_managed handle pool start

Use the runtime identifier detected during runtime instead of
calling the dotnet tool in order to query it.

.github/ISSUE_TEMPLATE/1-bug.yaml

@@ -31,7 +31,7 @@ body:
         - '1.10'
         - '1.11'
         - master branch
-      default: 2
+      default: 3
     validations:
       required: true
   - type: textarea

.github/workflows/build_linux.yml

@@ -16,7 +16,7 @@ jobs:
       uses: actions/checkout@v3
     - name: Install dependencies
       run: |
-        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
+        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev libwayland-dev
     - name: Setup Vulkan
       uses: ./.github/actions/vulkan
     - name: Setup .NET
@@ -44,7 +44,7 @@ jobs:
       uses: actions/checkout@v3
     - name: Install dependencies
       run: |
-        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev
+        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev libwayland-dev
     - name: Setup Vulkan
       uses: ./.github/actions/vulkan
     - name: Setup .NET

.github/workflows/tests.yml

@@ -28,7 +28,7 @@ jobs:
         git lfs pull
     - name: Install dependencies
       run: |
-        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
+        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev libwayland-dev
     - name: Build
       run: |
         ./GenerateProjectFiles.sh -vs2022 -log -verbose -printSDKs -dotnet=8

Flax.flaxproj

@@ -4,7 +4,7 @@
     "Major": 1,
     "Minor": 11,
     "Revision": 0,
-    "Build": 6802
+    "Build": 6805
   },
   "Company": "Flax",
   "Copyright": "Copyright (c) 2012-2025 Wojciech Figat. All rights reserved.",
@@ -13,6 +13,7 @@
   "Configuration": {
     "UseCSharp": true,
     "UseLargeWorlds": false,
-    "UseDotNet": true
+    "UseDotNet": true,
+    "UseSDL": true
   }
 }

GenerateProjectFiles.bat

@@ -15,7 +15,7 @@ if errorlevel 1 goto BuildToolFailed
 
 :: Build bindings for all editor configurations
 echo Building C# bindings...
-Binaries\Tools\Flax.Build.exe -build -BuildBindingsOnly -arch=x64 -platform=Windows --buildTargets=FlaxEditor
+Binaries\Tools\Flax.Build.exe -build -BuildBindingsOnly -arch=x64 -platform=Windows --buildTargets=FlaxEditor,FlaxGame
 
 popd
 echo Done!

Source/Editor/Content/Items/ContentFolder.cs

@@ -282,7 +282,7 @@ namespace FlaxEditor.Content
 
             if (data is DragDataFiles)
                 return DragDropEffect.Copy;
-            return _dragOverItems.Effect;
+            return _dragOverItems?.Effect ?? DragDropEffect.None;
         }
 
         /// <inheritdoc />

Source/Editor/Content/Items/ContentItem.cs

@@ -749,7 +749,7 @@ namespace FlaxEditor.Content
             }
 
             // Draw short name
-            Render2D.PushClip(ref textRect);
+            Render2D.PushClip(textRect);
             var scale = 0.95f * view.ViewScale;
             Render2D.DrawText(style.FontMedium, ShowFileExtension || view.ShowFileExtensions ? FileName : ShortName, textRect, style.Foreground, nameAlignment, TextAlignment.Center, TextWrapping.WrapWords, 1f, scale);
             Render2D.PopClip();

Source/Editor/Content/Items/CppScriptItem.cs

@@ -20,7 +20,7 @@ namespace FlaxEditor.Content
         }
 
         /// <inheritdoc />
-        public override string TypeDescription => Path.EndsWith(".h") ? "C++ Header File" : "C++ Source Code";
+        public override string TypeDescription => Path.EndsWith(".h") || Path.EndsWith(".hpp") ? "C++ Header File" : "C++ Source Code";
 
         /// <inheritdoc />
         public override SpriteHandle DefaultThumbnail => Editor.Instance.Icons.CPPScript128;

Source/Editor/Content/Items/VisualScriptItem.cs

@@ -281,6 +281,13 @@ namespace FlaxEditor.Content
 
         private void CacheData()
         {
+            if (!_asset)
+            {
+                _parameters = Utils.GetEmptyArray<ScriptMemberInfo>();
+                _methods = Utils.GetEmptyArray<ScriptMemberInfo>();
+                _attributes = Utils.GetEmptyArray<Attribute>();
+                return;
+            }
             if (_parameters != null)
                 return;
             if (_asset.WaitForLoaded())
@@ -344,13 +351,13 @@ namespace FlaxEditor.Content
         }
 
         /// <inheritdoc />
-        public string Name => Path.GetFileNameWithoutExtension(_asset.Path);
+        public string Name => _asset ? Path.GetFileNameWithoutExtension(_asset.Path) : null;
 
         /// <inheritdoc />
         public string Namespace => string.Empty;
 
         /// <inheritdoc />
-        public string TypeName => JsonSerializer.GetStringID(_asset.ID);
+        public string TypeName => _asset ? JsonSerializer.GetStringID(_asset.ID) : null;
 
         /// <inheritdoc />
         public bool IsPublic => true;

Source/Editor/Content/Thumbnails/ThumbnailsModule.cs

@@ -263,7 +263,7 @@ namespace FlaxEditor.Content.Thumbnails
             // Create render task but disabled for now
             _output = GPUDevice.Instance.CreateTexture("ThumbnailsOutput");
             var desc = GPUTextureDescription.New2D(PreviewsCache.AssetIconSize, PreviewsCache.AssetIconSize, PreviewsCache.AssetIconsAtlasFormat);
-            _output.Init(ref desc);
+            _output.Init(desc);
             _task = Object.New<RenderTask>();
             _task.Order = 50; // Render this task later
             _task.Enabled = false;

Source/Editor/Cooker/Platform/GDK/GDKPlatformTools.cpp

@@ -15,26 +15,32 @@
 #include "Editor/ProjectInfo.h"
 #include "Editor/Utilities/EditorUtilities.h"
 
-GDKPlatformTools::GDKPlatformTools()
+String GetGDK()
 {
-    // Find GDK
-    Platform::GetEnvironmentVariable(TEXT("GameDKLatest"), _gdkPath);
-    if (_gdkPath.IsEmpty() || !FileSystem::DirectoryExists(_gdkPath))
+    String gdk;
+    Platform::GetEnvironmentVariable(TEXT("GameDKLatest"), gdk);
+    if (gdk.IsEmpty() || !FileSystem::DirectoryExists(gdk))
     {
-        _gdkPath.Clear();
-        Platform::GetEnvironmentVariable(TEXT("GRDKLatest"), _gdkPath);
-        if (_gdkPath.IsEmpty() || !FileSystem::DirectoryExists(_gdkPath))
+        gdk.Clear();
+        Platform::GetEnvironmentVariable(TEXT("GRDKLatest"), gdk);
+        if (gdk.IsEmpty() || !FileSystem::DirectoryExists(gdk))
         {
-            _gdkPath.Clear();
+            gdk.Clear();
         }
         else
         {
-            if (_gdkPath.EndsWith(TEXT("GRDK\\")))
-                _gdkPath.Remove(_gdkPath.Length() - 6);
-            else if (_gdkPath.EndsWith(TEXT("GRDK")))
-                _gdkPath.Remove(_gdkPath.Length() - 5);
+            if (gdk.EndsWith(TEXT("GRDK\\")))
+                gdk.Remove(gdk.Length() - 6);
+            else if (gdk.EndsWith(TEXT("GRDK")))
+                gdk.Remove(gdk.Length() - 5);
         }
     }
+    return gdk;
+}
+
+GDKPlatformTools::GDKPlatformTools()
+{
+    _gdkPath = GetGDK();
 }
 
 DotNetAOTModes GDKPlatformTools::UseAOT() const
@@ -121,7 +127,7 @@ bool GDKPlatformTools::OnPostProcess(CookingData& data, GDKPlatformSettings* pla
         validName.Add('\0');
 
         sb.Append(TEXT("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"));
-        sb.Append(TEXT("<Game configVersion=\"0\">\n"));
+        sb.Append(TEXT("<Game configVersion=\"1\">\n"));
         sb.AppendFormat(TEXT("  <Identity Name=\"{0}\" Publisher=\"{1}\" Version=\"{2}\"/>\n"),
                         validName.Get(),
                         platformSettings->PublisherName.HasChars() ? platformSettings->PublisherName : TEXT("CN=") + gameSettings->CompanyName,

Source/Editor/Cooker/Steps/CompileScriptsStep.cpp

@@ -10,9 +10,10 @@
 #include "Engine/Serialization/JsonTools.h"
 #include "Engine/Serialization/JsonWriters.h"
 #include "Editor/Cooker/PlatformTools.h"
+#include "Engine/Engine/Globals.h"
 #include "Editor/Editor.h"
 #include "Editor/ProjectInfo.h"
-#include "Engine/Engine/Globals.h"
+#include "Editor/Utilities/EditorUtilities.h"
 #if PLATFORM_MAC
 #include <sys/stat.h>
 #endif
@@ -127,7 +128,7 @@ bool CompileScriptsStep::DeployBinaries(CookingData& data, const String& path, c
         const String dst = dstPath / StringUtils::GetFileName(file);
         if (dst == file)
             continue;
-        if (FileSystem::CopyFile(dst, file))
+        if (EditorUtilities::CopyFileIfNewer(dst, file))
         {
             data.Error(String::Format(TEXT("Failed to copy file from {0} to {1}."), file, dst));
             return true;

Source/Editor/Cooker/Steps/CookAssetsStep.cpp

@@ -526,6 +526,7 @@ bool ProcessShaderBase(CookAssetsStep::AssetCookData& data, ShaderAssetBase* ass
 #if PLATFORM_TOOLS_XBOX_SCARLETT
     case BuildPlatform::XboxScarlett:
     {
+        options.Platform = PlatformType::XboxScarlett;
         const char* platformDefineName = "PLATFORM_XBOX_SCARLETT";
         COMPILE_PROFILE(DirectX_SM6, SHADER_FILE_CHUNK_INTERNAL_D3D_SM6_CACHE);
         break;
@@ -1367,7 +1368,10 @@ bool CookAssetsStep::Perform(CookingData& data)
             {
                 typeName = e.TypeName;
             }
-            LOG(Info, "{0}: {1:>4} assets of total size {2}", typeName, e.Count, Utilities::BytesToText(e.ContentSize));
+            if (e.Count == 1)
+                LOG(Info, "{0}:    1 asset  of total size {1}", typeName, Utilities::BytesToText(e.ContentSize));
+            else
+                LOG(Info, "{0}: {1:>4} assets of total size {2}", typeName, e.Count, Utilities::BytesToText(e.ContentSize));
         }
         LOG(Info, "");
     }

Source/Editor/Cooker/Steps/DeployDataStep.cpp

@@ -265,7 +265,7 @@ bool DeployDataStep::Perform(CookingData& data)
                         }
                         if (version.IsEmpty())
                         {
-                            data.Error(String::Format(TEXT("Failed to find supported .NET {} version (min {}) for the current host platform."), maxVer, minVer));
+                            data.Error(String::Format(TEXT("Failed to find supported .NET {} version (min {}) for {} platform."), maxVer, minVer, platformName));
                             return true;
                         }
                     }

Source/Editor/Cooker/Steps/PrecompileAssembliesStep.cpp

@@ -59,6 +59,7 @@ bool PrecompileAssembliesStep::Perform(CookingData& data)
     data.StepProgress(infoMsg, 0);
 
     // Override Newtonsoft.Json with AOT-version (one that doesn't use System.Reflection.Emit)
+    // TODO: remove it since EngineModule does properly reference AOT lib now
     EditorUtilities::CopyFileIfNewer(data.ManagedCodeOutputPath / TEXT("Newtonsoft.Json.dll"), Globals::StartupFolder / TEXT("Source/Platforms/DotNet/AOT/Newtonsoft.Json.dll"));
     FileSystem::DeleteFile(data.ManagedCodeOutputPath / TEXT("Newtonsoft.Json.xml"));
     FileSystem::DeleteFile(data.ManagedCodeOutputPath / TEXT("Newtonsoft.Json.pdb"));

Source/Editor/CustomEditors/Dedicated/ActorEditor.cs

@@ -60,14 +60,14 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 if (prefab && !prefab.WaitForLoaded())
                 {
                     var prefabObjectId = actor.PrefabObjectID;
-                    var prefabInstance = prefab.GetDefaultInstance(ref prefabObjectId);
+                    var prefabInstance = prefab.GetDefaultInstance(prefabObjectId);
                     if (prefabInstance != null)
                     {
                         // Use default prefab instance as a reference for the editor
                         Values.SetReferenceValue(prefabInstance);
 
                         // Display prefab UI (when displaying object inside Prefab Window then display only nested prefabs)
-                        prefab.GetNestedObject(ref prefabObjectId, out var nestedPrefabId, out var nestedPrefabObjectId);
+                        prefab.GetNestedObject(prefabObjectId, out var nestedPrefabId, out var nestedPrefabObjectId);
                         var nestedPrefab = FlaxEngine.Content.Load<Prefab>(nestedPrefabId);
                         var panel = layout.UniformGrid();
                         panel.CustomControl.Height = 20.0f;
@@ -207,7 +207,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 {
                     var actor = (Actor)Values[0];
                     var prefabObjectId = actor.PrefabObjectID;
-                    var prefabInstance = prefab.GetDefaultInstance(ref prefabObjectId);
+                    var prefabInstance = prefab.GetDefaultInstance(prefabObjectId);
                     if (prefabInstance != null)
                     {
                         Values.SetReferenceValue(prefabInstance);
@@ -525,7 +525,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 var restored = actor.AddScript(removed.PrefabObject.GetType());
                 var prefabId = actor.PrefabID;
                 var prefabObjectId = restored.PrefabObjectID;
-                Script.Internal_LinkPrefab(FlaxEngine.Object.GetUnmanagedPtr(restored), ref prefabId, ref prefabObjectId);
+                Script.Internal_LinkPrefab(FlaxEngine.Object.GetUnmanagedPtr(restored), prefabId, prefabObjectId);
                 string data = JsonSerializer.Serialize(removed.PrefabObject);
                 JsonSerializer.Deserialize(restored, data);
 
@@ -547,7 +547,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 string data = JsonSerializer.Serialize(removedActor.PrefabObject);
                 JsonSerializer.Deserialize(restored, data);
                 Presenter.Owner.SceneContext.Spawn(restored, parentActor, removedActor.OrderInParent);
-                Actor.Internal_LinkPrefab(FlaxEngine.Object.GetUnmanagedPtr(restored), ref prefabId, ref prefabObjectId);
+                Actor.Internal_LinkPrefab(FlaxEngine.Object.GetUnmanagedPtr(restored), prefabId, prefabObjectId);
                 return;
             }
 

Source/Editor/CustomEditors/Dedicated/EnvironmentProbeEditor.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Wojciech Figat. All rights reserved.
 
 using FlaxEngine;
+using FlaxEngine.GUI;
 
 namespace FlaxEditor.CustomEditors.Dedicated
 {
@@ -11,7 +12,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
     [CustomEditor(typeof(EnvironmentProbe)), DefaultEditor]
     public class EnvironmentProbeEditor : ActorEditor
     {
-        private FlaxEngine.GUI.Button _bake;
+        private Button _bake;
 
         /// <inheritdoc />
         public override void Initialize(LayoutElementsContainer layout)
@@ -20,8 +21,9 @@ namespace FlaxEditor.CustomEditors.Dedicated
 
             if (Values.HasDifferentTypes == false)
             {
-                layout.Space(10);
-                _bake = layout.Button("Bake").Button;
+                var group = layout.Group("Bake");
+                group.Panel.ItemsMargin = new Margin(Utilities.Constants.UIMargin * 2);
+                _bake = group.Button("Bake").Button;
                 _bake.Clicked += BakeButtonClicked;
             }
         }

Source/Editor/CustomEditors/Dedicated/LocalizationSettingsEditor.cs

@@ -190,12 +190,12 @@ namespace FlaxEditor.CustomEditors.Dedicated
                     foreach (var file in files)
                         FindNewKeysCSharp(file, newKeys, allKeys);
 
-                    // C++
-                    files = Directory.GetFiles(Globals.ProjectSourceFolder, "*.cpp", SearchOption.AllDirectories);
+                    // C/C++
+                    files = Directory.GetFiles(Globals.ProjectSourceFolder, "*.cpp", SearchOption.AllDirectories).Concat(Directory.GetFiles(Globals.ProjectSourceFolder, "*.c", SearchOption.AllDirectories)).ToArray();
                     filesCount += files.Length;
                     foreach (var file in files)
                         FindNewKeysCpp(file, newKeys, allKeys);
-                    files = Directory.GetFiles(Globals.ProjectSourceFolder, "*.h", SearchOption.AllDirectories);
+                    files = Directory.GetFiles(Globals.ProjectSourceFolder, "*.h", SearchOption.AllDirectories).Concat(Directory.GetFiles(Globals.ProjectSourceFolder, "*.hpp", SearchOption.AllDirectories)).ToArray();;
                     filesCount += files.Length;
                     foreach (var file in files)
                         FindNewKeysCpp(file, newKeys, allKeys);

Source/Editor/CustomEditors/Dedicated/MeshReferenceEditor.cs

@@ -164,11 +164,11 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 var button2Rect = new Rectangle(button1Rect.Right + 2, 1, 14, 14);
 
                 // Deselect
-                if (isSelected && button1Rect.Contains(ref location))
+                if (isSelected && button1Rect.Contains(location))
                     Value = new ModelInstanceActor.MeshReference { Actor = null, LODIndex = -1, MeshIndex = -1 };
 
                 // Picker dropdown menu
-                if ((isSelected ? button2Rect : button1Rect).Contains(ref location))
+                if ((isSelected ? button2Rect : button1Rect).Contains(location))
                     ShowDropDownMenu();
 
                 return base.OnMouseUp(location, button);

Source/Editor/CustomEditors/Dedicated/ModelPrefabEditor.cs

@@ -40,7 +40,7 @@ public class ModelPrefabEditor : GenericEditor
             if (prefab)
             {
                 var prefabObjectId = modelPrefab.PrefabObjectID;
-                var prefabObject = prefab.GetDefaultInstance(ref prefabObjectId);
+                var prefabObject = prefab.GetDefaultInstance(prefabObjectId);
                 if (prefabObject.PrefabID == _prefabId)
                     break;
                 _prefabId = prefabObject.PrefabID;

Source/Editor/CustomEditors/Dedicated/ScriptsEditor.cs

@@ -914,9 +914,11 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 // Remove drop down arrows and containment lines if no objects in the group
                 if (group.Children.Count == 0)
                 {
+                    group.Panel.Close();
                     group.Panel.ArrowImageOpened = null;
                     group.Panel.ArrowImageClosed = null;
                     group.Panel.EnableContainmentLines = false;
+                    group.Panel.CanOpenClose = false;
                 }
 
                 // Scripts arrange bar

Source/Editor/CustomEditors/Dedicated/SkyLightEditor.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Wojciech Figat. All rights reserved.
 
 using FlaxEngine;
+using FlaxEngine.GUI;
 
 namespace FlaxEditor.CustomEditors.Dedicated
 {
@@ -19,8 +20,9 @@ namespace FlaxEditor.CustomEditors.Dedicated
             if (Values.HasDifferentTypes == false)
             {
                 // Add 'Bake' button
-                layout.Space(10);
-                var button = layout.Button("Bake");
+                var group = layout.Group("Bake");
+                group.Panel.ItemsMargin = new Margin(Utilities.Constants.UIMargin * 2);
+                var button = group.Button("Bake");
                 button.Button.Clicked += BakeButtonClicked;
             }
         }

Source/Editor/CustomEditors/Editors/AssetRefEditor.cs

@@ -123,6 +123,8 @@ namespace FlaxEditor.CustomEditors.Editors
         {
             base.Refresh();
 
+            if (Picker == null)
+                return;
             var differentValues = HasDifferentValues;
             Picker.DifferentValues = differentValues;
             if (!differentValues)
@@ -190,7 +192,7 @@ namespace FlaxEditor.CustomEditors.Editors
 
             public override bool OnMouseDown(Float2 location, MouseButton button)
             {
-                if (DropdownRect.Contains(ref location))
+                if (DropdownRect.Contains(location))
                 {
                     Focus();
                     ShowPicker();
@@ -204,7 +206,7 @@ namespace FlaxEditor.CustomEditors.Editors
             {
                 base.OnMouseMove(location);
 
-                if (DropdownRect.Contains(ref location))
+                if (DropdownRect.Contains(location))
                     Cursor = CursorType.Default;
                 else
                     Cursor = CursorType.IBeam;

Source/Editor/CustomEditors/Editors/CollectionEditor.cs

@@ -155,7 +155,7 @@ namespace FlaxEditor.CustomEditors.Editors
             /// <inheritdoc />
             public override bool OnMouseDown(Float2 location, MouseButton button)
             {
-                if (button == MouseButton.Left && _arrangeButtonRect.Contains(ref location))
+                if (button == MouseButton.Left && _arrangeButtonRect.Contains(location))
                 {
                     _arrangeButtonInUse = true;
                     Focus();
@@ -371,7 +371,7 @@ namespace FlaxEditor.CustomEditors.Editors
             /// <inheritdoc />
             public override bool OnMouseDown(Float2 location, MouseButton button)
             {
-                if (button == MouseButton.Left && _arrangeButtonRect.Contains(ref location))
+                if (button == MouseButton.Left && _arrangeButtonRect.Contains(location))
                 {
                     _arrangeButtonInUse = true;
                     Focus();
@@ -650,7 +650,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 panel.Panel.Size = new Float2(0, 18);
                 panel.Panel.Margin = new Margin(0, 0, Utilities.Constants.UIMargin, 0);
 
-                var removeButton = panel.Button("-", "Remove the last item");
+                var removeButton = panel.Button("-", "Remove the last item.");
                 removeButton.Button.Size = new Float2(16, 16);
                 removeButton.Button.Enabled = size > _minCount;
                 removeButton.Button.AnchorPreset = AnchorPresets.TopRight;
@@ -661,7 +661,7 @@ namespace FlaxEditor.CustomEditors.Editors
                     Resize(Count - 1);
                 };
 
-                var addButton = panel.Button("+", "Add a new item");
+                var addButton = panel.Button("+", "Add a new item.");
                 addButton.Button.Size = new Float2(16, 16);
                 addButton.Button.Enabled = (!NotNullItems || size > 0) && size < _maxCount;
                 addButton.Button.AnchorPreset = AnchorPresets.TopRight;

Source/Editor/CustomEditors/Editors/FlaxObjectRefEditor.cs

@@ -321,11 +321,11 @@ namespace FlaxEditor.CustomEditors.Editors
             var button2Rect = new Rectangle(button1Rect.Right + 2, 1, 14, 14);
 
             // Deselect
-            if (_value != null && button1Rect.Contains(ref location))
+            if (_value != null && button1Rect.Contains(location))
                 Value = null;
 
             // Picker dropdown menu
-            if (_supportsPickDropDown && (isSelected ? button2Rect : button1Rect).Contains(ref location))
+            if (_supportsPickDropDown && (isSelected ? button2Rect : button1Rect).Contains(location))
             {
                 ShowDropDownMenu();
                 return true;

Source/Editor/CustomEditors/Editors/GenericEditor.cs

@@ -247,7 +247,7 @@ namespace FlaxEditor.CustomEditors.Editors
         /// <returns>The items.</returns>
         protected virtual List<ItemInfo> GetItemsForType(ScriptType type)
         {
-            return GetItemsForType(type, type.IsClass, true);
+            return GetItemsForType(type, type.IsClass, true, true);
         }
 
