Nanley Chery 5197809302 iris: Update the initial CCS state on XeHP
We can't map the CCS on this platform to initialize it into the
PASS_THROUGH state. This can cause issues with optimizations in the
driver that rely on this state.

For example, after rendering to a surface with AUX_NONE, we can then
render to it with AUX_CCS_E without an ambiguate in between (if the CCS
in the PASS_THROUGH state). If that state was incorrect and the aux was
actually compressed, there can be rendering corruption because the
contents may be misinterpreted on the second render.

Use a more accurate initial aux state to avoid these issues.

One notable change in behavior here is that aux surfaces can be created
with fast-cleared blocks even though the caller may specify a modifier
that doesn't support fast clears. This should be fine, so long as all HW
units that can access these surfaces can handle that bit-pattern. We
haven't seen an applicable restriction yet.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13555>
2021-12-11 04:14:20 +00:00
2021-11-03 20:48:43 +00:00
2021-10-13 20:52:19 +01:00

`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.
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