docs/postprocess.html

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  10 <h1>Gallium Post-processing</h1>
  11
  12 <p>
  13 The Gallium drivers support user-defined image post-processing.
  14 At the end of drawing a frame a post-processing filter can be applied to
  15 the rendered image.
  16 Example filters include morphological antialiasing and cell shading.
  17 </p>
  18
  19 <p>
  20 The filters can be toggled per-app via driconf, or per-session via the
  21 corresponding environment variables.
  22 </p>
  23
  24 <p>
  25 Multiple filters can be used together.
  26 </p>
  27
  28
  29 <h2>PP environment variables</h2>
  30
  31 <ul>
  32 <li>PP_DEBUG - If defined debug information will be printed to stderr.
  33 </ul>
  34
  35 <h2>Current filters</h2>
  36
  37 <ul>
  38 <li>pp_nored, pp_nogreen, pp_noblue - set to 1 to remove the corresponding color channel.
  39 These are basic filters for easy testing of the PP queue.
  40 <li>pp_jimenezmlaa, pp_jimenezmlaa_color -
  41 <a href="http://www.iryokufx.com/mlaa/" target=_blank>Jimenez's MLAA</a>
  42 is a morphological antialiasing filter.
  43 The two versions use depth and color data, respectively.
  44 Which works better depends on the app - depth will not blur text, but it will
  45 miss transparent textures for example.
  46 Set to a number from 2 to 32, roughly corresponding to quality.
  47 Numbers higher than 8 see minimizing gains.
  48 <li>pp_celshade - set to 1 to enable cell shading (a more complex color filter).
  49 </ul>
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