https://bugs.freedesktop.org/show_bug.cgi?id=106646
Bug ID: 106646
Summary: Support VK_IMAGE_USAGE_STORAGE_BIT for WSI swapchain
surfaces
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: enhancement
Priority: medium
Component: Drivers/Vulkan/Common
Assignee: mesa-dev@lists.freedesktop.org
Reporter: bugs.freedesk...@haasn.xyz
CC: airl...@freedesktop.org, chadvers...@chromium.org,
dan...@fooishbar.org, ja...@jlekstrand.net
It would appear as though RADV (and ANV, judging by the code) on both X11 and
Wayland only support the following hard-coded list of VkImageUsageFlags:
caps->supportedUsageFlags =
VK_IMAGE_USAGE_TRANSFER_SRC_BIT |
VK_IMAGE_USAGE_SAMPLED_BIT |
VK_IMAGE_USAGE_TRANSFER_DST_BIT |
VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
Could we get VK_IMAGE_USAGE_STORAGE_BIT added to this list? Other Vulkan
implementations I looked at (NVIDIA and AMDVLK) both support it, and simply
adding it to the list seems to work just fine for me. (on RADV+X11, not sure
about ANV or Wayland)
Use case: I have a rendering pipeline (mpv/vlc/libplacebo) that may involve the
use of a compute shader during the final output step, in order to do HDR peak
detection. If the swapchain image supports STORAGE_BIT then I can directly
paint to screen without needing to allocate an intermediate texture and
roundtrip through a fragment shader unnecessarily.
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