code: function filterFallback ( f ) {
  
  		switch ( f ) {
  
  			case THREE.NearestFilter:
  			case THREE.NearestMipMapNearestFilter:
  			case THREE.NearestMipMapLinearFilter: return _gl.NEAREST; break;
  
  			case THREE.LinearFilter:
  			case THREE.LinearMipMapNearestFilter:
  			case THREE.LinearMipMapLinearFilter:
  			default:
  
  				return _gl.LINEAR; break;
  
  		}
  
  	}
docs: Fallback filters for non-power-of-2 textures