1. Stella Environmental Driver Jobs
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4. Drivers Nvidia Gtx 1050 Ti

Normally, no environment variables need to be set. Most of theenvironment variables used by Mesa/Gallium are for debugging purposes,but they can sometimes be useful for debugging end-user issues.

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LibGL environment variables¶

If defined debug information will be printed to stderr. If set toverbose additional information will be printed.

colon-separated list of paths to search for DRI drivers

if set to true, forces an indirect rendering context/connection.

if set to true, always use software rendering

if set to true, do not use DrawArrays GLX protocol (fordebugging)

print framerate to stdout based on the number of glXSwapBufferscalls per second.

disable DRI2 if set to true.

disable DRI3 if set to true.

Core Mesa environment variables¶

if set, disables all assembly language optimizations

if set, disables Intel MMX optimizations

if set, disables AMD 3DNow! optimizations

if set, disables Intel SSE optimizations

if set to 1, error checking is disabled as per KHR_no_error. Thiswill result in undefined behavior for invalid use of the API, butcan reduce CPU use for apps that are known to be error free.

if set, error messages are printed to stderr. For example, if theapplication generates a GL_INVALID_ENUM error, a correspondingerror message indicating where the error occurred, and possibly why,will be printed to stderr. For release builds, MESA_DEBUGdefaults to off (no debug output). MESA_DEBUG accepts thefollowing comma-separated list of named flags, which adds extrabehavior to just set MESA_DEBUG=1:

turn off debug messages. Only useful for debug builds.

flush after each drawing command

extra debug messages when a texture is incomplete

extra debug messages when a FBO is incomplete

create a debug context (see GLX_CONTEXT_DEBUG_BIT_ARB) andprint error and performance messages to stderr (orMESA_LOG_FILE).

specifies a file name for logging all errors, warnings, etc., ratherthan stderr

if set, implement conventional texture env modes with fragmentprograms (intended for developers only)

if set, implement conventional vertex transformation operations withvertex programs (intended for developers only). Setting this variableautomatically sets the MESA_TEX_PROG variable as well.

can be used to enable/disable extensions. A value such asGL_EXT_foo-GL_EXT_bar will enable the GL_EXT_foo extensionand disable the GL_EXT_bar extension.

The GL_EXTENSIONS string returned by Mesa is sorted by extensionyear. If this variable is set to year X, only extensions defined onor before year X will be reported. This is to work-around a bug insome games where the extension string is copied into a fixed-sizebuffer without truncating. If the extension string is too long, thebuffer overrun can cause the game to crash. This is a work-around forthat.

changes the value returned by glGetString(GL_VERSION) andpossibly the GL API type.

• The format should be MAJOR.MINOR[FC|COMPAT]

• FC is an optional suffix that indicates a forward compatiblecontext. This is only valid for versions >= 3.0.

• COMPAT is an optional suffix that indicates a compatibilitycontext or GL_ARB_compatibility support. This is only validfor versions >= 3.1.

• GL versions <= 3.0 are set to a compatibility (non-Core) profile

• GL versions = 3.1, depending on the driver, it may or may not havethe ARB_compatibility extension enabled.

• GL versions >= 3.2 are set to a Core profile

• Examples:

  2.1

  select a compatibility (non-Core) profile with GL version 2.1.

  3.0

  select a compatibility (non-Core) profile with GL version 3.0.

  3.0FC

  select a Core+Forward Compatible profile with GL version 3.0.

  3.1

  select GL version 3.1 with GL_ARB_compatibility enabled perthe driver default.

  3.1FC

  select GL version 3.1 with forward compatibility andGL_ARB_compatibility disabled.

  3.1COMPAT

  select GL version 3.1 with GL_ARB_compatibility enabled.

  X.Y

  override GL version to X.Y without changing the profile.

  X.YFC

  select a Core+Forward Compatible profile with GL version X.Y.

  X.YCOMPAT

  select a Compatibility profile with GL version X.Y.

• Mesa may not really implement all the features of the givenversion. (for developers only)

changes the value returned by glGetString(GL_VERSION) for OpenGLES.

• The format should be MAJOR.MINOR

• Examples: 2.0, 3.0, 3.1

• Mesa may not really implement all the features of the givenversion. (for developers only)

changes the value returned byglGetString(GL_SHADING_LANGUAGE_VERSION). Valid values areintegers, such as 130. Mesa will not really implement all thefeatures of the given language version if it’s higher than what’snormally reported. (for developers only)

if set to true, disables the GLSL shader cache. If set tofalse, enables the GLSL shader cache when it is disabled bydefault.

if set, determines the maximum size of the on-disk cache of compiledGLSL programs. Should be set to a number optionally followed byK, M, or G to specify a size in kilobytes, megabytes, orgigabytes. By default, gigabytes will be assumed. And if unset, amaximum size of 1GB will be used.

