This. (BTW, I'm the author, sorry.) Although the renderer is GL 2.X based -- it supports OpenGL 3+ features using extensions. It was written against OpenGL 2.X

This. (BTW, I'm the author, sorry.) Although the renderer is GL 2.X based -- it supports OpenGL 3+ features using extensions. It was written against OpenGL 2.X so that the lowest OpenGL 3 hardware could be targeted.