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
  15 static int gamescr_start(void);
  16 static void gamescr_stop(void);
  17 static void gamescr_frame(void);
  18 static void gamescr_vblank(void);
  19
  20 static void update(void);
  21 static void draw(void);
  22
  23 static struct screen gamescr = {
  24         "game",
  25         gamescr_start,
  26         gamescr_stop,
  27         gamescr_frame,
  28         gamescr_vblank
  29 };
  30
  31 static int nframes, num_vbl, backbuf;
  32 static uint16_t *vram[] = { gba_vram_lfb0, gba_vram_lfb1 };
  33
  34 static int32_t pos[2], angle;
  35 static struct voxscape *vox;
  36
  37 #define COLOR_HORIZON   0xcc77ff
  38 #define COLOR_ZENITH    0x5588cc
  39
  40
  41
  42 struct screen *init_game_screen(void)
  43 {
  44         return &gamescr;
  45 }
  46
  47 static int gamescr_start(void)
  48 {
  49         gba_setmode(4, DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1);
  50
  51         vblperf_setcolor(1);
  52
  53         if(!(vox = vox_create(512, 512))) {
  54                 panic(get_pc(), "vox_create");
  55         }
  56         vox_proj(vox, 45, 1, 250);
  57
  58         /*select_input(BN_DPAD | BN_LT | BN_RT);*/
  59
  60         nframes = 0;
  61         return 0;
  62 }
  63
  64 static void gamescr_stop(void)
  65 {
  66 }
  67
  68 static void gamescr_frame(void)
  69 {
  70         unsigned char *fb;
  71
  72         backbuf = ++nframes & 1;
  73         fb = (unsigned char*)vram[backbuf];
  74
  75         vox_framebuf(vox, 240, 160, fb, -1);
  76
  77         update();
  78         draw();
  79
  80         vblperf_end();
  81         wait_vblank();
  82         present(backbuf);
  83         vblperf_begin();
  84 }
  85
  86 #define WALK_SPEED      0x40000
  87 #define TURN_SPEED      0x100
  88
  89 static void update(void)
  90 {
  91         int32_t fwd[2], right[2];
  92         uint16_t input;
  93
  94         input = ~REG_KEYINPUT;
  95
  96         if(input & BN_LT) angle += TURN_SPEED;
  97         if(input & BN_RT) angle -= TURN_SPEED;
  98
  99         fwd[0] = -SIN(angle);
 100         fwd[1] = COS(angle);
 101         right[0] = fwd[1];
 102         right[1] = -fwd[0];
 103
 104         if(input & BN_UP) {
 105                 pos[0] += fwd[0];
 106                 pos[1] += fwd[1];
 107         }
 108         if(input & BN_DOWN) {
 109                 pos[0] -= fwd[0];
 110                 pos[1] -= fwd[1];
 111         }
 112         if(input & BN_RIGHT) {
 113                 pos[0] += right[0];
 114                 pos[1] += right[1];
 115         }
 116         if(input & BN_LEFT) {
 117                 pos[0] -= right[0];
 118                 pos[1] -= right[1];
 119         }
 120
 121         vox_view(vox, pos[0], pos[1], -30, angle);
 122 }
 123
 124 static void draw(void)
 125 {
 126         vox_render(vox);
 127         vox_sky_grad(vox, COLOR_HORIZON, COLOR_ZENITH);
 128 }
 129
 130 #ifdef BUILD_GBA
 131 __attribute__((noinline, target("arm"), section(".iwram")))
 132 #endif
 133 static void gamescr_vblank(void)
 134 {
 135         num_vbl++;
 136 }