OpenGL

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OpenGL is a 3D graphics API, which is used by the hardware renderers of GoldSrc GoldSrc and id Tech 2 id Tech 2, as well as some Source 2 Source 2 games. The Linux Linux and macOS macOS versions of Source Source can use the special-purpose togl to wrap DirectX API calls to OpenGL (although togl is limited to Shader Model 2).

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