Need to build an engine for an OpenGL GUI. Thinking about using CELL and LEAF, but leave some room to build it in EX too. * Layout engine: translate a heriarchical GUI description to an on-screen layout. * Event dispatcher: focus on the hard problem: editable graphs. Roadmap: 1. OpenGL window context with mouse/keyboard events. 2. Layout engine for knobs, sliders, LCDs and grouping boxes.