git.mutantstargoat.com Git - dos_low3d/blob - tools/genlut.c

   1 #include <stdio.h>
   2 #include <math.h>
   3
   4 #define SINTAB_SIZE             512
   5 #define SINTAB_SCALE    8192
   6
   7 int main(void)
   8 {
   9         int i, len;
  10
  11         printf("\tbits 32\n");
  12         printf("\tsection .rodata\n\n");
  13
  14         printf("\tglobal _sintab\n");
  15         printf("_sintab:\n");
  16
  17         fputs("\tdw", stdout);
  18         len = 10;
  19         for(i=0; i<SINTAB_SIZE; i++) {
  20                 double theta = (double)i / (double)SINTAB_SIZE * 6.28318530718;
  21                 double sf = sin(theta);
  22                 int sx = (int)(sf * SINTAB_SCALE);
  23                 len += printf(" %d", sx);
  24                 if(len >= 72) {
  25                         putchar('\n');
  26                         if(i < SINTAB_SIZE - 1) {
  27                                 fputs("\tdw", stdout);
  28                                 len = 10;
  29                         }
  30                 } else {
  31                         putchar(',');
  32                         len++;
  33                 }
  34         }
  35         printf("\n\n; vi:ft=nasm ts=8 sts=8 sw=8:\n");
  36         return 0;
  37 }