155 lines
3.1 KiB
Text
155 lines
3.1 KiB
Text
#include <stdio.h>
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#include <conio.h>
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#include <stdarg.h>
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int depth=2;
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int bail=150;
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int group=150;
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FILE *f1;
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void P(char *str,...)
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{
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char out[256];
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va_list argp;
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va_start(argp,str);
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vsprintf(out,str,argp);
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fprintf(f1,"%s\n",out);
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va_end(argp);
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}
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long weirdflip(unsigned long l)
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{
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long m,lo,hi;
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lo=l&0xffff;
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hi=l>>16;
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m=(lo<<16)+hi;
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return(m);
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}
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main()
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{
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int i,j,jm,y,a;
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long l;
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f1=fopen("theloop.inc","wt");
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P(";Register usage: ");
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P(";eax low... ray heigth ");
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P(";ebx - p->screen ");
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P(";ecx low... ray direction (always negative)");
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P(";edx - scenary heigth ");
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P(";esi - xsin ");
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P(";edi - ysin ");
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P(";ebp - p->ray_dir_table");
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P(";ds ->codesegment");
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P(";es ->screenbuffer");
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P(";fs ->wavetable");
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P(";gs -");
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P("");
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P("ALIGN 16 ;following should stay in cache");
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P("theloop_waveseg dw 0");
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P("theloop_xsina dw 0");
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P("theloop_ysina dw 0");
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P("theloop_heigth dw 0");
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P("theloop_raydir LABEL DWORD");
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for(y=0;y<200;y++)
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{
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a=(199-y)-100;
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l=-(long)a*10L*256L*depth;
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l=weirdflip(l);
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P("dd 0%08lXh",l);
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}
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P("");
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P(";entry: es=videbuf");
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P("; bp=pointer to bottom of current column in videbuf");
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P("; fs=waveXsegment");
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P("; gs=waveYsegment");
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P("; si=waveXpos");
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P("; di=waveYpos");
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P("; cx=waveXadd");
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P("; dx=waveYadd");
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P("; ax=camera heigth adder");
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P("theloop PROC FAR");
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P("mov bx,bp");
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P("mov cs:theloop_xsina,cx");
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P("mov cs:theloop_ysina,dx");
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P("mov cs:theloop_heigth,ax");
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P("mov bp,OFFSET theloop_raydir");
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P("mov ax,cs");
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P("mov ds,ax");
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P("xor eax,eax");
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P("mov ecx,ds:[bp]");
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P("add bp,4");
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for(i=0;i<bail;i+=group)
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{
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jm=i+group; if(jm>bail) jm=bail;
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for(j=i;j<jm;j++)
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{
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printf("%i\r",j);
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P("_@seek%i:",j);
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P("add si,ds:theloop_xsina");
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P("xor dh,dh");
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P("mov dl,fs:[si]");
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P("add di,ds:theloop_ysina");
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P("add dl,gs:[di]");
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P("add dx,ds:theloop_heigth");
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P("cmp ax,dx");
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P("jge short _@seeko%i",j);
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l=j*10L*256*depth;
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l=weirdflip(l);
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P("_@hit%i:",j);
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P("add eax,0%08lXh",l);
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P("adc ax,0");
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P("mov es:[bx],dl");
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P("cmp ax,dx");
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P("jge short _@seek1a%i",j);
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P("add eax,0%08lXh",l);
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P("adc ax,0");
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P("mov es:[bx-320],dl");
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P("cmp ax,dx");
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P("jge short _@seek2a%i",j);
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P("add eax,0%08lXh",l);
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P("adc ax,0");
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P("mov es:[bx-640],dl");
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P("cmp ax,dx");
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P("jge short _@seek3a%i",j);
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P("add eax,0%08lXh",l);
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P("adc ax,0");
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P("mov es:[bx-960],dl");
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P("add bp,4*4");
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P("sub bx,320*4");
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P("cmp ax,dx");
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P("jge short _@seek0a%i",j);
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P("jmp _@hit%i",j);
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P("_@seek3a%i:",j);
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P("add bp,4");
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P("sub bx,320");
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P("_@seek2a%i:",j);
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P("add bp,4");
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P("sub bx,320");
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P("_@seek1a%i:",j);
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P("add bp,4");
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P("sub bx,320");
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P("_@seek0a%i:",j);
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P("mov ecx,ds:[bp]");
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P("_@seeko%i:",j);
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P("add eax,ecx");
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P("adc ax,-1");
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}
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if(jm>=bail)
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{
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P("_@seek%i:",bail);
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P("_@seekr%i:",bail);
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P("ret");
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}
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else P("jmp _@seek%i",jm);
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}
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P("theloop ENDP");
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printf(" \r",i);
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fclose(f1);
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}
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