mirror of
https://github.com/Tonejs/Tone.js
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111 lines
No EOL
3.3 KiB
JavaScript
111 lines
No EOL
3.3 KiB
JavaScript
define(["Tone/core/Tone", "Tone/signal/SignalBase"], function(Tone){
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"use strict";
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/**
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* @class Wraps the WaveShaperNode
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*
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* ```javascript
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* var timesTwo = new Tone.WaveShaper(function(val){
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* return val * 2;
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* }, 2048);
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* ```
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*
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* @extends {Tone.SignalBase}
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* @constructor
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* @param {function(number, number)|Array|number} mapping the function used to define the values.
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* The mapping function should take two arguments:
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* the first is the value at the current position
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* and the second is the array position.
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* If the argument is an array, that array will be
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* set as the wave shapping function
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* @param {number} [bufferLen=1024] the length of the WaveShaperNode buffer.
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*/
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Tone.WaveShaper = function(mapping, bufferLen){
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/**
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* the waveshaper
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* @type {WaveShaperNode}
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* @private
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*/
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this._shaper = this.input = this.output = this.context.createWaveShaper();
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/**
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* the waveshapers curve
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* @type {Float32Array}
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* @private
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*/
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this._curve = null;
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if (Array.isArray(mapping)){
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this.setCurve(mapping);
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} else if (isFinite(mapping) || this.isUndef(mapping)){
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this._curve = new Float32Array(this.defaultArg(mapping, 1024));
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} else if (typeof mapping === "function"){
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this._curve = new Float32Array(this.defaultArg(bufferLen, 1024));
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this.setMap(mapping);
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}
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};
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Tone.extend(Tone.WaveShaper, Tone.SignalBase);
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/**
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* uses a mapping function to set the value of the curve
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* @param {function(number, number)} mapping the function used to define the values.
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* The mapping function should take two arguments:
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* the first is the value at the current position
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* and the second is the array position
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*/
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Tone.WaveShaper.prototype.setMap = function(mapping){
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for (var i = 0, len = this._curve.length; i < len; i++){
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var normalized = (i / (len)) * 2 - 1;
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var normOffOne = (i / (len - 1)) * 2 - 1;
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this._curve[i] = mapping(normalized, i, normOffOne);
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}
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this._shaper.curve = this._curve;
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};
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/**
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* use an array to set the waveshaper curve
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* @param {Array} mapping the array to use as the waveshaper
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*/
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Tone.WaveShaper.prototype.setCurve = function(mapping){
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//fixes safari WaveShaperNode bug
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if (this._isSafari()){
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var first = mapping[0];
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mapping.unshift(first);
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}
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this._curve = new Float32Array(mapping);
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this._shaper.curve = this._curve;
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};
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/**
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* set the oversampling
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* @param {string} oversampling can either be "none", "2x" or "4x"
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*/
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Tone.WaveShaper.prototype.setOversample = function(oversampling) {
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this._shaper.oversample = oversampling;
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};
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/**
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* returns true if the browser is safari
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* @return {boolean}
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* @private
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*/
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Tone.WaveShaper.prototype._isSafari = function(){
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var ua = navigator.userAgent.toLowerCase();
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return ua.indexOf("safari") !== -1 && ua.indexOf("chrome") === -1;
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};
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/**
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* clean up
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*/
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Tone.WaveShaper.prototype.dispose = function(){
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Tone.prototype.dispose.call(this);
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this._shaper.disconnect();
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this._shaper = null;
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this._curve = null;
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};
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return Tone.WaveShaper;
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}); |