| 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.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). |
