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pause module when page doesn't have focus

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This commit is contained in:
Dennis Ranke
2022-04-10 23:24:04 +02:00
parent 37f12f5a2c
commit 9ebb6b6d34
4 changed files with 24 additions and 4 deletions
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22
web/src/microw8.js
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@@ -99,9 +99,11 @@ export default function MicroW8(screen, config = {}) {
let audioContext = new AudioContext({sampleRate: 44100});
let keepRunning = true;
let abortController = new AbortController();
cancelFunction = () => {
audioContext.close();
keepRunning = false;
abortController.abort();
}
let cartridgeSize = data.byteLength;
@@ -229,6 +231,24 @@ export default function MicroW8(screen, config = {}) {
let nextFrame = startTime;
audioNode.connect(audioContext.destination);
let isPaused = false;
let pauseTime = startTime;
let updateVisibility = isVisible => {
let now = Date.now();
if(isVisible) {
isPaused = false;
audioContext.resume();
startTime += now - pauseTime;
} else {
isPaused = true;
audioContext.suspend();
pauseTime = now;
}
};
window.addEventListener('focus', () => updateVisibility(true), { signal: abortController.signal });
window.addEventListener('blur', () => updateVisibility(false), { signal: abortController.signal });
updateVisibility(document.hasFocus());
function mainloop() {
if (!keepRunning) {
@@ -238,7 +258,7 @@ export default function MicroW8(screen, config = {}) {
try {
let now = Date.now();
let restart = false;
if (now >= nextFrame) {
if (now >= nextFrame && !isPaused) {
let gamepads = navigator.getGamepads();
let gamepad = 0;
for (let i = 0; i < 4; ++i) {