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ENGINE.C
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ENGINE.C
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// "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.
#define SUPERBUILD
#define ENGINE
#include <string.h>
#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <fcntl.h>
#include <io.h>
#include <sys\types.h>
#include <sys\stat.h>
#include <conio.h>
#include <i86.h>
#include "build.h"
#include "pragmas.h"
long stereowidth = 23040, stereopixelwidth = 28, ostereopixelwidth = -1;
volatile long stereomode = 0, visualpage, activepage, whiteband, blackband;
volatile char oa1, o3c2, ortca, ortcb, overtbits, laststereoint;
#include "ves2.h"
#pragma intrinsic(min);
#pragma intrinsic(max);
#define MAXCLIPNUM 512
#define MAXPERMS 512
#define MAXTILEFILES 256
#define MAXYSAVES ((MAXXDIM*MAXSPRITES)>>7)
#define MAXNODESPERLINE 42 //Warning: This depends on MAXYSAVES & MAXYDIM!
#define MAXWALLSB 2048
#define MAXCLIPDIST 1024
//MUST CALL MALLOC THIS WAY TO FORCE CALLS TO KMALLOC!
void *kmalloc(size_t size) { return(malloc(size)); }
void *kkmalloc(size_t size);
#pragma aux kkmalloc =\
"call kmalloc",\
parm [eax]\
//MUST CALL FREE THIS WAY TO FORCE CALLS TO KFREE!
void kfree(void *buffer) { free(buffer); }
void kkfree(void *buffer);
#pragma aux kkfree =\
"call kfree",\
parm [eax]\
#ifdef SUPERBUILD
//MUST CALL LOADVOXEL THIS WAY BECAUSE WATCOM STINKS!
void loadvoxel(long voxindex) { }
void kloadvoxel(long voxindex);
#pragma aux kloadvoxel =\
"call loadvoxel",\
parm [eax]\
//These variables need to be copied into BUILD
#define MAXXSIZ 128
#define MAXYSIZ 128
#define MAXZSIZ 200
#define MAXVOXELS 512
#define MAXVOXMIPS 5
long voxoff[MAXVOXELS][MAXVOXMIPS], voxlock[MAXVOXELS][MAXVOXMIPS];
static long ggxinc[MAXXSIZ+1], ggyinc[MAXXSIZ+1];
static long lowrecip[1024], nytooclose, nytoofar;
static unsigned long distrecip[16384];
#endif
static char moustat = 0;
long transarea = 0, totalarea = 0, beforedrawrooms = 1;
static long oxdimen = -1, oviewingrange = -1, oxyaspect = -1;
static long curbrightness = 0;
//Textured Map variables
static char globalpolytype;
static short *dotp1[MAXYDIM], *dotp2[MAXYDIM];
static unsigned char tempbuf[MAXWALLS];
long ebpbak, espbak;
long slopalookup[2048];
static char permanentlock = 255;
long artversion, mapversion;
char *pic = NULL;
char picsiz[MAXTILES], tilefilenum[MAXTILES];
long lastageclock;
long tilefileoffs[MAXTILES];
long artsize = 0, cachesize = 0;
static short radarang[1280], radarang2[MAXXDIM];
static unsigned short sqrtable[4096], shlookup[4096+256];
char pow2char[8] = {1,2,4,8,16,32,64,128};
long pow2long[32] =
{
1L,2L,4L,8L,
16L,32L,64L,128L,
256L,512L,1024L,2048L,
4096L,8192L,16384L,32768L,
65536L,131072L,262144L,524288L,
1048576L,2097152L,4194304L,8388608L,
16777216L,33554432L,67108864L,134217728L,
268435456L,536870912L,1073741824L,2147483647L,
};
long reciptable[2048], fpuasm;
char britable[16][64];
char textfont[1024], smalltextfont[1024];
static char kensmessage[128];
#pragma aux getkensmessagecrc =\
"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",\
parm [ebx]\
modify exact [eax ebx ecx edx]\
static long xb1[MAXWALLSB], yb1[MAXWALLSB], xb2[MAXWALLSB], yb2[MAXWALLSB];
