It is a GEGL filter - part of the move (eventually) to non-destructive editing.
https://en.wikipedia.org/wiki/GEGL
Many of the Gimp 2.9 filters are now GEGL and work directly on the canvas. Most of the blurs, most of the noise filters, bump & displacement maps for example.
https://en.wikipedia.org/wiki/GEGL
Many of the Gimp 2.9 filters are now GEGL and work directly on the canvas. Most of the blurs, most of the noise filters, bump & displacement maps for example.