Path: blob/21.2-virgl/docs/application-issues.rst
4545 views
Application Issues ================== This page documents known issues with some OpenGL applications. Topogun ------- `Topogun <http://www.topogun.com/>`__ 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. Mesa 9.1.2 and later (will) support a DRI configuration option to work around this issue. Using the `driconf <https://dri.freedesktop.org/wiki/DriConf>`__ 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. Old OpenGL games ---------------- Some old OpenGL games (approx. ten years or older) may crash during start-up because of an extension string buffer-overflow problem. 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. 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. For example, if the game was released in 2001, do .. code-block:: console export MESA_EXTENSION_MAX_YEAR=2001 before running the game. Viewperf -------- See the :doc:`Viewperf issues <viewperf>` page for a detailed list of Viewperf issues.