;;;
;;; Lorenz
;;;

;;; defines where the program is located:

(defparameter lorenz-path "/usr/ccrma/web/html/courses/220b/topics/chaosfractals/examples/cbn/code/bin/lorenz")

;;; this function calls the "lorenz" program as a separate process
;;; and grabs and parses the results into three returned values, 
;;; each one a list of the 5000 coordinate points. Run the "lorenz"
;;; program from a terminal with no arguments to view the 3d curve...

(defun lorenz ()
  (let* ((process (extensions:run-program lorenz-path (list "-data")
					  :wait nil
					  :input :stream
					  :output :stream
					  :error :output)))
    (if (not process)
	(error "could not run ~s~%" lorenz-path)
      (let* ((stream (extensions:process-output process))
	     (input (extensions:process-input process)))
	(format t ";; running ~s with process=~s~%" lorenz-path process)
	(multiple-value-bind (x y z)
	    (loop 
	      with xs = '()
	      with ys = '()
	      with zs = '()
	      for line = (read-line stream nil nil)
	      while line do
	      (multiple-value-bind (x y0)
		  (read-from-string line :preserve-whitespace t)
		(setf line (subseq line y0 (length line)))
		(multiple-value-bind (y z0)
		    (read-from-string line :preserve-whitespace t)
		  (setf line (subseq line y0 (length line)))
		  (multiple-value-bind (z end)
		      (read-from-string line :preserve-whitespace t)
		    (setf xs `(,.xs ,x)
			  ys `(,.ys ,y)
			  zs `(,.zs ,z)))))
	      finally (return (values xs ys zs)))
	  (extensions:process-wait process)
	  (values x y z))))))

;;; a with-sound that gets the 2 lists of coordinates from "lorenz"
;;; and maps them to three parameters on the generated notes:

(with-sound(:srate 44100)
  (multiple-value-bind (x y z)
      ;; get 3d coords from the lorenz curve...
      (lorenz)
    (let* (;; get range of each returned coordinate
	   (xlimits (loop for xi in x 
		      maximize xi into maxx
		      minimize xi into minx
		      finally (return (list minx maxx))))
	   (ylimits (loop for yi in y 
		      maximize yi into maxy
		      minimize yi into miny
		      finally (return (list miny maxy))))
	   (zlimits (loop for zi in z 
		      maximize zi into maxz
		      minimize zi into minz
		      finally (return (list minz maxz)))))
      (format t "xl=~s, yl=~s, zl=~s~%" xlimits ylimits zlimits)
      (loop
	;; change this to get more notes generated...
	repeat 200
	for xi in x
	for yi in y
	for zi in z
	for time = 0 then (+ time (* 0.3 (/ (- xi (first xlimits))
					    (- (second xlimits)(first xlimits)))))
	for freq = (+ 100 (* 2000 (/ (- yi (first ylimits))
				     (- (second ylimits)(first ylimits))))) 
	for brightness = (+ 0.2 (* 5 (/ (- zi (first zlimits))
					(- (second zlimits)(first zlimits)))))
	do
	(format t "~s:~s " time freq)
	(fm-violin time 0.4 freq 0.05 :fm-index brightness)))))

;;; a version with different mappings...

(with-sound(:srate 44100)
  (multiple-value-bind (x y z)
      ;; get 3d coords from the lorenz curve...
      (lorenz)
    (let* ((notes 200)
	   ;; get range of each returned coordinate
	   (xlimits (loop for xi in x
		      repeat notes
		      maximize xi into maxx
		      minimize xi into minx
		      finally (return (list minx maxx))))
	   (ylimits (loop for yi in y 
		      repeat notes
		      maximize yi into maxy
		      minimize yi into miny
		      finally (return (list miny maxy))))
	   (zlimits (loop for zi in z 
		      repeat notes
		      maximize zi into maxz
		      minimize zi into minz
		      finally (return (list minz maxz)))))
      (format t "xl=~s, yl=~s, zl=~s~%" xlimits ylimits zlimits)
      (loop
	repeat notes
	for xi in x
	for yi in y
	for zi in z
	for rhythm = (+ 0.05 (* 0.4 (/ (- xi (first xlimits))
				       (- (second xlimits)(first xlimits)))))
	for time = 0 then (+ time rhythm)
	for freq = (floor (+ 24 (* 48 (/ (- yi (first ylimits))
					 (- (second ylimits)(first ylimits))))))
	for brightness = (+ 0.2 (* 5 (/ (- zi (first zlimits))
					(- (second zlimits)(first zlimits)))))
	do
	(format t "~s:~s [~s]~%" time freq xi)
	(fm-violin time (* 1.1 rhythm) (hertz freq) 0.05 :fm-index brightness)))))