static long rx1[MAXWALLSB], ry1[MAXWALLSB], rx2[MAXWALLSB], ry2[MAXWALLSB];
static short p2[MAXWALLSB], thesector[MAXWALLSB], thewall[MAXWALLSB];
static short bunchfirst[MAXWALLSB], bunchlast[MAXWALLSB];
static short smost[MAXYSAVES], smostcnt;
static short smoststart[MAXWALLSB];
static char smostwalltype[MAXWALLSB];
static long smostwall[MAXWALLSB], smostwallcnt = -1L;
static short maskwall[MAXWALLSB], maskwallcnt;
static long spritesx[MAXSPRITESONSCREEN];
static long spritesy[MAXSPRITESONSCREEN+1];
static long spritesz[MAXSPRITESONSCREEN];
static spritetype *tspriteptr[MAXSPRITESONSCREEN];
short umost[MAXXDIM], dmost[MAXXDIM];
static short bakumost[MAXXDIM], bakdmost[MAXXDIM];
short uplc[MAXXDIM], dplc[MAXXDIM];
static short uwall[MAXXDIM], dwall[MAXXDIM];
static long swplc[MAXXDIM], lplc[MAXXDIM];
static long swall[MAXXDIM], lwall[MAXXDIM+4];
long xdimen = -1, xdimenrecip, halfxdimen, xdimenscale, xdimscale;
long wx1, wy1, wx2, wy2, ydimen;
long viewoffset, frameoffset;
static long rxi[8], ryi[8], rzi[8], rxi2[8], ryi2[8], rzi2[8];
static long xsi[8], ysi[8], *horizlookup, *horizlookup2, horizycent;
long globalposx, globalposy, globalposz, globalhoriz;
short globalang, globalcursectnum;
long globalpal, cosglobalang, singlobalang;
long cosviewingrangeglobalang, sinviewingrangeglobalang;
char *globalpalwritten;
long globaluclip, globaldclip, globvis;
long globalvisibility, globalhisibility, globalpisibility, globalcisibility;
char globparaceilclip, globparaflorclip;
long xyaspect, viewingrangerecip;
long asm1, asm2, asm3, asm4;
long vplce[4], vince[4], palookupoffse[4], bufplce[4];
char globalxshift, globalyshift;
long globalxpanning, globalypanning, globalshade;
short globalpicnum, globalshiftval;
long globalzd, globalbufplc, globalyscale, globalorientation;
long globalx1, globaly1, globalx2, globaly2, globalx3, globaly3, globalzx;
long globalx, globaly, globalz;
static short sectorborder[256], sectorbordercnt;
static char tablesloaded = 0;
long pageoffset, ydim16, qsetmode = 0;
long startposx, startposy, startposz;
short startang, startsectnum;
short pointhighlight, linehighlight, highlightcnt;
static long lastx[MAXYDIM];
char *transluc = NULL, paletteloaded = 0;
#define FASTPALGRIDSIZ 8
static long rdist[129], gdist[129], bdist[129];
static char colhere[((FASTPALGRIDSIZ+2)*(FASTPALGRIDSIZ+2)*(FASTPALGRIDSIZ+2))>>3];
static char colhead[(FASTPALGRIDSIZ+2)*(FASTPALGRIDSIZ+2)*(FASTPALGRIDSIZ+2)];
static long colnext[256];
static char coldist[8] = {0,1,2,3,4,3,2,1};
static long colscan[27];
static short clipnum, hitwalls[4];
long hitscangoalx = (1<<29)-1, hitscangoaly = (1<<29)-1;
typedef struct { long x1, y1, x2, y2; } linetype;
static linetype clipit[MAXCLIPNUM];
static short clipsectorlist[MAXCLIPNUM], clipsectnum;
static short clipobjectval[MAXCLIPNUM];
typedef struct
{
long sx, sy, z;
short a, picnum;
signed char dashade;
char dapalnum, dastat, pagesleft;
long cx1, cy1, cx2, cy2;
} permfifotype;
static permfifotype permfifo[MAXPERMS];
static long permhead = 0, permtail = 0;
short numscans, numhits, numbunches;
static short posfil, capturecount = 0, hitcnt;
static char pcxheader[128] =
{
0xa,0x5,0x1,0x8,0x0,0x0,0x0,0x0,0x3f,0x1,0xc7,0x0,
0x40,0x1,0xc8,0x0,0x0,0x0,0x0,0x8,0x8,0x8,0x10,0x10,
0x10,0x18,0x18,0x18,0x20,0x20,0x20,0x28,0x28,0x28,0x30,0x30,
