1848b8605Smrg<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2848b8605Smrg<html lang="en"> 3848b8605Smrg<head> 4848b8605Smrg <meta http-equiv="content-type" content="text/html; charset=utf-8"> 5848b8605Smrg <title>Environment Variables</title> 6848b8605Smrg <link rel="stylesheet" type="text/css" href="mesa.css"> 7848b8605Smrg</head> 8848b8605Smrg<body> 9848b8605Smrg 10848b8605Smrg<div class="header"> 11848b8605Smrg <h1>The Mesa 3D Graphics Library</h1> 12848b8605Smrg</div> 13848b8605Smrg 14848b8605Smrg<iframe src="contents.html"></iframe> 15848b8605Smrg<div class="content"> 16848b8605Smrg 17848b8605Smrg<h1>Environment Variables</h1> 18848b8605Smrg 19848b8605Smrg<p> 20848b8605SmrgNormally, no environment variables need to be set. Most of the environment 21848b8605Smrgvariables used by Mesa/Gallium are for debugging purposes, but they can 22848b8605Smrgsometimes be useful for debugging end-user issues. 23848b8605Smrg</p> 24848b8605Smrg 25848b8605Smrg 26848b8605Smrg<h2>LibGL environment variables</h2> 27848b8605Smrg 28848b8605Smrg<ul> 29848b8605Smrg<li>LIBGL_DEBUG - If defined debug information will be printed to stderr. 30848b8605Smrg If set to 'verbose' additional information will be printed. 31848b8605Smrg<li>LIBGL_DRIVERS_PATH - colon-separated list of paths to search for DRI drivers 32b8e80941Smrg<li>LIBGL_ALWAYS_INDIRECT - if set to `true`, forces an indirect rendering context/connection. 33b8e80941Smrg<li>LIBGL_ALWAYS_SOFTWARE - if set to `true`, always use software rendering 34b8e80941Smrg<li>LIBGL_NO_DRAWARRAYS - if set to `true`, do not use DrawArrays GLX protocol (for debugging) 35848b8605Smrg<li>LIBGL_SHOW_FPS - print framerate to stdout based on the number of glXSwapBuffers 36848b8605Smrg calls per second. 37b8e80941Smrg<li>LIBGL_DRI3_DISABLE - disable DRI3 if set to `true`. 38848b8605Smrg</ul> 39848b8605Smrg 40848b8605Smrg 41848b8605Smrg 42848b8605Smrg<h2>Core Mesa environment variables</h2> 43848b8605Smrg 44848b8605Smrg<ul> 45848b8605Smrg<li>MESA_NO_ASM - if set, disables all assembly language optimizations 46848b8605Smrg<li>MESA_NO_MMX - if set, disables Intel MMX optimizations 47848b8605Smrg<li>MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations 48848b8605Smrg<li>MESA_NO_SSE - if set, disables Intel SSE optimizations 49b8e80941Smrg<li>MESA_NO_ERROR - if set to 1, error checking is disabled as per KHR_no_error. 50b8e80941Smrg This will result in undefined behaviour for invalid use of the api, but 51b8e80941Smrg can reduce CPU use for apps that are known to be error free.</li> 52848b8605Smrg<li>MESA_DEBUG - if set, error messages are printed to stderr. For example, 53848b8605Smrg if the application generates a GL_INVALID_ENUM error, a corresponding error 54848b8605Smrg message indicating where the error occurred, and possibly why, will be 55848b8605Smrg printed to stderr.<br> 56b8e80941Smrg 57b8e80941Smrg For release builds, MESA_DEBUG defaults to off (no debug output). 58b8e80941Smrg 59b8e80941Smrg MESA_DEBUG accepts the following comma-separated list of named 60b8e80941Smrg flags, which adds extra behaviour to just set MESA_DEBUG=1: 61b8e80941Smrg <ul> 62b8e80941Smrg <li>silent - turn off debug messages. Only useful for debug builds.