NVIDIA SSAA/Downsampling

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NV has better overall AF quality ever since G80. In fact, there have been no visible changes of the AF algorithm for the past four years -- GF100 outputs virtually the same texture quality as the old G80. The problem with ATi's case is the severe under-sampling, visible in most high-frequency/detailed textures all over the place, like subtle shimmering and sharp MIP stage transitions. The angular pattern -- being invariant or not -- should not be used as exhaustive quality measurement.