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82 lines
1.9 KiB
HTML
82 lines
1.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<title>Off-screen Rendering</title>
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<link rel="stylesheet" type="text/css" href="mesa.css">
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</head>
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<body>
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<div class="header">
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<h1>The Mesa 3D Graphics Library</h1>
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</div>
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<iframe src="contents.html"></iframe>
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<div class="content">
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<h1>Off-screen Rendering</h1>
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<p>
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Mesa's off-screen interface is used for rendering into user-allocated memory
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without any sort of window system or operating system dependencies.
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That is, the GL_FRONT colorbuffer is actually a buffer in main memory,
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rather than a window on your display.
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</p>
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<p>
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The OSMesa API provides three basic functions for making off-screen
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renderings: OSMesaCreateContext(), OSMesaMakeCurrent(), and
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OSMesaDestroyContext(). See the Mesa/include/GL/osmesa.h header for
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more information about the API functions.
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</p>
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<p>
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The OSMesa interface may be used with any of three software renderers:
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</p>
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<ol>
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<li>llvmpipe - this is the high-performance Gallium LLVM driver
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<li>softpipe - this it the reference Gallium software driver
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<li>swrast - this is the legacy Mesa software rasterizer
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</ol>
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<p>
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There are several examples of OSMesa in the mesa/demos repository.
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</p>
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<h1>Building OSMesa</h1>
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<p>
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Configure and build Mesa with something like:
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<pre>
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configure --enable-osmesa --disable-driglx-direct --disable-dri --with-gallium-drivers=swrast
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make
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</pre>
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<p>
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Make sure you have LLVM installed first if you want to use the llvmpipe driver.
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</p>
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<p>
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When the build is complete you should find:
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</p>
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<pre>
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lib/libOSMesa.so (swrast-based OSMesa)
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lib/gallium/libOSMsea.so (gallium-based OSMesa)
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</pre>
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<p>
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Set your LD_LIBRARY_PATH to point to one directory or the other to select
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the library you want to use.
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</p>
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<p>
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When you link your application, link with -lOSMesa
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</p>
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</div>
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</body>
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</html>
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