In the absence of solution to my previous dilemma, I've delved into glsl and
as a result, I've arrived to two roadblocks/questions:
1) does jitter work with sampler2D instead of sampler2DRect (by the same
token texture2D as opposed to texture2DRect)?
2) in sh.passthrudim.vp.glsl, does texdim0 contain pixel width/height of the
texture or is it values between 0 and 1?