211 lines
8.3 KiB
HTML
211 lines
8.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<title>Environment Variables</title>
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<link rel="stylesheet" type="text/css" href="mesa.css">
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</head>
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<body>
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<div class="header">
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<h1>The Mesa 3D Graphics Library</h1>
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</div>
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<iframe src="contents.html"></iframe>
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<div class="content">
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<h1>Environment Variables</h1>
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<p>
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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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</p>
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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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<li>LIBGL_SHOW_FPS - print framerate to stdout based on the number of glXSwapBuffers
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calls per second.
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</ul>
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<h2>Core Mesa environment variables</h2>
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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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<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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<li>MESA_LOG_FILE - specifies a file name for logging all errors, warnings,
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etc., rather than stderr
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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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<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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<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_GL_VERSION_OVERRIDE - changes the value returned by
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glGetString(GL_VERSION) and possibly the GL API type.
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<ul>
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<li> The format should be MAJOR.MINOR[FC]
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<li> FC is an optional suffix that indicates a forward compatible context.
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This is only valid for versions >= 3.0.
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<li> GL versions < 3.0 are set to a compatibility (non-Core) profile
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<li> GL versions = 3.0, see below
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<li> GL versions > 3.0 are set to a Core profile
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<li> Examples: 2.1, 3.0, 3.0FC, 3.1, 3.1FC
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<ul>
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<li> 2.1 - select a compatibility (non-Core) profile with GL version 2.1
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<li> 3.0 - select a compatibility (non-Core) profile with GL version 3.0
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<li> 3.0FC - select a Core+Forward Compatible profile with GL version 3.0
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<li> 3.1 - select a Core profile with GL version 3.1
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<li> 3.1FC - select a Core+Forward Compatible profile with GL version 3.1
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</ul>
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<li> Mesa may not really implement all the features of the given version.
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(for developers only)
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</ul>
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<li>MESA_GLSL_VERSION_OVERRIDE - changes the value returned by
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glGetString(GL_SHADING_LANGUAGE_VERSION). Valid values are integers, such as
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"130". Mesa will not really implement all the features of the given language version
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if it's higher than what's normally reported. (for developers only)
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<li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a>
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</ul>
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<h2>Mesa Xlib driver environment variables</h2>
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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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</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_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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<h2>i945/i965 driver environment variables (non-Gallium)</h2>
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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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<h2>Radeon driver environment variables (radeon, r200, and r300g)</h2>
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<ul>
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<li>RADEON_NO_TCL - if set, disable hardware-accelerated Transform/Clip/Lighting.
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</ul>
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<h2>EGL environment variables</h2>
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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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<h2>Gallium environment variables</h2>
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<ul>
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<li>GALLIUM_HUD - draws various information on the screen, like framerate,
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cpu load, driver statistics, performance counters, etc.
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Set GALLIUM_HUD=help and run e.g. glxgears for more info.
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<li>GALLIUM_LOG_FILE - specifies a file for logging all errors, warnings, etc.
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rather than stderr.
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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_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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<li>ST_DEBUG - controls debug output from the Mesa/Gallium state tracker.
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Setting to "tgsi", for example, will print all the TGSI shaders.
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See src/mesa/state_tracker/st_debug.c for other options.
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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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<li>SOFTPIPE_USE_LLVM - if set, the softpipe driver will try to use LLVM JIT for
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vertex shading procesing.
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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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<h3>VMware SVGA driver environment variables</h3>
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<ul>
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<li>SVGA_FORCE_SWTNL - force use of software vertex transformation
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<li>SVGA_NO_SWTNL - don't allow software vertex transformation fallbacks
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(will often result in incorrect rendering).
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<li>SVGA_DEBUG - for dumping shaders, constant buffers, etc. See the code
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for details.
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<li>See the driver code for other, lesser-used variables.
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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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</div>
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</body>
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</html>
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