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Blank image.pngTodo: Write about custom OpenGL renderer in Xash3D Xash3D/Paranoia Paranoia/Cry of Fear Cry of Fear and etc. (possibly also Counter-Strike Neo Counter-Strike Neo?)

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 games. It is also used on Source Source engine, for systems that doesn't support Direct3D (macOS macOS and Linux Linux), and for GLView.

id Tech 2 id Tech 2 (GLQuake) OpenGL

Blank image.pngTodo: Quake II Quake II has additional stuff that goldsrc uses

id Tech 2 id Tech 2 (GLQuake) uses OpenGL version 1.0.

Screenshot in-game of Quake Quake GLQuake, using OpenGL.


  • Experimental Reflections
  • Translucent Water
  • Stencil Shadows
Note.pngNote:To enables Stencil Shadows r_shadows must be set to 1
  • Texture Filtering
  • 32-bit color

GoldSrc GoldSrc OpenGL

GoldSrc GoldSrc uses OpenGL version 1.0 which is same version as using the id Tech 2 id Tech 2 (GLQuake).

Screenshot in-game of Half-Life Half-Life, using OpenGL.


  • Colored lighting - Quake simply had monotone lighting
  • Translucent and transparent textures - Glass can now be used in maps
  • Water waves
  • Texture Filtering - like GLQuake
  • Detail textures (since 2004)
  • Stencil Shadows (r_shadows; removed in 2003 Steam update, but re-added in 25th Anniversary update)
Since 2013 SteamPipe Update
  • FBO renderer - A new method of rendering the game, which allows MSAA to work with GoldSrc engine. This also allows the game to run on fullscreen in a borderless window.
  • MSAA anti-aliasing - GoldSrc now natively performs 4x MSAA, reducing the amount of jagged edges/staircase effect on the geometry. This is automatically enabled when using the FBO renderer, unless the -nomsaa Command-line option is used.

Source Source engine OpenGL

OpenGL uses ToGL to convert DirectX shaders to OpenGL for macOS and Linux and uses OpenGL version 2.1 which is similar to DirectX 9.0c. Additionally, Hammer uses OpenGL to render the 2D and 3D viewports.

Dxlevel 92

Dxlevel 92 is Source's OpenGL equivalent to DirectX 9 Shader Model 3 (Dx9.0c)


  • Lightwarp support
  • High dynamic range rendering (enabled by default)
  • 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
  • Phong shading
  • Color Correction
  • Motion Blur

See also

External links