD_DEPTH);
            krd_numcalls++;
        }
#endif
    return ((uint32_t)randomseed)>>16;
}
#endif

//
// getzrange
//
void getzrange(const vec3_t *pos, int16_t sectnum,
               int32_t *ceilz, int32_t *ceilhit, int32_t *florz, int32_t *florhit,
               int32_t walldist, uint32_t cliptype)
{
    int32_t clipsectcnt;
    int32_t daz, daz2, i, j, x1, y1, x2, y2;

#ifdef YAX_ENABLE
    // YAX round, -1:center, 0:ceiling, 1:floor
    int32_t mcf=-1;
#endif

    spritetype *curspr=NULL;  // non-NULL when handling sprite with sector-like clipping
    int32_t curidx=-1, clipspritecnt;

    //Extra walldist for sprites on sector lines
    const int32_t extradist = walldist+MAXCLIPDIST+1;
    const int32_t xmin = pos->x-extradist, ymin = pos->y-extradist;
    const int32_t xmax = pos->x+extradist, ymax = pos->y+extradist;

    const int32_t dawalclipmask = (cliptype&65535);
    const int32_t dasprclipmask = (cliptype>>16);

    if (sectnum < 0)
    {
        *ceilz = INT32_MIN; *ceilhit = -1;
        *florz = INT32_MAX; *florhit = -1;
        return;
    }

    getzsofslope(sectnum,pos->x,pos->y,ceilz,florz);
    *ceilhit = sectnum+16384; *florhit = sectnum+16384;

#ifdef YAX_ENABLE
    origclipsectorlist[0] = sectnum;
    origclipsectnum = 1;
#endif
    clipsectorlist[0] = sectnum;
    clipsectcnt = 0; clipsectnum = 1;
    clipspritecnt = clipspritenum = 0;

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (0)
    {
beginagain:
        // replace sector and wall with clip map
        mapinfo_set(&origmapinfo, &clipmapinfo);
        clipsectcnt = clipsectnum;  // should be a nop, "safety"...
    }
#endif

#ifdef YAX_ENABLE
restart_grand:
#endif
    do  //Collect sectors inside your square first
    {
#ifdef HAVE_CLIPSHAPE_FEATURE
        if (clipsectcnt>=clipsectnum)
        {
            // one set of clip-sprite sectors completed, prepare the next

            curspr = &sprite[clipspritelist[clipspritecnt]];
            curidx = clipshape_idx_for_sprite(curspr, curidx);

            if (curidx < 0)
            {
                // didn't find matching clipping sectors for sprite
                clipspritecnt++;
                continue;
            }

            clipsprite_initindex(curidx, curspr, &clipsectcnt, pos);

            for (i=0; i<clipsectnum; i++)
            {
                const int k = clipsectorlist[i];

                if (k==sectq[clipinfo[curidx].qend])
                    continue;

                int32_t fz, cz;
                getzsofslope(k,pos->x,pos->y,&daz,&daz2);
                getzsofslope(sectq[clipinfo[curidx].qend],pos->x,pos->y,&cz,&fz);
                const int hitwhat = (curspr-sprite)+49152;

                if ((sector[k].ceilingstat&1)==0)
                {
                    if (pos->z < cz && cz < *florz) { *florz = cz; *florhit = hitwhat; }
                    if (pos->z > daz && daz > *ceilz) { *ceilz = daz; *ceilhit = hitwhat; }
                }
                if ((sector[k].floorstat&1)==0)
                {
                    if (pos->z < daz2 && daz2 < *florz) { *florz = daz2; *florhit = hitwhat; }
                    if (pos->z > fz && fz > *ceilz) { *ceilz = fz; *ceilhit = hitwhat; }
                }
            }
        }
#endif
        ////////// Walls //////////

        const walltype *wal;
        const sectortype *const startsec = &sector[clipsectorlist[clipsectcnt]];
        const int startwall = startsec->wallptr;
        const int endwall = startwall + startsec->wallnum;

        for (j=startwall,wal=&wall[startwall]; j<endwall; j++,wal++)
        {
            const int k = wal->nextsector;

            if (k >= 0)
            {
                const walltype *const wal2 = &wall[wal->point2];

                x1 = wal->x; x2 = wal2->x;
                if ((x1 < xmin) && (x2 < xmin)) continue;
                if ((x1 > xmax) && (x2 > xmax)) continue;
                y1 = wal->y; y2 = wal2->y;
                if ((y1 < ymin) && (y2 < ymin)) continue;
                if ((y1 > ymax) && (y2 > ymax)) continue;

                const int32_t dx = x2-x1, dy = y2-y1;
                if (dx*(pos->y-y1) < (pos->x-x1)*dy) continue; //back

                int32_t dax = (dx > 0) ? dx*(ymin-y1) : dx*(ymax-y1);
                int32_t day = (dy > 0) ? dy*(xmax-x1) : dy*(xmin-x1);
                if (dax >= day)
                    continue;

                if (wal->cstat&dawalclipmask) continue;  // XXX?
                const sectortype *const sec = &sector[k];

#ifdef HAVE_CLIPSHAPE_FEATURE
                if (curspr)
                {
                    if (k==sectq[clipinfo[curidx].qend])
                        continue;
                    if ((sec->ceilingstat&1) && (sec->floorstat&1))
                        continue;
                }
                else
#endif
                if (editstatus == 0)
                {
                    if (((sec->ceilingstat&1) == 0) && (pos->z <= sec->ceilingz+(3<<8))) continue;
                    if (((sec->floorstat&1) == 0) && (pos->z >= sec->floorz-(3<<8))) continue;
                }

                for (i=clipsectnum-1; i>=0; i--)
                    if (clipsectorlist[i] == k) break;
                if (i < 0) clipsectorlist[clipsectnum++] = k;

                if ((x1 < xmin+MAXCLIPDIST) && (x2 < xmin+MAXCLIPDIST)) continue;
                if ((x1 > xmax-MAXCLIPDIST) && (x2 > xmax-MAXCLIPDIST)) continue;
                if ((y1 < ymin+MAXCLIPDIST) && (y2 < ymin+MAXCLIPDIST)) continue;
                if ((y1 > ymax-MAXCLIPDIST) && (y2 > ymax-MAXCLIPDIST)) continue;

                if (dx > 0) dax += dx*MAXCLIPDIST; else dax -= dx*MAXCLIPDIST;
                if (dy > 0) day -= dy*MAXCLIPDIST; else day += dy*MAXCLIPDIST;
                if (dax >= day)
                    continue;
#ifdef YAX_ENABLE
                if (mcf==-1 && curspr==NULL)
                    origclipsectorlist[origclipsectnum++] = k;
#endif
                //It actually got here, through all the continue's!!!
                getzsofslope(k, pos->x,pos->y, &daz,&daz2);

#ifdef HAVE_CLIPSHAPE_FEATURE
                if (curspr)
                {
                    int32_t fz,cz, hitwhat=(curspr-sprite)+49152;
                    getzsofslope(sectq[clipinfo[curidx].qend],pos->x,pos->y,&cz,&fz);

                    if ((sec->ceilingstat&1)==0)
                    {
                        if (pos->z < cz && cz < *florz) { *florz = cz; *florhit = hitwhat; }
                        if (pos->z > daz && daz > *ceilz) { *ceilz = daz; *ceilhit = hitwhat; }
                    }
                    if ((sec->floorstat&1)==0)
                    {
                        if (pos->z < daz2 && daz2 < *florz) { *florz = daz2; *florhit = hitwhat; }
                        if (pos->z > fz && fz > *ceilz) { *ceilz = fz; *ceilhit = hitwhat; }
                    }
                }
                else
#endif
                {
#ifdef YAX_ENABLE
                    int16_t cb, fb;
                    yax_getbunches(k, &cb, &fb);
#endif
                    if (daz > *ceilz)
#ifdef YAX_ENABLE
                        if (mcf!=YAX_FLOOR && cb < 0)
#endif
                        *ceilz = daz, *ceilhit = k+16384; 

                    if (daz2 < *florz)
#ifdef YAX_ENABLE
                        if (mcf!=YAX_CEILING && fb < 0)
#endif
                        *florz = daz2, *florhit = k+16384; 
                }
            }
        }
        clipsectcnt++;
    }
    while (clipsectcnt < clipsectnum || clipspritecnt < clipspritenum);

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (curspr)
    {
        mapinfo_set(NULL, &origmapinfo);  // restore original map
        clipsectnum = clipspritenum = 0;  // skip the next for loop and check afterwards
    }
#endif

    ////////// Sprites //////////

    for (i=0; i<clipsectnum; i++)
    {
        if (dasprclipmask==0)
            break;

        for (j=headspritesect[clipsectorlist[i]]; j>=0; j=nextspritesect[j])
        {
            const spritetype *const spr = &sprite[j];
            const int32_t cstat = spr->cstat;

            if (cstat&dasprclipmask)
            {
                int32_t clipyou = 0;

#ifdef HAVE_CLIPSHAPE_FEATURE
                if (clipsprite_try(spr, xmin,ymin, xmax,ymax))
                    continue;
#endif
                x1 = spr->x; y1 = spr->y;

                switch (cstat&48)
                {
                case 0:
                {
                    int32_t k = walldist+(spr->clipdist<<2)+1;
                    if ((klabs(x1-pos->x) <= k) && (klabs(y1-pos->y) <= k))
                    {
                        daz = spr->z + spriteheightofs(j, &k, 1);
                        daz2 = daz - k;
                        clipyou = 1;
                    }
                    break;
                }

                case 16:
                {
                    get_wallspr_points(spr, &x1, &x2, &y1, &y2);

                    if (clipinsideboxline(pos->x,pos->y,x1,y1,x2,y2,walldist+1) != 0)
                    {
                        int32_t k;
                        daz = spr->z + spriteheightofs(j, &k, 1);
                        daz2 = daz-k;
                        clipyou = 1;
                    }
                    break;
                }

                case 32:
                {
                    int32_t x3, y3, x4, y4;

                    daz = spr->z; daz2 = daz;

                    if ((cstat&64) != 0)
                        if ((pos->z > daz) == ((cstat&8)==0))
                            continue;

                    get_floorspr_points((tspritetype const *) spr, pos->x, pos->y, &x1, &x2, &x3, &x4,
                                        &y1, &y2, &y3, &y4);

                    const int32_t dax = mulscale14(sintable[(spr->ang-256+512)&2047],walldist+4);
                    const int32_t day = mulscale14(sintable[(spr->ang-256)&2047],walldist+4);
                    x1 += dax; x2 -= day; x3 -= dax; x4 += day;
                    y1 += day; y2 += dax; y3 -= day; y4 -= dax;

                    clipyou = get_floorspr_clipyou(x1, x2, x3, x4, y1, y2, y3, y4);
                    break;
                }
                }

                if (clipyou != 0)
                {
                    if ((pos->z > daz) && (daz > *ceilz
#ifdef YAX_ENABLE
                                           || (daz == *ceilz && yax_getbunch(clipsectorlist[i], YAX_CEILING)>=0)
#endif
                            ))
                    {
                        *ceilz = daz;
                        *ceilhit = j+49152;
                    }

                    if ((pos->z < daz2) && (daz2 < *florz
#ifdef YAX_ENABLE
                                            // can have a floor-sprite lying directly on the floor!
                                            || (daz2 == *florz && yax_getbunch(clipsectorlist[i], YAX_FLOOR)>=0)
#endif
                            ))
                    {
                        *florz = daz2;
                        *florhit = j+49152;
                    }
                }
            }
        }
    }

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (clipspritenum>0)
        goto beginagain;
#endif

#ifdef YAX_ENABLE
    if (numyaxbunches > 0)
    {
        const int32_t dasecclipmask = yax_waltosecmask(dawalclipmask);
        int16_t cb, fb, didchange;

        yax_getbunches(sectnum, &cb, &fb);

        mcf++;
        clipsectcnt = 0; clipsectnum = 0;

        didchange = 0;
        if (cb>=0 && mcf==0 && *ceilhit==sectnum+16384)
        {
            for (i=0; i<origclipsectnum; i++)
            {
                j = origclipsectorlist[i];
                if (yax_getbunch(j, YAX_CEILING) >= 0)
                    if (sector[j].ceilingstat&dasecclipmask)
                        break;
            }

            if (i==origclipsectnum)
                for (i=0; i<origclipsectnum; i++)
                {
                    cb = yax_getbunch(origclipsectorlist[i], YAX_CEILING);
                    if (cb < 0)
                        continue;

                    for (SECTORS_OF_BUNCH(cb,YAX_FLOOR, j))
                        if (inside(pos->x,pos->y, j)==1)
                        {
                            clipsectorlist[clipsectnum++] = j;
                            daz = getceilzofslope(j, pos->x,pos->y);
                            if (!didchange || daz > *ceilz)
                                didchange=1, *ceilhit = j+16384, *ceilz = daz;
                        }
                }

            if (clipsectnum==0)
                mcf++;
        }
        else if (mcf==0)
            mcf++;

        didchange = 0;
        if (fb>=0 && mcf==1 && *florhit==sectnum+16384)
        {
            for (i=0; i<origclipsectnum; i++)
            {
                j = origclipsectorlist[i];
                if (yax_getbunch(j, YAX_FLOOR) >= 0)
                    if (sector[j].floorstat&dasecclipmask)
                        break;
            }

            // (almost) same as above, but with floors...
            if (i==origclipsectnum)
                for (i=0; i<origclipsectnum; i++)
                {
                    fb = yax_getbunch(origclipsectorlist[i], YAX_FLOOR);
                    if (fb < 0)
                        continue;

                    for (SECTORS_OF_BUNCH(fb, YAX_CEILING, j))
                        if (inside(pos->x,pos->y, j)==1)
                        {
                            clipsectorlist[clipsectnum++] = j;
                            daz = getflorzofslope(j, pos->x,pos->y);
                            if (!didchange || daz < *florz)
                                didchange=1, *florhit = j+16384, *florz = daz;
                        }
                }
        }

        if (clipsectnum > 0)
        {
            // sector-like sprite re-init:
            curidx = -1;
            curspr = NULL;
            clipspritecnt = 0; clipspritenum = 0;

            goto restart_grand;
        }
    }
#endif
}

int32_t setaspect_new_use_dimen = 0;

void setaspect_new()
{
    if (r_usenewaspect && newaspect_enable && getrendermode() != REND_POLYMER)
    {
        // The correction factor 100/107 has been found
        // out experimentally. Squares FTW!
        int32_t vr, yx=(65536*4*100)/(3*107);
        int32_t y, x;

        const int32_t xd = setaspect_new_use_dimen ? xdimen : xdim;
        const int32_t yd = setaspect_new_use_dimen ? ydimen : ydim;

        if (fullscreen && !setaspect_new_use_dimen)
        {
            const int32_t screenw = r_screenxy/100;
            const int32_t screenh = r_screenxy%100;

            if (screenw==0 || screenh==0)
            {
                // Assume square pixel aspect.
                x = xd;
                y = yd;
            }
            else
            {
                int32_t pixratio;

                x = screenw;
                y = screenh;

                pixratio = divscale16(xdim*screenh, ydim*screenw);
                yx = divscale16(yx, pixratio);
            }
        }
        else
        {
            x = xd;
            y = yd;
        }

        vr = divscale16(x*3, y*4);

        setaspect(vr, yx);
    }
    else
        setaspect(65536, divscale16(ydim*320, xdim*200));
}

