/*
sonic focal depth
Ten layers of sound, all constantly running,
yet only one is in "sharp focus" at any time.
Move the mouse up and down to control the focal depth.
by Dan Stowell 2012-05-14, after a chat w Simon Katan.

You'll need the PV_MagSmooth ugen which is in sc3-plugins.
*/

s.boot

~nlayers = 10;
~basefreqs = ~nlayers.collect{|x|  (x * 7 + 60).midicps};
~fftbufs = ~nlayers.collect{ Buffer.alloc(s, 2048) };

(
x = {
	var layers, position, trig, ampenv, freqenv, layerpos, smoothfactor, ampfactor;
	position = MouseY.kr(0, 1);
	/* Create sounds - each layer must have spectral variation in it */
	layers = ~basefreqs.collect{ |basefreq|
		trig = Dust.ar(10);
		ampenv = Decay2.ar(trig, 0.0001, 0.2);
		freqenv = Decay.ar(trig, 0.1).linexp(0,1,1,1.5);
		SinOsc.ar(freqenv * basefreq, 0, ampenv);
	};
	/* Now apply focal effect - least smoothing (0) when the 
		mouse is at the same "position" as a layer */
	layers = layers.collect{|son, i|
		layerpos = i / (~nlayers - 1); // 0 to 1
		smoothfactor = 1 - (layerpos - position).abs.linexp(0,1, 1, 0.0005);
		ampfactor    =     (layerpos - position).abs.linlin(0,1, 1, 0.9);
		IFFT(PV_MagSmooth(FFT(~fftbufs[i], son), smoothfactor))
		 * ampfactor * AmpCompA.ir(~basefreqs[i], ~basefreqs[3])
	};
	layers.mean.dup
}.play;
)

x.free