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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Off-screen Rendering</title>
<link rel="stylesheet" type="text/css" href="mesa.css">
</head>
<body>
<div class="header">
The Mesa 3D Graphics Library
</div>
<iframe src="contents.html"></iframe>
<div class="content">
<h1>Off-screen Rendering</h1>
<p>
Mesa's off-screen interface is used for rendering into user-allocated memory
without any sort of window system or operating system dependencies.
That is, the GL_FRONT colorbuffer is actually a buffer in main memory,
rather than a window on your display.
</p>
<p>
The OSMesa API provides three basic functions for making off-screen
renderings: OSMesaCreateContext(), OSMesaMakeCurrent(), and
OSMesaDestroyContext(). See the Mesa/include/GL/osmesa.h header for
more information about the API functions.
</p>
<p>
The OSMesa interface may be used with any of three software renderers:
</p>
<ol>
<li>llvmpipe - this is the high-performance Gallium LLVM driver
<li>softpipe - this it the reference Gallium software driver
<li>swrast - this is the legacy Mesa software rasterizer
</ol>
<p>
There are several examples of OSMesa in the mesa/demos repository.
</p>
<h2>Building OSMesa</h2>
<p>
Configure and build Mesa with something like:
<pre>
meson builddir -Dosmesa=gallium -Dgallium-drivers=swrast -Ddri-drivers=[] -Dvulkan-drivers=[] -Dprefix=$PWD/builddir/install
ninja -C builddir install
</pre>
<p>
Make sure you have LLVM installed first if you want to use the llvmpipe driver.
</p>
<p>
When the build is complete you should find:
</p>
<pre>
$PWD/builddir/install/lib/libOSMesa.so (swrast-based OSMesa)
$PWD/builddir/install/lib/gallium/libOSMsea.so (gallium-based OSMesa)
</pre>
<p>
Set your LD_LIBRARY_PATH to point to $PWD/builddir/install to use the libraries
</p>
<p>
When you link your application, link with -lOSMesa
</p>
</div>
</body>
</html>
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