// ========== SOUND ==========
class Snd{
    constructor(){this.x=null}
    init(){if(this.x)return;try{this.x=new(window.AudioContext||window.webkitAudioContext)}catch(e){}}
    _n(d,f1,f2,v,tp){if(!this.x)return;const n=this.x.currentTime,l=this.x.sampleRate*d,b=this.x.createBuffer(1,l,this.x.sampleRate),da=b.getChannelData(0);for(let i=0;i<l;i++)da[i]=(Math.random()*2-1)*Math.pow(1-i/l,2);const s=this.x.createBufferSource();s.buffer=b;const fl=this.x.createBiquadFilter();fl.type=tp||'bandpass';fl.frequency.setValueAtTime(f1,n);if(f2)fl.frequency.exponentialRampToValueAtTime(f2,n+d);fl.Q.value=2;const g=this.x.createGain();g.gain.setValueAtTime(v,n);g.gain.exponentialRampToValueAtTime(.001,n+d);s.connect(fl);fl.connect(g);g.connect(this.x.destination);s.start(n);s.stop(n+d)}
    _t(f,f2,d,v,w){if(!this.x)return;const n=this.x.currentTime,o=this.x.createOscillator();o.type=w||'sine';o.frequency.setValueAtTime(f,n);if(f2)o.frequency.exponentialRampToValueAtTime(f2,n+d);const g=this.x.createGain();g.gain.setValueAtTime(v,n);g.gain.exponentialRampToValueAtTime(.001,n+d);o.connect(g);g.connect(this.x.destination);o.start(n);o.stop(n+d)}
    bite(){this._n(.05,3500,null,.15,'bandpass')}
    boom(){this._n(.3,800,80,.3,'lowpass')}
    laser(){this._t(1800,200,.25,.15);this._t(900,100,.2,.1,'square')}
    lvlUp(){[523,659,784,1047].forEach((f,i)=>setTimeout(()=>this._t(f,null,.25,.12,'square'),i*120))}
    over(){[400,350,300,200].forEach((f,i)=>setTimeout(()=>this._t(f,null,.25,.1,'sawtooth'),i*160))}
}