Fixed double ImGuiLayer

GlitchyEngine/src/Application.bf

@@ -33,7 +33,7 @@ namespace GlitchyEngine
 			_window.EventCallback = new => OnEvent;
 
 			_imGuiLayer = new ImGuiLayer();
-			PushLayer(_imGuiLayer);
+			PushOverlay(_imGuiLayer);
 		}
 
 		public void OnEvent(Event e)

GlitchyEngine/src/ImGui/ImGuiLayer.bf

@@ -13,6 +13,7 @@ namespace GlitchyEngine.ImGui
 
 		public override void OnAttach()
 		{
+			ImGuiImplWin32.EnableDpiAwareness();
 			Log.EngineLogger.Trace("Initializing ImGui...");
 
 			ImGui.CHECKVERSION();
@@ -24,8 +25,12 @@ namespace GlitchyEngine.ImGui
 			io.ConfigFlags |= .DockingEnable;
 			io.ConfigFlags |= .ViewportsEnable;
 
-			ref ImGui.Style style = ref ImGui.GetStyle();
+			// Todo: currently broken in ImGui
+			//io.ConfigFlags |= .DpiEnableScaleFonts;
+			//io.ConfigFlags |= .DpiEnableScaleViewports;
 
+			// When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
+			ref ImGui.Style style = ref ImGui.GetStyle();
 			if(io.ConfigFlags.HasFlag(.ViewportsEnable))
 			{
 				style.WindowRounding = 0.0f;
@@ -36,8 +41,8 @@ namespace GlitchyEngine.ImGui
 
 #if GE_WINDOWS
 			// Todo: temporary, needs to be platform independent
-			ImGuiImplDX11.Init(Platform.DX11.DirectX.Device, Platform.DX11.DirectX.ImmediateContext);
 			ImGuiImplWin32.Init((Windows.HWnd)(int)Application.Get().Window.NativeWindow);
+			ImGuiImplDX11.Init(Platform.DX11.DirectX.Device, Platform.DX11.DirectX.ImmediateContext);
 #endif
 		}
 

GlitchyEngine/src/LayerStack.bf

@@ -4,7 +4,16 @@ namespace GlitchyEngine
 {
 	public class LayerStack
 	{
-		private List<Layer> _layers = new List<Layer>() ~ DeleteContainerAndItems!(_);
+		private List<Layer> _layers = new List<Layer>() ~ delete _;
+
+		public ~this()
+		{
+			for(let layer in _layers)
+			{
+				layer.OnDetach();
+				delete layer;
+			}
+		}
 
 		/*
 		 * Marks the index of the last layer.

GlitchyEngine/src/Platform/Windows/WindowsWindow.bf

@@ -16,6 +16,8 @@ namespace GlitchyEngine
 	/// The windows specific Window implementation
 	public extension Window
 	{
+		const String WindowClassName = "GlitchyEngineWindow";
+
 		private Windows.HInstance _instanceHandle;
 		private Windows.HWnd _windowHandle;
 
@@ -153,6 +155,14 @@ namespace GlitchyEngine
 			Init(desc);
 		}
 		
+		[LinkName("UnregisterClassW")]
+		static extern Windows.IntBool UnregisterClass(char16* className, Windows.HInstance hInstance);
+
+		public ~this()
+		{
+			UnregisterClass(WindowClassName.ToScopedNativeWChar!(), _instanceHandle);
+		}
+
 		private void Init(WindowDescription desc)
 		{
 			Log.EngineLogger.Trace("Creating window \"{}\" ({}, {})...", desc.Title, desc.Width, desc.Height);
@@ -171,7 +181,7 @@ namespace GlitchyEngine
 
 			_windowClass.Cursor = LoadCursorW(0, IDC_ARROW);
 			_windowClass.BackgroundBrush = (HBRUSH)SystemColor.WindowFrame;
-			_windowClass.ClassName = "GlitchyEngineWindow".ToScopedNativeWChar!();
+			_windowClass.ClassName = WindowClassName.ToScopedNativeWChar!();
 
 			if (RegisterClassExW(ref _windowClass) == 0)
 			{

Sandbox/src/SandboxApp.bf

@@ -42,7 +42,6 @@ namespace Sandbox
 		public this()
 		{
 			PushLayer(new ExampleLayer());
-			PushOverlay(new ImGuiLayer());
 		}
 
 		[Export, LinkName("CreateApplication")]