Environment Variables¶
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.
LibGL environment variables¶
- LIBGL_DEBUG¶
If defined debug information will be printed to stderr. If set to
verbose
additional information will be printed.
- LIBGL_ALWAYS_INDIRECT¶
if set to
true
, forces an indirect rendering context/connection.
- LIBGL_ALWAYS_SOFTWARE¶
if set to
true
, always use software rendering
- LIBGL_NO_DRAWARRAYS¶
if set to
true
, do not use DrawArrays GLX protocol (for debugging)
- LIBGL_DRI2_DISABLE¶
disable DRI2 if set to
true
.
- LIBGL_DRI3_DISABLE¶
disable DRI3 if set to
true
.
- LIBGL_KOPPER_DISABLE¶
disable Vulkan swapchains with Zink if set to
true
. In general, this should not be used unless you know what you are doing. Some examples of “knowing what you are doing” include: - using a VK driver which has no WSI implementation for your display server - profiling the DRI frontend against your VK driver’s WSI implementation
- LIBGL_KOPPER_DRI2¶
disable DRI3 with Zink if set to
true
. In general, this should not be used unless you know what you are doing. Some examples of “knowing what you are doing” include: - running xrdp - using a VK driver which doesn’t support modifiers
Core Mesa environment variables¶
- MESA_NO_ERROR¶
if set to 1, error checking is disabled as per GL_KHR_no_error. This will result in undefined behavior for invalid use of the API, but can reduce CPU use for apps that are known to be error free.
- 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 occurred, and possibly why, will be printed to stderr. For release builds,MESA_DEBUG
defaults to off (no debug output).MESA_DEBUG
accepts the following comma-separated list of named flags, which adds extra behavior to just setMESA_DEBUG
to1
:silent
turn off debug messages. Only useful for debug builds.
flush
flush after each drawing command
incomplete_tex
extra debug messages when a texture is incomplete
incomplete_fbo
extra debug messages when a FBO is incomplete
context
create a debug context (see
GLX_CONTEXT_DEBUG_BIT_ARB
) and print error and performance messages to stderr (orMESA_LOG_FILE
).
- MESA_PROCESS_NAME¶
if set, overrides the process name string used internally for various purposes (e.g. for driconf option matching, logging, artifact storage, etc.).
- MESA_LOG_FILE¶
specifies a file name for logging all errors, warnings, etc., rather than stderr
- MESA_EXTENSION_OVERRIDE¶
can be used to enable/disable extensions. A value such as
GL_EXT_foo -GL_EXT_bar
will enable theGL_EXT_foo
extension and disable theGL_EXT_bar
extension. Note that this will override extensions override configured using driconf.
- 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.
- MESA_GL_VERSION_OVERRIDE¶
changes the value returned by
glGetString(GL_VERSION)
and possibly the GL API type.The format should be
MAJOR.MINOR[FC|COMPAT]
FC
is an optional suffix that indicates a forward compatible context. This is only valid for versions >= 3.0.COMPAT
is an optional suffix that indicates a compatibility context or GL_ARB_compatibility support. This is only valid for 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 have the GL_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 per the driver default.
3.1FC
select GL version 3.1 with forward compatibility and GL_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 given version. (for developers only)
- MESA_GLES_VERSION_OVERRIDE¶
changes the value returned by
glGetString(GL_VERSION)
for OpenGL ES.The format should be
MAJOR.MINOR
Examples:
2.0
,3.0
,3.1
Mesa may not really implement all the features of the given version. (for developers only)
- MESA_GLSL_VERSION_OVERRIDE¶
changes the value returned by
glGetString(GL_SHADING_LANGUAGE_VERSION)
. Valid values are integers, such as130
. Mesa will not really implement all the features of the given language version if it’s higher than what’s normally reported. (for developers only)
- MESA_DRICONF_EXECUTABLE_OVERRIDE¶
if set, overrides the “executable” string used specifically for driconf option matching. This takes higher precedence over more general process name override (e.g. MESA_PROCESS_NAME).
- MESA_SHADER_CACHE_DISABLE¶
if set to
true
, disables the on-disk shader cache. If set tofalse
, enables the on-disk shader cache when it is disabled by default. Note that EGL_ANDROID_blob_cache is still enabled even if on-disk shader cache is disabled.
- MESA_SHADER_CACHE_MAX_SIZE¶
if set, determines the maximum size of the on-disk cache of compiled shader programs. Should be set to a number optionally followed by
K
,M
, orG
to specify a size in kilobytes, megabytes, or gigabytes. By default, gigabytes will be assumed. And if unset, a maximum size of 1GB will be used.NoteA separate cache might be created for each architecture that Mesa is installed for on your system. For example under the default settings you may end up with a 1GB cache for x86_64 and another 1GB cache for i386.
- MESA_SHADER_CACHE_DIR¶
if set, determines the directory to be used for the on-disk cache of compiled shader programs. If this variable is not set, then the cache will be stored in
$XDG_CACHE_HOME/mesa_shader_cache_db
(if that variable is set), or else within.cache/mesa_shader_cache_db
within the user’s home directory.
- MESA_SHADER_CACHE_SHOW_STATS¶
if set to
true
, keeps hit/miss statistics for the shader cache. These statistics are printed when the app terminates.
- MESA_DISK_CACHE_SINGLE_FILE¶
if set to 1, enables the single file Fossilize DB on-disk shader cache implementation instead of the default Mesa-DB cache implementation. This implementation allows for loading of precompiled cache DBs via
MESA_DISK_CACHE_READ_ONLY_FOZ_DBS
orMESA_DISK_CACHE_READ_ONLY_FOZ_DBS_DYNAMIC_LIST
. This implementation does not support cache size limits viaMESA_SHADER_CACHE_MAX_SIZE
. IfMESA_SHADER_CACHE_DIR
is not set, the cache will be stored in$XDG_CACHE_HOME/mesa_shader_cache_sf
(if that variable is set) or else within.cache/mesa_shader_cache_sf
within the user’s home directory.
- MESA_DISK_CACHE_MULTI_FILE¶
if set to 1, enables the multi file on-disk shader cache implementation instead of the default Mesa-DB cache implementation. This implementation increases the overall disk usage. If
MESA_SHADER_CACHE_DIR
is not set, the cache will be stored in$XDG_CACHE_HOME/mesa_shader_cache
(if that variable is set) or else within.cache/mesa_shader_cache
within the user’s home directory.
- MESA_DISK_CACHE_READ_ONLY_FOZ_DBS¶
if set with
MESA_DISK_CACHE_SINGLE_FILE
enabled, references a string of comma separated file paths to read only Fossilize DB shader caches for loading at initialization. The file paths are relative to the cache directory and do not include suffixes, referencing both the cache DB and its index file. E.g.MESA_DISK_CACHE_SINGLE_FILE=filename1
refers tofilename1.foz
andfilename1_idx.foz
. A limit of 8 DBs can be loaded and this limit is shared withMESA_DISK_CACHE_READ_ONLY_FOZ_DBS_DYNAMIC_LIST
.
