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restart audio context on interactions #30

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Merged
merged 1 commit into from
Mar 24, 2023
Merged

restart audio context on interactions #30

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11 changes: 6 additions & 5 deletions wasm/index.html
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Original file line number Diff line number Diff line change
@@ -1,11 +1,12 @@
<!doctype html>
<html lang="en">
<script type="module">
import init from './bevy_game.js'
init()
</script>

<body style="margin: 0px;">
<script type="module">
import './restart-audio-context.js'
import init from './bevy_game.js'
init()
</script>
</body>

</html>
</html>
57 changes: 57 additions & 0 deletions wasm/restart-audio-context.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,57 @@
// taken from https://developer.chrome.com/blog/web-audio-autoplay/#moving-forward
(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
if (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);
});
})();