git.mutantstargoat.com Git - gbajam22/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 "util.h"
   7 #include "intr.h"
   8 #include "input.h"
   9 #include "player.h"
  10 #include "sprite.h"
  11 #include "debug.h"
  12 #include "level.h"
  13 #include "xgl.h"
  14 #include "polyfill.h"
  15
  16 static void update(void);
  17 static void draw(void);
  18 static void vblank(void);
  19
  20 static int nframes, num_vbl, backbuf;
  21 static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
  22
  23 static const char *testlvl =
  24         "########\n"
  25         "###   s#\n"
  26         "### ####\n"
  27         "###    #\n"
  28         "##     #\n"
  29         "##     #\n"
  30         "##     #\n"
  31         "## ### #\n"
  32         "## ### #\n"
  33         "##     #\n"
  34         "#### ###\n"
  35         "########\n";
  36
  37 static struct xvertex tm_floor[] __attribute__((section(".rodata"))) = {
  38         {0x10000, -0x10000, 0x10000,    0, 0x10000, 0,  210},
  39         {-0x10000, -0x10000, 0x10000,   0, 0x10000, 0,  210},
  40         {-0x10000, -0x10000, -0x10000,  0, 0x10000, 0,  210},
  41         {0x10000, -0x10000, -0x10000,   0, 0x10000, 0,  210}
  42 };
  43
  44
  45 static struct level *lvl;
  46
  47 static struct player player;
  48
  49
  50 void gamescr(void)
  51 {
  52         int i;
  53         unsigned char *fb;
  54         uint16_t *cmap;
  55
  56         REG_DISPCNT = 4 | DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1;
  57
  58         vblperf_setcolor(1);
  59
  60         lvl = init_level(testlvl);
  61
  62         xgl_init();
  63
  64         memset(&player, 0, sizeof player);
  65         player.phi = 0x100;
  66
  67         cmap = (uint16_t*)CRAM_BG_ADDR;
  68         *cmap++ = 0;
  69         for(i=1; i<255; i++) {
  70                 *cmap++ = rand();
  71         }
  72         *cmap = 0xffff;
  73
  74
  75         select_input(BN_DPAD | BN_A | BN_B);
  76
  77         mask(INTR_VBLANK);
  78         screen_vblank = vblank;
  79         unmask(INTR_VBLANK);
  80
  81         nframes = 0;
  82         for(;;) {
  83                 backbuf = ++nframes & 1;
  84                 fb = (unsigned char*)vram[backbuf];
  85
  86                 polyfill_framebuffer(fb, 240, 160);
  87                 fillblock_16byte(fb, 0, 240 * 160 / 16);
  88
  89                 update();
  90                 draw();
  91
  92                 vblperf_end();
  93                 wait_vblank();
  94                 present(backbuf);
  95                 vblperf_begin();
  96         }
  97 }
  98
  99 static void update(void)
 100 {
 101         uint16_t bnstate;
 102
 103         bnstate = get_input();
 104
 105         player_input(&player, bnstate);
 106
 107         upd_vis(lvl, &player);
 108 }
 109
 110 static void draw(void)
 111 {
 112         int i, x, y;
 113         struct cell *cell;
 114
 115         xgl_load_identity();
 116         xgl_translate(0, 0, 0x100000);
 117         xgl_rotate_x(player.phi);
 118         xgl_rotate_y(player.theta);
 119         xgl_translate(player.x, 0, player.y);
 120
 121         for(i=0; i<lvl->numvis; i++) {
 122                 cell = lvl->vis[i];
 123
 124                 x = (int32_t)(cell->x - player.cx) << 17;
 125                 y = -(int32_t)(cell->y - player.cy) << 17;
 126
 127                 xgl_push_matrix();
 128                 xgl_translate(x, 0, y);
 129                 xgl_index(i + 1);
 130                 xgl_draw(XGL_QUADS, tm_floor, sizeof tm_floor / sizeof *tm_floor);
 131                 xgl_pop_matrix();
 132         }
 133 }
 134
 135 __attribute__((noinline, target("arm"), section(".iwram")))
 136 static void vblank(void)
 137 {
 138         num_vbl++;
 139 }