</li> 63b8e80941Smrg <li>flush - flush after each drawing command</li> 64b8e80941Smrg <li>incomplete_tex - extra debug messages when a texture is incomplete</li> 65b8e80941Smrg <li>incomplete_fbo - extra debug messages when a fbo is incomplete</li> 66b8e80941Smrg <li>context - create a debug context (see GLX_CONTEXT_DEBUG_BIT_ARB) and 67b8e80941Smrg print error and performance messages to stderr (or MESA_LOG_FILE).</li> 68b8e80941Smrg </ul> 69848b8605Smrg<li>MESA_LOG_FILE - specifies a file name for logging all errors, warnings, 70848b8605Smrgetc., rather than stderr 71848b8605Smrg<li>MESA_TEX_PROG - if set, implement conventional texture env modes with 72848b8605Smrgfragment programs (intended for developers only) 73848b8605Smrg<li>MESA_TNL_PROG - if set, implement conventional vertex transformation 74848b8605Smrgoperations with vertex programs (intended for developers only). 75848b8605SmrgSetting this variable automatically sets the MESA_TEX_PROG variable as well. 76848b8605Smrg<li>MESA_EXTENSION_OVERRIDE - can be used to enable/disable extensions. 77848b8605SmrgA value such as "GL_EXT_foo -GL_EXT_bar" will enable the GL_EXT_foo extension 78848b8605Smrgand disable the GL_EXT_bar extension. 79848b8605Smrg<li>MESA_EXTENSION_MAX_YEAR - The GL_EXTENSIONS string returned by Mesa is sorted 80848b8605Smrgby extension year. 81848b8605SmrgIf this variable is set to year X, only extensions defined on or before year 82848b8605SmrgX will be reported. 83848b8605SmrgThis is to work-around a bug in some games where the extension string is 84848b8605Smrgcopied into a fixed-size buffer without truncating. 85848b8605SmrgIf the extension string is too long, the buffer overrun can cause the game 86848b8605Smrgto crash. 87848b8605SmrgThis is a work-around for that. 88848b8605Smrg<li>MESA_GL_VERSION_OVERRIDE - changes the value returned by 89848b8605SmrgglGetString(GL_VERSION) and possibly the GL API type. 90848b8605Smrg<ul> 91b8e80941Smrg <li>The format should be MAJOR.MINOR[FC|COMPAT] 92b8e80941Smrg <li>FC is an optional suffix that indicates a forward compatible 93b8e80941Smrg context. This is only valid for versions >= 3.0. 94b8e80941Smrg <li>COMPAT is an optional suffix that indicates a compatibility 95b8e80941Smrg context or GL_ARB_compatibility support. This is only valid for 96b8e80941Smrg versions >= 3.1. 97b8e80941Smrg <li>GL versions <= 3.0 are set to a compatibility (non-Core) 98b8e80941Smrg profile 99b8e80941Smrg <li>GL versions = 3.1, depending on the driver, it may or may not 100b8e80941Smrg have the ARB_compatibility extension enabled. 101b8e80941Smrg <li>GL versions >= 3.2 are set to a Core profile 102b8e80941Smrg <li>Examples: 2.1, 3.0, 3.0FC, 3.1, 3.1FC, 3.1COMPAT, X.Y, X.YFC, 103b8e80941Smrg X.YCOMPAT. 104b8e80941Smrg <ul> 105b8e80941Smrg <li>2.1 - select a compatibility (non-Core) profile with GL 106b8e80941Smrg version 2.1. 107b8e80941Smrg <li>3.0 - select a compatibility (non-Core) profile with GL 108b8e80941Smrg version 3.0. 109b8e80941Smrg <li>3.0FC - select a Core+Forward Compatible profile with GL 110b8e80941Smrg version 3.0. 111b8e80941Smrg <li>3.1 - select GL version 3.1 with GL_ARB_compatibility enabled 112b8e80941Smrg per the driver default. 113b8e80941Smrg <li>3.1FC - select GL version 3.1 with forward compatibility and 114b8e80941Smrg GL_ARB_compatibility disabled. 115b8e80941Smrg <li>3.1COMPAT - select GL version 3.1 with GL_ARB_compatibility 116b8e80941Smrg enabled. 