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static const char bird_hero[] = "bird/bird_hero.png";
static const char bird_hero2[] = "bird/bird_hero2.png";
static const char bird_hero3[] = "bird/bird_hero3.png";
static const char bird_logo[] = "bird/bird_logo.png";
static const char bird_bg[] = "bird/bird_bg.png";
static const char bird_obstacle_up[] = "bird/obstacle_up.png";
static const char bird_obstacle_down[] = "bird/obstacle_down.png";
static const char bird_start_btn[] = "bird/bird_start_btn.png";
static const char bird_start_btn_pressed[] = "bird/brid_start_btn_pressed.png";
static const char bird_gameover[] = "bird/bird_gameover.png";

static const int TAG_LOGO = 1000;
static const int TAG_START_BTN= 1001;
static const int TAG_HERO = 1002; 
static const int TAG_OVER = 1003;
static const int TAG_SCORE = 1004;

static const int GAME_STATUS_START = 10;
static const int GAME_STATUS_PLAYING = 20;
static const int GAME_STATUS_GAME_OVER = 30;
static const int GAME_STATUS_RESTART = 40;