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When choosing between the suggested tilings, create one of each allowed
and pick the smallest one. One benefit of using the standard tilings is
that miptails can avoid space waste in mipmapped compressed textures.
From the ICL PRM, Volume 5: Memory Data Formats, "MIP Layout":
If Tiling is enabled, then each MIP is layed out using one or more
tiles. If TileYf or TileYs tiling is enabled (TR_MODE != NONE), then
some of the MIPs may actually be stored in a MIPTail which fits in a
single 64K or 4K tile. The layout above, then only applied to MIPs
which are not packed in the MIP Tail. Note that, depending on surface
height the Vertical Alignment that surface can actually have the last
few mips layed out below LOD1. Using MIP Tail (if supported)
eliminates this possibility.
In the performance CI, this helps:
* Hogwarts Legacy on DG2 by 0.64%
* Satisfactory on BMG by 0.89%
* Wukong on BMG by 0.77%
Highlights on memory saved by using Tile64 from at most 10k frames in
game traces on DG2:
* Hogwarts. 32 instances of:
Saved 128 4KB page(s). extent=4096x4096x1 dim=2d levels=13 fmt=BC7_UNORM
* Assassin's Creed. 8 instances of:
Saved 768 4KB page(s). extent=120x68x192 dim=3d levels=1 fmt=R16G16B16A16_FLOAT
* Black Ops 3. 3 instances of:
Saved 864 4KB page(s). extent=172x140x288 dim=3d levels=1 fmt=BC6H_UF16
* God of War. 1 instance of:
Saved 1920 4KB page(s). extent=320x170x192 dim=3d levels=1 fmt=R16G16B16A16_FLOAT
This patch may cause regressions on SKL-TGL because the smaller surface
may not support compression. This will be fixed in a coming patch.
v2. Don't factor in the image alignments when comparing their sizes.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/14074
Reviewed-by: Rohan Garg <rohan.garg@intel.com> (v1)
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38063>
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`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.