95eec5a0dd
This implements a replacement for the previous implementation of nir_intrinsic_load_barycentric_at_offset that relied on the Pixel Interpolator shared function, since it's going to be removed from the hardware from Xe2 onwards. That's okay since we can get all the primitive setup information needed for interpolation at an arbitrary coordinate: We use the X/Y offset relative to the "X/Y Start" coordinates from the thread payload order to evaluate the plane equations also provided in the thread payload for each barycentric coordinate of each polygon. The evaluation of the barycentric plane equations (and the RHW plane equation for perspective-correct interpolation) uses the accumulator and MAD/MAC for ALU efficiency, but that means we need to manually split instructions to fit the width of the accumulator. The division and scaling for perspective-correct interpolation is also now done in the shader if necessary. Note that even though this is only immediately useful on Xe2+, the thread payload numbers are filled out for older platforms, and the EU restrictions of previous Xe platforms are taken into account, mostly for the purposes of testing and performance evaluation. Reviewed-by: Caio Oliveira <caio.oliveira@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29847>
`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 $ 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://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.