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softpipe/aniso: move DDQ calculation to after scaling.

Dave Airlie requested to merge airlied/mesa:softpipe-aniso-fix into main

I've read the papers on EWA filters and it seems like the calculate DDQ = 2 * A after the scaling of A happens. This seems to make things less blurry and more like real aniso.

here's a link to the paper. https://www.cs.cmu.edu/~ph/texfund/texfund.pdf

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