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  1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  2. <html lang="en">
  3. <head>
  4.   <meta http-equiv="content-type" content="text/html; charset=utf-8">
  5.   <title>Application Issues</title>
  6.   <link rel="stylesheet" type="text/css" href="mesa.css">
  7. </head>
  8. <body>
  9.  
  10. <div class="header">
  11.   <h1>The Mesa 3D Graphics Library</h1>
  12. </div>
  13.  
  14. <iframe src="contents.html"></iframe>
  15. <div class="content">
  16.  
  17. <h1>Application Issues</h1>
  18.  
  19. <p>
  20. This page documents known issues with some OpenGL applications.
  21. </p>
  22.  
  23.  
  24. <h2>Topogun</h2>
  25.  
  26. <p>
  27. <a href="http://www.topogun.com/">Topogun</a> for Linux (version 2, at least)
  28. creates a GLX visual without requesting a depth buffer.
  29. This causes bad rendering if the OpenGL driver happens to choose a visual
  30. without a depth buffer.
  31. </p>
  32.  
  33. <p>
  34. Mesa 9.1.2 and later (will) support a DRI configuration option to work around
  35. this issue.
  36. Using the <a href="http://dri.freedesktop.org/wiki/DriConf">driconf</a> tool,
  37. set the "Create all visuals with a depth buffer" option before running Topogun.
  38. Then, all GLX visuals will be created with a depth buffer.
  39. </p>
  40.  
  41.  
  42. <h2>Old OpenGL games</h2>
  43.  
  44. <p>
  45. Some old OpenGL games (approx. ten years or older) may crash during
  46. start-up because of an extension string buffer-overflow problem.
  47. </p>
  48.  
  49. <p>
  50. The problem is a modern OpenGL driver will return a very long string
  51. for the glGetString(GL_EXTENSIONS) query and if the application
  52. naively copies the string into a fixed-size buffer it can overflow the
  53. buffer and crash the application.
  54. </p>
  55.  
  56. <p>
  57. The work-around is to set the MESA_EXTENSION_MAX_YEAR environment variable
  58. to the approximate release year of the game.
  59. This will cause the glGetString(GL_EXTENSIONS) query to only report extensions
  60. older than the given year.
  61. </p>
  62.  
  63. <p>
  64. For example, if the game was released in 2001, do
  65. <pre>
  66. export MESA_EXTENSION_MAX_YEAR=2001
  67. </pre>
  68. before running the game.
  69. </p>
  70.  
  71.  
  72.  
  73. <h2>Viewperf</h2>
  74.  
  75. <p>
  76. See the <a href="viewperf.html">Viewperf issues</a> page for a detailed list
  77. of Viewperf issues.
  78. </p>
  79.  
  80.  
  81. </div>
  82. </body>
  83. </html>
  84.