2006-11-25 11:49:17 -07:00
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<TITLE>Environment Variables</TITLE>
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<link rel="stylesheet" type="text/css" href="mesa.css"></head>
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<BODY>
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<H1>Environment Variables</H1>
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<p>
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2011-10-23 07:37:25 -06:00
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Normally, no environment variables need to be set. Most of the environment
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variables used by Mesa/Gallium are for debugging purposes, but they can
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sometimes be useful for debugging end-user issues.
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2006-11-25 11:49:17 -07:00
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</p>
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2011-10-23 07:37:25 -06:00
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<H2>LibGL environment variables</H2>
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<ul>
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<li>LIBGL_DEBUG - If defined debug information will be printed to stderr.
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If set to 'verbose' additional information will be printed.
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<li>LIBGL_DRIVERS_PATH - colon-separated list of paths to search for DRI drivers
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<li>LIBGL_ALWAYS_INDIRECT - forces an indirect rendering context/connection.
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<li>LIBGL_ALWAYS_SOFTWARE - if set, always use software rendering
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<li>LIBGL_NO_DRAWARRAYS - if set do not use DrawArrays GLX protocol (for debugging)
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</ul>
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<H2>Core Mesa environment variables</H2>
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2006-11-25 11:49:17 -07:00
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<ul>
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<li>MESA_NO_ASM - if set, disables all assembly language optimizations
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<li>MESA_NO_MMX - if set, disables Intel MMX optimizations
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<li>MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations
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<li>MESA_NO_SSE - if set, disables Intel SSE optimizations
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2011-10-23 07:37:25 -06:00
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<li>MESA_DEBUG - if set, error messages are printed to stderr. For example,
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if the application generates a GL_INVALID_ENUM error, a corresponding error
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message indicating where the error occured, and possibly why, will be
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printed to stderr.<br>
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If the value of MESA_DEBUG is 'FP' floating point arithmetic errors will
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generate exceptions.
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2006-11-25 11:49:17 -07:00
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<li>MESA_TEX_PROG - if set, implement conventional texture env modes with
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fragment programs (intended for developers only)
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<li>MESA_TNL_PROG - if set, implement conventional vertex transformation
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operations with vertex programs (intended for developers only).
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Setting this variable automatically sets the MESA_TEX_PROG variable as well.
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2010-05-22 14:05:42 -06:00
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<li>MESA_EXTENSION_OVERRIDE - can be used to enable/disable extensions.
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A value such as "GL_EXT_foo -GL_EXT_bar" will enable the GL_EXT_foo extension
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and disable the GL_EXT_bar extension.
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2012-08-17 07:57:59 -06:00
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<li>MESA_EXTENSION_MAX_YEAR - The GL_EXTENSIONS string returned by Mesa is sorted
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by extension year.
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If this variable is set to year X, only extensions defined on or before year
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X will be reported.
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This is to work-around a bug in some games where the extension string is
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copied into a fixed-size buffer without truncating.
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If the extension string is too long, the buffer overrun can cause the game
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to crash.
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This is a work-around for that.
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<li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a>
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2006-11-25 11:49:17 -07:00
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</ul>
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2011-10-23 07:37:25 -06:00
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<H2>Mesa Xlib driver environment variables</H2>
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2006-11-25 11:49:17 -07:00
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<p>
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The following are only applicable to the Mesa Xlib software driver.
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See the <A HREF="xlibdriver.html">Xlib software driver page</A> for details.
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2006-11-25 11:49:17 -07:00
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</p>
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<ul>
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<li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode
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<li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode
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<li>MESA_BACK_BUFFER - specifies how to implement the back color buffer,
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either "pixmap" or "ximage"
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<li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels
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<li>MESA_XSYNC - enable synchronous X behavior (for debugging only)
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<li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals
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<li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering,
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"window" to render into a window, or "disable" to disable the Glide driver.
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<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
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<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
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<li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.
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</ul>
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2011-10-23 07:37:25 -06:00
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<h2>i945/i965 driver environment variables (non-Gallium)</h2>
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2010-05-22 14:05:42 -06:00
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<ul>
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<li>INTEL_STRICT_CONFORMANCE - if set to 1, enable sw fallbacks to improve
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OpenGL conformance. If set to 2, always use software rendering.
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<li>INTEL_NO_BLIT - if set, disable hardware-accelerated glBitmap,
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glCopyPixels, glDrawPixels.
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</ul>
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2011-10-23 07:37:25 -06:00
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<h2>Radeon R300 driver environment variables (non-Gallium)</h2>
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2010-05-22 14:05:42 -06:00
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<ul>
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<li>R300_NO_TCL - if set, disable hardware-accelerated Transform/Clip/Lighting.
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</ul>
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2011-10-23 07:37:25 -06:00
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<h2>EGL environment variables</h2>
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2010-05-22 14:05:42 -06:00
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<p>
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Mesa EGL supports different sets of environment variables. See the
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<a href="egl.html">Mesa EGL</a> page for the details.
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</p>
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2011-10-23 07:37:25 -06:00
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<h2>Gallium environment variables</h2>
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<ul>
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<li>GALLIUM_PRINT_OPTIONS - if non-zero, print all the Gallium environment
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variables which are used, and their current values.
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<li>GALLIUM_NOSSE - if non-zero, do not use SSE runtime code generation for
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shader execution
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<li>GALLIUM_NOPPC - if non-zero, do not use PPC runtime code generation for
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shader execution
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<li>GALLIUM_DUMP_CPU - if non-zero, print information about the CPU on start-up
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<li>TGSI_PRINT_SANITY - if set, do extra sanity checking on TGSI shaders and
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print any errors to stderr.
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<LI>DRAW_FSE - ???
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<LI>DRAW_NO_FSE - ???
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<li>DRAW_USE_LLVM - if set to zero, the draw module will not use LLVM to execute
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shaders, vertex fetch, etc.
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</ul>
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<h3>Softpipe driver environment variables</h3>
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<ul>
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<li>SOFTPIPE_DUMP_FS - if set, the softpipe driver will print fragment shaders
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to stderr
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<li>SOFTPIPE_DUMP_GS - if set, the softpipe driver will print geometry shaders
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to stderr
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<li>SOFTPIPE_NO_RAST - if set, rasterization is no-op'd. For profiling purposes.
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</ul>
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<h3>LLVMpipe driver environment variables</h3>
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<ul>
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<li>LP_NO_RAST - if set LLVMpipe will no-op rasterization
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<li>LP_DEBUG - a comma-separated list of debug options is acceptec. See the
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source code for details.
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<li>LP_PERF - a comma-separated list of options to selectively no-op various
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parts of the driver. See the source code for details.
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<li>LP_NUM_THREADS - an integer indicating how many threads to use for rendering.
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Zero turns of threading completely. The default value is the number of CPU
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cores present.
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</ul>
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<p>
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Other Gallium drivers have their own environment variables. These may change
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frequently so the source code should be consulted for details.
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</p>
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<br>
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<br>
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2006-11-25 11:49:17 -07:00
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</BODY>
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</HTML>
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