add global sound volume

kriswep · Apr 23, 2017 · c0c35af · c0c35af
1 parent 554e067
commit c0c35af
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Showing 2 changed files with 18 additions and 4 deletions.
diff --git a/src/sound.js b/src/sound.js
@@ -1,9 +1,13 @@
-/* globals window AudioContext */
+/* globals window AudioContext localStorage */
 const sound = {
   aCtx: undefined,
   init() {
     window.AudioContext = window.AudioContext || window.webkitAudioContext;
     this.aCtx = new AudioContext();
+
+    this.mainGain = this.aCtx.createGain();
+    this.mainGain.gain.value = localStorage.getItem('sound') || 0.8;
+    this.mainGain.connect(this.aCtx.destination);
   },
   noiseBuffer() {
     const bufferSize = this.aCtx.sampleRate;
@@ -20,13 +24,14 @@ const sound = {
     if (!this.aCtx) {
       this.init();
     }
+
     const time = sound.aCtx.currentTime;
     const noise = this.aCtx.createBufferSource();
     const noiseEnvelope = this.aCtx.createGain();
 
     noise.buffer = this.noiseBuffer();
     noise.connect(noiseEnvelope);
-    noiseEnvelope.connect(this.aCtx.destination);
+    noiseEnvelope.connect(this.mainGain);
 
     noiseEnvelope.gain.setValueAtTime(1, time);
     noiseEnvelope.gain.exponentialRampToValueAtTime(0.01, time + 0.2);

diff --git a/src/sound.spec.js b/src/sound.spec.js
@@ -4,15 +4,23 @@ import 'web-audio-mock';
 import sound from './sound';
 
 
+// small localStorage mock
+global.localStorage = {
+  getItem: jest.fn()
+    .mockImplementationOnce(() => null)
+    .mockImplementation(() => 1),
+};
+
 test('Sound should have a init function which inits audioContext', () => {
   // mock window.webkitAudioContext, window.AudioConext is mocked through import above
   window.webkitAudioContext = window.AudioContext;
   window.AudioContext = undefined;
   expect(sound.aCtx).not.toBeDefined();
   expect(sound.init).toBeDefined();
   expect(sound.init.bind(sound)).not.toThrow();
-  // sound.init();
   expect(sound.aCtx).toBeDefined();
+  expect(sound.mainGain).toBeDefined();
+  expect(sound.mainGain.gain.value).toBe(0.8);
 
   // remock window.AudioContext
   window.AudioContext = window.webkitAudioContext;
@@ -21,8 +29,9 @@ test('Sound should have a init function which inits audioContext', () => {
   expect(sound.aCtx).not.toBeDefined();
   expect(sound.init).toBeDefined();
   expect(sound.init.bind(sound)).not.toThrow();
-  // sound.init();
   expect(sound.aCtx).toBeDefined();
+  expect(sound.mainGain).toBeDefined();
+  expect(sound.mainGain.gain.value).toBe(1);
 });
 
 test('Sound should have a playPlop function', () => {