[Mesa-dev] [Bug 80183] New: [llvmpipe] triangles with vertices that map to raster positions > viewport width/height are not displayed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80183

          Priority: medium
            Bug ID: 80183
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: [llvmpipe] triangles with vertices that map to raster
                    positions > viewport width/height are not displayed
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: florianlink at gmail.com
          Hardware: Other
            Status: NEW
           Version: 10.2
         Component: Other
           Product: Mesa

Created attachment 101296
  --> https://bugs.freedesktop.org/attachment.cgi?id=101296&action=edit
Traces that reproduce the problem

When using llvmpipe/64bit, we experience missing triangles when one of the
vertices of the triangle has a raster position outside of the viewport
top/right. 

It only happens when a GLSL shader is active, not when fixed function rendering
is used. It only happens with llvmpipe, using softpipe all is fine (also with
GLSL shader).

Attached you find a apitrace that works and a apitrace that shows the problem.

While MeVisLab.ok.trace (Frame 11) shows a textured polygon,
MeVisLab.wrong.trace (Frame 13) is rendered black, while it should show the
same textured polygon, clipped to the viewport width/height.

The traces contain some MeVisLab network rendering as well, these can be
ignored.

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