// Replace screenHeight, screenWidth and hWnd with your globals// or whatever that contain the height and width of your window// and the HWND of your windowstruct MousePosition {	int	x, y, z;};MousePosition GetMousePosition() {	MousePosition m;	RECT wndRect;	POINT mousePos;	GetWindowRect(hWnd, &wndRect);	GetCursorPos(&mousePos);	mousePos.x -= wndRect.left;	// These are the lines that account for the position of your window	mousePos.y -= wndRect.top;	mousePos.x-=4;		// UGLY HACK!! Account for left border	mousePos.y-=23;		// UGLY HACK!! Account for top of window	if (mousePos.x < 0) mousePos.x = 0;	// Don''t let it go off the left	if (mousePos.y < 0) mousePos.y = 0;	// Don''t let it go off the top	if (mousePos.x > screenWidth) mousePos.x = screenWidth; 	// Don''t let it go off the right	if (mousePos.y > screenHeight) mousePos.y = screenHeight;	// Don''t let it go off the bottom	mousePos.y = screenHeight - mousePos.y; // To return the bottom left pixel as (0,0), which is how OpenGL treats it.	m.x = mousePos.x;	m.y = mousePos.y;	m.z = 0;	return m;}