Alright, What I'm looking to learn how to do is make effect like the "Geiss" screensaver. In other words, I need to know how to take a 2D image, and then warp it. The 2 main effects that I want to know how to do are...
1) Where the screen zooms towards you (I think it's called Blitter feedback)
2) Where a spiral moves over the image. (I like the entire range of these effects)
The closest I've come to understanding these effects is that they use tables, and then I'm assuming they modify the tables using an equation, then render the table. Also, the table equations seem to be polar ones..
I found one equation set that seems to do d=d*d;and r=r*r
(where d=distance and r=angle) to the table, and it produces a "hill" effect.
Any help would be greatly apprecatied!