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 "voxscape.h"
  15 #include "data.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 int32_t pos[2], angle;
  37 static struct voxscape *vox;
  38
  39 #define COLOR_HORIZON   192
  40 #define COLOR_ZENITH    255
  41
  42
  43
  44 struct screen *init_game_screen(void)
  45 {
  46         return &gamescr;
  47 }
  48
  49 static int gamescr_start(void)
  50 {
  51         int i;
  52
  53         gba_setmode(4, DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1);
  54
  55         vblperf_setcolor(0);
  56
  57         pos[0] = pos[1] = 256 << 16;
  58
  59         if(!(vox = vox_create(512, 512, height_pixels, color_pixels))) {
  60                 panic(get_pc(), "vox_create");
  61         }
  62         vox_proj(vox, 45, 10, 100);
  63
  64         /* setup color image palette */
  65         for(i=0; i<192; i++) {
  66                 int r = color_cmap[i * 3];
  67                 int g = color_cmap[i * 3 + 1];
  68                 int b = color_cmap[i * 3 + 2];
  69                 gba_bgpal[i] = (((uint16_t)b << 7) & 0x7c00) | (((uint16_t)g << 2) & 0x3e0) | (((uint16_t)r >> 3) & 0x1f);
  70         }
  71
  72         /* setup sky gradient palette */
  73         for(i=0; i<64; i++) {
  74                 int t = (i << 8) / 64;
  75                 int r = (0xcc00 + (0x55 - 0xcc) * t) >> 8;
  76                 int g = (0x7700 + (0x88 - 0x77) * t) >> 8;
  77                 int b = (0xff00 + (0xcc - 0xff) * t) >> 8;
  78                 int cidx = COLOR_HORIZON + i;
  79                 gba_bgpal[cidx] = ((b << 7) & 0x7c00) | ((g << 2) & 0x3e0) | (r >> 3);
  80         }
  81
  82         nframes = 0;
  83         return 0;
  84 }
  85
  86 static void gamescr_stop(void)
  87 {
  88 }
  89
  90 static void gamescr_frame(void)
  91 {
  92         unsigned char *fb;
  93
  94         backbuf = ++nframes & 1;
  95         fb = (unsigned char*)vram[backbuf];
  96
  97         vox_framebuf(vox, 240, 160, fb, -1);
  98
  99         update();
 100         draw();
 101
 102         vblperf_end();
 103         wait_vblank();
 104         present(backbuf);
 105         vblperf_begin();
 106 }
 107
 108 #define WALK_SPEED      0x40000
 109 #define TURN_SPEED      0x100
 110
 111 static void update(void)
 112 {
 113         int32_t fwd[2], right[2];
 114         uint16_t input;
 115
 116         if((input = read_input())) {
 117
 118                 if(input & BN_LT) angle += TURN_SPEED;
 119                 if(input & BN_RT) angle -= TURN_SPEED;
 120
 121                 fwd[0] = -SIN(angle);
 122                 fwd[1] = COS(angle);
 123                 right[0] = fwd[1];
 124                 right[1] = -fwd[0];
 125
 126                 if(input & BN_UP) {
 127                         pos[0] += fwd[0];
 128                         pos[1] += fwd[1];
 129                 }
 130                 if(input & BN_DOWN) {
 131                         pos[0] -= fwd[0];
 132                         pos[1] -= fwd[1];
 133                 }
 134                 if(input & BN_RIGHT) {
 135                         pos[0] += right[0];
 136                         pos[1] += right[1];
 137                 }
 138                 if(input & BN_LEFT) {
 139                         pos[0] -= right[0];
 140                         pos[1] -= right[1];
 141                 }
 142
 143                 vox_view(vox, pos[0], pos[1], -30, angle);
 144         }
 145 }
 146
 147 static void draw(void)
 148 {
 149         vox_render(vox);
 150         //vox_sky_grad(vox, COLOR_HORIZON, COLOR_ZENITH);
 151         vox_sky_solid(vox, COLOR_ZENITH);
 152 }
 153
 154 #ifdef BUILD_GBA
 155 __attribute__((noinline, target("arm"), section(".iwram")))
 156 #endif
 157 static void gamescr_vblank(void)
 158 {
 159         num_vbl++;
 160 }