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