Faith Ekstrand
6266751749
Vulkan WSI allows you to present to multiple swapchains at the same time. If it weren't for some of the Vulkan sync rules, this wouldn't be a big deal as we could just loop and do the present per-swapchain. However, the whole present takes a single set of wait semaphores and we can only wait on them once. Right now this works because we do at least one QueueSubmit2() per-swapchain on the present queue. Since those all happen on the same queue, we can just wait on the semaphores in the first present and all the others will pick up that wait thanks to queue ordering. However, this requires doing a lot of vkQueueSubmit(). This commit changes the vkQueuePresent() flow so that we do a single vkQueueSubmit2() on the present queue for all swapchains that consumes the wait semaphores and signals any per-image semaphores and fences. In the case where separate blit queues are used, we just signal blit semaphores in the first vkQueueSubmit2() on the present queue and then do a submit per-swapchain for each of the blit queue blits and signal per-image semaphores and fences with that submit. This significantly reduces the number of vkQueueSubmit2() calls being made by vkQueuePresent() and also breaks the dependency on implicit ordering of submits, which will be important in the next commit. Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36827>
`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.