Valve has publushed Direct3D -> OpenGL translation layer

[Alexander Rechitskiy]

Valve has publushed Direct3D -> OpenGL translation layer with BSD like license

https://github.com/ValveSoftware/ToGL

Taken directly from the DOTA2 source tree; supports:

Limited subset of Direct3D 9.0c
Bytecode-level HLSL -> GLSL translator
Some SM3 support: Multiple Render Targets, no Vertex Texture Fetch
This most likely won't build by itself and is provided as-is and completely unsupported. Feel free to use it for your reference, incorporate it into your projects or send us modifications.

Be wary that some parts are hardcoded to match Source Engine behavior; see CentroidMaskFromName() and ShadowDepthSamplerMaskFromName() in dxabstract.cpp.

Please refer to the LICENSE file for more information.
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Best regards
Alexander Rechitskiy