private GamePlayContentManager()
 {
     drawManager = GamePlayDrawManager.GetInstance();
     inputManager = GamePlayInputManager.GetInstance();
     logicManager = GamePlayLogicManager.GetInstance();
     playerManager = PlayerManager.GetInstance();
 }
 public static GamePlayInputManager GetInstance()
 {
     if (instance == null)
         instance = new GamePlayInputManager();
     return instance;
 }