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| <title>Application Issues</title> |
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| |
| <div class="header"> |
| <h1>The Mesa 3D Graphics Library</h1> |
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| <h1>Application Issues</h1> |
| |
| <p> |
| This page documents known issues with some OpenGL applications. |
| </p> |
| |
| |
| <h2>Topogun</h2> |
| |
| <p> |
| <a href="http://www.topogun.com/">Topogun</a> for Linux (version 2, at least) |
| creates a GLX visual without requesting a depth buffer. |
| This causes bad rendering if the OpenGL driver happens to choose a visual |
| without a depth buffer. |
| </p> |
| |
| <p> |
| Mesa 9.1.2 and later (will) support a DRI configuration option to work around |
| this issue. |
| Using the <a href="https://dri.freedesktop.org/wiki/DriConf">driconf</a> tool, |
| set the "Create all visuals with a depth buffer" option before running Topogun. |
| Then, all GLX visuals will be created with a depth buffer. |
| </p> |
| |
| |
| <h2>Old OpenGL games</h2> |
| |
| <p> |
| Some old OpenGL games (approx. ten years or older) may crash during |
| start-up because of an extension string buffer-overflow problem. |
| </p> |
| |
| <p> |
| The problem is a modern OpenGL driver will return a very long string |
| for the glGetString(GL_EXTENSIONS) query and if the application |
| naively copies the string into a fixed-size buffer it can overflow the |
| buffer and crash the application. |
| </p> |
| |
| <p> |
| The work-around is to set the MESA_EXTENSION_MAX_YEAR environment variable |
| to the approximate release year of the game. |
| This will cause the glGetString(GL_EXTENSIONS) query to only report extensions |
| older than the given year. |
| </p> |
| |
| <p> |
| For example, if the game was released in 2001, do |
| <pre> |
| export MESA_EXTENSION_MAX_YEAR=2001 |
| </pre> |
| before running the game. |
| </p> |
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| <h2>Viewperf</h2> |
| |
| <p> |
| See the <a href="viewperf.html">Viewperf issues</a> page for a detailed list |
| of Viewperf issues. |
| </p> |
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