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made AnimationTimer a class

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This commit is contained in:
Steven Hugg 2018-12-04 21:08:46 -05:00
parent b6db88bc97
commit d575cda583
1 changed files with 48 additions and 37 deletions
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85
src/emu.ts
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@ -209,59 +209,70 @@ export class RAM {
} }
} }
export var AnimationTimer = function(frequencyHz:number, callback:() => void) { export class AnimationTimer {
var intervalMsec = 1000.0 / frequencyHz;
var running : boolean = false;
var pulsing : boolean = false;
var lastts = 0;
var useReqAnimFrame = false; //TODO window.requestAnimationFrame ? (frequencyHz>40) : false;
var nframes, startts; // for FPS calc
this.frameRate = frequencyHz;
function scheduleFrame(msec:number) { callback;
if (useReqAnimFrame) running : boolean = false;
window.requestAnimationFrame(nextFrame); pulsing : boolean = false;
lastts = 0;
useReqAnimFrame = false; //TODO window.requestAnimationFrame ? (frequencyHz>40) : false;
nframes;
startts; // for FPS calc
frameRate;
intervalMsec;
constructor(frequencyHz:number, callback:() => void) {
this.frameRate = frequencyHz;
this.intervalMsec = 1000.0 / frequencyHz;
this.callback = callback;
}
scheduleFrame(msec:number) {
if (this.useReqAnimFrame)
window.requestAnimationFrame(this.nextFrame.bind(this));
else else
setTimeout(nextFrame, msec); setTimeout(this.nextFrame.bind(this), msec);
} }
function nextFrame(ts:number) {
nextFrame(ts:number) {
if (!ts) ts = Date.now(); if (!ts) ts = Date.now();
if (ts - lastts < intervalMsec*10) { if (ts - this.lastts < this.intervalMsec*10) {
lastts += intervalMsec; this.lastts += this.intervalMsec;
} else { } else {
lastts = ts + intervalMsec; // frames skipped, catch up this.lastts = ts + this.intervalMsec; // frames skipped, catch up
} }
if (!useReqAnimFrame || lastts - ts > intervalMsec/2) { if (!this.useReqAnimFrame || this.lastts - ts > this.intervalMsec/2) {
if (running) { if (this.running) {
callback(); this.callback();
} }
if (nframes == 0) startts = ts; if (this.nframes == 0)
if (nframes++ == 300) { this.startts = ts;
console.log("Avg framerate: " + nframes*1000/(ts-startts) + " fps"); if (this.nframes++ == 300) {
console.log("Avg framerate: " + this.nframes*1000/(ts-this.startts) + " fps");
} }
} }
if (running) { if (this.running) {
scheduleFrame(lastts - ts); this.scheduleFrame(this.lastts - ts);
} else { } else {
pulsing = false; this.pulsing = false;
} }
} }
this.isRunning = function() { isRunning() {
return running; return this.running;
} }
this.start = function() { start() {
if (!running) { if (!this.running) {
running = true; this.running = true;
lastts = 0; this.lastts = 0;
nframes = 0; this.nframes = 0;
if (!pulsing) { if (!this.pulsing) {
scheduleFrame(0); this.scheduleFrame(0);
pulsing = true; this.pulsing = true;
} }
} }
} }
this.stop = function() { stop() {
running = false; this.running = false;
} }
} }