Manipulating WebGL Effects

I'm wondering if there is a way to manipulate webgl effects further than the parameters given to us.

ie. If you put a "bulge" effect, how would you control the central location of the bulge, or even put multiple bulges on that can distort in a pattern based on something like mouse drag?

No, there isn't. You could modify the effect manually though, I think, but you'd have to dig into the code.

TiAm - I had a feeling. Thanks!