Note

A separate cache might be created for each architecture that Mesa isinstalled for on your system. For example under the default settingsyou may end up with a 1GB cache for x86_64 and another 1GB cache fori386.

if set, determines the directory to be used for the on-disk cache ofcompiled GLSL programs. If this variable is not set, then the cachewill be stored in $XDG_CACHE_HOME/mesa_shader_cache (if thatvariable is set), or else within .cache/mesa_shader_cache withinthe user’s home directory.

when set, the minmax index cache is globally disabled.

see Capturing Shaders

see Experimenting with ShaderReplacements

changes the Vulkan physical device version as returned inVkPhysicalDeviceProperties::apiVersion.

• The format should be MAJOR.MINOR[.PATCH]

• This will not let you force a version higher than the driver’sinstance version as advertised by vkEnumerateInstanceVersion

• This can be very useful for debugging but some features may not beimplemented correctly. (For developers only)

chooses a different driver binary such as etnaviv or zink.

NIR passes environment variables¶

The following are only applicable for drivers that uses NIR, as theymodify the behavior for the common NIR_PASS and NIR_PASS_V macros, thatwrap calls to NIR lowering/optimizations.

If defined, the resulting NIR shader will be printed out at eachsuccessful NIR lowering/optimization call.

If defined, cloning a NIR shader would be tested at each successfulNIR lowering/optimization call.

If defined, serialize and deserialize a NIR shader would be tested ateach successful NIR lowering/optimization call.

Mesa Xlib driver environment variables¶

The following are only applicable to the Mesa Xlib software driver. Seethe Xlib software driver page for details.

specifies the X visual and depth for RGB mode

specifies the X visual and depth for CI mode

specifies how to implement the back color buffer, either pixmapor ximage

gamma correction coefficients for red, green, blue channels

enable synchronous X behavior (for debugging only)

if set, force GLX to treat 8 BPP visuals as CI visuals

if set, forces RGB windows to have an alpha channel.

specifies default number of bits for depth buffer.

specifies default number of bits for alpha channel.

i945/i965 driver environment variables (non-Gallium)¶

if set to 1, prevents batches from being submitted to the hardware.This is useful for debugging hangs, etc.

a comma-separated list of named flags, which do various things:

annotate IR in assembly dumps

dump batches into an AUB trace for use with simulation tools

emit batch information

emit messages about blit operations

emit messages about the blorp operations (blits & clears)

emit messages about buffer objects

emit messages about the clip unit (for old gens, includes the CLIPprogram)

use color in output

dump shader assembly for compute shaders

generate compute shader SIMD32 programs even if workgroup sizedoesn’t exceed the SIMD16 limit

emit messages about the DRI interface

emit messages about framebuffers

dump shader assembly for fragment shaders

dump shader assembly for geometry shaders

print instruction hex dump with the disassembly

emit messages about the new L3 state during transitions

emit messages about miptrees

don’t generate SIMD8 fragment shader

suppress generation of 16-wide fragment shaders. useful fordebugging broken shaders

disable instruction compaction

suppress generation of dual-object geometry shader code

disable fast clears

disable single sampled render buffer compression

dump shader assembly to files at each optimization pass anditeration that make progress

emit messages about performance issues

emit messages about AMD_performance_monitor

emit messages about pixel operations

emit messages about drawing primitives

mark all state dirty on each draw call

emit messages about the strips & fans unit (for old gens, includesthe SF program)

record how much GPU time is spent in each shader

force spilling of all registers in the scalar backend (useful todebug spilling code)

force spilling of all registers in the vec4 backend (useful todebug spilling code)

emit messages about state flag tracking

emit batchbuffer usage statistics

after sending each batch, emit a message and wait for that batchto finish rendering

dump shader assembly for tessellation control shaders

dump shader assembly for tessellation evaluation shaders

emit messages about textures.

emit messages about URB setup

emit messages about vertex assembly

dump shader assembly for vertex shaders

force scalar/vec4 mode for a shader stage (Gen8-9 only)

if set to 1, true or yes, then the driver prefers accuracy overperformance in trig functions.

