CODE:

//	画像リソース管理
struct GraphicResource {
private :
	int m_handle;
	int m_initialized;
	const char* m_filepath;
public :
	GraphicResource(){
		m_handle = 0;
		m_initialized = false;
		m_filepath = NULL;
	}
	~GraphicResource(){
		APP_ASSERT( !m_initialized );
	}

	// ロード処理
	void load( const char* filepath ){
		if( !filepath ) return;
		SetUseASyncLoadFlag( TRUE )    // 非同期読み込みON
		m_filepath = filepath;                // ファイルパスを指定して
		m_handle   = LoadGraph( m_filepath ); // ロード開始
	}

	// ロードの同期をとる
	bool loadSync(){
		int result = CheckHandleASyncLoad( m_handle );
		if( result == 1 ) return false;  // 1は読み込み中らしい
		if( result == 0 ){               // 0が返ってきたら正常終了
			m_initialized = true;
			return true;   
		}
		//	それ以外の値が返ってきたら異常である
		APP_PRINT( "LoadGraph Failed [m_handle %d][m_filepath %s] \n" , m_handle , m_filepath );
		return false;
	}

	// 終了処理
	void finalize(){
		if( m_initialized ){
			m_initialized = false;
			DeleteGraph( m_handle );
		}
	}

	// 画像ハンドル取得
	const int& getHandle(){
		return m_handle;
	}
};

CODE:

SetUseASyncLoadFlag

CODE:

CheckHandleASyncLoad

CODE:

//	シーン管理
class Scene {
private :
	unsigned int m_frametime;
	int m_state;
	int m_statenext;
	bool m_isfirst;
public :
	enum {
		STATE_NONE = 0 ,
		STATE_INITIALIZE , 
		STATE_LOAD , 
		STATE_SYNC , 
		STATE_SETUP , 
		STATE_PROCESS ,
		STATE_NUM
	};

	Scene(){
		m_frametime = 0;
		m_state     = STATE_NONE;
		m_statenext = STATE_INITIALIZE;
		m_isfirst   = false;
	}
	virtual ~Scene(){
	}

	void changeState( int statenext ){
		m_statenext = statenext;
	}

	virtual void update(){
		if( m_statenext != m_state ){
			m_state     = m_statenext;
			m_isfirst   = true;
			m_frametime = 0;
		}

		switch ( m_state ){
		case STATE_INITIALIZE : 
			initialize(); 
			changeState( STATE_LOAD );
			break;
		case STATE_LOAD :
			load();
			changeState( STATE_SYNC );
			break;
		case STATE_SYNC :
			if( !sync() ) break;
			changeState( STATE_SETUP );
			break;
		case STATE_SETUP :
			setup();
			changeState( STATE_PROCESS );
			break;
		case STATE_PROCESS :
			process();
			break;
		}
                m_isfirst = false;
		m_frametime++;
	}
	virtual void initialize() {}
	virtual void load(){}
	virtual bool sync(){}
	virtual void setup(){}
	virtual void process(){}
};

CODE:

// 画像読み込み処理サンプル
class MainScene : public Scene {
private :
	GraphicResource m_gRes_1;
	GraphicResource m_gRes_2;
	GraphicResource m_gRes_3;
	GraphicResource m_gRes_4;
public :
	~MainScene(){
		m_gRes_1.finalize();
		m_gRes_2.finalize();
		m_gRes_3.finalize();
		m_gRes_4.finalize();
	}

	virtual void initialize(){
	}

	virtual void load(){
		m_gRes_1.load( "img/01.png" );
		m_gRes_2.load( "img/02.png" );
		m_gRes_3.load( "img/03.png" );
		m_gRes_4.load( "img/04.png" );
	}

	virtual bool sync(){
		if( !m_gRes_1.loadSync() ) return false;
		if( !m_gRes_2.loadSync() ) return false;
		if( !m_gRes_3.loadSync() ) return false;
		if( !m_gRes_4.loadSync() ) return false;
		return true;
	}

	virtual void setup(){
	}

	virtual void process(){
		DrawGraph( 0 , 0 , m_gRes_1.getHandle() , TRUE );
	}
};