Add setting for specifying custom framerate when window is not active

Source/Engine/Engine/Base/GameBase.cpp

@@ -176,6 +176,7 @@ Window* GameBase::CreateMainWindow()
     settings.AllowMinimize = true;
     settings.Size = Platform::GetDesktopSize();
     settings.Position = Float2::Zero;
+    settings.WindowFPSWhenNotFocused = 0;
 
     Game::InitMainWindowSettings(settings);
 

Source/Engine/Platform/Base/WindowBase.cpp

@@ -14,6 +14,7 @@
 #include "Engine/Scripting/ManagedCLR/MUtils.h"
 #include "Engine/Scripting/ManagedCLR/MMethod.h"
 #include "Engine/Scripting/ManagedCLR/MClass.h"
+#include "Engine/Engine/Time.h"
 
 #if USE_CSHARP
 // Helper macros for calling C# events
@@ -436,6 +437,9 @@ void WindowBase::OnGotFocus()
         return;
     _focused = true;
 
+    if (RenderTask && _settings.WindowFPSWhenNotFocused > ZeroTolerance)
+        RenderTask->RenderFPS = 0;
+
     GotFocus();
     INVOKE_EVENT_PARAMS_0(OnGotFocus);
 }
@@ -446,6 +450,9 @@ void WindowBase::OnLostFocus()
         return;
     _focused = false;
 
+    if (RenderTask && _settings.WindowFPSWhenNotFocused > ZeroTolerance)
+        RenderTask->RenderFPS = _settings.WindowFPSWhenNotFocused;
+
     LostFocus();
     INVOKE_EVENT_PARAMS_0(OnLostFocus);
 }

Source/Engine/Platform/CreateWindowSettings.cs

@@ -24,6 +24,7 @@ namespace FlaxEngine
             IsRegularWindow = true,
             HasSizingFrame = true,
             ShowAfterFirstPaint = true,
+            WindowFPSWhenNotFocused = 2,
         };
     }
 }

Source/Engine/Platform/CreateWindowSettings.h

@@ -133,6 +133,11 @@ DECLARE_SCRIPTING_TYPE_MINIMAL(CreateWindowSettings);
     /// </summary>
     API_FIELD() bool ShowAfterFirstPaint = true;
 
+    /// <summary>
+    /// Custom framerate limit for window rendering when the window is not focused.
+    /// </summary>
+    API_FIELD() int WindowFPSWhenNotFocused = 2;
+
     /// <summary>
     /// The custom data (platform dependant).
     /// </summary>