Bug ID: 105464
           Summary: Reading per-patch outputs in Tessellation Control
                    Shader returns undefined values
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/radeon
        QA Contact:

Created attachment 138037
Patch for tessellation demo to reproduce the issue

As mentioned in the title, reading a per-patch output variable that was written
by a different invocation produces undefined results even after a barrier()

The attached patch changes the tessellation control shader of the
'tessellation' demo from Sascha Willems' Vulkan samples in that it reads the
tessellation levels from a per-patch output array. Note that the shader needs
to be recompiled manually in order to reproduce the issue.

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