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11 <h1>The Mesa 3D Graphics Library</h1>
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17 <h1>Gallium Post-processing</h1>
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
23 Example filters include morphological antialiasing and cell shading.
27 The filters can be toggled per-app via driconf, or per-session via the
28 corresponding environment variables.
32 Multiple filters can be used together.
36 <h2>PP environment variables</h2>
39 <li>PP_DEBUG - If defined debug information will be printed to stderr.
42 <h2>Current filters</h2>
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="http://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).