         /// <summary>
@@ -273,10 +273,14 @@ namespace FlaxEditor.CustomEditors.Editors
                     var attributes = p.GetAttributes(true);
                     var showInEditor = attributes.Any(x => x is ShowInEditorAttribute);
 
-                    // Skip properties without getter or setter
+                    // Skip properties without getter
                     if (!p.HasGet || (!p.HasSet && !showInEditor && !usePropertiesWithoutSetter))
                         continue;
 
+                    // Skip getter-only properties declared in built-in types
+                    if (!p.HasSet && usePropertiesWithoutSetter && p.Type.DeclaringType.Assembly == typeof(Editor).Assembly)
+                        continue;
+
                     // Skip hidden fields, handle special attributes
                     if ((!p.IsPublic && !showInEditor) || attributes.Any(x => x is HideInEditorAttribute))
                         continue;

Source/Editor/CustomEditors/Editors/TypeEditor.cs

@@ -104,7 +104,7 @@ namespace FlaxEditor.CustomEditors.Editors
         public event Action<TypePickerControl> TypePickerValueChanged;
 
         /// <summary>
-        /// The custom callback for types validation. Cane be used to implement a rule for types to pick.
+        /// The custom callback for types validation. Can be used to implement a rule for types to pick.
         /// </summary>
         public Func<ScriptType, bool> CheckValid;
 
@@ -219,11 +219,11 @@ namespace FlaxEditor.CustomEditors.Editors
             var button2Rect = new Rectangle(button1Rect.Right + 2, 1, 14, 14);
 
             // Deselect
-            if (_value && button1Rect.Contains(ref location) && _type == ScriptType.Null)
+            if (_value && button1Rect.Contains(location) && _type == ScriptType.Null)
                 Value = ScriptType.Null;
 
             // Picker dropdown menu
-            if ((isSelected && _type == ScriptType.Null ? button2Rect : button1Rect).Contains(ref location))
+            if ((isSelected && _type == ScriptType.Null ? button2Rect : button1Rect).Contains(location))
                 ShowDropDownMenu();
 
             return base.OnMouseUp(location, button);
@@ -353,7 +353,13 @@ namespace FlaxEditor.CustomEditors.Editors
                     }
                     if (!string.IsNullOrEmpty(typeReference.CheckMethod))
                     {
-                        var parentType = ParentEditor.Values[0].GetType();
+                        var parentEditor = ParentEditor;
+                        // Find actual parent editor if parent editor is collection editor
+                        while (parentEditor.GetType().IsAssignableTo(typeof(CollectionEditor)))
+                            parentEditor = parentEditor.ParentEditor;
+                            
+                        var parentType = parentEditor.Values[0].GetType();
+
                         var method = parentType.GetMethod(typeReference.CheckMethod, BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
                         if (method != null)
                         {

Source/Editor/Editor.cpp

@@ -526,6 +526,23 @@ int32 Editor::LoadProduct()
             return 12;
     }
 
+    // Get the last opened project path
+    String localCachePath;
+    FileSystem::GetSpecialFolderPath(SpecialFolder::AppData, localCachePath);
+    String editorConfigPath = localCachePath / TEXT("Flax");
+    String lastProjectSettingPath = editorConfigPath / TEXT("LastProject.txt");
+    if (!FileSystem::DirectoryExists(editorConfigPath))
+        FileSystem::CreateDirectory(editorConfigPath);
+    String lastProjectPath;
+    if (FileSystem::FileExists(lastProjectSettingPath))
+        File::ReadAllText(lastProjectSettingPath, lastProjectPath);
+    if (!FileSystem::DirectoryExists(lastProjectPath))
+        lastProjectPath = String::Empty;
+
+    // Try to open the last project when requested
+    if (projectPath.IsEmpty() && CommandLine::Options.LastProject.IsTrue() && !lastProjectPath.IsEmpty())
+        projectPath = lastProjectPath;
+
     // Missing project case
     if (projectPath.IsEmpty())
     {
@@ -541,7 +558,7 @@ int32 Editor::LoadProduct()
         Array<String> files;
         if (FileSystem::ShowOpenFileDialog(
             nullptr,
-            StringView::Empty,
+            lastProjectPath,
             TEXT("Project files (*.flaxproj)\0*.flaxproj\0All files (*.*)\0*.*\0"),
             false,
             TEXT("Select project to open in Editor"),
@@ -625,6 +642,10 @@ int32 Editor::LoadProduct()
         }
     }
 
+    // Update the last opened project path
+    if (lastProjectPath.Compare(Project->ProjectFolderPath) != 0)
+        File::WriteAllText(lastProjectSettingPath, Project->ProjectFolderPath, Encoding::UTF8);
+
     return 0;
 }
 

Source/Editor/Editor.cs

@@ -1056,7 +1056,7 @@ namespace FlaxEditor
             if (actor)
             {
                 Internal_GetEditorBoxWithChildren(FlaxEngine.Object.GetUnmanagedPtr(actor), out var box);
-                BoundingSphere.FromBox(ref box, out sphere);
+                BoundingSphere.FromBox(box, out sphere);
                 if (sphere == BoundingSphere.Empty)
                     sphere = new BoundingSphere(actor.Position, sphere.Radius);
                 sphere.Radius = Math.Max(sphere.Radius, 15.0f);
@@ -1390,6 +1390,7 @@ namespace FlaxEditor
         public void BuildAllMeshesSDF()
         {
             var models = new List<Model>();
+            var forceRebuild = Input.GetKey(KeyboardKeys.F);
             Scene.ExecuteOnGraph(node =>
             {
                 if (node is StaticModelNode staticModelNode && staticModelNode.Actor is StaticModel staticModel)
@@ -1399,7 +1400,7 @@ namespace FlaxEditor
                         model != null &&
                         !models.Contains(model) &&
                         !model.IsVirtual &&
-                        model.SDF.Texture == null)
+                        (forceRebuild || model.SDF.Texture == null))
                     {
                         models.Add(model);
                     }
@@ -1412,7 +1413,17 @@ namespace FlaxEditor
                 {
                     var model = models[i];
                     Log($"[{i}/{models.Count}] Generating SDF for {model}");
-                    if (!model.GenerateSDF())
+                    float resolutionScale = 1.0f, backfacesThreshold = 0.6f;
+                    int lodIndex = 6;
+                    bool useGPU = true;
+                    var sdf = model.SDF;
+                    if (sdf.Texture != null)
+                    {
+                        // Preserve options set on this model
+                        resolutionScale = sdf.ResolutionScale;
+                        lodIndex = sdf.LOD;
+                    }
+                    if (!model.GenerateSDF(resolutionScale, lodIndex, true, backfacesThreshold, useGPU))
                         model.Save();
                 }
             });
@@ -1587,7 +1598,7 @@ namespace FlaxEditor
                 if (dockedTo != null && dockedTo.SelectedTab != gameWin && dockedTo.SelectedTab != null)
                     result = dockedTo.SelectedTab.Size;
                 else
-                    result = gameWin.Viewport.Size;
+                    result = gameWin.Viewport.ContentSize;
 
                 result *= root.DpiScale;
                 result = Float2.Round(result);

Source/Editor/GUI/AssetPicker.cs

@@ -96,7 +96,7 @@ namespace FlaxEditor.GUI
         private void DoDrag()
         {
             // Do the drag drop operation if has selected element
-            if (new Rectangle(Float2.Zero, Size).Contains(ref _mouseDownPos))
+            if (new Rectangle(Float2.Zero, Size).Contains(_mouseDownPos))
             {
                 if (Validator.SelectedAsset != null)
                     DoDragDrop(DragAssets.GetDragData(Validator.SelectedAsset));

Source/Editor/GUI/ContextMenu/ContextMenuBase.cs

@@ -1,7 +1,10 @@
-#if PLATFORM_WINDOWS
+#if PLATFORM_WINDOWS || PLATFORM_SDL
 #define USE_IS_FOREGROUND
 #else
 #endif
+#if PLATFORM_SDL
+#define USE_SDL_WORKAROUNDS
+#endif
 // Copyright (c) Wojciech Figat. All rights reserved.
 
 using System.Collections.Generic;
@@ -122,7 +125,7 @@ namespace FlaxEditor.GUI.ContextMenu
         }
 
         /// <summary>
-        /// Shows the empty menu popup o na screen.
+        /// Shows the empty menu popup on a screen.
         /// </summary>
         /// <param name="control">The target control.</param>
         /// <param name="area">The target control area to cover.</param>
@@ -257,7 +260,9 @@ namespace FlaxEditor.GUI.ContextMenu
                 desc.AllowMaximize = false;
                 desc.AllowDragAndDrop = false;
                 desc.IsTopmost = true;
-                desc.IsRegularWindow = false;
+                desc.Type = WindowType.Popup;
+                desc.Parent = parentWin.Window;
+                desc.Title = "ContextMenu";
                 desc.HasSizingFrame = false;
                 OnWindowCreating(ref desc);
                 _window = Platform.CreateWindow(ref desc);
@@ -266,6 +271,12 @@ namespace FlaxEditor.GUI.ContextMenu
                     _window.GotFocus += OnWindowGotFocus;
                     _window.LostFocus += OnWindowLostFocus;
                 }
+                
+#if USE_IS_FOREGROUND && USE_SDL_WORKAROUNDS
+                // The focus between popup and parent windows doesn't change, force hide the popup when clicked on parent
+                parentWin.Window.MouseDown += OnWindowMouseDown;
+                _window.Closed += () => parentWin.Window.MouseDown -= OnWindowMouseDown;
+#endif
 
                 // Attach to the window
                 _parentCM = parent as ContextMenuBase;
@@ -441,6 +452,17 @@ namespace FlaxEditor.GUI.ContextMenu
             }
         }
 
+#if USE_SDL_WORKAROUNDS
+        private void OnWindowGotFocus()
+        {
+        }
+        
+        private void OnWindowMouseDown(ref Float2 mousePosition, MouseButton button, ref bool handled)
+        {
+            // The user clicked outside the popup window
+            Hide();
+        }
+#else
         private void OnWindowGotFocus()
         {
             var child = _childCM;
@@ -454,6 +476,7 @@ namespace FlaxEditor.GUI.ContextMenu
                 });
             }
         }
+#endif
 
         private void OnWindowLostFocus()
         {
@@ -552,7 +575,12 @@ namespace FlaxEditor.GUI.ContextMenu
             // Let root context menu to check if none of the popup windows
             if (_parentCM == null && UseVisibilityControl && !IsForeground)
             {
+#if USE_SDL_WORKAROUNDS
+                if (!IsMouseOver)
+                    Hide();
+#else
                 Hide();
+#endif
             }
         }
 #endif

Source/Editor/GUI/CurveEditor.Contents.cs

@@ -62,7 +62,7 @@ namespace FlaxEditor.GUI
                 for (int i = 0; i < children.Count; i++)
                 {
                     if (children[i] is KeyframePoint p)
-                        p.IsSelected = p.Bounds.Intersects(ref selectionRect);
+                        p.IsSelected = p.Bounds.Intersects(selectionRect);
                 }
                 _editor.UpdateTangents();
             }
@@ -85,7 +85,7 @@ namespace FlaxEditor.GUI
             internal void OnMove(Float2 location)
             {
                 // Skip updating keyframes until move actual starts to be meaningful
-                if (Float2.Distance(ref _movingSelectionStartPosLock, ref location) < 1.5f)
+                if (Float2.Distance(_movingSelectionStartPosLock, location) < 1.5f)
                     return;
                 _movingSelectionStartPosLock = Float2.Minimum;
 

Source/Editor/GUI/CurveEditor.cs

@@ -689,8 +689,8 @@ namespace FlaxEditor.GUI
                 if (selectedOnly && !point.IsSelected)
                     continue;
                 var pos = point.Point;
-                Float2.Min(ref posMin, ref pos, out posMin);
-                Float2.Max(ref posMax, ref pos, out posMax);
+                Float2.Min(posMin, pos, out posMin);
+                Float2.Max(posMax, pos, out posMax);
             }
 
             // Apply margin around the area
@@ -703,16 +703,16 @@ namespace FlaxEditor.GUI
             PointFromKeyframesToContents(ref posMin, ref viewRect);
             PointFromKeyframesToContents(ref posMax, ref viewRect);
             var tmp = posMin;
-            Float2.Min(ref posMin, ref posMax, out posMin);
-            Float2.Max(ref posMax, ref tmp, out posMax);
+            Float2.Min(posMin, posMax, out posMin);
+            Float2.Max(posMax, tmp, out posMax);
             var contentsSize = posMax - posMin;
 
             // Convert from Contents to Main Panel
             posMin = _contents.PointToParent(posMin);
             posMax = _contents.PointToParent(posMax);
             tmp = posMin;
-            Float2.Min(ref posMin, ref posMax, out posMin);
-            Float2.Max(ref posMax, ref tmp, out posMax);
+            Float2.Min(posMin, posMax, out posMin);
+            Float2.Max(posMax, tmp, out posMax);
 
             // Update zoom (leave unchanged when focusing a single point)
             var zoomMask = EnableZoom;
@@ -941,7 +941,7 @@ namespace FlaxEditor.GUI
             {
                 SetupGrid(out var min, out var max, out var pixelRange);
 
-                Render2D.PushClip(ref viewRect);
+                Render2D.PushClip(viewRect);
 
                 if ((ShowAxes & UseMode.Vertical) == UseMode.Vertical)
                     DrawAxis(Float2.UnitX, viewRect, min.X, max.X, pixelRange.X);
@@ -954,7 +954,7 @@ namespace FlaxEditor.GUI
             // Draw curve
             if (!_showCollapsed)
             {
-                Render2D.PushClip(ref rect);
+                Render2D.PushClip(rect);
                 DrawCurve(ref viewRect);
                 Render2D.PopClip();
             }

Source/Editor/GUI/Dialogs/ColorPickerDialog.cs

@@ -326,8 +326,11 @@ namespace FlaxEditor.GUI.Dialogs
             // Update eye dropper tool
             if (_activeEyedropper)
             {
+                // Try reading the color under the cursor in realtime if supported by the platform
                 Float2 mousePosition = Platform.MousePosition;
-                SelectedColor = ScreenUtilities.GetColorAt(mousePosition);
+                Color color = ScreenUtilities.GetColorAt(mousePosition);
+                if (color != Color.Transparent)
+                    SelectedColor = color;
             }
         }
 

Source/Editor/GUI/Docking/DockHintWindow.cs

@@ -1,545 +0,0 @@
-// Copyright (c) Wojciech Figat. All rights reserved.
-
-using System;
-using FlaxEngine;
-using FlaxEngine.GUI;
-
-namespace FlaxEditor.GUI.Docking
-{
-    /// <summary>
-    /// Helper class used to handle docking windows dragging and docking.
-    /// </summary>
-    public class DockHintWindow
-    {
-        private FloatWindowDockPanel _toMove;
-
-        private Float2 _dragOffset;
-        private Float2 _defaultWindowSize;
-        private Rectangle _rectDock;
-        private Rectangle _rectWindow;
-        private Float2 _mouse;
-        private DockState _toSet;
-        private DockPanel _toDock;
-        private bool _lateDragOffsetUpdate;
-
-        private Rectangle _rLeft, _rRight, _rBottom, _rUpper, _rCenter;
-
-        private DockHintWindow(FloatWindowDockPanel toMove)
-        {
-            _toMove = toMove;
-            _toSet = DockState.Float;
-            var window = toMove.Window.Window;
-
-            // Remove focus from drag target
-            _toMove.Focus();
-            _toMove.Defocus();
-
-            // Focus window
-            window.Focus();
-
-            // Check if window is maximized and restore window.
-            if (window.IsMaximized)
-            {
-                // Restore window and set position to mouse.
-                var mousePos = window.MousePosition;
-                var previousSize = window.Size;
-                window.Restore();
-                window.Position = Platform.MousePosition - mousePos * window.Size / previousSize;
-            }
-
-            // Calculate dragging offset and move window to the destination position
-            var mouseScreenPosition = Platform.MousePosition;
-
-            // If the _toMove window was not focused when initializing this window, the result vector only contains zeros
-            // and to prevent a failure, we need to perform an update for the drag offset at later time which will be done in the OnMouseMove event handler.
-            if (mouseScreenPosition != Float2.Zero)
-                CalculateDragOffset(mouseScreenPosition);
-            else
-                _lateDragOffsetUpdate = true;
-
-            // Get initial size
-            _defaultWindowSize = window.Size;
-
-            // Init proxy window
-            Proxy.Init(ref _defaultWindowSize);
-
-            // Bind events
-            Proxy.Window.MouseUp += OnMouseUp;
-            Proxy.Window.MouseMove += OnMouseMove;
-            Proxy.Window.LostFocus += OnLostFocus;
-
-            // Start tracking mouse
-            Proxy.Window.StartTrackingMouse(false);
-
-            // Update window GUI
-            Proxy.Window.GUI.PerformLayout();
-
-            // Update rectangles
-            UpdateRects();
-
-            // Hide base window
-            window.Hide();
-
-            // Enable hit window presentation
-            Proxy.Window.RenderingEnabled = true;
-            Proxy.Window.Show();
-            Proxy.Window.Focus();
-        }
-
-        /// <summary>
-        /// Releases unmanaged and - optionally - managed resources.
-        /// </summary>
-        public void Dispose()
-        {
-            // End tracking mouse
-            Proxy.Window.EndTrackingMouse();
-
-            // Disable rendering
-            Proxy.Window.RenderingEnabled = false;
-
-            // Unbind events
-            Proxy.Window.MouseUp -= OnMouseUp;
-            Proxy.Window.MouseMove -= OnMouseMove;
-            Proxy.Window.LostFocus -= OnLostFocus;
-
-            // Hide the proxy
-            Proxy.Hide();
-
-            if (_toMove == null)
-                return;
-
-            // Check if window won't be docked
-            if (_toSet == DockState.Float)
-            {
-                var window = _toMove.Window?.Window;
-                if (window == null)
-                    return;
-                var mouse = Platform.MousePosition;
-
-                // Move base window
-                window.Position = mouse - _dragOffset;
-
-                // Show base window
-                window.Show();
-            }
-            else
-            {
-                bool hasNoChildPanels = _toMove.ChildPanelsCount == 0;
-
-                // Check if window has only single tab
-                if (hasNoChildPanels && _toMove.TabsCount == 1)
-                {
-                    // Dock window
-                    _toMove.GetTab(0).Show(_toSet, _toDock);
-                }
-                // Check if dock as tab and has no child panels
-                else if (hasNoChildPanels && _toSet == DockState.DockFill)
-                {
-                    // Dock all tabs
-                    while (_toMove.TabsCount > 0)
-                    {
-                        _toMove.GetTab(0).Show(DockState.DockFill, _toDock);
-                    }
-                }
-                else
-                {
-                    var selectedTab = _toMove.SelectedTab;
-
-                    // Dock the first tab into the target location
-                    var firstTab = _toMove.GetTab(0);
-                    firstTab.Show(_toSet, _toDock);
-
-                    // Dock rest of the tabs
-                    while (_toMove.TabsCount > 0)
-                    {
-                        _toMove.GetTab(0).Show(DockState.DockFill, firstTab);
-                    }
-
-                    // Keep selected tab being selected
-                    selectedTab?.SelectTab();
-                }
-
-                // Focus target window
-                _toDock.Root.Focus();
-            }
-
-            _toMove = null;
-        }
-
-        /// <summary>
-        /// Creates the new dragging hit window.
-        /// </summary>
-        /// <param name="toMove">Floating dock panel to move.</param>
-        /// <returns>The dock hint window object.</returns>
-        public static DockHintWindow Create(FloatWindowDockPanel toMove)
-        {
-            if (toMove == null)
-                throw new ArgumentNullException();
-
-            return new DockHintWindow(toMove);
-        }
-
-        /// <summary>
-        /// Creates the new dragging hit window.
-        /// </summary>
-        /// <param name="toMove">Dock window to move.</param>
-        /// <returns>The dock hint window object.</returns>
-        public static DockHintWindow Create(DockWindow toMove)
-        {
-            if (toMove == null)
-                throw new ArgumentNullException();
-
-            // Show floating
-            toMove.ShowFloating();
-
-            // Move window to the mouse position (with some offset for caption bar)
-            var window = (WindowRootControl)toMove.Root;
-            var mouse = Platform.MousePosition;
-            window.Window.Position = mouse - new Float2(8, 8);
-
-            // Get floating panel
-            var floatingPanelToMove = window.GetChild(0) as FloatWindowDockPanel;
-
-            return new DockHintWindow(floatingPanelToMove);
-        }
-
-        /// <summary>
-        /// Calculates window rectangle in the dock window.
-        /// </summary>
-        /// <param name="state">Window dock state.</param>
-        /// <param name="rect">Dock panel rectangle.</param>
-        /// <returns>Calculated window rectangle.</returns>
-        public static Rectangle CalculateDockRect(DockState state, ref Rectangle rect)
-        {
-            Rectangle result = rect;
-            switch (state)
-            {
-            case DockState.DockFill:
-                result.Location.Y += Editor.Instance.Options.Options.Interface.TabHeight;
-                result.Size.Y -= Editor.Instance.Options.Options.Interface.TabHeight;
-                break;
-            case DockState.DockTop:
-                result.Size.Y *= DockPanel.DefaultSplitterValue;
-                break;
-            case DockState.DockLeft:
-                result.Size.X *= DockPanel.DefaultSplitterValue;
-                break;
-            case DockState.DockBottom:
-                result.Location.Y += result.Size.Y * (1 - DockPanel.DefaultSplitterValue);
-                result.Size.Y *= DockPanel.DefaultSplitterValue;
-                break;
-            case DockState.DockRight:
-                result.Location.X += result.Size.X * (1 - DockPanel.DefaultSplitterValue);
-                result.Size.X *= DockPanel.DefaultSplitterValue;
-                break;
-            }
-            return result;
-        }
-
-        private void CalculateDragOffset(Float2 mouseScreenPosition)
-        {
-            var baseWinPos = _toMove.Window.Window.Position;
-            _dragOffset = mouseScreenPosition - baseWinPos;
-        }
-
-        private void UpdateRects()
-        {
-            // Cache mouse position
-            _mouse = Platform.MousePosition;
-
-            // Check intersection with any dock panel
-            var uiMouse = _mouse;
-            _toDock = _toMove.MasterPanel.HitTest(ref uiMouse, _toMove);
-
-            // Check dock state to use
-            bool showProxyHints = _toDock != null;
-            bool showBorderHints = showProxyHints;
-            bool showCenterHint = showProxyHints;
-            if (showProxyHints)
-            {
-                // If moved window has not only tabs but also child panels disable docking as tab
-                if (_toMove.ChildPanelsCount > 0)
-                    showCenterHint = false;
-
-                // Disable docking windows with one or more dock panels inside
-                if (_toMove.ChildPanelsCount > 0)
-                    showBorderHints = false;
-
-                // Get dock area
-                _rectDock = _toDock.DockAreaBounds;
-
-                // Cache dock rectangles
-                var size = _rectDock.Size;
-                var offset = _rectDock.Location;
-                var borderMargin = 4.0f;
-                var hintWindowsSize = Proxy.HintWindowsSize * Platform.DpiScale;
-                var hintWindowsSize2 = hintWindowsSize * 0.5f;
-                var centerX = size.X * 0.5f;
-                var centerY = size.Y * 0.5f;
-                _rUpper = new Rectangle(centerX - hintWindowsSize2, borderMargin, hintWindowsSize, hintWindowsSize) + offset;
-                _rBottom = new Rectangle(centerX - hintWindowsSize2, size.Y - hintWindowsSize - borderMargin, hintWindowsSize, hintWindowsSize) + offset;
-                _rLeft = new Rectangle(borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
-                _rRight = new Rectangle(size.X - hintWindowsSize - borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
-                _rCenter = new Rectangle(centerX - hintWindowsSize2, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
-
-                // Hit test
-                DockState toSet = DockState.Float;
-                if (showBorderHints)
-                {
-                    if (_rUpper.Contains(_mouse))
-                        toSet = DockState.DockTop;
-                    else if (_rBottom.Contains(_mouse))
-                        toSet = DockState.DockBottom;
-                    else if (_rLeft.Contains(_mouse))
-                        toSet = DockState.DockLeft;
-                    else if (_rRight.Contains(_mouse))
-                        toSet = DockState.DockRight;
-                }
-                if (showCenterHint && _rCenter.Contains(_mouse))
-                    toSet = DockState.DockFill;
-                _toSet = toSet;
-
-                // Show proxy hint windows
-                Proxy.Down.Position = _rBottom.Location;
-                Proxy.Left.Position = _rLeft.Location;
-                Proxy.Right.Position = _rRight.Location;
-                Proxy.Up.Position = _rUpper.Location;
-                Proxy.Center.Position = _rCenter.Location;
-            }
-            else
-            {
-                _toSet = DockState.Float;
-            }
-
-            // Update proxy hint windows visibility
-            Proxy.Down.IsVisible = showProxyHints & showBorderHints;
-            Proxy.Left.IsVisible = showProxyHints & showBorderHints;
-            Proxy.Right.IsVisible = showProxyHints & showBorderHints;
-            Proxy.Up.IsVisible = showProxyHints & showBorderHints;
-            Proxy.Center.IsVisible = showProxyHints & showCenterHint;
-
-            // Calculate proxy/dock/window rectangles
-            if (_toDock == null)
-            {
-                // Floating window over nothing
-                _rectWindow = new Rectangle(_mouse - _dragOffset, _defaultWindowSize);
-            }
-            else
-            {
-                if (_toSet == DockState.Float)
-                {
-                    // Floating window over dock panel
-                    _rectWindow = new Rectangle(_mouse - _dragOffset, _defaultWindowSize);
-                }
-                else
-                {
-                    // Use only part of the dock panel to show hint
-                    _rectWindow = CalculateDockRect(_toSet, ref _rectDock);
-                }
-            }
-
-            // Update proxy window
-            Proxy.Window.ClientBounds = _rectWindow;
-        }
-
-        private void OnMouseUp(ref Float2 location, MouseButton button, ref bool handled)
-        {
-            if (button == MouseButton.Left)
-            {
-                Dispose();
-            }
-        }
-
-        private void OnMouseMove(ref Float2 mousePos)
-        {
-            // Recalculate the drag offset because the current mouse screen position was invalid when we initialized the window
-            if (_lateDragOffsetUpdate)
-            {
-                // Calculate dragging offset and move window to the destination position
-                CalculateDragOffset(mousePos);
-
-                // Reset state
-                _lateDragOffsetUpdate = false;
-            }
-
-            UpdateRects();
-        }
-
-        private void OnLostFocus()
-        {
-            Dispose();
-        }
-
-        /// <summary>
-        /// Contains helper proxy windows shared across docking panels. They are used to visualize docking window locations.
-        /// </summary>
-        public static class Proxy
-        {
-            /// <summary>
-            /// The drag proxy window.
-            /// </summary>
-            public static Window Window;
-
-            /// <summary>
-            /// The left hint proxy window.
-            /// </summary>
-            public static Window Left;
-
-            /// <summary>
-            /// The right hint proxy window.
-            /// </summary>
-            public static Window Right;
-
-            /// <summary>
-            /// The up hint proxy window.
-            /// </summary>
-            public static Window Up;
-
-            /// <summary>
-            /// The down hint proxy window.
-            /// </summary>
-            public static Window Down;
-
-            /// <summary>
-            /// The center hint proxy window.
-            /// </summary>
-            public static Window Center;
-
-            /// <summary>
-            /// The hint windows size.
-            /// </summary>
-            public const float HintWindowsSize = 32.0f;
-
-            /// <summary>
-            /// Initializes the hit proxy windows. Those windows are used to indicate drag target areas (left, right, top, bottom, etc.).
-            /// </summary>
-            public static void InitHitProxy()
-            {
-                CreateProxy(ref Left, "DockHint.Left");
-                CreateProxy(ref Right, "DockHint.Right");
-                CreateProxy(ref Up, "DockHint.Up");
-                CreateProxy(ref Down, "DockHint.Down");
-                CreateProxy(ref Center, "DockHint.Center");
-            }
-
-            /// <summary>
-            /// Initializes the hint window.
-            /// </summary>
-            /// <param name="initSize">Initial size of the proxy window.</param>
-            public static void Init(ref Float2 initSize)
-            {
-                if (Window == null)
-                {
-                    var settings = CreateWindowSettings.Default;
-                    settings.Title = "DockHint.Window";
-                    settings.Size = initSize;
-                    settings.AllowInput = true;
-                    settings.AllowMaximize = false;
-                    settings.AllowMinimize = false;
-                    settings.HasBorder = false;
-                    settings.HasSizingFrame = false;
-                    settings.IsRegularWindow = false;
-                    settings.SupportsTransparency = true;
-                    settings.ShowInTaskbar = false;
-                    settings.ShowAfterFirstPaint = false;
-                    settings.IsTopmost = true;
-
-                    Window = Platform.CreateWindow(ref settings);
-                    Window.Opacity = 0.6f;
-                    Window.GUI.BackgroundColor = Style.Current.Selection;
-                    Window.GUI.AddChild<DragVisuals>();
-                }
-                else
-                {
-                    // Resize proxy
-                    Window.ClientSize = initSize;
-                }
-
-                InitHitProxy();
-            }
-
-            private sealed class DragVisuals : Control
-            {
-                public DragVisuals()
-                {
-                    AnchorPreset = AnchorPresets.StretchAll;
-                    Offsets = Margin.Zero;
-                }
-
-                public override void Draw()
-                {
-                    Render2D.DrawRectangle(new Rectangle(Float2.Zero, Size), Style.Current.SelectionBorder);
-                }
-            }
-
-            private static void CreateProxy(ref Window win, string name)
-            {
-                if (win != null)
-                    return;
-
-                var settings = CreateWindowSettings.Default;
-                settings.Title = name;
-                settings.Size = new Float2(HintWindowsSize * Platform.DpiScale);
-                settings.AllowInput = false;
-                settings.AllowMaximize = false;
-                settings.AllowMinimize = false;
-                settings.HasBorder = false;
-                settings.HasSizingFrame = false;
-                settings.IsRegularWindow = false;
-                settings.SupportsTransparency = true;
-                settings.ShowInTaskbar = false;
-                settings.ActivateWhenFirstShown = false;
-                settings.IsTopmost = true;
-                settings.ShowAfterFirstPaint = false;
-
-                win = Platform.CreateWindow(ref settings);
-                win.Opacity = 0.6f;
-                win.GUI.BackgroundColor = Style.Current.Selection;
-                win.GUI.AddChild<DragVisuals>();
-            }
-
-            /// <summary>
-            /// Hides proxy windows.
-            /// </summary>
-            public static void Hide()
-            {
-                HideProxy(ref Window);
-                HideProxy(ref Left);
-                HideProxy(ref Right);
-                HideProxy(ref Up);
-                HideProxy(ref Down);
-                HideProxy(ref Center);
-            }
-
-            private static void HideProxy(ref Window win)
-            {
-                if (win)
-                {
-                    win.Hide();
-                }
-            }
-
-            /// <summary>
-            /// Releases proxy data and windows.
-            /// </summary>
-            public static void Dispose()
-            {
-                DisposeProxy(ref Window);
-                DisposeProxy(ref Left);
-                DisposeProxy(ref Right);
-                DisposeProxy(ref Up);
-                DisposeProxy(ref Down);
-                DisposeProxy(ref Center);
-            }
-
-            private static void DisposeProxy(ref Window win)
-            {
-                if (win)
-                {
-                    win.Close(ClosingReason.User);
-                    win = null;
-                }
-            }
-        }
-    }
-}

