git.mutantstargoat.com Git - gbajam21/blob - src/gamescr.c

   1 #include <string.h>
   2 #include "gbaregs.h"
   3 #include "dma.h"
   4 #include "data.h"
   5 #include "debug.h"
   6
   7 #define present(x) \
   8         do { \
   9                 REG_DISPCNT = DISPCNT_BG2 | 4 | ((x) << 4); \
  10         } while(0)
  11
  12
  13 void gamescr(void)
  14 {
  15         int i, j, tx, ty, angle, depth, nframes, backbuf, zoffs;
  16         static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
  17         uint16_t *cdst;
  18         unsigned char *csrc;
  19         uint32_t tun, *tunptr;
  20
  21         REG_DISPCNT = 4 | DISPCNT_BG2 | DISPCNT_FB1;
  22
  23         cdst = (uint16_t*)CRAM_BG_ADDR;
  24         csrc = tuncross_cmap;
  25         for(i=0; i<256; i++) {
  26                 *cdst++ = CONV_RGB24_RGB15(csrc[0], csrc[1], csrc[2]);
  27                 csrc += 3;
  28         }
  29
  30         nframes = 0;
  31         for(;;) {
  32                 backbuf = ++nframes & 1;
  33
  34                 zoffs = nframes << 1;
  35
  36                 cdst = vram[backbuf];
  37                 tunptr = tunmap;
  38                 for(i=0; i<160; i++) {
  39                         for(j=0; j<240/2; j++) {
  40                                 uint16_t pp;
  41
  42                                 tun = *tunptr++;
  43                                 angle = tun & 0xffff;
  44                                 depth = tun >> 16;
  45                                 tx = (angle >> 6) & 0x7f;
  46                                 ty = ((depth >> 7) - zoffs) & 0x7f;
  47                                 pp = tuncross_pixels[(ty << 7) + tx];
  48
  49                                 tun = *tunptr++;
  50                                 angle = tun & 0xffff;
  51                                 depth = tun >> 16;
  52                                 tx = (angle >> 6) & 0x7f;
  53                                 ty = ((depth >> 7) - zoffs) & 0x7f;
  54                                 pp |= (uint16_t)tuncross_pixels[(ty << 7) + tx] << 8;
  55
  56                                 *cdst++ = pp;
  57                         }
  58                 }
  59
  60                 //while(!(REG_DISPSTAT & DISPSTAT_VBLANK));
  61                 while(REG_VCOUNT < 160);
  62                 //REG_DISPCNT ^= DISPCNT_FB1;
  63                 present(backbuf);
  64         }
  65 }