public void Cleanup()
        {
            OpenGl32.WglMakeCurrent(_deviceContext, IntPtr.Zero);
            OpenGl32.WglDeleteContext(_openGlContext);

            WindowExtensions.Cleanup();
        }
 public void Cleanup()
 {
     OpenGl.GlXMakeCurrent(_window.NativeHandle, 0, IntPtr.Zero);
     OpenGl.GlXDestroyContext(_window.NativeHandle, _contextPtr);
     WindowExtensions.Cleanup();
 }