fix audio context resuming for browsers with no autoplay policy

script/audio.js

@@ -13,15 +13,8 @@ var AudioEngine = {
         AudioEngine._initAudioContext();
     },
     _initAudioContext: function () {
-        // for legacy browsers
         AudioEngine._audioContext = new (window.AudioContext || window.webkitAudioContext);
-        if (AudioEngine._audioContext.state === 'suspended') {
-            AudioEngine._audioContext.resume().then(function () {
-                AudioEngine._createMasterChannel();
-            });
-        } else {
-            AudioEngine._createMasterChannel();
-        }
+        AudioEngine._createMasterChannel();
     },
     _createMasterChannel: function () {
         // create master
@@ -29,12 +22,6 @@ var AudioEngine = {
         AudioEngine._master.gain.setValueAtTime(1.0, AudioEngine._audioContext.currentTime);
         AudioEngine._master.connect(AudioEngine._audioContext.destination);
     },
-    _canPlayAudio: function () {
-        if (AudioEngine._audioContext.state === 'suspended') {
-            return false;
-        }
-        return true;
-    },
     _getMissingAudioBuffer: function () {
         // plays beeping sound to indicate missing audio
         var buffer = AudioEngine._audioContext.createBuffer(
@@ -50,7 +37,6 @@ var AudioEngine = {
         return buffer;
     },
     _playSound: function (buffer) {
-        if (!AudioEngine._canPlayAudio()) return;
         if (AudioEngine._currentSoundEffectAudio &&
             AudioEngine._currentSoundEffectAudio.source.buffer == buffer) {
             return;
@@ -74,8 +60,6 @@ var AudioEngine = {
         };
     },
     _playBackgroundMusic: function (buffer) {
-        if (!AudioEngine._canPlayAudio()) return;
-
         var source = AudioEngine._audioContext.createBufferSource();
         source.buffer = buffer;
         source.loop = true;
@@ -107,8 +91,6 @@ var AudioEngine = {
         };
     },
     _playEventMusic: function (buffer) {
-        if (!AudioEngine._canPlayAudio()) return;
-
         var source = AudioEngine._audioContext.createBufferSource();
         source.buffer = buffer;
         source.loop = true;
@@ -157,6 +139,14 @@ var AudioEngine = {
         AudioEngine._currentBackgroundMusic.envelope.gain.setValueAtTime(currentBackgroundGainValue, AudioEngine._audioContext.currentTime);
         AudioEngine._currentBackgroundMusic.envelope.gain.linearRampToValueAtTime(1.0, fadeTime);
     },
+    isAudioContextRunning: function () {
+        return AudioEngine._audioContext.state !== 'suspended';
+    },
+    tryResumingAudioContext: function() {
+        if (AudioEngine._audioContext.state === 'suspended') {
+            AudioEngine._audioContext.resume();
+        }
+    },
     playBackgroundMusic: function (src) {
         AudioEngine.loadAudioFile(src)
             .then(function (buffer) {

script/engine.js

@@ -220,6 +220,7 @@
 			Events.init();
 			Room.init();
 
+
 			if(typeof $SM.get('stores.wood') != 'undefined') {
 				Outside.init();
 			}
@@ -230,10 +231,6 @@
 				Ship.init();
 			}
 
-			if(!$SM.get('config.soundOn')){
-				Engine.toggleVolume();
-			}
-
 			if($SM.get('config.lightsOff', true)){
 				Engine.turnLightsOff();
 			}
@@ -242,11 +239,20 @@
 				Engine.triggerHyperMode();
 			}
 
+			if(!AudioEngine.isAudioContextRunning()){
+				Engine.toggleVolume();
+				document.addEventListener('click', Engine.resumeAudioContext);
+			}
+
 			Engine.saveLanguage();
 			Engine.travelTo(Room);
 
 		},
-
+		resumeAudioContext: function () {
+			AudioEngine.tryResumingAudioContext();
+			Engine.toggleVolume();
+			document.removeEventListener('click', Engine.resumeAudioContext);
+		},
 		browserValid: function() {
 			return ( location.search.indexOf( 'ignorebrowser=true' ) >= 0 || ( typeof Storage != 'undefined' && !oldIE ) );
 		},