//
// setview
//
void setview(int32_t x1, int32_t y1, int32_t x2, int32_t y2)
{
    int32_t i;

    windowx1 = x1; wx1 = (x1<<12);
    windowy1 = y1; wy1 = (y1<<12);
    windowx2 = x2; wx2 = ((x2+1)<<12);
    windowy2 = y2; wy2 = ((y2+1)<<12);

    xdimen = (x2-x1)+1; halfxdimen = (xdimen>>1);
    xdimenrecip = divscale32(1L,xdimen);
    ydimen = (y2-y1)+1;

    fxdimen = (float) xdimen;
#ifdef USE_OPENGL
    fydimen = (float) ydimen;
#endif
    setaspect_new();

    for (i=0; i<windowx1; i++) { startumost[i] = 1, startdmost[i] = 0; }
    Bassert(windowx2 < xdim);  // xdim is the number of alloc'd elements in start*most[].
    for (i=windowx1; i<=windowx2; i++)
        { startumost[i] = windowy1, startdmost[i] = windowy2+1; }
    for (i=windowx2+1; i<xdim; i++) { startumost[i] = 1, startdmost[i] = 0; }
}


//
// setaspect
//
void setaspect(int32_t daxrange, int32_t daaspect)
{
    viewingrange = daxrange;
    viewingrangerecip = divscale32(1,daxrange);

    yxaspect = daaspect;
    xyaspect = divscale32(1,yxaspect);
    xdimenscale = scale(xdimen,yxaspect,320);
    xdimscale = scale(320,xyaspect,xdimen);
}


//
// flushperms
//
void flushperms(void)
{
    permhead = permtail = 0;
}


//
// rotatesprite
//
void rotatesprite_(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t picnum,
                   int8_t dashade, char dapalnum, int32_t dastat, uint8_t daalpha, uint8_t dablend,
                   int32_t cx1, int32_t cy1, int32_t cx2, int32_t cy2)
{
    int32_t i;

    if ((unsigned)picnum >= MAXTILES)
        return;

    if ((cx1 > cx2) || (cy1 > cy2)) return;
    if (z <= 16) return;
    DO_TILE_ANIM(picnum, (int16_t)0xc000);
    if ((tilesiz[picnum].x <= 0) || (tilesiz[picnum].y <= 0)) return;

    // Experimental / development bits. ONLY FOR INTERNAL USE!
    //  bit RS_CENTERORIGIN: see dorotspr_handle_bit2
    ////////////////////

    if (((dastat & RS_PERM) == 0) || (numpages < 2) || (beforedrawrooms != 0))
    {
        begindrawing(); //{{{
        dorotatesprite(sx,sy,z,a,picnum,dashade,dapalnum,dastat,daalpha,dablend,cx1,cy1,cx2,cy2,guniqhudid);
        enddrawing();   //}}}
    }

    if ((dastat & RS_NOMASK) && (cx1 <= 0) && (cy1 <= 0) && (cx2 >= xdim-1) && (cy2 >= ydim-1) &&
            (sx == (160<<16)) && (sy == (100<<16)) && (z == 65536L) && (a == 0) && ((dastat&RS_TRANS1) == 0))
        permhead = permtail = 0;

    if ((dastat & RS_PERM) == 0)
        return;

    if (numpages >= 2)
    {
        permfifotype *per = &permfifo[permhead];

        per->sx = sx; per->sy = sy; per->z = z; per->a = a;
        per->picnum = picnum;
        per->dashade = dashade; per->dapalnum = dapalnum;
        per->dastat = dastat;
        per->daalpha = daalpha;
        per->dablend = dablend;
        per->pagesleft = numpages+((beforedrawrooms&1)<<7);
        per->cx1 = cx1; per->cy1 = cy1; per->cx2 = cx2; per->cy2 = cy2;
        per->uniqid = guniqhudid;   //JF extension

        //Would be better to optimize out true bounding boxes
        if (dastat & RS_NOMASK)  //If non-masking write, checking for overlapping cases
        {
            for (i=permtail; i!=permhead; i=((i+1)&(MAXPERMS-1)))
            {
                permfifotype *per2 = &permfifo[i];

                if ((per2->pagesleft&127) == 0) continue;
                if (per2->sx != per->sx) continue;
                if (per2->sy != per->sy) continue;
                if (per2->z != per->z) continue;
                if (per2->a != per->a) continue;
                if (tilesiz[per2->picnum].x > tilesiz[per->picnum].x) continue;
                if (tilesiz[per2->picnum].y > tilesiz[per->picnum].y) continue;
                if (per2->cx1 < per->cx1) continue;
                if (per2->cy1 < per->cy1) continue;
                if (per2->cx2 > per->cx2) continue;
                if (per2->cy2 > per->cy2) continue;

                per2->pagesleft = 0;
            }

            if ((per->z == 65536) && (per->a == 0))
                for (i=permtail; i!=permhead; i=((i+1)&(MAXPERMS-1)))
                {
                    permfifotype *per2 = &permfifo[i];

                    if ((per2->pagesleft&127) == 0) continue;
                    if (per2->z != 65536) continue;
                    if (per2->a != 0) continue;
                    if (per2->cx1 < per->cx1) continue;
                    if (per2->cy1 < per->cy1) continue;
                    if (per2->cx2 > per->cx2) continue;
                    if (per2->cy2 > per->cy2) continue;
                    if ((per2->sx>>16) < (per->sx>>16)) continue;
                    if ((per2->sy>>16) < (per->sy>>16)) continue;
                    if ((per2->sx>>16)+tilesiz[per2->picnum].x > (per->sx>>16)+tilesiz[per->picnum].x) continue;
                    if ((per2->sy>>16)+tilesiz[per2->picnum].y > (per->sy>>16)+tilesiz[per->picnum].y) continue;

                    per2->pagesleft = 0;
                }
        }

        permhead = ((permhead+1)&(MAXPERMS-1));
    }
}

static int32_t palookup_isdefault(int32_t palnum)  // KEEPINSYNC engine.lua
{
    return (palookup[palnum] == NULL || (palnum!=0 && palookup[palnum] == palookup[0]));
}

static void maybe_alloc_palookup(int32_t palnum)
{
    if (palookup_isdefault(palnum))
    {
        alloc_palookup(palnum);
        if (palookup[palnum] == NULL)
            Bexit(1);
    }
}

void setblendtab(int32_t blend, const char *tab)
{
    if (blendtable[blend] == NULL)
        blendtable[blend] = (char *)Xmalloc(256*256);

    Bmemcpy(blendtable[blend], tab, 256*256);
}
void removeblendtab(int32_t const blend)
{
    DO_FREE_AND_NULL(blendtable[blend]);
}

#ifdef LUNATIC
const char *(getblendtab)(int32_t blend)
{
    return blendtable[blend];
}
#endif

int32_t setpalookup(int32_t palnum, const uint8_t *shtab)
{
    if (numshades != 32)
        return -1;

    if (shtab != NULL)
    {
        maybe_alloc_palookup(palnum);
        Bmemcpy(palookup[palnum], shtab, 256*numshades);
    }

    return 0;
}
void removepalookup(int32_t const palnum)
{
    if (palnum == 0 && palookup[palnum] != NULL)
    {
        for (int i = 1; i < MAXPALOOKUPS; i++)
            if (palookup[i] == palookup[palnum])
                palookup[i] = NULL;

        DO_FREE_AND_NULL(palookup[palnum]);
    }
    else if (palookup[palnum] == palookup[0])
        palookup[palnum] = NULL;
    else
        DO_FREE_AND_NULL(palookup[palnum]);
}

//
// makepalookup
//
void makepalookup(int32_t palnum, const char *remapbuf, uint8_t r, uint8_t g, uint8_t b, char noFloorPal)
{
    int32_t i, j;

    static char idmap[256] = {1};

    if (paletteloaded == 0)
        return;

    // NOTE: palnum==0 is allowed
    if ((unsigned)palnum >= MAXPALOOKUPS)
        return;

    g_noFloorPal[palnum] = noFloorPal;

    if (remapbuf==NULL)
    {
        if ((r|g|b) == 0)
        {
            palookup[palnum] = palookup[0];  // Alias to base shade table!
            return;
        }

        if (idmap[0]==1)  // init identity map
            for (i=0; i<256; i++)
                idmap[i] = i;

        remapbuf = idmap;
    }

    maybe_alloc_palookup(palnum);

    if ((r|g|b) == 0)
    {
        // "black fog"/visibility case -- only remap color indices

        for (j=0; j<numshades; j++)
            for (i=0; i<256; i++)
            {
                const char *src = palookup[0];
                palookup[palnum][256*j + i] = src[256*j + remapbuf[i]];
            }
    }
    else
    {
        // colored fog case

        char *ptr2 = palookup[palnum];

        for (i=0; i<numshades; i++)
        {
            int32_t palscale = divscale16(i,numshades-1);

            for (j=0; j<256; j++)
            {
                const char *ptr = (const char *)&palette[remapbuf[j]*3];
                *ptr2++ = getclosestcol(ptr[0] + mulscale16(r-ptr[0],palscale),
                                        ptr[1] + mulscale16(g-ptr[1],palscale),
                                        ptr[2] + mulscale16(b-ptr[2],palscale));
            }
        }
    }

#if defined(USE_OPENGL)
    palookupfog[palnum].r = r;
    palookupfog[palnum].g = g;
    palookupfog[palnum].b = b;
#endif
}

//
// setbasepal
//
void setbasepal(int32_t id, uint8_t const * const table)
{
    if (basepaltable[id] == NULL)
        basepaltable[id] = (uint8_t *)Xmalloc(768);

    Bmemcpy(basepaltable[id], table, 768);
}
void removebasepal(int32_t const id)
{
    if (id == 0)
        Bmemset(basepaltable[id], 0, 768);
    else
        DO_FREE_AND_NULL(basepaltable[id]);
}

//
// setbrightness
//
// flags:
//  1: don't setpalette(),  DON'T USE THIS FLAG!
//  2: don't gltexinvalidateall()
//  4: don't calc curbrightness from dabrightness,  DON'T USE THIS FLAG!
//  8: don't gltexinvalidate8()
// 16: don't reset palfade*
void setbrightness(char dabrightness, uint8_t dapalid, uint8_t flags)
{
    int32_t i, j, nohwgamma;
    const uint8_t *dapal;

#ifdef USE_OPENGL
    int32_t paldidchange;
#endif
    int32_t palsumdidchange;
//    uint32_t lastbright = curbrightness;

    Bassert((flags&4)==0);

    if (/*(unsigned)dapalid >= MAXBASEPALS ||*/ basepaltable[dapalid] == NULL)
        dapalid = 0;
#ifdef USE_OPENGL
    paldidchange = (curbasepal != dapalid || basepalreset);
#endif
    curbasepal = dapalid;
    basepalreset = 0;

    dapal = basepaltable[curbasepal];

    if (!(flags&4))
    {
        curbrightness = clamp(dabrightness, 0, 15);
//        if (lastbright != (unsigned)curbrightness)
//            vid_gamma = 1.0 + ((float)curbrightness / 10.0);
    }

    nohwgamma = setgamma();
    j = nohwgamma ? curbrightness : 0;

    for (i=0; i<256; i++)
    {
        // save palette without any brightness adjustment
        curpalette[i].r = dapal[i*3+0];
        curpalette[i].g = dapal[i*3+1];
        curpalette[i].b = dapal[i*3+2];
        curpalette[i].f = 0;

        // brightness adjust the palette
        curpalettefaded[i].b = britable[j][ curpalette[i].b ];
        curpalettefaded[i].g = britable[j][ curpalette[i].g ];
        curpalettefaded[i].r = britable[j][ curpalette[i].r ];
        curpalettefaded[i].f = 0;
    }

    if ((flags&16) && palfadedelta)  // keep the fade
        setpalettefade_calc(palfadedelta>>2);

    {
        static uint32_t lastpalettesum=0;
        uint32_t newpalettesum = XXH32((uint8_t *)curpalettefaded, sizeof(curpalettefaded), sizeof(curpalettefaded));

        palsumdidchange = (newpalettesum != lastpalettesum);

        if (palsumdidchange || newpalettesum != g_lastpalettesum)
        {
//            if ((flags&1) == 0)
                setpalette(0,256);
        }

        g_lastpalettesum = lastpalettesum = newpalettesum;
    }

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        // Only reset the textures if the corresponding preserve flags are clear and
        // either (a) the new palette is different to the last, or (b) the brightness
        // changed and we couldn't set it using hardware gamma.

        // XXX: no-HW-gamma OpenGL platforms will exhibit bad performance with
        // simultaneous basepal and tint changes?
        const int32_t doinvalidate = (paldidchange || (palsumdidchange && nohwgamma));

        if (!(flags&2) && doinvalidate)
            gltexinvalidatetype(INVALIDATE_ALL);
        if (!(flags&8) && doinvalidate)
            gltexinvalidatetype(INVALIDATE_ART);
#ifdef POLYMER
        if ((getrendermode() == REND_POLYMER) && doinvalidate)
            polymer_texinvalidate();
#endif
    }
#endif

    if ((flags&16)==0)
    {
        palfadergb.r = palfadergb.g = palfadergb.b = 0;
        palfadedelta = 0;
    }
}

static inline palette_t getpal(int32_t col)
{
    if (gammabrightness) return curpalette[col];
    else
    {
        palette_t p;
        p.b = britable[curbrightness][ curpalette[col].b ];
        p.g	= britable[curbrightness][ curpalette[col].g ];
        p.r = britable[curbrightness][ curpalette[col].r ];
//#ifdef __APPLE__
        p.f = 0;  // make gcc on osx happy
//#endif
        return p;
    }
}

static void setpalettefade_calc(uint8_t offset)
{
    int32_t i;
    palette_t p;

    for (i=0; i<256; i++)
    {
        p = getpal(i);

        curpalettefaded[i].b =
            p.b + (((palfadergb.b - p.b) * offset) >> 8);
        curpalettefaded[i].g =
            p.g + (((palfadergb.g - p.g) * offset) >> 8);
        curpalettefaded[i].r =
            p.r + (((palfadergb.r - p.r) * offset) >> 8);
        curpalettefaded[i].f = 0;
    }
}

//#define DEBUG_PALETTEFADE

//
// setpalettefade
//
void setpalettefade(uint8_t r, uint8_t g, uint8_t b, uint8_t offset)
{
    palfadergb.r = r;
    palfadergb.g = g;
    palfadergb.b = b;
#ifdef DEBUG_PALETTEFADE
    if (offset)
        offset = max(offset, 128);
#endif
    palfadedelta = offset;

    setpalettefade_calc(offset);

    {
        static uint32_t lastpalettesum=0;
        uint32_t newpalettesum = XXH32((uint8_t *)curpalettefaded, sizeof(curpalettefaded), sizeof(curpalettefaded));

        if (newpalettesum != lastpalettesum || newpalettesum != g_lastpalettesum)
            setpalette(0,256);

        g_lastpalettesum = lastpalettesum = newpalettesum;
    }
}


//
// clearview
//
void clearview(int32_t dacol)
{
    intptr_t p;
    int32_t  y, dx;

    if (!in3dmode() && dacol != -1) return;

    if (dacol == -1) dacol = 0;