- MESA_DISK_CACHE_DATABASE_NUM_PARTS¶
specifies number of mesa-db cache parts, default is 50.
- MESA_DISK_CACHE_DATABASE_EVICTION_SCORE_2X_PERIOD¶
Mesa-DB cache eviction algorithm calculates weighted score for the cache items. The weight is doubled based on the last access time of cache entry. By default period of weight doubling is set to one month. Period value is given in seconds.
- MESA_DISK_CACHE_READ_ONLY_FOZ_DBS_DYNAMIC_LIST¶
if set with
MESA_DISK_CACHE_SINGLE_FILE
enabled, references a text file that contains a new-line separated list of read only Fossilize DB shader caches to load. The list file is modifiable at runtime to allow for loading read only caches after initialization unlikeMESA_DISK_CACHE_READ_ONLY_FOZ_DBS
. This variable takes an absolute path to the list file. The list file must exist at initialization for updating to occur. Cache files in the list take relative paths to the current cache directory likeMESA_DISK_CACHE_READ_ONLY_FOZ_DBS
. A limit of 8 DBs can be loaded and this limit is shared withMESA_DISK_CACHE_READ_ONLY_FOZ_DBS
.
- MESA_DISK_CACHE_COMBINE_RW_WITH_RO_FOZ¶
if set to 1, enables simultaneous use of RW and RW Fossilize DB caches. At first, data will be retrieved from the RO Fossilize cache. If data isn’t found in the RO cache, then it will be retrieved from the RW cache.
- MESA_GLSL¶
- MESA_NO_MINMAX_CACHE¶
when set, the minmax index cache is globally disabled.
- MESA_SHADER_CAPTURE_PATH¶
- MESA_SHADER_DUMP_PATH¶
- MESA_SHADER_READ_PATH¶
- MESA_VK_VERSION_OVERRIDE¶
changes the Vulkan physical device version as returned in
VkPhysicalDeviceProperties::apiVersion
.The format should be
MAJOR.MINOR[.PATCH]
This will not let you force a version higher than the driver’s instance version as advertised by
vkEnumerateInstanceVersion
This can be very useful for debugging but some features may not be implemented correctly. (For developers only)
- MESA_VK_WSI_PRESENT_MODE¶
overrides the WSI present mode clients specify in
VkSwapchainCreateInfoKHR::presentMode
. Values can befifo
,relaxed
,mailbox
orimmediate
.
- MESA_VK_WSI_HEADLESS_SWAPCHAIN¶
Forces all swapchains to be headless (no rendering will be display in the swapchain’s window).
- MESA_VK_ABORT_ON_DEVICE_LOSS¶
causes the Vulkan driver to call abort() immediately after detecting a lost device. This is extremely useful when testing as it prevents the test suite from continuing on with a lost device.
- MESA_VK_ENABLE_SUBMIT_THREAD¶
for Vulkan drivers which support real timeline semaphores, this forces them to use a submit thread from the beginning, regardless of whether or not they ever see a wait-before-signal condition.
- MESA_VK_DEVICE_SELECT_DEBUG¶
print debug info about device selection decision-making
- MESA_VK_TRACE¶
A comma-separated list of trace types used for offline analysis. The option names are equal to the file extension. Traces are dumped into
/tmp
. Captures can be triggered by pressingF1
with the application window focused (Currently X11 only) or viaMESA_VK_TRACE_FRAME
andMESA_VK_TRACE_TRIGGER
.File extension
Offline analysis tool
Supported drivers
rmv
Radeon Memory Visualizer
RADV
rgp
Radeon GPU Profiler
RADV
rra
Radeon Raytracing Analyzer
RADV
ctxroll
Context rolls
RADV
Creating RMV captures requires the
scripts/setup.sh
script in the Radeon Developer Tools folder to be run beforehand
- MESA_VK_TRACE_FRAME¶
Specifies a frame index at which a trace capture is automatically triggered.
- MESA_VK_TRACE_TRIGGER¶
Specifies a trigger file. Creating the file triggers the capture. (e.g.
export MESA_VK_TRACE_TRIGGER=/tmp/trigger
and thentouch /tmp/trigger
)
- MESA_LOADER_DRIVER_OVERRIDE¶
chooses a different driver binary such as
etnaviv
orzink
.
- DRI_PRIME_DEBUG¶
print debug info about device selection decision-making
- DRI_PRIME¶
the default GPU is the one used by Wayland/Xorg or the one connected to a display. This variable allows to select a different GPU. It applies to OpenGL and Vulkan (in this case “select” means the GPU will be first in the reported physical devices list). The supported syntaxes are:
DRI_PRIME=N
: selects the Nth non-default GPU (N > 0).DRI_PRIME=pci-0000_02_00_0
: selects the GPU connected to this PCIe busDRI_PRIME=vendor_id:device_id
: selects the first GPU matching these ids.
For Vulkan it’s possible to append
!
, in which case only the selected GPU will be exposed to the application (e.g.: DRI_PRIME=1!).Notelspci -nn | grep VGA
can be used to know the PCIe bus or ids to use.
- DRIRC_CONFIGDIR¶
If set, overrides the global search-directories used when searching for drirc config files. The user-local one will still be used. Mostly useful for internal debugging.
NIR passes environment variables¶
The following are only applicable for drivers that uses NIR, as they
modify the behavior for the common NIR_PASS
and NIR_PASS_V
macros,
that wrap calls to NIR lowering/optimizations.
- NIR_DEBUG¶
a comma-separated list of debug options to apply to NIR shaders. Use
NIR_DEBUG=help
to print a list of available options.
- NIR_SKIP¶
a comma-separated list of optimization/lowering passes to skip.
Mesa Xlib driver environment variables¶
The following are only applicable to the Mesa Xlib software driver. See the Xlib software driver page for details.
- MESA_RGB_VISUAL¶
specifies the X visual and depth for RGB mode
- MESA_BACK_BUFFER¶
specifies how to implement the back color buffer, either
pixmap
orximage
- MESA_XSYNC¶
enable synchronous X behavior (for debugging only)
- MESA_GLX_FORCE_ALPHA¶
if set, forces RGB windows to have an alpha channel.
- MESA_GLX_DEPTH_BITS¶
specifies default number of bits for depth buffer.
- MESA_GLX_ALPHA_BITS¶
specifies default number of bits for alpha channel.
Mesa WGL driver environment variables¶
The following are only applicable to the Mesa WGL driver, which is in use on Windows.
