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(5, DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1);
  54
  55         vblperf_setcolor(0);
  56
  57         pos[0] = pos[1] = VOX_SZ << 15;
  58
  59         if(!(vox = vox_create(VOX_SZ, VOX_SZ, height_pixels, color_pixels))) {
  60                 panic(get_pc(), "vox_create");
  61         }
  62         vox_proj(vox, 45, 2, VOX_SZ / 5);
  63
  64         nframes = 0;
  65         return 0;
  66 }
  67
  68 static void gamescr_stop(void)
  69 {
  70 }
  71
  72 static void gamescr_frame(void)
  73 {
  74         unsigned char *fb;
  75
  76         backbuf = ++nframes & 1;
  77         fb = (unsigned char*)vram[backbuf];
  78
  79         vox_framebuf(vox, 160, 128, fb, -1);
  80
  81         update();
  82         draw();
  83
  84         vblperf_end();
  85         wait_vblank();
  86         present(backbuf);
  87
  88         if(!(nframes & 15)) {
  89                 emuprint("vbl: %d", vblperf_count);
  90         }
  91         vblperf_begin();
  92 }
  93
  94 #define WALK_SPEED      0x40000
  95 #define TURN_SPEED      0x100
  96
  97 static void update(void)
  98 {
  99         int32_t fwd[2], right[2];
 100         uint16_t input;
 101
 102         if((input = read_input())) {
 103
 104                 if(input & BN_LT) angle += TURN_SPEED;
 105                 if(input & BN_RT) angle -= TURN_SPEED;
 106
 107                 fwd[0] = -SIN(angle);
 108                 fwd[1] = COS(angle);
 109                 right[0] = fwd[1];
 110                 right[1] = -fwd[0];
 111
 112                 if(input & BN_UP) {
 113                         pos[0] += fwd[0];
 114                         pos[1] += fwd[1];
 115                 }
 116                 if(input & BN_DOWN) {
 117                         pos[0] -= fwd[0];
 118                         pos[1] -= fwd[1];
 119                 }
 120                 if(input & BN_RIGHT) {
 121                         pos[0] += right[0];
 122                         pos[1] += right[1];
 123                 }
 124                 if(input & BN_LEFT) {
 125                         pos[0] -= right[0];
 126                         pos[1] -= right[1];
 127                 }
 128
 129                 vox_view(vox, pos[0], pos[1], -30, angle);
 130         }
 131 }
 132
 133 static void draw(void)
 134 {
 135         vox_render(vox);
 136         //vox_sky_grad(vox, COLOR_HORIZON, COLOR_ZENITH);
 137         vox_sky_solid(vox, COLOR_ZENITH);
 138 }
 139
 140 ARM_IWRAM
 141 static void gamescr_vblank(void)
 142 {
 143         num_vbl++;
 144 }