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This is built on the new vk_sync primitives. In the vk_physical_device, the driver provides a null-terminated array of vk_sync_type pointers in priority order. The semaphore implementation then selects the first type that meets the necessary criterion. In particular, semaphores may or may not be timelines depending on the VkSemaphoreType. It also auto-selects the semaphore type based on the external handle types provided and can down-grade as needed to support a particular external handle. The implementation itself is mostly copy+pasted from ANV. The primary difference is the fact that anv_semaphore_impl has been replaced with vk_sync. The permanent vk_sync is still embedded (like ANV) but the temporary one is a pointer. This makes stealing the temporary state as part of VkQueueSubmit a bit easier. All of the interesting stuff around waits, signals, etc. is implemented by the vk_sync interface. All this code does is wrap it all in the annoyingly detailed VkFence rules so we can provide the correct Vulkan entrypoint behavior. Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13427>
`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.