RGB Shift
RGB Shift CI Filter for Quartz Composer.
Kernel:
kernel vec4 RGBEffect(sampler image, vec2 offset)
{
vec2 coord = destCoord();
float r = sample(image, samplerTransform(image, coord - offset)).r;
vec2 ga = sample(image, samplerTransform(image, coord)).ga;
float b = sample(image, samplerTransform(image, coord + offset)).b;
return vec4(r, ga[0], b, ga[1]);
}
Filter Function:
function myROIFunction(samplerIndex, dstRect, offset) {
var roiRect = new Vec(dstRect);
var extra = new Vec(Math.abs(offset.x), Math.abs(offset.y));
if (dstRect.x > extra.x)
roiRect.x -= extra.x;
if (dstRect.y > extra.y)
roiRect.y -= extra.y;
roiRect.z += extra.x;
roiRect.w += extra.y;
return roiRect;
}
RGBEffect.ROIHandler = myROIFunction;
function __image main(__image image, __number amount, __number angle) {
s = amount / 2;
offset = new Vec(s * Math.cos(angle), s * Math.sin(angle));
return RGBEffect.apply(image.definition, offset, image, offset);
}
Download (qcFX for VDMX)
Tags: code, Quartz Composer, VDMX, visuals