git.mutantstargoat.com Git - voxscape/blob - src/lut.c

   1 #include <stdio.h>
   2 #include <math.h>
   3 #include "lut.h"
   4
   5 /*#include "sintab.h"*/
   6
   7 #undef WRITE_C
   8
   9 #ifndef SINTAB_DATA_H_
  10 int32_t sintab[SINTAB_SIZE];
  11 #endif
  12
  13 void init_lut(void)
  14 {
  15 #ifndef SINTAB_DATA_H_
  16         int i;
  17         float t, theta;
  18
  19 #ifdef WRITE_C
  20         int col = 4;
  21         FILE *fp = fopen("sintab.h", "wb");
  22         if(fp) {
  23                 fprintf(fp, "#ifndef SINTAB_DATA_H_\n");
  24                 fprintf(fp, "#define SINTAB_DATA_H_\n\n");
  25                 fprintf(fp, "int32_t sintab[] = {\n\t");
  26         }
  27 #endif
  28
  29         for(i=0; i<SINTAB_SIZE; i++) {
  30                 t = (float)i / SINTAB_SIZE;
  31                 theta = t * (M_PI * 2);
  32                 sintab[i] = (int32_t)(sin(theta) * 65536.0f);
  33 #ifdef WRITE_C
  34                 if(fp) {
  35                         col += fprintf(fp, "%ld", (long)sintab[i]);
  36                         if(i < SINTAB_SIZE - 1) {
  37                                 if(col >= 72) {
  38                                         fprintf(fp, ",\n\t");
  39                                         col = 4;
  40                                 } else {
  41                                         col += fprintf(fp, ", ");
  42                                 }
  43                         } else {
  44                                 fprintf(fp, "\n");
  45                         }
  46                 }
  47 #endif
  48         }
  49
  50 #ifdef WRITE_C
  51         if(fp) {
  52                 fprintf(fp, "};\n\n");
  53                 fprintf(fp, "#endif\t/* SINTAB_DATA_H_ */\n");
  54                 fclose(fp);
  55         }
  56 #endif
  57 #endif  /* !defined SINTAB_DATA_H_ */
  58 }