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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
68e25f33da
Don't waste 1MB per batch for descriptors that may be completely unused. Instead, upload the scissor and depth bias arrays at submit time. This is a simple solution to a silly problem: we can't grow the scissor/depth bias arrays, and we don't know how big they will be at draw time. We could... 1. Statically allocate large buffers? Waste lots of memory. 2. Statically allocate small buffers? Forces too much flushing. 3. Dynamically allocate a growable GPU buffer? Requires either reading back write-combined memory contents, or maintaining a CPU copy in addition to extra GPU copies, or doing complicated MMU shenanigans. The first two options are slow and the last is complicated. Instead, we upload these descriptors to a dynamically allocated CPU-side which gets copied just once to the GPU at submit-time when the exact size is known, minimizing wasted memory and copies and avoiding any unnecessary flushing or WC memory reads. In addition, this patch makes sure we flush if we would overflow with more than 65535 scissor descriptors in a batch. This is a (minor) bug fix. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19971> |
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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://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.