_drag release offset investigation

This reverts commit 19852273b7.

Source/Editor/GUI/Docking/DockHintWindow.cs

@@ -25,11 +25,11 @@ namespace FlaxEditor.GUI.Docking
 
         private Rectangle _rLeft, _rRight, _rBottom, _rUpper, _rCenter;
 
-        private DockHintWindow(FloatWindowDockPanel toMove, bool lateDragStart)
+        private DockHintWindow(FloatWindowDockPanel toMove, bool draggingTab)
         {
             _toMove = toMove;
             _toSet = DockState.Float;
-            var window = _toMove?.Window.Window ?? Editor.Instance.Windows.MainWindow;
+            var window = toMove.Window.Window;
 
             // Remove focus from drag target
             //_toMove.Focus();
@@ -47,11 +47,7 @@ namespace FlaxEditor.GUI.Docking
                 window.Restore();
                 window.Position = Platform.MousePosition - mousePos * window.Size / previousSize;
             }
-
-            // Calculate dragging offset and move window to the destination position
-            var mouseClientPosition = Platform.MousePosition;
-            CalculateDragOffset(mouseClientPosition);
-
+            
             // 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)
@@ -62,7 +58,7 @@ namespace FlaxEditor.GUI.Docking
             
 
             // Get initial size
-            //_defaultWindowSize = window.Size;
+            _defaultWindowSize = window.Size;
 
             // Init proxy window
             /*Proxy.Init(ref _defaultWindowSize);
@@ -72,7 +68,7 @@ namespace FlaxEditor.GUI.Docking
             
             //FlaxEngine.Input.MouseMove += OnMouseMove;
             FlaxEngine.Scripting.Update += OnUpdate;
-            window.MouseUp += OnMouseUp;
+            _toMove.Window.Window.MouseUp += OnMouseUp;
             /*
             Proxy.Window.MouseUp += OnMouseUp;
             Proxy.Window.MouseMove += OnMouseMove;
@@ -93,18 +89,21 @@ namespace FlaxEditor.GUI.Docking
             // Hide base window
             //window.Hide();
 
-            window.Show();
+           // window.Show();
 
-            if (lateDragStart)
+            if (draggingTab)
             {
-                // The window needs some time to be fully ready for dragging
-                //_lateDragStartTimer = 1.5f;
-                window.StartDragging(_dragOffset);
+                _dragOffset = new Float2(window.Size.X / 2, 10.0f);
+                
+                window.StartDragging(_dragOffset, toMove.MasterPanel?.RootWindow.Window ?? Editor.Instance.Windows.MainWindow);
             }
             else
-                window.StartDragging(_dragOffset);
-
-            Dispose();
+            {
+                var mouseClientPosition = Platform.MousePosition;
+                CalculateDragOffset(mouseClientPosition);
+                
+                window.StartDragging(_dragOffset, window);
+            }
 
             //window.Show();
             //window.BringToFront();
@@ -113,8 +112,8 @@ namespace FlaxEditor.GUI.Docking
 
             // Perform layout again
             //windowGUI.PerformLayout();
-
-
+            
+            
             // Start tracking mouse
             //Proxy.Window.StartTrackingMouse(false);
         }
@@ -143,9 +142,9 @@ namespace FlaxEditor.GUI.Docking
             RemoveDockHints();
             
             //FlaxEngine.Input.MouseMove -= OnMouseMove;
-            var window = _toMove?.Window?.Window ?? Editor.Instance.Windows.MainWindow;
             FlaxEngine.Scripting.Update -= OnUpdate;
-            window.MouseUp -= OnMouseUp;
+            if (_toMove?.Window?.Window)
+                _toMove.Window.Window.MouseUp -= OnMouseUp;
 
             if (_toMove == null)
                 return;
@@ -155,6 +154,7 @@ namespace FlaxEditor.GUI.Docking
             // Check if window won't be docked
             if (_toSet == DockState.Float)
             {
+                var window = _toMove.Window?.Window;
                 if (window == null)
                     return;
                 var mouse = Platform.MousePosition;
@@ -244,7 +244,7 @@ namespace FlaxEditor.GUI.Docking
             window.Window.Position = mouse - new Float2(8, 8);*/
 
             // Get floating panel
-            var floatingPanelToMove = window?.GetChild(0) as FloatWindowDockPanel;
+            var floatingPanelToMove = window.GetChild(0) as FloatWindowDockPanel;
 
             return new DockHintWindow(floatingPanelToMove, true);
         }
@@ -284,7 +284,7 @@ namespace FlaxEditor.GUI.Docking
 
         private void CalculateDragOffset(Float2 mouseScreenPosition)
         {
-            var baseWinPos = _toMove?.Window.Window.Position ?? Editor.Instance.Windows.MainWindow.Position;
+            var baseWinPos = _toMove.Window.Window.Position;
             _dragOffset = mouseScreenPosition - baseWinPos;
 
             Editor.Log($"_dragOffset: {_dragOffset}, mouse: {mouseScreenPosition}, basewinpos: {baseWinPos}");
@@ -336,16 +336,13 @@ namespace FlaxEditor.GUI.Docking
             // Cache mouse position
             _mouse = Platform.MousePosition;
 
-            if (_toMove == null)
-                return;
-
             // Check intersection with any dock panel
             var uiMouse = _mouse;
             var dockPanel = _toMove.MasterPanel.HitTest(ref uiMouse, _toMove);
             
             if (dockPanel != _toDock)
             {
-                //Editor.Log($"UpdateRects: {_mouse}, panel: {dockPanel?.RootWindow?.Window?.Title}");
+                Editor.Log($"UpdateRects: {_mouse}, panel: {dockPanel?.RootWindow?.Window?.Title}");
                 
                 _toDock?.RootWindow.Window.RemoveDockHints();
                 RemoveDockHints();
@@ -425,8 +422,8 @@ namespace FlaxEditor.GUI.Docking
                     hoveredSizeOverride = new Float2(size.X, size.Y);
                 }
 
-                if (toSet != DockState.Float)
-                    Editor.Log($"docking: {toSet}");
+                //if (toSet != DockState.Float)
+                    
                 
                 _toSet = toSet;
             }
@@ -434,6 +431,8 @@ namespace FlaxEditor.GUI.Docking
             {
                 _toSet = DockState.Float;
             }
+            
+            Editor.Log($"docking: {_toSet}, pos: {_mouse}");
 
             // Calculate proxy/dock/window rectangles
             if (_toDock == null)
@@ -524,15 +523,10 @@ namespace FlaxEditor.GUI.Docking
         private void OnUpdate()
         {
             //Editor.Log("OnUpdate");
-            if (_lateDragStartTimer > 0)
-            {
-                _lateDragStartTimer -= Time.UnscaledDeltaTime;
-                if (_lateDragStartTimer <= 0)
-                    _toMove.Window.Window.StartDragging(_dragOffset);
-            }
             var mousePos = Platform.MousePosition;
             if (_mouse != mousePos)
             {
+                Editor.Log($"mouse pos {_mouse} -> {mousePos}");
                 OnMouseMove(mousePos);
             }
         }

