public void Simulate()
{
if (authoritativeTimeline.Last == null) // Not initialized yet
{
return;
}
logger.Debug("Simulate: time: {0}, commands: {1}"
, time
, nextCommandFrame != null ? nextCommandFrame.Commands.Count : 0);
int lastAcknowledgedCommandTime = -1; // Dequeue acknowledge commands and get last time that command is predicted
if (lastAcknowledgedCommandSeq != null)
{
lastAcknowledgedCommandTime = DequeueAcknowledgedCommands();
}
if (lastAcknowledgedCommandTime >= 0)
{
var authoritativeSnapshot = authoritativeTimeline.Last.Snapshot;
var predictiveTimepoint = predictiveTimeline.InterpolatePoint(lastAcknowledgedCommandTime);
if (predictiveTimepoint == null)
{
throw new InvalidOperationException(); // TODO: Message
}
var currentSnapshot = predictiveTimeline.Last.Snapshot;
if (!authoritativeSnapshot.IsApproximate(predictiveTimepoint.Snapshot)) // Rollback and replay
{
predictiveTimeline = new Timeline();
predictiveTimeline.AddPoint(lastAcknowledgedCommandTime, authoritativeSnapshot);
RecoverSnapshot((SimulatorSnapshot)authoritativeSnapshot);
// TODO: Use SceneDesc.ReconciliationDeltaTime to optimize replay performance
var deltaTime = Scene.Desc.SimulationDeltaTime;
for (var replayTime = lastAcknowledgedCommandTime; replayTime < time; replayTime += deltaTime)
{
if (replayTime + deltaTime > time)
{
deltaTime = time - replayTime;
}
Simulate(from command in unacknowledgedCommands
where command.Time >= replayTime && command.Time < replayTime + deltaTime
select command);
predictiveTimeline.AddPoint(replayTime + deltaTime, CreateSnapshot());
}
}
// TODO: Get jitter detail for analysis
if (!currentSnapshot.IsApproximate(predictiveTimeline.Last.Snapshot))
{
logger.Debug("Correction done with possible jitter");
}
}
if (nextCommandFrame != null || predictiveTimeline != null)
{
SimulatorSnapshot snapshot;
if (predictiveTimeline != null)
{
snapshot = (SimulatorSnapshot)predictiveTimeline.InterpolatePoint(time).Snapshot;
logger.Debug("RecoverSnapshot from predictive timeline");
}
else
{
snapshot = (SimulatorSnapshot)authoritativeTimeline.InterpolatePoint(time).Snapshot;
predictiveTimeline = new Timeline();
predictiveTimeline.AddPoint(time, snapshot);
logger.Debug("RecoverSnapshot from authoritative timeline");
}
RecoverSnapshot(snapshot);
Simulate(nextCommandFrame != null ? nextCommandFrame.Commands : null);
snapshot = CreateSnapshot();
if (unacknowledgedCommands.Count > 0)
{
predictiveTimeline.AddPoint(time + Scene.Desc.SimulationDeltaTime, snapshot);
nextConvergenceTime = time + Scene.Desc.ConvergenceTime;
logger.Debug("Simulate and CreateSnapshot for predictive timeline");
}
else if (time < nextConvergenceTime)
{
/*
* var authoritativeSnapshot = authoritativeTimeline.Last.Snapshot;
*
* // TODO: Need a better convergence algorithm
* //snapshot = (SimulatorSnapshot)((ISnapshotArgs)snapshot).Interpolate(authoritativeSnapshot, Scene.Desc.ConvergenceRate);
*
* if (authoritativeSnapshot.IsApproximate(snapshot))
* {
* logger.Debug("All commands are acknowledged and convergence is done in advance: {0} < {1}", time, nextConvergenceTime);
*
* snapshot = (SimulatorSnapshot)authoritativeSnapshot;
*
* predictiveTimeline = null;
* nextConvergenceTime = null;
* }
* else
* {
* predictiveTimeline.AddPoint(time + Scene.Desc.SimulationDeltaTime, snapshot);
*
* logger.Info("All commands are acknowledged and convergence predictive timeline");
* }
*/
}
else
{
predictiveTimeline = null;
nextConvergenceTime = null;
snapshot = (SimulatorSnapshot)authoritativeTimeline.InterpolatePoint(time + Scene.Desc.SimulationDeltaTime).Snapshot;
logger.Debug("RecoverSnapshot from authoritative timeline and remove predictive timeline");
}
RecoverSnapshot(snapshot);
}
else
{
var snapshot = (SimulatorSnapshot)authoritativeTimeline.InterpolatePoint(time + Scene.Desc.SimulationDeltaTime).Snapshot;
logger.Debug("RecoverSnapshot from authoritative timeline");
RecoverSnapshot(snapshot);
}
CurrentStats.Time = time;
CurrentStats.DeltaTime = Scene.Desc.SimulationDeltaTime;
CurrentStats.SimulateTime = DateTime.UtcNow;
CurrentStats.AdvanceStats(StatsFrames.Current);
Scene.OnLateUpdate();
StatsFrames.CreateNextFrame();
StatsFrames.Current.AddStats <ClientSimulatorStats>();
CurrentStats.CreateTime = DateTime.UtcNow;
time += Scene.Desc.SimulationDeltaTime;
commandFrame = nextCommandFrame;
nextCommandFrame = null;
lastAcknowledgedCommandSeq = null;
}
public void SaveStatsFrame(string filename)
{
File.WriteAllText(filename, StatsFrames.ToCsv());
}