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        palette_t p = getpal(dacol);

        bglClearColor((float)p.r * (1.f/255.f),
                      (float)p.g * (1.f/255.f),
                      (float)p.b * (1.f/255.f),
                      0);
        bglClear(GL_COLOR_BUFFER_BIT);
        return;
    }
#endif

    begindrawing(); //{{{
    dx = windowx2-windowx1+1;
    //dacol += (dacol<<8); dacol += (dacol<<16);
    p = frameplace+ylookup[windowy1]+windowx1;
    for (y=windowy1; y<=windowy2; y++)
    {
        //clearbufbyte((void*)p,dx,dacol);
        Bmemset((void *)p,dacol,dx);
        p += ylookup[1];
    }
    enddrawing();   //}}}

    faketimerhandler();
}


//
// clearallviews
//
void clearallviews(int32_t dacol)
{
    if (!in3dmode()) return;
    //dacol += (dacol<<8); dacol += (dacol<<16);

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        palette_t p = getpal(dacol);

        bglViewport(0,0,xdim,ydim); glox1 = -1;
        bglClearColor((float)p.r * (1.f/255.f),
                      (float)p.g * (1.f/255.f),
                      (float)p.b * (1.f/255.f),
                      0);
        bglClear(GL_COLOR_BUFFER_BIT);
        return;
    }
#endif

    begindrawing(); //{{{
    Bmemset((void *)frameplace,dacol,bytesperline*yres);
    enddrawing();   //}}}
    //nextpage();

    faketimerhandler();
}


//
// plotpixel
//
void plotpixel(int32_t x, int32_t y, char col)
{
    // XXX: if we ever want the editor to work under GL ES, find a replacement for the raster functions
#if defined USE_OPENGL && !defined EDUKE32_GLES
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        palette_t p = getpal(col);

        bglRasterPos4i(x, y, 0, 1);
        bglDrawPixels(1, 1, GL_RGB, GL_UNSIGNED_BYTE, &p);
        bglRasterPos4i(0, 0, 0, 1);
        return;
    }
#endif

    begindrawing(); //{{{
    drawpixel_safe((void *)(ylookup[y]+x+frameplace), col);
    enddrawing();   //}}}
}

void plotlines2d(const int32_t *xx, const int32_t *yy, int32_t numpoints, int col)
{
    int32_t i;

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        palette_t p = getpal(col);

        bglBegin(GL_LINE_STRIP);

        bglColor4ub(p.r, p.g, p.b, 1);

        for (i=0; i<numpoints; i++)
            bglVertex2i(xx[i], yy[i]);

        bglEnd();
        return;
    }
#endif
    {
        int32_t odrawlinepat = drawlinepat;
        drawlinepat = 0xffffffff;

        begindrawing();
        for (i=0; i<numpoints-1; i++)
            drawline16(xx[i], yy[i], xx[i+1], yy[i+1], col);
        enddrawing();

        drawlinepat = odrawlinepat;
    }
}


//
// getpixel
//
char getpixel(int32_t x, int32_t y)
{
    char r;

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode()) return 0;
#endif

    begindrawing(); //{{{
    r = readpixel((void *)(ylookup[y]+x+frameplace));
    enddrawing();   //}}}
    return(r);
}


//MUST USE RESTOREFORDRAWROOMS AFTER DRAWING

//
// setviewtotile
//
void setviewtotile(int16_t tilenume, int32_t xsiz, int32_t ysiz)
{
    //DRAWROOMS TO TILE BACKUP&SET CODE
    tilesiz[tilenume].x = xsiz; tilesiz[tilenume].y = ysiz;
    bakxsiz[setviewcnt] = xsiz; bakysiz[setviewcnt] = ysiz;
    bakframeplace[setviewcnt] = frameplace; frameplace = waloff[tilenume];
    bakwindowx1[setviewcnt] = windowx1; bakwindowy1[setviewcnt] = windowy1;
    bakwindowx2[setviewcnt] = windowx2; bakwindowy2[setviewcnt] = windowy2;

    if (setviewcnt == 0)
    {
#ifdef USE_OPENGL
        bakrendmode = rendmode;
#endif
        baktile = tilenume;
    }

#ifdef USE_OPENGL
    rendmode = REND_CLASSIC;
#endif

    copybufbyte(&startumost[windowx1],&bakumost[windowx1],(windowx2-windowx1+1)*sizeof(bakumost[0]));
    copybufbyte(&startdmost[windowx1],&bakdmost[windowx1],(windowx2-windowx1+1)*sizeof(bakdmost[0]));
    setviewcnt++;

    offscreenrendering = 1;
    setview(0,0,ysiz-1,xsiz-1);
    setaspect(65536,65536);

    calc_ylookup(ysiz, xsiz);
}


//
// setviewback
//
extern char modechange;
void setviewback(void)
{
    int32_t k;

    if (setviewcnt <= 0) return;
    setviewcnt--;

    offscreenrendering = (setviewcnt>0);
#ifdef USE_OPENGL
    if (setviewcnt == 0)
    {
        rendmode = bakrendmode;
        invalidatetile(baktile,-1,-1);
    }
#endif

    setview(bakwindowx1[setviewcnt],bakwindowy1[setviewcnt],
            bakwindowx2[setviewcnt],bakwindowy2[setviewcnt]);
    copybufbyte(&bakumost[windowx1],&startumost[windowx1],(windowx2-windowx1+1)*sizeof(startumost[0]));
    copybufbyte(&bakdmost[windowx1],&startdmost[windowx1],(windowx2-windowx1+1)*sizeof(startdmost[0]));
    frameplace = bakframeplace[setviewcnt];

    if (setviewcnt == 0)
        k = bakxsiz[0];
    else
        k = max(bakxsiz[setviewcnt-1],bakxsiz[setviewcnt]);
    calc_ylookup(bytesperline, k);

    modechange=1;
}


//
// squarerotatetile
//
void squarerotatetile(int16_t tilenume)
{
    int32_t siz = tilesiz[tilenume].x;
    int32_t i, j;
    char *ptr1, *ptr2;

    if (siz != tilesiz[tilenume].y)
        return;
    
    for (i=siz-1; i>=3; i-=4)
    {
        ptr2 = ptr1 = (char *) (waloff[tilenume]+i*(siz+1));
        swapchar(--ptr1, (ptr2 -= siz));
        j=(i>>1)-1;
        for (; j>=0; j--) swapchar2((ptr1 -= 2), (ptr2 -= (siz<<1)), siz);

        ptr2 = ptr1 = (char *) (waloff[tilenume]+(i-1)*(siz+1));
        j=((i-1)>>1)-1;
        for (; j>=0; j--) swapchar2((ptr1 -= 2), (ptr2 -= (siz<<1)), siz);

        ptr2 = ptr1 = (char *) (waloff[tilenume]+(i-2)*(siz+1));
        swapchar(--ptr1, (ptr2 -= siz));
        j=((i-2)>>1)-1;
        for (; j>=0; j--) swapchar2((ptr1 -= 2), (ptr2 -= (siz<<1)), siz);

        ptr2 = ptr1 = (char *) (waloff[tilenume]+(i-3)*(siz+1));
        j=((i-3)>>1)-1;
        for (; j>=0; j--) swapchar2((ptr1 -= 2), (ptr2 -= (siz<<1)), siz);
    }
}

//
// preparemirror
//
void preparemirror(int32_t dax, int32_t day, int16_t daang, int16_t dawall,
                   int32_t *tposx, int32_t *tposy, int16_t *tang)
{
    int32_t i;

    const int32_t x = wall[dawall].x, dx = wall[wall[dawall].point2].x-x;
    const int32_t y = wall[dawall].y, dy = wall[wall[dawall].point2].y-y;

    const int32_t j = dx*dx + dy*dy;
    if (j == 0)
        return;

    i = ((dax-x)*dx + (day-y)*dy)<<1;

    *tposx = (x<<1) + scale(dx,i,j) - dax;
    *tposy = (y<<1) + scale(dy,i,j) - day;
    *tang = ((getangle(dx,dy)<<1)-daang)&2047;

    inpreparemirror = 1;
}


//
// completemirror
//
void completemirror(void)
{
#ifdef USE_OPENGL
    if (getrendermode() != REND_CLASSIC)
        return;
#endif

    // Can't reverse when the world has not yet been drawn from the other side.
    if (inpreparemirror) { inpreparemirror = 0; return; }

    // The mirroring code maps the rightmost pixel to the right neighbor of the
    // leftmost one (see copybufreverse() call below). Thus, the leftmost would
    // be mapped to the right neighbor of the rightmost one, which would be out
    // of bounds.
    if (mirrorsx1 == 0)
        mirrorsx1 = 1;

    // Require that the mirror is at least one pixel wide before padding.
    if (mirrorsx1 > mirrorsx2)
        return;

    // Variables mirrorsx{1,2} refer to the source scene here, the one drawn
    // from the inside of the mirror.

    begindrawing();
    {
        // Width in pixels (screen x's are inclusive on both sides):
        const int32_t width = mirrorsx2-mirrorsx1+1;
        // Height in pixels (screen y's are half-open because they come from umost/dmost):
        const int32_t height = mirrorsy2-mirrorsy1;

        // Address of the mirror wall's top left corner in the source scene:
        intptr_t p = frameplace + ylookup[windowy1+mirrorsy1] + windowx1+mirrorsx1;

        // Offset (wrt p) of a mirror line's left corner in the destination:
        // p+destof == frameplace + ylookup[...] + windowx2-mirrorsx2
        const int32_t destofs = windowx2-mirrorsx2-windowx1-mirrorsx1;

        int32_t y;

        for (y=0; y<height; y++)
        {
#if 0
            if ((p-frameplace) + width-1 >= bytesperline*ydim)
                printf("oob read: mirrorsx1=%d, mirrorsx2=%d\n", mirrorsx1, mirrorsx2);
#endif
            copybufbyte((void *)p, tempbuf, width);
            copybufreverse(&tempbuf[width-1], (void *)(p+destofs+1), width);

            p += ylookup[1];
            faketimerhandler();
        }
    }
    enddrawing();
}


//
// sectorofwall
//
static int32_t sectorofwall_internal(int16_t theline)
{
    int32_t gap = numsectors>>1, i = gap;

    while (gap > 1)
    {
        gap >>= 1;
        if (sector[i].wallptr < theline) i += gap; else i -= gap;
    }
    while (sector[i].wallptr > theline) i--;
    while (sector[i].wallptr+sector[i].wallnum <= theline) i++;

    return i;
}

int32_t sectorofwall(int16_t theline)
{
    int32_t i;

    if (theline < 0 || theline >= numwalls)
        return -1;

    i = wall[theline].nextwall;
    if (i >= 0 && i < MAXWALLS)
        return wall[i].nextsector;

    return sectorofwall_internal(theline);
}

int32_t sectorofwall_noquick(int16_t theline)
{
    if (theline < 0 || theline >= numwalls)
        return -1;

    return sectorofwall_internal(theline);
}


int32_t getceilzofslopeptr(const sectortype *sec, int32_t dax, int32_t day)
{
    if (!(sec->ceilingstat&2))
        return sec->ceilingz;

    {
        const walltype *wal = &wall[sec->wallptr];

        // floor(sqrt(2**31-1)) == 46340
        int32_t i, j, wx=wal->x, wy=wal->y;
        int32_t dx = wall[wal->point2].x-wx, dy = wall[wal->point2].y-wy;

        i = nsqrtasm(uhypsq(dx,dy))<<5;
        if (i == 0)
            return sec->ceilingz;

        j = dmulscale3(dx, day-wy, -dy, dax-wx);
        return sec->ceilingz + (scale(sec->ceilingheinum,j>>1,i)<<1);
    }
}

int32_t getflorzofslopeptr(const sectortype *sec, int32_t dax, int32_t day)
{
    if (!(sec->floorstat&2))
        return sec->floorz;

    {
        const walltype *wal = &wall[sec->wallptr];

        int32_t i, j, wx=wal->x, wy=wal->y;
        int32_t dx = wall[wal->point2].x-wx, dy = wall[wal->point2].y-wy;

        i = nsqrtasm(uhypsq(dx,dy))<<5;
        if (i == 0)
            return sec->floorz;

        j = dmulscale3(dx, day-wy, -dy, dax-wx);
        return sec->floorz + (scale(sec->floorheinum,j>>1,i)<<1);
    }
}

void getzsofslopeptr(const sectortype *sec, int32_t dax, int32_t day, int32_t *ceilz, int32_t *florz)
{
    *ceilz = sec->ceilingz; *florz = sec->floorz;

    if ((sec->ceilingstat|sec->floorstat)&2)
    {
        int32_t i, j;
        const walltype *wal = &wall[sec->wallptr], *wal2 = &wall[wal->point2];
        const int32_t dx = wal2->x-wal->x, dy = wal2->y-wal->y;

        i = nsqrtasm(uhypsq(dx,dy))<<5;
        if (i == 0)
            return;

        j = dmulscale3(dx,day-wal->y, -dy,dax-wal->x);
        if (sec->ceilingstat&2)
            *ceilz += scale(sec->ceilingheinum,j>>1,i)<<1;
        if (sec->floorstat&2)
            *florz += scale(sec->floorheinum,j>>1,i)<<1;
    }
}


//
// alignceilslope
//
void alignceilslope(int16_t dasect, int32_t x, int32_t y, int32_t z)
{
    const walltype *const wal = &wall[sector[dasect].wallptr];
    const int32_t dax = wall[wal->point2].x-wal->x;
    const int32_t day = wall[wal->point2].y-wal->y;

    const int32_t i = (y-wal->y)*dax - (x-wal->x)*day;
    if (i == 0)
        return;

    sector[dasect].ceilingheinum = scale((z-sector[dasect].ceilingz)<<8,
                                         nsqrtasm(uhypsq(dax,day)), i);
    if (sector[dasect].ceilingheinum == 0)
        sector[dasect].ceilingstat &= ~2;
    else sector[dasect].ceilingstat |= 2;
}


//
// alignflorslope
//
void alignflorslope(int16_t dasect, int32_t x, int32_t y, int32_t z)
{
    const walltype *const wal = &wall[sector[dasect].wallptr];
    const int32_t dax = wall[wal->point2].x-wal->x;
    const int32_t day = wall[wal->point2].y-wal->y;

    const int32_t i = (y-wal->y)*dax - (x-wal->x)*day;
    if (i == 0)
        return;

    sector[dasect].floorheinum = scale((z-sector[dasect].floorz)<<8,
                                       nsqrtasm(uhypsq(dax,day)), i);
    if (sector[dasect].floorheinum == 0)
        sector[dasect].floorstat &= ~2;
    else sector[dasect].floorstat |= 2;
}