Source/Editor/GUI/Docking/DockPanel.cs

@@ -280,49 +280,16 @@ namespace FlaxEditor.GUI.Docking
                 _selectedTab = tab;
                 if (_selectedTab != null)
                 {
-                    //_selectedTab.UnlockChildrenRecursive();
+                    _selectedTab.UnlockChildrenRecursive();
                     _selectedTab.Parent = proxy;
-                    //if (autoFocus)
-                    //    _selectedTab.Focus();
+                    if (autoFocus)
+                        _selectedTab.Focus();
                 }
-                //OnSelectedTabChanged();
+                OnSelectedTabChanged();
             }
             else if (autoFocus && _selectedTab != null && !_selectedTab.ContainsFocus)
             {
-                //_selectedTab.Focus();
-            }
-        }
-        
-        public void SelectTab2(DockWindow tab, bool autoFocus = true)
-        {
-            // Check if tab will change
-            if (_selectedTab != tab)
-            {
-                // Change
-                ContainerControl proxy;
-                if (_selectedTab != null)
-                {
-                    proxy = _selectedTab.Parent;
-                    _selectedTab.Parent = null;
-                }
-                else
-                {
-                    CreateTabsProxy();
-                    proxy = _tabsProxy;
-                }
-                _selectedTab = tab;
-                if (_selectedTab != null)
-                {
-                    //_selectedTab.UnlockChildrenRecursive();
-                    _selectedTab.Parent = proxy;
-                    //if (autoFocus)
-                    //    _selectedTab.Focus();
-                }
-                //OnSelectedTabChanged();
-            }
-            else if (autoFocus && _selectedTab != null && !_selectedTab.ContainsFocus)
-            {
-                //_selectedTab.Focus();
+                _selectedTab.Focus();
             }
         }
 
@@ -634,7 +601,7 @@ namespace FlaxEditor.GUI.Docking
             _tabs.Add(window);
             window.ParentDockPanel = this;
             if (autoSelect)
-                SelectTab2(window);
+                SelectTab(window);
         }
 
         private void CreateTabsProxy()

Source/Editor/GUI/Docking/DockWindow.cs

@@ -185,21 +185,19 @@ namespace FlaxEditor.GUI.Docking
         {
             Undock();
 
-            
             // Create window
             var winSize = size.LengthSquared > 4 ? size : DefaultSize;
             var window = FloatWindowDockPanel.CreateFloatWindow(_masterPanel.Root, location, winSize, position, _title);
             var windowGUI = window.GUI;
-            
+
             // Create dock panel for the window
             var dockPanel = new FloatWindowDockPanel(_masterPanel, windowGUI);
-            dockPanel.DockWindowInternal(DockState.DockFill, this, true);
-            /*
+            dockPanel.DockWindowInternal(DockState.DockFill, this);
+
             // Perform layout
             Visible = true;
             windowGUI.UnlockChildrenRecursive();
             windowGUI.PerformLayout();
-            */
 
             // Show
             /*FlaxEngine.Scripting.InvokeOnUpdate(() =>
@@ -467,10 +465,10 @@ namespace FlaxEditor.GUI.Docking
         /// <inheritdoc />
         public override void Focus()
         {
-            /*base.Focus();
+            base.Focus();
 
             SelectTab();
-            BringToFront();*/
+            BringToFront();
         }
 
         /// <inheritdoc />

Source/Editor/GUI/Docking/FloatWindowDockPanel.cs

@@ -51,9 +51,9 @@ namespace FlaxEditor.GUI.Docking
             if (_window == null)
                 return;
 
-            _window.Window.StartDragging(Float2.Zero);
             // Create docking hint window
-            //DockHintWindow.Create(this);
+            DockHintWindow.Create(this);
+            //_window.Window.StartDragging(Float2.Zero);
         }
 
         /// <summary>

Source/Engine/Engine/Time.h

@@ -16,6 +16,7 @@ API_CLASS(Static) class FLAXENGINE_API Time
     friend class Engine;
     friend class TimeService;
     friend class PhysicsSettings;
+    friend class SDLWindow;
 
 public:
     /// <summary>

Source/Engine/Platform/Base/WindowBase.h

@@ -741,7 +741,8 @@ public:
     /// Start dragging the window.
     /// </summary>
     /// <param name="offset">The position offset for drag from top-left corner.</param>
-    API_FUNCTION() virtual void StartDragging(const Float2& offset)
+    /// <param name="dragSourceWindow">The source window where the dragging is started from. For attached tabs, this is the parent window</param>
+    API_FUNCTION() virtual void StartDragging(const Float2& offset, Window* dragSourceWindow)
     {
     }
 

Source/Engine/Platform/SDL/SDLInput.cpp

@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
 
+#include "Engine/Engine/Engine.h"
 #if PLATFORM_SDL
 
 #include "SDLInput.h"
@@ -496,14 +497,17 @@ bool SDLInput::HandleEvent(SDLWindow* window, SDL_Event& event)
         }
         return true;
     }
-    case SDL_EVENT_DROP_POSITION:
+    /*case SDL_EVENT_DROP_POSITION:
     {
         // We are not receiving mouse motion events during drag-and-drop
         auto dpiScale = window->GetDpiScale();
-        const Float2 mousePos = window->ClientToScreen({ event.drop.x * dpiScale, event.drop.y * dpiScale});
+        //const Float2 mousePos(event.drop.x * dpiScale, event.drop.y * dpiScale);// = window->ClientToScreen({ event.drop.x * dpiScale, event.drop.y * dpiScale});
+        Float2 mousePos = window->ClientToScreen({ event.drop.x * dpiScale, event.drop.y * dpiScale});
+        if (window != Engine::MainWindow)
+            mousePos = window->GetPosition() - mousePos;
         Input::Mouse->OnMouseMove(mousePos, window);
         return true;
-    }
+    }*/
     case SDL_EVENT_WINDOW_MOUSE_LEAVE:
     {
         Input::Mouse->OnMouseLeave(window);

Source/Engine/Platform/SDL/SDLPlatform.Linux.cpp

@@ -2,6 +2,8 @@
 
 #include <errno.h>
 
+#include "Engine/Engine/Time.h"
+#include "Engine/Graphics/RenderTask.h"
 #include "Engine/Platform/Base/DragDropHelper.h"
 #include "Engine/Platform/Unix/UnixFile.h"
 
@@ -497,8 +499,8 @@ void WaylandDataSource_Cancelled(void* data, wl_data_source *source)
     wl_data_source_destroy(source);
 
     // The mouse up event was ignored earlier, release the button now
-    SDLWindow* window = ((LinuxDropTextData*)inputData)->Window;
-    Input::Mouse->OnMouseUp(Platform::GetMousePosition(), MouseButton::Left, window);
+    //SDLWindow* window = ((LinuxDropTextData*)inputData)->Window;
+    //Input::Mouse->OnMouseUp(Platform::GetMousePosition(), MouseButton::Left, window);
 
