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">
|
||
|
|
<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">
|
||
|
|
<h1>The Mesa 3D Graphics Library</h1>
|
||
|
|
</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>
|
||
|
|
|
||
|
|
<h1>Building OSMesa</h1>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
Configure and build Mesa with something like:
|
||
|
|
|
||
|
|
<pre>
|
||
|
|
configure --enable-osmesa --disable-driglx-direct --disable-dri --with-gallium-drivers=swrast
|
||
|
|
make
|
||
|
|
</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>
|
||
|
|
lib/libOSMesa.so (swrast-based OSMesa)
|
||
|
|
lib/gallium/libOSMsea.so (gallium-based OSMesa)
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
Set your LD_LIBRARY_PATH to point to one directory or the other to select
|
||
|
|
the library you want to use.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
When you link your application, link with -lOSMesa
|
||
|
|
</p>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|