https://bugs.freedesktop.org/show_bug.cgi?id=98846
Bug ID: 98846
Summary: triangle clipping causes wrong vertex's attribute to
be broadcasted for flat interpolation
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/swr
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
See example at
generated_tests/spec/glsl-1.10/execution/interpolation/interpolation-none-gl_FrontColor-flat-fixed.shader_test
This sets a position s.t. the clipping at +/-1 takes effect. And it works just
fine - the clipped result is correct. However the color output is green instead
of blue - the first vertex's color is broadcast to the new triangles rather
than the last vertex's color.
I traced through the code a bit, and it seems to *want* to do the right thing,
but for some reason doesn't. Smooth shading works fine in this clipping
scenario.
With user-provided clip planes (or distances), i.e. in where the clipping stage
does nothing, the color is picked correctly.
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