https://bugs.freedesktop.org/show_bug.cgi?id=78914
Priority: medium
Bug ID: 78914
Assignee: [email protected]
Summary: Front/Backfaces do not cover the same pixels when
rasterized
Severity: normal
Classification: Unclassified
OS: All
Reporter: [email protected]
Hardware: Other
Status: NEW
Version: 10.1
Component: Mesa core
Product: Mesa
When trying to run my GLSL raycaster with Mesa/llvmpipe, I recognized artifacts
due to the wrong ray start/end positions. I render the start/end rays as boxes
where the front face is the start position and the back face is the back
position. The problem seems to be that the front/back faces do not cover the
exact same pixels in the framebuffer, even when they share the same edges.
On NVidia/ATI cards with native driver, the back faces cover the same pixels as
the front faces.
This can be reproduced by rendering a triangle with culling turned off and
blending turned on. When rotating the triangle one can see the artifacts on the
borders of the triangle.
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