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added engine.timing.isFixed option

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liabru 2014-05-02 10:48:24 +01:00
parent a77a5fc626
commit bc35c93106
1 changed files with 20 additions and 13 deletions
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33
src/core/Engine.js
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@ -48,7 +48,8 @@ var Engine = {};
correction: 1, correction: 1,
deltaMin: 1000 / _fps, deltaMin: 1000 / _fps,
deltaMax: 1000 / (_fps * 0.5), deltaMax: 1000 / (_fps * 0.5),
timeScale: 1 timeScale: 1,
isFixed: false
}, },
render: { render: {
element: element, element: element,
@ -87,7 +88,7 @@ var Engine = {};
Engine.run = function(engine) { Engine.run = function(engine) {
var timing = engine.timing, var timing = engine.timing,
delta, delta,
correction, correction = 1,
counterTimestamp = 0, counterTimestamp = 0,
frameCounter = 0, frameCounter = 0,
deltaHistory = [], deltaHistory = [],
@ -109,19 +110,25 @@ var Engine = {};
Events.trigger(engine, 'beforeTick', event); Events.trigger(engine, 'beforeTick', event);
delta = (timestamp - timing.timestamp) || _delta; if (timing.isFixed) {
// fixed timestep
delta = timing.delta;
} else {
// dynamic timestep
delta = (timestamp - timing.timestamp) || _delta;
// optimistically filter delta over a few frames, to improve stability // optimistically filter delta over a few frames, to improve stability
deltaHistory.push(delta); deltaHistory.push(delta);
deltaHistory = deltaHistory.slice(-_deltaSampleSize); deltaHistory = deltaHistory.slice(-_deltaSampleSize);
delta = Math.min.apply(null, deltaHistory); delta = Math.min.apply(null, deltaHistory);
// limit delta // limit delta
delta = delta < timing.deltaMin ? timing.deltaMin : delta; delta = delta < timing.deltaMin ? timing.deltaMin : delta;
delta = delta > timing.deltaMax ? timing.deltaMax : delta; delta = delta > timing.deltaMax ? timing.deltaMax : delta;
// time correction for delta // time correction for delta
correction = delta / timing.delta; correction = delta / timing.delta;
}
// time correction for time scaling // time correction for time scaling
if (timeScalePrev !== 0) if (timeScalePrev !== 0)