[SHARE] xray.jit.water on GPU with jit.gl.pix

Hello all,
it's 4 days that I'm working on this patch and it's almost working but i need your help to finish it,
I'm trying to port on GPU the nice Wesley Smith object X-ray.jit.water object
but there is an error I don't know where

here's the code of the object and after my patch,
can anyone help me to finish this patch?

Thank you
micron

NOTE: starting from a single white pixel the first iteration gives same result of X-ray.jit.water but from second iteration the result is different.

for(j=1; j < width-1; j++) {
                    fop[j] = fip1[j] + dampFactor*(fip1[j] - prev_fp[j] )
                        - timeSpaceFactor*fip2[j]*(4*fip1[j] - fip1[j-1] - fip1[j+1] - fip1_up[j] - fip1_down[j]
                        + 0.5*(4*fip1[j] - fip1_up[j-1] - fip1_up[j+1] - fip1_down[j-1] - fip1_down[j+1] ));

                    CLIP(fop[j], -1, 1);
                }