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5  <title>Gallium Post-processing</title>
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10<h1>Gallium Post-processing</h1>
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12<p>
13The Gallium drivers support user-defined image post-processing.
14At the end of drawing a frame a post-processing filter can be applied to
15the rendered image.
16Example filters include morphological antialiasing and cell shading.
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20The filters can be toggled per-app via driconf, or per-session via the
21corresponding environment variables.
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25Multiple filters can be used together.
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29<h2>PP environment variables</h2>
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31<ul>
32<li>PP_DEBUG - If defined debug information will be printed to stderr.
33</ul>
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35<h2>Current filters</h2>
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37<ul>
38<li>pp_nored, pp_nogreen, pp_noblue - set to 1 to remove the corresponding color channel.
39These 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>
42is a morphological antialiasing filter.
43The two versions use depth and color data, respectively.
44Which works better depends on the app - depth will not blur text, but it will
45miss transparent textures for example.
46Set to a number from 2 to 32, roughly corresponding to quality.
47Numbers higher than 8 see minimizing gains.
48<li>pp_celshade - set to 1 to enable cell shading (a more complex color filter).
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