;;; -*- syntax: common-lisp; base: 10; mode: lisp -*-

(definstrument bigbird-2 (start dur frequency freqskew amplitude
			  &key (freq-envelope '(0 0 100 1))
			       (amp-envelope '(0 0 25 1 75 1 100 0))
			       (partials '(1 .5 2 .25 3 .2))
			       (lpcoeff 1.0)
			       (degree 0.0)
			       (reverb-amount 0.0))
  (multiple-value-bind (beg end) (get-beg-end start dur)
    (let* ((gls-env (make-env :envelope freq-envelope :scaler (in-hz freqskew)))
	   (os (make-oscil :frequency frequency))
	   (fil (make-one-pole lpcoeff (- 1.0 lpcoeff)))
	   (coeffs (get-chebychev-coefficients (normalize-partials partials)))
	   (loc (make-locsig :degree degree :distance 1.0 :revscale reverb-amount))
	   (amp-env (make-env :envelope amp-envelope :scaler amplitude)))
      (run
       (loop for i from beg to end do
	 (locsig loc i (one-pole fil (* (env amp-env) (polynomial coeffs (oscil os (env gls-env)))))))))))

(defun scissor (begin-time)
  (let ((scissorf '(0 0  40 1  60 1  100 0)))
    (bigbird-2 begin-time 0.05 1800 1800 .2 
	       :freq-envelope scissorf 
	       :amp-envelope '(0 0  25 1  75 1  100 0) 
	       :partials '(1 .5  2 1  3 .5  4 .1  5 .01))))



(definstrument bigbird (start dur frequency freqskew amplitude freq-envelope amp-envelope partials
			&optional (lpcoeff 1.0) (degree 0.0) (reverb-amount 0.0))
  (multiple-value-bind (beg end) (get-beg-end start dur)
    (let* ((gls-env (make-env :envelope freq-envelope :scaler (in-hz freqskew)))
	   (os (make-oscil :frequency frequency))
	   (fil (make-one-pole lpcoeff (- 1.0 lpcoeff)))
	   (coeffs (get-chebychev-coefficients (normalize-partials partials)))
	   (loc (make-locsig :degree degree :distance 1.0 :revscale reverb-amount))
	   (amp-env (make-env :envelope amp-envelope :scaler amplitude)))
      (run
       (loop for i from beg to end do
	 (locsig loc i (one-pole fil (* (env amp-env) (polynomial coeffs (oscil os (env gls-env)))))))))))