117b8e80941Smrg <li>X.Y - override GL version to X.Y without changing the profile. 118b8e80941Smrg <li>X.YFC - select a Core+Forward Compatible profile with GL 119b8e80941Smrg version X.Y. 120b8e80941Smrg <li>X.YCOMPAT - select a Compatibility profile with GL version 121b8e80941Smrg X.Y. 122b8e80941Smrg </ul> 123b8e80941Smrg <li>Mesa may not really implement all the features of the given 124b8e80941Smrg version. (for developers only) 125848b8605Smrg</ul> 126b8e80941Smrg<li>MESA_GLES_VERSION_OVERRIDE - changes the value returned by 127b8e80941SmrgglGetString(GL_VERSION) for OpenGL ES. 128b8e80941Smrg<ul> 129b8e80941Smrg<li> The format should be MAJOR.MINOR 130b8e80941Smrg<li> Examples: 2.0, 3.0, 3.1 131848b8605Smrg<li> Mesa may not really implement all the features of the given version. 132848b8605Smrg(for developers only) 133848b8605Smrg</ul> 134848b8605Smrg<li>MESA_GLSL_VERSION_OVERRIDE - changes the value returned by 135848b8605SmrgglGetString(GL_SHADING_LANGUAGE_VERSION). Valid values are integers, such as 136848b8605Smrg"130". Mesa will not really implement all the features of the given language version 137848b8605Smrgif it's higher than what's normally reported. (for developers only) 138b8e80941Smrg<li>MESA_GLSL_CACHE_DISABLE - if set to `true`, disables the GLSL shader cache 139b8e80941Smrg<li>MESA_GLSL_CACHE_MAX_SIZE - if set, determines the maximum size of 140b8e80941Smrgthe on-disk cache of compiled GLSL programs. Should be set to a number 141b8e80941Smrgoptionally followed by 'K', 'M', or 'G' to specify a size in 142b8e80941Smrgkilobytes, megabytes, or gigabytes. By default, gigabytes will be 143b8e80941Smrgassumed. And if unset, a maximum size of 1GB will be used. Note: A separate 144b8e80941Smrgcache might be created for each architecture that Mesa is installed for on 145b8e80941Smrgyour system. For example under the default settings you may end up with a 1GB 146b8e80941Smrgcache for x86_64 and another 1GB cache for i386. 147b8e80941Smrg<li>MESA_GLSL_CACHE_DIR - if set, determines the directory to be used 148b8e80941Smrgfor the on-disk cache of compiled GLSL programs. If this variable is 149b8e80941Smrgnot set, then the cache will be stored in $XDG_CACHE_HOME/mesa_shader_cache (if 150b8e80941Smrgthat variable is set), or else within .cache/mesa_shader_cache within the user's 151b8e80941Smrghome directory. 152848b8605Smrg<li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a> 153b8e80941Smrg<li>MESA_NO_MINMAX_CACHE - when set, the minmax index cache is globally disabled. 154b8e80941Smrg<li>MESA_SHADER_CAPTURE_PATH - see <a href="shading.html#capture">Capturing Shaders</a></li> 155b8e80941Smrg<li>MESA_SHADER_DUMP_PATH and MESA_SHADER_READ_PATH - see <a href="shading.html#replacement">Experimenting with Shader Replacements</a></li> 156b8e80941Smrg<li>MESA_VK_VERSION_OVERRIDE - changes the Vulkan physical device version 157b8e80941Smrg as returned in VkPhysicalDeviceProperties::apiVersion. 