Source/Editor/GUI/Docking/DockPanelProxy.cs

@@ -19,11 +19,7 @@ namespace FlaxEditor.GUI.Docking
         private float _tabHeight = Editor.Instance.Options.Options.Interface.TabHeight;
         private bool _useMinimumTabWidth = Editor.Instance.Options.Options.Interface.UseMinimumTabWidth;
         private float _minimumTabWidth = Editor.Instance.Options.Options.Interface.MinimumTabWidth;
-#if PLATFORM_WINDOWS
-        private readonly bool _hideTabForSingleTab = Editor.Instance.Options.Options.Interface.HideSingleTabWindowTabBars;
-#else
-        private readonly bool _hideTabForSingleTab = false;
-#endif
+        private readonly bool _hideTabForSingleTab = Utilities.Utils.HideSingleTabWindowTabBars();
 
         /// <summary>
         /// The is mouse down flag (left button).
@@ -54,6 +50,11 @@ namespace FlaxEditor.GUI.Docking
         /// The mouse position.
         /// </summary>
         public Float2 MousePosition = Float2.Minimum;
+        
+        /// <summary>
+        /// The mouse position.
+        /// </summary>
+        public Float2 MouseStartPosition = Float2.Minimum;
 
         /// <summary>
         /// The start drag asynchronous window.
@@ -196,7 +197,7 @@ namespace FlaxEditor.GUI.Docking
                 if (_panel.ChildPanelsCount == 0 && _panel.TabsCount == 1 && _panel.IsFloating)
                 {
                     // Create docking hint window but in an async manner
-                    DockHintWindow.Create(_panel as FloatWindowDockPanel);
+                    WindowDragHelper.StartDragging(_panel as FloatWindowDockPanel);
                 }
                 else
                 {
@@ -207,7 +208,7 @@ namespace FlaxEditor.GUI.Docking
                     _panel.SelectTab(index - 1);
 
                     // Create docking hint window
-                    DockHintWindow.Create(win);
+                    WindowDragHelper.StartDragging(win, _panel.RootWindow.Window);
                 }
             }
         }
@@ -393,6 +394,7 @@ namespace FlaxEditor.GUI.Docking
             if (IsSingleFloatingWindow)
                 return base.OnMouseDown(location, button);
             MouseDownWindow = GetTabAtPos(location, out IsMouseDownOverCross);
+            MouseStartPosition = location;
 
             // Check buttons
             if (button == MouseButton.Left)
@@ -479,6 +481,20 @@ namespace FlaxEditor.GUI.Docking
                         StartDrag(MouseDownWindow);
                     MouseDownWindow = null;
                 }
+                // Check if single tab is tried to be moved
+                else if (MouseDownWindow != null && _panel.TabsCount <= 1)
+                {
+                    if ((MousePosition - MouseStartPosition).Length > 3)
+                    {
+                        // Clear flag
+                        IsMouseLeftButtonDown = false;
+
+                        // Check tab under the mouse
+                        if (!IsMouseDownOverCross && MouseDownWindow != null)
+                            StartDrag(MouseDownWindow);
+                        MouseDownWindow = null;
+                    }
+                }
                 // Check if has more than one tab to change order
                 else if (MouseDownWindow != null && _panel.TabsCount > 1)
                 {

Source/Editor/GUI/Docking/DockWindow.cs

@@ -182,6 +182,25 @@ namespace FlaxEditor.GUI.Docking
         /// <param name="size">Window size, set <see cref="Float2.Zero"/> to use default.</param>
         /// <param name="position">Window location.</param>
         public void ShowFloating(Float2 location, Float2 size, WindowStartPosition position = WindowStartPosition.CenterParent)
+        {
+            CreateFloating(location, size, position, true);
+        }
+
+        /// <summary>
+        /// Creates the window in a floating state.
+        /// </summary>
+        public void CreateFloating()
+        {
+            CreateFloating(Float2.Zero, Float2.Zero);
+        }
+        /// <summary>
+        /// Creates the window in a floating state.
+        /// </summary>
+        /// <param name="location">Window location.</param>
+        /// <param name="size">Window size, set <see cref="Float2.Zero"/> to use default.</param>
+        /// <param name="position">Window location.</param>
+        /// <param name="showWindow">Window visibility.</param>
+        public void CreateFloating(Float2 location, Float2 size, WindowStartPosition position = WindowStartPosition.CenterParent, bool showWindow = false)
         {
             Undock();
 
@@ -199,14 +218,17 @@ namespace FlaxEditor.GUI.Docking
             windowGUI.UnlockChildrenRecursive();
             windowGUI.PerformLayout();
 
-            // Show
-            window.Show();
-            window.BringToFront();
-            window.Focus();
-            OnShow();
+            if (showWindow)
+            {
+                // Show
+                window.Show();
+                window.BringToFront();
+                window.Focus();
+                OnShow();
 
-            // Perform layout again
-            windowGUI.PerformLayout();
+                // Perform layout again
+                windowGUI.PerformLayout();
+            }
         }
 
         /// <summary>

Source/Editor/GUI/Docking/FloatWindowDockPanel.cs

@@ -11,6 +11,42 @@ namespace FlaxEditor.GUI.Docking
     /// <seealso cref="DockPanel" />
     public class FloatWindowDockPanel : DockPanel
     {
+        private class FloatWindowDecorations : WindowDecorations
+        {
+            private FloatWindowDockPanel _panel;
+            
+            public FloatWindowDecorations(FloatWindowDockPanel panel)
+            : base(panel.RootWindow)
+            {
+                _panel = panel;
+            }
+            
+            /// <inheritdoc />
+            public override bool OnMouseDown(Float2 location, MouseButton button)
+            {
+                if (Title.Bounds.Contains(location) && button == MouseButton.Left)
+                {
+                    _panel.BeginDrag();
+                    return true;
+                }
+                return base.OnMouseDown(location, button);
+            }
+
+#if !PLATFORM_WINDOWS
+            /// <inheritdoc />
+            protected override WindowHitCodes OnHitTest(ref Float2 mouse)
+            {
+                var hit = base.OnHitTest(ref mouse);
+                if (hit == WindowHitCodes.Caption)
+                {
+                    // Override the system behaviour when interacting with the caption area
+                    hit = WindowHitCodes.Client;
+                }
+                return hit;
+            }
+#endif
+        }
+
         private MasterDockPanel _masterPanel;
         private WindowRootControl _window;
 
@@ -40,6 +76,26 @@ namespace FlaxEditor.GUI.Docking
             Parent = window;
             _window.Window.Closing += OnClosing;
             _window.Window.LeftButtonHit += OnLeftButtonHit;
+            
+            if (Utilities.Utils.UseCustomWindowDecorations())
+            {
+                var decorations = Parent.AddChild(new FloatWindowDecorations(this));
+                decorations.SetAnchorPreset(AnchorPresets.HorizontalStretchTop, false);
+            }
+        }
+        
+        /// <inheritdoc />
+        protected override void PerformLayoutBeforeChildren()
+        {
+            base.PerformLayoutBeforeChildren();
+            
+            var decorations = Parent.GetChild<FloatWindowDecorations>();
+            if (decorations != null)
+            {
+                // Apply offset for the title bar
+                foreach (var child in Children)
+                    child.Bounds = child.Bounds with { Y = decorations.Height, Height = Parent.Height - decorations.Height };
+            }
         }
 
         /// <summary>
@@ -52,7 +108,7 @@ namespace FlaxEditor.GUI.Docking
                 return;
 
             // Create docking hint window
-            DockHintWindow.Create(this);
+            WindowDragHelper.StartDragging(this);
         }
 
         /// <summary>
@@ -71,22 +127,28 @@ namespace FlaxEditor.GUI.Docking
             settings.Title = title;
             settings.Size = size;
             settings.Position = location;
-            settings.MinimumSize = new Float2(1);
+            settings.MinimumSize = new Float2(200, 150);
             settings.MaximumSize = Float2.Zero; // Unlimited size
             settings.Fullscreen = false;
             settings.HasBorder = true;
-            settings.SupportsTransparency = false;
+            settings.SupportsTransparency = true;
             settings.ActivateWhenFirstShown = true;
             settings.AllowInput = true;
             settings.AllowMinimize = true;
             settings.AllowMaximize = true;
             settings.AllowDragAndDrop = true;
             settings.IsTopmost = false;
-            settings.IsRegularWindow = true;
+            settings.Type = WindowType.Regular;
             settings.HasSizingFrame = true;
             settings.ShowAfterFirstPaint = false;
             settings.ShowInTaskbar = true;
             settings.StartPosition = startPosition;
+            
+            if (Utilities.Utils.UseCustomWindowDecorations())
+            {
+                settings.HasBorder = false;
+                //settings.HasSizingFrame = false;
+            }
 
             // Create window
             return Platform.CreateWindow(ref settings);

Source/Editor/GUI/Docking/MasterDockPanel.cs

@@ -81,7 +81,6 @@ namespace FlaxEditor.GUI.Docking
         public DockPanel HitTest(ref Float2 position, FloatWindowDockPanel excluded)
         {
             // Check all floating windows
-            // TODO: gather windows order and take it into account when performing test
             for (int i = 0; i < FloatingPanels.Count; i++)
             {
                 var win = FloatingPanels[i];
@@ -94,9 +93,44 @@ namespace FlaxEditor.GUI.Docking
             }
 
             // Base
+            //if (!Root?.RootWindow.Window.IsFocused ?? false)
+            //    return null;
             return base.HitTest(ref position);
         }
 
+        /// <summary>
+        /// Performs hit test over dock panel.
+        /// </summary>
+        /// <param name="position">Window space position to test.</param>
+        /// <param name="excluded">Floating window to omit during searching (and all docked to that one).</param>
+        /// <param name="hitResults">Results of the hit test</param>
+        /// <returns>True if any dock panels were hit, otherwise false.</returns>
+        public bool HitTest(ref Float2 position, FloatWindowDockPanel excluded, out DockPanel[] hitResults)
+        {
+            // Check all floating windows
+            List<DockPanel> results = new(FloatingPanels.Count);
+            for (int i = 0; i < FloatingPanels.Count; i++)
+            {
+                var win = FloatingPanels[i];
+                if (win.Visible && win != excluded)
+                {
+                    var result = win.HitTest(ref position);
+                    if (result != null)
+                        results.Add(result);
+                }
+            }
+
+            // Base
+            //if (!Root?.RootWindow.Window.IsFocused ?? false)
+            //    return null;
+            var baseResult = base.HitTest(ref position);
+            if (baseResult != null)
+                results.Add(baseResult);
+
+            hitResults = results.ToArray();
+            return hitResults.Length > 0;
+        }
+
         internal void LinkWindow(DockWindow window)
         {
             // Add to the windows list