- WGL_FORCE_MSAA¶
if set to a positive value, specifies the number of MSAA samples to force when choosing the display configuration.
- WGL_DISABLE_ERROR_DIALOGS¶
if set to 1, true or yes, disables Win32 error dialogs. Useful for automated test-runs.
Intel driver environment variables¶
- INTEL_BLACKHOLE_DEFAULT¶
if set to 1, true or yes, then the OpenGL implementation will default
GL_BLACKHOLE_RENDER_INTEL
to true, thus disabling any rendering.
- INTEL_DEBUG¶
a comma-separated list of named flags, which do various things:
ann
annotate IR in assembly dumps
bat
emit batch information. Can control in which frames batches get dumped using
INTEL_DEBUG_BATCH_FRAME_*
, whereINTEL_DEBUG_BATCH_FRAME_START
<= frame <INTEL_DEBUG_BATCH_FRAME_STOP
blit
emit messages about blit operations
blorp
emit messages about the blorp operations (blits & clears)
buf
emit messages about buffer objects
bt
emit messages binding tables
capture-all
flag all buffers to be captured by the kernel driver when generating an error stage after a GPU hang
clip
emit messages about the clip unit (for old gens, includes the CLIP program)
color
use color in output
cs
dump shader assembly for compute shaders
do32
generate compute shader SIMD32 programs even if workgroup size doesn’t exceed the SIMD16 limit
draw_bkp
Add semaphore wait before/after draw call count.
INTEL_DEBUG_BKP_BEFORE_DRAW_COUNT
orINTEL_DEBUG_BKP_AFTER_DRAW_COUNT
can control draw call number. To make test wait forever, we need to set preempt_timeout_ms and i915.enable_hangcheck to zero.fall
emit messages about performance issues (same as
perf
)fs
dump shader assembly for fragment shaders
gs
dump shader assembly for geometry shaders
heaps
print information about the driver’s heaps (ANV only)
hex
print instruction hex dump with the disassembly
l3
emit messages about the new L3 state during transitions
mesh
dump shader assembly for mesh shaders
no8
don’t generate SIMD8 fragment shader
no16
suppress generation of 16-wide fragment shaders. useful for debugging broken shaders
no32
suppress generation of 32-wide fragment shaders. useful for debugging broken shaders
no-oaconfig
disable HW performance metric configuration, and anything related to i915-perf (useful when running on simulation)
nocompact
disable instruction compaction
nodualobj
suppress generation of dual-object geometry shader code
nofc
disable fast clears
noccs
disable lossless color compression
optimizer
dump shader assembly to files at each optimization pass and iteration that make progress
pc
emit messages about PIPE_CONTROL instruction usage
perf
emit messages about performance issues
perfmon
emit messages about GL_AMD_performance_monitor
perf-symbol-names
use performance counter symbols instead of the counter name (counter symbols are like variable names, it’s sometimes easier to work with when you have lots of metrics to collect)
reemit
mark all state dirty on each draw call
rt
dump shader assembly for ray tracing shaders
sf
emit messages about the strips & fans unit (for old gens, includes the SF program)
shader-print
allow developer print traces added by brw_nir_printf to be printed out on the console
soft64
enable implementation of software 64bit floating point support
sparse
dump usage of sparse resources
spill_fs
force spilling of all registers in the scalar backend (useful to debug spilling code)
spill_vec4
force spilling of all registers in the vec4 backend (useful to debug spilling code)
stall
inserts a stall on the GPU after each draw/dispatch command to wait for it to finish before starting any new work.
submit
emit batchbuffer usage statistics
sync
after sending each batch, wait on the CPU for that batch to finish rendering
swsb-stall
Insert sync NOP after each instruction. This is only valid for Gfx12+.
task
dump shader assembly for task shaders
tcs
dump shader assembly for tessellation control shaders
tcs8
force usage of 8-patches tessellation control shaders (only for gfx 9-11)
tes
dump shader assembly for tessellation evaluation shaders
tex
emit messages about textures.
urb
emit messages about URB setup
vs
dump shader assembly for vertex shaders
wm
dump shader assembly for fragment shaders (same as
fs
)cl-quiet
quiets the OpenCL warnings recommending use of Intel compute-runtime
- INTEL_DECODE¶
a comma-separated list of enable/disable flags configuring the output produced by
INTEL_DEBUG=bat
(use withINTEL_DECODE=+color,-floats
) :color
print colored output
floats
try to decode floating point data in buffers
full
print additional custom information for instructions (usually pulling more information by inspecting memory)
offsets
print offsets of instructions
- INTEL_EXTENDED_METRICS¶
By default, only a standard set of GPU metrics are advertised. This reduces time to collect metrics and hides infrequently used metrics. To enable all metrics, set value to 1.
- INTEL_FORCE_PROBE¶
A comma-separated list of device probe override values. The basic format is
<pci-id>[,<pci-id>,...]
. The wildcard value of*
will specify all known PCI IDs. If!
precedes a PCI ID, or the wildcard value, then the device support will be disabled. All numbers are interpreted in base 16, and a0x
prefix is optional. Values specified later take precedence, so the wildcard probably should only be used at the beginning.Some examples :
1234,!abcd
Device 0x1234 would be forced on and 0xabcd would be disabled.
1234,!*
All devices are disabled since the wildcard appears later.
!*,0x1234
All devices disabled except 0x1234 which is forced on.
*,!0x1234
All devices are forced on, except 0x1234 which is disabled.
!0x1234,1234
Support for device 0x1234 is forced on since the enable appears later.
NoteIf a device requires using
INTEL_FORCE_PROBE
to force it to load, then Mesa does not have full support for the device. It may have limited, or possibly no functionality within Mesa at this point. It is recommended to upgrade to a Mesa which does not requireINTEL_FORCE_PROBE
for the device as soon as it is available.
- INTEL_MEASURE¶
Collects GPU timestamps over common intervals, and generates a CSV report to show how long rendering took. The overhead of collection is limited to the flushing that is required at the interval boundaries for accurate timestamps. By default, timing data is sent to
stderr
. To direct output to a file:INTEL_MEASURE=file=/tmp/measure.csv {workload}
To begin capturing timestamps at a particular frame:
INTEL_MEASURE=file=/tmp/measure.csv,start=15 {workload}
To capture only 23 frames:
INTEL_MEASURE=count=23 {workload}
To capture frames 15-37, stopping before frame 38:
INTEL_MEASURE=start=15,count=23 {workload}
Designate an asynchronous control file with:
INTEL_MEASURE=control=path/to/control.fifo {workload}
As the workload runs, enable capture for 5 frames with:
$ echo 5 > path/to/control.fifo
Enable unbounded capture:
$ echo -1 > path/to/control.fifo
and disable with:
$ echo 0 > path/to/control.fifo
Select the boundaries of each snapshot with:
INTEL_MEASURE=draw
Collects timings for every render (DEFAULT)
INTEL_MEASURE=rt
Collects timings when the render target changes
INTEL_MEASURE=batch
Collects timings when batches are submitted
INTEL_MEASURE=frame
Collects timings at frame boundaries
With
INTEL_MEASURE=interval=5
, the duration of 5 events will be combined into a single record in the output. When possible, a single start and end event will be submitted to the GPU to minimize stalling. Combined events will not span batches, except in the case ofINTEL_MEASURE=frame
.Collect CPU timestamps instead of GPU timestamps. Prints results immediately instead of waiting for GPU execution. Useful when used with interactive debug to know which frame, or where in frame, you are currently in.
