Connor Abbott
d37843fee1
Under the bindless model, there are 5 "base" registers programmed with a 64-bit address, and sam/ldib/ldc and so on each specify a base register and an offset, in units of 16 dwords. The base registers correspond to descriptor sets in Vulkan. We allocate a buffer at descriptor set creation time, hopefully outside the main rendering loop, and then switching descriptor sets is just a matter of programming the base registers differently. Note, however, that some kinds of descriptors need to be patched at command recording time, in particular dynamic UBO's and SSBO's, which need to be patched at CmdBindDescriptorSets time, and input attachments which need to be patched at draw time based on the the pipeline that's bound. We reserve the fifth base register (which seems to be unused by the blob driver) for these, creating a descriptor set on-the-fly and combining all the dynamic descriptors from all the different descriptor sets. This way, we never have to copy the rest of the descriptor set at draw time like the blob seems to do. I mostly chose to do this because the infrastructure was already there in the form of dynamic_descriptors, and other drivers (at least radv) don't cheat either when implementing this. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4358>
`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 gitlab for patches submission, review and discussions.