Source/Editor/GUI/Docking/WindowDragHelper.cs

@@ -0,0 +1,458 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+using System;
+using FlaxEngine;
+using FlaxEngine.GUI;
+
+namespace FlaxEditor.GUI.Docking
+{
+    /// <summary>
+    /// Helper class used to handle docking windows dragging and docking.
+    /// </summary>
+    public class WindowDragHelper
+    {
+        private FloatWindowDockPanel _toMove;
+
+        private Float2 _dragOffset;
+        private Rectangle _rectDock;
+        private Float2 _mouse;
+        private DockState _toSet;
+        private DockPanel _toDock;
+        private Window _dragSourceWindow;
+
+        private Rectangle _rLeft, _rRight, _rBottom, _rUpper, _rCenter;
+        private Control _dockHintDown, _dockHintUp, _dockHintLeft, _dockHintRight, _dockHintCenter;
+
+        /// <summary>
+        /// The hint control size.
+        /// </summary>
+        public const float HintControlSize = 32.0f;
+
+        /// <summary>
+        /// The opacity of the dragged window when hint controls are shown.
+        /// </summary>
+        public const float DragWindowOpacity = 0.4f;
+        
+        /// <summary>
+        /// Returns true if any windows are being dragged.
+        /// </summary>
+        public static bool IsDragActive { get; private set; }
+
+        private WindowDragHelper(FloatWindowDockPanel toMove, Window dragSourceWindow)
+        {
+            IsDragActive = true;
+            _toMove = toMove;
+            _toSet = DockState.Float;
+            var window = toMove.Window.Window;
+
+            // Bind events
+            FlaxEngine.Scripting.Update += OnUpdate;
+            window.MouseUp += OnMouseUp;
+            
+            // Update rectangles
+            UpdateRects(Platform.MousePosition);
+            
+            // Ensure the dragged window stays on top of every other window
+            window.IsAlwaysOnTop = true;
+
+            _dragSourceWindow = dragSourceWindow;
+            if (_dragSourceWindow != null) // Detaching a tab from existing window
+            {
+                _dragOffset = new Float2(window.Size.X / 2, 10.0f);
+                
+                _dragSourceWindow.MouseUp += OnMouseUp; // The mouse up event is sent to the source window on Windows
+
+                // TODO: when detaching tab in floating window (not main window), the drag source window is still main window?
+                var dragSourceWindowWayland = toMove.MasterPanel?.RootWindow.Window ?? Editor.Instance.Windows.MainWindow;
+                window.DoDragDrop(window.Title, _dragOffset, dragSourceWindowWayland);
+            }
+            else
+            {
+                _dragOffset = window.MousePosition;
+                window.DoDragDrop(window.Title, _dragOffset, window);
+            }
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        public void Dispose()
+        {
+            IsDragActive = false;
+            var window = _toMove?.Window?.Window;
+
+            // Unbind events
+            FlaxEngine.Scripting.Update -= OnUpdate;
+            if (window != null)
+                window.MouseUp -= OnMouseUp;
+            if (_dragSourceWindow != null)
+                _dragSourceWindow.MouseUp -= OnMouseUp;
+
+            RemoveDockHints();
+
+            if (_toMove == null)
+                return;
+
+            if (window != null)
+            {
+                window.Opacity = 1.0f;
+                window.IsAlwaysOnTop = false;
+                window.BringToFront();
+            }
+
+            // Check if window won't be docked
+            if (_toSet == DockState.Float)
+            {
+                if (window == null)
+                    return;
+
+                // Show base window
+                window.Show();
+            }
+            else
+            {
+                bool hasNoChildPanels = _toMove.ChildPanelsCount == 0;
+
+                // Check if window has only single tab
+                if (hasNoChildPanels && _toMove.TabsCount == 1)
+                {
+                    // Dock window
+                    _toMove.GetTab(0).Show(_toSet, _toDock);
+                }
+                // Check if dock as tab and has no child panels
+                else if (hasNoChildPanels && _toSet == DockState.DockFill)
+                {
+                    // Dock all tabs
+                    while (_toMove.TabsCount > 0)
+                    {
+                        _toMove.GetTab(0).Show(DockState.DockFill, _toDock);
+                    }
+                }
+                else
+                {
+                    var selectedTab = _toMove.SelectedTab;
+
+                    // Dock the first tab into the target location
+                    if (_toMove.TabsCount > 0)
+                    {
+                        var firstTab = _toMove.GetTab(0);
+                        firstTab.Show(_toSet, _toDock);
+
+                        // Dock rest of the tabs
+                        while (_toMove.TabsCount > 0)
+                        {
+                            _toMove.GetTab(0).Show(DockState.DockFill, firstTab);
+                        }
+                    }
+
+                    // Keep selected tab being selected
+                    selectedTab?.SelectTab();
+                }
+
+                // Focus target window
+                _toDock.Root.Focus();
+            }
+
+            _toMove = null;
+        }
+
+        /// <summary>
+        /// Start dragging a floating dock panel.
+        /// </summary>
+        /// <param name="toMove">Floating dock panel to move.</param>
+        /// <returns>The window drag helper object.</returns>
+        public static WindowDragHelper StartDragging(FloatWindowDockPanel toMove)
+        {
+            if (toMove == null)
+                throw new ArgumentNullException();
+
+            return new WindowDragHelper(toMove, null);
+        }
+
+        /// <summary>
+        /// Start dragging a docked panel into a floating window.
+        /// </summary>
+        /// <param name="toMove">Dock window to move.</param>
+        /// <param name="dragSourceWindow">The window where dragging started from.</param>
+        /// <returns>The window drag helper object.</returns>
+        public static WindowDragHelper StartDragging(DockWindow toMove, Window dragSourceWindow)
+        {
+            if (toMove == null)
+                throw new ArgumentNullException();
+
+            // Create floating window
+            toMove.CreateFloating();
+
+            // Get floating panel
+            var window = (WindowRootControl)toMove.Root;
+            var floatingPanelToMove = window.GetChild(0) as FloatWindowDockPanel;
+
+            return new WindowDragHelper(floatingPanelToMove, dragSourceWindow);
+        }
+
+        private sealed class DragVisuals : Control
+        {
+            public DragVisuals()
+            {
+                AnchorPreset = AnchorPresets.StretchAll;
+                Offsets = Margin.Zero;
+            }
+
+            public override void Draw()
+            {
+                base.Draw();
+                Render2D.DrawRectangle(new Rectangle(Float2.Zero, Size), Style.Current.SelectionBorder);
+            }
+        }
+
+        private void AddDockHints()
+        {
+            if (_toDock == null)
+                return;
+
+            if (_toDock.RootWindow.Window != _dragSourceWindow)
+                _toDock.RootWindow.Window.MouseUp += OnMouseUp;
+
+            _dockHintDown = AddHintControl(new Float2(0.5f, 1));
+            _dockHintUp = AddHintControl(new Float2(0.5f, 0));
+            _dockHintLeft = AddHintControl(new Float2(0, 0.5f));
+            _dockHintRight = AddHintControl(new Float2(1, 0.5f));
+            _dockHintCenter = AddHintControl(new Float2(0.5f, 0.5f));
+
+            Control AddHintControl(Float2 pivot)
+            {
+                DragVisuals hintControl = _toDock.AddChild<DragVisuals>();
+                hintControl.Size = new Float2(HintControlSize);
+                hintControl.BackgroundColor = Style.Current.Selection.AlphaMultiplied(0.6f);
+                hintControl.Pivot = pivot;
+                hintControl.PivotRelative = true;
+                return hintControl;
+            }
+        }
+        
+        private void RemoveDockHints()
+        {
+            if (_toDock == null)
+                return;
+
+            if (_toDock.RootWindow.Window != _dragSourceWindow)
+                _toDock.RootWindow.Window.MouseUp -= OnMouseUp;
+
+            _dockHintDown?.Parent.RemoveChild(_dockHintDown);
+            _dockHintUp?.Parent.RemoveChild(_dockHintUp);
+            _dockHintLeft?.Parent.RemoveChild(_dockHintLeft);
+            _dockHintRight?.Parent.RemoveChild(_dockHintRight);
+            _dockHintCenter?.Parent.RemoveChild(_dockHintCenter);
+            _dockHintDown = _dockHintUp = _dockHintLeft = _dockHintRight = _dockHintCenter = null;
+        }
+
+        private void UpdateRects(Float2 mousePos)
+        {
+            // Cache mouse position
+            _mouse = mousePos;
+
+            // Check intersection with any dock panel
+            DockPanel dockPanel = null;
+            if (_toMove.MasterPanel.HitTest(ref _mouse, _toMove, out var hitResults))
+            {
+                dockPanel = hitResults[0];
+
+                // Prefer panel which currently has focus
+                foreach (var hit in hitResults)
+                {
+                    if (hit.RootWindow.Window.IsFocused)
+                    {
+                        dockPanel = hit;
+                        break;
+                    }
+                }
+
+                // Prefer panel in the same window we hit earlier
+                if (dockPanel?.RootWindow != _toDock?.RootWindow)
+                {
+                    foreach (var hit in hitResults)
+                    {
+                        if (hit.RootWindow == _toDock?.RootWindow)
+                        {
+                            dockPanel = _toDock;
+                            break;
+                        }
+                    }
+                }
+            }
+            
+            if (dockPanel != _toDock)
+            {
+                RemoveDockHints();
+                _toDock = dockPanel;
+                AddDockHints();
+
+                // Make sure the all the dock hint areas are not under other windows
+                _toDock?.RootWindow.Window.BringToFront();
+                //_toDock?.RootWindow.Window.Focus();
+
+                // Make the dragged window transparent when dock hints are visible
+                _toMove.Window.Window.Opacity = _toDock == null ? 1.0f : DragWindowOpacity;
+            }
+            
+            // Check dock state to use
+            bool showProxyHints = _toDock != null;
+            bool showBorderHints = showProxyHints;
+            bool showCenterHint = showProxyHints;
+            Control hoveredHintControl = null;
+            Float2 hoveredSizeOverride = Float2.Zero;
+            if (showProxyHints)
+            {
+                // If moved window has not only tabs but also child panels disable docking as tab
+                if (_toMove.ChildPanelsCount > 0)
+                    showCenterHint = false;
+
+                // Disable docking windows with one or more dock panels inside
+                if (_toMove.ChildPanelsCount > 0)
+                    showBorderHints = false;
+
+                // Get dock area
+                _rectDock = _toDock.DockAreaBounds;
+
+                // Cache dock rectangles
+                var size = _rectDock.Size / Platform.DpiScale;
+                var offset = _toDock.PointFromScreen(_rectDock.Location);
+                var borderMargin = 4.0f;
+                var hintWindowsSize = HintControlSize;
+                var hintWindowsSize2 = hintWindowsSize * 0.5f;
+                var hintPreviewSize = new Float2(Math.Max(HintControlSize * 2, size.X * 0.5f), Math.Max(HintControlSize * 2, size.Y * 0.5f));
+                var centerX = size.X * 0.5f;
+                var centerY = size.Y * 0.5f;
+                _rUpper = new Rectangle(centerX - hintWindowsSize2, borderMargin, hintWindowsSize, hintWindowsSize) + offset;
+                _rBottom = new Rectangle(centerX - hintWindowsSize2, size.Y - hintWindowsSize - borderMargin, hintWindowsSize, hintWindowsSize) + offset;
+                _rLeft = new Rectangle(borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
+                _rRight = new Rectangle(size.X - hintWindowsSize - borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
+                _rCenter = new Rectangle(centerX - hintWindowsSize2, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
+
+                // Hit test, and calculate the approximation for filled area when hovered over the hint
+                DockState toSet = DockState.Float;
+                if (showBorderHints)
+                {
+                    if (_rUpper.Contains(_toDock.PointFromScreen(_mouse)))
+                    {
+                        toSet = DockState.DockTop;
+                        hoveredHintControl = _dockHintUp;
+                        hoveredSizeOverride = new Float2(size.X, hintPreviewSize.Y);
+                    }
+                    else if (_rBottom.Contains(_toDock.PointFromScreen(_mouse)))
+                    {
+                        toSet = DockState.DockBottom;
+                        hoveredHintControl = _dockHintDown;
+                        hoveredSizeOverride = new Float2(size.X, hintPreviewSize.Y);
+                    }
+                    else if (_rLeft.Contains(_toDock.PointFromScreen(_mouse)))
+                    {
+                        toSet = DockState.DockLeft;
+                        hoveredHintControl = _dockHintLeft;
+                        hoveredSizeOverride = new Float2(hintPreviewSize.X, size.Y);
+                    }
+                    else if (_rRight.Contains(_toDock.PointFromScreen(_mouse)))
+                    {
+                        toSet = DockState.DockRight;
+                        hoveredHintControl = _dockHintRight;
+                        hoveredSizeOverride = new Float2(hintPreviewSize.X, size.Y);
+                    }
+                }
+                if (showCenterHint && _rCenter.Contains(_toDock.PointFromScreen(_mouse)))
+                {
+                    toSet = DockState.DockFill;
+                    hoveredHintControl = _dockHintCenter;
+                    hoveredSizeOverride = new Float2(size.X, size.Y);
+                }
+
+                _toSet = toSet;
+            }
+            else
+            {
+                _toSet = DockState.Float;
+            }
+            
+            // Update sizes and opacity of hint controls
+            if (_toDock != null)
+            {
+                if (hoveredHintControl != _dockHintDown)
+                {
+                    _dockHintDown.Size = new Float2(HintControlSize);
+                    _dockHintDown.BackgroundColor = Style.Current.Selection.AlphaMultiplied(0.6f);
+                }
+                if (hoveredHintControl != _dockHintLeft)
+                {
+                    _dockHintLeft.Size = new Float2(HintControlSize);
+                    _dockHintLeft.BackgroundColor = Style.Current.Selection.AlphaMultiplied(0.6f);
+                }
+                if (hoveredHintControl != _dockHintRight)
+                {
+                    _dockHintRight.Size = new Float2(HintControlSize);
+                    _dockHintRight.BackgroundColor = Style.Current.Selection.AlphaMultiplied(0.6f);
+                }
+                if (hoveredHintControl != _dockHintUp)
+                {
+                    _dockHintUp.Size = new Float2(HintControlSize);
+                    _dockHintUp.BackgroundColor = Style.Current.Selection.AlphaMultiplied(0.6f);
+                }
+                if (hoveredHintControl != _dockHintCenter)
+                {
+                    _dockHintCenter.Size = new Float2(HintControlSize);
+                    _dockHintCenter.BackgroundColor = Style.Current.Selection.AlphaMultiplied(0.6f);
+                }
+
+                if (_toSet != DockState.Float)
+                {
+                    if (hoveredHintControl != null)
+                    {
+                        hoveredHintControl.BackgroundColor = Style.Current.Selection.AlphaMultiplied(1.0f);
+                        hoveredHintControl.Size = hoveredSizeOverride;
+                    }
+                }
+            }
+
+            // Update hint controls visibility and location
+            if (showProxyHints)
+            {
+                if (hoveredHintControl != _dockHintDown)
+                    _dockHintDown.Location = _rBottom.Location;
+                if (hoveredHintControl != _dockHintLeft)
+                    _dockHintLeft.Location = _rLeft.Location;
+                if (hoveredHintControl != _dockHintRight)
+                    _dockHintRight.Location = _rRight.Location;
+                if (hoveredHintControl != _dockHintUp)
+                    _dockHintUp.Location = _rUpper.Location;
+                if (hoveredHintControl != _dockHintCenter)
+                    _dockHintCenter.Location = _rCenter.Location;
+                
+                _dockHintDown.Visible = showProxyHints & showBorderHints;
+                _dockHintLeft.Visible = showProxyHints & showBorderHints;
+                _dockHintRight.Visible = showProxyHints & showBorderHints;
+                _dockHintUp.Visible = showProxyHints & showBorderHints;
+                _dockHintCenter.Visible = showProxyHints & showCenterHint;
+            }
+        }
+
+        private void OnMouseUp(ref Float2 location, MouseButton button, ref bool handled)
+        {
+            if (button == MouseButton.Left)
+                Dispose();
+        }
+
+        private void OnUpdate()
+        {
+            var mousePos = Platform.MousePosition;
+
+            if (_mouse != mousePos)
+                OnMouseMove(mousePos);
+        }
+        
+        private void OnMouseMove(Float2 mousePos)
+        {
+            if (_dragSourceWindow != null)
+                _toMove.Window.Window.Position = mousePos - _dragOffset;
+
+            UpdateRects(mousePos);
+        }
+    }
+}

Source/Editor/GUI/Input/SliderControl.cs

@@ -180,7 +180,7 @@ namespace FlaxEditor.GUI.Input
                     Focus();
                     float mousePosition = location.X;
 
-                    if (_thumbRect.Contains(ref location))
+                    if (_thumbRect.Contains(location))
                     {
                         // Start sliding
                         _isSliding = true;

Source/Editor/GUI/Input/ValueBox.cs

@@ -266,6 +266,7 @@ namespace FlaxEditor.GUI.Input
             return base.OnMouseDown(location, button);
         }
 
+#if !PLATFORM_SDL
         /// <inheritdoc />
         public override void OnMouseMove(Float2 location)
         {
@@ -292,13 +293,45 @@ namespace FlaxEditor.GUI.Input
             base.OnMouseMove(location);
         }
 
+#else
+
+        /// <inheritdoc />
+        public override void OnMouseMoveRelative(Float2 mouseMotion)
+        {
+            var location = Root.TrackingMouseOffset;
+            if (_isSliding)
+            {
+                // Update sliding
+                ApplySliding(Root.TrackingMouseOffset.X * _slideSpeed);
+                return;
+            }
+
+            // Update cursor type so user knows they can slide value
+            if (CanUseSliding && SlideRect.Contains(location) && !_isSliding)
+            {
+                Cursor = CursorType.SizeWE;
+                _cursorChanged = true;
+            }
+            else if (_cursorChanged && !_isSliding)
+            {
+                Cursor = CursorType.Default;
+                _cursorChanged = false;
+            }
+
+            base.OnMouseMoveRelative(mouseMotion);
+        }
+
+#endif
+
         /// <inheritdoc />
         public override bool OnMouseUp(Float2 location, MouseButton button)
         {
             if (button == MouseButton.Left && _isSliding)
             {
+#if !PLATFORM_SDL
                 // End sliding and return mouse to original location
                 RootWindow.MousePosition = _mouseClickedPosition;
+#endif
                 EndSliding();
                 return true;
             }

Source/Editor/GUI/MainMenu.cs

@@ -12,16 +12,6 @@ namespace FlaxEditor.GUI
     /// <seealso cref="FlaxEngine.GUI.ContainerControl" />
     public sealed class MainMenu : ContainerControl
     {
-#if PLATFORM_WINDOWS
-        private bool _useCustomWindowSystem;
-        private Image _icon;
-        private Label _title;
-        private Button _closeButton;
-        private Button _minimizeButton;
-        private Button _maximizeButton;
-        private LocalizedString _charChromeRestore, _charChromeMaximize;
-        private Window _window;
-#endif
         private MainMenuButton _selected;
 
         /// <summary>
@@ -60,200 +50,12 @@ namespace FlaxEditor.GUI
         /// <summary>
         /// Initializes a new instance of the <see cref="MainMenu"/> class.
         /// </summary>
-        /// <param name="mainWindow">The main window.</param>
-        public MainMenu(RootControl mainWindow)
+        public MainMenu()
         : base(0, 0, 0, 20)
         {
             AutoFocus = false;
             AnchorPreset = AnchorPresets.HorizontalStretchTop;
-
-#if PLATFORM_WINDOWS
-            _useCustomWindowSystem = !Editor.Instance.Options.Options.Interface.UseNativeWindowSystem;
-            if (_useCustomWindowSystem)
-            {
-                BackgroundColor = Style.Current.LightBackground;
-                Height = 28;
-
-                var windowIcon = FlaxEngine.Content.LoadAsyncInternal<Texture>(EditorAssets.WindowIcon);
-                FontAsset windowIconsFont = FlaxEngine.Content.LoadAsyncInternal<FontAsset>(EditorAssets.WindowIconsFont);
-                Font iconFont = windowIconsFont?.CreateFont(9);
-
-                _window = mainWindow.RootWindow.Window;
-                _window.HitTest += OnHitTest;
-                _window.Closed += OnWindowClosed;
-
-                ScriptsBuilder.GetBinariesConfiguration(out _, out _, out _, out var configuration);
-
-                _icon = new Image
-                {
-                    Margin = new Margin(6, 6, 6, 6),
-                    Brush = new TextureBrush(windowIcon),
-                    Color = Style.Current.Foreground,
-                    KeepAspectRatio = false,
-                    TooltipText = string.Format("{0}\nVersion {1}\nConfiguration {3}\nGraphics {2}", _window.Title, Globals.EngineVersion, GPUDevice.Instance.RendererType, configuration),
-                    Parent = this,
-                };
-
-                _title = new Label(0, 0, Width, Height)
-                {
-                    Text = _window.Title,
-                    HorizontalAlignment = TextAlignment.Center,
-                    VerticalAlignment = TextAlignment.Center,
-                    ClipText = true,
-                    TextColor = Style.Current.ForegroundGrey,
-                    TextColorHighlighted = Style.Current.ForegroundGrey,
-                    Parent = this,
-                };
-
-                _closeButton = new Button
-                {
-                    Text = ((char)EditorAssets.SegMDL2Icons.ChromeClose).ToString(),
-                    Font = new FontReference(iconFont),
-                    BackgroundColor = Color.Transparent,
-                    BorderColor = Color.Transparent,
-                    BorderColorHighlighted = Color.Transparent,
-                    BorderColorSelected = Color.Transparent,
-                    TextColor = Style.Current.Foreground,
-                    Width = 46,
-                    BackgroundColorHighlighted = Color.Red,
-                    BackgroundColorSelected = Color.Red.RGBMultiplied(1.3f),
-                    Parent = this,
-                };
-                _closeButton.Clicked += () => _window.Close(ClosingReason.User);
-
-                _minimizeButton = new Button
-                {
-                    Text = ((char)EditorAssets.SegMDL2Icons.ChromeMinimize).ToString(),
-                    Font = new FontReference(iconFont),
-                    BackgroundColor = Color.Transparent,
-                    BorderColor = Color.Transparent,
-                    BorderColorHighlighted = Color.Transparent,
-                    BorderColorSelected = Color.Transparent,
-                    TextColor = Style.Current.Foreground,
-                    Width = 46,
-                    BackgroundColorHighlighted = Style.Current.LightBackground.RGBMultiplied(1.3f),
-                    Parent = this,
-                };
-                _minimizeButton.Clicked += () => _window.Minimize();
-
-                _maximizeButton = new Button
-                {
-                    Text = ((char)(_window.IsMaximized ? EditorAssets.SegMDL2Icons.ChromeRestore : EditorAssets.SegMDL2Icons.ChromeMaximize)).ToString(),
-                    Font = new FontReference(iconFont),
-                    BackgroundColor = Color.Transparent,
-                    BorderColor = Color.Transparent,
-                    BorderColorHighlighted = Color.Transparent,
-                    BorderColorSelected = Color.Transparent,
-                    TextColor = Style.Current.Foreground,
-                    Width = 46,
-                    BackgroundColorHighlighted = Style.Current.LightBackground.RGBMultiplied(1.3f),
-                    Parent = this,
-                };
-                _maximizeButton.Clicked += () =>
-                {
-                    if (_window.IsMaximized)
-                        _window.Restore();
-                    else
-                        _window.Maximize();
-                };
-                _charChromeRestore = ((char)EditorAssets.SegMDL2Icons.ChromeRestore).ToString();
-                _charChromeMaximize = ((char)EditorAssets.SegMDL2Icons.ChromeMaximize).ToString();
-            }
-            else
-#endif
-            {
-                BackgroundColor = Style.Current.LightBackground;
-            }
-        }
-
-#if PLATFORM_WINDOWS
-        /// <inheritdoc />
-        public override void Update(float deltaTime)
-        {
-            base.Update(deltaTime);
-
-            if (_maximizeButton != null)
-            {
-                _maximizeButton.Text = _window.IsMaximized ? _charChromeRestore : _charChromeMaximize;
-            }
-        }
-
-        private void OnWindowClosed()
-        {
-            if (_window != null)
-            {
-                _window.HitTest = null;
-                _window = null;
-            }
-        }
-
-        private WindowHitCodes OnHitTest(ref Float2 mouse)
-        {
-            var dpiScale = _window.DpiScale;
-
-            if (_window.IsMinimized)
-                return WindowHitCodes.NoWhere;
-
-            if (!_window.IsMaximized)
-            {
-                var pos = _window.ScreenToClient(mouse * dpiScale); // pos is not DPI adjusted
-                var winSize = _window.Size;
-
-                // Distance from which the mouse is considered to be on the border/corner
-                float distance = 5.0f * dpiScale;
-
-                if (pos.Y > winSize.Y - distance && pos.X < distance)
-                    return WindowHitCodes.BottomLeft;
-
-                if (pos.X > winSize.X - distance && pos.Y > winSize.Y - distance)
-                    return WindowHitCodes.BottomRight;
-
-                if (pos.Y < distance && pos.X < distance)
-                    return WindowHitCodes.TopLeft;
-
-                if (pos.Y < distance && pos.X > winSize.X - distance)
-                    return WindowHitCodes.TopRight;
-
-                if (pos.X > winSize.X - distance)
-                    return WindowHitCodes.Right;
-
-                if (pos.X < distance)
-                    return WindowHitCodes.Left;
-
-                if (pos.Y < distance)
-                    return WindowHitCodes.Top;
-
-                if (pos.Y > winSize.Y - distance)
-                    return WindowHitCodes.Bottom;
-            }
-
-            var mousePos = PointFromScreen(mouse * dpiScale);
-            var controlUnderMouse = GetChildAt(mousePos);
-            var isMouseOverSth = controlUnderMouse != null && controlUnderMouse != _title;
-            var rb = GetRightButton();
-            if (rb != null && _minimizeButton != null && new Rectangle(rb.UpperRight, _minimizeButton.BottomLeft - rb.UpperRight).Contains(ref mousePos) && !isMouseOverSth)
-                return WindowHitCodes.Caption;
-
-            return WindowHitCodes.Client;
-        }
-#endif
-
-        /// <summary>
-        /// Return the rightmost button.
-        /// </summary>
-        /// <returns>Rightmost button, null if there is no <see cref="MainMenuButton"/></returns>
-        private MainMenuButton GetRightButton()
-        {
-            MainMenuButton b = null;
-            foreach (var control in Children)
-            {
-                if (b == null && control is MainMenuButton)
-                    b = (MainMenuButton)control;
-
-                if (control is MainMenuButton && control.Right > b.Right)
-                    b = (MainMenuButton)control;
-            }
-            return b;
+            BackgroundColor = Style.Current.LightBackground;
         }
 
         /// <summary>
@@ -298,26 +100,6 @@ namespace FlaxEditor.GUI
             return result;
         }
 
-        /// <inheritdoc />
-        public override bool OnMouseDoubleClick(Float2 location, MouseButton button)
-        {
-            if (base.OnMouseDoubleClick(location, button))
-                return true;
-
-#if PLATFORM_WINDOWS
-            var child = GetChildAtRecursive(location);
-            if (_useCustomWindowSystem && child is not Button && child is not MainMenuButton)
-            {
-                if (_window.IsMaximized)
-                    _window.Restore();
-                else
-                    _window.Maximize();
-            }
-#endif
-
-            return true;
-        }
-
         /// <inheritdoc />
         public override bool OnKeyDown(KeyboardKeys key)
         {
@@ -333,16 +115,8 @@ namespace FlaxEditor.GUI
         protected override void PerformLayoutAfterChildren()
         {
             float x = 0;
-
-#if PLATFORM_WINDOWS
-            if (_useCustomWindowSystem)
-            {
-                // Icon
-                _icon.X = x;
-                _icon.Size = new Float2(Height);
-                x += _icon.Width;
-            }
-#endif
+            WindowDecorations decorations = Parent.GetChild<WindowDecorations>();
+            x += decorations?.Icon?.Width ?? 0;
 
