detfx and dx9 spec

[MrBond]

If I remember correctly, the DX9 spec requires 24bit floating point precision, and this was presumably a major factor in why nvidia has been unable to secure WHQL cert thus far.

I just browsed through the nvidia site and noticed the new DetFXs claim to be WHQL certified for the GFFX series only (sounds like the first catalyst 3.0 release ). So, has anyone been able to check up on whether nvidia is truly running at 24bit, or have they been able to convince MS that it doesn't matter?

 

[g__day]

I thought NVidia adopted the IEEE 32 bit standard and can only fall back to 16 bit lower quality precision - so when a directx 9 game asks for high colour precision what does NVidia do - ignore it - surpass it and take a huge performance hit or go the low road for speed with poorer image quality?

Interesting question.

 

[Ostsol]

I think it was that the minimum for texture addressing was 24 bit and the minimum for arithmetic instructions was 16 bit with the precision hint. . . I might be wrong, though. . . It was posted here a while back. . .