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optimizing modulo operator

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This commit is contained in:
Yotam Mann 2014-09-12 00:55:10 -04:00
parent f511f18ade
commit 5b178359fd
1 changed files with 48 additions and 37 deletions
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85
Tone/signal/Modulo.js
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@ -1,4 +1,4 @@
define(["Tone/core/Tone", "Tone/signal/LessThan", "Tone/signal/Select", "Tone/signal/Not"], function(Tone){
define(["Tone/core/Tone", "Tone/signal/Multiply"], function(Tone){
"use strict";
@ -18,7 +18,7 @@ define(["Tone/core/Tone", "Tone/signal/LessThan", "Tone/signal/Select", "Tone/si
Tone.call(this);
bits = this.defaultArg(bits, 4);
bits = this.defaultArg(bits, 8);
/**
* the array of Modulus Subroutine objects
@ -32,11 +32,9 @@ define(["Tone/core/Tone", "Tone/signal/LessThan", "Tone/signal/Select", "Tone/si
var mod = new ModuloSubroutine(modulus, Math.pow(2, i));
this._modChain.push(mod);
}
//connect them up
this.input.connect(this._modChain[0]);
this.chain.apply(this, this._modChain);
this._modChain[bits - 1].connect(this.output);
this.input.connect(this._modChain[0]);
this._modChain[this._modChain.length - 1].connect(this.output);
};
Tone.extend(Tone.Modulo);
@ -62,55 +60,68 @@ define(["Tone/core/Tone", "Tone/signal/LessThan", "Tone/signal/Select", "Tone/si
var ModuloSubroutine = function(modulus, multiple){
Tone.call(this);
var val = modulus * multiple;
/**
* @type {Tone.LessThan}
* divide the incoming signal so it's on a 0 to 1 scale
* @type {Tone.Multiply}
* @private
*/
this._lt = new Tone.LessThan(val);
this._div = new Tone.Multiply(1 / val);
/**
* apply the equation logic
* @type {WaveShaperNode}
* @private
* @type {Tone.Not}
*/
this._not = new Tone.Not();
this._operator = this.context.createWaveShaper();
/**
* @private
* @type {Tone.Add}
*/
this._sub = new Tone.Add(-val);
/**
* @private
* @type {Tone.Select}
*/
this._select = new Tone.Select(2);
//connections
this.chain(this.input, this._lt, this._not, this._select.gate);
this.input.connect(this._sub);
this._sub.connect(this._select, 0, 1);
this.input.connect(this._select, 0, 0);
this._select.connect(this.output);
//connect it up
this.chain(this.input, this._div, this._operator, this.output);
this._makeCurve(val);
};
Tone.extend(ModuloSubroutine);
/**
* make the operator curve
* @param {number} val
* @private
*/
ModuloSubroutine.prototype._makeCurve = function(val){
var arrayLength = Math.pow(2, 24);
var curve = new Float32Array(arrayLength);
for (var i = 0; i < curve.length; i++) {
if (i === arrayLength - 1){
curve[i] = -val;
} else if (i === 0){
curve[i] = val;
} else {
curve[i] = 0;
}
}
this._operator.curve = curve;
};
/**
* @override the default connection to connect the operator and the input to the next node
* @private
*/
ModuloSubroutine.prototype.connect = function(node){
this._operator.connect(node);
this.input.connect(node);
};
/**
* internal class clean up
*/
ModuloSubroutine.prototype.dispose = function(){
this._lt.dispose();
this._not.dispose();
this._sub.dispose();
this._select.dispose();
this._lt = null;
this._not = null;
this._sub = null;
this._select = null;
Tone.prototype.dispose.call(this);
this._div.dispose();
this._operator.disconnect();
this._div = null;
this._operator = null;
};
return Tone.Modulo;