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This change adds a Vulkan screenshot layer that allows users to take screenshots from a Vulkan application, but has an emphasis on performance, decreasing the performance impact on the application involved. This allows for automated setups to use this layer to take screenshots for navigating various in-application menus. This layer works by hooking into various common Vulkan setup functions, until it enters the vkQueuePresentKHR function, and from there it copies the current frame's image from the swapchain as an RGB image to host-cached memory, where we will receive the information as a framebuffer pointer. From there, we copy the framebuffer contents to a thread that will detach from the main process so it can write the image to a PNG file without holding back the main thread. This layer was created from using the existing overlay layer as a template, then adding portions of LunarG's VulkanTools screenshot layer: https://github.com/LunarG/VulkanTools/blob/main/layersvt/screenshot.cpp More specifically, there were usages of functions, along with modifications of various functions from screenshot.cpp in the VulkanTools project, used in screenshot.cpp. There are some sections of the screenshotting functionality that remain unmodified from the original screenshot.cpp file in VulkanTools, including the global locking structures and the writeFile() function, which takes care of obtaining the images from the swapchain. There were various areas in which modifications were made, including how images are written to a file (using PNG instead of PPM, introducing threading, added fences/semaphores, etc), along with many smaller changes. v2: Fix segfault upon application exit v3: Fix filename issue with concatenation, along with some leftover memory handling that wasn't cleaned up. v4: Fix some error handling and nits v5: Fix output directory handling Reviewed-by: Ivan Briano <ivan.briano@intel.com Signed-off-by: Casey Bowman <casey.g.bowman@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30527> |
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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.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.