Lucas Stach
41b08a2040
Older cores have a hardware bug where the stencil test misbehaves when the valuemask is 0 in the back stencil. The workaround is to effectively switch to single sided stencil and hope for the best. This seems to be okay for most actual use-cases and tests, as a 0 valuemask is quite rare. However, as 0 is a valid value for the mask the workaround breaks some edge cases. Newer cores don't seem to require the workaround and operate correctly with all stencil valuemasks, so drop the workaround for them. I don't know which feature bit tells us about the bugfix. I made an educated guess by checking behavior on multiple GPUs: GC880r5106 and GC2000r5108 need the workaround, GC3000r5450, GC7000r6204 and GC600r4653 work fine without it. By comparing the set BugFixes feature bits between the cores and the fact that BugFixes15 already fixes some PE issues, I think this one is the most likely candidate. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35704>
`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.