             // Arrange controls
             MainMenuButton rightMostButton = null;
@@ -361,37 +135,21 @@ namespace FlaxEditor.GUI
                     x += b.Width;
                 }
             }
-
-#if PLATFORM_WINDOWS
-            if (_useCustomWindowSystem)
-            {
-                // Buttons
-                _closeButton.Height = Height;
-                _closeButton.X = Width - _closeButton.Width;
-                _maximizeButton.Height = Height;
-                _maximizeButton.X = _closeButton.X - _maximizeButton.Width;
-                _minimizeButton.Height = Height;
-                _minimizeButton.X = _maximizeButton.X - _minimizeButton.Width;
-
-                // Title
-                _title.Bounds = new Rectangle(x + 2, 0, _minimizeButton.Left - x - 4, Height);
-                //_title.Text = _title.Width < 300.0f ? Editor.Instance.ProjectInfo.Name : _window.Title;
-            }
-#endif
+            
+            // Fill the right side if title and buttons are not present
+            if (decorations?.Title == null)
+                Width = Parent.Width;
+            else
+                Width = x;
         }
 
-#if PLATFORM_WINDOWS
         /// <inheritdoc />
         public override void OnDestroy()
         {
             base.OnDestroy();
-
-            if (_window != null)
-            {
-                _window.Closed -= OnWindowClosed;
-                OnWindowClosed();
-            }
+            
+            if (_selected != null)
+                Selected = null;
         }
-#endif
     }
 }

Source/Editor/GUI/MainMenuButton.cs

@@ -42,14 +42,12 @@ namespace FlaxEditor.GUI
             Text = text;
 
             var style = Style.Current;
-#if PLATFORM_WINDOWS
-            if (Editor.Instance.Options.Options.Interface.UseNativeWindowSystem)
+            if (!Utilities.Utils.UseCustomWindowDecorations())
             {
                 BackgroundColorMouseOver = style.BackgroundHighlighted;
                 BackgroundColorMouseOverOpened = style.Background;
             }
             else
-#endif
             {
                 BackgroundColorMouseOver = BackgroundColorMouseOverOpened = style.LightBackground * 1.3f;
             }

Source/Editor/GUI/Timeline/EditCurveTrackGizmo.cs

@@ -144,7 +144,7 @@ namespace FlaxEditor.GUI.Timeline
                 var k = keyframes[i];
 
                 var sphere = new BoundingSphere(k.Value, KeyframeSize);
-                if (sphere.Intersects(ref selectRay))
+                if (sphere.Intersects(selectRay))
                 {
                     SelectKeyframe(_track, i, 0);
                     return;
@@ -154,7 +154,7 @@ namespace FlaxEditor.GUI.Timeline
                 {
                     var t = k.Value + k.TangentIn;
                     var box = BoundingBox.FromSphere(new BoundingSphere(t, TangentSize));
-                    if (box.Intersects(ref selectRay))
+                    if (box.Intersects(selectRay))
                     {
                         SelectKeyframe(_track, i, 1);
                         return;
@@ -165,7 +165,7 @@ namespace FlaxEditor.GUI.Timeline
                 {
                     var t = k.Value + k.TangentOut;
                     var box = BoundingBox.FromSphere(new BoundingSphere(t, TangentSize));
-                    if (box.Intersects(ref selectRay))
+                    if (box.Intersects(selectRay))
                     {
                         SelectKeyframe(_track, i, 2);
                         return;

Source/Editor/GUI/Timeline/GUI/GradientEditor.cs

@@ -115,7 +115,7 @@ namespace FlaxEditor.GUI.Timeline.GUI
             /// <inheritdoc />
             public override void OnMouseMove(Float2 location)
             {
-                if (_isMoving && Float2.DistanceSquared(ref location, ref _startMovePos) > 25.0f)
+                if (_isMoving && Float2.DistanceSquared(location, _startMovePos) > 25.0f)
                 {
                     _startMovePos = Float2.Minimum;
                     var x = PointToParent(location).X;
@@ -387,7 +387,7 @@ namespace FlaxEditor.GUI.Timeline.GUI
         {
             // Push clipping mask
             GetDesireClientArea(out var clientArea);
-            Render2D.PushClip(ref clientArea);
+            Render2D.PushClip(clientArea);
 
             var style = Style.Current;
             var bounds = new Rectangle(Float2.Zero, Size);

Source/Editor/GUI/Timeline/GUI/KeyframesEditor.cs

@@ -115,7 +115,7 @@ namespace FlaxEditor.GUI
                 {
                     if (Children[i] is KeyframePoint p)
                     {
-                        p.IsSelected = p.Bounds.Intersects(ref selectionRect);
+                        p.IsSelected = p.Bounds.Intersects(selectionRect);
                     }
                 }
             }
@@ -401,7 +401,7 @@ namespace FlaxEditor.GUI
                     Cursor = CursorType.Default;
 
                     // Check if no move has been made at all
-                    if (Float2.Distance(ref location, ref _rightMouseDownPos) < 2.0f)
+                    if (Float2.Distance(location, _rightMouseDownPos) < 2.0f)
                     {
                         var selectionCount = _editor.SelectionCount;
                         var point = GetChildAt(location) as KeyframePoint;

Source/Editor/GUI/Timeline/GUI/PositionHandle.cs

@@ -50,14 +50,14 @@ namespace FlaxEditor.GUI.Timeline.GUI
             var color = (_timeline.IsMovingPositionHandle ? style.SelectionBorder : style.Foreground).AlphaMultiplied(0.6f);
             Matrix3x3.RotationZ(Mathf.PiOverTwo, out var m1);
             var m2 = Matrix3x3.Translation2D(0, timeAxisHeaderOffset);
-            Matrix3x3.Multiply(ref m1, ref m2, out var m3);
-            Render2D.PushTransform(ref m3);
+            Matrix3x3.Multiply(m1, m2, out var m3);
+            Render2D.PushTransform(m3);
             // TODO: Convert to its own sprite or 9 slice
             Render2D.DrawSprite(icon, new Rectangle(new Float2(10, -icon.Size.X * 0.5f - 1), Size + new Float2(0, 1)), color);
             Render2D.FillRectangle(new Rectangle(new Float2(-6, -icon.Size.Y * 0.5f + 7), new Float2(timeAxisOverlap, 5)), color);
             Render2D.PopTransform();
             var textMatrix = Matrix3x3.Translation2D(12, timeAxisHeaderOffset);
-            Render2D.PushTransform(ref textMatrix);
+            Render2D.PushTransform(textMatrix);
             Render2D.DrawText(style.FontSmall, labelText, style.Foreground, new Float2(2, -6));
             Render2D.PopTransform();
 

Source/Editor/GUI/Timeline/Media.cs

@@ -356,7 +356,7 @@ namespace FlaxEditor.GUI.Timeline
             {
                 Render2D.DrawLine(bounds.UpperLeft, bounds.BottomLeft, moveColor, moveThickness);
             }
-            else if (IsMouseOver && CanResize && MoveLeftEdgeRect.Contains(ref _mouseLocation))
+            else if (IsMouseOver && CanResize && MoveLeftEdgeRect.Contains(_mouseLocation))
             {
                 Render2D.DrawLine(bounds.UpperLeft, bounds.BottomLeft, Color.Yellow);
             }
@@ -364,7 +364,7 @@ namespace FlaxEditor.GUI.Timeline
             {
                 Render2D.DrawLine(bounds.UpperRight, bounds.BottomRight, moveColor, moveThickness);
             }
-            else if (IsMouseOver && CanResize && MoveRightEdgeRect.Contains(ref _mouseLocation))
+            else if (IsMouseOver && CanResize && MoveRightEdgeRect.Contains(_mouseLocation))
             {
                 Render2D.DrawLine(bounds.UpperRight, bounds.BottomRight, Color.Yellow);
             }
@@ -384,8 +384,8 @@ namespace FlaxEditor.GUI.Timeline
                 _startMoveLocation = Root.MousePosition;
                 _startMoveStartFrame = StartFrame;
                 _startMoveDuration = DurationFrames;
-                _startMoveLeftEdge = MoveLeftEdgeRect.Contains(ref location) && CanResize;
-                _startMoveRightEdge = MoveRightEdgeRect.Contains(ref location) && CanResize;
+                _startMoveLeftEdge = MoveLeftEdgeRect.Contains(location) && CanResize;
+                _startMoveRightEdge = MoveRightEdgeRect.Contains(location) && CanResize;
                 StartMouseCapture(true);
                 if (_startMoveLeftEdge || _startMoveRightEdge)
                     return true;

Source/Editor/GUI/Timeline/SceneAnimationTimeline.cs

@@ -337,7 +337,7 @@ namespace FlaxEditor.GUI.Timeline
                             DebugDraw.DrawSphere(sphere, selected ? Color.Yellow : Color.Red);
                             sphere.Radius *= 0.95f;
                             DebugDraw.DrawSphere(sphere, new Color(1, 0, 0, coveredAlpha), 0, false);
-                            if (select && sphere.Intersects(ref selectRay))
+                            if (select && sphere.Intersects(selectRay))
                                 SelectKeyframeGizmo(curveTrack, i, 0);
 
                             if (!k.TangentIn.IsZero)
@@ -349,7 +349,7 @@ namespace FlaxEditor.GUI.Timeline
                                 var box = BoundingBox.FromSphere(new BoundingSphere(t, EditCurveTrackGizmo.TangentSize));
                                 DebugDraw.DrawBox(box, selected ? Color.Yellow : Color.AliceBlue);
                                 DebugDraw.DrawBox(box, Color.AliceBlue.AlphaMultiplied(coveredAlpha), 0, false);
-                                if (select && box.Intersects(ref selectRay))
+                                if (select && box.Intersects(selectRay))
                                     SelectKeyframeGizmo(curveTrack, i, 2);
                             }
 
@@ -362,7 +362,7 @@ namespace FlaxEditor.GUI.Timeline
                                 var box = BoundingBox.FromSphere(new BoundingSphere(t, EditCurveTrackGizmo.TangentSize));
                                 DebugDraw.DrawBox(box, selected ? Color.Yellow : Color.AliceBlue);
                                 DebugDraw.DrawBox(box, Color.AliceBlue.AlphaMultiplied(coveredAlpha), 0, false);
-                                if (select && box.Intersects(ref selectRay))
+                                if (select && box.Intersects(selectRay))
                                     SelectKeyframeGizmo(curveTrack, i, 2);
                             }
 

Source/Editor/GUI/Timeline/Timeline.cs

@@ -2078,7 +2078,7 @@ namespace FlaxEditor.GUI.Timeline
             if (button == MouseButton.Right && _isRightMouseButtonDown)
             {
                 _isRightMouseButtonDown = false;
-                if (Float2.Distance(ref location, ref _rightMouseButtonDownPos) < 4.0f)
+                if (Float2.Distance(location, _rightMouseButtonDownPos) < 4.0f)
                     ShowContextMenu(location);
             }
 
@@ -2243,7 +2243,7 @@ namespace FlaxEditor.GUI.Timeline
 
                 foreach (var media in _tracks[i].Media)
                 {
-                    if (media.Bounds.Intersects(ref mediaRect))
+                    if (media.Bounds.Intersects(mediaRect))
                     {
                         SelectedMedia.Add(media);
                         selectionChanged = true;

Source/Editor/GUI/Timeline/Track.cs

@@ -810,7 +810,7 @@ namespace FlaxEditor.GUI.Timeline
         /// <returns>True if hits it.</returns>
         protected virtual bool TestHeaderHit(ref Float2 location)
         {
-            return new Rectangle(0, 0, Width, HeaderHeight).Contains(ref location);
+            return new Rectangle(0, 0, Width, HeaderHeight).Contains(location);
         }
 
         /// <summary>

Source/Editor/GUI/Timeline/Tracks/AnimationEventTrack.cs

@@ -208,7 +208,7 @@ namespace FlaxEditor.GUI.Timeline.Tracks
                 // Hit-test dot
                 var size = Height - 2.0f;
                 var rect = new Rectangle(new Float2(size * -0.5f) + Size * 0.5f, new Float2(size));
-                return rect.Contains(ref location);
+                return rect.Contains(location);
             }
 
             return base.ContainsPoint(ref location, precise);

Source/Editor/GUI/Timeline/Tracks/CameraCutTrack.cs

@@ -527,7 +527,7 @@ namespace FlaxEditor.GUI.Timeline.Tracks
             {
                 _output = GPUDevice.Instance.CreateTexture("CameraCutMedia.Output");
                 var desc = GPUTextureDescription.New2D(Width, Height, PixelFormat.R8G8B8A8_UNorm);
-                _output.Init(ref desc);
+                _output.Init(desc);
             }
             if (_task == null)
             {

Source/Editor/GUI/Tree/Tree.cs

@@ -258,7 +258,7 @@ namespace FlaxEditor.GUI.Tree
                     }
 
                     var nodeArea = new Rectangle(pos, child.Size);
-                    if (child.IsExpanded && range.Intersects(ref nodeArea))
+                    if (child.IsExpanded && range.Intersects(nodeArea))
                         WalkSelectRangeExpandedTree(selection, child, ref range);
                 }
             }

Source/Editor/GUI/Tree/TreeNode.cs

@@ -555,7 +555,7 @@ namespace FlaxEditor.GUI.Tree
         /// <returns>True if hits it.</returns>
         protected virtual bool TestHeaderHit(ref Float2 location)
         {
-            return _headerRect.Contains(ref location);
+            return _headerRect.Contains(location);
         }
 
         /// <summary>
@@ -864,14 +864,14 @@ namespace FlaxEditor.GUI.Tree
                     var child = children[i];
                     if (!child.Visible)
                         continue;
-                    Render2D.PushTransform(ref child._cachedTransform);
+                    Render2D.PushTransform(child._cachedTransform);
                     child.Draw();
                     Render2D.PopTransform();
                 }
 
                 static Rectangle GetChildGlobalRectangle(Control control, ref Matrix3x3 globalTransform)
                 {
-                    Matrix3x3.Multiply(ref control._cachedTransform, ref globalTransform, out var globalChildTransform);
+                    Matrix3x3.Multiply(control._cachedTransform, globalTransform, out var globalChildTransform);
                     return new Rectangle(globalChildTransform.M31, globalChildTransform.M32, control.Width * globalChildTransform.M11, control.Height * globalChildTransform.M22);
                 }
             }
@@ -882,7 +882,7 @@ namespace FlaxEditor.GUI.Tree
                     var child = children[i];
                     if (child.Visible)
                     {
-                        Render2D.PushTransform(ref child._cachedTransform);
+                        Render2D.PushTransform(child._cachedTransform);
                         child.Draw();
                         Render2D.PopTransform();
                     }

Source/Editor/GUI/Tree/TreeNodeWithAddons.cs

@@ -24,7 +24,7 @@ namespace FlaxEditor.GUI.Tree
 
             foreach (var child in Addons)
             {
-                Render2D.PushTransform(ref child._cachedTransform);
+                Render2D.PushTransform(child._cachedTransform);
                 child.Draw();
                 Render2D.PopTransform();
             }

Source/Editor/GUI/WindowDecorations.cs

@@ -0,0 +1,342 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+using System;
+using FlaxEditor.GUI.Docking;
+using FlaxEditor.Options;
+using FlaxEngine;
+using FlaxEngine.GUI;
+
+namespace FlaxEditor.GUI;
+
+/// <summary>
+/// Represents the title bar of the window with buttons.
+/// </summary>
+/// <seealso cref="FlaxEngine.GUI.ContainerControl" />
+public class WindowDecorations : ContainerControl
+{
+    private Image _icon;
+    private Label _title;
+    private Button _closeButton;
+    private Button _minimizeButton;
+    private Button _maximizeButton;
+    private LocalizedString _charChromeRestore, _charChromeMaximize;
+    private Window _window;
+
+    /// <summary>
+    /// The title label in the title bar.
+    /// </summary>
+    public Label Title => _title;
+    
+    /// <summary>
+    /// The icon used in the title bar.
+    /// </summary>
+    public Image Icon => _icon;
+    
+    /// <summary>
+    /// The tooltip shown when hovering over the icon.
+    /// </summary>
+    public string IconTooltipText
+    {
+        get => _icon?.TooltipText ?? null;
+        set
+        {
+            if (_icon != null)
+                _icon.TooltipText = value;
+        }
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="WindowDecorations"/> class.
+    /// </summary>
+    /// <param name="window">The window.</param>
+    /// <param name="iconOnly">When set, omit drawing title and buttons.</param>
+    public WindowDecorations(RootControl window, bool iconOnly = false)
+    : base(0, 0, 0, 20)
+    {
+        _window = window.RootWindow.Window;
+        
+        AutoFocus = false;
+        AnchorPreset = AnchorPresets.HorizontalStretchTop;
+        BackgroundColor = Color.Transparent;
+
+        var windowIcon = FlaxEngine.Content.LoadAsyncInternal<Texture>(EditorAssets.WindowIcon);
+
+        _icon = new Image
+        {
+            Margin = new Margin(4, 4, 4, 4),
+            Brush = new TextureBrush(windowIcon),
+            Color = Style.Current.Foreground,
+            BackgroundColor = Style.Current.LightBackground,
+            KeepAspectRatio = false,
+            Parent = this,
+        };
+
+        if (!iconOnly)
+        {
+            _icon.Margin = new Margin(6, 6, 6, 6);
+            Height = 28;
+            
+            _window.HitTest += OnHitTest;
+            _window.Closed += OnWindowClosed;
+            
+            FontAsset windowIconsFont = FlaxEngine.Content.LoadAsyncInternal<FontAsset>(EditorAssets.WindowIconsFont);
+            Font iconFont = windowIconsFont?.CreateFont(9);
+            
+            _title = new Label(0, 0, Width, Height)
+            {
+                Text = _window.Title,
+                HorizontalAlignment = TextAlignment.Center,
+                VerticalAlignment = TextAlignment.Center,
+                ClipText = true,
+                TextColor = Style.Current.ForegroundGrey,
+                TextColorHighlighted = Style.Current.ForegroundGrey,
+                BackgroundColor = Style.Current.LightBackground,
+                Parent = this,
+            };
+
+            _closeButton = new Button
+            {
+                Text = ((char)EditorAssets.SegMDL2Icons.ChromeClose).ToString(),
+                Font = new FontReference(iconFont),
+                BackgroundColor = Style.Current.LightBackground,
+                BorderColor = Color.Transparent,
+                BorderColorHighlighted = Color.Transparent,
+                BorderColorSelected = Color.Transparent,
+                TextColor = Style.Current.Foreground,
+                Width = 46,
+                BackgroundColorHighlighted = Color.Red,
+                BackgroundColorSelected = Color.Red.RGBMultiplied(1.3f),
+                Parent = this,
+            };
+            _closeButton.Clicked += () => _window.Close(ClosingReason.User);
+
+            _minimizeButton = new Button
+            {
+                Text = ((char)EditorAssets.SegMDL2Icons.ChromeMinimize).ToString(),
+                Font = new FontReference(iconFont),
+                BackgroundColor = Style.Current.LightBackground,
+                BorderColor = Color.Transparent,
+                BorderColorHighlighted = Color.Transparent,
+                BorderColorSelected = Color.Transparent,
+                TextColor = Style.Current.Foreground,
+                Width = 46,
+                BackgroundColorHighlighted = Style.Current.LightBackground.RGBMultiplied(1.3f),
+                Parent = this,
+            };
+            _minimizeButton.Clicked += () => _window.Minimize();
+
+            _maximizeButton = new Button
+            {
+                Text = ((char)(_window.IsMaximized ? EditorAssets.SegMDL2Icons.ChromeRestore : EditorAssets.SegMDL2Icons.ChromeMaximize)).ToString(),
+                Font = new FontReference(iconFont),
+                BackgroundColor = Style.Current.LightBackground,
+                BorderColor = Color.Transparent,
+                BorderColorHighlighted = Color.Transparent,
+                BorderColorSelected = Color.Transparent,
+                TextColor = Style.Current.Foreground,
+                Width = 46,
+                BackgroundColorHighlighted = Style.Current.LightBackground.RGBMultiplied(1.3f),
+                Parent = this,
+            };
+            _maximizeButton.Clicked += () =>
+            {
+                if (_window.IsMaximized)
+                    _window.Restore();
+                else
+                    _window.Maximize();
+            };
+
+            _charChromeRestore = ((char)EditorAssets.SegMDL2Icons.ChromeRestore).ToString();
+            _charChromeMaximize = ((char)EditorAssets.SegMDL2Icons.ChromeMaximize).ToString();
+        }
+    }
+    
+    /// <inheritdoc />
+    public override void Update(float deltaTime)
+    {
+        base.Update(deltaTime);
+
+        if (_maximizeButton != null)
+        {
+            var maximizeText = _window.IsMaximized ? _charChromeRestore : _charChromeMaximize;
+            if (_maximizeButton.Text != maximizeText)
+                _maximizeButton.Text = maximizeText;
+        }
+    }
+
+    private void OnWindowClosed()
+    {
+        if (_window != null)
+        {
+            _window.HitTest -= OnHitTest;
+            _window = null;
+        }
+    }
+
+    /// <summary>
+    /// Perform hit test on the window.
+    /// </summary>
+    /// <param name="mouse">The mouse position</param>
+    /// <returns>The hit code for given position.</returns>
+    protected virtual WindowHitCodes OnHitTest(ref Float2 mouse)
+    {
+        if (_window.IsMinimized)
+            return WindowHitCodes.NoWhere;
+
+        var dpiScale = _window.DpiScale;
+        var pos = _window.ScreenToClient(mouse * dpiScale); // pos is not DPI adjusted
+        if (!_window.IsMaximized)
+        {
+            var winSize = _window.Size;
+
+            // Distance from which the mouse is considered to be on the border/corner
+            float distance = 5.0f * dpiScale;
+
+            if (pos.Y > winSize.Y - distance && pos.X < distance)
+                return WindowHitCodes.BottomLeft;
+
+            if (pos.X > winSize.X - distance && pos.Y > winSize.Y - distance)
+                return WindowHitCodes.BottomRight;
+
+            if (pos.Y < distance && pos.X < distance)
+                return WindowHitCodes.TopLeft;
+
+            if (pos.Y < distance && pos.X > winSize.X - distance)
+                return WindowHitCodes.TopRight;
+
+            if (pos.X > winSize.X - distance)
+                return WindowHitCodes.Right;
+
+            if (pos.X < distance)
+                return WindowHitCodes.Left;
+
+            if (pos.Y < distance)
+                return WindowHitCodes.Top;
+
+            if (pos.Y > winSize.Y - distance)
+                return WindowHitCodes.Bottom;
+        }
+        
+        var controlUnderMouse = GetChildAt(pos, control => control != _title);
+        if (_title.Bounds.Contains(pos) && controlUnderMouse == null)
+            return WindowHitCodes.Caption;
+
+        return WindowHitCodes.Client;
+    }
+    
+    /// <inheritdoc />
+    public override bool OnMouseDoubleClick(Float2 location, MouseButton button)
+    {
+        // These may not work with main window due to SDL not passing mouse events
+        // when interacting with hit tests on caption area...
+        
+        if (Title.Bounds.Contains(location) && button == MouseButton.Left)
+        {
+            if (_window.IsMaximized)
+                _window.Restore();
+            else
+                _window.Maximize();
+            return true;
+        }
+        else if (Icon.Bounds.Contains(location) && button == MouseButton.Left)
+        {
+            _window.Close(ClosingReason.User);
+            return true;
+        }
+        return base.OnMouseDoubleClick(location, button);
+    }
+
+    /// <inheritdoc />
+    protected override void PerformLayoutAfterChildren()
+    {
+        // Calculate extents for title bounds area excluding the icon and main menu area
+        float x = 0;
+        
+        // Icon
+        if (_icon != null)
+        {
+            _icon.X = x;
+            _icon.Size = new Float2(Height);
+            x += _icon.Width;
+        }
+
+        // Main menu if present
+        if (Parent.GetChild<MainMenu>() is MainMenu mainMenu)
+        {
+            for (int i = 0; i < mainMenu.Children.Count; i++)
+            {
+                var c = mainMenu.Children[i];
+                if (c is MainMenuButton b && c.Visible)
+                {
+                    b.Bounds = new Rectangle(x, 0, b.Width, Height);
+                    x += b.Width;
+                }
+            }
+        }
+     
+        // Buttons
+        float rightMostButtonX = Width;
+        if (_closeButton != null)
+        {
+            _closeButton.Height = Height;
+            _closeButton.X = rightMostButtonX - _closeButton.Width;
+            rightMostButtonX = _closeButton.X;
+        }
+        if (_maximizeButton != null)
+        {
+            _maximizeButton.Height = Height;
+            _maximizeButton.X = rightMostButtonX - _maximizeButton.Width;
+            rightMostButtonX = _maximizeButton.X;
+        }
+        if (_minimizeButton != null)
+        {
+            _minimizeButton.Height = Height;
+            _minimizeButton.X = rightMostButtonX - _minimizeButton.Width;
+            rightMostButtonX = _minimizeButton.X;
+        }
+
+        // Title
+        if (_title != null)
+        {
+            _title.Text = _window.Title;
+            _title.Bounds = new Rectangle(x, 0, rightMostButtonX - x, Height);
+        }
+    }
+    
+    /// <inheritdoc />
+    public override void Draw()
+    {
+        base.Draw();
+        DrawBorders();
+    }
+
+    /// <summary>
+    /// Draw borders around the window.
+    /// </summary>
+    public virtual void DrawBorders()
+    {
+        var win = RootWindow.Window;
+        if (win.IsMaximized)
+            return;
+
+        if (Editor.Instance.UI.StatusBar == null)
+            return;
+        
+        const float thickness = 1.0f;
+        Color color = Editor.Instance.UI.StatusBar.StatusColor;
+        Rectangle rect = new Rectangle(thickness * 0.5f, thickness * 0.5f, Parent.Width - thickness, Parent.Height - thickness);
+        Render2D.DrawRectangle(rect, color);
+    }
+
+    /// <inheritdoc />
+    public override void OnDestroy()
+    {
+        base.OnDestroy();
+
+        if (_window != null)
+        {
+            _window.Closed -= OnWindowClosed;
+            OnWindowClosed();
+        }
+    }
+}

