Comment # 8
on bug 103544
from Ilia Mirkin
(In reply to Roland Scheidegger from comment #7) > I guess though the question is why other mesa drivers render it correctly > and how they avoid the NaNs if they also use ieee conformant behavior (if > they actually render it correctly...). If you can get me a trace, I can have a look to see what happens with nouveau. There's additional implications from having NaN's in RT outputs, i.e. what happens in blending functions. I believe that nouveau configures the GPU for the "zero wins" style of multiplication in the blending unit. And separately, same thing for color clamps (I believe NVIDIA hw maps NaN -> 0 unconditionally for that case).
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