text: import { Vector3 } from '../math/Vector3.js';
  import { BufferAttribute } from './BufferAttribute.js';
  
  const _vector = new Vector3();
  
  function InterleavedBufferAttribute( interleavedBuffer, itemSize, offset, normalized ) {
  
  	this.name = '';
  
  	this.data = interleavedBuffer;
  	this.itemSize = itemSize;
  	this.offset = offset;
  
  	this.normalized = normalized === true;
  
  }
  
  Object.defineProperties( InterleavedBufferAttribute.prototype, {
  
  	count: {
  
  		get: function () {
  
  			return this.data.count;
  
  		}
  
  	},
  
  	array: {
  
  		get: function () {
  
  			return this.data.array;
  
  		}
  
  	},
  
  	needsUpdate: {
  
  		set: function ( value ) {
  
  			this.data.needsUpdate = value;
  
  		}
  
  	}
  
  } );
  
  Object.assign( InterleavedBufferAttribute.prototype, {
  
  	isInterleavedBufferAttribute: true,
  
  	applyMatrix4: function ( m ) {
  
  		for ( let i = 0, l = this.data.count; i < l; i ++ ) {
  
  			_vector.x = this.getX( i );
  			_vector.y = this.getY( i );
  			_vector.z = this.getZ( i );
  
  			_vector.applyMatrix4( m );
  
  			this.setXYZ( i, _vector.x, _vector.y, _vector.z );
  
  		}
  
  		return this;
  
  	},
  
  	setX: function ( index, x ) {
  
  		this.data.array[ index * this.data.stride + this.offset ] = x;
  
  		return this;
  
  	},
  
  	setY: function ( index, y ) {
  
  		this.data.array[ index * this.data.stride + this.offset + 1 ] = y;
  
  		return this;
  
  	},
  
  	setZ: function ( index, z ) {
  
  		this.data.array[ index * this.data.stride + this.offset + 2 ] = z;
  
  		return this;
  
  	},
  
  	setW: function ( index, w ) {
  
  		this.data.array[ index * this.data.stride + this.offset + 3 ] = w;
  
  		return this;
  
  	},
  
  	getX: function ( index ) {
  
  		return this.data.array[ index * this.data.stride + this.offset ];
  
  	},
  
  	getY: function ( index ) {
  
  		return this.data.array[ index * this.data.stride + this.offset + 1 ];
  
  	},
  
  	getZ: function ( index ) {
  
  		return this.data.array[ index * this.data.stride + this.offset + 2 ];
  
  	},
  
  	getW: function ( index ) {
  
  		return this.data.array[ index * this.data.stride + this.offset + 3 ];
  
  	},
  
  	setXY: function ( index, x, y ) {
  
  		index = index * this.data.stride + this.offset;
  
  		this.data.array[ index + 0 ] = x;
  		this.data.array[ index + 1 ] = y;
  
  		return this;
  
  	},
  
  	setXYZ: function ( index, x, y, z ) {
  
  		index = index * this.data.stride + this.offset;
  
  		this.data.array[ index + 0 ] = x;
  		this.data.array[ index + 1 ] = y;
  		this.data.array[ index + 2 ] = z;
  
  		return this;
  
  	},
  
  	setXYZW: function ( index, x, y, z, w ) {
  
  		index = index * this.data.stride + this.offset;
  
  		this.data.array[ index + 0 ] = x;
  		this.data.array[ index + 1 ] = y;
  		this.data.array[ index + 2 ] = z;
  		this.data.array[ index + 3 ] = w;
  
  		return this;
  
  	},
  
  	clone: function ( data ) {
  
  		if ( data === undefined ) {
  
  			console.log( 'THREE.InterleavedBufferAttribute.clone(): Cloning an interlaved buffer attribute will deinterleave buffer data.' );
  
  			const array = [];
  
  			for ( let i = 0; i < this.count; i ++ ) {
  
  				const index = i * this.data.stride + this.offset;
  
  				for ( let j = 0; j < this.itemSize; j ++ ) {
  
  					array.push( this.data.array[ index + j ] );
  
  				}
  
  			}
  
  			return new BufferAttribute( new this.array.constructor( array ), this.itemSize, this.normalized );
  
  		} else {
  
  			if ( data.interleavedBuffers === undefined ) {
  
  				data.interleavedBuffers = {};
  
  			}
  
  			if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {
  
  				data.interleavedBuffers[ this.data.uuid ] = this.data.clone( data );
  
  			}
  
  			return new InterleavedBufferAttribute( data.interleavedBuffers[ this.data.uuid ], this.itemSize, this.offset, this.normalized );
  
  		}
  
  	},
  
  	toJSON: function ( data ) {
  
  		if ( data === undefined ) {
  
  			console.log( 'THREE.InterleavedBufferAttribute.toJSON(): Serializing an interlaved buffer attribute will deinterleave buffer data.' );
  
  			const array = [];
  
  			for ( let i = 0; i < this.count; i ++ ) {
  
  				const index = i * this.data.stride + this.offset;
  
  				for ( let j = 0; j < this.itemSize; j ++ ) {
  
  					array.push( this.data.array[ index + j ] );
  
  				}
  
  			}
  
  			// deinterleave data and save it as an ordinary buffer attribute for now
  
  			return {
  				itemSize: this.itemSize,
  				type: this.array.constructor.name,
  				array: array,
  				normalized: this.normalized
  			};
  
  		} else {
  
  			// save as true interlaved attribtue
  
  			if ( data.interleavedBuffers === undefined ) {
  
  				data.interleavedBuffers = {};
  
  			}
  
  			if ( data.interleavedBuffers[ this.data.uuid ] === undefined ) {
  
  				data.interleavedBuffers[ this.data.uuid ] = this.data.toJSON( data );
  
  			}
  
  			return {
  				isInterleavedBufferAttribute: true,
  				itemSize: this.itemSize,
  				data: this.data.uuid,
  				offset: this.offset,
  				normalized: this.normalized
  			};
  
  		}
  
  	}
  
  } );
  
  
  export { InterleavedBufferAttribute };
  