three.js/src/audio/PositionalAudio.js

import { Vector3 } from '../math/Vector3.js';
import { Quaternion } from '../math/Quaternion.js';
import { Audio } from './Audio.js';

const _position = new Vector3();
const _quaternion = new Quaternion();
const _scale = new Vector3();
const _orientation = new Vector3();

class PositionalAudio extends Audio {

	constructor( listener ) {

		super( listener );

		this.panner = this.context.createPanner();
		this.panner.panningModel = 'HRTF';
		this.panner.connect( this.gain );

	}

	getOutput() {

		return this.panner;

	}

	getRefDistance() {

		return this.panner.refDistance;

	}

	setRefDistance( value ) {

		this.panner.refDistance = value;

		return this;

	}

	getRolloffFactor() {

		return this.panner.rolloffFactor;

	}

	setRolloffFactor( value ) {

		this.panner.rolloffFactor = value;

		return this;

	}

	getDistanceModel() {

		return this.panner.distanceModel;

	}

	setDistanceModel( value ) {

		this.panner.distanceModel = value;

		return this;

	}

	getMaxDistance() {

		return this.panner.maxDistance;

	}

	setMaxDistance( value ) {

		this.panner.maxDistance = value;

		return this;

	}

	setDirectionalCone( coneInnerAngle, coneOuterAngle, coneOuterGain ) {

		this.panner.coneInnerAngle = coneInnerAngle;
		this.panner.coneOuterAngle = coneOuterAngle;
		this.panner.coneOuterGain = coneOuterGain;

		return this;

	}

	updateMatrixWorld( force ) {

		super.updateMatrixWorld( force );

		if ( this.hasPlaybackControl === true && this.isPlaying === false ) return;

		this.matrixWorld.decompose( _position, _quaternion, _scale );

		_orientation.set( 0, 0, 1 ).applyQuaternion( _quaternion );

		const panner = this.panner;

		if ( panner.positionX ) {

			// code path for Chrome and Firefox (see #14393)

			const endTime = this.context.currentTime + this.listener.timeDelta;

			panner.positionX.linearRampToValueAtTime( _position.x, endTime );
			panner.positionY.linearRampToValueAtTime( _position.y, endTime );
			panner.positionZ.linearRampToValueAtTime( _position.z, endTime );
			panner.orientationX.linearRampToValueAtTime( _orientation.x, endTime );
			panner.orientationY.linearRampToValueAtTime( _orientation.y, endTime );
			panner.orientationZ.linearRampToValueAtTime( _orientation.z, endTime );

		} else {

			panner.setPosition( _position.x, _position.y, _position.z );
			panner.setOrientation( _orientation.x, _orientation.y, _orientation.z );

		}

	}

}

export { PositionalAudio };