[Mesa-dev] [Bug 105464] Reading per-patch outputs in Tessellation Control Shader returns undefined values

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105464

            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
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: philip.rebohle at tu-dortmund.de
        QA Contact: mesa-dev at lists.freedesktop.org

Created attachment 138037
  --> https://bugs.freedesktop.org/attachment.cgi?id=138037&action=edit
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()
call. 

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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