//
// loopnumofsector
//
int32_t loopnumofsector(int16_t sectnum, int16_t wallnum)
{
    int32_t i;

    int32_t numloops = 0;
    const int32_t startwall = sector[sectnum].wallptr;
    const int32_t endwall = startwall + sector[sectnum].wallnum;

    for (i=startwall; i<endwall; i++)
    {
        if (i == wallnum)
            return numloops;

        if (wall[i].point2 < i)
            numloops++;
    }

    return -1;
}


//
// setfirstwall
//
void setfirstwall(int16_t sectnum, int16_t newfirstwall)
{
    int32_t i, j, numwallsofloop;
    int32_t dagoalloop;
    walltype *tmpwall;

    const int32_t startwall = sector[sectnum].wallptr;
    const int32_t danumwalls = sector[sectnum].wallnum;
    const int32_t endwall = startwall+danumwalls;

    if (newfirstwall < startwall || newfirstwall >= startwall+danumwalls)
        return;

    tmpwall = (walltype *)Xmalloc(danumwalls * sizeof(walltype));

    Bmemcpy(tmpwall, &wall[startwall], danumwalls*sizeof(walltype));

    numwallsofloop = 0;
    i = newfirstwall;
    do
    {
        numwallsofloop++;
        i = wall[i].point2;
    }
    while (i != newfirstwall);

    //Put correct loop at beginning
    dagoalloop = loopnumofsector(sectnum,newfirstwall);
    if (dagoalloop > 0)
    {
        j = 0;
        while (loopnumofsector(sectnum,j+startwall) != dagoalloop)
            j++;

        for (i=0; i<danumwalls; i++)
        {
            int32_t k = i+j;
            if (k >= danumwalls) k -= danumwalls;
            Bmemcpy(&wall[startwall+i], &tmpwall[k], sizeof(walltype));

            wall[startwall+i].point2 += danumwalls-startwall-j;
            if (wall[startwall+i].point2 >= danumwalls)
                wall[startwall+i].point2 -= danumwalls;
            wall[startwall+i].point2 += startwall;
        }

        newfirstwall += danumwalls-j;
        if (newfirstwall >= startwall+danumwalls)
            newfirstwall -= danumwalls;
    }

    for (i=0; i<numwallsofloop; i++)
        Bmemcpy(&tmpwall[i], &wall[i+startwall], sizeof(walltype));
    for (i=0; i<numwallsofloop; i++)
    {
        int32_t k = i+newfirstwall-startwall;
        if (k >= numwallsofloop) k -= numwallsofloop;
        Bmemcpy(&wall[startwall+i], &tmpwall[k], sizeof(walltype));

        wall[startwall+i].point2 += numwallsofloop-newfirstwall;
        if (wall[startwall+i].point2 >= numwallsofloop)
            wall[startwall+i].point2 -= numwallsofloop;
        wall[startwall+i].point2 += startwall;
    }

    for (i=startwall; i<endwall; i++)
        if (wall[i].nextwall >= 0)
            wall[wall[i].nextwall].nextwall = i;

#ifdef YAX_ENABLE
    {
        int16_t cb, fb;
        yax_getbunches(sectnum, &cb, &fb);

        if (cb>=0 || fb>=0)
        {
            for (i=startwall; i<endwall; i++)
            {
                j = yax_getnextwall(i, YAX_CEILING);
                if (j >= 0)
                    yax_setnextwall(j, YAX_FLOOR, i);

                j = yax_getnextwall(i, YAX_FLOOR);
                if (j >= 0)
                    yax_setnextwall(j, YAX_CEILING, i);
            }
        }
    }
#endif

    Bfree(tmpwall);
}


//
// drawline256
//
void drawline256(int32_t x1, int32_t y1, int32_t x2, int32_t y2, char col)
{
    int32_t dx, dy, i, j, inc, plc, daend;
    intptr_t p;

    col = palookup[0][col];

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        palette_t p = getpal(col);

//        setpolymost2dview();	// JBF 20040205: more efficient setup

        bglViewport(0, 0, xres, yres);
        bglMatrixMode(GL_PROJECTION);
        bglLoadIdentity();
        bglOrtho(0, xres, yres, 0, -1, 1);
		if (getrendermode() == REND_POLYMER)
		{
			bglMatrixMode(GL_MODELVIEW);
			bglLoadIdentity();
		}

        gloy1 = -1;
        bglDisable(GL_ALPHA_TEST);
        bglDisable(GL_DEPTH_TEST);
        bglDisable(GL_TEXTURE_2D);
        bglEnable(GL_BLEND);	// When using line antialiasing, this is needed

        bglBegin(GL_LINES);
        bglColor4ub(p.r, p.g, p.b, 255);
        bglVertex2f((float)x1 * (1.f/4096.f), (float)y1 * (1.f/4096.f));
        bglVertex2f((float)x2 * (1.f/4096.f), (float)y2 * (1.f/4096.f));

        bglEnd();

        return;
    }
#endif

    dx = x2-x1; dy = y2-y1;
    if (dx >= 0)
    {
        if ((x1 >= wx2) || (x2 < wx1)) return;
        if (x1 < wx1) y1 += scale(wx1-x1,dy,dx), x1 = wx1;
        if (x2 > wx2) y2 += scale(wx2-x2,dy,dx), x2 = wx2;
    }
    else
    {
        if ((x2 >= wx2) || (x1 < wx1)) return;
        if (x2 < wx1) y2 += scale(wx1-x2,dy,dx), x2 = wx1;
        if (x1 > wx2) y1 += scale(wx2-x1,dy,dx), x1 = wx2;
    }
    if (dy >= 0)
    {
        if ((y1 >= wy2) || (y2 < wy1)) return;
        if (y1 < wy1) x1 += scale(wy1-y1,dx,dy), y1 = wy1;
        if (y2 > wy2) x2 += scale(wy2-y2,dx,dy), y2 = wy2;
    }
    else
    {
        if ((y2 >= wy2) || (y1 < wy1)) return;
        if (y2 < wy1) x2 += scale(wy1-y2,dx,dy), y2 = wy1;
        if (y1 > wy2) x1 += scale(wy2-y1,dx,dy), y1 = wy2;
    }

    if (klabs(dx) >= klabs(dy))
    {
        if (dx == 0) return;
        if (dx < 0)
        {
            i = x1; x1 = x2; x2 = i;
            i = y1; y1 = y2; y2 = i;
        }

        inc = divscale12(dy,dx);
        plc = y1+mulscale12((2047-x1)&4095,inc);
        i = ((x1+2048)>>12); daend = ((x2+2048)>>12);

        begindrawing(); //{{{
        for (; i<daend; i++)
        {
            j = (plc>>12);
            if ((j >= startumost[i]) && (j < startdmost[i]))
                drawpixel_safe((void *)(frameplace+ylookup[j]+i),col);
            plc += inc;
        }
        enddrawing();   //}}}
    }
    else
    {
        if (dy < 0)
        {
            i = x1; x1 = x2; x2 = i;
            i = y1; y1 = y2; y2 = i;
        }

        inc = divscale12(dx,dy);
        plc = x1+mulscale12((2047-y1)&4095,inc);
        i = ((y1+2048)>>12); daend = ((y2+2048)>>12);

        begindrawing(); //{{{
        p = ylookup[i]+frameplace;
        for (; i<daend; i++)
        {
            j = (plc>>12);
            if ((i >= startumost[j]) && (i < startdmost[j]))
                drawpixel_safe((void *)(j+p),col);
            plc += inc; p += ylookup[1];
        }
        enddrawing();   //}}}
    }
}

//static void attach_here() {}

//
// drawline16
//
// JBF: Had to add extra tests to make sure x-coordinates weren't winding up -'ve
//   after clipping or crashes would ensue
uint32_t drawlinepat = 0xffffffff;

int32_t drawline16(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int col)
{
//int32_t odx,ody;
//int32_t ox1=x1,oy1=y1, ox2=x2,oy2=y2;

    vec2_t d ={ x2-x1, y2-y1 };

//odx=dx;
//ody=dy;

    if (d.x < 0)
    {
        swaplong(&x1, &x2);
        swaplong(&y1, &y2);
    }

    if (x1 >= xres || x2 < 0)
        return 0;

    if (x1 < 0)
    {
        if (d.y) y1 += scale(0-x1,d.y,d.x);
        x1 = 0;
    }

    if (x2 >= xres)
    {
        if (d.y) y2 += scale(xres-1-x2,d.y,d.x);
        x2 = xres-1;
    }

    if ((d.x < 0 && d.y >= 0) || (d.y < 0 && d.x >= 0))
    {
        swaplong(&x1, &x2);
        swaplong(&y1, &y2);
    }

    if (y1 >= ydim16 || y2 < 0)
        return 0;

    if (y1 < 0)
    {
        if (d.x)
            x1 = clamp(x1 + scale(0 - y1, d.x, d.y), 0, xres - 1);
        y1 = 0;
    }

    if (y2 >= ydim16)
    {
        if (d.x)
            x2 = clamp(x2 + scale(ydim16-1-y2, d.x, d.y), 0, xres-1);
        y2 = ydim16-1;
    }

    if (d.y < 0)
    {
        swaplong(&x1, &x2);
        swaplong(&y1, &y2);
    }

//if (ox1||ox2||oy1||oy2)
//    if (x1<0||x1>=xres || y2<0||y2>=yres)
//        attach_here();

    d.x = klabs(x2-x1)+1;
    d.y = klabs(y2-y1)+1;

    if ((d.x >= d.y && x2 < x1) || (d.x < d.y && y2 < y1))
    {
        swaplong(&x1, &x2);
        swaplong(&y1, &y2);
    }

    int pinc, inc = 1;

    begindrawing(); //{{{

    intptr_t p = (y1*bytesperline)+x1+frameplace;

    if (d.x >= d.y)
    {
        pinc = (y2 > y1) ? bytesperline : -bytesperline;
    }
    else
    {
        pinc = (x2 > x1) ? 1 : -1;
        swaplong(&d.x, &d.y);
        inc = bytesperline;
    }

    int const trans = (col < 0);

    if (trans)
    {
        col = -col;

        if (drawlinepat == 0xffffffff)
        {
            for (int i=d.x, df=0; i>0; i--)
            {
                drawtranspixel((char *) p, col);
                df += d.y;
                if (df >= d.x) { df -= d.x; p += pinc; }
                p += inc;
            }
        }
        else
        {
            uint32_t patc = UINT_MAX;

            for (int i=d.x, df=0; i>0; i--)
            {
                if (drawlinepat & pow2long[(++patc)&31])
                    drawtranspixel((char *) p, col);
                df += d.y;
                if (df >= d.x) { df -= d.x; p += pinc; }
                p += inc;
            }
        }

        enddrawing();   //}}}

        return 1;
    }

    if (inc == 1 && d.y == 1 && drawlinepat == 0xffffffff)
        clearbufbyte((void *)p, d.x, ((int32_t) col<<24)|((int32_t) col<<16)|((int32_t) col<<8)|col);
    else if (drawlinepat == 0xffffffff)
    {
        for (int i=d.x, df=0; i>0; i--)
        {
            drawpixel((char *) p, col);
            df += d.y;
            if (df >= d.x) { df -= d.x; p += pinc; }
            p += inc;
        }
    }
    else
    {
        uint32_t patc = UINT_MAX;

        for (int i=d.x, df=0; i>0; i--)
        {
            if (drawlinepat & pow2long[(++patc)&31])
                drawpixel((char *) p, col);
            df += d.y;
            if (df >= d.x) { df -= d.x; p += pinc; }
            p += inc;
        }
    }

    enddrawing();   //}}}

    return 1;
}

FORCE_INLINE void drawline16mid(int32_t x1, int32_t y1, int32_t x2, int32_t y2, char col)
{
    drawline16(halfxdim16+x1,midydim16+y1, halfxdim16+x2,midydim16+y2, col);
}

// eccen: eccentricity of the ellipse,
//   16384: circle
//  <16384: shrink in y
//  >16384: grow in y
void drawcircle16(int32_t x1, int32_t y1, int32_t r, int32_t eccen, char col)
{
    if (eccen != 16384)
    {
        // JonoF's rough approximation of a circle
        int32_t l, spx, spy, lpx, lpy, px, py;

        spx = lpx = x1 + mulscale14(r, sintable[0]);
        spy = lpy = y1 + mulscale14(eccen, mulscale14(r, sintable[512]));

        for (l=64; l<2048; l+=64)
        {
            px = x1 + mulscale14(r, sintable[l]);
            py = y1 + mulscale14(eccen, mulscale14(r, sintable[(l+512)&2047]));

            drawline16(lpx, lpy, px, py, col);

            lpx = px;
            lpy = py;
        }

        drawline16(lpx, lpy, spx, spy, col);

        return;
    }

    if (r < 0) r = -r;
    if (x1+r < 0 || y1+r < 0 || x1-r >= xres || y1-r >= ydim16) return;

    uint32_t const uxres = xres, uydim16 = ydim16;

    /*
        *      d
        *    6 | 7
        *   \  |  /
        *  5  \|/  8
        * c----+----a
        *  4  /|\  1
        *   /  |  \
        *    3 | 2
        *      b
        */

    begindrawing();
    intptr_t const p = (y1*bytesperline)+x1+frameplace;

    uint32_t patc = UINT_MAX;

    if (drawlinepat == 0xffffffff || drawlinepat & pow2long[(++patc)&31])
    {
        if ((uint32_t)y1 < uydim16 && (uint32_t)(x1+r) < uxres)
            drawpixel((char *)(p+r), col);    // a
        if ((uint32_t)x1 < uxres   && (uint32_t)(y1+r) < uydim16)
            drawpixel((char *)(p+(r*bytesperline)), col);    // b
        if ((uint32_t)y1 < uydim16 && (uint32_t)(x1-r) < uxres)
            drawpixel((char *)(p-r), col);    // c
        if ((uint32_t)x1 < uxres   && (uint32_t)(y1-r) < uydim16)
            drawpixel((char *)(p-(r*bytesperline)), col);    // d
    }

    int32_t xp = 0, yp = r;
    int32_t d = 1 - r, de = 2, dse = 5 - (r << 1);

    if (drawlinepat != 0xffffffff)
    {
        do
        {
            if (d < 0)
            {
                d += de;
                dse += 2;
            }
            else
            {
                d += dse;
                dse += 4;
                yp--;
            }

            xp++;
            de += 2;

            int32_t const ypbpl = yp*bytesperline;
            int32_t const xpbpl = xp*bytesperline;

            if (drawlinepat & pow2long[(++patc) & 31])
            {
                if ((uint32_t)(x1 + yp) < uxres && (uint32_t)(y1 + xp) < uydim16)
                    drawpixel_safe((char *)(p + yp + xpbpl), col);  // 1
                if ((uint32_t)(x1 + xp) < uxres && (uint32_t)(y1 + yp) < uydim16)
                    drawpixel_safe((char *)(p + xp + ypbpl), col);  // 2
                if ((uint32_t)(x1 - xp) < uxres && (uint32_t)(y1 + yp) < uydim16)
                    drawpixel_safe((char *)(p - xp + ypbpl), col);  // 3
                if ((uint32_t)(x1 - yp) < uxres && (uint32_t)(y1 + xp) < uydim16)
                    drawpixel_safe((char *)(p - yp + xpbpl), col);  // 4
                if ((uint32_t)(x1 - yp) < uxres && (uint32_t)(y1 - xp) < uydim16)
                    drawpixel_safe((char *)(p - yp - xpbpl), col);  // 5
                if ((uint32_t)(x1 - xp) < uxres && (uint32_t)(y1 - yp) < uydim16)
                    drawpixel_safe((char *)(p - xp - ypbpl), col);  // 6
                if ((uint32_t)(x1 + xp) < uxres && (uint32_t)(y1 - yp) < uydim16)
                    drawpixel_safe((char *)(p + xp - ypbpl), col);  // 7
                if ((uint32_t)(x1 + yp) < uxres && (uint32_t)(y1 - xp) < uydim16)
                    drawpixel_safe((char *)(p + yp - xpbpl), col);  // 8
            }
        } while (yp > xp);