INTEL_MEASURE=cpu {workload}
- INTEL_MODIFIER_OVERRIDE¶
if set, determines the single DRM modifier reported back to (Vulkan) applications, in order to make selecting modifier deterministic between Vulkan driver and applications. The value can be one of the supported modifiers on a platform, but other values are also acceptable for debug purposes.
- INTEL_NO_HW¶
if set to 1, true or yes, prevents batches from being submitted to the hardware. This is useful for debugging hangs, etc.
- INTEL_PRECISE_TRIG¶
if set to 1, true or yes, then the driver prefers accuracy over performance in trig functions.
- INTEL_SHADER_OPTIMIZER_PATH¶
if set, determines the directory to be used for overriding shader assembly. The binaries with custom assembly should be placed in this folder and have a name formatted as
sha1_of_assembly.bin
. The SHA-1 of a shader assembly is printed when assembly is dumped via correspondingINTEL_DEBUG
flag (e.g.vs
for vertex shader). A binary could be generated from a dumped assembly byi965_asm
. ForINTEL_SHADER_ASM_READ_PATH
to work it is necessary to enable dumping of corresponding shader stages viaINTEL_DEBUG
. It is advised to usenocompact
flag ofINTEL_DEBUG
when dumping and overriding shader assemblies. The success of assembly override would be signified by “Successfully overrode shader with sha1 <SHA-1>” in stderr replacing the original assembly.
- INTEL_SHADER_ASM_READ_PATH¶
if set, determines the directory to be used for overriding shader assembly. The binaries with custom assembly should be placed in this folder and have a name formatted as
sha1_of_assembly.bin
. The SHA-1 of a shader assembly is printed when assembly is dumped via correspondingINTEL_DEBUG
flag (e.g.vs
for vertex shader). A binary could be generated from a dumped assembly byi965_asm
. ForINTEL_SHADER_ASM_READ_PATH
to work it is necessary to enable dumping of corresponding shader stages viaINTEL_DEBUG
. It is advised to usenocompact
flag ofINTEL_DEBUG
when dumping and overriding shader assemblies. The success of assembly override would be signified by “Successfully overrode shader with sha1 <SHA-1>” in stderr replacing the original assembly.
- INTEL_SHADER_BIN_DUMP_PATH¶
if set, determines the directory to which the compiled shaders will be dumped. They will be dumped as
sha1_of_assembly.bin
, where the sha1 values will be the same as can be found in theINTEL_DEBUG
output, and can be used forINTEL_SHADER_ASM_READ_PATH
input.NoteUnlike the text form of shader dumping,
INTEL_DEBUG
does not affect on the list of shaders to dump. All generated shaders are always dumped ifINTEL_SHADER_BIN_DUMP_PATH
variable is set.
- INTEL_SIMD_DEBUG¶
a comma-separated list of named flags, which control simd dispatch widths:
fs8
allow generation of SIMD8 fragment shader
fs16
allow generation of SIMD16 fragment shader
fs32
allow generation of SIMD32 fragment shader
cs8
allow generation of SIMD8 compute shader
cs16
allow generation of SIMD16 compute shader
cs32
allow generation of SIMD32 compute shader
ts8
allow generation of SIMD8 task shader
ts16
allow generation of SIMD16 task shader
ts32
allow generation of SIMD32 task shader
ms8
allow generation of SIMD8 mesh shader
ms16
allow generation of SIMD16 mesh shader
ms32
allow generation of SIMD32 mesh shader
rt8
allow generation of SIMD8 ray-tracing shader
rt16
allow generation of SIMD16 ray-tracing shader
rt32
allow generation of SIMD32 ray-tracing shader
If none of widths for particular shader stage was specified, then all widths are allowed.
Anvil(ANV) driver environment variables¶
- ANV_ENABLE_PIPELINE_CACHE¶
If defined to
0
orfalse
, this will disable pipeline caching, forcing ANV to reparse and recompile any VkShaderModule (SPIRV) it is given.
- ANV_DISABLE_SECONDARY_CMD_BUFFER_CALLS¶
If defined to
1
ortrue
, this will prevent usage of self modifying command buffers to implementvkCmdExecuteCommands
. As a result of this, it will also disable VK_KHR_performance_query.
- ANV_ALWAYS_BINDLESS¶
If defined to
1
ortrue
, this forces all descriptor sets to use the internal Binding Model.
- ANV_QUEUE_THREAD_DISABLE¶
If defined to
1
ortrue
, this disables support for timeline semaphores.
- ANV_USERSPACE_RELOCS¶
If defined to
1
ortrue
, this forces ANV to always do kernel relocations in command buffers. This should only have an effect on hardware that doesn’t support soft-pinning (Ivybridge, Haswell, Cherryview).
- ANV_PRIMITIVE_REPLICATION_MAX_VIEWS¶
Specifies up to how many view shaders can be lowered to handle VK_KHR_multiview. Beyond this number, multiview is implemented using instanced rendering. If unspecified, the value default to
2
.
- ANV_NO_GPL¶
If set to 1, true, or yes, then VK_EXT_graphics_pipeline_library will be disabled.
- ANV_SPARSE¶
By default, the sparse resources feature is enabled. However, if set to 0, false, or no, it will be disabled. Platforms older than Tiger Lake do not support this feature.
- ANV_SPARSE_USE_TRTT¶
On platforms supported by Xe KMD (Lunar Lake and newer) this parameter changes the implementation of sparse resources feature. For i915 there is no option, sparse resources is always implemented with TRTT.
DRI environment variables¶
- DRI_NO_MSAA¶
disable MSAA for GLX/EGL MSAA visuals
Vulkan mesa device select layer environment variables¶
- MESA_VK_DEVICE_SELECT¶
when set to “list” prints the list of devices. when set to “vid:did” number from PCI device. That PCI device is selected as default. The default device is returned as the first device in vkEnumeratePhysicalDevices API. Using “vid:did!” will have the same effect as using the
MESA_VK_DEVICE_SELECT_FORCE_DEFAULT_DEVICE
variable.
