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engines:software_vs_glquake [2011/10/29 11:19]
Spirit fixed images 		engines:software_vs_glquake [2013/02/15 17:01]
SiPlus
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 ===== Differences between software rendered Quake and GLQuake ===== ===== Differences between software rendered Quake and GLQuake =====
-Showing some differences between the original software rendered Quake (quake.exe, winquake.exe and derivates) and hardware-accelerated GLQuake (glquake.exe and derivates).+Showing some differences between the original software rendered Quake (quake.exe, winquake.exe and derivates) and hardware-accelerated GLQuake (glquake.exe and derivates). ​Use one of the [[:​quake:​recommended_engines]]!
  
-Currently written in the viewpoint of Spirit who also currently ​is the sole author ​of these. Be awesome, remove all the "​I"​s and contribute more differences!+Currently written in the viewpoint of Spirit ​and SiPlus ​who also currently ​are the sole authors ​of these. Be awesome, remove all the "​I"​s and contribute more differences!
  
 ==== Texture filtering ==== ==== Texture filtering ====
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 The options available might vary based on your graphics hardware (and maybe the engine too?). This list  is taken from the [[http://​ezquake.sourceforge.net/​docs/?​vars-texture-settings|ezQuake documentation]] (remember, ezQuake is <​em>​not</​em>​ a singleplayer engine): The options available might vary based on your graphics hardware (and maybe the engine too?). This list  is taken from the [[http://​ezquake.sourceforge.net/​docs/?​vars-texture-settings|ezQuake documentation]] (remember, ezQuake is <​em>​not</​em>​ a singleplayer engine):
  
-  * GL_NEAREST -> //Point sampled ​(software-like). Lowest quality, highest performance.//​ +  * GL_NEAREST -> //Point sampled. Lowest quality, highest performance.//​ 
-  * GL_NEAREST_MIPMAP_NEAREST -> //​GL_NEAREST but with a bit more quality for far objects.//+  * GL_NEAREST_MIPMAP_NEAREST -> //​GL_NEAREST but with a bit more quality for far objects ​(software-like).//
   * GL_NEAREST_MIPMAP_LINEAR -> //​GL_NEAREST but with even more quality for far objects.//   * GL_NEAREST_MIPMAP_LINEAR -> //​GL_NEAREST but with even more quality for far objects.//
-  * GL_LINEAR -> //No blending.// +  * GL_LINEAR -> //Bilinear interpolation.// 
-  * GL_LINEAR_MIPMAP_NEAREST -> //Bilinear interpolation.//​+  * GL_LINEAR_MIPMAP_NEAREST -> //Bilinear interpolation ​with a bit more quality for far objects.//
   * GL_LINEAR_MIPMAP_LINEAR -> //Trilinear interpolation. Highest quality, lowest performance.//​   * GL_LINEAR_MIPMAP_LINEAR -> //Trilinear interpolation. Highest quality, lowest performance.//​
  
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 {{:​engines:​nonpowerof2_texturedistortion.png?​nolink&​|}} {{:​engines:​nonpowerof2_texturedistortion.png?​nolink&​|}}
 +
 +==== Affine texture mapping ====
 +For higher performance,​ the software renderer doesn'​t perform perspective correction on alias model textures, causing noticeable artifacts on low-poly models.
 +
 +While the effects of this can be barely seen on monsters, they are very easy to spot on weapon view models.
 +
 +You can see screenshots of the issue in "​Non-square pixels"​ section.
 +
 +The 1st screenshot demonstrates affine texture mapping in software rendering mode. The texture looks skewed and is aligned differently on each pair of triangles. The pixels always have the same width and height, no matter how far they are from the player.
 +
 +The 2nd and 3rd screenshots show perspective-correct texture mapping. The metal shine is now a straight line, and distant pixels appear smaller than the close ones.
 +
 +On certain video cards, the effect can be enabled by enabling console variable "​gl_affinemodels"​.