[Mesa-dev] [Bug 109807] Add more granular multiarch usage for Mesa Vulkan overlay JSON manifest

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109807

            Bug ID: 109807
           Summary: Add more granular multiarch usage for Mesa Vulkan
                    overlay JSON manifest
           Product: Mesa
           Version: git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/Common
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: shtetldik at gmail.com
                CC: airlied at freedesktop.org, chadversary at chromium.org,
                    daniel at fooishbar.org, jason at jlekstrand.net

After recent changes, VkLayer_MESA_overlay.json references implicit
libVkLayer_MESA_overlay.so which supposedly should be accessible to the loader
(either in common library cache or through LD_LIBRARY_PATH).

It would be better for it to use explicit reference, similar to how actual
Vulkan ICD manifests are doing it. But for that, there should be separate JSON
loader manifest for each architecture. Is it currently possible?

Actual ICDs do support it, i.e. you can find:

/usr/share/vulkan/icd.d/radeon_icd.i686.json
/usr/share/vulkan/icd.d/radeon_icd.x86_64.json

So loader knows which one to pick depending on the arch even during implicit
loading.

Would it work for layers?

I.e. for example:

/usr/share/vulkan/explicit_layer.d/VkLayer_MESA_overlay.i686.json
/usr/share/vulkan/explicit_layer.d/VkLayer_MESA_overlay.x86_64.json

Each of them referencing explicit .so location? Or that requires fixing the
layer loading logic first?

I also opened this to be able to load layer JSON explicitly, like ICD manifests
allow:

https://github.com/KhronosGroup/Vulkan-Loader/issues/154

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