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| <h1>The Mesa 3D Graphics Library</h1> |
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| <h1>Gallium Post-processing</h1> |
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| 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. |
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| The filters can be toggled per-app via driconf, or per-session via the |
| corresponding environment variables. |
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| Multiple filters can be used together. |
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| <h2>PP environment variables</h2> |
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| <ul> |
| <li>PP_DEBUG - If defined debug information will be printed to stderr. |
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| <h2>Current filters</h2> |
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| <ul> |
| <li>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. |
| <li>pp_jimenezmlaa, pp_jimenezmlaa_color - |
| <a href="http://www.iryokufx.com/mlaa/" target=_blank>Jimenez's MLAA</a> |
| 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. |
| <li>pp_celshade - set to 1 to enable cell shading (a more complex color filter). |
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