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This implements an undocumented workaround for a hardware bug that affects draw calls with a pixel shader that has 0 push constant cycles when TBIMR is enabled, which has been seen to lead to a hang with Fallout 3 and Metal Gear Rising Revengeance. This hardware bug has been reported as HSDES#22020184996 which is still pending a resolution by the hardware team. However since this workaround found empirically has been confirmed to fix the issue reliably and it's relatively harmless it seems worth checking in already even though no final W/A number is available nor has the W/A json file been updated. To avoid the issue we simply pad the push constant payload to be at least 1 register. This is enabled via a brw_wm_prog_key since the driver needs to be in agreement with the compiler on whether the dummy push constant cycle is present, and it can be avoided in cases where the driver knows that TBIMR will be disabled (e.g. for BLORP). Related: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10728 Related: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11399 Fixes: |
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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.