        enddrawing();
        return;
    }

    do
    {
        if (d < 0)
        {
            d += de;
            dse += 2;
        }
        else
        {
            d += dse;
            dse += 4;
            yp--;
        }

        xp++;
        de += 2;

        int32_t const ypbpl = yp*bytesperline;
        int32_t const xpbpl = xp*bytesperline;

        if ((uint32_t)(x1 + yp) < uxres && (uint32_t)(y1 + xp) < uydim16)
            drawpixel_safe((char *)(p + yp + xpbpl), col);  // 1
        if ((uint32_t)(x1 + xp) < uxres && (uint32_t)(y1 + yp) < uydim16)
            drawpixel_safe((char *)(p + xp + ypbpl), col);  // 2
        if ((uint32_t)(x1 - xp) < uxres && (uint32_t)(y1 + yp) < uydim16)
            drawpixel_safe((char *)(p - xp + ypbpl), col);  // 3
        if ((uint32_t)(x1 - yp) < uxres && (uint32_t)(y1 + xp) < uydim16)
            drawpixel_safe((char *)(p - yp + xpbpl), col);  // 4
        if ((uint32_t)(x1 - yp) < uxres && (uint32_t)(y1 - xp) < uydim16)
            drawpixel_safe((char *)(p - yp - xpbpl), col);  // 5
        if ((uint32_t)(x1 - xp) < uxres && (uint32_t)(y1 - yp) < uydim16)
            drawpixel_safe((char *)(p - xp - ypbpl), col);  // 6
        if ((uint32_t)(x1 + xp) < uxres && (uint32_t)(y1 - yp) < uydim16)
            drawpixel_safe((char *)(p + xp - ypbpl), col);  // 7
        if ((uint32_t)(x1 + yp) < uxres && (uint32_t)(y1 - xp) < uydim16)
            drawpixel_safe((char *)(p + yp - xpbpl), col);  // 8
    } while (yp > xp);

    enddrawing();
}

//
// qsetmodeany
//
void qsetmodeany(int32_t daxdim, int32_t daydim)
{
    if (daxdim < 640) daxdim = 640;
    if (daydim < 480) daydim = 480;

    if (qsetmode != ((daxdim<<16)|(daydim&0xffff)))
    {
        g_lastpalettesum = 0;
        if (setvideomode(daxdim, daydim, 8, fullscreen) < 0)
            return;

        xdim = xres;
        ydim = yres;

        initsmost();

        ydim16 = yres - STATUS2DSIZ2;
        halfxdim16 = xres >> 1;
        midydim16 = ydim16 >> 1; // scale(200,yres,480);

        begindrawing(); //{{{
        Bmemset((char *)frameplace, 0, yres*bytesperline);
        enddrawing();   //}}}
    }

    qsetmode = ((daxdim<<16)|(daydim&0xffff));
}


//
// clear2dscreen
//
void clear2dscreen(void)
{
    int32_t const clearsz = (ydim16 <= yres - STATUS2DSIZ2) ? yres - STATUS2DSIZ2 : yres;
    begindrawing();  //{{{
    Bmemset((char *)frameplace, 0, bytesperline*clearsz);
    enddrawing();   //}}}
}


////////// editor side view //////////

int32_t scalescreeny(int32_t sy) { return (m32_sideview) ? mulscale14(sy, m32_sidesin) : sy; }

// return screen coordinates for BUILD coords x and y (relative to current position)
void screencoords(int32_t *xres, int32_t *yres, int32_t x, int32_t y, int32_t zoome)
{
    vec2_t coord = { x, y };

    if (m32_sideview)
        rotatepoint(zerovec, coord, m32_sideang, &coord);

    *xres = mulscale14(coord.x, zoome);
    *yres = scalescreeny(mulscale14(coord.y, zoome));
}

#if 0
void invscreencoords(int32_t *dx, int32_t *dy, int32_t sx, int32_t sy, int32_t zoome)
{
    if (m32_sidesin==0 || zoome==0) { *dx=0; *dy=0; return; }

    sy = divscale14(divscale14(sy, m32_sidesin), zoome);
    sx = divscale14(sx, zoome);

    rotatepoint(0,0, sx,sy, -m32_sideang, dx,dy);
}
#endif

// invscreencoords with sx==0 and sy==getscreenvdisp(dz, zoom)
int32_t getinvdisplacement(int32_t *dx, int32_t *dy, int32_t dz)
{
    if (m32_sidesin==0)
        return 1;

    dz = (((int64_t)dz * (int64_t)m32_sidecos)/(int64_t)m32_sidesin)>>4;

    vec2_t v[2] = { { 0, dz }, { *dx, *dy } };

    rotatepoint(zerovec, v[0], -m32_sideang, &v[1]);

    *dx = v[1].x;
    *dy = v[1].y;

    return 0;
}

// return vertical screen coordinate displacement for BUILD z coord
int32_t getscreenvdisp(int32_t bz, int32_t zoome)
{
    return mulscale32(bz,zoome*m32_sidecos);
}

void setup_sideview_sincos(void)
{
    if (m32_sideview)
    {
        m32_viewplane.x = 0;
        m32_viewplane.y = -512;

        m32_sidesin = sintable[m32_sideelev&2047];
        m32_sidecos = sintable[(m32_sideelev+512)&2047];

        rotatepoint(zerovec, *(vec2_t *)&m32_viewplane, -m32_sideang, (vec2_t *)&m32_viewplane);
        m32_viewplane.x = mulscale14(m32_viewplane.x, m32_sidecos);
        m32_viewplane.y = mulscale14(m32_viewplane.y, m32_sidecos);
        m32_viewplane.z = m32_sidesin>>5;
    }
}

static void sideview_getdist(int16_t sw, int16_t sect)
{
    vec3_t *p;
    vec3_t v;

    if (sw<MAXWALLS)
    {
        v.x = (wall[sw].x + wall[wall[sw].point2].x)>>1;
        v.y = (wall[sw].y + wall[wall[sw].point2].y)>>1;
        v.z = getflorzofslope(sect, v.x, v.y);
        p = &v;
    }
    else
        p = (vec3_t *)&sprite[sw-MAXWALLS];

    m32_sidedist[sw] = p->x*m32_viewplane.x + p->y*m32_viewplane.y + (p->z>>4)*m32_viewplane.z;
}

static int sideview_cmppoints(const void *sw1, const void *sw2)
{
    int32_t dist1 = m32_sidedist[B_UNBUF16(sw1)];
    int32_t dist2 = m32_sidedist[B_UNBUF16(sw2)];

    if (dist2>dist1)
        return 1;
    else if (dist1>dist2)
        return -1;

//    if (*sw1<MAXWALLS && *sw2<MAXWALLS)
//        return (wall[*sw2].nextwall>=0) - (wall[*sw1].nextwall>=0);

    return 0;
}

//
// draw2dgrid
//
void draw2dgrid(int32_t posxe, int32_t posye, int32_t posze, int16_t cursectnum, int16_t ange, int32_t zoome, int16_t gride)
{
    int64_t i, xp1, yp1, xp2=0, yp2, tempy;

    UNREFERENCED_PARAMETER(ange);

    if (gride <= 0)
        return;

    begindrawing();	//{{{

    if (m32_sideview)
    {
        int32_t sx1,sy1, sx2,sy2, dx=0,dy=0;
        int32_t xinc=0, yinc=2048>>gride, yofs;

//        yofs = getscreenvdisp((yinc-posze)&((yinc<<4)-1), zoome);
        if (cursectnum<0 || cursectnum>=numsectors)
            yofs = getscreenvdisp(-posze, zoome);
        else
            yofs = getscreenvdisp(getflorzofslope(cursectnum, posxe,posye)-posze, zoome);

        while (scalescreeny(mulscale14(yinc, zoome))==0 && gride>2)
        {
            gride--;
            yinc = 2048>>gride;
        }

        xp2 = xp1 = ((posxe+(1024>>gride))&(((int64_t)(-1))<<(11-gride)));
        yp2 = yp1 = ((posye+(1024>>gride))&(((int64_t)(-1))<<(11-gride)));

        do
        {
            if (xinc==0)
            {
                screencoords(&sx1,&sy1, -editorgridextent-posxe,yp2-posye, zoome);
                if (yp2 == yp1)
                {
                    screencoords(&sx2,&sy2, editorgridextent-posxe,yp2-posye, zoome);
                    dx = sx2-sx1;
                    dy = sy2-sy1;
                }
                yp2 += yinc;
            }
            else  // if (yinc==0)
            {
                screencoords(&sx1,&sy1, xp2-posxe, -editorgridextent-posye, zoome);
                if (xp2 == xp1)
                {
                    screencoords(&sx2,&sy2, xp2-posxe, editorgridextent-posye, zoome);
                    dx = sx2-sx1;
                    dy = sy2-sy1;
                }
                xp2 += xinc;
            }

            i = drawline16(halfxdim16+sx1,midydim16+sy1+yofs, halfxdim16+sx1+dx,midydim16+sy1+dy+yofs, editorcolors[25]);
            if (i==0 || (xp2<-editorgridextent || xp2>editorgridextent ||
                         yp2<-editorgridextent || yp2>editorgridextent))
            {
                xp2 = xp1;
                yp2 = yp1;

                i = 1;

                if (yinc>0)
                    yinc *= -1;
                else if (yinc<0)
                {
                    xinc = -yinc;
                    yinc = 0;
                }
                else if (xinc>0)
                    xinc *= -1;
                else // if (xinc<0)
                    i = 0;
            }
        }
        while (i);
    }
    else
    {
        // vertical lines
        yp1 = midydim16-mulscale14(posye+editorgridextent,zoome);
        if (yp1 < 0) yp1 = 0;

        yp2 = midydim16-mulscale14(posye-editorgridextent,zoome);
        if (yp2 >= ydim16) yp2 = ydim16-1;

        if ((yp1 < ydim16) && (yp2 >= 0) && (yp2 >= yp1))
        {
            xp1 = halfxdim16-mulscale14(posxe+editorgridextent,zoome);

            for (i=-editorgridextent; i<=editorgridextent; i+=(2048>>gride))
            {
                xp2 = xp1;
                xp1 = halfxdim16-mulscale14(posxe-i,zoome);

                if (xp1 >= xdim)
                    break;

                if (xp1 >= 0)
                {
                    if (xp1 != xp2)
                        drawline16(xp1,yp1,xp1,yp2,editorcolors[25]);
                }
            }
            if (i >= editorgridextent && xp1 < xdim)
                xp2 = xp1;
            if (xp2 >= 0 && xp2 < xdim)
                drawline16(xp2,yp1, xp2,yp2, editorcolors[25]);
        }

        // horizontal lines
        xp1 = mulscale14(posxe+editorgridextent,zoome);
        xp2 = mulscale14(posxe-editorgridextent,zoome);
        tempy = 0x80000000l;

        for (i=-editorgridextent; i<=editorgridextent; i+=(2048>>gride))
        {
            yp1 = ((posye-i)*zoome)>>14;
            if (yp1 != tempy)
            {
                if ((yp1 > midydim16-ydim16) && (yp1 <= midydim16))
                {
                    drawline16mid(-xp1,-yp1, -xp2,-yp1, editorcolors[25]);
                    tempy = yp1;
                }
            }
        }
    }

    enddrawing();   //}}}
}


static void drawscreen_drawwall(int32_t i, int32_t posxe, int32_t posye, int32_t posze, int32_t zoome, int32_t grayp)
{
    const walltype *const wal = &wall[i];

    int32_t j = wal->nextwall;
#if 0
    if (editstatus == 0)
    {
        if ((show2dwall[i>>3]&pow2char[i&7]) == 0) return;
        if ((j >= 0) && (i > j))
            if ((show2dwall[j>>3]&pow2char[j&7]) > 0) return;
    }
    else
#endif
    {
        if (!m32_sideview && !(grayp&2) && (j >= 0) && (i > j)) return;
    }

    char col;

    if (grayp&1)
        col = editorcolors[8];
    else if (j < 0)
        col = (i == linehighlight) ? editorcolors[15] - M32_THROB : editorcolors[15];
    else
    {
        if ((unsigned)wal->nextwall < MAXWALLS && ((wal->cstat^wall[j].cstat)&1))
            col = editorcolors[2];
        else if ((wal->cstat&1) != 0)
            col = editorcolors[5];
        else col = editorcolors[4];

        if (i == linehighlight || (linehighlight >= 0 && i == wall[linehighlight].nextwall))
            col += M32_THROB>>2;
    }

    int const p2 = wal->point2;

    int32_t x1, y1, x2, y2;
    screencoords(&x1,&y1, wal->x-posxe,wal->y-posye, zoome);
    screencoords(&x2,&y2, wall[p2].x-posxe,wall[p2].y-posye, zoome);

    int64_t const dx = wal->x-wall[p2].x;
    int64_t const dy = wal->y-wall[p2].y;
    int64_t const dist = dx*dx + dy*dy;

    int const bothSidesHighlighted = ((show2dwall[i>>3]&pow2char[i&7]) && (show2dwall[p2>>3]&pow2char[p2&7]));

    if (dist > INT32_MAX)
    {
        col=editorcolors[9];
        if (i == linehighlight || (linehighlight >= 0 && i == wall[linehighlight].nextwall))
            col -= M32_THROB>>3;
    }
    else if ((showfirstwall && searchsector>=0 && (sector[searchsector].wallptr == i ||
                                                   sector[searchsector].wallptr == wal->nextwall)) ||
             bothSidesHighlighted)
    {
        col = editorcolors[14];
        if (i == linehighlight || (linehighlight >= 0 && i == wall[linehighlight].nextwall) || bothSidesHighlighted)
            col -= M32_THROB>>1;
    }
    else if (circlewall >= 0 && (i == circlewall || wal->nextwall == circlewall))
        col = editorcolors[14];

    int32_t fz=0, fzn=0;

    if (m32_sideview)
    {
        // draw vertical line to neighboring wall
        int32_t const sect = sectorofwall(i);

        fz = getflorzofslope(sect, wal->x,wal->y);
        int32_t fz2 = getflorzofslope(sect, wall[p2].x, wall[p2].y);

        int32_t const dz = getscreenvdisp(fz-posze,zoome);
        int32_t const dz2 = getscreenvdisp(fz2-posze,zoome);

        y1 += dz;
        y2 += dz2;

        if (wal->nextwall>=0)
        {
            fzn = getflorzofslope(wal->nextsector, wal->x,wal->y);
//            if (i < wall[j].point2)
                drawline16mid(x1,y1, x1,y1+getscreenvdisp(fzn-fz,zoome), col);
        }
#ifdef YAX_ENABLE
        {
            int16_t const nw = yax_getnextwall(i, YAX_CEILING);

            if (nw >= 0)
            {
                int32_t const odrawlinepat = drawlinepat;
                fz2 = getflorzofslope(sectorofwall(nw), wall[nw].x,wall[nw].y);
                drawlinepat = 0x11111111;
                drawline16mid(x1,y1, x1,y1+getscreenvdisp(fz2-fz,zoome), col);
                drawlinepat = odrawlinepat;
            }
        }
#endif

        m32_wallscreenxy[i][0] = halfxdim16+x1;
        m32_wallscreenxy[i][1] = midydim16+y1;
    }

    if (wal->cstat&64)  // if hitscan bit set
    {
        int32_t const one=(klabs(x2-x1) >= klabs(y2-y1)), no=!one;

        drawline16mid(x1+no,y1+one, x2+no,y2+one, col);
        drawline16mid(x1-no,y1-one, x2-no,y2-one, col);
    }

    drawline16mid(x1,y1, x2,y2, col);

