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We can use the PRIMITIVE_COUNTS_FEEDBACK packet to write various primitive counts to a buffer, including the number of primives written to transform feedback buffers, which will handle buffer overflow correctly. There are a couple of caveats with this: Primitive counters are reset when we emit a 'Tile Binning Mode Configuration' packet, which can happen in the middle of a primitives query, so we need to read the buffer when we submit a job and accumulate the counts in the context so we don't lose them. We also need to do the same when we switch primitive type during transform feedback so we can compute the correct number of recorded vertices from the number of primitives. This is necessary so we can provide an accurate vertex count for draw from transform feedback. v2: - When computing the number of vertices for a primitive, pass in the base primitive, since that is what the hardware will count. - No need to update primitive counts when switching primitive types if the base primitives are the same. - Log perf warning when mapping the primitive counts BO for readback (Eric). - Only emit the primitive counts packet once at job end (Eric). - Use u_upload mechanism for the primitive counts buffer (Eric). - Use the XML to generate indices into the primitive counters buffer (Eric). Fixes piglit tests: spec/ext_transform_feedback/overflow-edge-cases spec/ext_transform_feedback/query-primitives_written-bufferrange spec/ext_transform_feedback/query-primitives_written-bufferrange-discard spec/ext_transform_feedback/change-size base-shrink spec/ext_transform_feedback/change-size base-grow spec/ext_transform_feedback/change-size offset-shrink spec/ext_transform_feedback/change-size offset-grow spec/ext_transform_feedback/change-size range-shrink spec/ext_transform_feedback/change-size range-grow spec/ext_transform_feedback/intervening-read prims-written Reviewed-by: Eric Anholt <eric@anholt.net> |
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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.html <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.html <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 `Freenode's #dri-devel <irc://chat.freenode.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.html <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.html <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses email mailing-lists for patches submission, review and discussions.