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fixed AnimationTimer w/ requestAnimationFrame (nes)

This commit is contained in:
Steven Hugg 2021-08-04 21:09:25 -05:00
parent dd57c65897
commit df44459c7a
1 changed files with 7 additions and 5 deletions
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12
src/common/emu.ts
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@ -233,17 +233,19 @@ export class EmuHalt extends Error {
}
}
export var useRequestAnimationFrame : boolean = typeof window.requestAnimationFrame === 'function'; // need for unit test
export class AnimationTimer {
callback;
running : boolean = false;
pulsing : boolean = false;
lastts = 0;
useReqAnimFrame = typeof window.requestAnimationFrame === 'function'; // need for unit test
nframes;
startts; // for FPS calc
frameRate;
intervalMsec;
useReqAnimFrame = useRequestAnimationFrame;
constructor(frequencyHz:number, callback:() => void) {
this.frameRate = frequencyHz;
@ -252,9 +254,9 @@ export class AnimationTimer {
}
scheduleFrame(msec:number) {
var fn = () => {
var fn = (timestamp) => {
try {
this.nextFrame();
this.nextFrame(timestamp*1000);
} catch (e) {
this.running = false;
this.pulsing = false;
@ -269,12 +271,12 @@ export class AnimationTimer {
nextFrame(ts?:number) {
if (!ts) ts = Date.now();
if (ts - this.lastts < this.intervalMsec*10) {
if (ts - this.lastts < this.intervalMsec*5) {
this.lastts += this.intervalMsec;
} else {
this.lastts = ts + this.intervalMsec; // frames skipped, catch up
}
if (!this.useReqAnimFrame || this.lastts - ts > this.intervalMsec/2) {
if (!this.useReqAnimFrame || (this.lastts - ts) > this.intervalMsec/2) {
if (this.running) {
this.callback();
}