function getCubeFaceOrder(gl, options) {
    options = options || {};
    return options.cubeFaceOrder || [
        gl.TEXTURE_CUBE_MAP_POSITIVE_X,
        gl.TEXTURE_CUBE_MAP_NEGATIVE_X,
        gl.TEXTURE_CUBE_MAP_POSITIVE_Y,
        gl.TEXTURE_CUBE_MAP_NEGATIVE_Y,
        gl.TEXTURE_CUBE_MAP_POSITIVE_Z,
        gl.TEXTURE_CUBE_MAP_NEGATIVE_Z,
      ];
  }
Gets an array of cubemap face enums
@param {WebGLRenderingContext} gl the WebGLRenderingContext
@param {module:twgl.TextureOptions} options A TextureOptions object with whatever parameters you want set.
  This is often the same options you passed in when you created the texture.
@return {number[]} cubemap face enums