    // Draw height indicators at center of walls if requested and if not in
    // side-view mode.
    // XXX: This does not take sloping into account.
    if (showheightindicators && !m32_sideview)
    {
        int32_t dax,day;
        int32_t const k = getangle(x1-x2, y1-y2);

        screencoords(&dax,&day,
                     ((wal->x+wall[wal->point2].x)>>1)-posxe,
                     ((wal->y+wall[wal->point2].y)>>1)-posye, zoome);

        if (wal->nextsector >= 0)
        {
            int32_t const z1 = sector[sectorofwall(i)].floorz;
            int32_t const z2 = sector[wal->nextsector].floorz;

            if (z1 != z2 || showheightindicators == 2)
            {
                // Red walls. Show them on equal-height walls ONLY with setting 2.
                int32_t const bb = (z2 < z1);
                int32_t const dx = mulscale11(sintable[(k+1024 + 1024*bb)&2047],min(4096, zoome)) / 2560;
                int32_t const dy = scalescreeny(mulscale11(sintable[(k+512 + 1024*bb)&2047], min(4096, zoome)) / 2560);

                drawline16mid(dax,day, dax+dx,day+dy, col);
            }
        }
        else if (showheightindicators == 2)
        {
            // Show them on white walls ONLY with setting 2.
            int32_t const dx = mulscale11(sintable[(k+2048)&2047],min(4096, zoome)) / 2560;
            int32_t const dy = scalescreeny(mulscale11(sintable[(k+1536)&2047], min(4096, zoome)) / 2560);

            drawline16mid(dax,day, dax+dx,day+dy, col);
        }
    }

    if ((zoome >= 256 && editstatus == 1) || show2dwall[i>>3]&pow2char[i&7])
        if ((halfxdim16+x1 >= 2) && (halfxdim16+x1 <= xdim-3) &&
                (midydim16+y1 >= 2) && (midydim16+y1 <= ydim16-3))
        {
            int32_t pointsize = 2;

            col = editorcolors[15];

            if (i == pointhighlight || ((unsigned)pointhighlight < MAXWALLS &&
                                        (wal->x == wall[pointhighlight].x) && (wal->y == wall[pointhighlight].y)))
            {
                col = editorcolors[15] - (M32_THROB>>1);

                if (totalclock & 16)
                    pointsize++;
            }
            
            if (show2dwall[i>>3]&pow2char[i&7])
                col = editorcolors[14] - (M32_THROB>>1);

            if (m32_sideview)
            {
                if (wal->nextwall >= 0)
                {
                    if (fz < fzn)
                        col = editorcolors[7];
                    else if (fz == fzn)
                        col = editorcolors[4];
                }
            }

            drawcircle16(halfxdim16+x1, midydim16+y1, pointsize, 16384, col);
        }
}

int32_t getspritecol(int32_t spr)
{
    int const picnum = sprite[spr].picnum;
    int pal = sprite[spr].pal;
    int const tilecol = tilecols[picnum];

    if (palookup[pal] == NULL || (tilecol && palookup[pal][tilecol] == 0))
        pal = 0;

    if (tilecol) return palookup[pal][tilecol];

    if (!waloff[picnum]) loadtile(picnum);
    if (!waloff[picnum]) return editorcolors[3];

    // Calculate 2D mode tile color.

    uint32_t cols[256];

    Bmemset(cols, 0, sizeof(cols));

    const uint8_t *const texbuf = (const uint8_t *)waloff[picnum];

    for (int i = 0; i < tilesiz[picnum].x * tilesiz[picnum].y; i++)
        cols[texbuf[i]]++;

    unsigned col = 0, cnt = 0;

    for (int i = 0; i < 240; i++)
        if (cols[i] > cnt)
            col = i, cnt = cols[i];

    while (col < 240 && curpalette[col+1].r > curpalette[col].r)
        col++;

    tilecols[picnum] = col - 4;

    return palookup[pal][tilecols[picnum]];
}

static void drawscreen_drawsprite(int32_t j, int32_t posxe, int32_t posye, int32_t posze, int32_t zoome)
{
    int32_t x1, y1, x2, y2;
    int col;

    const spritetype *const spr = &sprite[j];
    int16_t const blocking = (spr->cstat&1), hitblocking = (spr->cstat&256);
    int16_t const flooraligned = (spr->cstat&32), wallaligned = (spr->cstat&16);

    int16_t const angofs = m32_sideview ? m32_sideang : 0;

    // KEEPINSYNC build.c: drawspritelabel()
    if (spr->sectnum<0)
        col = editorcolors[4];  // red
    else
    {
        uint8_t const spritecol = spritecol2d[spr->picnum][0];

        if (spritecol)
            col = editorcolors[blocking ? spritecol2d[spr->picnum][1] : spritecol];
        else
            col = getspritecol(j);
    }

    if (editstatus == 1)
    {
        if (pointhighlight >= 16384 &&
            (j+16384 == pointhighlight ||
             (!m32_sideview && (spr->x == sprite[pointhighlight-16384].x &&
                                spr->y == sprite[pointhighlight-16384].y))))
        {
            col += M32_THROB>>2;
        }
        else // if (highlightcnt > 0)
        {
            if (show2dsprite[j>>3]&pow2char[j&7])
                col = editorcolors[14] - (M32_THROB>>1);
        }
    }

    screencoords(&x1,&y1, spr->x-posxe,spr->y-posye, zoome);
//   tempint = ((midydim16+y1)*bytesperline)+(halfxdim16+x1)+frameplace;

    if (m32_sideview)
        y1 += getscreenvdisp(spr->z-posze,zoome);

    int f = mulscale12(128, zoome);

    if ((halfxdim16+x1 >= -f) && (halfxdim16+x1 < xdim+f) &&
            (midydim16+y1 >= -f) && (midydim16+y1 < ydim16+f))
    {
        if (zoome > 512 && spr->clipdist > 32)
            drawcircle16(halfxdim16+x1, midydim16+y1, mulscale14(spr->clipdist<<2, zoome), 16384, col);

        drawcircle16(halfxdim16+x1, midydim16+y1, 4, 16384, col);

        x2 = mulscale11(sintable[(spr->ang+angofs+2560)&2047],zoome) / 768;
        y2 = mulscale11(sintable[(spr->ang+angofs+2048)&2047],zoome) / 768;
        y2 = scalescreeny(y2);

        drawline16mid(x1,y1, x1+x2,y1+y2, col);

        if (hitblocking)
        {
            drawline16mid(x1,y1+1, x1+x2,y1+y2+1, col);
            drawline16mid(x1,y1-1, x1+x2,y1+y2-1, col);
            drawline16mid(x1-1,y1, x1+x2-1,y1+y2, col);
            drawline16mid(x1+1,y1, x1+x2+1,y1+y2, col);
        }

        if (flooraligned)
        {
            int32_t fx = mulscale10(mulscale6(tilesiz[spr->picnum].x, spr->xrepeat),zoome) >> 1;
            int32_t fy = mulscale10(mulscale6(tilesiz[spr->picnum].y, spr->yrepeat),zoome) >> 1;
            int32_t co[4][2], ii, in;
            int32_t sinang = sintable[(spr->ang+angofs+1536)&2047];
            int32_t cosang = sintable[(spr->ang+angofs+1024)&2047];
            int32_t r,s;

            co[0][0] = co[3][0] = -fx;
            co[0][1] = co[1][1] = -fy;
            co[1][0] = co[2][0] = fx;
            co[2][1] = co[3][1] = fy;

            for (ii=3; ii>=0; ii--)
            {
                r = mulscale14(cosang,co[ii][0]) - mulscale14(sinang,co[ii][1]);
                s = mulscale14(sinang,co[ii][0]) + mulscale14(cosang,co[ii][1]);
                s = scalescreeny(s);
                co[ii][0] = r;
                co[ii][1] = s;
            }
            drawlinepat = 0xcfcfcfcf;
            for (ii=3; ii>=0; ii--)
            {
                in = (ii+1)&3;
                drawline16mid(x1+co[ii][0], y1-co[ii][1], x1+co[in][0], y1-co[in][1], col);
                if (hitblocking)
                {
                    drawline16mid(x1+co[ii][0], y1-co[ii][1]+1, x1+co[in][0], y1-co[in][1]+1, col);
                    drawline16mid(x1+co[ii][0], y1-co[ii][1]-1, x1+co[in][0], y1-co[in][1]-1, col);
                    drawline16mid(x1+co[ii][0]+1, y1-co[ii][1], x1+co[in][0]+1, y1-co[in][1], col);
                    drawline16mid(x1+co[ii][0]-1, y1-co[ii][1], x1+co[in][0]-1, y1-co[in][1], col);
                }
                drawline16mid(x1, y1,  x1 + co[in][0], y1 - co[in][1],  col);
            }
            drawlinepat = 0xffffffff;
        }
        else if (wallaligned)
        {
            int32_t fx = mulscale6(tilesiz[spr->picnum].x, spr->xrepeat);
            int32_t one=(((spr->ang+angofs+256)&512) == 0), no=!one;

            x2 = mulscale11(sintable[(spr->ang+angofs+2560)&2047],zoome) / 6144;
            y2 = mulscale11(sintable[(spr->ang+angofs+2048)&2047],zoome) / 6144;
            y2 = scalescreeny(y2);

            drawline16mid(x1,y1, x1+x2,y1+y2, col);
            if (!(spr->cstat&64))  // not 1-sided
            {
                drawline16mid(x1,y1, x1-x2,y1-y2, col);
                if (hitblocking)
                {
                    drawline16mid(x1-no,y1-one, x1-x2-no,y1-y2-one, col);
                    drawline16mid(x1+no,y1+one, x1-x2+no,y1-y2+one, col);
                }
            }

            if (hitblocking)
            {
                drawline16mid(x1-no,y1-one, x1+x2-no,y1+y2-one, col);
                drawline16mid(x1+no,y1+one, x1+x2+no,y1+y2+one, col);
            }


            x2 = mulscale13(sintable[(spr->ang+angofs+1024)&2047],zoome) * fx / 4096;
            y2 = mulscale13(sintable[(spr->ang+angofs+512)&2047],zoome) * fx / 4096;
            y2 = scalescreeny(y2);

            drawline16mid(x1,y1, x1-x2,y1-y2, col);
            drawline16mid(x1,y1, x1+x2,y1+y2, col);

            if (hitblocking)
            {
                drawline16mid(x1+1,y1, x1+x2+1,y1+y2, col);
                drawline16mid(x1-1,y1, x1-x2-1,y1-y2, col);
                drawline16mid(x1-1,y1, x1+x2-1,y1+y2, col);
                drawline16mid(x1+1,y1, x1-x2+1,y1-y2, col);

                drawline16mid(x1,y1-1, x1+x2,y1+y2-1, col);
                drawline16mid(x1,y1+1, x1-x2,y1-y2+1, col);
                drawline16mid(x1,y1+1, x1+x2,y1+y2+1, col);
                drawline16mid(x1,y1-1, x1-x2,y1-y2-1, col);
            }
        }
    }
}

//
// draw2dscreen
//
void draw2dscreen(const vec3_t *pos, int16_t cursectnum, int16_t ange, int32_t zoome, int16_t gride)
{
    int32_t i, x1, y1;
    int16_t angofs = m32_sideview ? m32_sideang : 0;

    int32_t posxe=pos->x, posye=pos->y, posze=pos->z;
    uint8_t *graybitmap = (uint8_t *)tempbuf;
    int32_t alwaysshowgray = get_alwaysshowgray();

    if (in3dmode()) return;

    setup_sideview_sincos();

    begindrawing(); //{{{


    if (editstatus == 0)
    {
//        faketimerhandler();
        clear2dscreen();

//        faketimerhandler();
        draw2dgrid(posxe,posye,posze,cursectnum,ange,zoome,gride);
    }

    faketimerhandler();

    m32_swcnt = 0;

    if (numgraysects==0)
        Bmemset(graybitmap, 0, (numwalls+7)>>3);
    else
    {
        for (i=0; i<numwalls; i++)
        {
            int32_t j = wall[i].nextwall;
            if ((graywallbitmap[i>>3]&(1<<(i&7))) && (j < 0 || (graywallbitmap[j>>3]&(1<<(j&7)))))
                graybitmap[i>>3] |= (1<<(i&7));
            else
                graybitmap[i>>3] &= ~(1<<(i&7));
        }
    }

    if (!m32_sideview)
    {
#ifndef YAX_ENABLE
        for (i=numwalls-1; i>=0; i--)
            drawscreen_drawwall(i,posxe,posye,posze,zoome, 0);
#else
        if (alwaysshowgray)
            for (i=numwalls-1; i>=0; i--)
                if (graybitmap[i>>3]&(1<<(i&7)))
                    drawscreen_drawwall(i,posxe,posye,posze,zoome, 1+2);

        for (i=numwalls-1; i>=0; i--)
            if ((graybitmap[i>>3]&(1<<(i&7)))==0)
                drawscreen_drawwall(i,posxe,posye,posze,zoome, 2);
#endif
    }
    else
    {
        int32_t j = 0;

        for (i=0; i<numsectors; i++)
            for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
            {
                m32_wallsprite[m32_swcnt++] = j;
                sideview_getdist(j, i);
            }

