this.setSize = function ( width, height, updateStyle ) {

		_canvas.width = width * this.devicePixelRatio;
		_canvas.height = height * this.devicePixelRatio;

		if ( this.devicePixelRatio !== 1 && updateStyle !== false ) {

			_canvas.style.width = width + 'px';
			_canvas.style.height = height + 'px';

		}

		this.setViewport( 0, 0, width, height );

	};

	this.setViewport = function ( x, y, width, height ) {

		_viewportX = x * this.devicePixelRatio;
		_viewportY = y * this.devicePixelRatio;

		_viewportWidth = width * this.devicePixelRatio;
		_viewportHeight = height * this.devicePixelRatio;

		_gl.viewport( _viewportX, _viewportY, _viewportWidth, _viewportHeight );

	};