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| <TITLE>Environment Variables</TITLE> |
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| <H1>Environment Variables</H1> |
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| <p> |
| Normally, no environment variables need to be set. Most of the environment |
| variables used by Mesa/Gallium are for debugging purposes, but they can |
| sometimes be useful for debugging end-user issues. |
| </p> |
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| <H2>LibGL environment variables</H2> |
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| <ul> |
| <li>LIBGL_DEBUG - If defined debug information will be printed to stderr. |
| If set to 'verbose' additional information will be printed. |
| <li>LIBGL_DRIVERS_PATH - colon-separated list of paths to search for DRI drivers |
| <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) |
| </ul> |
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| <H2>Core Mesa environment variables</H2> |
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| <ul> |
| <li>MESA_NO_ASM - if set, disables all assembly language optimizations |
| <li>MESA_NO_MMX - if set, disables Intel MMX optimizations |
| <li>MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations |
| <li>MESA_NO_SSE - if set, disables Intel SSE optimizations |
| <li>MESA_DEBUG - if set, error messages are printed to stderr. For example, |
| if the application generates a GL_INVALID_ENUM error, a corresponding error |
| message indicating where the error occured, and possibly why, will be |
| printed to stderr.<br> |
| If the value of MESA_DEBUG is 'FP' floating point arithmetic errors will |
| generate exceptions. |
| <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 |
| operations with vertex programs (intended for developers only). |
| Setting this variable automatically sets the MESA_TEX_PROG variable as well. |
| <li>MESA_EXTENSION_OVERRIDE - can be used to enable/disable extensions. |
| A value such as "GL_EXT_foo -GL_EXT_bar" will enable the GL_EXT_foo extension |
| and disable the GL_EXT_bar extension. |
| <li>MESA_EXTENSION_MAX_YEAR - The GL_EXTENSIONS string returned by Mesa is sorted |
| by extension year. |
| If this variable is set to year X, only extensions defined on or before year |
| X will be reported. |
| This is to work-around a bug in some games where the extension string is |
| copied into a fixed-size buffer without truncating. |
| If the extension string is too long, the buffer overrun can cause the game |
| to crash. |
| This is a work-around for that. |
| <li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a> |
| </ul> |
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| <H2>Mesa Xlib driver environment variables</H2> |
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| <p> |
| The following are only applicable to the Mesa Xlib software driver. |
| See the <A HREF="xlibdriver.html">Xlib software driver page</A> for details. |
| </p> |
| <ul> |
| <li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode |
| <li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode |
| <li>MESA_BACK_BUFFER - specifies how to implement the back color buffer, |
| either "pixmap" or "ximage" |
| <li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels |
| <li>MESA_XSYNC - enable synchronous X behavior (for debugging only) |
| <li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals |
| <li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering, |
| "window" to render into a window, or "disable" to disable the Glide driver. |
| <li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel. |
| <li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer. |
| <li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel. |
| </ul> |
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| <h2>i945/i965 driver environment variables (non-Gallium)</h2> |
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| <ul> |
| <li>INTEL_STRICT_CONFORMANCE - if set to 1, enable sw fallbacks to improve |
| OpenGL conformance. If set to 2, always use software rendering. |
| <li>INTEL_NO_BLIT - if set, disable hardware-accelerated glBitmap, |
| glCopyPixels, glDrawPixels. |
| </ul> |
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| <h2>Radeon R300 driver environment variables (non-Gallium)</h2> |
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| <ul> |
| <li>R300_NO_TCL - if set, disable hardware-accelerated Transform/Clip/Lighting. |
| </ul> |
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| <h2>EGL environment variables</h2> |
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| <p> |
| Mesa EGL supports different sets of environment variables. See the |
| <a href="egl.html">Mesa EGL</a> page for the details. |
| </p> |
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| <h2>Gallium environment variables</h2> |
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| <ul> |
| <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_FSE - ??? |
| <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. |
| </ul> |
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| <h3>Softpipe driver environment variables</h3> |
| <ul> |
| <li>SOFTPIPE_DUMP_FS - if set, the softpipe driver will print fragment shaders |
| to stderr |
| <li>SOFTPIPE_DUMP_GS - if set, the softpipe driver will print geometry shaders |
| to stderr |
| <li>SOFTPIPE_NO_RAST - if set, rasterization is no-op'd. For profiling purposes. |
| </ul> |
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| <h3>LLVMpipe driver environment variables</h3> |
| <ul> |
| <li>LP_NO_RAST - if set LLVMpipe will no-op rasterization |
| <li>LP_DEBUG - a comma-separated list of debug options is acceptec. See the |
| source code for details. |
| <li>LP_PERF - a comma-separated list of options to selectively no-op various |
| parts of the driver. See the source code for details. |
| <li>LP_NUM_THREADS - an integer indicating how many threads to use for rendering. |
| Zero turns of threading completely. The default value is the number of CPU |
| cores present. |
| </ul> |
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| <p> |
| Other Gallium drivers have their own environment variables. These may change |
| frequently so the source code should be consulted for details. |
| </p> |
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