Alyssa Rosenzweig
c445c29263
The hardware only supports aligned loads and stores. That applies to vertex buffer loads as well. As such, we need to ensure that the base address of vertex buffers, the stride, and the offset are all aligned to the vertex buffer format, ensuring that the load itself is aligned. Mesa has a CAP for that, PIPE_CAP_VERTEX_ATTRIB_ELEMENT_ALIGNED_ONLY, which ensures that these conditions are met and will rewrite a vertex buffer on the CPU in the off chance that they're not. This is a bug fix compared to the old code, because it requires that offsets and base addresses are aligned (not just the strides like before). It's also an optimization compared to the old code, because it does not require 4 byte alignment for 8-bit and 16-bit formats. In fact, it doesn't require any alignment for 8-bit formats. This will avoid needless CPU work for smaller formats. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19996>
`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.