https://bugs.freedesktop.org/show_bug.cgi?id=88642
Bug ID: 88642 Summary: Trilinear sampling on cubemap wrongly sampled at the border of rasterized triangle on HAWAII Product: Mesa Version: 10.4 Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/radeonsi Assignee: dri-devel@lists.freedesktop.org Reporter: vljn@ovi.com QA Contact: dri-devel@lists.freedesktop.org
Created attachment 112566 --> https://bugs.freedesktop.org/attachment.cgi?id=112566&action=edit Test case
Hi,
on a R290X with a fresh fedora 21 install (Mesa 10.4.1) a fragment shader sampling a cubemap texture with trilinear filtering is not correctly executed on the edge of rasterized triangles.
I've included a patch against piglit that display the behaviour. On my system the test display a small orange diagonal line on top of the color pattern. (the test doesn't check result atm)
I think it's related to some quad pattern : in my app that has a depth buffer the line follows the edge of the geometry.