ATI responds to trilinear filtering claims
There has been a lot of discussion about our trilinear filtering algorithms recently.
The objective of trilinear filtering is to make transitions between mipmap levels as near to invisible as possible. As long as this is achieved, there is no right or wrong way to implement the filtering.
We have added intelligence to our filtering algorithm to increase performance without affecting image quality. As some people have discovered, it is possible to show differences between our filtering implementations for the Radeon 9800XT and Radeon X800.
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Source: DriverHeaven
