// the main windows entry pointint WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd){	WNDCLASSEX windowClass;		// window class	HWND	   hwnd;			// window handle	MSG		   msg;				// message	bool	   done;			// flag saying when our app is complete	DWORD	   dwExstyle;						// Window Extended style	DWORD	   dwstyle;						// Window style	RECT	   windowRect;	// temp var's	int width = 800;	int height = 600;	int bits = 32;	//fullScreen = TRUE;	windowRect.left=(long)0;						// Set Left Value To 0	windowRect.right=(long)width;						// Set Right Value To Requested Width	windowRect.top=(long)0;							// Set Top Value To 0	windowRect.bottom=(long)height;						// Set Bottom Value To Requested Height	// fill out the window class structure	windowClass.cbSize			= sizeof(WNDCLASSEX);	windowClass.style			= CS_HREDRAW | CS_VREDRAW;	windowClass.lpfnWndProc		= WndProc;	windowClass.cbClsExtra		= 0;	windowClass.cbWndExtra		= 0;	windowClass.hInstance		= hInstance;	windowClass.hIcon			= LoadIcon(NULL, IDI_APPLICATION);	// default icon	windowClass.hCursor			= LoadCursor(NULL, IDC_ARROW);		// default arrow	windowClass.hbrBackground	= NULL;								// don't need background	windowClass.lpszMenuName	= NULL;								// no menu	windowClass.lpszClassName	= "MyClass";	windowClass.hIconSm			= LoadIcon(NULL, IDI_WINLOGO);		// windows logo small icon	// register the windows class	if (!RegisterClassEx(&windowClass))		return 0;	if (fullScreen)								// fullscreen?	{		DEVMODE dmScreenSettings;					// device mode		memset(&dmScreenSettings,0,sizeof(dmScreenSettings));		dmScreenSettings.dmSize = sizeof(dmScreenSettings);			dmScreenSettings.dmPelsWidth = width;			// screen width		dmScreenSettings.dmPelsHeight = height;			// screen height		dmScreenSettings.dmBitsPerPel = bits;				// bits per pixel		dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;		// 		if (ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL)		{			// setting display mode failed, switch to windowed			MessageBox(NULL, "Display mode failed", NULL, MB_OK);			fullScreen=FALSE;			}	}	if (fullScreen)								// Are We Still In Fullscreen Mode?	{		dwExstyle=WS_EX_APPWINDOW;					// Window Extended style		dwstyle=WS_POPUP;						// Windows style		ShowCursor(FALSE);						// Hide Mouse Pointer	}	else	{		dwExstyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;			// Window Extended style		dwstyle=WS_OVERLAPPEDWINDOW;					// Windows style	}	AdjustWindowRectEx(&windowRect, dwstyle, FALSE, dwExstyle);		// Adjust Window To True Requested Size	// class registered, so now create our window	hwnd = CreateWindowEx(NULL,									// extended style						  "MyClass",							// class name						  "OpenGL Robot",		// app name						  dwstyle | WS_CLIPCHILDREN |						  WS_CLIPSIBLINGS,						  0, 0,								// x,y coordinate						  windowRect.right - windowRect.left,						  windowRect.bottom - windowRect.top, // width, height						  NULL,									// handle to parent						  NULL,									// handle to menu						  hInstance,							// application instance						  NULL);								// no extra params	// check if window creation failed (hwnd would equal NULL)	if (!hwnd)		return 0;	ShowWindow(hwnd, SW_SHOW);			// display the window	UpdateWindow(hwnd);					// update the window	done = false;						// intialize the loop condition variable	// main message loop	while (!done)	{		PeekMessage(&msg, hwnd, NULL, NULL, PM_REMOVE);		if (msg.message == WM_QUIT)		// do we receive a WM_QUIT message?		{			done = true;				// if so, time to quit the application		}		else		{			Render();			TranslateMessage(&msg);		// translate and dispatch to event queue			DispatchMessage(&msg);		}	}	if (fullScreen)	{		ChangeDisplaySettings(NULL,0);					// If So Switch Back To The Desktop		ShowCursor(TRUE);						// Show Mouse Pointer	}	return msg.wParam;}