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Add support for Normalized Frametime Variation (NVFT) #4395

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Add support for Normalized Frametime Variation (NVFT) #4395

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10 changes: 10 additions & 0 deletions indra/newview/llviewerstats.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -234,6 +234,7 @@ LLTrace::SampleStatHandle<U32> FRAMETIME_JITTER_EVENTS("frametimeevents", "Numbe
FRAMETIME_JITTER_EVENTS_LAST_MINUTE("frametimeeventslastmin", "Number of frametime events in the last minute.");

LLTrace::SampleStatHandle<F64> NOTRMALIZED_FRAMETIME_JITTER_SESSION("normalizedframetimejitter", "Normalized frametime jitter over the session.");
LLTrace::SampleStatHandle<F64> NFTV("nftv", "Normalized frametime variation.");

LLTrace::EventStatHandle<LLUnit<F64, LLUnits::Meters> > AGENT_POSITION_SNAP("agentpositionsnap", "agent position corrections");

Expand Down Expand Up @@ -360,6 +361,15 @@ void LLViewerStats::updateFrameStats(const F64Seconds time_diff)
sample(LLStatViewer::FRAMETIME_JITTER_99TH, ninety_ninth_percentile);
sample(LLStatViewer::FRAMETIME_JITTER_95TH, ninety_fifth_percentile);

F64 averageFrameTime = 0;
for (const auto& frame_time : mFrameTimes)
{
averageFrameTime += frame_time.value();
}
averageFrameTime /= mFrameTimes.size();

sample(LLStatViewer::NFTV, frame_time_stddev / averageFrameTime);

mFrameTimes.clear();
mFrameTimesJitter.clear();
mLastFrameTimeSample = F64Seconds(0);
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4 changes: 4 additions & 0 deletions indra/newview/skins/default/xui/en/floater_stats.xml
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Expand Up @@ -58,6 +58,10 @@
label="normalized sess. jitter"
decimal_digits="4"
stat="normalizedframetimejitter"/>
<stat_bar name="normalized_frametime_variation"
label="normalized frametime variation"
decimal_digits="4"
stat="nftv"/>
<stat_bar name="frame_events_per_minute"
label="frame events/minute"
decimal_digits="2"
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