;; Swirl effect - spiral vortex distortion

(define-effect swirl
  :params (
    (strength :type int :default 1 :range [-10 10])
    (radius :type float :default 0.5 :range [0.1 2])
    (center_x :type float :default 0.5 :range [0 1])
    (center_y :type float :default 0.5 :range [0 1])
    (falloff :type string :default "quadratic")
  )
  (let* ((w (width frame))
         (h (height frame))
         (cx (* w center_x))
         (cy (* h center_y))
         (coords (swirl-displace w h strength radius cx cy falloff)))
    (remap frame (coords-x coords) (coords-y coords))))