From a6dc9f4f43d796ab790d77540f8fafe94bd866c3 Mon Sep 17 00:00:00 2001
From: Bruce <bruce@batchass.fr>
Date: Sun, 20 Oct 2019 16:14:53 +0200
Subject: [PATCH] added MidiManager

---
 hydra/app/extensions/hydra-midi/index.js | 37 ++++++++++++++++++++++++
 hydra/app/startup-pixels.js              |  4 +++
 2 files changed, 41 insertions(+)
 create mode 100644 hydra/app/extensions/hydra-midi/index.js

diff --git a/hydra/app/extensions/hydra-midi/index.js b/hydra/app/extensions/hydra-midi/index.js
new file mode 100644
index 00000000..a55a72b8
--- /dev/null
+++ b/hydra/app/extensions/hydra-midi/index.js
@@ -0,0 +1,37 @@
+
+
+class Midi {
+  constructor() {
+    console.log('midi ctor');
+    this.onMIDISuccess = this.onMIDISuccess.bind(this)
+    this.getMIDIMessage = this.getMIDIMessage.bind(this)
+
+    navigator.requestMIDIAccess().then(this.onMIDISuccess, this.onMIDIFailure);
+    //create an array to hold our cc values and init to a normalized value
+    this.cc = Array(128).fill(0.5);
+  };
+    
+ onMIDISuccess(midiAccess) {
+    console.log(midiAccess);
+    var inputs = midiAccess.inputs;
+    var outputs = midiAccess.outputs;
+    for (var input of midiAccess.inputs.values()) {
+      input.onmidimessage = this.getMIDIMessage;
+    }
+  }
+  onMIDIFailure() {
+    console.log('Could not access your MIDI devices.');
+  }
+
+  getMIDIMessage(midiMessage) {
+    var arr = midiMessage.data
+    var index = arr[1]
+    console.log('Midi received on cc#' + index + ' value:' + arr[2])
+    var val = (arr[2] + 1) / 128.0  // normalize CC values to 0.0 - 1.0
+    this.cc[index] = val
+  }
+}
+
+module.exports = Midi
+
+
diff --git a/hydra/app/startup-pixels.js b/hydra/app/startup-pixels.js
index a5d0643f..7d7b83c5 100644
--- a/hydra/app/startup-pixels.js
+++ b/hydra/app/startup-pixels.js
@@ -8,6 +8,7 @@ const Editor = require('./core/hydra-editor')
 // Extensions
 const PixelSynth = require('./extensions/hydra-pixels')
 const OscManager = require('./extensions/hydra-osc')
+const MidiManager = require('./extensions/hydra-midi')
 
 function init () {
   // init hydra
@@ -20,6 +21,9 @@ function init () {
   window.pixels = new PixelSynth({ gl: hydra.regl._gl, parent: document.body})
   window.msg = new OscManager()
 
+  // use like: osc( () => midi.cc[18]  ).out()
+  window.midi = new MidiManager()
+  
   editor = new Editor({ loadFromStorage: true})
 
 // loop function run on each frame