     /*if (DragTargetWindow != nullptr)
     {
@@ -515,7 +517,7 @@ void WaylandDataSource_DnDDropPerformed(void *data,
 {
     // The destination is being asked to begin DnD, asking confirmation with ASK actionh
     //SDLWindow* window = static_cast<SDLWindow*>(data);
-    //LOG(Info, "WaylandDataSource_DnDDropPerformed");
+    LOG(Info, "WaylandDataSource_DnDDropPerformed");
 }
 
 void WaylandDataSource_DnDFinished(void *data,
@@ -531,8 +533,8 @@ void WaylandDataSource_DnDFinished(void *data,
     wl_data_source_destroy(wl_data_source);
 
     // The mouse up event was ignored earlier, release the button now
-    SDLWindow* window = ((LinuxDropTextData*)inputData)->Window;
-    Input::Mouse->OnMouseUp(Platform::GetMousePosition(), MouseButton::Left, window);
+    //SDLWindow* window = ((LinuxDropTextData*)inputData)->Window;
+    //Input::Mouse->OnMouseUp(Platform::GetMousePosition(), MouseButton::Left, window);
 
     /*if (DragTargetWindow != nullptr)
     {
@@ -576,7 +578,8 @@ public:
     int64 ExitFlag = 0;
     StringView data;
     SDLWindow* window;
-    SDLWindow* mainwindow;
+    SDLWindow* dragSourceWindow;
+    Float2 dragOffset = Float2::Zero;
     int64 dragOver = 0;
     int64 waitFlag = 0;
 
@@ -614,7 +617,7 @@ public:
             /*auto */dataDevice = wl_data_device_manager_get_data_device(wrappedManager, WaylandSeat);
             wl_data_device_add_listener(dataDevice, &WaylandDataDeviceListener, nullptr);
             wl_display_roundtrip(wrappedDisplay);
-            wl_data_device_set_user_data(dataDevice, dragWindow ? mainwindow : window);
+            wl_data_device_set_user_data(dataDevice, dragWindow ? dragSourceWindow : window);
             wrappedDataDevice = (wl_data_device*)wl_proxy_create_wrapper(dataDevice);
             wl_proxy_set_queue((wl_proxy*)wrappedDataDevice, WaylandQueue);
         }
@@ -641,7 +644,7 @@ public:
         textData.Window = window;
         textData.dragOver = &dragOver;
         auto _window = window->GetSDLWindow();
-        auto _mainwindow = mainwindow->GetSDLWindow();
+        auto _mainwindow = dragSourceWindow->GetSDLWindow();
         //if (!window->IsVisible())
         //    _window = mainwindow->GetSDLWindow();
         //wl_data_source_set_user_data(wrappedDataSource, &textData);
@@ -677,8 +680,7 @@ public:
                     wl_proxy_set_queue((wl_proxy*)wrappedToplevel, WaylandQueue);
                     toplevelDrag = xdg_toplevel_drag_manager_v1_get_xdg_toplevel_drag(DragManager, dataSource);
 
-                    Float2 offset(100, 240);
-                    Float2 scaledOffset = offset / window->GetDpiScale();
+                    Float2 scaledOffset = dragOffset / window->GetDpiScale();
                     //xdg_toplevel_drag_v1_attach(toplevelDrag, toplevel, (int32)scaledOffset.X, (int32)scaledOffset.Y);
 
                     xdg_toplevel_drag_v1_attach(toplevelDrag, wrappedToplevel, (int32)scaledOffset.X, (int32)scaledOffset.Y);
@@ -743,8 +745,7 @@ public:
                         wl_proxy_set_queue((wl_proxy*)wrappedToplevel, WaylandQueue);
                         toplevelDrag = xdg_toplevel_drag_manager_v1_get_xdg_toplevel_drag(DragManager, dataSource);
 
-                        Float2 offset(100, 240);
-                        Float2 scaledOffset = offset / window->GetDpiScale();
+                        Float2 scaledOffset = dragOffset / window->GetDpiScale();
                         //xdg_toplevel_drag_v1_attach(toplevelDrag, toplevel, (int32)scaledOffset.X, (int32)scaledOffset.Y);
 
                         xdg_toplevel_drag_v1_attach(toplevelDrag, wrappedToplevel, (int32)scaledOffset.X, (int32)scaledOffset.Y);
@@ -809,18 +810,52 @@ public:
     }
 };
 
-DragDropEffect Window::DoDragDropWayland(const StringView& data)
+DragDropEffect Window::DoDragDropWayland(const StringView& data, Window* dragSourceWindow, Float2 dragOffset)
 {
     // For drag-and-drop, we need to setup the event queue in separate thread to avoid racing issues
     // while SDL is dispatching the main Wayland event queue when receiving the data offer from us.
 
+    // Show()?
+    {
+        if (!_visible)
+        {
+            if (_showAfterFirstPaint)
+            {
+                if (RenderTask)
+                    RenderTask->Enabled = true;
+            }
+            else
+                SDL_ShowWindow(_window);
+        }
+        WindowBase::Show();
+    }
+
+    //while (true)
+    {
+        const double time = Platform::GetTimeSeconds();
+
+        // Update game logic
+        if (Time::OnBeginUpdate(time))
+        {
+            Engine::OnUpdate();
+            Engine::OnLateUpdate();
+            Time::OnEndUpdate();
+        }
+        
+        SDLPlatform::Tick();
+        Engine::OnDraw();
+        
+        Platform::Sleep(1);
+    }
+
     waylandDraggingActive = true;
     
     auto task = New<WaylandDragDropJob>();
     task->data = data;
     task->window = this;
-    task->mainwindow = Engine::MainWindow;
+    task->dragSourceWindow = dragSourceWindow; // Needs to be the parent window when dragging a tab to window
     task->dragOver = 0;
+    task->dragOffset = dragOffset;
     Task::StartNew(task);
     while (task->GetState() == TaskState::Queued)
         Platform::Sleep(1);
@@ -837,8 +872,8 @@ DragDropEffect Window::DoDragDropWayland(const StringView& data)
     while (Platform::AtomicRead(&task->dragOver) == 0)
     {
         SDLPlatform::Tick();
-        //Scripting::Update(); // For docking updates
-        //Engine::OnDraw();
+        Engine::OnUpdate();//Scripting::Update(); // For docking updates
+        Engine::OnDraw();
 
         Platform::Sleep(1);
 
@@ -851,6 +886,9 @@ DragDropEffect Window::DoDragDropWayland(const StringView& data)
         }
     }
 
+    // The mouse up event was ignored earlier, release the button now
+    Input::Mouse->OnMouseUp(Platform::GetMousePosition(), MouseButton::Left, this);
+
     Platform::AtomicStore(&task->ExitFlag, 1);
     task->Wait();
     
