code: function savePackState(gl, options) {
    if (options.colorspaceConversion !== undefined) {
      lastPackState.colorspaceConversion = gl.getParameter(gl.UNPACK_COLORSPACE_CONVERSION_WEBGL);
      gl.pixelStorei(gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, options.colorspaceConversion);
    }
    if (options.premultiplyAlpha !== undefined) {
      lastPackState.premultiplyAlpha = gl.getParameter(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL);
      gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, options.premultiplyAlpha);
    }
    if (options.flipY !== undefined) {
      lastPackState.flipY = gl.getParameter(gl.UNPACK_FLIP_Y_WEBGL);
      gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, options.flipY);
    }
  }
docs: Saves any packing state that will be set based on the options.
  @param {module:twgl.TextureOptions} options A TextureOptions object with whatever parameters you want set.
  @param {WebGLRenderingContext} gl the WebGLRenderingContext
  @private