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

   1 #include <stdlib.h>
   2 #include <string.h>
   3 #include "gbaregs.h"
   4 #include "game.h"
   5 #include "dma.h"
   6 #include "data.h"
   7 #include "util.h"
   8 #include "intr.h"
   9 #include "input.h"
  10 #include "sprite.h"
  11 #include "debug.h"
  12
  13 static void draw_tunnel(void);
  14 static void vblank(void);
  15
  16 static int nframes, num_vbl, backbuf;
  17 static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
  18 static unsigned char *tex;
  19 static uint16_t bnstate;
  20
  21 #define MAX_SPR         4
  22 static uint16_t oam[4 * MAX_SPR];
  23
  24 static short x = 120, y = 80;
  25 static unsigned char rot;
  26
  27 static int32_t tunrot;
  28 static int32_t tunmat[4], tunx, tuny;
  29
  30 void gamescr(void)
  31 {
  32         int i;
  33         int32_t scale;
  34         uint16_t *cdst;
  35         unsigned char *csrc;
  36
  37         REG_DISPCNT = 4 | DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1;
  38
  39         vblperf_setcolor(0xff);
  40
  41         /* sprite setup */
  42         spr_setup(16, 16, spr_game_pixels, spr_game_cmap);
  43
  44         wait_vblank();
  45         spr_clear();
  46         spr_oam_clear(oam, 0);
  47         spr_oam_clear(oam, 1);
  48         spr_oam_clear(oam, 2);
  49         spr_oam_clear(oam, 3);
  50
  51         cdst = (uint16_t*)CRAM_BG_ADDR;
  52         csrc = tuncross_cmap;
  53         for(i=0; i<256; i++) {
  54                 *cdst++ = CONV_RGB24_RGB15(csrc[0], csrc[1], csrc[2]);
  55                 csrc += 3;
  56         }
  57
  58         fillblock_16byte(vram[0], 0xffffffff, 240 * 160 / 16);
  59         fillblock_16byte(vram[1], 0xffffffff, 240 * 160 / 16);
  60
  61         tex = iwram_sbrk(32 * 32);
  62         memcpy(tex, tuncross_pixels, 32 * 32);
  63
  64         scale = 0x100;//230;
  65         REG_BG2PA = scale;
  66         REG_BG2PB = 0;
  67         REG_BG2PC = 0;
  68         REG_BG2PD = scale;
  69         REG_BG2X = (120 << 8) - scale * 120;
  70         REG_BG2Y = (80 << 8) - scale * 80;
  71
  72         /*select_input(BN_DPAD);*/
  73
  74         mask(INTR_VBLANK);
  75         screen_vblank = vblank;
  76         unmask(INTR_VBLANK);
  77
  78         nframes = 0;
  79         for(;;) {
  80                 backbuf = ++nframes & 1;
  81
  82                 bnstate = ~REG_KEYINPUT;
  83
  84                 draw_tunnel();
  85
  86                 vblperf_end();
  87                 wait_vblank();
  88                 present(backbuf);
  89                 vblperf_begin();
  90         }
  91 }
  92
  93 #define TUN_U(x)        ((x) & 0x3f)
  94 #define TUN_V(x)        (((x) >> 7) & 0x1ff)
  95
  96 __attribute__((noinline, target("arm"), section(".iwram")))
  97 static void draw_tunnel(void)
  98 {
  99         int i, j, tx, ty, u, v, angle, depth, zoffs, uoffs, flip, tunturn;
 100         static int tunsweep;
 101         uint16_t pptop, ppbot;
 102         uint16_t *top, *bot;
 103         uint32_t tun, *tunptr;
 104
 105         //tunsweep = SIN(nframes) >> 4;
 106
 107         if((bnstate & BN_RT) && tunsweep > -31) tunsweep--;
 108         if((bnstate & BN_LT) && tunsweep < 31) tunsweep++;
 109
 110         flip = tunsweep < 0;
 111         tunturn = abs(tunsweep) & 0x1f;
 112
 113         zoffs = num_vbl;
 114         uoffs = 0;//(flip ? -num_vbl : num_vbl) >> 2;
 115
 116         top = vram[backbuf];
 117         bot = vram[backbuf] + 159 * 240 / 2;
 118         tunptr = tunmap + tunturn * 9600;
 119
 120         if(flip) {
 121                 tunptr += 240/2;
 122                 for(i=0; i<80; i++) {
 123                         for(j=0; j<240/2; j++) {
 124                                 tun = *--tunptr;
 125
 126                                 angle = TUN_U(tun >> 16);
 127                                 depth = TUN_V(tun >> 16);
