</head>
<body>
+<div class="header">
+ <h1>The Mesa 3D Graphics Library</h1>
+</div>
+
+<iframe src="contents.html"></iframe>
+<div class="content">
+
<h1>Environment Variables</h1>
<p>
<li>LIBGL_ALWAYS_INDIRECT - forces an indirect rendering context/connection.
<li>LIBGL_ALWAYS_SOFTWARE - if set, always use software rendering
<li>LIBGL_NO_DRAWARRAYS - if set do not use DrawArrays GLX protocol (for debugging)
+<li>LIBGL_SHOW_FPS - print framerate to stdout based on the number of glXSwapBuffers
+ calls per second.
</ul>
printed to stderr.<br>
If the value of MESA_DEBUG is 'FP' floating point arithmetic errors will
generate exceptions.
+<li>MESA_LOG_FILE - specifies a file name for logging all errors, warnings,
+etc., rather than stderr
<li>MESA_TEX_PROG - if set, implement conventional texture env modes with
fragment programs (intended for developers only)
<li>MESA_TNL_PROG - if set, implement conventional vertex transformation
to crash.
This is a work-around for that.
<li>MESA_GL_VERSION_OVERRIDE - changes the value returned by
-glGetString(GL_VERSION). Valid values are point-separated version numbers,
-such as "3.0". Mesa will not really implement all the features of the given
-version if it's higher than what's normally reported.
+glGetString(GL_VERSION) and possibly the GL API type.
+<ul>
+<li> The format should be MAJOR.MINOR[FC]
+<li> FC is an optional suffix that indicates a forward compatible context.
+This is only valid for versions >= 3.0.
+<li> GL versions < 3.0 are set to a compatibility (non-Core) profile
+<li> GL versions = 3.0, see below
+<li> GL versions > 3.0 are set to a Core profile
+<li> Examples: 2.1, 3.0, 3.0FC, 3.1, 3.1FC
+<ul>
+<li> 2.1 - select a compatibility (non-Core) profile with GL version 2.1
+<li> 3.0 - select a compatibility (non-Core) profile with GL version 3.0
+<li> 3.0FC - select a Core+Forward Compatible profile with GL version 3.0
+<li> 3.1 - select a Core profile with GL version 3.1
+<li> 3.1FC - select a Core+Forward Compatible profile with GL version 3.1
+</ul>
+<li> Mesa may not really implement all the features of the given version.
+(for developers only)
+</ul>
<li>MESA_GLSL_VERSION_OVERRIDE - changes the value returned by
glGetString(GL_SHADING_LANGUAGE_VERSION). Valid values are integers, such as
"130". Mesa will not really implement all the features of the given language version
<h2>Gallium environment variables</h2>
<ul>
+<li>GALLIUM_HUD - draws various information on the screen, like framerate,
+ cpu load, driver statistics, performance counters, etc.
+ Set GALLIUM_HUD=help and run e.g. glxgears for more info.
+<li>GALLIUM_LOG_FILE - specifies a file for logging all errors, warnings, etc.
+ rather than stderr.
<li>GALLIUM_PRINT_OPTIONS - if non-zero, print all the Gallium environment
variables which are used, and their current values.
-<li>GALLIUM_NOSSE - if non-zero, do not use SSE runtime code generation for
- shader execution
-<li>GALLIUM_NOPPC - if non-zero, do not use PPC runtime code generation for
- shader execution
<li>GALLIUM_DUMP_CPU - if non-zero, print information about the CPU on start-up
<li>TGSI_PRINT_SANITY - if set, do extra sanity checking on TGSI shaders and
print any errors to stderr.
<LI>DRAW_NO_FSE - ???
<li>DRAW_USE_LLVM - if set to zero, the draw module will not use LLVM to execute
shaders, vertex fetch, etc.
+<li>ST_DEBUG - controls debug output from the Mesa/Gallium state tracker.
+Setting to "tgsi", for example, will print all the TGSI shaders.
+See src/mesa/state_tracker/st_debug.c for other options.
</ul>
<h3>Softpipe driver environment variables</h3>
cores present.
</ul>
+<h3>VMware SVGA driver environment variables</h3>
+<ul>
+<li>SVGA_FORCE_SWTNL - force use of software vertex transformation
+<li>SVGA_NO_SWTNL - don't allow software vertex transformation fallbacks
+(will often result in incorrect rendering).
+<li>SVGA_DEBUG - for dumping shaders, constant buffers, etc. See the code
+for details.
+<li>See the driver code for other, lesser-used variables.
+</ul>
+
<p>
Other Gallium drivers have their own environment variables. These may change
frequently so the source code should be consulted for details.
</p>
+</div>
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</html>
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