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/**
* @author Mugen87 / http://github.com/Mugen87
*/
import { BufferGeometry } from '../core/BufferGeometry.js';
import { BufferAttribute } from '../core/BufferAttribute.js';
import { LineBasicMaterial } from '../materials/LineBasicMaterial.js';
import { Line } from '../objects/Line.js';
import { _Math } from '../math/Math.js';
function PositionalAudioHelper( audio, range, divisionsInnerAngle, divisionsOuterAngle ) {
this.audio = audio;
this.range = range || 1;
this.divisionsInnerAngle = divisionsInnerAngle || 16;
this.divisionsOuterAngle = divisionsOuterAngle || 2;
var geometry = new BufferGeometry();
var divisions = this.divisionsInnerAngle + this.divisionsOuterAngle * 2;
var positions = new Float32Array( ( divisions * 3 + 3 ) * 3 );
geometry.addAttribute( 'position', new BufferAttribute( positions, 3 ) );
var materialInnerAngle = new LineBasicMaterial( { color: 0x00ff00 } );
var materialOuterAngle = new LineBasicMaterial( { color: 0xffff00 } );
Line.call( this, geometry, [ materialOuterAngle, materialInnerAngle ] );
this.update();
}
PositionalAudioHelper.prototype = Object.create( Line.prototype );
PositionalAudioHelper.prototype.constructor = PositionalAudioHelper;
PositionalAudioHelper.prototype.update = function () {
var audio = this.audio;
var range = this.range;
var divisionsInnerAngle = this.divisionsInnerAngle;
var divisionsOuterAngle = this.divisionsOuterAngle;
var coneInnerAngle = _Math.degToRad( audio.panner.coneInnerAngle );
var coneOuterAngle = _Math.degToRad( audio.panner.coneOuterAngle );
var halfConeInnerAngle = coneInnerAngle / 2;
var halfConeOuterAngle = coneOuterAngle / 2;
var start = 0;
var count = 0;
var i, stride;
var geometry = this.geometry;
var positionAttribute = geometry.attributes.position;
geometry.clearGroups();
//
function generateSegment( from, to, divisions, materialIndex ) {
var step = ( to - from ) / divisions;
positionAttribute.setXYZ( start, 0, 0, 0 );
count ++;
for ( i = from; i < to; i += step ) {
stride = start + count;
positionAttribute.setXYZ( stride, Math.sin( i ) * range, 0, Math.cos( i ) * range );
positionAttribute.setXYZ( stride + 1, Math.sin( Math.min( i + step, to ) ) * range, 0, Math.cos( Math.min( i + step, to ) ) * range );
positionAttribute.setXYZ( stride + 2, 0, 0, 0 );
count += 3;
}
geometry.addGroup( start, count, materialIndex );
start += count;
count = 0;
}
//
generateSegment( - halfConeOuterAngle, - halfConeInnerAngle, divisionsOuterAngle, 0 );
generateSegment( - halfConeInnerAngle, halfConeInnerAngle, divisionsInnerAngle, 1 );
generateSegment( halfConeInnerAngle, halfConeOuterAngle, divisionsOuterAngle, 0 );
//
positionAttribute.needsUpdate = true;
if ( coneInnerAngle === coneOuterAngle ) this.material[ 0 ].visible = false;
};
PositionalAudioHelper.prototype.dispose = function () {
this.geometry.dispose();
this.material[ 0 ].dispose();
this.material[ 1 ].dispose();
};
export { PositionalAudioHelper };
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