[Mesa-dev] [Bug 99849] Dashed lines (drawn via GLAMOR) are not rendered correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99849

            Bug ID: 99849
           Summary: Dashed lines (drawn via GLAMOR) are not rendered
                    correctly
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: mstaudt at suse.de
        QA Contact: mesa-dev at lists.freedesktop.org

This is a continuation of fdo#99708.

Basically, since X server commit d18f5801, dashed lines with zero width are
accelerated through GLAMOR, and thus through OpenGL.

When using Mesa's software renderer, this is drawn as one continuous line.

When using the Intel backend, only the first segment of the dashed line is
drawn.


Please see the original bug report against GLAMOR for screenshots and example
code to trigger this condition:

  https://bugs.freedesktop.org/show_bug.cgi?id=99708


This seems to be a bug in the OpenGL rendering, according to this thread:

  https://lists.x.org/archives/xorg-devel/2017-February/052689.html


The fact that different backends behave differently makes me think so, too.

Any help would be greatly appreciated!


For reference, the bug that originated this analysis was:

  https://bugzilla.opensuse.org/show_bug.cgi?id=1021803

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