Source/Editor/Gizmo/EditorPrimitives.cs

@@ -56,9 +56,9 @@ namespace FlaxEditor.Gizmo
             var width = output.Width;
             var height = output.Height;
             var desc = GPUTextureDescription.New2D(width, height, format, GPUTextureFlags.RenderTarget | GPUTextureFlags.ShaderResource, 1, 1, msaaLevel);
-            var target = RenderTargetPool.Get(ref desc);
+            var target = RenderTargetPool.Get(desc);
             desc = GPUTextureDescription.New2D(width, height, PixelFormat.D24_UNorm_S8_UInt, GPUTextureFlags.DepthStencil, 1, 1, msaaLevel);
-            var targetDepth = RenderTargetPool.Get(ref desc);
+            var targetDepth = RenderTargetPool.Get(desc);
 
             // Copy frame and clear depth
             context.Draw(target, input);
@@ -81,16 +81,16 @@ namespace FlaxEditor.Gizmo
             }
 
             // Sort draw calls
-            renderList.SortDrawCalls(ref renderContext, false, DrawCallsListType.GBuffer);
-            renderList.SortDrawCalls(ref renderContext, false, DrawCallsListType.GBufferNoDecals);
-            renderList.SortDrawCalls(ref renderContext, true, DrawCallsListType.Forward);
+            renderList.SortDrawCalls(renderContext, false, DrawCallsListType.GBuffer);
+            renderList.SortDrawCalls(renderContext, false, DrawCallsListType.GBufferNoDecals);
+            renderList.SortDrawCalls(renderContext, true, DrawCallsListType.Forward);
 
             // Perform the rendering
             renderContext.View.Pass = DrawPass.GBuffer;
-            renderList.ExecuteDrawCalls(ref renderContext, DrawCallsListType.GBuffer);
-            renderList.ExecuteDrawCalls(ref renderContext, DrawCallsListType.GBufferNoDecals);
+            renderList.ExecuteDrawCalls(renderContext, DrawCallsListType.GBuffer);
+            renderList.ExecuteDrawCalls(renderContext, DrawCallsListType.GBufferNoDecals);
             renderContext.View.Pass = DrawPass.Forward;
-            renderList.ExecuteDrawCalls(ref renderContext, DrawCallsListType.Forward);
+            renderList.ExecuteDrawCalls(renderContext, DrawCallsListType.Forward);
 
             // Resolve MSAA texture
             if (enableMsaa)

Source/Editor/Gizmo/GridGizmo.cs

@@ -70,7 +70,7 @@ namespace FlaxEditor.Gizmo
                     _vertexBuffer = new GPUBuffer();
                     var layout = GPUVertexLayout.Get([new VertexElement(VertexElement.Types.Position, 0, 0, false, PixelFormat.R32G32B32_Float)]);
                     var desc = GPUBufferDescription.Vertex(layout, sizeof(Float3), 4);
-                    _vertexBuffer.Init(ref desc);
+                    _vertexBuffer.Init(desc);
                 }
                 if (_indexBuffer == null)
                 {
@@ -78,7 +78,7 @@ namespace FlaxEditor.Gizmo
                     fixed (uint* ptr = _triangles)
                     {
                         var desc = GPUBufferDescription.Index(sizeof(uint), _triangles.Length, new IntPtr(ptr));
-                        _indexBuffer.Init(ref desc);
+                        _indexBuffer.Init(desc);
                     }
                 }
                 if (_psGrid == null)
@@ -90,7 +90,7 @@ namespace FlaxEditor.Gizmo
                     desc.VS = _shader.GPU.GetVS("VS_Grid");
                     desc.PS = _shader.GPU.GetPS("PS_Grid");
                     desc.DepthWriteEnable = false;
-                    _psGrid.Init(ref desc);
+                    _psGrid.Init(desc);
                 }
 
                 // Update vertices of the plane
@@ -113,8 +113,8 @@ namespace FlaxEditor.Gizmo
                 if (cb != IntPtr.Zero)
                 {
                     var data = new Data();
-                    Matrix.Multiply(ref renderContext.View.View, ref renderContext.View.Projection, out var viewProjection);
-                    Matrix.Transpose(ref viewProjection, out data.ViewProjectionMatrix);
+                    Matrix.Multiply(renderContext.View.View, renderContext.View.Projection, out var viewProjection);
+                    Matrix.Transpose(viewProjection, out data.ViewProjectionMatrix);
                     data.ViewPos = renderContext.View.WorldPosition;
                     data.GridColor = options.Viewport.ViewportGridColor;
                     data.Far = renderContext.View.Far;

Source/Editor/Gizmo/SelectionOutline.cs

@@ -128,7 +128,7 @@ namespace FlaxEditor.Gizmo
 
             // Pick a temporary depth buffer
             var desc = GPUTextureDescription.New2D(input.Width, input.Height, PixelFormat.D32_Float, GPUTextureFlags.DepthStencil | GPUTextureFlags.ShaderResource);
-            var customDepth = RenderTargetPool.Get(ref desc);
+            var customDepth = RenderTargetPool.Get(desc);
             context.ClearDepth(customDepth.View());
 
             // Draw objects to depth buffer
@@ -148,7 +148,7 @@ namespace FlaxEditor.Gizmo
             _material.SetParameterValue("OutlineColor1", _color1);
             _material.SetParameterValue("CustomDepth", customDepth);
             _material.SetParameterValue("ViewInfo", new Float4(1.0f / projection.M11, 1.0f / projection.M22, far / (far - near), (-far * near) / (far - near) / far));
-            Renderer.DrawPostFxMaterial(context, ref renderContext, _material, output, input.View());
+            Renderer.DrawPostFxMaterial(context, renderContext, _material, output, input.View());
 
             // Cleanup
             RenderTargetPool.Release(customDepth);

Source/Editor/Gizmo/TransformGizmo.cs

@@ -129,7 +129,7 @@ namespace FlaxEditor.Gizmo
                         if (_selectionParents[i] is ActorNode actorNode)
                         {
                             var b = actorNode.Actor.EditorBoxChildren;
-                            BoundingBox.Merge(ref editorBounds, ref b, out editorBounds);
+                            BoundingBox.Merge(editorBounds, b, out editorBounds);
                             bottomToCenter = Mathf.Min(bottomToCenter, actorNode.Actor.Position.Y - editorBounds.Minimum.Y);
                         }
                     }

Source/Editor/Gizmo/TransformGizmoBase.Draw.cs

@@ -135,7 +135,7 @@ namespace FlaxEditor.Gizmo
             Mesh sphereMesh = _modelSphere.LODs[0].Meshes[0];
 
             Matrix.Scaling(gizmoModelsScale2RealGizmoSize, out m3);
-            Matrix.Multiply(ref m3, ref world, out m1);
+            Matrix.Multiply(m3, world, out m1);
             mx1 = m1;
             mx1.M41 += 0.05f;
 
@@ -149,44 +149,44 @@ namespace FlaxEditor.Gizmo
 
                 // X axis
                 Matrix.RotationY(-Mathf.PiOverTwo, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance xAxisMaterialTransform = (isXAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisX;
-                transAxisMesh.Draw(ref renderContext, xAxisMaterialTransform, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                transAxisMesh.Draw(renderContext, xAxisMaterialTransform, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Y axis
                 Matrix.RotationX(Mathf.PiOverTwo, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance yAxisMaterialTransform = (isYAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisY;
-                transAxisMesh.Draw(ref renderContext, yAxisMaterialTransform, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                transAxisMesh.Draw(renderContext, yAxisMaterialTransform, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Z axis
                 Matrix.RotationX(Mathf.Pi, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance zAxisMaterialTransform = (isZAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisZ;
-                transAxisMesh.Draw(ref renderContext, zAxisMaterialTransform, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                transAxisMesh.Draw(renderContext, zAxisMaterialTransform, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // XY plane
                 m2 = Matrix.Transformation(new Vector3(boxSize, boxSize * 0.1f, boxSize), Quaternion.RotationX(Mathf.PiOverTwo), new Vector3(boxSize * boxScale, boxSize * boxScale, 0.0f));
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance xyPlaneMaterialTransform = (_activeAxis == Axis.XY && !_isDisabled) ? _materialAxisFocus : _materialAxisX;
-                cubeMesh.Draw(ref renderContext, xyPlaneMaterialTransform, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                cubeMesh.Draw(renderContext, xyPlaneMaterialTransform, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // ZX plane
                 m2 = Matrix.Transformation(new Vector3(boxSize, boxSize * 0.1f, boxSize), Quaternion.Identity, new Vector3(boxSize * boxScale, 0.0f, boxSize * boxScale));
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance zxPlaneMaterialTransform = (_activeAxis == Axis.ZX && !_isDisabled) ? _materialAxisFocus : _materialAxisY;
-                cubeMesh.Draw(ref renderContext, zxPlaneMaterialTransform, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                cubeMesh.Draw(renderContext, zxPlaneMaterialTransform, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // YZ plane
                 m2 = Matrix.Transformation(new Vector3(boxSize, boxSize * 0.1f, boxSize), Quaternion.RotationZ(Mathf.PiOverTwo), new Vector3(0.0f, boxSize * boxScale, boxSize * boxScale));
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance yzPlaneMaterialTransform = (_activeAxis == Axis.YZ && !_isDisabled) ? _materialAxisFocus : _materialAxisZ;
-                cubeMesh.Draw(ref renderContext, yzPlaneMaterialTransform, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                cubeMesh.Draw(renderContext, yzPlaneMaterialTransform, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Center sphere
                 Matrix.Scaling(gizmoModelsScale2RealGizmoSize, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
-                sphereMesh.Draw(ref renderContext, isCenter ? _materialAxisFocus : _materialSphere, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                Matrix.Multiply(m2, m1, out m3);
+                sphereMesh.Draw(renderContext, isCenter ? _materialAxisFocus : _materialSphere, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 break;
             }
@@ -199,24 +199,24 @@ namespace FlaxEditor.Gizmo
 
                 // X axis
                 Matrix.RotationZ(Mathf.PiOverTwo, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance xAxisMaterialRotate = (isXAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisX;
-                rotationAxisMesh.Draw(ref renderContext, xAxisMaterialRotate, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                rotationAxisMesh.Draw(renderContext, xAxisMaterialRotate, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Y axis
                 MaterialInstance yAxisMaterialRotate = (isYAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisY;
-                rotationAxisMesh.Draw(ref renderContext, yAxisMaterialRotate, ref m1, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                rotationAxisMesh.Draw(renderContext, yAxisMaterialRotate, m1, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Z axis
                 Matrix.RotationX(-Mathf.PiOverTwo, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance zAxisMaterialRotate = (isZAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisZ;
-                rotationAxisMesh.Draw(ref renderContext, zAxisMaterialRotate, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                rotationAxisMesh.Draw(renderContext, zAxisMaterialRotate, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Center box
                 Matrix.Scaling(gizmoModelsScale2RealGizmoSize, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
-                sphereMesh.Draw(ref renderContext, isCenter ? _materialAxisFocus : _materialSphere, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                Matrix.Multiply(m2, m1, out m3);
+                sphereMesh.Draw(renderContext, isCenter ? _materialAxisFocus : _materialSphere, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 break;
             }
@@ -229,44 +229,44 @@ namespace FlaxEditor.Gizmo
 
                 // X axis
                 Matrix.RotationY(-Mathf.PiOverTwo, out m2);
-                Matrix.Multiply(ref m2, ref mx1, out m3);
+                Matrix.Multiply(m2, mx1, out m3);
                 MaterialInstance xAxisMaterialRotate = (isXAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisX;
-                scaleAxisMesh.Draw(ref renderContext, xAxisMaterialRotate, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                scaleAxisMesh.Draw(renderContext, xAxisMaterialRotate, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Y axis
                 Matrix.RotationX(Mathf.PiOverTwo, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance yAxisMaterialRotate = (isYAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisY;
-                scaleAxisMesh.Draw(ref renderContext, yAxisMaterialRotate, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                scaleAxisMesh.Draw(renderContext, yAxisMaterialRotate, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Z axis
                 Matrix.RotationX(Mathf.Pi, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance zAxisMaterialRotate = (isZAxis && !_isDisabled) ? _materialAxisFocus : _materialAxisZ;
-                scaleAxisMesh.Draw(ref renderContext, zAxisMaterialRotate, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                scaleAxisMesh.Draw(renderContext, zAxisMaterialRotate, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // XY plane
                 m2 = Matrix.Transformation(new Vector3(boxSize, boxSize * 0.1f, boxSize), Quaternion.RotationX(Mathf.PiOverTwo), new Vector3(boxSize * boxScale, boxSize * boxScale, 0.0f));
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance xyPlaneMaterialScale = (_activeAxis == Axis.XY && !_isDisabled) ? _materialAxisFocus : _materialAxisX;
-                cubeMesh.Draw(ref renderContext, xyPlaneMaterialScale, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                cubeMesh.Draw(renderContext, xyPlaneMaterialScale, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // ZX plane
                 m2 = Matrix.Transformation(new Vector3(boxSize, boxSize * 0.1f, boxSize), Quaternion.Identity, new Vector3(boxSize * boxScale, 0.0f, boxSize * boxScale));
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance zxPlaneMaterialScale = (_activeAxis == Axis.ZX && !_isDisabled) ? _materialAxisFocus : _materialAxisZ;
-                cubeMesh.Draw(ref renderContext, zxPlaneMaterialScale, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                cubeMesh.Draw(renderContext, zxPlaneMaterialScale, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // YZ plane
                 m2 = Matrix.Transformation(new Vector3(boxSize, boxSize * 0.1f, boxSize), Quaternion.RotationZ(Mathf.PiOverTwo), new Vector3(0.0f, boxSize * boxScale, boxSize * boxScale));
-                Matrix.Multiply(ref m2, ref m1, out m3);
+                Matrix.Multiply(m2, m1, out m3);
                 MaterialInstance yzPlaneMaterialScale = (_activeAxis == Axis.YZ && !_isDisabled) ? _materialAxisFocus : _materialAxisY;
-                cubeMesh.Draw(ref renderContext, yzPlaneMaterialScale, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                cubeMesh.Draw(renderContext, yzPlaneMaterialScale, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 // Center box
                 Matrix.Scaling(gizmoModelsScale2RealGizmoSize, out m2);
-                Matrix.Multiply(ref m2, ref m1, out m3);
-                sphereMesh.Draw(ref renderContext, isCenter ? _materialAxisFocus : _materialSphere, ref m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                Matrix.Multiply(m2, m1, out m3);
+                sphereMesh.Draw(renderContext, isCenter ? _materialAxisFocus : _materialSphere, m3, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
 
                 break;
             }
@@ -278,7 +278,7 @@ namespace FlaxEditor.Gizmo
                 Transform t = _vertexSnapObject?.Transform ?? _vertexSnapObjectTo.Transform;
                 Vector3 p = t.LocalToWorld(_vertexSnapObject != null ? _vertexSnapPoint : _vertexSnapPointTo);
                 Matrix matrix = new Transform(p, t.Orientation, new Float3(gizmoModelsScale2RealGizmoSize)).GetWorld();
-                cubeMesh.Draw(ref renderContext, _materialSphere, ref matrix, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
+                cubeMesh.Draw(renderContext, _materialSphere, matrix, StaticFlags.None, true, DrawPass.Default, 0.0f, sortOrder);
             }
         }
     }

Source/Editor/Gizmo/TransformGizmoBase.Selection.cs

@@ -36,7 +36,7 @@ namespace FlaxEditor.Gizmo
         private bool IntersectsRotateCircle(Vector3 normal, ref Ray ray, out Real distance)
         {
             var plane = new Plane(Vector3.Zero, normal);
-            if (!plane.Intersects(ref ray, out distance))
+            if (!plane.Intersects(ray, out distance))
                 return false;
             Vector3 hitPoint = ray.Position + ray.Direction * distance;
             Real distanceNormalized = hitPoint.Length / RotateRadiusRaw;
@@ -50,8 +50,8 @@ namespace FlaxEditor.Gizmo
 
             // Transform ray into local space of the gizmo
             Ray localRay;
-            _gizmoWorld.WorldToLocalVector(ref ray.Direction, out localRay.Direction);
-            _gizmoWorld.WorldToLocal(ref ray.Position, out localRay.Position);
+            _gizmoWorld.WorldToLocalVector(ray.Direction, out localRay.Direction);
+            _gizmoWorld.WorldToLocal(ray.Position, out localRay.Position);
 
             // Find gizmo collisions with mouse
             Real closestIntersection = Real.MaxValue;
@@ -62,19 +62,19 @@ namespace FlaxEditor.Gizmo
             case Mode.Translate:
             {
                 // Axis boxes collision
-                if (XAxisBox.Intersects(ref localRay, out intersection) && intersection < closestIntersection)
+                if (XAxisBox.Intersects(localRay, out intersection) && intersection < closestIntersection)
                 {
                     _activeAxis = Axis.X;
                     closestIntersection = intersection;
                 }
 
-                if (YAxisBox.Intersects(ref localRay, out intersection) && intersection < closestIntersection)
+                if (YAxisBox.Intersects(localRay, out intersection) && intersection < closestIntersection)
                 {
                     _activeAxis = Axis.Y;
                     closestIntersection = intersection;
                 }
 
-                if (ZAxisBox.Intersects(ref localRay, out intersection) && intersection < closestIntersection)
+                if (ZAxisBox.Intersects(localRay, out intersection) && intersection < closestIntersection)
                 {
                     _activeAxis = Axis.Z;
                     closestIntersection = intersection;
@@ -83,25 +83,25 @@ namespace FlaxEditor.Gizmo
                 // Quad planes collision
                 if (closestIntersection >= float.MaxValue)
                     closestIntersection = float.MinValue;
-                if (XYBox.Intersects(ref localRay, out intersection) && intersection > closestIntersection)
+                if (XYBox.Intersects(localRay, out intersection) && intersection > closestIntersection)
                 {
                     _activeAxis = Axis.XY;
                     closestIntersection = intersection;
                 }
 
-                if (XZBox.Intersects(ref localRay, out intersection) && intersection > closestIntersection)
+                if (XZBox.Intersects(localRay, out intersection) && intersection > closestIntersection)
                 {
                     _activeAxis = Axis.ZX;
                     closestIntersection = intersection;
                 }
-                if (YZBox.Intersects(ref localRay, out intersection) && intersection > closestIntersection)
+                if (YZBox.Intersects(localRay, out intersection) && intersection > closestIntersection)
                 {
                     _activeAxis = Axis.YZ;
                     closestIntersection = intersection;
                 }
 
                 /*// Center
-                if (CenterBoxRaw.Intersects(ref localRay, out intersection) && intersection > closestIntersection)
+                if (CenterBoxRaw.Intersects(localRay, out intersection) && intersection > closestIntersection)
                 {
                     _activeAxis = Axis.Center;
                     closestIntersection = intersection;
@@ -133,17 +133,17 @@ namespace FlaxEditor.Gizmo
             case Mode.Scale:
             {
                 // Boxes collision
-                if (XAxisBox.Intersects(ref localRay, out intersection) && intersection < closestIntersection)
+                if (XAxisBox.Intersects(localRay, out intersection) && intersection < closestIntersection)
                 {
                     _activeAxis = Axis.X;
                     closestIntersection = intersection;
                 }
-                if (YAxisBox.Intersects(ref localRay, out intersection) && intersection < closestIntersection)
+                if (YAxisBox.Intersects(localRay, out intersection) && intersection < closestIntersection)
                 {
                     _activeAxis = Axis.Y;
                     closestIntersection = intersection;
                 }
-                if (ZAxisBox.Intersects(ref localRay, out intersection) && intersection < closestIntersection)
+                if (ZAxisBox.Intersects(localRay, out intersection) && intersection < closestIntersection)
                 {
                     _activeAxis = Axis.Z;
                     closestIntersection = intersection;
@@ -153,24 +153,24 @@ namespace FlaxEditor.Gizmo
                 if (closestIntersection >= float.MaxValue)
                     closestIntersection = float.MinValue;
 
-                if (XYBox.Intersects(ref localRay, out intersection) && intersection > closestIntersection)
+                if (XYBox.Intersects(localRay, out intersection) && intersection > closestIntersection)
                 {
                     _activeAxis = Axis.XY;
                     closestIntersection = intersection;
                 }
-                if (XZBox.Intersects(ref localRay, out intersection) && intersection > closestIntersection)
+                if (XZBox.Intersects(localRay, out intersection) && intersection > closestIntersection)
                 {
                     _activeAxis = Axis.ZX;
                     closestIntersection = intersection;
                 }
-                if (YZBox.Intersects(ref localRay, out intersection) && intersection > closestIntersection)
+                if (YZBox.Intersects(localRay, out intersection) && intersection > closestIntersection)
                 {
                     _activeAxis = Axis.YZ;
                     closestIntersection = intersection;
                 }
 
                 // Center
-                if (CenterBoxRaw.Intersects(ref localRay, out intersection) && intersection > closestIntersection)
+                if (CenterBoxRaw.Intersects(localRay, out intersection) && intersection > closestIntersection)
                 {
                     _activeAxis = Axis.Center;
                     closestIntersection = intersection;

