Add cube GtkGL example
[grits] / HACKING
1 For Grits development:
2   - http://pileus.org/grits
3
4 For OpenGL programming:
5   - http://www.opengl.org/sdk/docs/man/
6   - http://www.glprogramming.com/red/
7   - http://www.glprogramming.com/blue/