gistfile1.cpp

bool b_mouse_controlled = false;
float mouse_sensitivity = 0.001f;
Vector3f camera_target;
...

case WM_MOUSEMOVE:	
			// ignorovat eventy pokud je zdrojem posunu SetCursorPos
			if (!b_mouse_controlled) {
				GLint viewport[4];
				glGetIntegerv(GL_VIEWPORT, viewport);	// x, y, w, h  okna

				// stred okna
				POINT center;
				center.x = viewport[2] / 2;
				center.y = viewport[3] / 2;				

				// odchyleni od stredu okna
				int dx = LOWORD(n_l_param) - center.x;
				int dy = HIWORD(n_l_param) - center.y;
								
				if(dx || dy) {
					// zmenit pohled kamery; souradnice Y musi byt invertovana
					camera_target += Vector3f(dx * mouse_sensitivity, -dy * mouse_sensitivity, 0);
					
					b_mouse_controlled = true; // pristi event chceme ignorovat
					ClientToScreen(h_wnd, &center); // chceme nastavit pozici relativne k oknu
					SetCursorPos(center.x, center.y);
				}
			} else {
				b_mouse_controlled = false;
			}			
			return 0;