* clutter/clutter-element.h:
Add missing _depth() declarations
* clutter/clutter-main.c:
* clutter/clutter-main.h:
* clutter/clutter-private.h:
* clutter/clutter-stage.c:
* clutter/clutter-stage.h:
Rejig GL setup as for stage to support an offscreen property.
Offscreen support is however a little borked.