Commit 50da22ce authored by Lauri Kasanen's avatar Lauri Kasanen Committed by Brian Paul

docs: Add a page on post-processing

With edits by Brian.
Signed-off-by: Lauri Kasanen's avatarLauri Kasanen <>
Signed-off-by: Brian Paul's avatarBrian Paul <>
parent 0295ac9c
......@@ -63,6 +63,7 @@ a:visited {
<LI><A HREF="extensions.html" target="MainFrame">Mesa Extensions</A>
<LI><A HREF="mangling.html" target="MainFrame">Function Name Mangling</A>
<LI><A href="llvmpipe.html" target="MainFrame">Gallium llvmpipe driver</A>
<LI><A href="postprocess.html" target="MainFrame">Gallium post-processing</A>
<b>Developer Topics</b>
<TITLE>Gallium Post-processing</TITLE>
<link rel="stylesheet" type="text/css" href="mesa.css"></head>
<H1>Gallium Post-processing</H1>
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.
<H2>PP environment variables</H2>
<li>PP_DEBUG - If defined debug information will be printed to stderr.
<h2>Current filters</h2>
<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="" 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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