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48 lines
1.5 KiB
48 lines
1.5 KiB
Application Issues |
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================== |
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This page documents known issues with some OpenGL applications. |
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Topogun |
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------- |
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`Topogun <http://www.topogun.com/>`__ for Linux (version 2, at least) |
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creates a GLX visual without requesting a depth buffer. This causes bad |
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rendering if the OpenGL driver happens to choose a visual without a |
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depth buffer. |
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Mesa 9.1.2 and later (will) support a DRI configuration option to work |
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around this issue. Using the |
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`driconf <https://dri.freedesktop.org/wiki/DriConf>`__ tool, set the |
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"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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Old OpenGL games |
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---------------- |
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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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The problem is a modern OpenGL driver will return a very long string for |
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the ``glGetString(GL_EXTENSIONS)`` query and if the application naively |
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copies the string into a fixed-size buffer it can overflow the buffer |
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and crash the application. |
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The work-around is to set the ``MESA_EXTENSION_MAX_YEAR`` environment |
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variable to the approximate release year of the game. This will cause |
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the ``glGetString(GL_EXTENSIONS)`` query to only report extensions older |
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than the given year. |
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For example, if the game was released in 2001, do |
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.. code-block:: console |
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export MESA_EXTENSION_MAX_YEAR=2001 |
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before running the game. |
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Viewperf |
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-------- |
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See the :doc:`Viewperf issues <viewperf>` page for a detailed list of |
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Viewperf issues.
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