title: Is it possible to hack GTK to render to OpenGL texture
body: <p>I'm writing an OpenGL game, and want native looking GUI elements. I was wondering if anyone has successfully hacked GTK+ using <code>GtkOffscreenWindow</code> and <code>gtk_offscreen_window_get_pixbuf</code> to render to an OpenGL texture, and whether this would have reasonable performance, considering repeated re-uploading of texture data every time the GUI is updated</p>