- MESA_VK_DEVICE_SELECT_FORCE_DEFAULT_DEVICE¶
when set to 1, the device identified as default will be the only one returned in vkEnumeratePhysicalDevices API.
EGL environment variables¶
Mesa EGL supports different sets of environment variables. See the Mesa EGL page for the details.
Gallium environment variables¶
- GALLIUM_HUD¶
draws various information on the screen, like framerate, CPU load, driver statistics, performance counters, etc. Set
GALLIUM_HUD
tohelp
and run e.g.glxgears
for more info.
- GALLIUM_HUD_PERIOD¶
sets the HUD update rate in seconds (float). Use zero to update every frame. The default period is 1/2 second.
- GALLIUM_HUD_VISIBLE¶
control default visibility, defaults to true.
- GALLIUM_HUD_OPACITY¶
control background opacity as an integer percentage (1-100), defaults to 66%.
- GALLIUM_HUD_TOGGLE_SIGNAL¶
toggle visibility via user specified signal. Especially useful to toggle HUD at specific points of application and disable for unencumbered viewing the rest of the time. For example, set
GALLIUM_HUD_VISIBLE
tofalse
andGALLIUM_HUD_TOGGLE_SIGNAL
to10
(SIGUSR1
). Usekill -10 <pid>
to toggle the HUD as desired.
- GALLIUM_HUD_SCALE¶
Scale HUD by an integer factor, for high DPI displays. Default is 1.
- GALLIUM_HUD_ROTATION¶
Rotate the HUD by an integer number of degrees, the specified value must be a multiple of 90. Default is 0.
- GALLIUM_HUD_DUMP_DIR¶
specifies a directory for writing the displayed HUD values into files.
- GALLIUM_DRIVER¶
useful in combination with
LIBGL_ALWAYS_SOFTWARE
=true
for choosing one of the software rendererssoftpipe
orllvmpipe
.
- GALLIUM_LOG_FILE¶
specifies a file for logging all errors, warnings, etc. rather than stderr.
- GALLIUM_PIPE_SEARCH_DIR¶
specifies an alternate search directory for pipe-loader which overrides the compile-time path based on the install location.
- GALLIUM_PRINT_OPTIONS¶
if non-zero, print all the Gallium environment variables which are used, and their current values.
- GALLIUM_TRACE¶
If set, this variable will cause the Trace output to be written to the specified file. Paths may be relative or absolute; relative paths are relative to the working directory. For example, setting it to “trace.xml” will cause the trace to be written to a file of the same name in the working directory.
- GALLIUM_TRACE_TC¶
If enabled while Trace is active, this variable specifies that the threaded context should be traced for drivers which implement it. By default, the driver thread is traced, which will include any reordering of the command stream from threaded context.
- GALLIUM_TRACE_TRIGGER¶
If set while Trace is active, this variable specifies a filename to monitor. Once the file exists (e.g., from the user running ‘touch /path/to/file’), a single frame will be recorded into the trace output. Paths may be relative or absolute; relative paths are relative to the working directory.
- GALLIUM_DUMP_CPU¶
if non-zero, print information about the CPU on start-up
- TGSI_PRINT_SANITY¶
if set, do extra sanity checking on TGSI shaders and print any errors to stderr.
- DRAW_FSE¶
Enable fetch-shade-emit middle-end even though its not correct (e.g. for Softpipe)
- DRAW_NO_FSE¶
Disable fetch-shade-emit middle-end even when it is correct
- DRAW_USE_LLVM¶
if set to zero, the draw module will not use LLVM to execute shaders, vertex fetch, etc.
- ST_DEBUG¶
controls debug output from the Mesa/Gallium state tracker. Setting to
tgsi
, for example, will print all the TGSI shaders. Seesrc/mesa/state_tracker/st_debug.c
for other options.
- GALLIUM_OVERRIDE_CPU_CAPS¶
Override CPU capabilities for LLVMpipe and Softpipe, possible values for x86:
nosse
sse
sse2
sse3
ssse3
sse4.1
avx
Clover environment variables¶
- CLOVER_DEVICE_TYPE¶
allows to overwrite the device type of devices. Possible values are
accelerator
,cpu
,custom
andgpu
- CLOVER_DEVICE_VERSION_OVERRIDE¶
overwrites the auto detected OpenCL version of a device. Possible values:
1.0
1.1
1.2
2.0
2.1
2.2
3.0
- CLOVER_DEVICE_CLC_VERSION_OVERRIDE¶
overwrites the auto detected CLC version. Possible values:
1.0
1.1
1.2
2.0
2.1
2.2
3.0
- CLOVER_EXTRA_BUILD_OPTIONS¶
allows specifying additional compiler and linker options. Specified options are appended after the options set by the OpenCL program in
clBuildProgram
.
- CLOVER_EXTRA_COMPILE_OPTIONS¶
allows specifying additional compiler options. Specified options are appended after the options set by the OpenCL program in
clCompileProgram
.
- CLOVER_EXTRA_LINK_OPTIONS¶
allows specifying additional linker options. Specified options are appended after the options set by the OpenCL program in
clLinkProgram
.
- IRIS_ENABLE_CLOVER¶
allows to enable experimental Clover NIR support with the iris driver if set to 1 or true.
Rusticl environment variables¶
- RUSTICL_DEVICE_TYPE¶
allows to overwrite the device type of devices. Possible values are
accelerator
,cpu
,custom
andgpu
- RUSTICL_CL_VERSION¶
overwrites the auto detected OpenCL version of all devices. Specified as
major.minor
.
- RUSTICL_ENABLE¶
a comma-separated list of drivers to enable CL on. An optional list of comma-separated integers can be passed per driver to specify which devices to enable. Examples:
RUSTICL_ENABLE=iris
(enables all iris devices)RUSTICL_ENABLE=iris:1,radeonsi:0,2
(enables second iris and first and third radeonsi device)
Supported drivers (decent support with maybe a few conformance issues or bugs):
iris
,llvmpipe
,nouveau
,panfrost
,radeonsi
, Experimental drivers (unknown level of support, expect conformance issues or major bugs):r600
- RUSTICL_FEATURES¶
a comma-separated list of features to enable. Those are disabled by default as they might not be stable enough or break OpenCL conformance.
fp16
enables OpenCL half supportfp64
enables OpenCL double support
- RUSTICL_DEBUG¶
a comma-separated list of debug channels to enable.
allow_invalid_spirv
disables validation of any input SPIR-Vclc
dumps all OpenCL C source being compilednir
dumps nirs in various compilation stages. Might print nothing if shader caching isenabled.
no_reuse_context
pipe_contexts are not recycledno_variants
disable kernel variants (e.g. specialized binaries for offsets == 0)perf
prints a warning when hitting slow paths onceperfspam
same as perf, but doesn’t skip same warningsprogram
dumps compilation logs to stderrsync
waits on the GPU to complete after every eventvalidate
validates any internally generated SPIR-Vs, e.g. through compiling OpenCL C code
- RUSTICL_MAX_WORK_GROUPS¶
Limits the amount of threads per dimension in a work-group. Useful for splitting up long running tasks to increase responsiveness or to simulate the lowering of huge global sizes for testing.
clc environment variables¶
- CLC_DEBUG¶
a comma-separated list of debug channels to enable.
dump_llvm
Dumps all generated LLVM IRsdump_spirv
Dumps all compiled, linked and specialized SPIR-Vsverbose
Enable debug logging of clc code
Nine frontend environment variables¶
- D3D_ALWAYS_SOFTWARE¶
an integer, which forces Nine to use the CPU instead of GPU acceleration.
