1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4 <meta http-equiv="content-type" content="text/html; charset=utf-8">
5 <title>Application Issues</title>
6 <link rel="stylesheet" type="text/css" href="mesa.css">
11 <h1>The Mesa 3D Graphics Library</h1>
14 <iframe src="contents.html"></iframe>
17 <h1>Application Issues</h1>
20 This page documents known issues with some OpenGL applications.
27 <a href="http://www.topogun.com/">Topogun</a> for Linux (version 2, at least)
28 creates a GLX visual without requesting a depth buffer.
29 This causes bad rendering if the OpenGL driver happens to choose a visual
30 without a depth buffer.
34 Mesa 9.1.2 and later (will) support a DRI configuration option to work around
36 Using the <a href="http://dri.freedesktop.org/wiki/DriConf">driconf</a> tool,
37 set the "Create all visuals with a depth buffer" option before running Topogun.
38 Then, all GLX visuals will be created with a depth buffer.
42 <h2>Old OpenGL games</h2>
45 Some old OpenGL games (approx. ten years or older) may crash during
46 start-up because of an extension string buffer-overflow problem.
50 The problem is a modern OpenGL driver will return a very long string
51 for the glGetString(GL_EXTENSIONS) query and if the application
52 naively copies the string into a fixed-size buffer it can overflow the
53 buffer and crash the application.
57 The work-around is to set the MESA_EXTENSION_MAX_YEAR environment variable
58 to the approximate release year of the game.
59 This will cause the glGetString(GL_EXTENSIONS) query to only report extensions
60 older than the given year.
64 For example, if the game was released in 2001, do
66 export MESA_EXTENSION_MAX_YEAR=2001
68 before running the game.
76 See the <a href="viewperf.html">Viewperf issues</a> page for a detailed list