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
  21 static void update(void);
  22 static void draw(void);
  23
  24 static struct screen gamescr = {
  25         "game",
  26         gamescr_start,
  27         gamescr_stop,
  28         gamescr_frame,
  29         0
  30 };
  31
  32 static int nframes, num_vbl, backbuf;
  33 static uint16_t *vram[] = { gba_vram_lfb0, gba_vram_lfb1 };
  34
  35 static int32_t pos[2], angle;
  36 static struct voxscape *vox;
  37
  38 #define COLOR_HORIZON   0x7dd9
  39 #define COLOR_ZENITH    0x662a
  40
  41
  42
  43 struct screen *init_game_screen(void)
  44 {
  45         return &gamescr;
  46 }
  47
  48 static int gamescr_start(void)
  49 {
  50         gba_setmode(5, DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1);
  51
  52         vblperf_setcolor(0);
  53
  54         pos[0] = pos[1] = VOX_SZ << 15;
  55
  56         if(!(vox = vox_create(VOX_SZ, VOX_SZ, height_pixels, color_pixels))) {
  57                 panic(get_pc(), "vox_create");
  58         }
  59         vox_proj(vox, 45, 2, VOX_SZ / 5);
  60
  61         nframes = 0;
  62         return 0;
  63 }
  64
  65 static void gamescr_stop(void)
  66 {
  67 }
  68
  69 static void gamescr_frame(void)
  70 {
  71         unsigned char *fb;
  72
  73         backbuf = ++nframes & 1;
  74         fb = (unsigned char*)vram[backbuf];
  75
  76         vox_framebuf(vox, 160, 128, fb, -1);
  77
  78         update();
  79         draw();
  80
  81         vblperf_end();
  82         wait_vblank();
  83         present(backbuf);
  84
  85         if(!(nframes & 15)) {
  86                 emuprint("vbl: %d", vblperf_count);
  87         }
  88 #ifdef VBLBAR
  89         vblperf_begin();
  90 #else
  91         vblperf_count = 0;
  92 #endif
  93 }
  94
  95 #define WALK_SPEED      0x40000
  96 #define TURN_SPEED      0x200
  97
  98 static void update(void)
  99 {
 100         int32_t fwd[2], right[2];
 101         uint16_t input;
 102
 103         if((input = read_input())) {
 104
 105                 if(input & BN_LT) angle += TURN_SPEED;
 106                 if(input & BN_RT) angle -= TURN_SPEED;
 107
 108                 fwd[0] = -SIN(angle);
 109                 fwd[1] = COS(angle);
 110                 right[0] = fwd[1];
 111                 right[1] = -fwd[0];
 112
 113                 if(input & BN_UP) {
 114                         pos[0] += fwd[0];
 115                         pos[1] += fwd[1];
 116                 }
 117                 if(input & BN_DOWN) {
 118                         pos[0] -= fwd[0];
 119                         pos[1] -= fwd[1];
 120                 }
 121                 if(input & BN_RIGHT) {
 122                         pos[0] += right[0];
 123                         pos[1] += right[1];
 124                 }
 125                 if(input & BN_LEFT) {
 126                         pos[0] -= right[0];
 127                         pos[1] -= right[1];
 128                 }
 129
 130                 vox_view(vox, pos[0], pos[1], -30, angle);
 131         }
 132 }
 133
 134 static void draw(void)
 135 {
 136         vox_render(vox);
 137         vox_sky_grad(vox, COLOR_HORIZON, COLOR_ZENITH);
 138         //vox_sky_solid(vox, COLOR_ZENITH);
 139 }