@@ -1567,6 +1605,11 @@ void SDLPlatform::SetHighDpiAwarenessEnabled(bool enable)
 
 bool SDLPlatform::UsesWayland()
 {
+    if (xDisplay == nullptr && WaylandDisplay == nullptr)
+    {
+        // In case the X11 display pointer has not been updated yet
+        return strcmp(SDL_GetCurrentVideoDriver(), "wayland") == 0;
+    }
     return WaylandDisplay != nullptr;
 }
 
@@ -1582,6 +1625,11 @@ bool SDLPlatform::UsesXWayland()
 
 bool SDLPlatform::UsesX11()
 {
+    if (xDisplay == nullptr && WaylandDisplay == nullptr)
+    {
+        // In case the X11 display pointer has not been updated yet
+        return strcmp(SDL_GetCurrentVideoDriver(), "x11") == 0;
+    }
     return xDisplay != nullptr;
 }
 

Source/Engine/Platform/SDL/SDLPlatform.cpp

@@ -175,7 +175,7 @@ void SDLPlatform::Tick()
         }
         else
         {
-/*#if PLATFORM_LINUX
+#if PLATFORM_LINUX
             String dockHintWindow("DockHint.Window");
             Window* window = nullptr;
             WindowsManager::WindowsLocker.Lock();
@@ -197,7 +197,7 @@ void SDLPlatform::Tick()
                 mousePos += Float2(static_cast<float>(left), static_cast<float>(-top));
                 Input::Mouse->OnMouseMove(mousePos, window);
             }
-#endif*/
+#endif
         }
     }
 

Source/Engine/Platform/SDL/SDLWindow.cpp

@@ -140,7 +140,7 @@ SDLWindow::SDLWindow(const CreateWindowSettings& settings)
         flags |= SDL_WINDOW_RESIZABLE;
     if (_settings.IsTopmost)
         flags |= SDL_WINDOW_ALWAYS_ON_TOP;
-    if (_settings.SupportsTransparency)
+    //if (_settings.SupportsTransparency)
         flags |= SDL_WINDOW_TRANSPARENT;
 
     // Disable parenting of child windows as those are always on top of the parent window and never show up in taskbar
@@ -406,7 +406,7 @@ SDLWindow* SDLWindow::GetWindowWithSDLWindow(SDL_Window* window)
 
 void SDLWindow::HandleEvent(SDL_Event& event)
 {
-    if (_isClosing || waylandDraggingActive)
+    if (_isClosing)
         return;
 
     switch (event.type)
@@ -640,16 +640,41 @@ void SDLWindow::HandleEvent(SDL_Event& event)
         return;
     }
     case SDL_EVENT_DROP_BEGIN:
+    case SDL_EVENT_DROP_POSITION:
+    case SDL_EVENT_DROP_FILE:
+    case SDL_EVENT_DROP_TEXT:
+    case SDL_EVENT_DROP_COMPLETE:
     {
-        LOG(Info, "SDL_EVENT_DROP_BEGIN");
+        //LOG(Info, "SDL_EVENT_DROP_BEGIN");
+
+        static Float2 dragStartPosition = Float2::Zero;
 
         auto dpiScale = GetDpiScale();
-        const Float2 mousePos = ClientToScreen({ event.drop.x * dpiScale, event.drop.y * dpiScale});
+        //const Float2 mousePos = ClientToScreen({ event.drop.x * dpiScale, event.drop.y * dpiScale});
+        const Float2 mousePos = dragStartPosition + Float2(event.drop.x * dpiScale, event.drop.y * dpiScale);
         DragDropEffect effect = DragDropEffect::None;
         auto daata = event.drop.data;
 
         SDLDropTextData dropData;
-        OnDragEnter(&dropData, mousePos, effect);
+
+        
+
+        if (event.type == SDL_EVENT_DROP_BEGIN)
+        {
+            dragStartPosition = Platform::GetMousePosition();
+            OnDragEnter(&dropData, mousePos, effect);
+        }
+        else if (event.type == SDL_EVENT_DROP_POSITION)
+        {
+            Input::Mouse->OnMouseMove(mousePos, this);
+            OnDragOver(&dropData, mousePos, effect);
+        }
+        else if (event.type == SDL_EVENT_DROP_FILE)
+            OnDragDrop(&dropData, mousePos, effect);
+        else if (event.type == SDL_EVENT_DROP_TEXT)
+            OnDragDrop(&dropData, mousePos, effect);
+        else if (event.type == SDL_EVENT_DROP_COMPLETE)
+            OnDragLeave();
         /*Focus();
         Float2 mousePosition;
         SDL_GetGlobalMouseState(&mousePosition.X, &mousePosition.Y);
@@ -659,21 +684,19 @@ void SDLWindow::HandleEvent(SDL_Event& event)
         SDLDropTextData dropData;
         OnDragEnter(&dropData, mousePosition, effect);
         OnDragOver(&dropData, mousePosition, effect);*/
-        return;
+        break;
     }
-    case SDL_EVENT_DROP_POSITION:
+    /*case SDL_EVENT_DROP_POSITION:
     {
         auto dpiScale = GetDpiScale();
-        const Float2 mousePos = ClientToScreen({ event.drop.x * dpiScale, event.drop.y * dpiScale});
+        //const Float2 mousePos = ClientToScreen({ event.drop.x * dpiScale, event.drop.y * dpiScale});
+        const Float2 mousePos(event.drop.x * dpiScale, event.drop.y * dpiScale);
         DragDropEffect effect = DragDropEffect::None;
         auto daata = event.drop.data;
 
         SDLDropTextData dropData;
         OnDragOver(&dropData, mousePos, effect);
-        /*DragDropEffect effect = DragDropEffect::None;
 
-        SDLDropTextData dropData;
-        OnDragOver(&dropData, Float2(static_cast<float>(event.drop.x), static_cast<float>(event.drop.y)), effect);*/
         break;
     }
     case SDL_EVENT_DROP_FILE:
@@ -688,16 +711,7 @@ void SDLWindow::HandleEvent(SDL_Event& event)
         OnDragDrop(&dropData, mousePos, effect);
 
         
-        /*SDLDropFilesData dropData;
-        dropData.Files.Add(StringAnsi(event.drop.data).ToString()); // TODO: collect multiple files at once?
 
