55 lines
1.4 KiB
HTML
55 lines
1.4 KiB
HTML
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<HTML>
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<TITLE>PBuffer Rendering</TITLE>
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<link rel="stylesheet" type="text/css" href="mesa.css"></head>
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<BODY>
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<H1>PBuffer Rendering</H1>
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<p>
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Basically, FBconfigs and PBuffers allow you to do off-screen rendering
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with OpenGL. The OSMesa interface does basically the same thing, but
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fbconfigs and pbuffers are supported by more vendors.
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PBuffer rendering may also be hardware accelerated.
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</p>
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<p>
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PBuffers are getting more use nowadays, though they've actually been
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around for a long time on IRIX systems and other workstations.
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</p>
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<p>
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The
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<a href="http://oss.sgi.com/projects/ogl-sample/registry/SGIX/fbconfig.txt"
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target="_parent">GL_SGIX_fbconfig</a>
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and
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<a href="http://oss.sgi.com/projects/ogl-sample/registry/SGIX/pbuffer.txt"
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target="_parent">
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GL_SGIX_pbuffer</a> extensions describe the functionality.
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More recently, these extensions have been promoted to ARB extensions (on
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Windows at least).
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</p>
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<p>
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The Mesa/progs/xdemos/ directory has some useful code for working
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with pbuffers:
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</p>
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<ul>
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<li><b>pbinfo.c</b> - like glxinfo, it prints a list of available
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fbconfigs and whether each supports pbuffers.
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<li><b>pbutil.c</b> - a few utility functions for dealing with
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fbconfigs and pbuffers.
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<li><b>pbdemo.c</b> - a demonstration of off-screen rendering with pbuffers.
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</ul>
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<p>
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Mesa 4.1 and later support GL_SGIX_fbconfig and GL_SGIX_pbuffer (software
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rendering only).
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</p>
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</BODY>
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</HTML>
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