if set, determines the directory to be used for overriding shaderassembly. The binaries with custom assembly should be placed inthis folder and have a name formatted as sha1_of_assembly.bin.The sha1 of a shader assembly is printed when assembly is dumped viacorresponding INTEL_DEBUG flag (e.g. vs for vertex shader).A binary could be generated from a dumped assembly by i965_asm.For INTEL_SHADER_ASM_READ_PATH to work it is necessary to enabledumping of corresponding shader stages via INTEL_DEBUG.It is advised to use nocompact flag of INTEL_DEBUG whendumping and overriding shader assemblies.The success of assembly override would be signified by “Successfullyoverrode shader with sha1 <sha1>” in stderr replacing the originalassembly.

if set to 1, true or yes, then the OpenGL implementation willdefault GL_BLACKHOLE_RENDER_INTEL to true, thus disabling anyrendering.

Radeon driver environment variables (radeon, r200, and r300g)¶

if set, disable hardware-accelerated Transform/Clip/Lighting.

EGL environment variables¶

Mesa EGL supports different sets of environment variables. See theMesa EGL page for the details.

Gallium environment variables¶

draws various information on the screen, like framerate, CPU load,driver statistics, performance counters, etc. SetGALLIUM_HUD=help and run e.g. glxgears for more info.

sets the HUD update rate in seconds (float). Use zero to update everyframe. The default period is 1/2 second.

control default visibility, defaults to true.

toggle visibility via user specified signal. Especially useful totoggle HUD at specific points of application and disable forunencumbered viewing the rest of the time. For example, setGALLIUM_HUD_VISIBLE to false andGALLIUM_HUD_TOGGLE_SIGNAL to 10 (SIGUSR1). Usekill-10<pid> to toggle the HUD as desired.

Scale HUD by an integer factor, for high DPI displays. Default is 1.

specifies a directory for writing the displayed HUD values intofiles.

useful in combination with LIBGL_ALWAYS_SOFTWARE=true forchoosing one of the software renderers softpipe, llvmpipe orswr.

specifies a file for logging all errors, warnings, etc. rather thanstderr.

specifies an alternate search directory for pipe-loader which overridesthe compile-time path based on the install location.

if non-zero, print all the Gallium environment variables which areused, and their current values.

if non-zero, print information about the CPU on start-up

if set, do extra sanity checking on TGSI shaders and print any errorsto stderr.

???

???

if set to zero, the draw module will not use LLVM to execute shaders,vertex fetch, etc.

controls debug output from the Mesa/Gallium state tracker. Setting totgsi, for example, will print all the TGSI shaders. Seesrc/mesa/state_tracker/st_debug.c for other options.

Clover environment variables¶

allows specifying additional compiler and linker options. Specifiedoptions are appended after the options set by the OpenCL program inclBuildProgram.

allows specifying additional compiler options. Specified options areappended after the options set by the OpenCL program inclCompileProgram.

allows specifying additional linker options. Specified options areappended after the options set by the OpenCL program inclLinkProgram.

Softpipe driver environment variables¶

a comma-separated list of named flags, which do various things:

Dump vertex shader assembly to stderr

Dump fragment shader assembly to stderr

Dump geometry shader assembly to stderr

Dump compute shader assembly to stderr

rasterization is no-op’d. For profiling purposes.

the softpipe driver will try to use LLVM JIT for vertexshading processing.

if set, the softpipe driver will ask to directly consume TGSI, insteadof NIR.

LLVMpipe driver environment variables¶

if set LLVMpipe will no-op rasterization

a comma-separated list of debug options is accepted. See the sourcecode for details.

a comma-separated list of options to selectively no-op various partsof the driver. See the source code for details.

an integer indicating how many threads to use for rendering. Zeroturns off threading completely. The default value is the number ofCPU cores present.

VMware SVGA driver environment variables¶

force use of software vertex transformation

don’t allow software vertex transformation fallbacks (will oftenresult in incorrect rendering).

for dumping shaders, constant buffers, etc. See the code for details.

if set, enables extra logging to the vmware.log file, such as theOpenGL program’s name and command line arguments.

if set, disables logging to the vmware.log file. This is usefulwhen using Valgrind because it otherwise crashes when initializingthe host log feature.

See the driver code for other, lesser-used variables.

WGL environment variables¶

to set a swap interval, equivalent to callingwglSwapIntervalEXT() in an application. If this environmentvariable is set, application calls to wglSwapIntervalEXT() willhave no effect.

VA-API environment variables¶

enable MPEG4 for VA-API, disabled by default.