Source/Editor/Gizmo/TransformGizmoBase.cs

@@ -212,10 +212,10 @@ namespace FlaxEditor.Gizmo
             Vector3 delta = Vector3.Zero;
             Ray ray = Owner.MouseRay;
 
-            Matrix.RotationQuaternion(ref _gizmoWorld.Orientation, out var rotationMatrix);
-            Matrix.Invert(ref rotationMatrix, out var invRotationMatrix);
+            Matrix.RotationQuaternion(_gizmoWorld.Orientation, out var rotationMatrix);
+            Matrix.Invert(rotationMatrix, out var invRotationMatrix);
             ray.Position = Vector3.Transform(ray.Position, invRotationMatrix);
-            Vector3.TransformNormal(ref ray.Direction, ref invRotationMatrix, out ray.Direction);
+            Vector3.TransformNormal(ray.Direction, invRotationMatrix, out ray.Direction);
 
             var position = Position;
             var planeXY = new Plane(Vector3.Backward, Vector3.Transform(position, invRotationMatrix).Z);
@@ -232,7 +232,7 @@ namespace FlaxEditor.Gizmo
             case Axis.X:
             {
                 var plane = planeDotXY > planeDotZX ? planeXY : planeZX;
-                if (ray.Intersects(ref plane, out intersection))
+                if (ray.Intersects(plane, out intersection))
                 {
                     _intersectPosition = ray.GetPoint(intersection);
                     if (!_lastIntersectionPosition.IsZero)
@@ -244,7 +244,7 @@ namespace FlaxEditor.Gizmo
             case Axis.Y:
             {
                 var plane = planeDotXY > planeDotYZ ? planeXY : planeYZ;
-                if (ray.Intersects(ref plane, out intersection))
+                if (ray.Intersects(plane, out intersection))
                 {
                     _intersectPosition = ray.GetPoint(intersection);
                     if (!_lastIntersectionPosition.IsZero)
@@ -256,7 +256,7 @@ namespace FlaxEditor.Gizmo
             case Axis.Z:
             {
                 var plane = planeDotZX > planeDotYZ ? planeZX : planeYZ;
-                if (ray.Intersects(ref plane, out intersection))
+                if (ray.Intersects(plane, out intersection))
                 {
                     _intersectPosition = ray.GetPoint(intersection);
                     if (!_lastIntersectionPosition.IsZero)
@@ -267,7 +267,7 @@ namespace FlaxEditor.Gizmo
             }
             case Axis.YZ:
             {
-                if (ray.Intersects(ref planeYZ, out intersection))
+                if (ray.Intersects(planeYZ, out intersection))
                 {
                     _intersectPosition = ray.GetPoint(intersection);
                     if (!_lastIntersectionPosition.IsZero)
@@ -288,7 +288,7 @@ namespace FlaxEditor.Gizmo
             }
             case Axis.XY:
             {
-                if (ray.Intersects(ref planeXY, out intersection))
+                if (ray.Intersects(planeXY, out intersection))
                 {
                     _intersectPosition = ray.GetPoint(intersection);
                     if (!_lastIntersectionPosition.IsZero)
@@ -309,7 +309,7 @@ namespace FlaxEditor.Gizmo
             }
             case Axis.ZX:
             {
-                if (ray.Intersects(ref planeZX, out intersection))
+                if (ray.Intersects(planeZX, out intersection))
                 {
                     _intersectPosition = ray.GetPoint(intersection);
                     if (!_lastIntersectionPosition.IsZero)
@@ -332,7 +332,7 @@ namespace FlaxEditor.Gizmo
             {
                 var gizmoToView = Position - Owner.ViewPosition;
                 var plane = new Plane(-Vector3.Normalize(gizmoToView), gizmoToView.Length);
-                if (ray.Intersects(ref plane, out intersection))
+                if (ray.Intersects(plane, out intersection))
                 {
                     _intersectPosition = ray.GetPoint(intersection);
                     if (!_lastIntersectionPosition.IsZero)
@@ -473,11 +473,11 @@ namespace FlaxEditor.Gizmo
                     dir = Float3.Forward * _gizmoWorld.Orientation;
 
                 Float3 viewDir = Owner.ViewPosition - Position;
-                Float3.Dot(ref viewDir, ref dir, out float dot);
+                Float3.Dot(viewDir, dir, out float dot);
                 if (dot < 0.0f)
                     delta *= -1;
 
-                Quaternion.RotationAxis(ref dir, delta, out _rotationDelta);
+                Quaternion.RotationAxis(dir, delta, out _rotationDelta);
                 break;
             }
 

Source/Editor/Gizmo/UIEditorGizmo.cs

@@ -240,7 +240,7 @@ namespace FlaxEditor
             {
                 foreach (var widget in _widgets)
                 {
-                    if (widget.Bounds.Contains(ref location))
+                    if (widget.Bounds.Contains(location))
                     {
                         // Initialize widget movement
                         _activeWidget = widget;
@@ -326,7 +326,7 @@ namespace FlaxEditor
             {
                 foreach (var widget in _widgets)
                 {
-                    if (widget.Bounds.Contains(ref location))
+                    if (widget.Bounds.Contains(location))
                     {
                         Cursor = widget.Cursor;
                         cursorChanged = true;
@@ -499,7 +499,7 @@ namespace FlaxEditor
                 var min = Float2.Min(upperLeft, bottomRight);
                 var max = Float2.Max(upperLeft, bottomRight);
                 var pixelRange = (max - min) * ViewScale;
-                Render2D.PushClip(ref viewRect);
+                Render2D.PushClip(viewRect);
                 DrawAxis(Float2.UnitX, viewRect, min.X, max.X, pixelRange.X);
                 DrawAxis(Float2.UnitY, viewRect, min.Y, max.Y, pixelRange.Y);
                 Render2D.PopClip();
@@ -605,7 +605,7 @@ namespace FlaxEditor
             if (!drawAnySelectedControl)
             {
                 drawAnySelectedControl = true;
-                Render2D.PushTransform(ref _cachedTransform);
+                Render2D.PushTransform(_cachedTransform);
             }
             var options = Editor.Instance.Options.Options.Visual;
 
@@ -643,10 +643,10 @@ namespace FlaxEditor
                 DrawControlWidget(uiControl, ref ur, ref mousePos, ref widgetHandleSize, viewScale, new Float2(1, -1), CursorType.SizeNESW);
                 DrawControlWidget(uiControl, ref bl, ref mousePos, ref widgetHandleSize, viewScale, new Float2(-1, 1), CursorType.SizeNESW);
                 DrawControlWidget(uiControl, ref br, ref mousePos, ref widgetHandleSize, viewScale, new Float2(1, 1), CursorType.SizeNWSE);
-                Float2.Lerp(ref ul, ref bl, 0.5f, out var el);
-                Float2.Lerp(ref ur, ref br, 0.5f, out var er);
-                Float2.Lerp(ref ul, ref ur, 0.5f, out var eu);
-                Float2.Lerp(ref bl, ref br, 0.5f, out var eb);
+                Float2.Lerp(ul, bl, 0.5f, out var el);
+                Float2.Lerp(ur, br, 0.5f, out var er);
+                Float2.Lerp(ul, ur, 0.5f, out var eu);
+                Float2.Lerp(bl, br, 0.5f, out var eb);
                 DrawControlWidget(uiControl, ref el, ref mousePos, ref widgetHandleSize, viewScale, new Float2(-1, 0), CursorType.SizeWE);
                 DrawControlWidget(uiControl, ref er, ref mousePos, ref widgetHandleSize, viewScale, new Float2(1, 0), CursorType.SizeWE);
                 DrawControlWidget(uiControl, ref eu, ref mousePos, ref widgetHandleSize, viewScale, new Float2(0, -1), CursorType.SizeNS);
@@ -749,7 +749,7 @@ namespace FlaxEditor
                 default: break;
                 }
             }
-            if (rect.Contains(ref mousePos))
+            if (rect.Contains(mousePos))
             {
                 Render2D.FillRectangle(rect, style.Foreground);
                 Render2D.DrawRectangle(rect, style.SelectionBorder);

Source/Editor/Gizmo/ViewportRubberBandSelector.cs

@@ -124,7 +124,7 @@ public sealed class ViewportRubberBandSelector
         public void ProjectPoint(Vector3 worldSpaceLocation, out Float2 viewportSpaceLocation)
         {
             worldSpaceLocation -= _origin;
-            _viewport.Project(ref worldSpaceLocation, ref _viewProjection, out var projected);
+            _viewport.Project(worldSpaceLocation, _viewProjection, out var projected);
             viewportSpaceLocation = new Float2((float)projected.X, (float)projected.Y);
         }
 
@@ -132,7 +132,7 @@ public sealed class ViewportRubberBandSelector
         {
             bounds.Minimum -= _origin;
             bounds.Maximum -= _origin;
-            return _frustum.Contains(ref bounds);
+            return _frustum.Contains(bounds);
         }
     }
 

Source/Editor/Managed/ManagedEditor.Internal.cpp

@@ -402,10 +402,11 @@ DEFINE_INTERNAL_CALL(void) EditorInternal_RunVisualScriptBreakpointLoopTick(floa
                 break;
             }
         }
+        WindowsManager::WindowsLocker.Unlock();
         for (const auto& e : inputEvents)
         {
             auto window = e.Target ? e.Target : defaultWindow;
-            if (!window)
+            if (!window || window->IsClosed())
                 continue;
             switch (e.Type)
             {
@@ -435,12 +436,14 @@ DEFINE_INTERNAL_CALL(void) EditorInternal_RunVisualScriptBreakpointLoopTick(floa
             case InputDevice::EventType::MouseMove:
                 window->OnMouseMove(window->ScreenToClient(e.MouseData.Position));
                 break;
+            case InputDevice::EventType::MouseMoveRelative:
+                window->OnMouseMoveRelative(e.MouseMovementData.PositionRelative);
+                break;
             case InputDevice::EventType::MouseLeave:
                 window->OnMouseLeave();
                 break;
             }
         }
-        WindowsManager::WindowsLocker.Unlock();
     }
     WindowsManager::WindowsLocker.Lock();
     Array<Window*, InlinedAllocation<32>> windows;

Source/Editor/Managed/ManagedEditor.cpp

@@ -334,7 +334,7 @@ Window* ManagedEditor::GetMainWindow()
     ASSERT(HasManagedInstance());
     const auto method = GetClass()->GetMethod("GetMainWindowPtr");
     ASSERT(method);
-    return (Window*)MUtils::Unbox<void*>(method->Invoke(GetManagedInstance(), nullptr, nullptr));
+    return (Window*)MUtils::Unbox<void*>(method->Invoke(GetManagedInstance(), nullptr, nullptr), true);
 }
 
 bool ManagedEditor::CanReloadScripts()
@@ -346,7 +346,7 @@ bool ManagedEditor::CanReloadScripts()
         Internal_CanReloadScripts = GetClass()->GetMethod("Internal_CanReloadScripts");
         ASSERT(Internal_CanReloadScripts);
     }
-    return MUtils::Unbox<bool>(Internal_CanReloadScripts->Invoke(GetManagedInstance(), nullptr, nullptr));
+    return MUtils::Unbox<bool>(Internal_CanReloadScripts->Invoke(GetManagedInstance(), nullptr, nullptr), true);
 }
 
 bool ManagedEditor::CanAutoBuildCSG()
@@ -365,7 +365,7 @@ bool ManagedEditor::CanAutoBuildCSG()
         Internal_CanAutoBuildCSG = GetClass()->GetMethod("Internal_CanAutoBuildCSG");
         ASSERT(Internal_CanAutoBuildCSG);
     }
-    return MUtils::Unbox<bool>(Internal_CanAutoBuildCSG->Invoke(GetManagedInstance(), nullptr, nullptr));
+    return MUtils::Unbox<bool>(Internal_CanAutoBuildCSG->Invoke(GetManagedInstance(), nullptr, nullptr), true);
 }
 
 bool ManagedEditor::CanAutoBuildNavMesh()
@@ -384,7 +384,7 @@ bool ManagedEditor::CanAutoBuildNavMesh()
         Internal_CanAutoBuildNavMesh = GetClass()->GetMethod("Internal_CanAutoBuildNavMesh");
         ASSERT(Internal_CanAutoBuildNavMesh);
     }
-    return MUtils::Unbox<bool>(Internal_CanAutoBuildNavMesh->Invoke(GetManagedInstance(), nullptr, nullptr));
+    return MUtils::Unbox<bool>(Internal_CanAutoBuildNavMesh->Invoke(GetManagedInstance(), nullptr, nullptr), true);
 }
 
 bool ManagedEditor::HasGameViewportFocus() const
@@ -397,7 +397,7 @@ bool ManagedEditor::HasGameViewportFocus() const
             Internal_HasGameViewportFocus = GetClass()->GetMethod("Internal_HasGameViewportFocus");
             ASSERT(Internal_HasGameViewportFocus);
         }
-        result = MUtils::Unbox<bool>(Internal_HasGameViewportFocus->Invoke(GetManagedInstance(), nullptr, nullptr));
+        result = MUtils::Unbox<bool>(Internal_HasGameViewportFocus->Invoke(GetManagedInstance(), nullptr, nullptr), true);
     }
     return result;
 }
@@ -495,7 +495,7 @@ bool ManagedEditor::OnAppExit()
         Internal_OnAppExit = GetClass()->GetMethod("Internal_OnAppExit");
         ASSERT(Internal_OnAppExit);
     }
-    return MUtils::Unbox<bool>(Internal_OnAppExit->Invoke(GetManagedInstance(), nullptr, nullptr));
+    return MUtils::Unbox<bool>(Internal_OnAppExit->Invoke(GetManagedInstance(), nullptr, nullptr), true);
 }
 
 void ManagedEditor::RequestStartPlayOnEditMode()

Source/Editor/Modules/ContentDatabaseModule.cs

@@ -1013,7 +1013,7 @@ namespace FlaxEditor.Modules
                     ContentItem item;
                     if (path.EndsWith(".cs"))
                         item = new CSharpScriptItem(path);
-                    else if (path.EndsWith(".cpp") || path.EndsWith(".h"))
+                    else if (path.EndsWith(".cpp") || path.EndsWith(".h") || path.EndsWith(".c") || path.EndsWith(".hpp"))
                         item = new CppScriptItem(path);
                     else if (path.EndsWith(".shader") || path.EndsWith(".hlsl"))
                         item = new ShaderSourceItem(path);

Source/Editor/Modules/ContentImportingModule.cs

@@ -222,7 +222,7 @@ namespace FlaxEditor.Modules
                 outputExtension = extension;
 
                 // Check if can place source files here
-                if (!targetLocation.CanHaveScripts && (extension == ".cs" || extension == ".cpp" || extension == ".h"))
+                if (!targetLocation.CanHaveScripts && (extension == ".cs" || extension == ".cpp" || extension == ".h" || extension == ".c" || extension == ".hpp"))
                 {
                     // Error
                     Editor.LogWarning(string.Format("Cannot import \'{0}\' to \'{1}\'. The target directory cannot have scripts.", inputPath, targetLocation.Node.Path));

Source/Editor/Modules/SimulationModule.cs

@@ -267,7 +267,7 @@ namespace FlaxEditor.Modules
         }
 
         /// <inheritdoc />
-        public override void OnPlayBegin()
+        public override void OnPlayBeginning()
         {
             Editor.Windows.FlashMainWindow();
 

Source/Editor/Modules/SourceCodeEditing/CodeEditingModule.cs

@@ -334,6 +334,9 @@ namespace FlaxEditor.Modules.SourceCodeEditing
                     }
                 }
             }
+            if (editor == null)
+                editor = Editor.Instance.CodeEditing.Editors[0];
+
             Editor.Instance.CodeEditing.SelectedEditor = editor;
         }
 

Source/Editor/Modules/SourceCodeEditing/DefaultSourceCodeEditor.cs

@@ -41,9 +41,9 @@ namespace FlaxEditor.Modules.SourceCodeEditing
             var vsCode = codeEditing.GetInBuildEditor(CodeEditorTypes.VSCode);
             var rider = codeEditing.GetInBuildEditor(CodeEditorTypes.Rider);
 
-#if PLATFORM_WINDOW
+#if PLATFORM_WINDOWS
             // Favor the newest Visual Studio
-            for (int i = (int)CodeEditorTypes.VS2019; i >= (int)CodeEditorTypes.VS2008; i--)
+            for (int i = (int)CodeEditorTypes.VS2026; i >= (int)CodeEditorTypes.VS2008; i--)
             {
                 var visualStudio = codeEditing.GetInBuildEditor((CodeEditorTypes)i);
                 if (visualStudio != null)
@@ -74,7 +74,7 @@ namespace FlaxEditor.Modules.SourceCodeEditing
         public string Name => "Default";
 
         /// <inheritdoc />
-        public string GenerateProjectCustomArgs => null;
+        public string GenerateProjectCustomArgs => _currentEditor?.GenerateProjectCustomArgs;
 
         /// <inheritdoc />
         public void OpenSolution()

Source/Editor/Modules/SourceCodeEditing/InBuildSourceCodeEditor.cs

@@ -22,71 +22,14 @@ namespace FlaxEditor.Modules.SourceCodeEditing
         public InBuildSourceCodeEditor(CodeEditorTypes type)
         {
             Type = type;
-            switch (type)
-            {
-            case CodeEditorTypes.Custom:
-                Name = "Custom";
-                break;
-            case CodeEditorTypes.SystemDefault:
-                Name = "System Default";
-                break;
-            case CodeEditorTypes.VS2008:
-                Name = "Visual Studio 2008";
-                break;
-            case CodeEditorTypes.VS2010:
-                Name = "Visual Studio 2010";
-                break;
-            case CodeEditorTypes.VS2012:
-                Name = "Visual Studio 2012";
-                break;
-            case CodeEditorTypes.VS2013:
-                Name = "Visual Studio 2013";
-                break;
-            case CodeEditorTypes.VS2015:
-                Name = "Visual Studio 2015";
-                break;
-            case CodeEditorTypes.VS2017:
-                Name = "Visual Studio 2017";
-                break;
-            case CodeEditorTypes.VS2019:
-                Name = "Visual Studio 2019";
-                break;
-            case CodeEditorTypes.VS2022:
-                Name = "Visual Studio 2022";
-                break;
-            case CodeEditorTypes.VS2026:
-                Name = "Visual Studio 2026";
-                break;
-            case CodeEditorTypes.VSCode:
-                Name = "Visual Studio Code";
-                break;
-            case CodeEditorTypes.VSCodeInsiders:
-                Name = "Visual Studio Code - Insiders";
-                break;
-            case CodeEditorTypes.Rider:
-                Name = "Rider";
-                break;
-            default: throw new ArgumentOutOfRangeException(nameof(type), type, null);
-            }
+            Name = CodeEditingManager.GetName(type);
         }
 
         /// <inheritdoc />
         public string Name { get; set; }
 
         /// <inheritdoc />
-        public string GenerateProjectCustomArgs
-        {
-            get
-            {
-                switch (Type)
-                {
-                case CodeEditorTypes.VSCodeInsiders:
-                case CodeEditorTypes.VSCode: return "-vscode -vs2022";
-                case CodeEditorTypes.Rider: return "-vs2022";
-                default: return null;
-                }
-            }
-        }
+        public string GenerateProjectCustomArgs => CodeEditingManager.GetGenerateProjectCustomArgs(Type);
 
         /// <inheritdoc />
         public void OpenSolution()

Source/Editor/Modules/UIModule.cs

@@ -16,7 +16,6 @@ using FlaxEditor.Windows;
 using FlaxEngine;
 using FlaxEngine.GUI;
 using FlaxEngine.Json;
-using DockHintWindow = FlaxEditor.GUI.Docking.DockHintWindow;
 using MasterDockPanel = FlaxEditor.GUI.Docking.MasterDockPanel;
 using FlaxEditor.Content.Settings;
 using FlaxEditor.Options;
@@ -29,6 +28,40 @@ namespace FlaxEditor.Modules
     /// <seealso cref="FlaxEditor.Modules.EditorModule" />
     public sealed class UIModule : EditorModule
     {
+        private class MainWindowDecorations : WindowDecorations
+        {
+            public MainWindowDecorations(RootControl window, bool iconOnly) 
+            : base(window, iconOnly)
+            {
+            }
+
+            /// <inheritdoc />
+            public override bool OnKeyDown(KeyboardKeys key)
+            {
+                if (base.OnKeyDown(key))
+                    return true;
+
+                // Fallback to the edit window for shortcuts
+                var editor = Editor.Instance;
+                return editor.Windows.EditWin.InputActions.Process(editor, this, key);
+            }
+            
+            /// <inheritdoc />
+            public override void DrawBorders()
+            {
+                // Draw main window borders if using a custom style
+                var win = RootWindow.Window;
+                if (win.IsMaximized)
+                    return;
+
+                var color = Editor.Instance.UI.StatusBar.StatusColor;
+                var rect = new Rectangle(0.5f, 0.5f, Parent.Width - 1.0f, Parent.Height - 1.0f - StatusBar.DefaultHeight);
+                Render2D.DrawLine(rect.UpperLeft, rect.UpperRight, color);
+                Render2D.DrawLine(rect.UpperLeft, rect.BottomLeft, color);
+                Render2D.DrawLine(rect.UpperRight, rect.BottomRight, color);
+            }
+        }
+        
         private Label _progressLabel;
         private ProgressBar _progressBar;
         private Button _outputLogButton;
@@ -144,6 +177,11 @@ namespace FlaxEditor.Modules
         /// </summary>
         public MainMenu MainMenu;
 
+        /// <summary>
+        /// The window decorations (title bar with buttons)
+        /// </summary>
+        public WindowDecorations WindowDecorations;
+
         /// <summary>
         /// The tool strip control.
         /// </summary>
@@ -426,19 +464,11 @@ namespace FlaxEditor.Modules
             InitToolstrip(mainWindow);
             InitStatusBar(mainWindow);
             InitDockPanel(mainWindow);
+            InitWindowDecorations(mainWindow);
 
             Editor.Options.OptionsChanged += OnOptionsChanged;
-
-            // Add dummy control for drawing the main window borders if using a custom style
-#if PLATFORM_WINDOWS
-            if (!Editor.Options.Options.Interface.UseNativeWindowSystem)
-#endif
-            {
-                mainWindow.AddChild(new CustomWindowBorderControl
-                {
-                    Size = Float2.Zero,
-                });
-            }
+            
+            mainWindow.PerformLayout(true);
         }
 
         private void InitViewportScaleOptions()
@@ -510,23 +540,6 @@ namespace FlaxEditor.Modules
             }
         }
 
-        private class CustomWindowBorderControl : Control
-        {
-            /// <inheritdoc />
-            public override void Draw()
-            {
-                var win = RootWindow.Window;
-                if (win.IsMaximized)
-                    return;
-
-                var color = Editor.Instance.UI.StatusBar.StatusColor;
-                var rect = new Rectangle(0.5f, 0.5f, Parent.Width - 1.0f, Parent.Height - 1.0f - StatusBar.DefaultHeight);
-                Render2D.DrawLine(rect.UpperLeft, rect.UpperRight, color);
-                Render2D.DrawLine(rect.UpperLeft, rect.BottomLeft, color);
-                Render2D.DrawLine(rect.UpperRight, rect.BottomRight, color);
-            }
-        }
-
         /// <inheritdoc />
         public override void OnEndInit()
         {
@@ -558,13 +571,6 @@ namespace FlaxEditor.Modules
             UpdateToolstrip();
         }
 