-        Focus();
-        
-        Float2 mousePosition;
-        SDL_GetGlobalMouseState(&mousePosition.X, &mousePosition.Y);
-        mousePosition = ScreenToClient(mousePosition);
-        DragDropEffect effect = DragDropEffect::None;
-        OnDragDrop(&dropData, mousePosition, effect);*/
         return;
     }
     case SDL_EVENT_DROP_TEXT:
@@ -713,16 +727,6 @@ void SDLWindow::HandleEvent(SDL_Event& event)
         SDLDropTextData dropData;
         OnDragDrop(&dropData, mousePos, effect);
         
-        /*SDLDropTextData dropData;
-        String str = StringAnsi(event.drop.data).ToString();
-        dropData.Text = StringView(str);
-
-        Focus();
-        Float2 mousePosition;
-        SDL_GetGlobalMouseState(&mousePosition.X, &mousePosition.Y);
-        mousePosition = ScreenToClient(mousePosition);
-        DragDropEffect effect = DragDropEffect::None;
-        OnDragDrop(&dropData, mousePosition, effect);*/
         return;
     }
     case SDL_EVENT_DROP_COMPLETE:
@@ -740,7 +744,7 @@ void SDLWindow::HandleEvent(SDL_Event& event)
             //_dragOver = false;
         }
         return;
-    }
+    }*/
 #endif
     case SDL_EVENT_WINDOW_MOUSE_LEAVE:
     {
@@ -792,10 +796,10 @@ void SDLWindow::Show()
     }
 
     SDL_ShowWindow(_window);
-    /*if (_settings.AllowInput && _settings.ActivateWhenFirstShown)
+    if (_settings.AllowInput && _settings.ActivateWhenFirstShown)
         Focus();
     else if (_settings.Parent == nullptr)
-        BringToFront();*/
+        BringToFront();
     
     // Reused top-most windows (DockHintWindow) doesn't stay on top for some reason
     if (_settings.IsTopmost && _settings.Type != WindowType::Tooltip)
@@ -1108,7 +1112,7 @@ String SDLWindow::GetTitle() const
 
 void SDLWindow::SetTitle(const StringView& title)
 {
-    //SDL_SetWindowTitle(_window, title.ToStringAnsi().Get());
+    SDL_SetWindowTitle(_window, title.ToStringAnsi().Get());
 }
 
 void SDLWindow::StartTrackingMouse(bool useMouseScreenOffset)
@@ -1299,11 +1303,26 @@ void SDLWindow::UpdateCursor()
     wl_display_flush((wl_display*)SDL_GetPointerProperty(SDL_GetGlobalProperties(), SDL_PROP_GLOBAL_VIDEO_WAYLAND_WL_DISPLAY_POINTER, nullptr));
 }*/
 
-void SDLWindow::StartDragging(const Float2& offset)
+void SDLWindow::StartDragging(const Float2& offset, Window* dragSourceWindow)
 {
     LOG(Info, "StartDragging {}", offset);
 
-    DoDragDropWayland(String("notawindow"));
+    Float2 dragOffset = offset;
+    if (_settings.HasBorder)
+    {
+#if PLATFORM_LINUX
+        if (SDLPlatform::UsesWayland() && dragSourceWindow == this)
+        {
+            // Wayland includes the decorations in the client-space coordinates, adjust the offset for it.
+            // Assume the title decoration is 25px thick...
+            float topOffset = 25.0f;
+            dragOffset += Float2(0.0f, topOffset);
+        }
+#endif
+    }
+
+    SetOpacity(0.1f);
+    DoDragDropWayland(String("notawindow"), dragSourceWindow, dragOffset);
 /*
     _dragOver = true;
 
@@ -1339,6 +1358,8 @@ void SDLWindow::StartDragging(const Float2& offset)
 void SDLWindow::StopDragging()
 {
     LOG(Info, "StopDragging");
+
+    SetOpacity(1.0f);
 /*
     wl_data_device_set_user_data(dataDevice, nullptr);
     _dragOver = false;

Source/Engine/Platform/SDL/SDLWindow.h

@@ -62,7 +62,7 @@ private:
     void UpdateCursor();
 
 #if PLATFORM_LINUX
-    DragDropEffect DoDragDropWayland(const StringView& data);
+    DragDropEffect DoDragDropWayland(const StringView& data, Window* dragSourceWindow = nullptr, Float2 dragOffset = Float2::Zero);
     DragDropEffect DoDragDropX11(const StringView& data);
 #endif
 
@@ -108,7 +108,7 @@ public:
     void StartClippingCursor(const Rectangle& bounds) override;
     void EndClippingCursor() override;
     void SetCursor(CursorType type) override;
-    void StartDragging(const Float2& offset) override;
+    void StartDragging(const Float2& offset, Window* dragSourceWindow) override;
     void StopDragging() override;
 
 #if USE_EDITOR && PLATFORM_WINDOWS

Source/Engine/UI/GUI/ContainerControl.cs

@@ -424,7 +424,7 @@ namespace FlaxEngine.GUI
             if (!IsDisposing)
             {
                 // Arrange child controls
-                //PerformLayout();
+                PerformLayout();
             }
         }
 
@@ -454,7 +454,7 @@ namespace FlaxEngine.GUI
             // Add child
             _children.Add(child);
 
-            //OnChildrenChanged();
+            OnChildrenChanged();
         }
 
         /// <summary>
@@ -468,7 +468,7 @@ namespace FlaxEngine.GUI
             // Remove child
             _children.Remove(child);
 
-           // OnChildrenChanged();
+            OnChildrenChanged();
         }
 
         /// <summary>
@@ -679,11 +679,11 @@ namespace FlaxEngine.GUI
                 _containsFocus = result;
                 if (result)
                 {
-                    //OnStartContainsFocus();
+                    OnStartContainsFocus();
                 }
                 else
                 {
-                    //OnEndContainsFocus();
+                    OnEndContainsFocus();
                 }
             }
         }
@@ -1337,7 +1337,7 @@ namespace FlaxEngine.GUI
             bool wasLayoutLocked = _isLayoutLocked;
             _isLayoutLocked = true;
 
-            //base.OnSizeChanged();
+            base.OnSizeChanged();
 
             // Fire event
             for (int i = 0; i < _children.Count; i++)
@@ -1346,7 +1346,7 @@ namespace FlaxEngine.GUI
             }
 
             // Restore state
-            //_isLayoutLocked = wasLayoutLocked;
+            _isLayoutLocked = wasLayoutLocked;
 
             // Arrange child controls
             PerformLayout();

Source/Engine/UI/GUI/Control.cs

@@ -122,7 +122,7 @@ namespace FlaxEngine.GUI
                 if (_parent == value)
                     return;
 
-                //Defocus();
+                Defocus();
 
                 Float2 oldParentSize;
                 if (_parent != null)
@@ -133,20 +133,20 @@ namespace FlaxEngine.GUI
                 else
                 {
                     oldParentSize = Float2.Zero;
-                    //ClearState();
+                    ClearState();
                 }
 
                 _parent = value;
                 _parent?.AddChildInternal(this);
 
                 CacheRootHandle();
-                /*OnParentChangedInternal();
+                OnParentChangedInternal();
 
                 // Check if parent size has been changed
                 if (_parent != null && !_parent.Size.Equals(ref oldParentSize))
                 {
                     OnParentResized();
-                }*/
+                }
             }
         }
 
