the gtk.Widget to be used as the rendering area.
the gdk.GLContext with which to share display lists and texture objects. NULL indicates that no sharing is to take place.
whether rendering is to be done with a direct connection to the graphics system.
GDK_GL_RGBA_TYPE.
Return: TRUE if it is successful, FALSE otherwise.
Set the OpenGL-capability to the widget. This function prepares the widget for its use with OpenGL.