mirror of
https://github.com/doublespeakgames/adarkroom.git
synced 2026-05-28 08:11:54 +08:00
connect majority actions to sound effects;add more placeholder loops and effects
This commit is contained in:
jorsi
+97
-38
@@ -2,30 +2,28 @@
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* Module that takes care of audio playback
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*/
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var AudioEngine = {
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canPlayAudio: false,
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FADE_TIME: 1,
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AUDIO_BUFFER_CACHE: {},
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audioContext: null,
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master: null,
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// Tracks for playing music and sound effects
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// 0 - Background music
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// 1 - Background music
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// 2 - Event music
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// 3 - Sound effects
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tracks: null,
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currentBackgroundChannel: 0,
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currentTrack: null,
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tracks: {
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'bg1': null,
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'bg2': null,
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'events': null,
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'sfx': null
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},
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currentBackgroundChannel: 'bg1',
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currentBackgroundAudio: null,
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currentEventAudio: null,
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init: function(options) {
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// for legacy browsers
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AudioEngine.audioContext = new (window.AudioContext || window.webkitAudioContext);
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audioLog('starting audio engine');
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console.log(AudioEngine.audioContext);
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audioLog('state: ' + AudioEngine.audioContext.state);
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if (AudioEngine.audioContext.state === 'suspended') {
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AudioEngine.audioContext.resume().then(function () {
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AudioEngine.createChannels();
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AudioEngine.canPlayAudio = true;
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});
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} else {
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AudioEngine.createChannels();
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@@ -34,72 +32,133 @@ var AudioEngine = {
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createChannels() {
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// create master
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AudioEngine.master = AudioEngine.audioContext.createGain();
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AudioEngine.master.gain.setValueAtTime(1.0, AudioEngine.audioContext.currentTime);
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AudioEngine.master.connect(AudioEngine.audioContext.destination);
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// create 4 tracks to output to master
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AudioEngine.tracks = [];
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for (var i = 0; i < 4; i++) {
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AudioEngine.tracks[i] = AudioEngine.audioContext.createGain();
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AudioEngine.tracks[i].connect(AudioEngine.master);
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}
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AudioEngine.tracks['bg1'] = AudioEngine.audioContext.createGain();
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AudioEngine.tracks['bg1'].connect(AudioEngine.master);
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AudioEngine.tracks['bg1'].gain.setValueAtTime(1.0, AudioEngine.audioContext.currentTime);
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AudioEngine.tracks['bg2'] = AudioEngine.audioContext.createGain();
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AudioEngine.tracks['bg2'].connect(AudioEngine.master);
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AudioEngine.tracks['bg2'].gain.setValueAtTime(1.0, AudioEngine.audioContext.currentTime);
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AudioEngine.tracks['events'] = AudioEngine.audioContext.createGain();
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AudioEngine.tracks['events'].connect(AudioEngine.master);
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AudioEngine.tracks['events'].gain.setValueAtTime(1.0, AudioEngine.audioContext.currentTime);
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AudioEngine.tracks['sfx'] = AudioEngine.audioContext.createGain();
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AudioEngine.tracks['sfx'].connect(AudioEngine.master);
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AudioEngine.tracks['sfx'].gain.setValueAtTime(1.0, AudioEngine.audioContext.currentTime);
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},
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options: {}, // Nothing for now,
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_canPlayAudio: function() {
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if (AudioEngine.audioContext.state === 'suspended') {
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audioLog('can\'t play audio');
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return false;
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}
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return true;
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},
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options: {}, // Nothing for now
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_playSound: function(buffer) {
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if (!AudioEngine.canPlayAudio) return;
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if (!AudioEngine._canPlayAudio()) return;
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var source = AudioEngine.audioContext.createBufferSource();
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source.buffer = buffer;
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source.connect(AudioEngine.tracks[1]);
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source.connect(AudioEngine.tracks['sfx']);
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source.start(AudioEngine.audioContext.currentTime);
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},
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_fadeTrack: function(buffer) {
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if (!AudioEngine.canPlayAudio) return;
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if (!AudioEngine._canPlayAudio()) return;
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var newTrack = AudioEngine.audioContext.createBufferSource();
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newTrack.buffer = buffer;
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newTrack.loop = true;
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audioLog('_fadeMusic');
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console.log(buffer);
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var bufferSource = AudioEngine.audioContext.createBufferSource();
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bufferSource.buffer = buffer;
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bufferSource.loop = true;
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// figure out which background track to start on