0x30,0x38,0x38,0x38,0x40,0x40,0x40,0x48,0x48,0x48,0x50,0x50,
0x50,0x58,0x58,0x58,0x60,0x60,0x60,0x68,0x68,0x68,0x70,0x70,
0x70,0x78,0x78,0x78,0x0,0x1,0x40,0x1,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
};
static char vgapal16[48] =
{
00,00,00,00,00,42,00,42,00,00,42,42,42,00,00,42,00,42,42,21,00,42,42,42,
21,21,21,21,21,63,21,63,21,21,63,63,63,21,21,63,21,63,63,63,21,63,63,63,
};
short editstatus = 0;
short searchit;
long searchx = -1, searchy; //search input
short searchsector, searchwall, searchstat; //search output
static char artfilename[20];
static long numtilefiles, artfil = -1, artfilnum, artfilplc;
static char inpreparemirror = 0;
static long mirrorsx1, mirrorsy1, mirrorsx2, mirrorsy2;
long totalclocklock;
extern long mmxoverlay();
#pragma aux mmxoverlay modify [eax ebx ecx edx];
extern long sethlinesizes(long,long,long);
#pragma aux sethlinesizes parm [eax][ebx][ecx];
extern long setpalookupaddress(char *);
#pragma aux setpalookupaddress parm [eax];
extern long setuphlineasm4(long,long);
#pragma aux setuphlineasm4 parm [eax][ebx];
extern long hlineasm4(long,long,long,long,long,long);
#pragma aux hlineasm4 parm [eax][ebx][ecx][edx][esi][edi];
extern long setuprhlineasm4(long,long,long,long,long,long);
#pragma aux setuprhlineasm4 parm [eax][ebx][ecx][edx][esi][edi];
extern long rhlineasm4(long,long,long,long,long,long);
#pragma aux rhlineasm4 parm [eax][ebx][ecx][edx][esi][edi];
extern long setuprmhlineasm4(long,long,long,long,long,long);
#pragma aux setuprmhlineasm4 parm [eax][ebx][ecx][edx][esi][edi];
extern long rmhlineasm4(long,long,long,long,long,long);
#pragma aux rmhlineasm4 parm [eax][ebx][ecx][edx][esi][edi];
extern long setupqrhlineasm4(long,long,long,long,long,long);
#pragma aux setupqrhlineasm4 parm [eax][ebx][ecx][edx][esi][edi];
extern long qrhlineasm4(long,long,long,long,long,long);
#pragma aux qrhlineasm4 parm [eax][ebx][ecx][edx][esi][edi];
extern long setvlinebpl(long);
#pragma aux setvlinebpl parm [eax];
extern long fixtransluscence(long);
#pragma aux fixtransluscence parm [eax];
extern long prevlineasm1(long,long,long,long,long,long);
#pragma aux prevlineasm1 parm [eax][ebx][ecx][edx][esi][edi];
extern long vlineasm1(long,long,long,long,long,long);
#pragma aux vlineasm1 parm [eax][ebx][ecx][edx][esi][edi];
extern long setuptvlineasm(long);
#pragma aux setuptvlineasm parm [eax];
extern long tvlineasm1(long,long,long,long,long,long);
#pragma aux tvlineasm1 parm [eax][ebx][ecx][edx][esi][edi];
extern long setuptvlineasm2(long,long,long);
#pragma aux setuptvlineasm2 parm [eax][ebx][ecx];
extern long tvlineasm2(long,long,long,long,long,long);
#pragma aux tvlineasm2 parm [eax][ebx][ecx][edx][esi][edi];
extern long mvlineasm1(long,long,long,long,long,long);
#pragma aux mvlineasm1 parm [eax][ebx][ecx][edx][esi][edi];
extern long setupvlineasm(long);
#pragma aux setupvlineasm parm [eax];
extern long vlineasm4(long,long);
#pragma aux vlineasm4 parm [ecx][edi] modify [eax ebx ecx edx esi edi];
extern long setupmvlineasm(long);
#pragma aux setupmvlineasm parm [eax];
extern long mvlineasm4(long,long);
#pragma aux mvlineasm4 parm [ecx][edi] modify [eax ebx ecx edx esi edi];
extern void setupspritevline(long,long,long,long,long,long);
