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This is needed for VK_EXT_host_image_copy. Most other mesa drivers use a similar approach to implement tiled->tiled copy, with a few differences. They use a temp buffer sized for only one tile, don't attempt to tile-align the copies in either the src or dest, and they don't have the memcpy fast path. I measured performance of a variety of implementations on a rock5b, and found: - The fast path for when the copy region is tile-aligned is a 167% improvement. - Aligning the temp buffer chunks to src tiles is a 20% improvement. - Using a 64k buffer instead of a tile-sized buffer is a 14% improvement. This buffer size appears optimal in my benchmark, smaller and larger buffers are both slower. Skipping the chunk approach and just (de)tiling to a temp buffer that fits the whole image (what NVK does) is also slower. - I had no luck with attempts at a direct tiled->tiled copy algorithm that didn't need a temp buffer. The fastest I got was ~1/4 the speed of the temp buffer implementation. Signed-off-by: Olivia Lee <olivia.lee@collabora.com> Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35910>
`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.