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49 lines
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49 lines
1.5 KiB
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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 <https://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:: sh
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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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