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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>Development Notes</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>Development Notes</h1>
<ul>
<li><a href="#extensions">Adding Extensions</a>
</ul>
<h2 id="extensions">Adding Extensions</h2>
<p>
To add a new GL extension to Mesa you have to do at least the following.
</p>
<ul>
<li>
If <code>glext.h</code> doesn't define the extension, edit
<code>include/GL/gl.h</code> and add code like this:
<pre>
#ifndef GL_EXT_the_extension_name
#define GL_EXT_the_extension_name 1
/* declare the new enum tokens */
/* prototype the new functions */
/* TYPEDEFS for the new functions */
#endif
</pre>
</li>
<li>
In the <code>src/mapi/glapi/gen/</code> directory, add the new extension
functions and enums to the <code>gl_API.xml</code> file.
Then, a bunch of source files must be regenerated by executing the
corresponding Python scripts.
</li>
<li>
Add a new entry to the <code>gl_extensions</code> struct in
<code>mtypes.h</code> if the extension requires driver capabilities not
already exposed by another extension.
</li>
<li>
Add a new entry to the <code>src/mesa/main/extensions_table.h</code> file.
</li>
<li>
From this point, the best way to proceed is to find another extension,
similar to the new one, that's already implemented in Mesa and use it
as an example.
</li>
<li>
If the new extension adds new GL state, the functions in
<code>get.c</code>, <code>enable.c</code> and <code>attrib.c</code>
will most likely require new code.
</li>
<li>
To determine if the new extension is active in the current context,
use the auto-generated <code>_mesa_has_##name_str()</code> function
defined in <code>src/mesa/main/extensions.h</code>.
</li>
<li>
The dispatch tests <code>check_table.cpp</code> and
<code>dispatch_sanity.cpp</code> should be updated with details about
the new extensions functions. These tests are run using
<code>meson test</code>.
</li>
</ul>
</div>
</body>
</html>
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