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 "sprite.h"
  10 #include "debug.h"
  11 #include "level.h"
  12 #include "xgl.h"
  13 #include "polyfill.h"
  14
  15 static void update(void);
  16 static void draw(void);
  17 static void vblank(void);
  18
  19 static int nframes, num_vbl, backbuf;
  20 static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
  21
  22 static const char *testlvl =
  23         "########\n"
  24         "###   s#\n"
  25         "### ####\n"
  26         "###    #\n"
  27         "##     #\n"
  28         "##     #\n"
  29         "##     #\n"
  30         "## ### #\n"
  31         "## ### #\n"
  32         "##     #\n"
  33         "#### ###\n"
  34         "########\n";
  35
  36 static struct xvertex cube[] __attribute__((section(".rodata"))) = {
  37         /* front */
  38         {-0x10000, -0x10000, -0x10000,  0, 0, -0x10000, 255},
  39         {0x10000, -0x10000, -0x10000,   0, 0, -0x10000, 255},
  40         {0x10000, 0x10000, -0x10000,    0, 0, -0x10000, 255},
  41         {-0x10000, 0x10000, -0x10000,   0, 0, -0x10000, 255},
  42         /* right */
  43         {0x10000, -0x10000, -0x10000,   0x10000, 0, 0,  128},
  44         {0x10000, -0x10000, 0x10000,    0x10000, 0, 0,  128},
  45         {0x10000, 0x10000, 0x10000,             0x10000, 0, 0,  128},
  46         {0x10000, 0x10000, -0x10000,    0x10000, 0, 0,  128},
  47         /* back */
  48         {0x10000, -0x10000, 0x10000,    0, 0, 0x10000,  200},
  49         {-0x10000, -0x10000, 0x10000,   0, 0, 0x10000,  200},
  50         {-0x10000, 0x10000, 0x10000,    0, 0, 0x10000,  200},
  51         {0x10000, 0x10000, 0x10000,             0, 0, 0x10000,  200},
  52         /* left */
  53         {-0x10000, -0x10000, 0x10000,   -0x10000, 0, 0, 192},
  54         {-0x10000, -0x10000, -0x10000,  -0x10000, 0, 0, 192},
  55         {-0x10000, 0x10000, -0x10000,   -0x10000, 0, 0, 192},
  56         {-0x10000, 0x10000, 0x10000,    -0x10000, 0, 0, 192},
  57         /* top */
  58         {-0x10000, 0x10000, -0x10000,   0, 0x10000, 0,  150},
  59         {0x10000, 0x10000, -0x10000,    0, 0x10000, 0,  150},
  60         {0x10000, 0x10000, 0x10000,             0, 0x10000, 0,  150},
  61         {-0x10000, 0x10000, 0x10000,    0, 0x10000, 0,  150},
  62         /* bottom */
  63         {0x10000, -0x10000, -0x10000,   0, -0x10000, 0, 210},
  64         {-0x10000, -0x10000, -0x10000,  0, -0x10000, 0, 210},
  65         {-0x10000, -0x10000, 0x10000,   0, -0x10000, 0, 210},
  66         {0x10000, -0x10000, 0x10000,    0, -0x10000, 0, 210}
  67 };
  68
  69
  70 static struct level *lvl;
  71
  72 static int32_t cam_theta, cam_phi;
  73
  74 void gamescr(void)
  75 {
  76         unsigned char *fb;
  77
  78         REG_DISPCNT = 4 | DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1;
  79
  80         vblperf_setcolor(0xff);
  81
  82         lvl = init_level(testlvl);
  83
  84         xgl_init();
  85
  86         select_input(BN_DPAD);
  87
  88         mask(INTR_VBLANK);
  89         screen_vblank = vblank;
  90         unmask(INTR_VBLANK);
  91
  92         nframes = 0;
  93         for(;;) {
  94                 backbuf = ++nframes & 1;
  95                 fb = (unsigned char*)vram[backbuf];
  96
  97                 polyfill_framebuffer(fb, 240, 160);
  98                 fillblock_16byte(fb, 0, 240 * 160 / 16);
  99
 100                 update();
 101                 draw();
 102
 103                 vblperf_end();
 104                 wait_vblank();
 105                 present(backbuf);
 106                 vblperf_begin();
 107         }
 108 }
 109
 110 static void update(void)
 111 {
 112         uint16_t bnstate;
 113
 114         bnstate = get_input();
 115
 116         if(bnstate & KEY_UP) {
 117                 cam_phi += 0x2000;
 118                 if(cam_phi > X_HPI) cam_phi = X_HPI;
 119         }
 120         if(bnstate & KEY_DOWN) {
 121                 cam_phi -= 0x2000;
 122                 if(cam_phi < -X_HPI) cam_phi = -X_HPI;
 123         }
 124         if(bnstate & KEY_LEFT) {
 125                 cam_theta += 0x2000;
 126                 if(cam_theta > X_2PI) cam_theta -= X_2PI;
 127         }
 128         if(bnstate & KEY_RIGHT) {
 129                 cam_theta -= 0x2000;
 130                 if(cam_theta < X_2PI) cam_theta += X_2PI;
 131         }
 132 }
 133
 134 static void draw(void)
 135 {
 136         xgl_load_identity();
 137         //xgl_translate(0, -0x50000, 0);
 138         xgl_translate(0, 0, 0x80000);
 139         xgl_rotate_x(cam_phi);
 140         xgl_rotate_y(cam_theta);
 141
 142         xgl_draw(XGL_QUADS, cube, sizeof cube / sizeof *cube);
 143 }
 144
 145 __attribute__((noinline, target("arm"), section(".iwram")))
 146 static void vblank(void)
 147 {
 148         num_vbl++;
 149 }