#pragma aux setupspritevline parm [eax][ebx][ecx][edx][esi][edi];
extern void spritevline(long,long,long,long,long,long);
#pragma aux spritevline parm [eax][ebx][ecx][edx][esi][edi];
extern void msetupspritevline(long,long,long,long,long,long);
#pragma aux msetupspritevline parm [eax][ebx][ecx][edx][esi][edi];
extern void mspritevline(long,long,long,long,long,long);
#pragma aux mspritevline parm [eax][ebx][ecx][edx][esi][edi];
extern void tsetupspritevline(long,long,long,long,long,long);
#pragma aux tsetupspritevline parm [eax][ebx][ecx][edx][esi][edi];
extern void tspritevline(long,long,long,long,long,long);
#pragma aux tspritevline parm [eax][ebx][ecx][edx][esi][edi];
extern long mhline(long,long,long,long,long,long);
#pragma aux mhline parm [eax][ebx][ecx][edx][esi][edi];
extern long mhlineskipmodify(long,long,long,long,long,long);
#pragma aux mhlineskipmodify parm [eax][ebx][ecx][edx][esi][edi];
extern long msethlineshift(long,long);
#pragma aux msethlineshift parm [eax][ebx];
extern long thline(long,long,long,long,long,long);
#pragma aux thline parm [eax][ebx][ecx][edx][esi][edi];
extern long thlineskipmodify(long,long,long,long,long,long);
#pragma aux thlineskipmodify parm [eax][ebx][ecx][edx][esi][edi];
extern long tsethlineshift(long,long);
#pragma aux tsethlineshift parm [eax][ebx];
extern long setupslopevlin(long,long,long);
#pragma aux setupslopevlin parm [eax][ebx][ecx] modify [edx];
extern long slopevlin(long,long,long,long,long,long);
#pragma aux slopevlin parm [eax][ebx][ecx][edx][esi][edi];
extern long settransnormal();
#pragma aux settransnormal parm;
extern long settransreverse();
#pragma aux settransreverse parm;
extern long setupdrawslab(long,long);
#pragma aux setupdrawslab parm [eax][ebx];
extern long drawslab(long,long,long,long,long,long);
#pragma aux drawslab parm [eax][ebx][ecx][edx][esi][edi];
#pragma aux nsqrtasm =\
"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",\
parm nomemory [eax]\
modify exact [eax ebx ecx]\
#pragma aux msqrtasm =\
"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",\
parm nomemory [ecx]\
modify exact [eax ebx ecx]\
//0x007ff000 is (11<<13), 0x3f800000 is (127<<23)
#pragma aux krecipasm =\
"mov fpuasm, eax",\
"fild dword ptr fpuasm",\
"add eax, eax",\
"fstp dword ptr fpuasm",\
"sbb ebx, ebx",\
"mov eax, fpuasm",\
"mov ecx, eax",\
"and eax, 0x007ff000",\
"shr eax, 10",\
"sub ecx, 0x3f800000",\
"shr ecx, 23",\
"mov eax, dword ptr reciptable[eax]",\
"sar eax, cl",\
"xor eax, ebx",\
parm [eax]\
modify exact [eax ebx ecx]\
#pragma aux setgotpic =\
"mov ebx, eax",\
"cmp byte ptr walock[eax], 200",\
"jae skipit",\
"mov byte ptr walock[eax], 199",\
"skipit: shr eax, 3",\
"and ebx, 7",\
"mov dl, byte ptr gotpic[eax]",\
"mov bl, byte ptr pow2char[ebx]",\
"or dl, bl",\
"mov byte ptr gotpic[eax], dl",\
parm [eax]\
modify exact [eax ebx ecx edx]\
#pragma aux getclipmask =\
"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",\
parm [eax][ebx][ecx][edx]\
modify exact [eax ebx ecx edx]\
drawrooms(long daposx, long daposy, long daposz,
short daang, long dahoriz, short dacursectnum)
{
long i, j, z, cz, fz, closest;
short *shortptr1, *shortptr2;
beforedrawrooms = 0;
totalarea += (windowx2+1-windowx1)*(windowy2+1-windowy1);
globalposx = daposx; globalposy = daposy; globalposz = daposz;
