1Gallium Post-processing 2======================= 3 4The Gallium drivers support user-defined image post-processing. At the 5end of drawing a frame a post-processing filter can be applied to the 6rendered image. Example filters include morphological antialiasing and 7cell shading. 8 9The filters can be toggled per-app via driconf, or per-session via the 10corresponding environment variables. 11 12Multiple filters can be used together. 13 14PP environment variables 15------------------------ 16 17- PP_DEBUG - If defined debug information will be printed to stderr. 18 19Current filters 20--------------- 21 22- pp_nored, pp_nogreen, pp_noblue - set to 1 to remove the 23 corresponding color channel. These are basic filters for easy testing 24 of the PP queue. 25- pp_jimenezmlaa, pp_jimenezmlaa_color - `Jimenez's 26 MLAA <https://www.iryokufx.com/mlaa/>`__ is a morphological 27 antialiasing filter. The two versions use depth and color data, 28 respectively. Which works better depends on the app - depth will not 29 blur text, but it will miss transparent textures for example. Set to 30 a number from 2 to 32, roughly corresponding to quality. Numbers 31 higher than 8 see minimizing gains. 32- pp_celshade - set to 1 to enable cell shading (a more complex color 33 filter). 34