[Mesa-dev] [Bug 71199] [llvmpipe] piglit glean polygonOffset regression

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Nov 3 14:38:15 PST 2013


--- Comment #1 from Roland Scheidegger <sroland at vmware.com> ---
My guess would be the test is invalid.
The "mrd" meaning is very precise both in d3d10 and OpenGl, and we were being
sloppy there before - it really should be exactly one bit (for unorm depth
I quickly looked at the test and I don't quite understand what it does to find
the ideal mrd. I suspect the math doesn't work out somewhere because the float
math is right at the limits of depth buffer precision (24 bit in this case).
Do closed source drivers actually pass this (and if so I wonder what their
calculated ideal/actual mrd values are)?

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