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5ed23c14da
This state is helpful to track when resolves are needed for HiZ-CCS
non-WT surfaces, since the ISL_AUX_STATE_COMPRESSED_* states that
currently exist don't distinguish between the CCS and the HiZ surfaces
being in a non-passthrough compression state, so we would have had to
pre-emptively issue a resolve before sampling from any
ISL_AUX_STATE_COMPRESSED_* HiZ-CCS surface just in case its HiZ
surface has non-trivial contents, even if its HiZ surface is in
pass-through state and the surface only has non-trivial CCS
compression.
This commit introduces a new ISL_AUX_STATE_COMPRESSED_HIER_DEPTH state
that indicates that the hierarchical depth surface has non-trivial
contents that have to be considered to get a complete representation
of the image. While in this state the surface may also have
fast-cleared blocks. The pre-existing ISL_AUX_STATE_COMPRESSED_*
states now unambiguously indicate that the HiZ surface is in an
identity state, so it's unnecessary to obtain a complete
representation of the image e.g. while sampling from a HiZ-CCS depth
surface.
v2: Use more abstract aux state name instead of
ISL_AUX_STATE_COMPRESSED_HIZ, don't transition legacy HIZ surfaces
to new aux state on write by using COMPRESS write behavior instead
of COMPRESS_HIZ (Nanley).
v3: Comment clarifications (Nanley).
v4: Re-apply change to transition legacy HIZ surfaces to new aux state
on write by using COMPRESS_HIZ for consistent semantics of the aux
state irrespective of the aux usage, this is particularly
important because the HIZ aux usage coexists with HIZ_CCS in some
platforms, so pretending write_behavior is just "COMPRESS" for HIZ
as on v2 would cause the ISL_AUX_STATE_COMPRESSED_CLEAR state to
have different meaning and require different handling depending on
the aux usage that was used with the surface before.
v5: Additional comment clarifications, express aux_state_possible()
result and isl_aux_prepare_access() check in terms of
aux_usage_info::write_behavior (Nanley). Move changes in behavior
for ISL_AUX_STATE_CLEAR from future ISL partial resolve commit
into this commit since the change is already required for
correctness as part of the split of hierarchical depth states.
Acked-by: Nanley Chery <nanley.g.chery@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31139>
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| VERSION | ||
`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://docs.mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://docs.mesa3d.org/meson.html>`_): .. code-block:: sh $ meson setup build $ ninja -C build/ $ sudo ninja -C build/ 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://docs.mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://docs.mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.