2015-11-21 19:36:47 -07:00
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<!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>Application Issues</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>Application Issues</h1>
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<p>
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This page documents known issues with some OpenGL applications.
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</p>
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<h2>Topogun</h2>
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<p>
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<a href="http://www.topogun.com/">Topogun</a> for Linux (version 2, at least)
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creates a GLX visual without requesting a depth buffer.
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This causes bad rendering if the OpenGL driver happens to choose a visual
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without a depth buffer.
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</p>
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<p>
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Mesa 9.1.2 and later (will) support a DRI configuration option to work around
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this issue.
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2018-10-23 00:35:32 -06:00
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Using the <a href="https://dri.freedesktop.org/wiki/DriConf">driconf</a> tool,
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2015-11-21 19:36:47 -07:00
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set the "Create all visuals with a depth buffer" option before running Topogun.
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Then, all GLX visuals will be created with a depth buffer.
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</p>
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<h2>Old OpenGL games</h2>
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<p>
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Some old OpenGL games (approx. ten years or older) may crash during
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start-up because of an extension string buffer-overflow problem.
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</p>
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<p>
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The problem is a modern OpenGL driver will return a very long string
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for the glGetString(GL_EXTENSIONS) query and if the application
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naively copies the string into a fixed-size buffer it can overflow the
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buffer and crash the application.
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</p>
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<p>
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The work-around is to set the MESA_EXTENSION_MAX_YEAR environment variable
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to the approximate release year of the game.
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This will cause the glGetString(GL_EXTENSIONS) query to only report extensions
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older than the given year.
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</p>
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<p>
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For example, if the game was released in 2001, do
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<pre>
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export MESA_EXTENSION_MAX_YEAR=2001
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</pre>
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before running the game.
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</p>
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<h2>Viewperf</h2>
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<p>
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See the <a href="viewperf.html">Viewperf issues</a> page for a detailed list
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of Viewperf issues.
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</p>
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</div>
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</body>
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</html>
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