I've heard that it is possible to make a high performance computer with a rasberry pi cluster. I am thinking about doing this, but before I do it, I want to know what OpenGL version rasberry pi supports. (If it matters, the OS that I plan to install is ubuntu linux)
The GPU supports GLES2.0 plus a couple of additional features. With the open driver (enable it with raspi-config), you get GLES 2.0, and GL 2.1 with a few rarely-used features missing.
I believe it is OpenGL 2.1. See here.