[Bug 68365] [SNB Bisected]Piglit spec_ARB_framebuffer_object_fbo-blit-stretch fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68365

--- Comment #12 from Neil Roberts <neil at linux.intel.com> ---
I think we can downgrade the priority of this bug because it's arguably not a
regression. The underlying bug is that on Sandybridge linear filtering is
slightly less accurate when using non-normalised coordinates instead of
normalised coordinates and that has presumably always been the case. The patch
that caused the regression just made glBlitFramebuffer use the blorp codepath
and the blorp codepath always uses non-normalised coordinates. However you can
replicate the actual bug even outside of glBlitFramebuffer just by using a
rectangle texture for regular rendering. The difference between filtering with
normalised and non-normalised coordinates is only slight so I don't think it
will cause any noticeable difference for an application in practice.

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