[Bug 93418] Geometry Shaders output wrong vertices on Sandy Bridge

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93418

            Bug ID: 93418
           Summary: Geometry Shaders output wrong vertices on Sandy Bridge
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: bugs at linkmauve.fr
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 120555
  --> https://bugs.freedesktop.org/attachment.cgi?id=120555&action=edit
apitrace reproducing this bug (starts at frame 470)

Some vertices seem to be wrongly put on the (0,0) (1,1) diagonal when using a
geometry shader on Sandy Bridge.

Screenshots of this bug:
http://i.imgur.com/c8WhpF5.png
http://linkmauve.fr/files/dolphin.png (from the previous trace)

Related Dolphin bug report:
https://bugs.dolphin-emu.org/issues/9166

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