- NINE_DEBUG¶
a comma-separated list of named flags that do debugging things. Use
NINE_DEBUG=help
to print a list of available options.
- NINE_FF_DUMP¶
a boolean, which dumps shaders generated by a fixed function (FF).
- NINE_SHADER¶
a comma-separated list of named flags, which do alternate shader handling. Use
NINE_SHADER=help
to print a list of available options.
- NINE_QUIRKS¶
a comma-separated list of named flags that do various things. Use
NINE_DEBUG=help
to print a list of available options.
Softpipe driver environment variables¶
- SOFTPIPE_DEBUG¶
a comma-separated list of named flags, which do various things:
vs
Dump vertex shader assembly to stderr
fs
Dump fragment shader assembly to stderr
gs
Dump geometry shader assembly to stderr
cs
Dump compute shader assembly to stderr
no_rast
rasterization is disabled. For profiling purposes.
use_llvm
the Softpipe driver will try to use LLVM JIT for vertex shading processing.
LLVMpipe driver environment variables¶
- LP_NO_RAST¶
if set LLVMpipe will no-op rasterization
- LP_DEBUG¶
a comma-separated list of debug options is accepted. See the source code for details.
- LP_PERF¶
a comma-separated list of options to selectively no-op various parts of the driver. See the source code for details.
- LP_NUM_THREADS¶
an integer indicating how many threads to use for rendering. Zero turns off threading completely. The default value is the number of CPU cores present.
VMware SVGA driver environment variables¶
- SVGA_FORCE_SWTNL¶
force use of software vertex transformation
- SVGA_NO_SWTNL¶
don’t allow software vertex transformation fallbacks (will often result in incorrect rendering).
- SVGA_DEBUG¶
for dumping shaders, constant buffers, etc. See the code for details.
- SVGA_EXTRA_LOGGING¶
if set, enables extra logging to the
vmware.log
file, such as the OpenGL program’s name and command line arguments.
- SVGA_NO_LOGGING¶
if set, disables logging to the
vmware.log
file. This is useful when using Valgrind because it otherwise crashes when initializing the host log feature.
See the driver code for other, lesser-used variables.
WGL environment variables¶
- WGL_SWAP_INTERVAL¶
to set a swap interval, equivalent to calling
wglSwapIntervalEXT()
in an application. If this environment variable is set, application calls towglSwapIntervalEXT()
will have no effect.
VA-API environment variables¶
- VAAPI_MPEG4_ENABLED¶
enable MPEG4 for VA-API, disabled by default.
VC4 driver environment variables¶
- VC4_DEBUG¶
a comma-separated list of named flags, which do various things. Use
VC4_DEBUG=help
to print a list of available options.
V3D/V3DV driver environment variables¶
- V3D_DEBUG¶
a comma-separated list of debug options. Use
V3D_DEBUG=help
to print a list of available options.
RADV driver environment variables¶
- RADV_DEBUG¶
a comma-separated list of named flags, which do various things:
llvm
enable LLVM compiler backend
allbos
force all allocated buffers to be referenced in submissions
checkir
validate the LLVM IR before LLVM compiles the shader
epilogs
dump fragment shader epilogs
extra_md
add extra information in bo metadata to help tools (umr)
forcecompress
Enables DCC,FMASK,CMASK,HTILE in situations where the driver supports it but normally does not deem it beneficial.
hang
enable GPU hangs detection and dump a report to $HOME/radv_dumps_<pid>_<time> if a GPU hang is detected
img
Print image info
info
show GPU-related information
invariantgeom
Mark geometry-affecting outputs as invariant. This works around a common class of application bugs appearing as flickering.
metashaders
dump internal meta shaders
noatocdithering
disable dithering for alpha to coverage
nobinning
disable primitive binning
nocache
disable shaders cache
nocompute
disable compute queue
nodcc
disable Delta Color Compression (DCC) on images
nodisplaydcc
disable Delta Color Compression (DCC) on displayable images
nodynamicbounds
do not check OOB access for dynamic descriptors
noeso
disable VK_EXT_shader_object
nofastclears
disable fast color/depthstencil clears
nofmask
disable FMASK compression on MSAA images (GFX6-GFX10.3)
nogpl
disable VK_EXT_graphics_pipeline_library
nohiz
disable HIZ for depthstencil images
noibs
disable directly recording command buffers in GPU-visible memory
nomeshshader
disable mesh shader support on GFX10.3+
nongg
disable NGG for GFX10 and GFX10.3
nonggc
disable NGG culling on GPUs where it’s enabled by default (GFX10.3 only).
nongg_gs
disable NGG GS for GFX10 and GFX10.3
nort
skip executing vkCmdTraceRays and ray queries (RT extensions will still be advertised)
notccompatcmask
disable TC-compat CMASK for MSAA surfaces
noumr
disable UMR dumps during GPU hang detection (only with
RADV_DEBUG
=hang
)novrsflatshading
disable VRS for flat shading (only on GFX10.3+)
preoptir
dump LLVM IR before any optimizations
prologs
dump vertex shader prologs
shaders
dump shaders
shaderstats
dump shader statistics
shadowregs
enable register shadowing
spirv
dump SPIR-V
splitfma
split application-provided fused multiply-add in geometry stages
startup
display info at startup
syncshaders
synchronize shaders after all draws/dispatches
zerovram
initialize all memory allocated in VRAM as zero
- RADV_FORCE_FAMILY¶
create a null device to compile shaders without a AMD GPU (e.g. VEGA10)
- RADV_FORCE_VRS¶
allow to force per-pipeline vertex VRS rates on GFX10.3+. This is only forced for pipelines that don’t explicitly use VRS or flat shading. The supported values are 2x2, 1x2, 2x1 and 1x1. Only for testing purposes.
- RADV_FORCE_VRS_CONFIG_FILE¶
similar to
RADV_FORCE_VRS
but allow to configure from a file. If present, this supersedesRADV_FORCE_VRS
.
