43 lines
1.6 KiB
JavaScript
43 lines
1.6 KiB
JavaScript
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"use strict";
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const audio = {
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enabled: false,
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ctx: null,
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ensure() {
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const AudioClass = window.AudioContext || window.webkitAudioContext;
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if (!AudioClass) return null;
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if (!this.ctx) this.ctx = new AudioClass();
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if (this.ctx.state === "suspended") this.ctx.resume();
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return this.ctx;
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},
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toggle() {
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this.enabled = !this.enabled;
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if (this.enabled) this.ensure();
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return this.enabled;
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},
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tone(freq, dur = 0.08, type = "sine", gain = 0.035, slide = 0) {
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if (!this.enabled) return;
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const ctx = this.ensure();
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if (!ctx) return;
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const t0 = ctx.currentTime;
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const osc = ctx.createOscillator();
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const g = ctx.createGain();
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osc.type = type;
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osc.frequency.setValueAtTime(freq, t0);
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if (slide) osc.frequency.linearRampToValueAtTime(Math.max(40, freq + slide), t0 + dur);
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g.gain.setValueAtTime(0.0001, t0);
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g.gain.exponentialRampToValueAtTime(gain, t0 + 0.01);
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g.gain.exponentialRampToValueAtTime(0.0001, t0 + dur);
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osc.connect(g).connect(ctx.destination);
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osc.start(t0);
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osc.stop(t0 + dur + 0.02);
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},
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eat() { this.tone(660 + Math.random() * 140, 0.055, "triangle", 0.026, 120); },
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poke() { this.tone(180, 0.09, "sawtooth", 0.022, -70); },
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birth() { this.tone(520, 0.08, "sine", 0.028, 100); setTimeout(() => this.tone(760, 0.10, "triangle", 0.024, 80), 70); },
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death() { this.tone(150, 0.22, "sine", 0.028, -70); },
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fight() { this.tone(110, 0.055, "square", 0.018, 70); setTimeout(() => this.tone(90, 0.045, "sawtooth", 0.014, -40), 35); },
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phase() { this.tone(440, 0.06, "sine", 0.018, 60); },
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};
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window.TarinaiAudio = audio;
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