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Gallium Post-processing
=======================
The Gallium drivers support user-defined image post-processing. At the
end of drawing a frame a post-processing filter can be applied to the
rendered image. Example filters include morphological antialiasing and
cell shading.
The filters can be toggled per-app via driconf, or per-session via the
corresponding environment variables.
Multiple filters can be used together.
PP environment variables
------------------------
- PP_DEBUG - If defined debug information will be printed to stderr.
Current filters
---------------
- pp_nored, pp_nogreen, pp_noblue - set to 1 to remove the
corresponding color channel. These are basic filters for easy testing
of the PP queue.
- pp_jimenezmlaa, pp_jimenezmlaa_color - `Jimenez's
MLAA <https://www.iryoku.com/mlaa/>`__ is a morphological
antialiasing filter. The two versions use depth and color data,
respectively. Which works better depends on the app - depth will not
blur text, but it will miss transparent textures for example. Set to
a number from 2 to 32, roughly corresponding to quality. Numbers
higher than 8 see minimizing gains.
- pp_celshade - set to 1 to enable cell shading (a more complex color
filter).
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