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docs: Add a page on post-processing 

With edits by Brian.

Signed-off-by: Lauri Kasanen <cand@gmx.com>
Signed-off-by: Brian Paul <brianp@vmware.com>
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Lauri Kasanen 2011-08-25 23:26:17 +03:00 committed by Brian Paul
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commit 50da22ceb1
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docs/contents.html
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@ -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>
</ul>
<b>Developer Topics</b>

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<HTML>
<TITLE>Gallium Post-processing</TITLE>
<link rel="stylesheet" type="text/css" href="mesa.css"></head>
<BODY>
<H1>Gallium Post-processing</H1>
<p>
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.
</p>
<p>
The filters can be toggled per-app via driconf, or per-session via the
corresponding environment variables.
</p>
<p>
Multiple filters can be used together.
</p>
<H2>PP environment variables</H2>
<ul>
<li>PP_DEBUG - If defined debug information will be printed to stderr.
</ul>
<h2>Current filters</h2>
<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).
</ul>
<br>
<br>
</BODY>
</HTML>