@@ -461,13 +461,13 @@ namespace FlaxEngine.GUI
         /// </summary>
         public virtual void ClearState()
         {
-            /*Defocus();
+            Defocus();
             if (_isMouseOver)
                 OnMouseLeave();
             if (_isDragOver)
                 OnDragLeave();
             while (_touchOvers != null && _touchOvers.Count != 0)
-                OnTouchLeave(_touchOvers[0]);*/
+                OnTouchLeave(_touchOvers[0]);
         }
 
         #region Focus
@@ -1347,8 +1347,8 @@ namespace FlaxEngine.GUI
         /// </summary>
         protected virtual void OnSizeChanged()
         {
-            //SizeChanged?.Invoke(this);
-            //_parent?.OnChildResized(this);
+            SizeChanged?.Invoke(this);
+            _parent?.OnChildResized(this);
         }
 
         /// <summary>
@@ -1422,12 +1422,12 @@ namespace FlaxEngine.GUI
         /// </summary>
         internal virtual void CacheRootHandle()
         {
-            //if (_root != null)
-            //    RemoveUpdateCallbacks(_root);
+            if (_root != null)
+                RemoveUpdateCallbacks(_root);
 
             _root = _parent?.Root;
-            //if (_root != null)
-            //    AddUpdateCallbacks(_root);
+            if (_root != null)
+                AddUpdateCallbacks(_root);
         }
 
         /// <summary>

Source/Engine/UI/GUI/RootControl.cs

@@ -150,7 +150,7 @@ namespace FlaxEngine.GUI
                 Profiler.BeginEvent("RootControl.Update");
                 for (int i = 0; i < UpdateCallbacks.Count; i++)
                 {
-                    //UpdateCallbacks[i](deltaTime);
+                    UpdateCallbacks[i](deltaTime);
                 }
             }
             finally

Source/Engine/UI/GUI/Tooltip.cs

@@ -56,7 +56,6 @@ namespace FlaxEngine.GUI
         /// <param name="targetArea">Tooltip target area of interest.</param>
         public void Show(Control target, Float2 location, Rectangle targetArea)
         {
-            return;
             if (target == null)
                 throw new ArgumentNullException();
 

Source/Engine/UI/GUI/WindowRootControl.cs

@@ -69,7 +69,7 @@ namespace FlaxEngine.GUI
         /// </summary>
         public void Show()
         {
-            //_window.Show();
+            _window.Show();
         }
 
         /// <summary>
@@ -77,7 +77,7 @@ namespace FlaxEngine.GUI
         /// </summary>
         public void Hide()
         {
-            //_window.Hide();
+            _window.Hide();
         }
 
         /// <summary>
@@ -85,7 +85,7 @@ namespace FlaxEngine.GUI
         /// </summary>
         public void Minimize()
         {
-            //_window.Minimize();
+            _window.Minimize();
         }
 
         /// <summary>
@@ -93,7 +93,7 @@ namespace FlaxEngine.GUI
         /// </summary>
         public void Maximize()
         {
-            //_window.Maximize();
+            _window.Maximize();
         }
 
         /// <summary>
@@ -101,7 +101,7 @@ namespace FlaxEngine.GUI
         /// </summary>
         public void Restore()
         {
-            //_window.Restore();
+            _window.Restore();
         }
 
         /// <summary>
@@ -119,7 +119,7 @@ namespace FlaxEngine.GUI
         /// <param name="force">True if move to the front by force, otherwise false.</param>
         public void BringToFront(bool force = false)
         {
-            //_window.BringToFront(force);
+            _window.BringToFront(force);
         }
 
         /// <summary>
@@ -127,7 +127,7 @@ namespace FlaxEngine.GUI
         /// </summary>
         public void FlashWindow()
         {
-            //_window.FlashWindow();
+            _window.FlashWindow();
         }
 
         /// <summary>
@@ -179,7 +179,7 @@ namespace FlaxEngine.GUI
 
             _trackingControl = control;
 
-            //_window.StartTrackingMouse(useMouseScreenOffset);
+            _window.StartTrackingMouse(useMouseScreenOffset);
         }
 
         /// <inheritdoc />
@@ -191,7 +191,7 @@ namespace FlaxEngine.GUI
                 _trackingControl = null;
                 control.OnEndMouseCapture();
 
-                //_window.EndTrackingMouse();
+                _window.EndTrackingMouse();
             }
         }
 
@@ -246,7 +246,7 @@ namespace FlaxEngine.GUI
         /// <inheritdoc />
         public override void Focus()
         {
-            //_window.Focus();
+            _window.Focus();
         }
 
         /// <inheritdoc />

Source/ThirdParty/SDL/SDL3/SDL.h

@@ -20,7 +20,7 @@
 */
 
 /**
- * Main include header for the SDL library, version 3.1.7
+ * Main include header for the SDL library, version 3.1.9
  *
  * It is almost always best to include just this one header instead of
  * picking out individual headers included here. There are exceptions to

Source/ThirdParty/SDL/SDL3/SDL_assert.h

@@ -127,10 +127,12 @@ extern "C" {
  */
 #define SDL_TriggerBreakpoint() TriggerABreakpointInAPlatformSpecificManner
 
-#elif defined(_MSC_VER)
+#elif defined(_MSC_VER) && _MSC_VER >= 1310
     /* Don't include intrin.h here because it contains C++ code */
     extern void __cdecl __debugbreak(void);
     #define SDL_TriggerBreakpoint() __debugbreak()
+#elif defined(_MSC_VER) && defined(_M_IX86)
+    #define SDL_TriggerBreakpoint() { _asm { int 0x03 }  }
 #elif defined(ANDROID)
     #include <assert.h>
     #define SDL_TriggerBreakpoint() assert(0)

Source/ThirdParty/SDL/SDL3/SDL_asyncio.h

@@ -213,7 +213,7 @@ typedef struct SDL_AsyncIOQueue SDL_AsyncIOQueue;
  * \returns a pointer to the SDL_AsyncIO structure that is created or NULL on
  *          failure; call SDL_GetError() for more information.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CloseAsyncIO
  * \sa SDL_ReadAsyncIO
@@ -234,7 +234,7 @@ extern SDL_DECLSPEC SDL_AsyncIO * SDLCALL SDL_AsyncIOFromFile(const char *file,
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  */
 extern SDL_DECLSPEC Sint64 SDLCALL SDL_GetAsyncIOSize(SDL_AsyncIO *asyncio);
 
@@ -269,7 +269,7 @@ extern SDL_DECLSPEC Sint64 SDLCALL SDL_GetAsyncIOSize(SDL_AsyncIO *asyncio);
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_WriteAsyncIO
  * \sa SDL_CreateAsyncIOQueue
@@ -306,7 +306,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_ReadAsyncIO(SDL_AsyncIO *asyncio, void *ptr
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_ReadAsyncIO
  * \sa SDL_CreateAsyncIOQueue
@@ -358,7 +358,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_WriteAsyncIO(SDL_AsyncIO *asyncio, void *pt
  * \threadsafety It is safe to call this function from any thread, but two
  *               threads should not attempt to close the same object.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  */
 extern SDL_DECLSPEC bool SDLCALL SDL_CloseAsyncIO(SDL_AsyncIO *asyncio, bool flush, SDL_AsyncIOQueue *queue, void *userdata);
 
