[Bug 83533] New: [UBO] nested structures don't get appropriate padding

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83533

          Priority: medium
            Bug ID: 83533
          Assignee: idr at freedesktop.org
           Summary: [UBO] nested structures don't get appropriate padding
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: idr at freedesktop.org
          Hardware: Other
            Status: NEW
           Version: git
         Component: glsl-compiler
           Product: Mesa

Created attachment 105808
  --> https://bugs.freedesktop.org/attachment.cgi?id=105808&action=edit
Test case

Looking at the IR dump, the compiler frontend generates

  (expression bvec2 ubo_load (constant uint (0)) (constant uint (8)))

to load s2.bv.x.  However, the GL API (correctly) believes that s2.bv is at
offset 16.  Deleting any field from S1 or S2 (or putting the contents of S2
directly in the UBO) masks the problem.  It seems that some part of the
compiler stack is not putting padding after s1 to align bv to a vec4 boundary.

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