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// Copied from https://github.com/NiklasEi/bevy_game_template/blob/main/build/web/sound.js
// Insert hack to make sound autoplay on Chrome as soon as the user interacts with the tab:
// https://developers.google.com/web/updates/2018/11/web-audio-autoplay#moving-forward
// the following function keeps track of all AudioContexts and resumes them on the first user
// interaction with the page. If the function is called and all contexts are already running,
// it will remove itself from all event listeners.
(function () {
// An array of all contexts to resume on the page
const audioContextList = [];
// An array of various user interaction events we should listen for
const userInputEventNames = [
"click",
"contextmenu",
"auxclick",
"dblclick",
"mousedown",
"mouseup",
"pointerup",
"touchend",
"keydown",
"keyup",
];
// A proxy object to intercept AudioContexts and
// add them to the array for tracking and resuming later
self.AudioContext = new Proxy(self.AudioContext, {
construct(target, args) {
const result = new target(...args);
audioContextList.push(result);
return result;
},
});
// To resume all AudioContexts being tracked
function resumeAllContexts(_event) {
let count = 0;
audioContextList.forEach((context) => {
if (context.state !== "running") {
context.resume();
} else {
count++;
}
});
// If all the AudioContexts have now resumed then we unbind all
// the event listeners from the page to prevent unnecessary resume attempts
// Checking count > 0 ensures that the user interaction happens AFTER the game started up
if (count > 0 && count === audioContextList.length) {
userInputEventNames.forEach((eventName) => {
document.removeEventListener(eventName, resumeAllContexts);
});
}
}
// We bind the resume function for each user interaction
// event on the page
userInputEventNames.forEach((eventName) => {
document.addEventListener(eventName, resumeAllContexts);
});
})();