158b8e80941Smrg <ul> 159b8e80941Smrg <li>The format should be MAJOR.MINOR[.PATCH]</li> 160b8e80941Smrg <li>This will not let you force a version higher than the driver's 161b8e80941Smrg instance versionas advertised by vkEnumerateInstanceVersion</li> 162b8e80941Smrg <li>This can be very useful for debugging but some features may not be 163b8e80941Smrg implemented correctly. (For developers only)</li> 164b8e80941Smrg </ul> 165b8e80941Smrg</li> 166848b8605Smrg</ul> 167848b8605Smrg 168848b8605Smrg 169848b8605Smrg<h2>Mesa Xlib driver environment variables</h2> 170848b8605Smrg 171848b8605Smrg<p> 172848b8605SmrgThe following are only applicable to the Mesa Xlib software driver. 173848b8605SmrgSee the <a href="xlibdriver.html">Xlib software driver page</a> for details. 174848b8605Smrg</p> 175848b8605Smrg<ul> 176848b8605Smrg<li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode 177848b8605Smrg<li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode 178848b8605Smrg<li>MESA_BACK_BUFFER - specifies how to implement the back color buffer, 179848b8605Smrg either "pixmap" or "ximage" 180848b8605Smrg<li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels 181848b8605Smrg<li>MESA_XSYNC - enable synchronous X behavior (for debugging only) 182848b8605Smrg<li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals 183848b8605Smrg<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel. 184848b8605Smrg<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer. 185848b8605Smrg<li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel. 186848b8605Smrg</ul> 187848b8605Smrg 188848b8605Smrg 189848b8605Smrg<h2>i945/i965 driver environment variables (non-Gallium)</h2> 190848b8605Smrg 191848b8605Smrg<ul> 192848b8605Smrg<li>INTEL_NO_HW - if set to 1, prevents batches from being submitted to the hardware. 193848b8605Smrg This is useful for debugging hangs, etc.</li> 194848b8605Smrg<li>INTEL_DEBUG - a comma-separated list of named flags, which do various things: 195848b8605Smrg<ul> 196b8e80941Smrg <li>ann - annotate IR in assembly dumps</li> 197b8e80941Smrg <li>aub - dump batches into an AUB trace for use with simulation tools</li> 198848b8605Smrg <li>bat - emit batch information</li> 199b8e80941Smrg <li>blit - emit messages about blit operations</li> 200b8e80941Smrg <li>blorp - emit messages about the blorp operations (blits & clears)</li> 201848b8605Smrg <li>buf - emit messages about buffer objects</li> 202b8e80941Smrg <li>clip - emit messages about the clip unit (for old gens, includes the CLIP program)</li> 203b8e80941Smrg <li>color - use color in output</li> 204b8e80941Smrg <li>cs - dump shader assembly for compute shaders</li> 205b8e80941Smrg <li>do32 - generate compute shader SIMD32 programs even if workgroup size doesn't exceed the SIMD16 limit</li> 206b8e80941Smrg <li>dri - emit messages about the DRI interface</li> 207848b8605Smrg <li>fbo - emit messages about framebuffers</li> 208848b8605Smrg <li>fs - dump shader assembly for fragment shaders</li> 209848b8605Smrg <li>gs - dump shader assembly for geometry shaders</li> 210b8e80941Smrg <li>hex - print instruction hex dump with the disassembly</li> 211b8e80941Smrg <li>l3 - emit messages about the new L3 state during transitions</li> 212b8e80941Smrg <li>miptree - emit messages about miptrees</li> 213b8e80941Smrg <li>no8 - don't generate SIMD8 fragment shader</li> 214b8e80941Smrg <li>no16 - suppress generation of 16-wide fragment shaders. useful for debugging broken shaders</li> 215b8e80941Smrg <li>nocompact - disable instruction compaction</li> 216b8e80941Smrg <li>nodualobj - suppress generation of dual-object geometry shader code</li> 