 128                                 tx = ~(angle - uoffs) & 0x1f;
 129                                 ty = (depth + zoffs) & 0x1f;
 130                                 pptop = tex[(ty << 5) + tx];
 131                                 tx = (angle + uoffs) & 0x1f;
 132                                 ppbot = tex[(ty << 5) + tx];
 133
 134                                 angle = TUN_U(tun);
 135                                 depth = TUN_V(tun);
 136                                 tx = ~(angle - uoffs) & 0x1f;
 137                                 ty = (depth + zoffs) & 0x1f;
 138                                 pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
 139                                 tx = (angle + uoffs) & 0x1f;
 140                                 ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
 141
 142                                 *top++ = pptop;
 143                                 *bot++ = ppbot;
 144                         }
 145                         bot -= 240;
 146                         tunptr += 240;
 147                 }
 148         } else {
 149                 for(i=0; i<80; i++) {
 150                         for(j=0; j<240/2; j++) {
 151                                 tun = *tunptr++;
 152
 153                                 angle = TUN_U(tun);
 154                                 depth = TUN_V(tun);
 155                                 tx = (angle - uoffs) & 0x1f;
 156                                 ty = (depth + zoffs) & 0x1f;
 157                                 pptop = tex[(ty << 5) + tx];
 158                                 tx = ~(angle + uoffs) & 0x1f;
 159                                 ppbot = tex[(ty << 5) + tx];
 160
 161                                 angle = TUN_U(tun >> 16);
 162                                 depth = TUN_V(tun >> 16);
 163                                 tx = (angle - uoffs) & 0x1f;
 164                                 ty = (depth + zoffs) & 0x1f;
 165                                 pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
 166                                 tx = ~(angle + uoffs) & 0x1f;
 167                                 ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
 168
 169                                 *top++ = pptop;
 170                                 *bot++ = ppbot;
 171                         }
 172                         bot -= 240;
 173                 }
 174         }
 175 }
 176
 177 __attribute__((noinline, target("arm"), section(".iwram")))
 178 static void vblank(void)
 179 {
 180         uint16_t bnstate;
 181         int16_t mat[4];
 182         static short gate_speed;
 183
 184         num_vbl++;
 185
 186         bnstate = ~REG_KEYINPUT;
 187         if(bnstate & BN_DPAD) {
 188                 if(gate_speed < 5) {
 189                         gate_speed++;
 190                 }
 191
 192                 if(bnstate & BN_LEFT) x -= gate_speed;
 193                 if(bnstate & BN_RIGHT) x += gate_speed;
 194                 if(bnstate & BN_UP) y -= gate_speed;
 195                 if(bnstate & BN_DOWN) y += gate_speed;
 196
 197                 if(x < 0) x = 0;
 198                 if(x > 239) x = 239;
 199                 if(y < 0) y = 0;
 200                 if(y > 159) y = 159;
 201         } else {
 202                 gate_speed = 0;
 203         }
 204
 205         if(bnstate & BN_A) rot -= 2;
 206         if(bnstate & BN_B) rot += 2;
 207
 208
 209         spr_oam(oam, 0, 512 + 256, x - 64, y - 64, SPR_256COL | SPR_SZ64 | SPR_DBLSZ |
 210                         SPR_ROTSCL | SPR_ROTSCL_SEL(0));
 211
 212         mat[0] = COS(rot);
 213         mat[1] = -SIN(rot);
 214         mat[2] = SIN(rot);
 215         mat[3] = COS(rot);
 216         spr_transform(oam, 0, mat);
 217
 218
 219         dma_copy16(3, (void*)OAM_ADDR, oam, sizeof oam / 2, 0);
 220 }