_updateResolution( renderTarget, renderer ) {

		const resolution = this.resolution;

		renderer.getDrawingBufferSize( _size$2 );

		renderTarget.setSize( Math.round( _size$2.width * resolution ), Math.round( _size$2.height * resolution ) );

	}
Updates the resolution of the internal render target.

@private
@param {RenderTarget} renderTarget - The render target to resize.
@param {Renderer} renderer - The renderer that is used to determine the new size.