59 lines
1.5 KiB
JavaScript
59 lines
1.5 KiB
JavaScript
// audio for events
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// AUDIO SETUP
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let audioEngine = new(window.AudioContext || window.webkitAudioContext)()
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let masterGain = audioEngine.createGain()
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let voice = {
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gain: audioEngine.createGain(),
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osc: audioEngine.createOscillator(),
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adsr: {
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a: typeof amount === 'number' ? amount * 1000 : 0.025,
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d: typeof amount === 'number' ? amount * 1000 : 0.5,
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sv: typeof amount === 'number' ? amount : 0.8,
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r: typeof amount === 'number' ? amount * 1000 : 0.5,
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t: audioEngine.currentTime
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},
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play: function(note) {
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freq = typeof note === 'number' ? note : (Math.random() * 350) + 50
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this.osc.frequency.setValueAtTime(freq, audioEngine.currentTime)
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this.engage()
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},
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engage: function() {
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// clear preScheduled events
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this.gain.gain.cancelScheduledValues(this.adsr.t)
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// initial value
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this.gain.gain.setValueAtTime(0.0, this.adsr.t)
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// attack
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this.gain.gain.setTargetAtTime(0.9, this.adsr.t, this.adsr.a)
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// decay
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this.gain.gain.setTargetAtTime(this.adsr.sv, this.adsr.t + this.adsr.a, this.adsr.d)
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},
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release: function() {
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this.adsr.t = audioEngine.currentTime
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// release
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this.gain.gain.setTargetAtTime(0.0, this.adsr.t, this.adsr.r)
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}
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}
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window.onload = function() {
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// create gain
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voice.gain.gain.setValueAtTime(0.0001, audioEngine.currentTime)
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masterGain.gain.value = 0.9
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voice.gain.connect(masterGain)
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// create oscilator
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voice.osc.type = 'sine'
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voice.osc.connect(voice.gain)
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voice.osc.start()
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masterGain.connect(audioEngine.destination)
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}
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// AMBIENT
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// BUTTON HOVER
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