left/right to change "r" (essentially, spread of the color palette)
up/down to change "n" (size of bayer matrix (2n)^2 * (2n)^2)
z/x (or c/v) to change palettes
thanks:
https://www.shadertoy.com/view/7sfXDn
https://en.wikipedia.org/wiki/Ordered_dithering
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