217b8e80941Smrg <li>norbc - disable single sampled render buffer compression</li> 218b8e80941Smrg <li>optimizer - dump shader assembly to files at each optimization pass and iteration that make progress</li> 219b8e80941Smrg <li>perf - emit messages about performance issues</li> 220b8e80941Smrg <li>perfmon - emit messages about AMD_performance_monitor</li> 221b8e80941Smrg <li>pix - emit messages about pixel operations</li> 222848b8605Smrg <li>prim - emit messages about drawing primitives</li> 223b8e80941Smrg <li>reemit - mark all state dirty on each draw call</li> 224848b8605Smrg <li>sf - emit messages about the strips & fans unit (for old gens, includes the SF program)</li> 225b8e80941Smrg <li>shader_time - record how much GPU time is spent in each shader</li> 226b8e80941Smrg <li>spill_fs - force spilling of all registers in the scalar backend (useful to debug spilling code)</li> 227b8e80941Smrg <li>spill_vec4 - force spilling of all registers in the vec4 backend (useful to debug spilling code)</li> 228b8e80941Smrg <li>state - emit messages about state flag tracking</li> 229b8e80941Smrg <li>submit - emit batchbuffer usage statistics</li> 230b8e80941Smrg <li>sync - after sending each batch, emit a message and wait for that batch to finish rendering</li> 231b8e80941Smrg <li>tcs - dump shader assembly for tessellation control shaders</li> 232b8e80941Smrg <li>tes - dump shader assembly for tessellation evaluation shaders</li> 233b8e80941Smrg <li>tex - emit messages about textures.</li> 234848b8605Smrg <li>urb - emit messages about URB setup</li> 235b8e80941Smrg <li>vert - emit messages about vertex assembly</li> 236848b8605Smrg <li>vs - dump shader assembly for vertex shaders</li> 237848b8605Smrg</ul> 238b8e80941Smrg<li>INTEL_SCALAR_VS (or TCS, TES, GS) - force scalar/vec4 mode for a shader stage (Gen8-9 only)</li> 239b8e80941Smrg<li>INTEL_PRECISE_TRIG - if set to 1, true or yes, then the driver prefers 240b8e80941Smrg accuracy over performance in trig functions.</li> 241848b8605Smrg</ul> 242848b8605Smrg 243848b8605Smrg 244848b8605Smrg<h2>Radeon driver environment variables (radeon, r200, and r300g)</h2> 245848b8605Smrg 246848b8605Smrg<ul> 247848b8605Smrg<li>RADEON_NO_TCL - if set, disable hardware-accelerated Transform/Clip/Lighting. 248848b8605Smrg</ul> 249848b8605Smrg 250848b8605Smrg 251848b8605Smrg<h2>EGL environment variables</h2> 252848b8605Smrg 253848b8605Smrg<p> 254848b8605SmrgMesa EGL supports different sets of environment variables. See the 255848b8605Smrg<a href="egl.html">Mesa EGL</a> page for the details. 256848b8605Smrg</p> 257848b8605Smrg 258848b8605Smrg 259848b8605Smrg<h2>Gallium environment variables</h2> 260848b8605Smrg 261848b8605Smrg<ul> 262848b8605Smrg<li>GALLIUM_HUD - draws various information on the screen, like framerate, 263848b8605Smrg cpu load, driver statistics, performance counters, etc. 264848b8605Smrg Set GALLIUM_HUD=help and run e.g. glxgears for more info. 265b8e80941Smrg<li>GALLIUM_HUD_PERIOD - sets the hud update rate in seconds (float). Use zero 266b8e80941Smrg to update every frame. The default period is 1/2 second. 267b8e80941Smrg<li>GALLIUM_HUD_VISIBLE - control default visibility, defaults to true. 268b8e80941Smrg<li>GALLIUM_HUD_TOGGLE_SIGNAL - toggle visibility via user specified signal. 