- RADV_PERFTEST¶
a comma-separated list of named flags, which do various things:
bolist
enable the global BO list
cswave32
enable wave32 for compute shaders (GFX10+)
dccmsaa
enable DCC for MSAA images
dmashaders
upload shaders to invisible VRAM (might be useful for non-resizable BAR systems)
emulate_rt
forces ray-tracing to be emulated in software on GFX10_3+ and enables rt extensions with older hardware.
gewave32
enable wave32 for vertex/tess/geometry shaders (GFX10+)
localbos
enable local BOs
nggc
enable NGG culling on GPUs where it’s not enabled by default (GFX10.1 only).
nircache
cache per-stage NIR for graphics pipelines
nosam
disable optimizations that get enabled when all VRAM is CPU visible.
pswave32
enable wave32 for pixel shaders (GFX10+)
rtwave32
enable wave32 for ray tracing shaders (GFX11+)
rtwave64
enable wave64 for ray tracing shaders (GFX10-10.3)
sam
enable optimizations to move more driver internal objects to VRAM.
transfer_queue
enable experimental transfer queue support (GFX9+, not yet spec compliant)
video_decode
enable experimental video decoding support
- RADV_TEX_ANISO¶
force anisotropy filter (up to 16)
- RADV_THREAD_TRACE_BUFFER_SIZE¶
set the SQTT/RGP buffer size in bytes (default value is 32MiB, the buffer is automatically resized if too small)
- RADV_THREAD_TRACE_CACHE_COUNTERS¶
enable/disable SQTT/RGP cache counters on GFX10+ (enabled by default)
- RADV_THREAD_TRACE_INSTRUCTION_TIMING¶
enable/disable SQTT/RGP instruction timing (enabled by default)
- RADV_THREAD_TRACE_QUEUE_EVENTS¶
enable/disable SQTT/RGP queue events (enabled by default)
- RADV_RRA_TRACE_VALIDATE¶
enable validation of captured acceleration structures. Can be useful if RRA crashes upon opening a trace.
- RADV_RRA_TRACE_HISTORY_SIZE¶
set the ray history buffer size when capturing RRA traces (default value is 100MiB, small buffers may result in incomplete traces)
- RADV_RRA_TRACE_RESOLUTION_SCALE¶
decrease the resolution used for dumping the ray history resolution when capturing RRA traces. This allows for dumping every Nth invocation along each dispatch dimension.
- RADV_PROFILE_PSTATE¶
choose the specific pstate to enter when using thread tracing or when acquiring the profiling lock for performance queries.
standard
force GPU clocks to an arbitrary fixed level
min_sclk
force the shader clock to its minimum level
min_mclk
force the memory clock to its minimum level
peak
force GPU clocks to their maximum level, this is the default value
- ACO_DEBUG¶
a comma-separated list of named flags, which do various things:
validateir
validate the ACO IR at various points of compilation (enabled by default for debug/debugoptimized builds)
novalidateir
disable ACO IR validation in debug/debugoptimized builds
validatera
validate register assignment of ACO IR and catches many RA bugs
force-waitcnt
force emitting waitcnt states if there is something to wait for
force-waitdeps
force emitting waitcnt dependencies for debugging hazards on GFX10+
novn
disable value numbering
noopt
disable various optimizations
nosched
disable pre-RA, ILP and VOPD instruction scheduling
nosched-ilp
disable ILP instruction scheduling
nosched-vopd
disable VOPD instruction scheduling
perfinfo
print information used to calculate some pipeline statistics
liveinfo
print liveness and register demand information before scheduling
RadeonSI driver environment variables¶
- radeonsi_no_infinite_interp¶
Kill PS with infinite interp coeff (might fix hangs)
- radeonsi_clamp_div_by_zero¶
Clamp div by zero (x / 0 becomes FLT_MAX instead of NaN) (might fix rendering corruptions)
- radeonsi_zerovram¶
Clear all allocated memory to 0 before usage (might fix rendering corruptions)
- AMD_DEBUG¶
a comma-separated list of named flags, which do various things:
nodcc
Disable DCC.
nodccclear
Disable DCC fast clear
nodisplaydcc
disable Delta Color Compression (DCC) on displayable images
nodccmsaa
Disable DCC for MSAA
nodpbb
Disable DPBB. Overrules the dpbb enable option.
noefc
Disable hardware based encoder color format conversion
lowlatencyenc
Enable low latency encoding
notiling
Disable tiling
nofmask
Disable MSAA compression
nohyperz
Disable Hyper-Z
no2d
Disable 2D tiling
info
Print driver information
tex
Print texture info
compute
Print compute info
vm
Print virtual addresses when creating resources
vs
Print vertex shaders
ps
Print pixel shaders
gs
Print geometry shaders
tcs
Print tessellation control shaders
tes
Print tessellation evaluation shaders
cs
Print compute shaders
noir
Don’t print the LLVM IR
nonir
Don’t print NIR when printing shaders
noasm
Don’t print disassembled shaders
preoptir
Print the LLVM IR before initial optimizations
w32ge
Use Wave32 for vertex, tessellation, and geometry shaders.
w32ps
Use Wave32 for pixel shaders.
w32cs
Use Wave32 for computes shaders.
w64ge
Use Wave64 for vertex, tessellation, and geometry shaders.
w64ps
Use Wave64 for pixel shaders.
w64cs
Use Wave64 for computes shaders.
checkir
Enable additional sanity checks on shader IR
mono
Use old-style monolithic shaders compiled on demand
nooptvariant
Disable compiling optimized shader variants.
useaco
Use ACO as shader compiler when possible
nowc
Disable GTT write combining
check_vm
Check VM faults and dump debug info.
reserve_vmid
Force VMID reservation per context.
nongg
Disable NGG and use the legacy pipeline.
nggc
Always use NGG culling even when it can hurt.
nonggc
Disable NGG culling.
switch_on_eop
Program WD/IA to switch on end-of-packet.
nooutoforder
Disable out-of-order rasterization
dpbb
Enable DPBB. Enable DPBB for gfx9 dGPU. Default enabled for gfx9 APU and >= gfx10.
extra_md
add extra information in bo metadata to help tools (umr)
r600 driver environment variables¶
- R600_DEBUG¶
a comma-separated list of named flags, which do various things:
nocpdma
Disable CP DMA
nosb
Disable sb backend for graphics shaders
sbcl
Enable sb backend for compute shaders
sbdry
Don’t use optimized bytecode (just print the dumps)
sbstat
Print optimization statistics for shaders
sbdump
Print IR dumps after some optimization passes
sbnofallback
Abort on errors instead of fallback
sbdisasm
Use sb disassembler for shader dumps
sbsafemath
Disable unsafe math optimizations
nirsb
Enable NIR with SB optimizer
tex
Print texture info
nir
Enable experimental NIR shaders
compute
Print compute info
vm
Print virtual addresses when creating resources
info
Print driver information
fs
Print fetch shaders
vs
Print vertex shaders
gs
Print geometry shaders
ps
Print pixel shaders
cs
Print compute shaders
tcs
Print tessellation control shaders
tes
Print tessellation evaluation shaders
noir
Don’t print the LLVM IR
notgsi
Don’t print the TGSI
noasm
Don’t print disassembled shaders
preoptir
Print the LLVM IR before initial optimizations
checkir
Enable additional sanity checks on shader IR
nooptvariant
Disable compiling optimized shader variants.