globalang = (daang&2047);
globalhoriz = mulscale16(dahoriz-100,xdimenscale)+(ydimen>>1);
globaluclip = (0-globalhoriz)*xdimscale;
globaldclip = (ydimen-globalhoriz)*xdimscale;
i = mulscale16(xdimenscale,viewingrangerecip);
globalpisibility = mulscale16(parallaxvisibility,i);
globalvisibility = mulscale16(visibility,i);
globalhisibility = mulscale16(globalvisibility,xyaspect);
globalcisibility = mulscale8(globalhisibility,320);
globalcursectnum = dacursectnum;
totalclocklock = totalclock;
cosglobalang = sintable[(globalang+512)&2047];
singlobalang = sintable[globalang&2047];
cosviewingrangeglobalang = mulscale16(cosglobalang,viewingrange);
sinviewingrangeglobalang = mulscale16(singlobalang,viewingrange);
if ((stereomode != 0) || (vidoption == 6))
{
if (stereopixelwidth != ostereopixelwidth)
{
ostereopixelwidth = stereopixelwidth;
xdimen = (windowx2-windowx1+1)+(stereopixelwidth<<1); halfxdimen = (xdimen>>1);
xdimenrecip = divscale32(1L,xdimen);
setaspect((long)divscale16(xdimen,windowx2-windowx1+1),yxaspect);
}
if ((!(activepage&1)) ^ inpreparemirror)
{
for(i=windowx1;i<windowx1+(stereopixelwidth<<1);i++) { startumost[i] = 1, startdmost[i] = 0; }
for(;i<windowx2+1+(stereopixelwidth<<1);i++) { startumost[i] = windowy1, startdmost[i] = windowy2+1; }
viewoffset = windowy1*bytesperline+windowx1-(stereopixelwidth<<1);
i = stereowidth;
}
else
{
for(i=windowx1;i<windowx2+1;i++) { startumost[i] = windowy1, startdmost[i] = windowy2+1; }
for(;i<windowx2+1+(stereopixelwidth<<1);i++) { startumost[i] = 1, startdmost[i] = 0; }
viewoffset = windowy1*bytesperline+windowx1;
i = -stereowidth;
}
globalposx += mulscale24(singlobalang,i);
globalposy -= mulscale24(cosglobalang,i);
if (vidoption == 6) frameplace = FP_OFF(screen)+(activepage&1)*65536;
}
if ((xyaspect != oxyaspect) || (xdimen != oxdimen) || (viewingrange != oviewingrange))
dosetaspect();
frameoffset = frameplace+viewoffset;
clearbufbyte((long)(&gotsector[0]),(long)((numsectors+7)>>3),0L);
shortptr1 = (short *)&startumost[windowx1];
shortptr2 = (short *)&startdmost[windowx1];
i = xdimen-1;
do
{
umost[i] = shortptr1[i]-windowy1;
dmost[i] = shortptr2[i]-windowy1;
i--;
} while (i != 0);
umost[0] = shortptr1[0]-windowy1;
dmost[0] = shortptr2[0]-windowy1;
if (smostwallcnt < 0)
if (getkensmessagecrc(FP_OFF(kensmessage)) != 0x56c764d4)
{ setvmode(0x3); printf("Nice try.\n"); exit(0); }
numhits = xdimen; numscans = 0; numbunches = 0;
maskwallcnt = 0; smostwallcnt = 0; smostcnt = 0; spritesortcnt = 0;
if (globalcursectnum >= MAXSECTORS)
globalcursectnum -= MAXSECTORS;
else
{
i = globalcursectnum;
updatesector(globalposx,globalposy,&globalcursectnum);
if (globalcursectnum < 0) globalcursectnum = i;
}
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 = 0;
mirrorsx1 = xdimen-1; mirrorsx2 = 0;
for(i=numscans-1;i>=0;i--)
{
if (wall[thewall[i]].nextsector < 0) continue;
if (xb1[i] < mirrorsx1) mirrorsx1 = xb1[i];
if (xb2[i] > mirrorsx2) mirrorsx2 = xb2[i];
}
if (stereomode)
{
mirrorsx1 += (stereopixelwidth<<1);
mirrorsx2 += (stereopixelwidth<<1);
}
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))
{
clearbuf((long)(&tempbuf[0]),(long)((numbunches+3)>>2),0L);
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);
if (automapping)
{
for(z=bunchfirst[closest];z>=0;z=p2[z])