269b8e80941Smrg Especially useful to toggle hud at specific points of application and 270b8e80941Smrg disable for unencumbered viewing the rest of the time. For example, set 271b8e80941Smrg GALLIUM_HUD_VISIBLE to false and GALLIUM_HUD_TOGGLE_SIGNAL to 10 (SIGUSR1). 272b8e80941Smrg Use kill -10 <pid> to toggle the hud as desired. 273b8e80941Smrg<li>GALLIUM_HUD_DUMP_DIR - specifies a directory for writing the displayed 274b8e80941Smrg hud values into files. 275b8e80941Smrg<li>GALLIUM_DRIVER - useful in combination with LIBGL_ALWAYS_SOFTWARE=true for 276b8e80941Smrg choosing one of the software renderers "softpipe", "llvmpipe" or "swr". 277848b8605Smrg<li>GALLIUM_LOG_FILE - specifies a file for logging all errors, warnings, etc. 278848b8605Smrg rather than stderr. 279848b8605Smrg<li>GALLIUM_PRINT_OPTIONS - if non-zero, print all the Gallium environment 280848b8605Smrg variables which are used, and their current values. 281848b8605Smrg<li>GALLIUM_DUMP_CPU - if non-zero, print information about the CPU on start-up 282848b8605Smrg<li>TGSI_PRINT_SANITY - if set, do extra sanity checking on TGSI shaders and 283848b8605Smrg print any errors to stderr. 284848b8605Smrg<LI>DRAW_FSE - ??? 285848b8605Smrg<LI>DRAW_NO_FSE - ??? 286848b8605Smrg<li>DRAW_USE_LLVM - if set to zero, the draw module will not use LLVM to execute 287848b8605Smrg shaders, vertex fetch, etc. 288848b8605Smrg<li>ST_DEBUG - controls debug output from the Mesa/Gallium state tracker. 289848b8605SmrgSetting to "tgsi", for example, will print all the TGSI shaders. 290848b8605SmrgSee src/mesa/state_tracker/st_debug.c for other options. 291848b8605Smrg</ul> 292848b8605Smrg 293b8e80941Smrg<h3>Clover state tracker environment variables</h3> 294b8e80941Smrg 295b8e80941Smrg<ul> 296b8e80941Smrg<li>CLOVER_EXTRA_BUILD_OPTIONS - allows specifying additional compiler and linker 297b8e80941Smrg options. Specified options are appended after the options set by the OpenCL 298b8e80941Smrg program in clBuildProgram. 299b8e80941Smrg<li>CLOVER_EXTRA_COMPILE_OPTIONS - allows specifying additional compiler 300b8e80941Smrg options. Specified options are appended after the options set by the OpenCL 301b8e80941Smrg program in clCompileProgram. 302b8e80941Smrg<li>CLOVER_EXTRA_LINK_OPTIONS - allows specifying additional linker 303b8e80941Smrg options. Specified options are appended after the options set by the OpenCL 304b8e80941Smrg program in clLinkProgram. 305b8e80941Smrg</ul> 306b8e80941Smrg 307b8e80941Smrg 308848b8605Smrg<h3>Softpipe driver environment variables</h3> 309848b8605Smrg<ul> 310848b8605Smrg<li>SOFTPIPE_DUMP_FS - if set, the softpipe driver will print fragment shaders 311848b8605Smrg to stderr 312848b8605Smrg<li>SOFTPIPE_DUMP_GS - if set, the softpipe driver will print geometry shaders 313848b8605Smrg to stderr 314848b8605Smrg<li>SOFTPIPE_NO_RAST - if set, rasterization is no-op'd. For profiling purposes. 315848b8605Smrg<li>SOFTPIPE_USE_LLVM - if set, the softpipe driver will try to use LLVM JIT for 316848b8605Smrg vertex shading processing. 317848b8605Smrg</ul> 318848b8605Smrg 319848b8605Smrg 320848b8605Smrg<h3>LLVMpipe driver environment variables</h3> 321848b8605Smrg<ul> 322848b8605Smrg<li>LP_NO_RAST - if set LLVMpipe will no-op rasterization 323848b8605Smrg<li>LP_DEBUG - a comma-separated list of debug options is accepted. See the 324848b8605Smrg source code for details. 