Gallium Post-processing=======================The Gallium drivers support user-defined image post-processing. At theend of drawing a frame a post-processing filter can be applied to therendered image. Example filters include morphological antialiasing andcell shading.The filters can be toggled per-app via driconf, or per-session via thecorresponding 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.iryokufx.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).