Valve Runs a Direct3D to OpenGL Translation Layer

Digging through the source code tree of Dota 2, developers discovered Valve's latest creation, ToGL. Simply put, it's a Direct3D to OpenGL translation layer, which works to reduce duplication of effort in developing games for multiple platforms (such as Windows, Linux, and OS X). The software can translate Direct3D calls to their OpenGL analogues. So far, it can translate only certain kinds of calls within the Direct3D 9.0c API, which should fit Valve's needs adequately. It features a bytecode-level HLSL to GLSL shader language translator. It features only a limited shader model 3.0 support. ToGL is currently being provided by Valve as-is on GitHub, and is unsupported. Developers are free to incorporate it into their projects, and make modifications to it.