@@ -373,7 +373,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_CloseAsyncIO(SDL_AsyncIO *asyncio, bool flu
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_DestroyAsyncIOQueue
  * \sa SDL_GetAsyncIOResult
@@ -407,7 +407,7 @@ extern SDL_DECLSPEC SDL_AsyncIOQueue * SDLCALL SDL_CreateAsyncIOQueue(void);
  *               no other thread is waiting on the queue with
  *               SDL_WaitAsyncIOResult.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  */
 extern SDL_DECLSPEC void SDLCALL SDL_DestroyAsyncIOQueue(SDL_AsyncIOQueue *queue);
 
@@ -431,7 +431,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_DestroyAsyncIOQueue(SDL_AsyncIOQueue *queue
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_WaitAsyncIOResult
  */
@@ -475,7 +475,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_GetAsyncIOResult(SDL_AsyncIOQueue *queue, S
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_SignalAsyncIOQueue
  */
@@ -499,7 +499,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_WaitAsyncIOResult(SDL_AsyncIOQueue *queue,
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_WaitAsyncIOResult
  */
@@ -531,7 +531,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_SignalAsyncIOQueue(SDL_AsyncIOQueue *queue)
  * \returns true on success or false on failure; call SDL_GetError() for more
  *          information.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_LoadFile_IO
  */

Source/ThirdParty/SDL/SDL3/SDL_audio.h

@@ -745,7 +745,7 @@ extern SDL_DECLSPEC SDL_AudioDeviceID SDLCALL SDL_OpenAudioDevice(SDL_AudioDevic
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  */
 extern SDL_DECLSPEC bool SDLCALL SDL_IsAudioDevicePhysical(SDL_AudioDeviceID devid);
 
@@ -759,7 +759,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_IsAudioDevicePhysical(SDL_AudioDeviceID dev
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  */
 extern SDL_DECLSPEC bool SDLCALL SDL_IsAudioDevicePlayback(SDL_AudioDeviceID devid);
 
@@ -1577,6 +1577,26 @@ extern SDL_DECLSPEC bool SDLCALL SDL_PauseAudioStreamDevice(SDL_AudioStream *str
  */
 extern SDL_DECLSPEC bool SDLCALL SDL_ResumeAudioStreamDevice(SDL_AudioStream *stream);
 
+/**
+ * Use this function to query if an audio device associated with a stream is
+ * paused.
+ *
+ * Unlike in SDL2, audio devices start in an _unpaused_ state, since an app
+ * has to bind a stream before any audio will flow.
+ *
+ * \param stream the audio stream associated with the audio device to query.
+ * \returns true if device is valid and paused, false otherwise.
+ *
+ * \threadsafety It is safe to call this function from any thread.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_PauseAudioStreamDevice
+ * \sa SDL_ResumeAudioStreamDevice
+ */
+extern SDL_DECLSPEC bool SDLCALL SDL_AudioStreamDevicePaused(SDL_AudioStream *stream);
+
+
 /**
  * Lock an audio stream for serialized access.
  *

Source/ThirdParty/SDL/SDL3/SDL_bits.h

@@ -78,7 +78,7 @@ SDL_FORCE_INLINE int SDL_MostSignificantBitIndex32(Uint32 x)
         return -1;
     }
     return _SDL_bsr_watcom(x);
-#elif defined(_MSC_VER)
+#elif defined(_MSC_VER) && _MSC_VER >= 1400
     unsigned long index;
     if (_BitScanReverse(&index, x)) {
         return (int)index;

Source/ThirdParty/SDL/SDL3/SDL_dialog.h

@@ -312,7 +312,7 @@ typedef enum SDL_FileDialogType
  *               callback may be invoked from the same thread or from a
  *               different one, depending on the OS's constraints.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_FileDialogType
  * \sa SDL_DialogFileCallback

Source/ThirdParty/SDL/SDL3/SDL_filesystem.h

@@ -484,7 +484,7 @@ extern SDL_DECLSPEC char ** SDLCALL SDL_GlobDirectory(const char *path, const ch
  *          platform-dependent notation. NULL if there's a problem. This
  *          should be freed with SDL_free() when it is no longer needed.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  */
 extern SDL_DECLSPEC char * SDLCALL SDL_GetCurrentDirectory(void);
 

Source/ThirdParty/SDL/SDL3/SDL_gpu.h

@@ -2118,7 +2118,7 @@ extern SDL_DECLSPEC SDL_GPUDevice *SDLCALL SDL_CreateGPUDevice(
  *   provide SPIR-V shaders if applicable.
  * - `SDL_PROP_GPU_DEVICE_CREATE_SHADERS_DXBC_BOOLEAN`: The app is able to
  *   provide DXBC shaders if applicable
- *   `SDL_PROP_GPU_DEVICE_CREATE_SHADERS_DXIL_BOOLEAN`: The app is able to
+ * - `SDL_PROP_GPU_DEVICE_CREATE_SHADERS_DXIL_BOOLEAN`: The app is able to
  *   provide DXIL shaders if applicable.
  * - `SDL_PROP_GPU_DEVICE_CREATE_SHADERS_MSL_BOOLEAN`: The app is able to
  *   provide MSL shaders if applicable.
@@ -3664,7 +3664,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_SetGPUSwapchainParameters(
  * \returns true if successful, false on error; call SDL_GetError() for more
  *          information.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  */
 extern SDL_DECLSPEC bool SDLCALL SDL_SetGPUAllowedFramesInFlight(
     SDL_GPUDevice *device,
@@ -3749,7 +3749,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_AcquireGPUSwapchainTexture(
  * \threadsafety This function should only be called from the thread that
  *               created the window.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_AcquireGPUSwapchainTexture
  * \sa SDL_WaitAndAcquireGPUSwapchainTexture
@@ -3792,7 +3792,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_WaitForGPUSwapchain(
  * \threadsafety This function should only be called from the thread that
  *               created the window.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_SubmitGPUCommandBuffer
  * \sa SDL_SubmitGPUCommandBufferAndAcquireFence

Source/ThirdParty/SDL/SDL3/SDL_init.h

@@ -313,7 +313,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_Quit(void);
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_RunOnMainThread
  */
@@ -350,7 +350,7 @@ typedef void (SDLCALL *SDL_MainThreadCallback)(void *userdata);
  *
  * \threadsafety It is safe to call this function from any thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_IsMainThread
  */

