private static void Run()
{
// timer
var timer = Stopwatch.StartNew();
var lastTime = new TimeSpan();
var fixedAccumulator = TimeSpan.Zero;
var framecount = 0;
var frameticks = 0L;
while (Running)
{
var forceFixedTimestep = ForceFixedTimestep;
if (!forceFixedTimestep)
{
System.Input.Step();
}
Modules.FrameStart();
// get current time & diff
var currTime = TimeSpan.FromTicks(timer.Elapsed.Ticks);
var diffTime = (currTime - lastTime);
lastTime = currTime;
// fixed timestep update
{
// fixed delta time is always the same
var fixedTarget = TimeSpan.FromSeconds(1f / Time.FixedStepTarget);
Time.RawDelta = Time.RawFixedDelta = (float)fixedTarget.TotalSeconds;
Time.Delta = Time.FixedDelta = Time.RawFixedDelta * Time.DeltaScale;
if (forceFixedTimestep)
{
Time.RawVariableDelta = Time.RawFixedDelta;
Time.VariableDelta = Time.FixedDelta;
}
// increment time
fixedAccumulator += diffTime;
// if we're forcing fixed timestep and running too fast,
// we should sleep the thread while we wait
if (forceFixedTimestep)
{
while (fixedAccumulator < fixedTarget)
{
Thread.Sleep((int)((fixedTarget - fixedAccumulator).TotalMilliseconds));
currTime = TimeSpan.FromTicks(timer.Elapsed.Ticks);
diffTime = (currTime - lastTime);
lastTime = currTime;
fixedAccumulator += diffTime;
}
}
// Do not allow any update to take longer than our maximum.
if (fixedAccumulator > Time.FixedMaxElapsedTime)
{
fixedAccumulator = Time.FixedMaxElapsedTime;
}
// do as many fixed updates as we can
while (fixedAccumulator >= fixedTarget)
{
Time.FixedDuration += fixedTarget;
fixedAccumulator -= fixedTarget;
if (forceFixedTimestep)
{
Time.Duration += fixedTarget;
System.Input.Step();
Modules.FixedUpdate();
Modules.Update();
}
else
{
Modules.FixedUpdate();
}
if (Exiting)
{
break;
}
}
}
// variable timestep update
if (!forceFixedTimestep)
{
// get Time values
Time.Duration += diffTime;
Time.RawDelta = Time.RawVariableDelta = (float)diffTime.TotalSeconds;
Time.Delta = Time.VariableDelta = Time.RawDelta * Time.DeltaScale;
// update
Modules.Update();
}
Modules.FrameEnd();
// Check if the Primary Window has been closed
if (_primaryWindow == null || !_primaryWindow.Opened)
{
Exit();
}
// render
if (!Exiting)
{
Modules.BeforeRender();
for (int i = 0; i < System.Windows.Count; i++)
{
if (System.Windows[i].Opened)
{
System.Windows[i].Render();
}
}
for (int i = 0; i < System.Windows.Count; i++)
{
if (System.Windows[i].Opened)
{
System.Windows[i].Present();
}
}
Modules.AfterRender();
}
// get fps
framecount++;
if (TimeSpan.FromTicks(timer.Elapsed.Ticks - frameticks).TotalSeconds >= 1)
{
Time.FPS = framecount;
frameticks = timer.Elapsed.Ticks;
framecount = 0;
}
}
// finalize
Modules.Shutdown();
_primaryWindow = null;
Exiting = false;
Log.Info("Exited");
}