[Bug 101004] Line has wrong coordinates when viewport width is reduced

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101004

            Bug ID: 101004
           Summary: Line has wrong coordinates when viewport width is
                    reduced
           Product: Mesa
           Version: 13.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: b7.10110111 at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 131315
  --> https://bugs.freedesktop.org/attachment.cgi?id=131315&action=edit
Test program

The attached test program draws a line. Its endpoint positions appear different
between i965 driver and llvmpipe. In program's initial state, the bug is
triggered. You can toggle the bug by pressing a key.

The bug triggers when glViewport is called with a width less than window width
(namely, 0.6*windowWidth in the test).

glxinfo reports:
OpenGL renderer string: Mesa DRI Intel(R) Haswell Server 
OpenGL version string: 3.0 Mesa 13.0.6 (git-fcef88d)

Video controller from lspci:
Intel Corporation Xeon E3-1200 v3 Processor Integrated Graphics Controller (rev
06)

CPU name from /proc/cpuinfo:
Intel(R) Xeon(R) CPU E3-1226 v3 @ 3.30GHz

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