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August 11, 2023 10:00
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requestAnimationFrame fps loop
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| <!doctype html> | |
| <meta name="viewport" content="width=device-width"> | |
| <style> | |
| :root { | |
| font-family: sans-serif; | |
| background: black; | |
| color: white; | |
| } | |
| #frameInfo, #timeInfo, #fps { | |
| font-size: 5em; | |
| padding: 0.2em; | |
| } | |
| </style> | |
| <button onclick="stop()">stop</button> | |
| <button onclick="start()">start</button> | |
| cur frame in this second: <div id="frameInfo"></div> | |
| cur fps: <div id="fps">0</div> | |
| time secs since load: <div id="timeInfo"></div> | |
| <script> | |
| var currFrame = 0 | |
| var nextSec = 1 | |
| function fn(time) { | |
| if (time >= nextSec*1000) { | |
| nextSec++; | |
| document.getElementById("fps").textContent = currFrame; | |
| currFrame = 0 | |
| } | |
| currFrame++ | |
| document.getElementById("frameInfo").textContent = currFrame | |
| document.getElementById("timeInfo").textContent = Math.round(time) / 1000 | |
| curId = requestAnimationFrame(fn) | |
| } | |
| var curId = -1 | |
| function start() { | |
| stop() | |
| curId = requestAnimationFrame(fn) | |
| } | |
| start() | |
| function stop() { | |
| cancelAnimationFrame(curId) | |
| } | |
| </script> | |
| <address>I'm not sure if FPS and current frame are not off by 1.</address> |
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