[Mesa-dev] [Bug 81174] New: Gallium: GL_LINE_LOOP broken with more than 512 points

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81174

          Priority: medium
            Bug ID: 81174
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: Gallium: GL_LINE_LOOP broken with more than 512 points
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: florianlink at gmail.com
          Hardware: Other
            Status: NEW
           Version: 10.2
         Component: Mesa core
           Product: Mesa

Created attachment 102536
  --> https://bugs.freedesktop.org/attachment.cgi?id=102536&action=edit
This should be a circle...

The error ocurrs on Windows 7 and on Linux with Mesa softpipe and llvm.

There seem to be random lines between non-adjacent points in the line loop.
When switching to GL_LINE_STRIP, the error disappears.

Attached you find a screenshot and a Qt example program (see glwidget.cpp for
the minimal GL_LINE_LOOP code).

The bug only happens when there are more than about 512 lines and there are
more errors the more lines are in the loop (as seen in the screenshot).

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