        // j = sector[numsectors-1].wallptr + sector[numsectors-1].wallnum
        for (; j < numwalls; j++)  // new walls ...
        {
            m32_wallsprite[m32_swcnt++] = j;
            sideview_getdist(j, 0);
        }
    }

    faketimerhandler();

    if (zoome >= 256 || highlightcnt>0)
        for (int32_t j=0; j<MAXSPRITES; j++)
            if (sprite[j].statnum<MAXSTATUS)
            {
                // if sprite is highlighted, always draw it
                if ((show2dsprite[j>>3]&pow2char[j&7])==0)
                {
                    if (!m32_sideview && sprite[j].sectnum >= 0)
                        YAX_SKIPSECTOR(sprite[j].sectnum);

                    if (zoome<256)
                        continue;
                }

                if (!m32_sideview)
                    drawscreen_drawsprite(j,posxe,posye,posze,zoome);
                else
                {
                    m32_wallsprite[m32_swcnt++] = MAXWALLS+j;
                    sideview_getdist(MAXWALLS+j, -1);
                }
            }

    faketimerhandler();

    if (m32_sideview)
    {
        qsort(m32_wallsprite, m32_swcnt, sizeof(int16_t), &sideview_cmppoints);

        for (i=0; i<m32_swcnt; i++)  // shouldn't it go the other way around?
        {
            int32_t j = m32_wallsprite[i];
            if (j<MAXWALLS)
            {
                if (alwaysshowgray || !(graybitmap[j>>3]&(1<<(j&7))))
                    drawscreen_drawwall(j,posxe,posye,posze,zoome,!!(graybitmap[j>>3]&(1<<(j&7))));
            }
            else
            {
                if (!alwaysshowgray && sprite[j-MAXWALLS].sectnum>=0)
                    YAX_SKIPSECTOR(sprite[j-MAXWALLS].sectnum);

                drawscreen_drawsprite(j-MAXWALLS,posxe,posye,posze,zoome);
            }
        }

        faketimerhandler();
    }

#if 0
    {
        int32_t xx,yy,xx2,yy2;
        screencoords(&xx,&yy, -posxe,-posye, zoome);
        screencoords(&xx2,&yy2, (m32_viewplane.x)-posxe,(m32_viewplane.y)-posye, zoome);
        if (m32_sideview)
            yy2 += getscreenvdisp((m32_viewplane.z<<4)-posze, zoome);

        drawcircle16(halfxdim16+xx, midydim16+yy, 2, 16384, editorcolors[4]); //red
        drawcircle16(halfxdim16+xx2, midydim16+yy2, 2, 16384, editorcolors[14]); //yellow
        drawline16mid(xx,yy, xx2,yy2, editorcolors[15]);
    }
#endif

    x1 = mulscale11(sintable[(ange+angofs+2560)&2047],zoome) / 768; //Draw white arrow
    y1 = mulscale11(sintable[(ange+angofs+2048)&2047],zoome) / 768;

    i = scalescreeny(x1);
    int32_t j = scalescreeny(y1);

    drawline16mid(x1,j, -x1,-j, editorcolors[15]);
    drawline16mid(x1,j, +y1,-i, editorcolors[15]);
    drawline16mid(x1,j, -y1,+i, editorcolors[15]);


    enddrawing();   //}}}
}


static int32_t printext_checkypos(int32_t ypos, int32_t *yminptr, int32_t *ymaxptr)
{
    int32_t ymin=0, ymax=7;

    if (ypos < 0)
    {
/*
        ymin = 0-ypos;
        if (ymin > 7)
            return 1;
*/
    }
    else if (ypos+7 >= ydim)
    {
        ymax = ydim-ypos-1;
        if (ymax < 0)
            return 1;
    }

    *yminptr = ymin;
    *ymaxptr = ymax;

    return 0;
}

//
// printext16
//
int32_t printext16(int32_t xpos, int32_t ypos, int16_t col, int16_t backcol, const char *name, char fontsize)
{
    int32_t ymin, ymax;

    if (printext_checkypos(ypos, &ymin, &ymax))
        return 0;

    if (fontsize & 2) printext16(xpos+1, ypos+1, 0, -1, name, (fontsize & ~2) | 4);

    int32_t const ocol = col, obackcol = backcol;
    char smallbuf[4];

    int32_t stx = xpos;
    const int32_t xpos0 = xpos;

    char const * const fontptr = (fontsize & 1) ? smalltextfont : textfont;
    int const charxsiz = 8 - ((fontsize & 1)<<2);

    for (int i=0; name[i]; i++)
    {
        if (name[i] == '^')
        {
            i++;
            if (name[i] == 'O') // ^O resets formatting
            {
                if (fontsize & 4) continue;

                col = ocol;
                backcol = obackcol;
                continue;
            }
            if (isdigit(name[i]))
            {
                if (isdigit(name[i+1]))
                {
                    if (isdigit(name[i+2]))
                    {
                        Bmemcpy(&smallbuf[0],&name[i],3);
                        i += 2;
                        smallbuf[3] = '\0';
                    }
                    else
                    {
                        Bmemcpy(&smallbuf[0],&name[i],2);
                        i++;
                        smallbuf[2] = '\0';
                    }
                }
                else
                {
                    smallbuf[0] = name[i];
                    smallbuf[1] = '\0';
                }
                if (!(fontsize & 4))
                    col = editorcolors[Batol(smallbuf)];

                if (name[i+1] == ',' && isdigit(name[i+2]))
                {
                    i+=2;
                    if (isdigit(name[i+1]))
                    {
                        if (isdigit(name[i+2]))
                        {
                            Bmemcpy(&smallbuf[0],&name[i],3);
                            i += 2;
                            smallbuf[3] = '\0';
                        }
                        else
                        {
                            Bmemcpy(&smallbuf[0],&name[i],2);
                            i++;
                            smallbuf[2] = '\0';
                        }
                    }
                    else
                    {
                        smallbuf[0] = name[i];
                        smallbuf[1] = '\0';
                    }

                    if (!(fontsize & 4))
                        backcol = editorcolors[Batol(smallbuf)];
                }
                continue;
            }
        }

        if (name[i] == '\n')
        {
            xpos = stx = xpos0;
            ypos += 8;
            if (printext_checkypos(ypos, &ymin, &ymax))
                return 0;
            continue;
        }

        if (stx<0)
        {
            stx += charxsiz;
            continue;
        }

        char const * const letptr = &fontptr[name[i]<<3];

        begindrawing(); //{{{
        char *ptr = (char *)(bytesperline*ypos + (stx-(fontsize&1)) + frameplace);
        int const trans = (obackcol < -1);

        if (trans && backcol < 0)
            backcol = -backcol;

        if (backcol >= 0)
        {
            for (int y=ymin; y<=ymax; y++)
            {
                for (int x=0; x<charxsiz; x++)
                {
                    if ((unsigned) (stx+x) >= (unsigned)xdim || ptr < (char *) frameplace) break;
                    ptr[x] = (letptr[y] & pow2char[7 - (fontsize & 1) - x]) ?
                             (uint8_t)col :
                             trans ? (uint8_t)blendtable[0][(ptr[x] * 256) + backcol] : backcol;
                }
                ptr += bytesperline;
            }
        }
        else
        {
            for (int y=ymin; y<=ymax; y++)
            {
                for (int x=0; x<charxsiz; x++)
                {
                    if ((unsigned) (stx+x) >= (unsigned)xdim || ptr < (char *) frameplace) break;
                    if (letptr[y]&pow2char[7-(fontsize&1)-x]) ptr[x] = (uint8_t) col;
                }
                ptr += bytesperline;
            }
        }
        enddrawing();   //}}}

        stx += charxsiz;

        if (stx >= xdim)
            break;
    }

    return stx;
}


//
// printext256
//
void printext256(int32_t xpos, int32_t ypos, int16_t col, int16_t backcol, const char *name, char fontsize)
{
    int32_t stx, i, x, y, charxsiz;
    char *fontptr, *letptr, *ptr;

    stx = xpos;

    if (fontsize) { fontptr = smalltextfont; charxsiz = 4; }
    else { fontptr = textfont; charxsiz = 8; }

#ifdef USE_OPENGL
    if (!polymost_printext256(xpos,ypos,col,backcol,name,fontsize)) return;
# if 0
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        int32_t xx, yy;
        int32_t lc=-1;
        palette_t p=getpal(col), b=getpal(backcol);

        setpolymost2dview();
        bglDisable(GL_ALPHA_TEST);
        bglDepthMask(GL_FALSE);	// disable writing to the z-buffer

        bglBegin(GL_POINTS);

        for (i=0; name[i]; i++)
        {
            // TODO: factor out!
            if (name[i] == '^' && isdigit(name[i+1]))
            {
                char smallbuf[8];
                int32_t bi=0;

                while (isdigit(name[i+1]) && bi<3)
                {
                    smallbuf[bi++]=name[i+1];
                    i++;
                }
                smallbuf[bi++]=0;
                if (col)
                    col = Batol(smallbuf);

                p = getpal(col);

                continue;
            }
            letptr = &fontptr[name[i]<<3];
            xx = stx-fontsize;
            yy = ypos+7 + 2; //+1 is hack!
            for (y=7; y>=0; y--)
            {
                for (x=charxsiz-1; x>=0; x--)
                {
                    if (letptr[y]&pow2char[7-fontsize-x])
                    {
                        if (lc!=col)
                            bglColor4ub(p.r,p.g,p.b,255);
                        lc = col;
                        bglVertex2i(xx+x,yy);
                    }
                    else if (backcol >= 0)
                    {
                        if (lc!=backcol)
                            bglColor4ub(b.r,b.g,b.b,255);
                        lc = backcol;
                        bglVertex2i(xx+x,yy);
                    }
                }
                yy--;
            }
            stx += charxsiz;
        }

        bglEnd();
        bglDepthMask(GL_TRUE);  // re-enable writing to the z-buffer

        return;
    }
# endif
#endif

    begindrawing(); //{{{
    for (i=0; name[i]; i++)
    {
        if (name[i] == '^' && isdigit(name[i+1]))
        {
            char smallbuf[8];
            int32_t bi=0;
            while (isdigit(name[i+1]) && bi<3)
            {
                smallbuf[bi++]=name[i+1];
                i++;
            }
            smallbuf[bi++]=0;
            if (col)col = Batol(smallbuf);
            continue;
        }

        if (stx-fontsize+charxsiz > xdim)
            break;

        letptr = &fontptr[name[i]<<3];
        ptr = (char *)(ylookup[ypos+7]+(stx-fontsize)+frameplace);
        for (y=7; y>=0; y--)
        {
            for (x=charxsiz-1; x>=0; x--)
            {
                if (letptr[y]&pow2char[7-fontsize-x])
                    ptr[x] = (uint8_t)col;
                else if (backcol >= 0)
                    ptr[x] = (uint8_t)backcol;
            }
            ptr -= ylookup[1];
        }
        stx += charxsiz;
    }
    enddrawing();   //}}}
}


//
// screencapture
//

static int32_t screencapture_common1(char *fn, const char *ext, BFILE** filptr)
{
    int32_t i;

    do      // JBF 2004022: So we don't overwrite existing screenshots
    {
        if (capturecount > 9999) return -1;

        i = Bstrrchr(fn,'.')-fn-4;
        fn[i++] = ((capturecount/1000)%10)+48;
        fn[i++] = ((capturecount/100)%10)+48;
        fn[i++] = ((capturecount/10)%10)+48;
        fn[i++] = (capturecount%10)+48;
        i++;
        Bstrcpy(&fn[i], ext);

        if ((*filptr = Bfopen(fn,"rb")) == NULL) break;
        Bfclose(*filptr);
        capturecount++;
    }
    while (1);

    *filptr = Bfopen(fn,"wb");
    if (*filptr == NULL)
        return -1;

    return 0;
}

#ifdef USE_LIBPNG
// PNG screenshots -- adapted from libpng example.c
static int32_t screencapture_png(const char *filename, char inverseit, const char *versionstr)
{
    int32_t i;
    BFILE *fp;
# ifdef USE_OPENGL
#  define HICOLOR (getrendermode() >= REND_POLYMOST && in3dmode())
# else
#  define HICOLOR 0
# endif
    png_structp png_ptr;
    png_infop info_ptr;
    png_colorp palette = NULL;
    png_textp text = NULL;

    png_bytep buf = NULL;
    png_bytepp rowptrs = NULL;

    char fn[32];  // careful...

    Bstrcpy(fn, filename);
    i = screencapture_common1(fn, "png", &fp);
    if (i)
        return i;

    /* Create and initialize the png_struct with default error handling. */
    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if (png_ptr == NULL)
    {
        Bfclose(fp);
        return -1;
    }

    /* Allocate/initialize the image information data. */
    info_ptr = png_create_info_struct(png_ptr);
    if (info_ptr == NULL)
    {
        Bfclose(fp);
        png_destroy_write_struct(&png_ptr, NULL);
        return -1;
    }

    /* Set error handling. */
    if (setjmp(png_jmpbuf(png_ptr)))
    {
        /* If we get here, we had a problem writing the file */
        Bfclose(fp);
        if (palette) png_free(png_ptr, palette);
        if (text) png_free(png_ptr, text);
        if (buf) png_free(png_ptr, buf);
        if (rowptrs) png_free(png_ptr, rowptrs);
        png_destroy_write_struct(&png_ptr, &info_ptr);

        return -1;
    }

    png_init_io(png_ptr, fp);

    // initialize various info fields from here on
    png_set_IHDR(png_ptr, info_ptr, xdim, ydim, 8,
                 HICOLOR ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_PALETTE,
                 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

    if (HICOLOR && editstatus==0)
        png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_VALUE_NONE);

    if (!HICOLOR)
	#if (PNG_LIBPNG_VER > 10599)
        palette = (png_colorp)png_malloc(png_ptr, 256*sizeof(png_color));
	#else
        palette = (png_colorp)png_malloc(png_ptr, 256*png_sizeof(png_color));
	#endif

    if (palette)
    {
        for (i=0; i<256; i++)
        {
            palette[i].red = inverseit ? 255-curpalettefaded[i].r : curpalettefaded[i].r;
            palette[i].green = inverseit ? 255-curpalettefaded[i].g : curpalettefaded[i].g;
            palette[i].blue = inverseit ? 255-curpalettefaded[i].b : curpalettefaded[i].b;
        }

        png_set_PLTE(png_ptr, info_ptr, palette, 256);
    }

//    png_set_gAMA(png_ptr, info_ptr, vid_gamma);  // 1.0/vid_gamma ?
//    png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_SATURATION);  // hm...

