private void OnClockTimeChanged(object sender, GameClockEventArgs eventArgs)
{
// Scale incoming deltaTime.
long ticks = (long)(eventArgs.DeltaTime.Ticks * Speed);
// Determine time since last time step
AccumulatedTime += new TimeSpan(ticks);
TimeSpan duration = AccumulatedTime.Duration(); // Absolute value
if (duration < MinDeltaTime)
{
// ----- Idle
// Time left before next time step.
// Set idle time and trigger Idle event.
DeltaTime = TimeSpan.Zero;
LostTime = TimeSpan.Zero;
IdleTime = MinDeltaTime - duration;
UpdateEventArgs();
OnIdle(_eventArgs);
}
else
{
// ----- Time Step
FrameCount++;
if (duration > MaxDeltaTime)
{
// Drop time above MaxDeltaTime
LostTime = duration - MaxDeltaTime;
DeltaTime = (AccumulatedTime.Ticks >= 0) ? MaxDeltaTime : -MaxDeltaTime;
}
else
{
// Default
LostTime = TimeSpan.Zero;
DeltaTime = AccumulatedTime;
}
AccumulatedTime = TimeSpan.Zero;
IdleTime = TimeSpan.Zero;
// Update time and trigger next time step
Time += DeltaTime;
UpdateEventArgs();
OnTimeChanged(_eventArgs);
}
}
private void OnClockTimeChanged(object sender, GameClockEventArgs eventArgs)
{
// Scale incoming deltaTime.
long ticks = (long)(eventArgs.DeltaTime.Ticks * Speed);
// Determine time since last time step
AccumulatedTime += new TimeSpan(ticks);
TimeSpan duration = AccumulatedTime.Duration(); // Absolute value
// Ignore small deviations (e.g. on 59.94 Hz displays).
if (Math.Abs(duration.Ticks - StepSize.Ticks) < StepSizeTolerance.Ticks)
{
duration = StepSize;
}
if (duration < StepSize)
{
// ----- Idle
// Time left before next time step.
// Set idle time and trigger Idle event.
DeltaTime = TimeSpan.Zero;
LostTime = TimeSpan.Zero;
IdleTime = StepSize - duration;
UpdateEventArgs();
OnIdle(_eventArgs);
}
else
{
// ----- Time Step
if (duration > _maxStepSize)
{
// Drop time above MaxDeltaTime
AccumulatedSteps = _maxNumberOfSteps;
LostTime = duration - _maxStepSize;
DeltaTime = (ticks >= 0) ? _maxStepSize : -_maxStepSize;
AccumulatedTime = TimeSpan.Zero;
}
else
{
// Adjust Δt to an integer multiple of StepSize
AccumulatedSteps = (int)(duration.Ticks / StepSize.Ticks);
duration = new TimeSpan(AccumulatedSteps * StepSize.Ticks);
LostTime = TimeSpan.Zero;
DeltaTime = (ticks >= 0) ? duration : -duration;
AccumulatedTime -= DeltaTime;
}
IdleTime = TimeSpan.Zero;
// Update time and trigger next time step
if (AccumulateTimeSteps)
{
// Trigger one big time step.
FrameCount++;
Time += DeltaTime;
UpdateEventArgs();
OnTimeChanged(_eventArgs);
}
else
{
// Trigger several constant time steps.
var accumulatedTimeBackup = AccumulatedTime;
// DeltaTime is always equal to the step size.
DeltaTime = StepSize;
// AccumulatedTime is 0. Only in the last time step it is set to the actual rest time.
AccumulatedTime = TimeSpan.Zero;
PendingSteps = AccumulatedSteps - 1;
AccumulatedSteps = 1;
for (; PendingSteps >= 0; PendingSteps--)
{
FrameCount++;
Time += StepSize;
if (PendingSteps == 0)
{
AccumulatedTime = accumulatedTimeBackup;
}
UpdateEventArgs();
OnTimeChanged(_eventArgs);
}
Debug.Assert(AccumulatedTime == accumulatedTimeBackup);
}
AccumulatedSteps = 0;
PendingSteps = 0;
}
}
