MFC Gameloop

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///////////////////////////////////////////////////////////////////////////////// Run()		int cl_BdGameApp::Run()		{			MSG msg; // message			while(1)			{				if(m_shutDown)				{					// user wants to end the game or an error occured					ExitInstance();					return 0;				}				if(PeekMessage(&msg,NULL,0,0,PM_NOREMOVE))				{					if(GetMessage(&msg,NULL,0,0) == FALSE)					{						// there was a WM_QUIT message						ExitInstance();						return msg.wParam;					}					// WM_KEYUP					if(msg.message == WM_KEYUP &&					   (msg.wParam == VK_ESCAPE || msg.wParam == VK_F4))					{						switch(msg.wParam)						{							case VK_ESCAPE:								// quit app								PostQuitMessage(0);								break;							case VK_F4:								// toggle fullscreen								m_pGame->ToggleFullscreen();								break;						}					}					else					{						TranslateMessage(&msg);						DispatchMessage(&msg);					}				}				else				{					if(m_pGameWnd->IsActive())					{						m_pGame->Activate();						if(m_pGameWnd->MustRedraw())						{							m_pGame->Restore();							// we've to redraw the screen - in cause							// of resizing, inactivity...							m_pGameWnd->SetRedrawScreen(false);						}						// draw next frame of the game						float timeDiff = m_pGame->GetTimer()->GetFrameTime();						if(!m_pGame->UpdateFrame( timeDiff ))							AfxGetMainWnd()->PostMessage(WM_CLOSE,0,0);						m_fps = 1.0 / timeDiff;#ifdef _DEBUG						TRACE1("m_fps: %d\n",m_fps);#endif					}					else					{						m_pGame->Pause();						WaitMessage();					}				}			}		}

///////////////////////////////////////////////////////////////////////////////// UpdateFrame()bool cl_JunkFoodAttack::UpdateFrame( const float timeDiff ){	if(!cl_BdGame::UpdateFrame( timeDiff ))		return false;	// clear backbuffer with black color	m_pDD->ClearBackBuffer();	switch(m_gameState)	{	case GS_INIT_MAINMENU:		// release old module		if(m_pActiveModule)			delete m_pActiveModule;		// build main menu module		m_pActiveModule = new cl_MainMenu(this);		if(!m_pActiveModule)			return false;		if(!m_pActiveModule->InitInstance())			return false;		m_gameState = GS_MAINMENU;		break;	case GS_INIT_GAME:		if(m_pActiveModule)			delete m_pActiveModule;		m_pActiveModule = new cl_InGame(this);		if(!m_pActiveModule)			return false;		if(!m_pActiveModule->InitInstance())			return false;		m_gameState = GS_INGAME;		break;	case GS_INIT_ENTER_NAME:		// release old module		if(m_pActiveModule)			delete m_pActiveModule;		// build new name entry module		m_pActiveModule = new cl_NameEntry(this);		if(!m_pActiveModule)			return false;		if(!m_pActiveModule->InitInstance())			return false;		m_gameState = GS_ENTER_NAME;		break;	case GS_EXIT_GAME:		return false;	}	if(m_gameState == GS_MAINMENU ||	   m_gameState == GS_INGAME ||	   m_gameState == GS_ENTER_NAME)	{		if(m_pActiveModule)			if(!m_pActiveModule->UpdateFrame( timeDiff ))				return false;	}#ifdef _DEBUG	// render fps	int fps = 1.0 / timeDiff;		cl_BdFont* pFont;	if((pFont = GetFont("FONT_BD")) == NULL)		return false;		char cfps[256];	sprintf(cfps,"FPS: %d",fps);	std::string sfps(cfps);	pFont->DrawAligned(sfps,		cl_BdFont::EN_LEFT,		0);#endif	// flip the shit	return m_pDD->Flip();}