testdma
Invoke SDMA tests and exit.
testvmfaultcp
Invoke a CP VM fault test and exit.
testvmfaultsdma
Invoke a SDMA VM fault test and exit.
testvmfaultshader
Invoke a shader VM fault test and exit.
nodma
Disable asynchronous DMA
nohyperz
Disable Hyper-Z
noinvalrange
Disable handling of INVALIDATE_RANGE map flags
no2d
Disable 2D tiling
notiling
Disable tiling
switch_on_eop
Program WD/IA to switch on end-of-packet.
forcedma
Use asynchronous DMA for all operations when possible.
precompile
Compile one shader variant at shader creation.
nowc
Disable GTT write combining
check_vm
Check VM faults and dump debug info.
unsafemath
Enable unsafe math shader optimizations
- R600_DEBUG_COMPUTE¶
if set to
true
, various compute-related debug information will be printed to stderr. Defaults tofalse
.
- R600_DUMP_SHADERS¶
if set to
true
, NIR shaders will be printed to stderr. Defaults tofalse
.
- R600_HYPERZ¶
If set to
false
, disables HyperZ optimizations. Defaults totrue
.
- R600_NIR_DEBUG¶
a comma-separated list of named flags, which do various things:
instr
Log all consumed nir instructions
ir
Log created R600 IR
cc
Log R600 IR to assembly code creation
noerr
Don’t log shader conversion errors
si
Log shader info (non-zero values)
reg
Log register allocation and lookup
io
Log shader in and output
ass
Log IR to assembly conversion
flow
Log control flow instructions
merge
Log register merge operations
nomerge
Skip register merge step
tex
Log texture ops
trans
Log generic translation messages
r300 driver environment variables¶
- RADEON_DEBUG¶
a comma-separated list of named flags, which do various things:
info
Print hardware info (printed by default on debug builds
fp
Log fragment program compilation
vp
Log vertex program compilation
draw
Log draw calls
swtcl
Log SWTCL-specific info
rsblock
Log rasterizer registers
psc
Log vertex stream registers
tex
Log basic info about textures
texalloc
Log texture mipmap tree info
rs
Log rasterizer
fb
Log framebuffer
cbzb
Log fast color clear info
hyperz
Log HyperZ info
scissor
Log scissor info
msaa
Log MSAA resources
anisohq
Use high quality anisotropic filtering
notiling
Disable tiling
noimmd
Disable immediate mode
noopt
Disable shader optimizations
nocbzb
Disable fast color clear
nozmask
Disable zbuffer compression
nohiz
Disable hierarchical zbuffer
nocmask
Disable AA compression and fast AA clear
notcl
Disable hardware accelerated Transform/Clip/Lighting
Asahi driver environment variables¶
- ASAHI_MESA_DEBUG¶
a comma-separated list of named flags, which do various things:
trace
Trace work submitted to the GPU to files, using the agxdecode infrastructure. This produces a large volume of data, so should be used with caution. The traces are written to
agxdecode.dump
, but this can be overridden usingAGXDECODE_DUMP_FILE
.no16
Disable 16-bit floating point support. This may workaround application bugs in certain OpenGL ES applications originally written for desktops. If such applications are found in the wild, they should be fixed upstream (if possible) or added in the Mesa-wide driconf (if closed source).
dirty
In debug builds only: disable dirty tracking optimizations.
nowc
Disable write-combining (force all allocations to be write-through). This may be useful for diagnosing certain performance issues. Note imported buffers may still be write-combined.
- AGX_MESA_DEBUG¶
a comma-separated list of named flags, which do various things:
shaders
Print shaders being compiled at various stages in the pipeline.
shaderdb
Print statistics about compiled shaders.
verbose
Disassemble in verbose mode, including additional information that may be useful for debugging.
internal
Include even internal shaders (as produced for clears, blits, and such) when printing shaders. Without this flag, internal shaders are ignored by the shaders and shaderdb flags.
novalidate
In debug builds only: skip internal intermediate representation validation.
noopt
Disable various backend optimizations.
PowerVR driver environment variables¶
- PVR_DEBUG¶
A comma-separated list of debug options. Use
PVR_DEBUG=help
to print a list of available options.
- ROGUE_DEBUG¶
a comma-separated list of named flags for the Rogue compiler, which do various things:
nir
Print the input NIR to stdout.
nir_passes
Print the output of each NIR pass to stdout.
ir
Print the input Rogue IR to stdout.
ir_passes
Print the output of each Rogue IR pass to stdout.
ir_details
Includes additional details when printing Rogue IR.
vld_skip
Skips the compiler validation step.
vld_nonfatal
Prints all the validation errors instead of stopping after the first.
- ROGUE_COLOR¶
if set to
auto
Rogue IR will be colorized if stdout is not a pipe. Color is forced off if set tooff
/0
or on if set toon
/1
. Defaults toauto
.
i915 driver environment variables¶
- I915_DEBUG¶
Debug flags for the i915 driver.
- I915_NO_HW¶
Stop the i915 driver from submitting commands to the hardware.
- I915_DUMP_CMD¶
Dump all commands going to the hardware.
Freedreno driver environment variables¶
- FD_MESA_DEBUG¶
Debug flags for the Freedreno driver.
Other Gallium drivers have their own environment variables. These may change frequently so the source code should be consulted for details.
Vulkan loader environment variables¶
These variable are handled by Khronos’ Vulkan loader, not by Mesa, but they are documented here as we reference them in other places in our docs.
- VK_DRIVER_FILES¶
Force the loader to use the specific driver JSON files. The value contains a list of delimited full path listings to driver JSON Manifest files and/or paths to folders containing driver JSON files.
- VK_LOADER_LAYERS_ENABLE¶
A comma-delimited list of globs to search for in known layers and used to select only the layers whose layer name matches one or more of the provided globs. Known layers are those which are found by the loader taking into account default search paths and other environment variables (like VK_LAYER_PATH).
- VK_ICD_FILENAMES¶
Deprecated, replaced by
VK_DRIVER_FILES
.
- VK_INSTANCE_LAYERS¶
Deprecated, replaced by
VK_LOADER_LAYERS_ENABLE
.