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63 lines
1.6 KiB
63 lines
1.6 KiB
import { Signal } from "./signal";
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// @ts-ignore
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import BackgroundAnimationFrameEmitterWorker from "../webworkers/background_animation_frame_emittter.worker";
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import { createLogger } from "./logging";
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const logger = createLogger("animation_frame");
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const maxDtMs = 1000;
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const resetDtMs = 16;
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export class AnimationFrame {
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constructor() {
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this.frameEmitted = new Signal();
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this.bgFrameEmitted = new Signal();
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this.lastTime = performance.now();
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this.bgLastTime = performance.now();
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this.boundMethod = this.handleAnimationFrame.bind(this);
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this.backgroundWorker = new BackgroundAnimationFrameEmitterWorker();
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this.backgroundWorker.addEventListener("error", err => {
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logger.error("Error in background fps worker:", err);
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});
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this.backgroundWorker.addEventListener("message", this.handleBackgroundTick.bind(this));
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}
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handleBackgroundTick() {
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const time = performance.now();
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let dt = time - this.bgLastTime;
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if (dt > maxDtMs) {
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dt = resetDtMs;
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}
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this.bgFrameEmitted.dispatch(dt);
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this.bgLastTime = time;
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}
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start() {
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assertAlways(window.requestAnimationFrame, "requestAnimationFrame is not supported!");
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this.handleAnimationFrame();
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}
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handleAnimationFrame(time) {
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let dt = time - this.lastTime;
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if (dt > maxDtMs) {
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dt = resetDtMs;
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}
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try {
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this.frameEmitted.dispatch(dt);
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} catch (ex) {
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console.error(ex);
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}
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this.lastTime = time;
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window.requestAnimationFrame(this.boundMethod);
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}
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}
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