import Tone from "../core/Tone";
import "../signal/WaveShaper";

/**
 *  @class Convert an incoming signal between 0, 1 to an equal power gain scale.
 *
 *  @extends {Tone.SignalBase}
 *  @constructor
 *  @example
 * var eqPowGain = new Tone.EqualPowerGain();
 */
Tone.EqualPowerGain = function(){

	Tone.SignalBase.call(this);
	/**
	 *  @type {Tone.WaveShaper}
	 *  @private
	 */
	this._eqPower = this.input = this.output = new Tone.WaveShaper(function(val){
		if (Math.abs(val) < 0.001){
			//should output 0 when input is 0
			return 0;
		} else {
			return Tone.equalPowerScale(val);
		}
	}.bind(this), 4096);
};

Tone.extend(Tone.EqualPowerGain, Tone.SignalBase);

/**
 *  clean up
 *  @returns {Tone.EqualPowerGain} this
 */
Tone.EqualPowerGain.prototype.dispose = function(){
	Tone.SignalBase.prototype.dispose.call(this);
	this._eqPower.dispose();
	this._eqPower = null;
	return this;
};

export default Tone.EqualPowerGain;