This one?
No.
Just kidding, it’s called downsampling and it’s used to reduce the screen size so you have less pixels to process which makes the filter faster. You could use it on its own too I suppose.
I’ve already made a question thread about it when I ran into problems so I’ll just add a final solution there so I don’t clutter this one and that future people may find it too.
The downSamplingFactor you can set is the number the screen size is divided by on x and y. So setting it to 2 will give you one quarter of the screen, 4 to 1/16 and so on.