show2dwall[thewall[z]>>3] |= pow2char[thewall[z]&7];
}
numbunches--;
bunchfirst[closest] = bunchfirst[numbunches];
bunchlast[closest] = bunchlast[numbunches];
}
}
scansector (short sectnum)
{
walltype *wal, *wal2;
spritetype *spr;
long i, xs, ys, xp, yp, x1, y1, x2, y2, xp1, yp1, xp2, yp2, templong;
short z, zz, startwall, endwall, numscansbefore, scanfirst, bunchfrst;
short nextsectnum;
if (sectnum < 0) return;
if (automapping) show2dsector[sectnum>>3] |= pow2char[sectnum&7];
sectorborder[0] = sectnum, sectorbordercnt = 1;
do
{
sectnum = sectorborder[--sectorbordercnt];
for(z=headspritesect[sectnum];z>=0;z=nextspritesect[z])
{
spr = &sprite[z];
if ((((spr->cstat&0x8000) == 0) || (showinvisibility)) &&
(spr->xrepeat > 0) && (spr->yrepeat > 0) &&
(spritesortcnt < MAXSPRITESONSCREEN))
{
xs = spr->x-globalposx; ys = spr->y-globalposy;
if ((spr->cstat&48) || (xs*cosglobalang+ys*singlobalang > 0))
{
copybufbyte(spr,&tsprite[spritesortcnt],sizeof(spritetype));
tsprite[spritesortcnt++].owner = z;
}
}
}
gotsector[sectnum>>3] |= pow2char[sectnum&7];
bunchfrst = numbunches;
numscansbefore = numscans;
startwall = sector[sectnum].wallptr;
endwall = startwall + sector[sectnum].wallnum;
scanfirst = numscans;
for(z=startwall,wal=&wall[z];z<endwall;z++,wal++)
{
nextsectnum = wal->nextsector;
wal2 = &wall[wal->point2];
x1 = wal->x-globalposx; y1 = wal->y-globalposy;
x2 = wal2->x-globalposx; y2 = wal2->y-globalposy;
if ((nextsectnum >= 0) && ((wal->cstat&32) == 0))
if ((gotsector[nextsectnum>>3]&pow2char[nextsectnum&7]) == 0)
{
templong = x1*y2-x2*y1;
if (((unsigned)templong+262144) < 524288)
if (mulscale5(templong,templong) <= (x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))
sectorborder[sectorbordercnt++] = nextsectnum;
}
if ((z == startwall) || (wall[z-1].point2 != z))
{
xp1 = dmulscale6(y1,cosglobalang,-x1,singlobalang);
yp1 = dmulscale6(x1,cosviewingrangeglobalang,y1,sinviewingrangeglobalang);
}
else
{
xp1 = xp2;
yp1 = yp2;
}
xp2 = dmulscale6(y2,cosglobalang,-x2,singlobalang);
yp2 = dmulscale6(x2,cosviewingrangeglobalang,y2,sinviewingrangeglobalang);
if ((yp1 < 256) && (yp2 < 256)) goto skipitaddwall;
//If wall's NOT facing you
if (dmulscale32(xp1,yp2,-xp2,yp1) >= 0) goto skipitaddwall;
if (xp1 >= -yp1)
{
if ((xp1 > yp1) || (yp1 == 0)) goto skipitaddwall;
xb1[numscans] = halfxdimen + scale(xp1,halfxdimen,yp1);
if (xp1 >= 0) xb1[numscans]++; //Fix for SIGNED divide
if (xb1[numscans] >= xdimen) xb1[numscans] = xdimen-1;
yb1[numscans] = yp1;
}
else
{
if (xp2 < -yp2) goto skipitaddwall;
xb1[numscans] = 0;
templong = yp1-yp2+xp1-xp2;
if (templong == 0) goto skipitaddwall;
yb1[numscans] = yp1 + scale(yp2-yp1,xp1+yp1,templong);
}
if (yb1[numscans] < 256) goto skipitaddwall;
if (xp2 <= yp2)
{
if ((xp2 < -yp2) || (yp2 == 0)) goto skipitaddwall;
xb2[numscans] = halfxdimen + scale(xp2,halfxdimen,yp2) - 1;
if (xp2 >= 0) xb2[numscans]++; //Fix for SIGNED divide
if (xb2[numscans] >= xdimen) xb2[numscans] = xdimen-1;
yb2[numscans] = yp2;
}
else
{
if (xp1 > yp1) goto skipitaddwall;
xb2[numscans] = xdimen-1;
templong = xp2-xp1+yp1-yp2;
if (templong == 0) goto skipitaddwall;
yb2[numscans] = yp1 + scale(yp2-yp1,yp1-xp1,templong);
}
if ((yb2[numscans] < 256) || (xb1[numscans] > xb2[numscans])) goto skipitaddwall;
//Made it all the way!
