git.mutantstargoat.com Git - mdlife/blob - src/part_mitosis.c

   1 #include <stdio.h>
   2 #include "vdp.h"
   3 #include "demo.h"
   4 #include "pad.h"
   5 #include "parts.h"
   6 #include "debug.h"
   7
   8
   9 #define FTILES_OFFS             256
  10
  11 extern uint16_t floor_data[], floor_data_end[];
  12 extern unsigned char floor_cmap[], floor_cmap_end[];
  13 extern uint16_t floor_tmap[], floor_tmap_end[];
  14
  15 static short scroll;
  16
  17 void mitosis_init(void)
  18 {
  19         uint16_t *src;
  20
  21         src = floor_data;
  22         vdp_setup_addr(VDP_VRAM, FTILES_OFFS * 32);
  23         while(src < floor_data_end) {
  24                 VDP_DATA = *src++;
  25         }
  26 }
  27
  28 void mitosis_start(void)
  29 {
  30         int i;
  31         uint16_t *src;
  32         unsigned char *cptr;
  33
  34         /* setup tilemap */
  35         src = floor_tmap;
  36         vdp_setup_addr(VDP_VRAM, 0xc000);
  37         while(src < floor_tmap_end) {
  38                 VDP_DATA = VDP_TILENAME(*src++ + FTILES_OFFS, 3, 0);
  39         }
  40
  41         /* setup colormap */
  42         cptr = floor_cmap;
  43         for(i=0; i<16; i++) {
  44                 vdp_setcolor(3, i, cptr[0] >> 4, cptr[1] >> 4, cptr[2] >> 4);
  45                 cptr += 3;
  46         }
  47
  48         vdp_setreg(VDP_REG_MODE3, VDP_M3_HLINE);
  49         scroll = 0;
  50 }
  51
  52 static int16_t scrolltab[96];
  53
  54 void mitosis_update(void)
  55 {
  56         short i, dir;
  57         int16_t delta;
  58
  59         if(bnstate & PAD_LEFT) {
  60                 dir = -1;
  61         } else if(bnstate & PAD_RIGHT) {
  62                 dir = 1;
  63         } else {
  64                 dir = 0;
  65         }
  66
  67         if(dir) {
  68                 for(i=0; i<96; i++) {
  69                         delta = ((96 - i) + 64) << 1;
  70                         if(dir > 0) {
  71                                 scrolltab[i] += delta;
  72                         } else {
  73                                 scrolltab[i] -= delta;
  74                         }
  75                 }
  76         }
  77
  78         dbgval[0] = scrolltab[0];
  79 }
  80
  81 void mitosis_vblank(void)
  82 {
  83         short i;
  84         uint16_t val;
  85
  86         vdp_setup_addr(VDP_VRAM, 0xf000);       /* hscroll table is at f000, see vdp.S */
  87         for(i=0; i<96; i++) {
  88                 val = 512 - (scrolltab[i] >> 8);
  89                 VDP_DATA = val;
  90                 VDP_DATA = val;
  91         }
  92 }
  93