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  1. Qt
  2. QTBUG-137986

rhi/vulkan: Do something about VUID-vkQueueSubmit-pSignalSemaphores-00067

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    • eab1295c8 (dev), c01badcf6 (6.10), c4adef6e1 (6.9), 5bdc1185b (tqtc/lts-6.8)

      vkQueueSubmit(): pSubmits[0].pSignalSemaphores[0] (VkSemaphore 0x140000000014) is being signaled by VkQueue 0x1dd34c87b50, but it may still be in use by VkSwapchainKHR 0x90000000009.
      Here are the most recently acquired image indices: 2, 1, 0, 0, 1, [0], 1, 2.
      (brackets mark the last use of VkSemaphore 0x140000000014 in a presentation operation)
      Swapchain image 0 was presented but was not re-acquired, so VkSemaphore 0x140000000014 may still be in use and cannot be safely reused with image index 2.
      Vulkan insight: One solution is to assign each image its own semaphore. Here are some common methods to ensure that a semaphore passed to vkQueuePresentKHR is not in use and can be safely reused:
              a) Use a separate semaphore per swapchain image. Index these semaphores using the index of the acquired image.
              b) Consider the VK_EXT_swapchain_maintenance1 extension. It allows using a VkFence with the presentation operation.
      The Vulkan spec states: Each binary semaphore element of the pSignalSemaphores member of any element of pSubmits must be unsignaled when the semaphore signal operation it defines is executed on the device (https://vulkan.lunarg.com/doc/view/1.4.313.2/windows/antora/spec/latest/chapters/cmdbuffers.html#VUID-vkQueueSubmit-pSignalSemaphores-00067)
      

      Vulkan SDK 1.4.313.2 (not present with validation layers bundled with 1.4.304.0)

        For Gerrit Dashboard: QTBUG-137986
        # Subject Branch Project Status CR V

            lagocs Laszlo Agocs
            lagocs Laszlo Agocs
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