thesector[numscans] = sectnum; thewall[numscans] = z;
rx1[numscans] = xp1; ry1[numscans] = yp1;
rx2[numscans] = xp2; ry2[numscans] = yp2;
p2[numscans] = numscans+1;
numscans++;
skipitaddwall:
if ((wall[z].point2 < z) && (scanfirst < numscans))
p2[numscans-1] = scanfirst, scanfirst = numscans;
}
for(z=numscansbefore;z<numscans;z++)
if ((wall[thewall[z]].point2 != thewall[p2[z]]) || (xb2[z] >= xb1[p2[z]]))
bunchfirst[numbunches++] = p2[z], p2[z] = -1;
for(z=bunchfrst;z<numbunches;z++)
{
for(zz=bunchfirst[z];p2[zz]>=0;zz=p2[zz]);
bunchlast[z] = zz;
}
} while (sectorbordercnt > 0);
}
wallfront (long l1, long l2)
{
walltype *wal;
long x11, y11, x21, y21, x12, y12, x22, y22, dx, dy, t1, t2;
wal = &wall[thewall[l1]]; x11 = wal->x; y11 = wal->y;
wal = &wall[wal->point2]; x21 = wal->x; y21 = wal->y;
wal = &wall[thewall[l2]]; x12 = wal->x; y12 = wal->y;
wal = &wall[wal->point2]; x22 = wal->x; y22 = wal->y;
dx = x21-x11; dy = y21-y11;
t1 = dmulscale2(x12-x11,dy,-dx,y12-y11); //p1(l2) vs. l1
t2 = dmulscale2(x22-x11,dy,-dx,y22-y11); //p2(l2) vs. l1
if (t1 == 0) { t1 = t2; if (t1 == 0) return(-1); }
if (t2 == 0) t2 = t1;
if ((t1^t2) >= 0)
{
t2 = dmulscale2(globalposx-x11,dy,-dx,globalposy-y11); //pos vs. l1
return((t2^t1) >= 0);
}
dx = x22-x12; dy = y22-y12;
t1 = dmulscale2(x11-x12,dy,-dx,y11-y12); //p1(l1) vs. l2
t2 = dmulscale2(x21-x12,dy,-dx,y21-y12); //p2(l1) vs. l2
if (t1 == 0) { t1 = t2; if (t1 == 0) return(-1); }
if (t2 == 0) t2 = t1;
if ((t1^t2) >= 0)
{
t2 = dmulscale2(globalposx-x12,dy,-dx,globalposy-y12); //pos vs. l2
return((t2^t1) < 0);
}
return(-2);
}
spritewallfront (spritetype *s, long w)
{
walltype *wal;
long x1, y1;
wal = &wall[w]; x1 = wal->x; y1 = wal->y;
wal = &wall[wal->point2];
return (dmulscale32(wal->x-x1,s->y-y1,-(s->x-x1),wal->y-y1) >= 0);
}
bunchfront (long b1, long b2)
{
long x1b1, x2b1, x1b2, x2b2, b1f, b2f, i;
b1f = bunchfirst[b1]; x1b1 = xb1[b1f]; x2b2 = xb2[bunchlast[b2]]+1;
if (x1b1 >= x2b2) return(-1);
b2f = bunchfirst[b2]; x1b2 = xb1[b2f]; x2b1 = xb2[bunchlast[b1]]+1;
if (x1b2 >= x2b1) return(-1);
if (x1b1 >= x1b2)
{
for(i=b2f;xb2[i]<x1b1;i=p2[i]);
return(wallfront(b1f,i));
}
for(i=b1f;xb2[i]<x1b2;i=p2[i]);
return(wallfront(i,b2f));
}
drawalls (long bunch)
{
sectortype *sec, *nextsec;
walltype *wal;
long i, j, k, l, m, n, x, y, x1, x2, cz[5], fz[5];
long z, wallnum, sectnum, nextsectnum, globalhorizbak;
long startsmostwallcnt, startsmostcnt, gotswall;
char andwstat1, andwstat2;
z = bunchfirst[bunch];
sectnum = thesector[z]; sec = §or[sectnum];
andwstat1 = 0xff; andwstat2 = 0xff;
for(;z>=0;z=p2[z]) //uplc/dplc calculation
{
andwstat1 &= wallmost(uplc,z,sectnum,(char)0);
andwstat2 &= wallmost(dplc,z,sectnum,(char)1);
}
if ((andwstat1&3) != 3) //draw ceilings
{
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
{
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=p2[z])
{
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;
}
}
wallnum = thewall[z]; wal = &wall[wallnum];
nextsectnum = wal->nextsector; nextsec = §or[nextsectnum];
gotswall = 0;
startsmostwallcnt = smostwallcnt;
startsmostcnt = smostcnt;
if ((searchit == 2) && (searchx >= x1) && (searchx <= x2))
