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  3. <head>
  4.   <meta http-equiv="content-type" content="text/html; charset=utf-8">
  5.   <title>Environment Variables</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>Environment Variables</h1>
  18.  
  19. <p>
  20. Normally, no environment variables need to be set.  Most of the environment
  21. variables used by Mesa/Gallium are for debugging purposes, but they can
  22. sometimes be useful for debugging end-user issues.
  23. </p>
  24.  
  25.  
  26. <h2>LibGL environment variables</h2>
  27.  
  28. <ul>
  29. <li>LIBGL_DEBUG - If defined debug information will be printed to stderr.
  30.    If set to 'verbose' additional information will be printed.
  31. <li>LIBGL_DRIVERS_PATH - colon-separated list of paths to search for DRI drivers
  32. <li>LIBGL_ALWAYS_INDIRECT - forces an indirect rendering context/connection.
  33. <li>LIBGL_ALWAYS_SOFTWARE - if set, always use software rendering
  34. <li>LIBGL_NO_DRAWARRAYS - if set do not use DrawArrays GLX protocol (for debugging)
  35. <li>LIBGL_SHOW_FPS - print framerate to stdout based on the number of glXSwapBuffers
  36.     calls per second.
  37. </ul>
  38.  
  39.  
  40.  
  41. <h2>Core Mesa environment variables</h2>
  42.  
  43. <ul>
  44. <li>MESA_NO_ASM - if set, disables all assembly language optimizations
  45. <li>MESA_NO_MMX - if set, disables Intel MMX optimizations
  46. <li>MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations
  47. <li>MESA_NO_SSE - if set, disables Intel SSE optimizations
  48. <li>MESA_DEBUG - if set, error messages are printed to stderr.  For example,
  49.    if the application generates a GL_INVALID_ENUM error, a corresponding error
  50.    message indicating where the error occured, and possibly why, will be
  51.    printed to stderr.<br>
  52.    If the value of MESA_DEBUG is 'FP' floating point arithmetic errors will
  53.    generate exceptions.
  54. <li>MESA_LOG_FILE - specifies a file name for logging all errors, warnings,
  55. etc., rather than stderr
  56. <li>MESA_TEX_PROG - if set, implement conventional texture env modes with
  57. fragment programs (intended for developers only)
  58. <li>MESA_TNL_PROG - if set, implement conventional vertex transformation
  59. operations with vertex programs (intended for developers only).
  60. Setting this variable automatically sets the MESA_TEX_PROG variable as well.
  61. <li>MESA_EXTENSION_OVERRIDE - can be used to enable/disable extensions.
  62. A value such as "GL_EXT_foo -GL_EXT_bar" will enable the GL_EXT_foo extension
  63. and disable the GL_EXT_bar extension.
  64. <li>MESA_EXTENSION_MAX_YEAR - The GL_EXTENSIONS string returned by Mesa is sorted
  65. by extension year.
  66. If this variable is set to year X, only extensions defined on or before year
  67. X will be reported.
  68. This is to work-around a bug in some games where the extension string is
  69. copied into a fixed-size buffer without truncating.
  70. If the extension string is too long, the buffer overrun can cause the game
  71. to crash.
  72. This is a work-around for that.
  73. <li>MESA_GL_VERSION_OVERRIDE - changes the value returned by
  74. glGetString(GL_VERSION) and possibly the GL API type.
  75. <ul>
  76. <li> The format should be MAJOR.MINOR[FC]
  77. <li> FC is an optional suffix that indicates a forward compatible context.
  78. This is only valid for versions &gt;= 3.0.
  79. <li> GL versions &lt; 3.0 are set to a compatibility (non-Core) profile
  80. <li> GL versions = 3.0, see below
  81. <li> GL versions &gt; 3.0 are set to a Core profile
  82. <li> Examples: 2.1, 3.0, 3.0FC, 3.1, 3.1FC
  83. <ul>
  84. <li> 2.1 - select a compatibility (non-Core) profile with GL version 2.1
  85. <li> 3.0 - select a compatibility (non-Core) profile with GL version 3.0
  86. <li> 3.0FC - select a Core+Forward Compatible profile with GL version 3.0
  87. <li> 3.1 - select a Core profile with GL version 3.1
  88. <li> 3.1FC - select a Core+Forward Compatible profile with GL version 3.1
  89. </ul>
  90. <li> Mesa may not really implement all the features of the given version.
  91. (for developers only)
  92. </ul>
  93. <li>MESA_GLSL_VERSION_OVERRIDE - changes the value returned by
  94. glGetString(GL_SHADING_LANGUAGE_VERSION). Valid values are integers, such as
  95. "130".  Mesa will not really implement all the features of the given language version
  96. if it's higher than what's normally reported. (for developers only)
  97. <li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a>
  98. </ul>
  99.  
  100.  
  101. <h2>Mesa Xlib driver environment variables</h2>
  102.  
