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Joan Bruguera df8d107ab0 nv50/ir/nir: ignore sampler for TXF/TXQ ops. 
Recently, a regression was reported where videos in Firefox had shifted/
glitched colors on certain Kepler hardware. This was bisected to
bf02bffe15, however, the issue already
existed but didn't hit users until TGSI was switched to NIR as default.

The issue was traced to a YUV-to-RGB fragment shader used by Firefox,
which uses three samplers for the Y/U/V components. The Y component was
handled correctly, but the U/V components were bogus, causing the issue.

After analysis, it appears the TXF/TXQ ops. should only handle the texture
(r) but not the sampler (s), see 63b850403c
and 346ce0b988.
Similarly, handleTXQ/handleTXF on nv50_ir_from_tgsi always sets s=0.
Only Kepler was affected because other hardware ignores s at codegen.

Always set s=0 on NIR for TXF/TXQ, to keep TGSI behavior and fix the
regression.

Thanks: Karol Herbst and M Henning for help diagnosing the issue.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/7416
Cc: mesa-stable
Suggested-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: M Henning <drawoc@darkrefraction.com>
Signed-off-by: Joan Bruguera <joanbrugueram@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19453>
(cherry picked from commit 6014a642ae)
2022-11-02 12:56:01 -07:00
.github/workflows ci: Building osmesa on OSX 2022-07-29 12:57:26 +00:00
.gitlab/issue_templates gitlab: ask that reporters don't include long logs in descriptions 2022-06-08 15:06:51 +00:00
.gitlab-ci meson,amd: Remove Windows libelf wrap 2022-09-25 03:13:14 +08:00
android Android.mk: Intermediate output paths may already be absolute 2022-06-26 22:06:36 +00:00
bin bin/gen_release_notes.py: bump advertised vulkan version to 1.3 2022-08-04 11:33:21 -07:00
build-support configure: commit test files 2017-10-16 16:32:43 -07:00
docs docs: Add sha256 sum for 22.2.2 2022-10-19 10:06:27 -07:00
include intel/pci_ids: Drop non-upstream dg2 pci-ids 2022-09-15 09:25:38 -07:00
src nv50/ir/nir: ignore sampler for TXF/TXQ ops. 2022-11-02 12:56:01 -07:00
subprojects meson,amd: Remove Windows libelf wrap 2022-09-25 03:13:14 +08:00
.dir-locals.el dir-locals.el: Adds White Space support 2016-11-14 19:17:49 +02:00
.editorconfig ci/vs2019: Update editorconfig for ps1 files 2022-06-14 21:14:33 +00:00
.gitattributes Add new rules to .gitattributes 2022-01-19 15:17:17 +00:00
.gitignore .gitignore: Qualify the path for the ignored build directory. 2022-06-09 22:53:37 +00:00
.gitlab-ci.yml ci/docs: Stick to specific version of python packages 2022-09-27 10:03:32 -07:00
.mailmap mailmap: fix order of emails for Axel Davy 2022-07-27 21:36:23 +00:00
.pick_status.json nv50/ir/nir: ignore sampler for TXF/TXQ ops. 2022-11-02 12:56:01 -07:00
CODEOWNERS CODEOWNERS: evelikov renamed to xexaxo 2022-06-24 12:28:59 +00:00
meson.build meson: with_glx never assigned to 'gallium-xlib', so need add with_glx == 'xlib' for dep_glproto 2022-10-25 09:25:41 -07:00
meson_options.txt util: Add a Win32 futex impl 2022-07-15 21:31:51 +00:00
README.rst docs: promote #dri-devel on oftc over freenode 2021-05-24 09:21:48 +00:00
VERSION VERSION: update to 22.2.2 2022-10-19 09:50:22 -07:00

README.rst 

`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================


Source
------

This repository lives at https://gitlab.freedesktop.org/mesa/mesa.
Other repositories are likely forks, and code found there is not supported.


Build & install
---------------

You can find more information in our documentation (`docs/install.rst
<https://mesa3d.org/install.html>`_), but the recommended way is to use
Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_):

.. code-block:: sh

  $ mkdir build
  $ cd build
  $ meson ..
  $ sudo ninja install


Support
-------

Many Mesa devs hang on IRC; if you're not sure which channel is
appropriate, you should ask your question on `OFTC's #dri-devel
<irc://irc.oftc.net/dri-devel>`_, someone will redirect you if
necessary.
Remember that not everyone is in the same timezone as you, so it might
take a while before someone qualified sees your question.
To figure out who you're talking to, or which nick to ping for your
question, check out `Who's Who on IRC
<https://dri.freedesktop.org/wiki/WhosWho/>`_.

The next best option is to ask your question in an email to the
mailing lists: `mesa-dev\@lists.freedesktop.org
<https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_


Bug reports
-----------

If you think something isn't working properly, please file a bug report
(`docs/bugs.rst <https://mesa3d.org/bugs.html>`_).


Contributing
------------

Contributions are welcome, and step-by-step instructions can be found in our
documentation (`docs/submittingpatches.rst
<https://mesa3d.org/submittingpatches.html>`_).

Note that Mesa uses gitlab for patches submission, review and discussions.