{
if (searchy <= uplc[searchx]) //ceiling
{
searchsector = sectnum; searchwall = wallnum;
searchstat = 1; searchit = 1;
}
else if (searchy >= dplc[searchx]) //floor
{
searchsector = sectnum; searchwall = wallnum;
searchstat = 2; searchit = 1;
}
}
if (nextsectnum >= 0)
{
getzsofslope((short)sectnum,wal->x,wal->y,&cz[0],&fz[0]);
getzsofslope((short)sectnum,wall[wal->point2].x,wall[wal->point2].y,&cz[1],&fz[1]);
getzsofslope((short)nextsectnum,wal->x,wal->y,&cz[2],&fz[2]);
getzsofslope((short)nextsectnum,wall[wal->point2].x,wall[wal->point2].y,&cz[3],&fz[3]);
getzsofslope((short)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)
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,(char)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))
if (searchy <= dwall[searchx]) //wall
{
searchsector = sectnum; searchwall = wallnum;
searchstat = 0; searchit = 1;
}
globalorientation = (long)wal->cstat;
globalpicnum = wal->picnum;
if ((unsigned)globalpicnum >= (unsigned)MAXTILES) globalpicnum = 0;
globalxpanning = (long)wal->xpanning;
globalypanning = (long)wal->ypanning;
globalshiftval = (picsiz[globalpicnum]>>4);
if (pow2long[globalshiftval] != tilesizy[globalpicnum]) globalshiftval++;
globalshiftval = 32-globalshiftval;
if (picanm[globalpicnum]&192) globalpicnum += animateoffs(globalpicnum,(short)wallnum+16384);
globalshade = (long)wal->shade;
globvis = globalvisibility;
if (sec->visibility != 0) globvis = mulscale4(globvis,(long)((unsigned char)(sec->visibility+16)));
globalpal = (long)wal->pal;
globalyscale = (wal->yrepeat<<(globalshiftval-19));
if ((globalorientation&4) == 0)
globalzd = (((globalposz-nextsec->ceilingz)*globalyscale)<<8);
else
globalzd = (((globalposz-sec->ceilingz)*globalyscale)<<8);
globalzd += (globalypanning<<24);
if (globalorientation&256) globalyscale = -globalyscale, globalzd = -globalzd;
if (gotswall == 0) { gotswall = 1; prepwall(z,wal); }
wallscan(x1,x2,uplc,dwall,swall,lwall);
if ((cz[2] >= cz[0]) && (cz[3] >= cz[1]))
{
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
{
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 < MAXYSAVES)
{
smoststart[smostwallcnt] = smostcnt;
smostwall[smostwallcnt] = z;
smostwalltype[smostwallcnt] = 1; //1 for umost
smostwallcnt++;
copybufbyte((long)&umost[x1],(long)&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)
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,(char)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))
if (searchy >= uwall[searchx]) //wall
{
searchsector = sectnum; searchwall = wallnum;
if ((wal->cstat&2) > 0) searchwall = wal->nextwall;
searchstat = 0; searchit = 1;
}
if ((wal->cstat&2) > 0)
{
wallnum = wal->nextwall; wal = &wall[wallnum];
globalorientation = (long)wal->cstat;
globalpicnum = wal->picnum;
if ((unsigned)globalpicnum >= (unsigned)MAXTILES) globalpicnum = 0;
globalxpanning = (long)wal->xpanning;
globalypanning = (long)wal->ypanning;
if (picanm[globalpicnum]&192) globalpicnum += animateoffs(globalpicnum,(short)wallnum+16384);
globalshade = (long)wal->shade;
globalpal = (long)wal->pal;
wallnum = thewall[z]; wal = &wall[wallnum];
}
else
{