Add Time.Synchronize to stabilize engine loop

Source/Editor/States/PlayingState.cs

@@ -163,6 +163,8 @@ namespace FlaxEditor.States
             Editor.OnPlayBegin();
             IsPlayModeStarting = false;
             Profiler.EndEvent();
+
+            Time.Synchronize();
         }
 
         private void SetupEditorEnvOptions()
@@ -209,6 +211,8 @@ namespace FlaxEditor.States
             Editor.OnPlayEnd();
             IsPlayModeEnding = false;
             Profiler.EndEvent();
+
+            Time.Synchronize();
         }
     }
 }

Source/Engine/Engine/Engine.cpp

@@ -156,7 +156,7 @@ int32 Engine::Main(const Char* cmdLine)
 #endif
     Log::Logger::WriteFloor();
     LOG_FLUSH();
-    Time::OnBeforeRun();
+    Time::Synchronize();
     EngineImpl::IsReady = true;
 
     // Main engine loop
@@ -465,7 +465,7 @@ void Engine::OnUnpause()
     LOG(Info, "App unpaused");
     Unpause();
 
-    Time::OnBeforeRun();
+    Time::Synchronize();
 }
 
 void Engine::OnExit()

Source/Engine/Engine/Time.cpp

@@ -54,7 +54,7 @@ void TimeSettings::Apply()
     ::MaxUpdateDeltaTime = MaxUpdateDeltaTime;
 }
 
-void Time::TickData::OnBeforeRun(float targetFps, double currentTime)
+void Time::TickData::Synchronize(float targetFps, double currentTime)
 {
     Time = UnscaledTime = TimeSpan::Zero();
     DeltaTime = UnscaledDeltaTime = targetFps > ZeroTolerance ? TimeSpan::FromSeconds(1.0f / targetFps) : TimeSpan::Zero();
@@ -240,13 +240,13 @@ void Time::SetFixedDeltaTime(bool enable, float value)
     FixedDeltaTimeValue = value;
 }
 
-void Time::OnBeforeRun()
+void Time::Synchronize()
 {
     // Initialize tick data (based on a time settings)
     const double time = Platform::GetTimeSeconds();
-    Update.OnBeforeRun(UpdateFPS, time);
-    Physics.OnBeforeRun(PhysicsFPS, time);
-    Draw.OnBeforeRun(DrawFPS, time);
+    Update.Synchronize(UpdateFPS, time);
+    Physics.Synchronize(PhysicsFPS, time);
+    Draw.Synchronize(DrawFPS, time);
 }
 
 bool Time::OnBeginUpdate()

Source/Engine/Engine/Time.h

@@ -225,12 +225,14 @@ public:
     /// <param name="value">The fixed draw/update rate for the time.</param>
     API_FUNCTION() static void SetFixedDeltaTime(bool enable, float value);
 
+    /// <summary>
+    /// Synchronizes update, fixed update and draw. Resets any pending deltas for fresh ticking in sync.
+    /// </summary>
+    API_FUNCTION() static void Synchronize();
+
 private:
-
     // Methods used by the Engine class
 
-    static void OnBeforeRun();
-
     static bool OnBeginUpdate();
     static bool OnBeginPhysics();
     static bool OnBeginDraw();