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docs: add INTEL_SHADER_ASM_READ_PATH description

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It was implemented in
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/955

Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6895>
This commit is contained in:
Danylo Piliaiev
2020-09-28 19:29:42 +03:00
committed by Marge Bot
parent 1a19fae868
commit 2c08404f38
1 changed files with 14 additions and 0 deletions
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14
docs/envvars.rst
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@@ -331,6 +331,20 @@ i945/i965 driver environment variables (non-Gallium)
``INTEL_PRECISE_TRIG`` ``INTEL_PRECISE_TRIG``
if set to 1, true or yes, then the driver prefers accuracy over if set to 1, true or yes, then the driver prefers accuracy over
performance in trig functions. performance in trig functions.
``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 sha1 of a shader assembly is printed when assembly is dumped via
corresponding ``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 enable
dumping of corresponding shader stages via ``INTEL_DEBUG``.
It is advised to use ``nocompact`` flag of ``INTEL_DEBUG`` when
dumping and overriding shader assemblies.
The success of assembly override would be signified by "Successfully
overrode shader with sha1 <sha1>" in stderr replacing the original
assembly.
Radeon driver environment variables (radeon, r200, and r300g) Radeon driver environment variables (radeon, r200, and r300g)
------------------------------------------------------------- -------------------------------------------------------------