-        /// <inheritdoc />
-        public override void OnExit()
-        {
-            // Cleanup dock panel hint proxy windows (Flax will destroy them by var but it's better to clear them earlier)
-            DockHintWindow.Proxy.Dispose();
-        }
-
         private IColorPickerDialog ShowPickColorDialog(Control targetControl, Color initialValue, ColorValueBox.ColorPickerEvent colorChanged, ColorValueBox.ColorPickerClosedEvent pickerClosed, bool useDynamicEditing)
         {
             var dialog = new ColorPickerDialog(initialValue, colorChanged, pickerClosed, useDynamicEditing);
@@ -618,10 +624,12 @@ namespace FlaxEditor.Modules
 
         private void InitMainMenu(RootControl mainWindow)
         {
-            MainMenu = new MainMenu(mainWindow)
+            MainMenu = new MainMenu()
             {
                 Parent = mainWindow
             };
+            if (Utilities.Utils.UseCustomWindowDecorations(isMainWindow: true))
+                MainMenu.Height = 28;
 
             var inputOptions = Editor.Options.Options.Input;
 
@@ -714,6 +722,7 @@ namespace FlaxEditor.Modules
             _menuToolsBuildCSGMesh = cm.AddButton("Build CSG mesh", inputOptions.BuildCSG, Editor.BuildCSG);
             _menuToolsBuildNavMesh = cm.AddButton("Build Nav Mesh", inputOptions.BuildNav, Editor.BuildNavMesh);
             _menuToolsBuildAllMeshesSDF = cm.AddButton("Build all meshes SDF", inputOptions.BuildSDF, Editor.BuildAllMeshesSDF);
+            _menuToolsBuildAllMeshesSDF.LinkTooltip("Generates Sign Distance Field texture for all meshes used in loaded scenes. Use with 'F' key pressed to force rebuild SDF for meshes with existing one.");
             cm.AddSeparator();
             cm.AddButton("Game Cooker", Editor.Windows.GameCookerWin.FocusOrShow);
             _menuToolsCancelBuilding = cm.AddButton("Cancel building game", () => GameCooker.Cancel());
@@ -762,6 +771,20 @@ namespace FlaxEditor.Modules
             cm.AddButton("Information about Flax", () => new AboutDialog().Show());
         }
 
+        private void InitWindowDecorations(RootControl mainWindow)
+        {
+            ScriptsBuilder.GetBinariesConfiguration(out _, out _, out _, out var configuration);
+            var driver = Platform.DisplayServer;
+            if (!string.IsNullOrEmpty(driver))
+                driver = $" ({driver})";
+            
+            WindowDecorations = new MainWindowDecorations(mainWindow, !Utilities.Utils.UseCustomWindowDecorations(isMainWindow: true))
+            {
+                Parent = mainWindow,
+                IconTooltipText = $"{mainWindow.RootWindow.Title}\nVersion {Globals.EngineVersion}\nConfiguration {configuration}\nGraphics {GPUDevice.Instance.RendererType}{driver}",
+            };
+        }
+        
         private void OnOptionsChanged(EditorOptions options)
         {
             var inputOptions = options.Input;
@@ -1182,6 +1205,7 @@ namespace FlaxEditor.Modules
         {
             // Clear UI references (GUI cannot be used after window closing)
             MainMenu = null;
+            WindowDecorations = null;
             ToolStrip = null;
             MasterPanel = null;
             StatusBar = null;

Source/Editor/Modules/WindowsModule.cs

@@ -10,7 +10,6 @@ using System.Text;
 using System.Xml;
 using FlaxEditor.Content;
 using FlaxEditor.GUI.Dialogs;
-using FlaxEditor.GUI.Docking;
 using FlaxEditor.Windows;
 using FlaxEditor.Windows.Assets;
 using FlaxEditor.Windows.Profiler;
@@ -758,17 +757,19 @@ namespace FlaxEditor.Modules
             var settings = CreateWindowSettings.Default;
             settings.Title = "Flax Editor";
             settings.Size = Platform.DesktopSize * 0.75f;
+            settings.MinimumSize = new Float2(200, 150);
             settings.StartPosition = WindowStartPosition.CenterScreen;
             settings.ShowAfterFirstPaint = true;
-#if PLATFORM_WINDOWS
-            if (!Editor.Instance.Options.Options.Interface.UseNativeWindowSystem)
+            
+            if (Utilities.Utils.UseCustomWindowDecorations(isMainWindow: true))
             {
                 settings.HasBorder = false;
-
+#if PLATFORM_WINDOWS && !PLATFORM_SDL
                 // Skip OS sizing frame and implement it using LeftButtonHit
                 settings.HasSizingFrame = false;
+#endif
             }
-#elif PLATFORM_LINUX
+#if PLATFORM_LINUX && !PLATFORM_SDL
             settings.HasBorder = false;
 #endif
             MainWindow = Platform.CreateWindow(ref settings);
@@ -896,9 +897,11 @@ namespace FlaxEditor.Modules
 
                     if (type.IsAssignableTo(typeof(AssetEditorWindow)))
                     {
-                        var ctor = type.GetConstructor(new Type[] { typeof(Editor), typeof(AssetItem) });
                         var assetItem = Editor.ContentDatabase.FindAsset(winData.AssetItemID);
+                        var assetType = assetItem.GetType();
+                        var ctor = type.GetConstructor(new Type[] { typeof(Editor), assetType });
                         var win = (AssetEditorWindow)ctor.Invoke(new object[] { Editor.Instance, assetItem });
+
                         win.Show(winData.DockState, winData.DockState != DockState.Float ? winData.DockedTo : null, winData.SelectOnShow, winData.SplitterValue);
                         if (winData.DockState == DockState.Float)
                         {

Source/Editor/Options/InterfaceOptions.cs

@@ -179,6 +179,34 @@ namespace FlaxEditor.Options
             GameWindowThenRestore,
         }
 
+        /// <summary>
+        /// Options for type of window decorations to use.
+        /// </summary>
+        public enum WindowDecorationsType
+        {
+            /// <summary>
+            /// Determined automatically based on the system and any known compatibility issues with native decorations.
+            /// </summary>
+            Auto,
+            
+            /// <summary>
+            /// Automatically choose most compatible window decorations for child windows, prefer custom decorations on main window.
+            /// </summary>
+            [EditorDisplay(Name = "Auto (Child Only)")]
+            AutoChildOnly,
+            
+            /// <summary>
+            /// Use native system window decorations on all windows.
+            /// </summary>
+            Native,
+            
+            /// <summary>
+            /// Use custom client-side window decorations on all windows.
+            /// </summary>
+            [EditorDisplay(Name = "Client-side")]
+            ClientSide,
+        }
+
         /// <summary>
         /// Gets or sets the Editor User Interface scale. Applied to all UI elements, windows and text. Can be used to scale the interface up on a bigger display. Editor restart required.
         /// </summary>
@@ -268,7 +296,14 @@ namespace FlaxEditor.Options
         [EditorDisplay("Interface"), EditorOrder(322)]
         public bool ScrollToScriptOnAdd { get; set; } = true;
 
-#if PLATFORM_WINDOWS
+#if PLATFORM_SDL
+        /// <summary>
+        /// Gets or sets a value indicating whether use native window title bar decorations in child windows. Editor restart required.
+        /// </summary>
+        [DefaultValue(WindowDecorationsType.AutoChildOnly)]
+        [EditorDisplay("Interface"), EditorOrder(70), Tooltip("Determines whether use native window title bar decorations. Editor restart required.")]
+        public WindowDecorationsType WindowDecorations { get; set; } = WindowDecorationsType.AutoChildOnly;
+#elif PLATFORM_WINDOWS
         /// <summary>
         /// Gets or sets a value indicating whether use native window title bar. Editor restart required.
         /// </summary>
@@ -277,7 +312,7 @@ namespace FlaxEditor.Options
         public bool UseNativeWindowSystem { get; set; } = false;
 #endif
 
-#if PLATFORM_WINDOWS
+#if PLATFORM_SDL || PLATFORM_WINDOWS
         /// <summary>
         /// Gets or sets a value indicating whether a window containing a single tabs hides the tab bar. Editor restart recommended.
         /// </summary>

Source/Editor/SceneGraph/ActorNodeWithIcon.cs

@@ -36,8 +36,8 @@ namespace FlaxEditor.SceneGraph
             }
 
             var center = _actor.Transform.Translation;
-            ViewportIconsRenderer.GetBounds(ref center, ref ray.Ray.Position, out var sphere);
-            return CollisionsHelper.RayIntersectsSphere(ref ray.Ray, ref sphere, out distance);
+            ViewportIconsRenderer.GetBounds(center, ray.Ray.Position, out var sphere);
+            return CollisionsHelper.RayIntersectsSphere(ray.Ray, sphere, out distance);
         }
     }
 }

Source/Editor/SceneGraph/Actors/AnimatedModelNode.cs

@@ -109,10 +109,10 @@ namespace FlaxEditor.SceneGraph.Actors
 
                     // Skin vertex position with the current pose
                     var position = positionStream.GetFloat3(j);
-                    Float3.Transform(ref position, ref skinningMatrices[indices[0]], out Float3 pos0);
-                    Float3.Transform(ref position, ref skinningMatrices[indices[1]], out Float3 pos1);
-                    Float3.Transform(ref position, ref skinningMatrices[indices[2]], out Float3 pos2);
-                    Float3.Transform(ref position, ref skinningMatrices[indices[3]], out Float3 pos3);
+                    Float3.Transform(position, skinningMatrices[indices[0]], out Float3 pos0);
+                    Float3.Transform(position, skinningMatrices[indices[1]], out Float3 pos1);
+                    Float3.Transform(position, skinningMatrices[indices[2]], out Float3 pos2);
+                    Float3.Transform(position, skinningMatrices[indices[3]], out Float3 pos3);
                     position = pos0 * weights[0] + pos1 * weights[1] + pos2 * weights[2] + pos3 * weights[3];
 
                     // Add vertex to the bone list
@@ -269,8 +269,8 @@ namespace FlaxEditor.SceneGraph.Actors
                 for (int i = 0; i < boneVertices.Count; i++)
                 {
                     var pos = boneTransform.WorldToLocal(boneVertices[i]);
-                    Vector3.Min(ref boneLocalBounds.Minimum, ref pos, out boneLocalBounds.Minimum);
-                    Vector3.Max(ref boneLocalBounds.Maximum, ref pos, out boneLocalBounds.Maximum);
+                    Vector3.Min(boneLocalBounds.Minimum, pos, out boneLocalBounds.Minimum);
+                    Vector3.Max(boneLocalBounds.Maximum, pos, out boneLocalBounds.Maximum);
                 }
 
                 // Add collision shape
@@ -415,7 +415,7 @@ namespace FlaxEditor.SceneGraph.Actors
                 float bkLength = bk.Length;
                 if (bkLength > 0.0f)
                 {
-                    Float3.Transform(ref bk, ref matrix, out Float3 bkA);
+                    Float3.Transform(bk, matrix, out Float3 bkA);
                     bk = bkA / bkLength;
                 }
             }

Source/Editor/SceneGraph/Actors/BoxBrushNode.cs

@@ -184,7 +184,7 @@ namespace FlaxEditor.SceneGraph.Actors
             /// <inheritdoc />
             public override bool RayCastSelf(ref RayCastData ray, out Real distance, out Vector3 normal)
             {
-                return Brush.Intersects(Index, ref ray.Ray, out distance, out normal);
+                return Brush.Intersects(Index, ray.Ray, out distance, out normal);
             }
 
             /// <inheritdoc />
@@ -207,7 +207,7 @@ namespace FlaxEditor.SceneGraph.Actors
         /// <inheritdoc />
         public override bool RayCastSelf(ref RayCastData ray, out Real distance, out Vector3 normal)
         {
-            if (((BoxBrush)_actor).OrientedBox.Intersects(ref ray.Ray))
+            if (((BoxBrush)_actor).OrientedBox.Intersects(ray.Ray))
             {
                 for (int i = 0; i < ChildNodes.Count; i++)
                 {

Source/Editor/SceneGraph/Actors/BoxVolumeNode.cs

@@ -107,7 +107,7 @@ namespace FlaxEditor.SceneGraph.Actors
             {
                 normal = Vector3.Up;
                 var sphere = new BoundingSphere(Transform.Translation, 10.0f);
-                return sphere.Intersects(ref ray.Ray, out distance);
+                return sphere.Intersects(ray.Ray, out distance);
             }
 
             /// <inheritdoc />

Source/Editor/SceneGraph/Actors/CameraNode.cs

@@ -56,7 +56,7 @@ namespace FlaxEditor.SceneGraph.Actors
                 return false;
             }
 
-            return Camera.Internal_IntersectsItselfEditor(FlaxEngine.Object.GetUnmanagedPtr(_actor), ref ray.Ray, out distance);
+            return Camera.Internal_IntersectsItselfEditor(FlaxEngine.Object.GetUnmanagedPtr(_actor), ray.Ray, out distance);
         }
 
         /// <inheritdoc />

Source/Editor/SceneGraph/Actors/FoliageNode.cs

@@ -58,7 +58,7 @@ namespace FlaxEditor.SceneGraph.Actors
         public override Transform Transform
         {
             get => Actor.GetInstance(Index).Transform;
-            set => Actor.SetInstanceTransform(Index, ref value);
+            set => Actor.SetInstanceTransform(Index, value);
         }
 
         /// <inheritdoc />

Source/Editor/SceneGraph/Actors/NavLinkNode.cs

@@ -63,7 +63,7 @@ namespace FlaxEditor.SceneGraph.Actors
             {
                 normal = Vector3.Up;
                 var sphere = new BoundingSphere(Transform.Translation, 10.0f);
-                return sphere.Intersects(ref ray.Ray, out distance);
+                return sphere.Intersects(ray.Ray, out distance);
             }
 
             /// <inheritdoc />

Source/Editor/SceneGraph/Actors/SplineNode.cs

@@ -177,7 +177,7 @@ namespace FlaxEditor.SceneGraph.Actors
                 var actor = (Spline)_node.Actor;
                 var pos = actor.GetSplinePoint(Index);
                 var nodeSize = NodeSizeByDistance(Transform.Translation, PointNodeSize, ray.View.Position);
-                return new BoundingSphere(pos, nodeSize).Intersects(ref ray.Ray, out distance);
+                return new BoundingSphere(pos, nodeSize).Intersects(ray.Ray, out distance);
             }
 
             public override void OnDebugDraw(ViewportDebugDrawData data)
@@ -264,7 +264,7 @@ namespace FlaxEditor.SceneGraph.Actors
                 var actor = (Spline)_node.Actor;
                 var pos = actor.GetSplineTangent(_index, _isIn).Translation;
                 var tangentSize = NodeSizeByDistance(Transform.Translation, TangentNodeSize, ray.View.Position);
-                return new BoundingSphere(pos, tangentSize).Intersects(ref ray.Ray, out distance);
+                return new BoundingSphere(pos, tangentSize).Intersects(ray.Ray, out distance);
             }
 
             public override void OnDebugDraw(ViewportDebugDrawData data)

Source/Editor/SceneGraph/Actors/SpriteRenderNode.cs

@@ -37,15 +37,15 @@ namespace FlaxEditor.SceneGraph.Actors
             {
                 var up = Float3.Up;
                 Float3 translation = transform.Translation;
-                Matrix.Billboard(ref translation, ref viewPosition, ref up, ref viewDirection, out m2);
-                Matrix.Multiply(ref m1, ref m2, out m3);
-                Matrix.Scaling(ref transform.Scale, out m1);
-                Matrix.Multiply(ref m1, ref m3, out world);
+                Matrix.Billboard(translation, viewPosition, up, viewDirection, out m2);
+                Matrix.Multiply(m1, m2, out m3);
+                Matrix.Scaling(transform.Scale, out m1);
+                Matrix.Multiply(m1, m3, out world);
             }
             else
             {
                 transform.GetWorld(out m2);
-                Matrix.Multiply(ref m1, ref m2, out world);
+                Matrix.Multiply(m1, m2, out world);
             }
 
             OrientedBoundingBox bounds;
@@ -53,7 +53,7 @@ namespace FlaxEditor.SceneGraph.Actors
             world.Decompose(out bounds.Transformation);
 
             normal = -ray.Ray.Direction;
-            return bounds.Intersects(ref ray.Ray, out distance);
+            return bounds.Intersects(ray.Ray, out distance);
         }
 
         /// <inheritdoc />

Source/Editor/SceneGraph/Actors/StaticModelNode.cs

@@ -96,7 +96,7 @@ namespace FlaxEditor.SceneGraph.Actors
                         for (int i = 0; i < verts.Length; i++)
                         {
                             ref var v = ref verts[i];
-                            var distance = Float3.DistanceSquared(ref pointLocal, ref v);
+                            var distance = Float3.DistanceSquared(pointLocal, v);
                             if (distance <= minDistance)
                             {
                                 hit = true;

Source/Editor/SceneGraph/Actors/UICanvasNode.cs

@@ -64,7 +64,7 @@ namespace FlaxEditor.SceneGraph.Actors
             normal = Vector3.Up;
 
             if (Actor is UICanvas uiCanvas && uiCanvas.Is3D)
-                return uiCanvas.Bounds.Intersects(ref ray.Ray, out distance);
+                return uiCanvas.Bounds.Intersects(ray.Ray, out distance);
 
             distance = 0;
             return false;

Source/Editor/SceneGraph/SceneGraphNode.cs

@@ -352,7 +352,7 @@ namespace FlaxEditor.SceneGraph
             for (int i = 0; i < ChildNodes.Count; i++)
             {
                 ChildNodes[i].GetEditorSphere(out var childSphere);
-                BoundingSphere.Merge(ref sphere, ref childSphere, out sphere);
+                BoundingSphere.Merge(sphere, childSphere, out sphere);
             }
         }
 

Source/Editor/Scripting/CodeEditor.cpp

@@ -139,6 +139,34 @@ CodeEditor* CodeEditingManager::GetCodeEditor(CodeEditorTypes editorType)
     return nullptr;
 }
 
+String CodeEditingManager::GetName(CodeEditorTypes editorType)
+{
+    const auto editor = GetCodeEditor(editorType);
+    if (editor)
+    {
+        return editor->GetName();
+    }
+    else
+    {
+        LOG(Warning, "Missing code editor type {0}", (int32)editorType);
+        return String::Empty;
+    }
+}
+
+String CodeEditingManager::GetGenerateProjectCustomArgs(CodeEditorTypes editorType)
+{
+    const auto editor = GetCodeEditor(editorType);
+    if (editor)
+    {
+        return editor->GetGenerateProjectCustomArgs();
+    }
+    else
+    {
+        LOG(Warning, "Missing code editor type {0}", (int32)editorType);
+        return String::Empty;
+    }
+}
+
 void CodeEditingManager::OpenFile(CodeEditorTypes editorType, const String& path, int32 line)
 {
     const auto editor = GetCodeEditor(editorType);

Source/Editor/Scripting/CodeEditor.h

@@ -109,9 +109,18 @@ public:
     /// <summary>
     /// Gets the name of the editor.
     /// </summary>
-    /// <returns>The name</returns>
+    /// <returns>The name.</returns>
     virtual String GetName() const = 0;
 
+    /// <summary>
+    /// Gets the custom arguments for the Flax.Build tool to add when generating project files for this code editor.
+    /// </summary>
+    /// <returns>The custom arguments to generate project files.</returns>
+    virtual String GetGenerateProjectCustomArgs() const
+    {
+        return String::Empty;
+    }
+
     /// <summary>
     /// Opens the file.
     /// </summary>
@@ -169,6 +178,20 @@ public:
     /// <returns>The editor object or null if not found.</returns>
     static CodeEditor* GetCodeEditor(CodeEditorTypes editorType);
 
+    /// <summary>
+    /// Gets the name of the editor.
+    /// </summary>
+    /// <param name="editorType">The code editor type.</param>
+    /// <returns>The name.</returns>
+    API_FUNCTION() static String GetName(CodeEditorTypes editorType);
+
+    /// <summary>
+    /// Gets the custom arguments for the Flax.Build tool to add when generating project files for this code editor.
+    /// </summary>
+    /// <param name="editorType">The code editor type.</param>
+    /// <returns>The custom arguments to generate project files.</returns>
+    API_FUNCTION() static String GetGenerateProjectCustomArgs(CodeEditorTypes editorType);
+
     /// <summary>
     /// Opens the file. Handles async opening.
     /// </summary>

Source/Editor/Scripting/CodeEditors/RiderCodeEditor.cpp

@@ -257,12 +257,17 @@ String RiderCodeEditor::GetName() const
     return TEXT("Rider");
 }
 
+String RiderCodeEditor::GetGenerateProjectCustomArgs() const
+{
+    return TEXT("-vs2022");
+}
+
 void RiderCodeEditor::OpenFile(const String& path, int32 line)
 {
     // Generate project files if solution is missing
     if (!FileSystem::FileExists(_solutionPath))
     {
-        ScriptsBuilder::GenerateProject(TEXT("-vs2022"));
+        ScriptsBuilder::GenerateProject(GetGenerateProjectCustomArgs());
     }
 
     // Open file
@@ -290,7 +295,7 @@ void RiderCodeEditor::OpenSolution()
     // Generate project files if solution is missing
     if (!FileSystem::FileExists(_solutionPath))
     {
-        ScriptsBuilder::GenerateProject(TEXT("-vs2022"));
+        ScriptsBuilder::GenerateProject(GetGenerateProjectCustomArgs());
     }
 
     // Open solution
@@ -312,5 +317,5 @@ void RiderCodeEditor::OpenSolution()
 
 void RiderCodeEditor::OnFileAdded(const String& path)
 {
-    ScriptsBuilder::GenerateProject();
+    ScriptsBuilder::GenerateProject(GetGenerateProjectCustomArgs());
 }

Source/Editor/Scripting/CodeEditors/RiderCodeEditor.h

@@ -35,6 +35,7 @@ public:
     // [CodeEditor]
     CodeEditorTypes GetType() const override;
     String GetName() const override;
+    String GetGenerateProjectCustomArgs() const override;
     void OpenFile(const String& path, int32 line) override;
     void OpenSolution() override;
     void OnFileAdded(const String& path) override;

Source/Editor/Scripting/CodeEditors/VisualStudio/VisualStudioEditor.cpp

@@ -148,12 +148,17 @@ String VisualStudioEditor::GetName() const
     return String(ToString(_version));
 }
 
+String VisualStudioEditor::GetGenerateProjectCustomArgs() const
+{
+    return String::Format(TEXT("-{0}"), String(ToString(_version)).ToLower());
+}
+
 void VisualStudioEditor::OpenFile(const String& path, int32 line)
 {
     // Generate project files if solution is missing
     if (!FileSystem::FileExists(_solutionPath))
     {
-        ScriptsBuilder::GenerateProject();
+        ScriptsBuilder::GenerateProject(GetGenerateProjectCustomArgs());
     }
 
     // Open file
@@ -172,7 +177,7 @@ void VisualStudioEditor::OpenSolution()
     // Generate project files if solution is missing
     if (!FileSystem::FileExists(_solutionPath))
     {
-        ScriptsBuilder::GenerateProject();
+        ScriptsBuilder::GenerateProject(GetGenerateProjectCustomArgs());
     }
 
     // Open solution
@@ -187,7 +192,7 @@ void VisualStudioEditor::OpenSolution()
 void VisualStudioEditor::OnFileAdded(const String& path)
 {
     // TODO: finish dynamic files adding to the project - for now just regenerate it
-    ScriptsBuilder::GenerateProject();
+    ScriptsBuilder::GenerateProject(GetGenerateProjectCustomArgs());
     return;
     if (!FileSystem::FileExists(_solutionPath))
     {