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Reduce SFX volume in levels with a lot of off-screen button presses

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Eevee (Evelyn Woods) 2020-10-01 03:08:54 -06:00
parent 9b873764fb
commit 4f5d169d06
1 changed files with 12 additions and 6 deletions
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18
js/main.js
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@ -111,6 +111,12 @@ const OBITUARIES = {
class SFXPlayer {
constructor() {
this.ctx = new (window.AudioContext || window.webkitAudioContext); // come the fuck on, safari
// This automatically reduces volume when a lot of sound effects are playing at once
this.compressor_node = this.ctx.createDynamicsCompressor();
this.compressor_node.threshold.value = -40;
this.compressor_node.ratio.value = 16;
this.compressor_node.connect(this.ctx.destination);
this.player_x = null;
this.player_y = null;
this.sounds = {};
@ -205,17 +211,17 @@ class SFXPlayer {
let dist = Math.sqrt(dx*dx + dy*dy);
let gain = this.ctx.createGain();
// x/(x + a) is a common and delightful way to get an easy asymptote and output between
// 0 and 1. Here, the result is above 80% for almost everything on screen; drops down
// to 50% for things 20 tiles away (which is, roughly, the periphery when standing in
// the center of a CC1 map), and bottoms out at 12.5% for standing in one corner of a
// 0 and 1. Here, the result is above 2/3 for almost everything on screen; drops down
// to 1/3 for things 20 tiles away (which is, roughly, the periphery when standing in
// the center of a CC1 map), and bottoms out at 1/15 for standing in one corner of a
// CC2 map of max size and hearing something on the far opposite corner.
gain.gain.value = 1 - dist / (dist + 20);
gain.gain.value = 1 - dist / (dist + 10);
node.connect(gain);
gain.connect(this.ctx.destination);
gain.connect(this.compressor_node);
}
else {
// Play at full volume
node.connect(this.ctx.destination);
node.connect(this.compressor_node);
}
node.start(this.ctx.currentTime);
}