Getting random pixels by number

There was a question on the Facebook Helpgroup:

Anybody can give me a tipp how to fill a white screen controlled with random pixels. I want to fill it based on a function, but are stucked how to achieve it. When the value is 0, 1 pixel is shown, when the value is 4, 16 pixels are shown and so on. I want to map it to the correct screen size.

This can be solved by using a Pattern CHOP with a Ramp that is being sorted randomly. Then using the new ability of the CHOPTo TOP - the values can be arranged in a square texture.


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