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|
(ns unheard.theory
(:require [missionary.core :as m]
[unheard.time-object :refer
[time-object lift phrase timeline point-query]]
[clojure.set :refer [union]]
[unheard.util.missionary :refer [reconcile-merge]]))
(defn note
[>clock start duration >value]
(lift (time-object start
duration
(m/stream
(m/ap
(let [[c v] (m/?> (m/relieve
(m/latest vector >clock >value)))]
v))))))
;; BUG: 2d7f861
(defn read
[>clock timeline]
(m/relieve
(m/reductions {} nil
(m/eduction (map vals)
(m/reductions
(fn [acc {:keys [id state value]}]
(if (= :up state)
(assoc acc id value)
(dissoc acc id)))
{}
(reconcile-merge (point-query timeline >clock)))))))
(comment
(def c (atom 0))
(def >c (m/signal (m/watch c)))
(def v (atom 0))
(def >v (m/signal (m/watch v)))
(def song (phrase (note >c 4 8 >v) (note >c 6 6 >v)))
(def t (timeline song))
(def cancel ((m/reduce prn nil (read >c t)) prn prn))
(cancel)
(swap! c dec)
(swap! c inc)
(swap! v inc)
(swap! v dec))
(defn poly
[& notes]
(m/signal (m/cp (apply union (m/?< (apply m/latest vector notes))))))
;; TODO: Group could actually wrap note, rather than using explicitly
;; WIll introduce a lot of GC churn, though
(defn group
[clock start end content]
(m/cp (let [content (m/signal content)]
(if (m/?< (m/latest #(<= start % end) clock))
(m/?< content)
(m/amb #{})))))
;; TODO:
;; - Note literals turn into numbers
;; - Represent keyboard as byte array of shorts
;; - play a note increments, stop a note decrements
;; - Multiple instruments
;; - Mapping inputs to vars
;; - Inputs get declared at the top of a track
;; - Devices get mapped to declared inputs
;; - Notion of scenes that change mapping of inputs to vars
;; - Loops
|
