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New property reporting worst-case frame latency.

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Shows maximum latency of any frame within the last second.
This commit is contained in:
ThorstenB 2011-03-28 00:16:27 +02:00
parent d7798a7cc2
commit dca2132087
2 changed files with 11 additions and 3 deletions
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10
src/Time/TimeManager.cxx
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@ -88,9 +88,11 @@ void TimeManager::init()
_warp->getIntValue());
globals->set_time_params(_impl);
// frame/update-rate counters
// frame-rate / worst-case delay / update-rate counters
_frameRate = fgGetNode("/sim/frame-rate", true);
_frameDelayMax = fgGetNode("/sim/frame-delay-max-ms", true);
_lastFrameTime = 0;
_wcFrameDelayMax = 0.0;
_frameCount = 0;
}
@ -160,7 +162,9 @@ void TimeManager::computeTimeDeltas(double& simDt, double& realDt)
SGTimeStamp currentStamp;
currentStamp.stamp();
double dt = (currentStamp - _lastStamp).toSecs();
if (dt > _wcFrameDelayMax)
_wcFrameDelayMax = dt;
// Limit the time we need to spend in simulation loops
// That means, if the /sim/max-simtime-per-frame value is strictly positive
// you can limit the maximum amount of time you will do simulations for
@ -251,7 +255,9 @@ void TimeManager::computeFrameRate()
// Calculate frame rate average
if ((_impl->get_cur_time() != _lastFrameTime)) {
_frameRate->setIntValue(_frameCount);
_frameDelayMax->setDoubleValue(_wcFrameDelayMax*1000);
_frameCount = 0;
_wcFrameDelayMax = 0.0;
}
_lastFrameTime = _impl->get_cur_time();

4
src/Time/TimeManager.hxx
View file

@ -78,9 +78,11 @@ private:
SGPropertyNode_ptr _longitudeDeg;
SGPropertyNode_ptr _latitudeDeg;
// frame-rate / update-rate counters
// frame-rate / worst-case delay / update-rate counters
SGPropertyNode_ptr _frameRate;
SGPropertyNode_ptr _frameDelayMax;
time_t _lastFrameTime;
double _wcFrameDelayMax;
int _frameCount;
};