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VS, TCS, TES, and GS threads must end with a URB write message with the EOT (end of thread) bit set. For VS and TES, we shadow output variables with temporaries and perform all stores at the end of the shader, giving us an existing message to do the EOT. In tessellation control shaders, we don't defer output stores until the end of the thread like we do for vertex or evaluation shaders. We just process store_output and store_per_vertex_output intrinsics where they occur, which may be in control flow. So we can't guarantee that there's a URB write being at the end of the shader. Traditionally, we've just emitted a separate URB write to finish TCS threads, doing a writemasked write to an single patch header DWord. On Broadwell, we need to set a "TR DS Cache Disable" bit, so this is a convenient spot to do so. But on other platforms, there's no such field, and this write is purely wasteful. Insetad of emitting a separate write, we can just look for an existing URB write at the end of the program and tag that with EOT, if possible. We already had code to do this for geometry shaders, so just lift it into a helper function and reuse it. No changes in shader-db. Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Caio Oliveira <caio.oliveira@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17944> |
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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.