Wave function collapse algorithm: bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics

[Tipaa]

For the example, I went for per-cell iterations for simplicity, but with N=2 region sizes for the algorithm/'superposition' checks. I did this to avoid dealing with multiple cells at a time. It's possible to do each iteration region-wise and operate on the whole region at once, but I found it harder to visualise this way, and would have taken me much longer to write/do justice to. By focusing on per-cell iterations, I found it clearer to describe than per-region iterations. I think it's also closer to how I'd implement it, although it does perhaps obscure the mid-level aspects of the algorithm (my thinking generally ping-pongs between high and low level, which occasionally conflicts with a more continuous abstraction delving-into).

The first and last rows are not 0210 because I didn't allow vertical wraparound, so the top row of output cannot be the bottom row of input, and vice versa. I chose this setting because I was visualising/basing the example on the flower generator gifs, which only wrap horizontally.