;; (v-osc3 rate bufpos freq1 freq2 freq3)

;; Three variable wavetable oscillators.

;; A wavetable lookup oscillator which can be swept smoothly across
;; wavetables. All the wavetables must be allocated to the same
;; size. Fractional values of table will interpolate between two
;; adjacent tables. This unit generator contains three oscillators at
;; different frequencies, mixed together.

;; This oscillator requires a buffer to be filled with a wavetable
;; format signal.  This preprocesses the Signal into a form which can
;; be used efficiently by the oscillator.  The buffer size must be a
;; power of 2.

;; This can be acheived by creating a Buffer object and sending it one
;; of the "b_gen" messages ( sine1, sine2, sine3 ) with the wavetable
;; flag set to true.

;; Note about wavetables: Vosc3 requires the b_gen sine1 wavetable
;; flag to be ON.

;; Allocate and fill tables 0 to 7 with a generated list of harmonic
;; amplitudes.

(with-sc3
 (lambda (fd)
   (let* ((square
	   (lambda (a) (* a a)))
	  (nth
	   (lambda (i)
	     (async fd (b-alloc i 1024 1))
	     (let* ((n (expt (+ i 1) 2))
		    (a (map (lambda (j)
			      (square (/ (- n j) n))) 
			    (enum-from-to 0 (- n 1)))))
	       (async fd (b-gen1 i "sine1" (cons 7 a)))))))
     (for-each nth (enum-from-to 0 7)))))

;; oscillator at buffers 0 through 7.

(let ((p (mouse-x kr 0 7 0 0.1))
      (f1 (mce2 240 241))
      (f2 (mce2 240.27 241.1))
      (f3 (mce2 240.43 239.71)))
  (audition (out 0 (mul (v-osc3 ar p f1 f2 f3) 0.2))))

;; Reallocate buffers while oscillator is running.

(with-sc3
 (lambda (fd)
   (for-each
    (lambda (i)
      (async fd (b-gen1  i "sine1" (cons 7 (replicate-m 16 (random 0 1))))))
    (enum-from-to 0 7))))