39f06e2848
Chris Wilson noted that u_default_texture_subdata's transfer path sometimes results in wasteful double copies. This patch is based on an earlier path he wrote, but updated now that we have staging blits for busy or compressed textures. Consider the case of idle, non-CCS-compressed, tiled images: The transfer-based CPU path has to return a "linear" mapping, so upon map, it mallocs a temporary buffer. u_default_texture_subdata then copies the client memory to this malloc'd buffer, and transfer unmap performs a tiled_memcpy to copy it back into the texture. By writing a direct texture_subdata() implementation, we're able to directly do a tiled_memcpy from the client memory into the destination texture, resulting in only one copy. For linear buffers, there is no advantage to doing things directly, so we simply fall back to u_default_texture_subdata()'s transfer path to avoid replicating those cases. We still may want to use GPU staging buffers for busy destinations (to avoid stalls) or CCS-compressed images (to compress the data), at which point we also fall back to the existing path. We thought to try and use a tiled temporary, but this didn't appear to help. Improves performance in x11perf -shmput500 by 1.96x on my Icelake. Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2500 Reviewed-by: Tapani Pälli <tapani.palli@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3818> |
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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 `Freenode's #dri-devel <irc://chat.freenode.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.