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Added delta history cool down period to avoid spikes flooding the values.

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This commit is contained in:
Richard Davey 2017-05-09 10:42:43 +01:00
parent 21882a24ec
commit 253dc76081
2 changed files with 26 additions and 8 deletions
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32
v3/src/boot/TimeStep.js
View file

@ -51,6 +51,7 @@ var TimeStep = function (game, config)
this.frame = 0;
this._pauseTime = 0;
this._coolDown = 0;
this.delta = 0;
this.deltaIndex = 0;
@ -65,7 +66,7 @@ TimeStep.prototype = {
// Called when the visibility API says the game is 'hidden' (tab switch, etc)
pause: function ()
{
console.log('TimeStep.pause');
// console.log('TimeStep.pause');
this._pauseTime = window.performance.now();
},
@ -77,7 +78,7 @@ TimeStep.prototype = {
this.startTime += this.time - this._pauseTime;
console.log('TimeStep.resume - paused for', (this.time - this._pauseTime));
// console.log('TimeStep.resume - paused for', (this.time - this._pauseTime));
},
resetDelta: function ()
@ -99,6 +100,8 @@ TimeStep.prototype = {
this.delta = 0;
this.deltaIndex = 0;
this._coolDown = this.deltaSmoothingMax;
},
start: function (callback)
@ -127,7 +130,7 @@ TimeStep.prototype = {
step: function (time)
{
// Debug only
var debug = null;
var debug = 0;
var dump = [];
this.frame++;
@ -137,11 +140,22 @@ TimeStep.prototype = {
var max = this.deltaSmoothingMax;
// delta time (time is in ms)
var dt = (time - this.lastTime);
var dt;
// When a browser switches tab, then comes back again, it takes around 10 frames before
// the delta time settles down again, and this is likely device specific (some may be
// faster or slower)
// the delta time settles down so we employ a 'cooling down' period before we start
// trusting the delta values again, to avoid spikes flooding through our delta average
if (this._coolDown > 0)
{
this._coolDown--;
dt = this._target;
}
else
{
dt = (time - this.lastTime);
}
// min / max range (yes, the < and > should be this way around)
if (dt > this._min || dt < this._max)
@ -220,7 +234,8 @@ TimeStep.prototype = {
// Shift time value over
this.lastTime = time;
if (debug || dump.length)
/*
if (debug !== 0 || dump.length)
{
console.group('Frame ' + this.frame);
console.log('Interpolation', interpolation, '%');
@ -230,6 +245,8 @@ TimeStep.prototype = {
console.log('Elapsed', debug, 'ms');
}
// console.log('Frame', this.frame, 'Delta', avg, '(average)', debug, '(now)');
console.log('Delta', avg, '(average)');
if (dump.length)
@ -239,6 +256,7 @@ TimeStep.prototype = {
console.groupEnd();
}
*/
},
tick: function ()

2
v3/src/checksum.js
View file

@ -1,4 +1,4 @@
var CHECKSUM = {
build: 'e3a798e0-344c-11e7-937e-fdfcde3f0dd0'
build: 'ce2cd7b0-349b-11e7-aae4-476e7c9af236'
};
module.exports = CHECKSUM;