Valve has made Dota 2's Direct3D to OpenGL translation layer open source. This is the piece of code that allows Valve to take a standard DirectX Windows game that uses the Source engine (Dota 2 ...

Rewritten OpenGL drivers make AMD’s GPUs “up to 72%” faster in some pro apps AMD previewed new OpenGL drivers for consumer Radeon GPUs earlier this year.

Valve releases open source Direct3D to OpenGL translator It should aid porting Windows games to other platforms, but it won't be revolutionary.