    #if (PNG_LIBPNG_VER > 10599)
    text = (png_textp)png_malloc(png_ptr, 2*sizeof(png_text));
    #else
    text = (png_textp)png_malloc(png_ptr, 2*png_sizeof(png_text));
    #endif
    text[0].compression = PNG_TEXT_COMPRESSION_NONE;
    text[0].key = Bstrdup("Title");
    text[0].text = Bstrdup((editstatus ? "Mapster32 screenshot" : "EDuke32 screenshot"));

    text[1].compression = PNG_TEXT_COMPRESSION_NONE;
    text[1].key = Bstrdup("Software");
    text[1].text = Bstrdup(versionstr);
    png_set_text(png_ptr, info_ptr, text, 2);

    // get/set the pixel data
    begindrawing(); //{{{
    if (palette)
    {
        buf = (png_bytep)png_malloc(png_ptr, bytesperline*ydim);
        Bmemcpy(buf, (char *)frameplace, bytesperline*ydim);
    }
# ifdef USE_OPENGL
    else
    {
        buf = (png_bytep)png_malloc(png_ptr, xdim*ydim*3);
        bglReadPixels(0,0,xdim,ydim,GL_RGB,GL_UNSIGNED_BYTE,buf);
    }
# endif
    enddrawing(); //}}}

    rowptrs = (png_bytepp)png_malloc(png_ptr, ydim*sizeof(png_bytep));

    if (!palette)
    {
        for (i=0; i<ydim; i++)
            rowptrs[i] = &buf[3*xdim*(ydim-i-1)];
    }
    else
    {
        for (i=0; i<ydim; i++)
            rowptrs[i] = &buf[ylookup[i]];
    }
    png_set_rows(png_ptr, info_ptr, rowptrs);

    // write the png file!
    png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);

    Bfclose(fp);
    if (palette) png_free(png_ptr, palette);

    DO_FREE_AND_NULL(text[0].key);
    DO_FREE_AND_NULL(text[0].text);

    DO_FREE_AND_NULL(text[1].key);
    DO_FREE_AND_NULL(text[1].text);

    if (text) png_free(png_ptr, text);

    if (buf) png_free(png_ptr, buf);
    if (rowptrs) png_free(png_ptr, rowptrs);
    png_destroy_write_struct(&png_ptr, &info_ptr);

    OSD_Printf("Saved screenshot to %s\n", fn);
    capturecount++;
    return 0;
}
# undef HICOLOR

#else  // if !defined USE_LIBPNG

static int32_t screencapture_tga(const char *filename, char inverseit)
{
    int32_t i;
    char *ptr, head[18] = { 0,1,1,0,0,0,1,24,0,0,0,0,0/*wlo*/,0/*whi*/,0/*hlo*/,0/*hhi*/,8,0 };
    //char palette[4*256];
    char *fn = Xstrdup(filename);
# ifdef USE_OPENGL
    int32_t j;
    char *inversebuf;
# endif
    BFILE *fil;

    i = screencapture_common1(fn, "tga", &fil);
    if (i)
    {
        Bfree(fn);
        return i;
    }

# ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        head[1] = 0;    // no colourmap
        head[2] = 2;    // uncompressed truecolour
        head[3] = 0;    // (low) first colourmap index
        head[4] = 0;    // (high) first colourmap index
        head[5] = 0;    // (low) number colourmap entries
        head[6] = 0;    // (high) number colourmap entries
        head[7] = 0;    // colourmap entry size
        head[16] = 24;  // 24 bits per pixel
    }
# endif

    head[12] = xdim & 0xff;
    head[13] = (xdim >> 8) & 0xff;
    head[14] = ydim & 0xff;
    head[15] = (ydim >> 8) & 0xff;

    Bfwrite(head, 18, 1, fil);

    begindrawing(); //{{{
    ptr = (char *)frameplace;

    // palette first
# ifdef USE_OPENGL
    if (getrendermode() < REND_POLYMOST || (getrendermode() >= REND_POLYMOST && !in3dmode()))
# endif
    {
        //getpalette(0,256,palette);
        for (i=0; i<256; i++)
        {
            Bfputc(inverseit ? 255-curpalettefaded[i].b : curpalettefaded[i].b, fil);  // b
            Bfputc(inverseit ? 255-curpalettefaded[i].g : curpalettefaded[i].g, fil);  // g
            Bfputc(inverseit ? 255-curpalettefaded[i].r : curpalettefaded[i].r, fil);  // r
        }
    }

# ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        char c;
        // 24bit
        inversebuf = (char *)Xmalloc(xdim*ydim*3);

        bglReadPixels(0,0,xdim,ydim,GL_RGB,GL_UNSIGNED_BYTE,inversebuf);
        j = xdim*ydim*3;
        for (i=0; i<j; i+=3)
        {
            c = inversebuf[i];
            inversebuf[i] = inversebuf[i+2];
            inversebuf[i+2] = c;
        }
        Bfwrite(inversebuf, xdim*ydim, 3, fil);

        Bfree(inversebuf);
    }
    else
# endif
    {
        for (i=ydim-1; i>=0; i--)
            Bfwrite(ptr+i*bytesperline, xdim, 1, fil);
    }

    enddrawing();   //}}}

    Bfclose(fil);
    OSD_Printf("Saved screenshot to %s\n", fn);
    Bfree(fn);
    capturecount++;
    return(0);
}
# endif


int32_t screencapture(const char *filename, char inverseit, const char *versionstr)
{
#ifndef USE_LIBPNG
    UNREFERENCED_PARAMETER(versionstr);
    return screencapture_tga(filename,inverseit);
#else
    return screencapture_png(filename,inverseit,versionstr);
#endif
}


#ifdef POLYMER
static void PolymerProcessModels(void)
{
    // potentially deferred MD3 postprocessing
    for (int32_t i=0; i<nextmodelid; i++)
    {
        if (models[i]->mdnum==3 && ((md3model_t *)models[i])->head.surfs[0].geometry == NULL)
        {
            static int32_t warned=0;

            if (!warned)
            {
                OSD_Printf("Post-processing MD3 models for Polymer. This may take a while...\n");
                nextpage();
                warned = 1;
            }

            if (!md3postload_polymer((md3model_t *)models[i]))
                OSD_Printf("INTERNAL ERROR: mdmodel %s failed postprocessing!\n",
                           ((md3model_t *)models[i])->head.nam);

            if (((md3model_t *)models[i])->head.surfs[0].geometry == NULL)
                OSD_Printf("INTERNAL ERROR: wtf?\n");
        }
//        else
//            OSD_Printf("mdmodel %d already postprocessed.\n", i);
    }
}
#endif

//
// setrendermode
//
int32_t setrendermode(int32_t renderer)
{
    UNREFERENCED_PARAMETER(renderer);

#ifdef USE_OPENGL
    if (bpp == 8)
        renderer = REND_CLASSIC;
# ifdef POLYMER
    else
        renderer = clamp(renderer, REND_POLYMOST, REND_POLYMER);

    if (renderer == REND_POLYMER)
    {
        PolymerProcessModels();

        if (!polymer_init())
            renderer = REND_POLYMOST;
    }
    else if (getrendermode() == REND_POLYMER)  // going from Polymer to another renderer
    {
        delete_maphack_lights();
        G_Polymer_UnInit();
        polymer_uninit();
    }
# endif

    basepalreset = 1;

    rendmode = renderer;
    if (getrendermode() >= REND_POLYMOST)
        glrendmode = rendmode;
#endif

    return 0;
}

//
// setrollangle
//
#ifdef USE_OPENGL
void setrollangle(int32_t rolla)
{
    gtang = (float)rolla * ((float)PI * (1.f/1024.f));
}
#endif


//
// invalidatetile
//  pal: pass -1 to invalidate all palettes for the tile, or >=0 for a particular palette
//  how: pass -1 to invalidate all instances of the tile in texture memory, or a bitfield
//         bit 0: opaque or masked (non-translucent) texture, using repeating
//         bit 1: ignored
//         bit 2: ignored (33% translucence, using repeating)
//         bit 3: ignored (67% translucence, using repeating)
//         bit 4: opaque or masked (non-translucent) texture, using clamping
//         bit 5: ignored
//         bit 6: ignored (33% translucence, using clamping)
//         bit 7: ignored (67% translucence, using clamping)
//       clamping is for sprites, repeating is for walls
//
void invalidatetile(int16_t tilenume, int32_t pal, int32_t how)
{
#if !defined USE_OPENGL
    UNREFERENCED_PARAMETER(tilenume);
    UNREFERENCED_PARAMETER(pal);
    UNREFERENCED_PARAMETER(how);
#else
    if (getrendermode() >= REND_POLYMOST)
    {
        const int32_t firstpal = (pal < 0) ? 0 : pal;
        const int32_t numpals = (pal < 0) ? MAXPALOOKUPS : 1;

        for (int hp = 0; hp <= 4; hp+=4)
        {
            if (how & pow2long[hp])
                for (int np = firstpal; np < firstpal+numpals; np++)
                    gltexinvalidate(tilenume, np, hp);
        }

#ifdef POLYMER
        if (getrendermode() == REND_POLYMER)
            polymer_invalidateartmap(tilenume);
#endif
    }
#endif
}


//
// setpolymost2dview
//  Sets OpenGL for 2D drawing
//
void setpolymost2dview(void)
{
#ifdef USE_OPENGL
    if (getrendermode() < REND_POLYMOST) return;

    bglViewport(0,0,xres,yres);

    bglMatrixMode(GL_PROJECTION);
    bglLoadIdentity();
    bglOrtho(0,xres,yres,0,-1,1);

    if (getrendermode() == REND_POLYMER)
    {
        bglMatrixMode(GL_MODELVIEW);
        bglLoadIdentity();
    }

    gloy1 = -1;

    bglDisable(GL_DEPTH_TEST);
    bglDisable(GL_TEXTURE_2D);
    bglDisable(GL_BLEND);
#endif
}

void hash_init(hashtable_t *t)
{
    hash_free(t);
    t->items=(hashitem_t **)Xcalloc(1, t->size * sizeof(hashitem_t));
}

void hash_loop(hashtable_t *t, void (*func)(const char *, intptr_t))
{
    if (t->items == NULL)
        return;

    for (int32_t i=0; i < t->size; i++)
        for (hashitem_t *item=t->items[i]; item != NULL; item = item->next)
            func(item->string, item->key);
}

void hash_free(hashtable_t *t)
{
    if (t->items == NULL)
        return;

    int remaining = t->size - 1;

    do
    {
        hashitem_t *cur = t->items[remaining];

        int num = 0;

        while (cur)
        {
            hashitem_t * const tmp = cur;
            cur = cur->next;

            Bfree(tmp->string);
            Bfree(tmp);
            num++;
        }
    } while (--remaining >= 0);

    DO_FREE_AND_NULL(t->items);
}

// djb3 algorithm
static inline uint32_t hash_getcode(const char *s)
{
    uint32_t h = 5381;
    int32_t ch;

    while ((ch = *s++) != '\0')
        h = ((h << 5) + h) ^ ch;

    return h;
}

void hash_add(hashtable_t *t, const char *s, intptr_t key, int32_t replace)
{
    if (EDUKE32_PREDICT_FALSE(t->items == NULL))
    {
        initprintf("hash_add(): table not initialized!\n");
        return;
    }

    uint32_t code = hash_getcode(s) % t->size;
    hashitem_t *cur = t->items[code];

    if (!cur)
    {
        cur = (hashitem_t *)Xcalloc(1,sizeof(hashitem_t));
        cur->string = Xstrdup(s);
        cur->key = key;
        cur->next = NULL;
        t->items[code] = cur;
        return;
    }

    hashitem_t *prev = NULL;

    do
    {
        if (Bstrcmp(s,cur->string) == 0)
        {
            if (replace) cur->key = key;
            return;
        }
        prev = cur;
    }
    while ((cur = cur->next));

    cur = (hashitem_t *)Xcalloc(1,sizeof(hashitem_t));
    cur->string = Xstrdup(s);
    cur->key = key;
    cur->next = NULL;
    prev->next = cur;
}

// delete at most once
void hash_delete(hashtable_t *t, const char *s)
{
    if (t->items == NULL)
    {
        initprintf("hash_delete(): table not initialized!\n");
        return;
    }

    uint32_t code = hash_getcode(s) % t->size;
    hashitem_t *cur = t->items[code];

    if (!cur)
        return;

    hashitem_t *prev = NULL;

    do
    {
        if (Bstrcmp(s, cur->string) == 0)
        {
            Bfree(cur->string);

            if (!prev)
                t->items[code] = cur->next;
            else
                prev->next = cur->next;

            Bfree(cur);

            break;
        }
        prev = cur;
    }
    while ((cur = cur->next));
}

intptr_t hash_find(const hashtable_t * const t, char const * const s)
{
    if (t->items == NULL)
    {
        initprintf("hash_find(): table not initialized!\n");
        return -1;
    }

    hashitem_t *cur = t->items[hash_getcode(s) % t->size];

    if (!cur)
        return -1;

    do
        if (Bstrcmp(s, cur->string) == 0)
            return cur->key;
    while ((cur = cur->next));

    return -1;
}

intptr_t hash_findcase(const hashtable_t * const t, char const * const s)
{

    if (t->items == NULL)
    {
        initprintf("hash_findcase(): table not initialized!\n");
        return -1;
    }

    hashitem_t *cur = t->items[hash_getcode(s) % t->size];

    if (!cur)
        return -1;

    do
        if (Bstrcasecmp(s, cur->string) == 0)
            return cur->key;
    while ((cur = cur->next));

    return -1;
}


void inthash_init(inthashtable_t *t)
{
    if (EDUKE32_PREDICT_FALSE(!t->count))
    {
        initputs("inthash_add(): count is zero!\n");
        return;
    }

    inthash_free(t);

    t->items = (inthashitem_t *)Xcalloc(t->count, sizeof(inthashitem_t));
}

void inthash_loop(inthashtable_t const *t, void (*func)(intptr_t, intptr_t))
{
    if (EDUKE32_PREDICT_FALSE(t->items == NULL))
    {
        initputs("inthash_loop(): table not initialized!\n");
        return;
    }

    for (inthashitem_t const * item = t->items, * const items_end = t->items + t->count; item < items_end; ++item)
        func(item->key, item->value);
}

void inthash_free(inthashtable_t *t)
{
    DO_FREE_AND_NULL(t->items);
}

// djb3 algorithm
static inline uint32_t inthash_getcode(intptr_t key)
{
    uint32_t h = 5381;

    for (uint8_t const * keybuf = (uint8_t *)&key, * const keybuf_end = keybuf + sizeof(intptr_t); keybuf < keybuf_end; ++keybuf)
        h = ((h << 5) + h) ^ (uint32_t)*keybuf;

    return h;
}

void inthash_add(inthashtable_t *t, intptr_t key, intptr_t value, int32_t replace)
{
    if (EDUKE32_PREDICT_FALSE(t->items == NULL))
    {
        initputs("inthash_add(): table not initialized!\n");
        return;
    }

    inthashitem_t * seeker = t->items + inthash_getcode(key) % t->count;

    if (seeker->collision == NULL)
    {
        seeker->key = key;
        seeker->value = value;
        seeker->collision = seeker;

        return;
    }

    if (seeker->key == key)
    {
        if (replace)
            seeker->value = value;
        return;
    }

    while (seeker != seeker->collision)
    {
        seeker = seeker->collision;

        if (seeker->key == key)
        {
            if (replace)
                seeker->value = value;
            return;
        }
    }

    inthashitem_t *tail = seeker;

    do
        tail = t->items + (tail - t->items + 1) % t->count;
    while (tail->collision != NULL && tail != seeker);

    if (EDUKE32_PREDICT_FALSE(tail == seeker))
    {
        initputs("inthash_add(): table full!\n");
        return;
    }

    tail->key = key;
    tail->value = value;
    tail->collision = seeker->collision = tail;
}

// delete at most once
void inthash_delete(inthashtable_t *t, intptr_t key)
{
    if (EDUKE32_PREDICT_FALSE(t->items == NULL))
    {
        initputs("inthash_delete(): table not initialized!\n");
        return;
    }

    inthashitem_t * seeker = t->items + inthash_getcode(key) % t->count;

    if (seeker->collision == NULL)
        return;

    if (seeker->key == key)
    {
        seeker->collision = NULL;
        return;
    }

    while (seeker != seeker->collision)
    {
        inthashitem_t * const prev = seeker;
        seeker = seeker->collision;

        if (seeker->key == key)
        {
            prev->collision = seeker == seeker->collision ? prev : seeker->collision;
            seeker->collision = NULL;
            return;
        }
    }
}

intptr_t inthash_find(inthashtable_t const *t, intptr_t key)
{
    if (EDUKE32_PREDICT_FALSE(t->items == NULL))
    {
        initputs("inthash_find(): table not initialized!\n");
        return -1;
    }

    inthashitem_t const * seeker = t->items + inthash_getcode(key) % t->count;

    if (seeker->collision == NULL)
        return -1;

    if (seeker->key == key)
        return seeker->value;

    while (seeker != seeker->collision)
    {
        seeker = seeker->collision;

        if (seeker->key == key)
            return seeker->value;
    }

    return -1;
}

/*
 * vim:ts=8:
 */

