OpenGL

Stub

This article or section is a stub. You can help by expanding it.

Todo: Write about custom OpenGL renderer in Xash3D/ Paranoia/ Cry of Fear and etc. ( Counter-Strike Neo?^[Clarify])

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

Id Tech 2 Engine (GLQuake) OpenGL

Screenshot in-game of Quake GLQuake^[1][2], using OpenGL.

Features

• Experimented Reflections
• Transparent Water
• Rudimentary Shadows

Note:To enables Rudimentary Shadows r_shadows must be set to 1

Note:Rudimentary Shadows in Half-Life were add in the 25th Anniversary update.

• Texture Filtering
• Water ripple
• 32-bit color
• Support for different resolutions

GoldSrc OpenGL

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

Features

• Colored lighting - Quake simply had monotone lighting
• Transparent textures - Glass can now be used in maps
• Water waves

Note:Water ripple from Quake replace by Water waves but not in Software Renderer the water ripple is used.

• Texture Filtering - Quake (GLQuake) simply Texture Filtering

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 with borderless windowed.
• MSAA anti-aliasing - GoldSrc now natively support anti-aliasing, specifically, MSAA 4X, which is enabled by default on most modern hardwares. This will reduce the amount of jagged edges/staircases effect on the geometry.

Since 25th Anniversary

• Rudimentary Shadows

Note:To enables Rudimentary Shadows r_shadows must be set to 1

Source engine OpenGL

OpenGL uses togl converts DirectX shaders to OpenGL for macOS and Linux

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 97 is the OpenGL equivalent to DirectX 9 Shader Model 3 (Dx9.0c)

Features

• Lightwarp support
• High dynamic range rendering (enabled by default)

See also

• Direct3D
• Vulkan
• Software renderer

External links

•  OpenGL

References

Wikipedia for Quake

Quake Fandom wiki

DirectX_Versions