[Bug 105496] Using a single-plane imageview from a multi-plane image is broken

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Mar 14 01:34:57 UTC 2018


            Bug ID: 105496
           Summary: Using a single-plane imageview from a multi-plane
                    image is broken
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: atomnuker at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net


As the title suggests, creating a VkImageView with a format of
VK_FORMAT_R8_UNORM out of a VkImage with format
VK_FORMAT_G8_B8_R8_3PLANE_420_UNORM (and the mutable flag enabled too) and then
using the image as a storage image (e.g. layout (set = 0, binding = 0, rgba8)
uniform readonly image2D input_img; inside a GLSL shader) will result in
vec4(0.0f) actually being read instead of the pixel values inside the image.
Writing to such images however seems to be successful.

I've uploaded some code to replicate this, though I'm afraid its not a small
example. The repo is https://github.com/atomnuker/FFmpeg/tree/exp_vulkan. To
compile run ./configure with --enable-vulkan. The shader is in
libavfilter/vulkan/unsharp.comp and the code which creates the imageviews is in
libavfilter/vf_unsharp_vulkan. To run, "./ffmpeg_g -init_hw_device
"vulkan=vk:0" -i <some sane video or image> -filter_hw_device vk -vf
-y out.mkv". I don't have glslang hooked up to the build system yet so you need
to regenerate the .h file with "glslangValidator -V unsharp.comp
--variable-name "unsharp_vulkan_comp_spv" -o unsharp.comp.h".

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