Zamuel_a wrote:Effects like pixel precise dist in both x and y and the image that zooms and rotates or the 4 bitplanes zoom scrollers.
My immediate guess as to how the dists are done is precalculation of the permutations in a regular 8 pix wide (or 16, but I think they'd need too much mem) movep dist. Memory usage is halved if you only need it to be 2 pix wide instead of 1 etc.
The effects I was talking about starts at about 3:45 in the video
Trivia: You can link directly to a specific timestamp in a Youtube vid http://www.youtube.com/watch?v=HQ0VCg_K5UY&t=3m45s