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 "gba.h"
  11 #include "sprite.h"
  12 #include "debug.h"
  13 #include "level.h"
  14 #include "xgl.h"
  15 #include "polyfill.h"
  16
  17 static int gamescr_start(void);
  18 static void gamescr_stop(void);
  19 static void gamescr_frame(void);
  20 static void gamescr_vblank(void);
  21
  22 static void update(void);
  23 static void draw(void);
  24
  25 static struct screen gamescr = {
  26         "game",
  27         gamescr_start,
  28         gamescr_stop,
  29         gamescr_frame,
  30         gamescr_vblank
  31 };
  32
  33 static int nframes, num_vbl, backbuf;
  34 static uint16_t *vram[] = { gba_vram_lfb0, gba_vram_lfb1 };
  35
  36 static const char *testlvl =
  37         "################\n"
  38         "################\n"
  39         "################\n"
  40         "################\n"
  41         "################\n"
  42         "#######   s#####\n"
  43         "####### ########\n"
  44         "#######    #####\n"
  45         "######     #####\n"
  46         "######     #####\n"
  47         "######     #####\n"
  48         "###### ### #####\n"
  49         "###### ### #####\n"
  50         "######     #####\n"
  51         "######## #######\n"
  52         "################\n"
  53         "################\n"
  54         "################\n"
  55         "################\n"
  56         "################\n";
  57
  58 static struct xvertex tm_floor[] __attribute__((section(".rodata"))) = {
  59         {0x10000, -0x10000, 0x10000,    0, 0x10000, 0,  210},
  60         {-0x10000, -0x10000, 0x10000,   0, 0x10000, 0,  210},
  61         {-0x10000, -0x10000, -0x10000,  0, 0x10000, 0,  210},
  62         {0x10000, -0x10000, -0x10000,   0, 0x10000, 0,  210}
  63 };
  64
  65
  66 static struct level *lvl;
  67
  68 static struct player player;
  69
  70
  71 struct screen *init_game_screen(void)
  72 {
  73         return &gamescr;
  74 }
  75
  76 static int gamescr_start(void)
  77 {
  78         int i;
  79         uint16_t *cmap;
  80
  81         gba_setmode(4, DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1);
  82
  83         vblperf_setcolor(1);
  84
  85         lvl = init_level(testlvl);
  86
  87         xgl_init();
  88
  89         init_player(&player, lvl);
  90         player.phi = 0x100;
  91
  92         cmap = gba_bgpal;
  93         *cmap++ = 0;
  94         for(i=1; i<255; i++) {
  95                 *cmap++ = rand();
  96         }
  97         *cmap = 0xffff;
  98
  99
 100         select_input(BN_DPAD | BN_A | BN_B);
 101
 102         nframes = 0;
 103         return 0;
 104 }
 105
 106 static void gamescr_stop(void)
 107 {
 108 }
 109
 110 static void gamescr_frame(void)
 111 {
 112         unsigned char *fb;
 113
 114         backbuf = ++nframes & 1;
 115         fb = (unsigned char*)vram[backbuf];
 116
 117         polyfill_framebuffer(fb, 240, 160);
 118         fillblock_16byte(fb, 0, 240 * 160 / 16);
 119
 120         update();
 121         draw();
 122
 123         vblperf_end();
 124         wait_vblank();
 125         present(backbuf);
 126         vblperf_begin();
 127 }
 128
 129 static void update(void)
 130 {
 131         uint16_t bnstate;
 132
 133         bnstate = get_input();
 134
 135         player_input(&player, bnstate);
 136
 137         upd_vis(lvl, &player);
 138 }
 139
 140 static void draw(void)
 141 {
 142         int i, x, y;
 143         struct cell *cell;
 144
 145         xgl_load_identity();
 146 #ifndef BUILD_GBA
 147         xgl_translate(0, 0, view_zoom);
 148 #endif
 149         xgl_rotate_x(player.phi);
 150         xgl_rotate_y(player.theta);
 151         xgl_translate(player.x, 0, player.y);
 152
 153         for(i=0; i<lvl->numvis; i++) {
 154                 cell = lvl->vis[i];
 155
 156                 x = (int32_t)(cell->x - player.cx) << 17;
 157                 y = -(int32_t)(cell->y - player.cy) << 17;
 158
 159                 xgl_push_matrix();
 160                 xgl_translate(x, 0, y);
 161                 xgl_index(i + 1);
 162                 xgl_draw(XGL_QUADS, tm_floor, sizeof tm_floor / sizeof *tm_floor);
 163                 xgl_pop_matrix();
 164         }
 165 }
 166
 167 #ifdef BUILD_GBA
 168 __attribute__((noinline, target("arm"), section(".iwram")))
 169 #endif
 170 static void gamescr_vblank(void)
 171 {
 172         num_vbl++;
 173 }