docs/postprocess.html

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  11   The Mesa 3D Graphics Library
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  17 <h1>Gallium Post-processing</h1>
  18
  19 <p>
  20 The Gallium drivers support user-defined image post-processing.
  21 At the end of drawing a frame a post-processing filter can be applied to
  22 the rendered image.
  23 Example filters include morphological antialiasing and cell shading.
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  26 <p>
  27 The filters can be toggled per-app via driconf, or per-session via the
  28 corresponding environment variables.
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  31 <p>
  32 Multiple filters can be used together.
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  35
  36 <h2>PP environment variables</h2>
  37
  38 <ul>
  39 <li>PP_DEBUG - If defined debug information will be printed to stderr.
  40 </ul>
  41
  42 <h2>Current filters</h2>
  43
  44 <ul>
  45 <li>pp_nored, pp_nogreen, pp_noblue - set to 1 to remove the corresponding color channel.
  46 These are basic filters for easy testing of the PP queue.
  47 <li>pp_jimenezmlaa, pp_jimenezmlaa_color -
  48 <a href="https://www.iryokufx.com/mlaa/" target=_blank>Jimenez's MLAA</a>
  49 is a morphological antialiasing filter.
  50 The two versions use depth and color data, respectively.
  51 Which works better depends on the app - depth will not blur text, but it will
  52 miss transparent textures for example.
  53 Set to a number from 2 to 32, roughly corresponding to quality.
  54 Numbers higher than 8 see minimizing gains.
  55 <li>pp_celshade - set to 1 to enable cell shading (a more complex color filter).
  56 </ul>
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