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Old 07-08-04, 04:42 AM   #34
ChrisRay
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Join Date: Mar 2003
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Default Re: NV40 Anisotropic Filtering Investigation

Quote:
Originally Posted by zakelwe
A couple of questions

1) If bilinear has no performance hit and trilinear has no performance hit, as you state for modern graphcs cards, then why have trilinear optimisations and/or brilinear ? I'm probably being dumb on this one

2) How long did it take you to do the tests ?

I'm going to look at all the images tonight , but with so many permutations even that will take a while. And that's just for one game. I bet I set it up one way then a few days later have nagging doubts and start perpetually tweaking again ??

Regards

Andy
1) Bilinear and Trilinear filtering seperately do not have a large performance hit on modern graphic card, Ever since the introduction of the Second TMU On the Geforce cards has this been the case. However Anistropic Filtering (can sample pixels up to 16 times and still apply Trilinear filtering) This is a major fill rate bottleneck. I did mention Anistropic Filtering is a different story.

2) It took a while. I think 2 days working for several hours, It's not as much doing it. But you also have to make sense of the data and figure out what it all means.

Chris
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