82 lines
3.3 KiB
JavaScript
82 lines
3.3 KiB
JavaScript
"use strict";
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const AsteroidThreatAlarmSound = (function(){
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return function(audio_ctx, output_node, volume_multiplier = 1.0, threat_level = 0.5){
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const now = audio_ctx.currentTime;
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const threat = Math.max(0.0, Math.min(1.0, threat_level));
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// Bus maestro de cabina
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const master_bus = audio_ctx.createGain();
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master_bus.gain.setValueAtTime(volume_multiplier * 0.5, now);
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// Filtro de megafonía/altavoz de instrumentación (elimina graves y agudos molestos)
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const horn_filter = audio_ctx.createBiquadFilter();
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horn_filter.type = "bandpass";
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horn_filter.frequency.setValueAtTime(1150, now);
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horn_filter.Q.setValueAtTime(1.8, now);
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master_bus.connect(horn_filter);
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horn_filter.connect(output_node);
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// Función que sintetiza un 'BEEP' limpio de aviónica
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const trigger_avionics_beep = (start_time, freq) => {
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const beep_duration = 0.065; // 65ms: corto, clínico y penetrante
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// Envolvente de amplitud trapezoidal (ataque 4ms, salida 8ms)
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const env = audio_ctx.createGain();
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env.gain.setValueAtTime(0.0001, start_time);
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env.gain.linearRampToValueAtTime(0.85, start_time + 0.004);
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env.gain.setValueAtTime(0.85, start_time + beep_duration - 0.008);
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env.gain.exponentialRampToValueAtTime(0.0001, start_time + beep_duration);
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// 1. Tono fundamental limpio
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const osc_main = audio_ctx.createOscillator();
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osc_main.type = "sine";
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osc_main.frequency.setValueAtTime(freq, start_time);
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// 2. Segundo armónico discreto (le da presencia de instrumento de cabina)
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const osc_harm = audio_ctx.createOscillator();
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const harm_gain = audio_ctx.createGain();
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osc_harm.type = "sine";
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osc_harm.frequency.setValueAtTime(freq * 2, start_time);
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harm_gain.gain.setValueAtTime(0.18, start_time);
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// 3. Toque de onda triangular sutil para cuerpo mecánico
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const osc_tri = audio_ctx.createOscillator();
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const tri_gain = audio_ctx.createGain();
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osc_tri.type = "triangle";
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osc_tri.frequency.setValueAtTime(freq, start_time);
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tri_gain.gain.setValueAtTime(0.12, start_time);
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osc_main.connect(env);
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osc_harm.connect(harm_gain);
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harm_gain.connect(env);
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osc_tri.connect(tri_gain);
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tri_gain.connect(env);
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env.connect(master_bus);
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osc_main.start(start_time);
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osc_harm.start(start_time);
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osc_tri.start(start_time);
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osc_main.stop(start_time + beep_duration);
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osc_harm.stop(start_time + beep_duration);
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osc_tri.stop(start_time + beep_duration);
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};
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// Frecuencia estándar de advertencia: 1020 Hz (tono aeronáutico estándar)
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// Si la piedra viene de camino a la cabina (> 0.6), sube ligeramente a 1280 Hz
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const base_freq = threat > 0.6 ? 1280 : 1020;
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// Primer beep
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trigger_avionics_beep(now, base_freq);
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// Si el peligro es inminente (la roca ya fue lanzada a cabina), emite un doble beep militar ("PIP-PIP")
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if(threat > 0.6){
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trigger_avionics_beep(now + 0.09, base_freq);
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}
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};
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})(); |