text: /**
   * @author mrdoob / http://mrdoob.com/
   */
  
  function Layers() {
  
  	this.mask = 1 | 0;
  
  }
  
  Object.assign( Layers.prototype, {
  
  	set: function ( channel ) {
  
  		this.mask = 1 << channel | 0;
  
  	},
  
  	enable: function ( channel ) {
  
  		this.mask |= 1 << channel | 0;
  
  	},
  
  	enableAll: function () {
  
  		this.mask = 0xffffffff | 0;
  
  	},
  
  	toggle: function ( channel ) {
  
  		this.mask ^= 1 << channel | 0;
  
  	},
  
  	disable: function ( channel ) {
  
  		this.mask &= ~ ( 1 << channel | 0 );
  
  	},
  
  	disableAll: function () {
  
  		this.mask = 0;
  
  	},
  
  	test: function ( layers ) {
  
  		return ( this.mask & layers.mask ) !== 0;
  
  	}
  
  } );
  
  
  export { Layers };
  