OpenGL
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OpenGL is a 3D graphics API, which is used by the hardware renderers of 
GoldSrc and 
id Tech 2, as well as some 
Source 2 games. The 
Linux and 
macOS versions of 
Source can use the special-purpose togl to wrap DirectX API calls to OpenGL (although togl is limited to Shader Model 2).
Source engine OpenGL
Dxlevel 92
Dxlevel 92 is the OpenGL equivalent to DirectX 9 (Dx9)
Features
- Refractions with the use of a bump-map
- High-quality reflective water (used frequently)
- Softer edge dynamic shadows
- Normal-mapped lighting on models
- Improved-quality specular effects
- High dynamic range rendering (disabled by default)
- Phong shading
- Color Correction
- Motion Blur
Dxlevel 97
Dxlevel 92 is the OpenGL equivalent to DirectX 9 (Dx9)
Features
- Lightwarp support
- High dynamic range rendering (enabled by default)