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// in order to do crossfade
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var nextBackgroundChannel;
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if (AudioEngine.currentBackgroundChannel === 0) {
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nextBackgroundChannel = 1;
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if (AudioEngine.currentBackgroundChannel === 'bg1') {
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nextBackgroundChannel = 'bg2';
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} else {
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nextBackgroundChannel = 0;
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nextBackgroundChannel = 'bg1';
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}
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// fade in new track
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var fadeTime = AudioEngine.audioContext.currentTime + 2.0;
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newTrack.connect(AudioEngine.tracks[nextBackgroundChannel]);
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newTrack.start(0);
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var fadeTime = AudioEngine.audioContext.currentTime + AudioEngine.FADE_TIME;
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bufferSource.connect(AudioEngine.tracks[nextBackgroundChannel]);
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bufferSource.start(AudioEngine.audioContext.currentTime);
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AudioEngine.tracks[nextBackgroundChannel].gain.setValueAtTime(0.0, AudioEngine.audioContext.currentTime);
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AudioEngine.tracks[nextBackgroundChannel].gain.linearRampToValueAtTime(.1, fadeTime);
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AudioEngine.tracks[nextBackgroundChannel].gain.linearRampToValueAtTime(1.0, fadeTime);
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// fade out old track
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AudioEngine.tracks[AudioEngine.currentBackgroundChannel].gain.linearRampToValueAtTime(0.0, fadeTime);
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if (AudioEngine.currentTrack) {
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AudioEngine.currentTrack.stop(fadeTime + 0.3); // make sure fade has completed
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if (AudioEngine.currentBackgroundAudio) {
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AudioEngine.currentBackgroundAudio.stop(fadeTime + 0.3); // make sure fade has completed
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}
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// switch background track
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AudioEngine.currentBackgroundChannel = nextBackgroundChannel;
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AudioEngine.currentTrack = newTrack;
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AudioEngine.currentBackgroundAudio = bufferSource;
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},
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_playEvent: function(buffer) {
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if (!AudioEngine._canPlayAudio()) return;
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var bufferSource = AudioEngine.audioContext.createBufferSource();
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bufferSource.buffer = buffer;
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bufferSource.loop = true;
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var fadeTime = AudioEngine.audioContext.currentTime + AudioEngine.FADE_TIME * 2;
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// turn down background music
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AudioEngine.tracks['bg1'].gain.linearRampToValueAtTime(0.2, fadeTime);
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AudioEngine.tracks['bg2'].gain.linearRampToValueAtTime(0.2, fadeTime);
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// fade in event music
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bufferSource.connect(AudioEngine.tracks['events']);
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bufferSource.start(0);
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AudioEngine.currentEventAudio = bufferSource;
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AudioEngine.tracks['events'].gain.setValueAtTime(0.0, AudioEngine.audioContext.currentTime);
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AudioEngine.tracks['events'].gain.linearRampToValueAtTime(1.0, fadeTime);
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},
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_stopEventMusic: function() {
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var fadeTime = AudioEngine.audioContext.currentTime + AudioEngine.FADE_TIME * 2;
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// fade out event music and stop
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AudioEngine.tracks['events'].gain.linearRampToValueAtTime(0.0, fadeTime);
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if (AudioEngine.currentEventAudio) {
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AudioEngine.currentEventAudio.stop(fadeTime + 1); // make sure fade has completed
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AudioEngine.currentEventAudio = null;
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}
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// turn up background music
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AudioEngine.tracks[AudioEngine.currentBackgroundChannel].gain.linearRampToValueAtTime(1.0, fadeTime);
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},
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changeMusic: function(src) {
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AudioEngine.loadAudioFile(src)
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.then(function (buffer) {
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audioLog('changeMusic: ' + src);
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AudioEngine._fadeTrack(buffer);
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});
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audioLog('change music: ' + src);
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audioLog('audio engine status: ' + AudioEngine.audioContext.state);
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},
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playEventMusic: function(src) {
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AudioEngine.loadAudioFile(src)
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.then(function (buffer) {
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audioLog('playEventMusic: ' + src);
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AudioEngine._playEvent(buffer);
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});
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},
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stopEventMusic: function() {
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audioLog('stopEventMusic');
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AudioEngine._stopEventMusic();
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},
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playSound: function(src) {
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AudioEngine.loadAudioFile(src)
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.then(function (buffer) {
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audioLog('playSound: ' + src);
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AudioEngine._playSound(buffer);
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});
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audioLog('play sound: ' + src);
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audioLog('audio engine status: ' + AudioEngine.audioContext.state);
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},
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loadAudioFile(src) {
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if (AudioEngine.AUDIO_BUFFER_CACHE[src]) {
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