VC4 driver environment variables¶

a comma-separated list of named flags, which do various things:

dump command list during creation

dump generated QPU instructions

dump QPU IR during program compile

dump NIR during program compile

dump TGSI during program compile

dump program compile information for shader-db analysis

print during performance-related events

skip actual hardware execution of commands

flush after each draw call

wait for finish after each flush

write a GPU command stream trace file (VC4 simulator only)

RADV driver environment variables¶

a comma-separated list of named flags, which do various things:

enable LLVM compiler backend

force all allocated buffers to be referenced in submissions

validate the LLVM IR before LLVM compiles the shader

display more info about errors

Enables DCC,FMASK,CMASK,HTILE in situations where the driver supports itbut normally does not deem it beneficial.

enable GPU hangs detection and dump a report to$HOME/radv_dumps_<pid>_<time> if a GPU hang is detected

Print image info

show GPU-related information

Mark geometry-affecting outputs as invariant. This works around a commonclass of application bugs appearing as flickering.

dump internal meta shaders

disable primitive binning

disable shaders cache

disable compute queue

disable Delta Color Compression (DCC) on images

do not check OOB access for dynamic descriptors

disable fast color/depthstencil clears

disable HIZ for depthstencil images

disable directly recording command buffers in GPU-visible memory

disable memory shaders cache

disable NGG for GFX10+

disable out-of-order rasterization

disable LLVM threaded compilation

disable UMR dumps during GPU hang detection (only with RADV_DEBUG=hang)

dump LLVM IR before any optimizations

dump shaders

dump shader statistics

Stella Environmental Driver Jobs

dump SPIR-V

display info at startup

synchronize shaders after all draws/dispatches

check for VM memory faults via dmesg

initialize all memory allocated in VRAM as zero

create a null device to compile shaders without a AMD GPU (e.g.gfx900)

a comma-separated list of named flags, which do various things:

enable the global BO list

enable wave32 for compute shaders (GFX10+)

enable DCC for MSAA images

enable dfsm

enable wave32 for vertex/tess/geometry shaders (GFX10+)

enable local BOs

disable optimizations that get enabled when all VRAM is CPU visible.

enable wave32 for pixel shaders (GFX10+)

enable TC-compat cmask for MSAA images

force anisotropy filter (up to 16)

a comma-separated list of named flags, which do various things:

validate the ACO IR at various points of compilation (enabled bydefault for debug/debugoptimized builds)

validate register assignment of ACO IR and catches many RA bugs

abort on some suboptimal code generation

force emitting waitcnt states if there is something to wait for

disable value numbering

disable various optimizations

disable instructions scheduling

radeonsi driver environment variables¶

a comma-separated list of named flags, which do various things:

Disable DCC.

Disable DCC fast clear.

Disable separate DCC on the main framebuffer

Disable DCC for MSAA

Disable DPBB.

Disable DFSM.

Disable tiling

Disable MSAA compression

Disable Hyper-Z

Disable 2D tiling

Print driver information

Print texture info

Print compute info

Print virtual addresses when creating resources

Print vertex shaders

Print pixel shaders

Print geometry shaders

Print tessellation control shaders

Print tessellation evaluation shaders

Print compute shaders

Don’t print the LLVM IR

Don’t print NIR when printing shaders

Don’t print disassembled shaders

Print the LLVM IR before initial optimizations

Enable LLVM global instruction selector.

Use Wave32 for vertex, tessellation, and geometry shaders.

Use Wave32 for pixel shaders.

Use Wave32 for computes shaders.

Use Wave64 for vertex, tessellation, and geometry shaders.

Use Wave64 for pixel shaders.

Use Wave64 for computes shaders.

Enable additional sanity checks on shader IR

Use old-style monolithic shaders compiled on demand

Disable compiling optimized shader variants.

Disable GTT write combining

Check VM faults and dump debug info.

Force VMID reservation per context.

Disable graphics. Only multimedia compute paths can be used.

Disable NGG and use the legacy pipeline.

Drivers Nvidia Download

Always use NGG culling even when it can hurt.

Disable NGG culling.

Always enable the primitive discard compute shader.

Environmental Change Statistics

Enable the primitive discard compute shader for large draw calls.

Disable the primitive discard compute shader.

Program WD/IA to switch on end-of-packet.

Disable out-of-order rasterization

Enable DPBB.

Enable DFSM.

Drivers Nvidia Gtx 1050 Ti

Other Gallium drivers have their own environment variables. These maychange frequently so the source code should be consulted for details.