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A comment on Gentle introduction to GPUs inner workings. Parent comment

Re:Gentle introduction to GPUs inner workings by Jasper_ on Saturday October 02, 2021 @05:59PM (#28732467)
It's defined to work on a 2x2 grid called a quad. If you're the top left pixel, then dFdX(v) = v(x+1,y) - v. If you're the top right pixel, then it's dFdX(v) = v(x-1,y) - v
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