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In https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35802 we will significantly rework geometry shaders & transform feedback. In the new approach, transform feedback is executed as part of the hardware vertex shader, meaning the vertex shader needs to write out all the "copies" of the same value into different parts of the XFB buffer. In the general case of a GS writing triangle strips, we get 0-3 copies. This is good and lets us parallelize XFB better with GS. In the case of a VS alone with XFB, we insert a passthrough GS. In that case special case, we can only get at most 1 copy, so if we can prove the length of the output strip is 3 we can delete 2/3 of the shader. Anyway, the only thing preventing NIR from doing that optimization is failing to see through some conditionals, fixed by optimizing with the law of trichotomy. We could add other variants of this pattern (signed vs unsigned, iand vs ior/ixor) if we expect anything else to hit this other than my boutique use case. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Marek Olšák <maraeo@gmail.com> Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35802> |
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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.