75 lines
2.5 KiB
JavaScript
75 lines
2.5 KiB
JavaScript
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/**
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* A sound effect which applies a biquad filter.
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* @see {@link https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode}
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* @alias foundry.audio.BiquadFilterEffect
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*/
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export default class BiquadFilterEffect extends BiquadFilterNode {
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/**
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* A ConvolverEffect is constructed by passing the following parameters.
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* @param {AudioContext} context The audio context required by the BiquadFilterNode
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* @param {object} [options] Additional options which modify the BiquadFilterEffect behavior
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* @param {BiquadFilterType} [options.type=lowpass] The filter type to apply
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* @param {number} [options.intensity=5] The initial intensity of the effect
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*/
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constructor(context, {type="lowpass", intensity=5, ...options}={}) {
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if ( !BiquadFilterEffect.#ALLOWED_TYPES.includes(type) ) {
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throw new Error(`Invalid BiquadFilterEffect type "${type}" provided`);
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}
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super(context, options);
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this.#type = this.type = type;
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this.#intensity = intensity;
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this.update();
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}
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/**
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* The allowed filter types supported by this effect class.
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*/
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static #ALLOWED_TYPES = ["lowpass", "highpass", "bandpass", "lowshelf", "highshelf", "peaking", "notch"];
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/**
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* The original configured type of the effect.
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* @type {BiquadFilterType}
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*/
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#type;
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/* -------------------------------------------- */
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/**
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* Adjust the intensity of the effect on a scale of 0 to 10.
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* @type {number}
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*/
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get intensity() {
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return this.#intensity;
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}
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set intensity(intensity) {
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this.update({intensity});
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}
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#intensity;
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/* -------------------------------------------- */
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/**
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* Update the state of the effect node given the active flag and numeric intensity.
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* @param {object} options Options which are updated
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* @param {number} [options.intensity] A new effect intensity
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* @param {BiquadFilterType} [options.type] A new filter type
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*/
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update({intensity, type} = {}) {
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if ( Number.isFinite(intensity) ) this.#intensity = Math.clamp(intensity, 1, 10);
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if ( BiquadFilterEffect.#ALLOWED_TYPES.includes(type) ) this.#type = type;
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this.type = this.#type;
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switch ( this.#type ) {
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case "lowpass":
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this.frequency.value = 1100 - (100 * this.#intensity); // More intensity cuts at a lower frequency
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break;
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case "highpass":
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this.frequency.value = 100 * this.#intensity; // More intensity cuts at higher frequency
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break;
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default:
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throw new Error(`BiquadFilterEffect type "${this.#type}" not yet configured`);
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}
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}
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}
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