325848b8605Smrg<li>LP_PERF - a comma-separated list of options to selectively no-op various 326848b8605Smrg parts of the driver. See the source code for details. 327848b8605Smrg<li>LP_NUM_THREADS - an integer indicating how many threads to use for rendering. 328b8e80941Smrg Zero turns off threading completely. The default value is the number of CPU 329848b8605Smrg cores present. 330848b8605Smrg</ul> 331848b8605Smrg 332848b8605Smrg<h3>VMware SVGA driver environment variables</h3> 333848b8605Smrg<ul> 334848b8605Smrg<li>SVGA_FORCE_SWTNL - force use of software vertex transformation 335848b8605Smrg<li>SVGA_NO_SWTNL - don't allow software vertex transformation fallbacks 336848b8605Smrg(will often result in incorrect rendering). 337848b8605Smrg<li>SVGA_DEBUG - for dumping shaders, constant buffers, etc. See the code 338848b8605Smrgfor details. 339b8e80941Smrg<li>SVGA_EXTRA_LOGGING - if set, enables extra logging to the vmware.log file, 340b8e80941Smrgsuch as the OpenGL program's name and command line arguments. 341b8e80941Smrg<li>SVGA_NO_LOGGING - if set, disables logging to the vmware.log file. 342b8e80941SmrgThis is useful when using Valgrind because it otherwise crashes when 343b8e80941Smrginitializing the host log feature. 344848b8605Smrg<li>See the driver code for other, lesser-used variables. 345848b8605Smrg</ul> 346848b8605Smrg 347b8e80941Smrg<h3>WGL environment variables</h3> 348b8e80941Smrg<ul> 349b8e80941Smrg<li>WGL_SWAP_INTERVAL - to set a swap interval, equivalent to calling 350b8e80941SmrgwglSwapIntervalEXT() in an application. If this environment variable 351b8e80941Smrgis set, application calls to wglSwapIntervalEXT() will have no effect. 352b8e80941Smrg</ul> 353b8e80941Smrg 354b8e80941Smrg<h3>VA-API state tracker environment variables</h3> 355b8e80941Smrg<ul> 356b8e80941Smrg<li>VAAPI_MPEG4_ENABLED - enable MPEG4 for VA-API, disabled by default. 357b8e80941Smrg</ul> 358b8e80941Smrg 359b8e80941Smrg 360b8e80941Smrg<h3>VC4 driver environment variables</h3> 361b8e80941Smrg<ul> 362b8e80941Smrg<li>VC4_DEBUG - a comma-separated list of named flags, which do various things: 363b8e80941Smrg<ul> 364b8e80941Smrg <li>cl - dump command list during creation</li> 365b8e80941Smrg <li>qpu - dump generated QPU instructions</li> 366b8e80941Smrg <li>qir - dump QPU IR during program compile</li> 367b8e80941Smrg <li>nir - dump NIR during program compile</li> 368b8e80941Smrg <li>tgsi - dump TGSI during program compile</li> 369b8e80941Smrg <li>shaderdb - dump program compile information for shader-db analysis</li> 370b8e80941Smrg <li>perf - print during performance-related events</li> 371b8e80941Smrg <li>norast - skip actual hardware execution of commands</li> 372b8e80941Smrg <li>always_flush - flush after each draw call</li> 373b8e80941Smrg <li>always_sync - wait for finish after each flush</li> 374b8e80941Smrg <li>dump - write a GPU command stream trace file (VC4 simulator only)</li> 375b8e80941Smrg</ul> 376b8e80941Smrg</ul> 377b8e80941Smrg 378848b8605Smrg 379848b8605Smrg<p> 380848b8605SmrgOther Gallium drivers have their own environment variables. These may change 381848b8605Smrgfrequently so the source code should be consulted for details. 382848b8605Smrg</p> 383848b8605Smrg 384848b8605Smrg</div> 385848b8605Smrg</body> 386848b8605Smrg</html> 387