  103. <p>
  104. The following are only applicable to the Mesa Xlib software driver.
  105. See the <a href="xlibdriver.html">Xlib software driver page</a> for details.
  106. </p>
  107. <ul>
  108. <li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode
  109. <li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode
  110. <li>MESA_BACK_BUFFER - specifies how to implement the back color buffer,
  111.     either "pixmap" or "ximage"
  112. <li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels
  113. <li>MESA_XSYNC - enable synchronous X behavior (for debugging only)
  114. <li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals
  115. <li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
  116. <li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
  117. <li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.
  118. </ul>
  119.  
  120.  
  121. <h2>i945/i965 driver environment variables (non-Gallium)</h2>
  122.  
  123. <ul>
  124. <li>INTEL_STRICT_CONFORMANCE - if set to 1, enable sw fallbacks to improve
  125.     OpenGL conformance.  If set to 2, always use software rendering.
  126. <li>INTEL_NO_BLIT - if set, disable hardware-accelerated glBitmap,
  127.     glCopyPixels, glDrawPixels.
  128. </ul>
  129.  
  130.  
  131. <h2>Radeon driver environment variables (radeon, r200, and r300g)</h2>
  132.  
  133. <ul>
  134. <li>RADEON_NO_TCL - if set, disable hardware-accelerated Transform/Clip/Lighting.
  135. </ul>
  136.  
  137.  
  138. <h2>EGL environment variables</h2>
  139.  
  140. <p>
  141. Mesa EGL supports different sets of environment variables.  See the
  142. <a href="egl.html">Mesa EGL</a> page for the details.
  143. </p>
  144.  
  145.  
  146. <h2>Gallium environment variables</h2>
  147.  
  148. <ul>
  149. <li>GALLIUM_HUD - draws various information on the screen, like framerate,
  150.     cpu load, driver statistics, performance counters, etc.
  151.     Set GALLIUM_HUD=help and run e.g. glxgears for more info.
  152. <li>GALLIUM_LOG_FILE - specifies a file for logging all errors, warnings, etc.
  153.     rather than stderr.
  154. <li>GALLIUM_PRINT_OPTIONS - if non-zero, print all the Gallium environment
  155.     variables which are used, and their current values.
  156. <li>GALLIUM_DUMP_CPU - if non-zero, print information about the CPU on start-up
  157. <li>TGSI_PRINT_SANITY - if set, do extra sanity checking on TGSI shaders and
  158.     print any errors to stderr.
  159. <LI>DRAW_FSE - ???
  160. <LI>DRAW_NO_FSE - ???
  161. <li>DRAW_USE_LLVM - if set to zero, the draw module will not use LLVM to execute
  162.     shaders, vertex fetch, etc.
  163. <li>ST_DEBUG - controls debug output from the Mesa/Gallium state tracker.
  164. Setting to "tgsi", for example, will print all the TGSI shaders.
  165. See src/mesa/state_tracker/st_debug.c for other options.
  166. </ul>
  167.  
  168. <h3>Softpipe driver environment variables</h3>
  169. <ul>
  170. <li>SOFTPIPE_DUMP_FS - if set, the softpipe driver will print fragment shaders
  171.     to stderr
  172. <li>SOFTPIPE_DUMP_GS - if set, the softpipe driver will print geometry shaders
  173.     to stderr
  174. <li>SOFTPIPE_NO_RAST - if set, rasterization is no-op'd.  For profiling purposes.
  175. <li>SOFTPIPE_USE_LLVM - if set, the softpipe driver will try to use LLVM JIT for
  176.    vertex shading procesing.
  177. </ul>
  178.  
  179.  
  180. <h3>LLVMpipe driver environment variables</h3>
  181. <ul>
  182. <li>LP_NO_RAST - if set LLVMpipe will no-op rasterization
  183. <li>LP_DEBUG - a comma-separated list of debug options is acceptec.  See the
  184.    source code for details.
  185. <li>LP_PERF - a comma-separated list of options to selectively no-op various
  186.    parts of the driver.  See the source code for details.
  187. <li>LP_NUM_THREADS - an integer indicating how many threads to use for rendering.
  188.    Zero turns of threading completely.  The default value is the number of CPU
  189.    cores present.
  190. </ul>
  191.  
  192. <h3>VMware SVGA driver environment variables</h3>
  193. <ul>
  194. <li>SVGA_FORCE_SWTNL - force use of software vertex transformation
  195. <li>SVGA_NO_SWTNL - don't allow software vertex transformation fallbacks
  196. (will often result in incorrect rendering).
  197. <li>SVGA_DEBUG - for dumping shaders, constant buffers, etc.  See the code
  198. for details.
  199. <li>See the driver code for other, lesser-used variables.
  200. </ul>
  201.  
  202.  
  203. <p>
  204. Other Gallium drivers have their own environment variables.  These may change
  205. frequently so the source code should be consulted for details.
  206. </p>
  207.  
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  211.