(go
      (let [chans
            (sequence brushes (comp
                               (map
                                (fn [[name brush]]
                                  (if (:texture brush)
                                    (load-texture (:texture brush)))))
                               (filter identity)))
            textures (<! (async/into [] chans))]
        {:gl gl
         :driver driver
         :programs programs
         :pers pers
         :textures textures}))