;; Fisheye effect - barrel/pincushion lens distortion

(define-effect fisheye
  :params (
    (strength :type float :default 0.3 :range [-1 1])
    (center_x :type float :default 0.5 :range [0 1])
    (center_y :type float :default 0.5 :range [0 1])
    (zoom_correct :type bool :default true)
  )
  (let* ((w (width frame))
         (h (height frame))
         (cx (* w center_x))
         (cy (* h center_y))
         (coords (fisheye-displace w h strength cx cy zoom_correct)))
    (remap frame (coords-x coords) (coords-y coords))))