RE: OpenGL rendering onto a widget

To answer my own question, currently the cleanest way to go about it seems to be using the Clutter scene graph library.
By means of 'GtkClutter' (package name) you get a new GTK widget, GtkClutterEmbed. This widget is added to the interface of your program like other GTK widgets such as buttons, panels etc. 

With this GtkClutterEmbed widget you can add a Clutter stage to it, and to this stage actor objects such as a Cairo context with the ClutterCanvas object and another actor that is painted with the high level Cogl API.

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