Source/ThirdParty/SDL/SDL3/SDL_iostream.h

@@ -703,7 +703,7 @@ extern SDL_DECLSPEC void * SDLCALL SDL_LoadFile(const char *file, size_t *datasi
  * \returns true on success or false on failure; call SDL_GetError() for more
  *          information.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_SaveFile
  * \sa SDL_LoadFile_IO
@@ -713,14 +713,14 @@ extern SDL_DECLSPEC bool SDLCALL SDL_SaveFile_IO(SDL_IOStream *src, const void *
 /**
  * Save all the data into a file path.
  *
- * \param file the path to read all available data from.
+ * \param file the path to write all available data into.
  * \param data the data to be written. If datasize is 0, may be NULL or a
  *             invalid pointer.
  * \param datasize the number of bytes to be written.
  * \returns true on success or false on failure; call SDL_GetError() for more
  *          information.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_SaveFile_IO
  * \sa SDL_LoadFile

Source/ThirdParty/SDL/SDL3/SDL_keycode.h

@@ -47,11 +47,15 @@
  * A special exception is the number keys at the top of the keyboard which map
  * to SDLK_0...SDLK_9 on AZERTY layouts.
  *
+ * Keys with the `SDLK_EXTENDED_MASK` bit set do not map to a scancode or
+ * unicode code point.
+ *
  * \since This datatype is available since SDL 3.1.3.
  */
 typedef Uint32 SDL_Keycode;
 
-#define SDLK_SCANCODE_MASK          (1u<<30)
+#define SDLK_EXTENDED_MASK          (1u << 29)
+#define SDLK_SCANCODE_MASK          (1u << 30)
 #define SDL_SCANCODE_TO_KEYCODE(X)  (X | SDLK_SCANCODE_MASK)
 #define SDLK_UNKNOWN                0x00000000u /**< 0 */
 #define SDLK_RETURN                 0x0000000du /**< '\r' */
@@ -302,6 +306,13 @@ typedef Uint32 SDL_Keycode;
 #define SDLK_SOFTRIGHT              0x40000120u /**< SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_SOFTRIGHT) */
 #define SDLK_CALL                   0x40000121u /**< SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_CALL) */
 #define SDLK_ENDCALL                0x40000122u /**< SDL_SCANCODE_TO_KEYCODE(SDL_SCANCODE_ENDCALL) */
+#define SDLK_LEFT_TAB               0x20000001u /**< Extended key Left Tab */
+#define SDLK_LEVEL5_SHIFT           0x20000002u /**< Extended key Level 5 Shift */
+#define SDLK_MULTI_KEY_COMPOSE      0x20000003u /**< Extended key Multi-key Compose */
+#define SDLK_LMETA                  0x20000004u /**< Extended key Left Meta */
+#define SDLK_RMETA                  0x20000005u /**< Extended key Right Meta */
+#define SDLK_LHYPER                 0x20000006u /**< Extended key Left Hyper */
+#define SDLK_RHYPER                 0x20000007u /**< Extended key Right Hyper */
 
 /**
  * Valid key modifiers (possibly OR'd together).
@@ -313,6 +324,7 @@ typedef Uint16 SDL_Keymod;
 #define SDL_KMOD_NONE   0x0000u /**< no modifier is applicable. */
 #define SDL_KMOD_LSHIFT 0x0001u /**< the left Shift key is down. */
 #define SDL_KMOD_RSHIFT 0x0002u /**< the right Shift key is down. */
+#define SDL_KMOD_LEVEL5 0x0004u /**< the Level 5 Shift key is down. */
 #define SDL_KMOD_LCTRL  0x0040u /**< the left Ctrl (Control) key is down. */
 #define SDL_KMOD_RCTRL  0x0080u /**< the right Ctrl (Control) key is down. */
 #define SDL_KMOD_LALT   0x0100u /**< the left Alt key is down. */

Source/ThirdParty/SDL/SDL3/SDL_platform_defines.h

@@ -366,7 +366,7 @@
  */
 #define SDL_WINAPI_FAMILY_PHONE (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
 
-#elif HAVE_WINAPIFAMILY_H && HAVE_WINAPIFAMILY_H
+#elif defined(HAVE_WINAPIFAMILY_H) && HAVE_WINAPIFAMILY_H
     #define SDL_WINAPI_FAMILY_PHONE (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
 #else
     #define SDL_WINAPI_FAMILY_PHONE 0

Source/ThirdParty/SDL/SDL3/SDL_render.h

@@ -2110,7 +2110,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_RenderTextureRotated(SDL_Renderer *renderer
  *
  * \threadsafety You may only call this function from the main thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_RenderTexture
  */
@@ -2568,7 +2568,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_RenderDebugText(SDL_Renderer *renderer, flo
  *
  * \threadsafety This function should only be called on the main thread.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_RenderDebugText
  * \sa SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE

Source/ThirdParty/SDL/SDL3/SDL_revision.h

@@ -31,9 +31,9 @@
 /* #undef SDL_VENDOR_INFO */
 
 #ifdef SDL_VENDOR_INFO
-#define SDL_REVISION "SDL3-3.1.7-preview-3.1.6-637-g8ec576ddab (" SDL_VENDOR_INFO ")"
+#define SDL_REVISION "SDL3-3.1.9-preview-3.1.8-43-g82125ec1d (" SDL_VENDOR_INFO ")"
 #else
-#define SDL_REVISION "SDL3-3.1.7-preview-3.1.6-637-g8ec576ddab"
+#define SDL_REVISION "SDL3-3.1.9-preview-3.1.8-43-g82125ec1d"
 #endif
 
 #endif /* SDL_revision_h_ */

Source/ThirdParty/SDL/SDL3/SDL_stdinc.h

@@ -107,6 +107,32 @@ void *alloca(size_t);
 # endif
 #endif
 
+
+#ifdef SDL_WIKI_DOCUMENTATION_SECTION
+
+/**
+ * Don't let SDL use "long long" C types.
+ *
+ * SDL will define this if it believes the compiler doesn't understand the
+ * "long long" syntax for C datatypes. This can happen on older compilers.
+ *
+ * If _your_ compiler doesn't support "long long" but SDL doesn't know it, it
+ * is safe to define this yourself to build against the SDL headers.
+ *
+ * If this is defined, it will remove access to some C runtime support
+ * functions, like SDL_ulltoa and SDL_strtoll that refer to this datatype
+ * explicitly. The rest of SDL will still be available.
+ *
+ * SDL's own source code cannot be built with a compiler that has this
+ * defined, for various technical reasons.
+ */
+#define SDL_NOLONGLONG 1
+
+#elif defined(_MSC_VER) && (_MSC_VER < 1310)  /* long long introduced in Visual Studio.NET 2003 */
+#  define SDL_NOLONGLONG 1
+#endif
+
+
 #ifdef SDL_WIKI_DOCUMENTATION_SECTION
 
 /**
@@ -753,7 +779,9 @@ typedef Sint64 SDL_Time;
 #endif
 /* Specifically for the `long long` -- SDL-specific. */
 #ifdef SDL_PLATFORM_WINDOWS
+#ifndef SDL_NOLONGLONG
 SDL_COMPILE_TIME_ASSERT(longlong_size64, sizeof(long long) == 8); /* using I64 for windows - make sure `long long` is 64 bits. */
+#endif
 #define SDL_PRILL_PREFIX "I64"
 #else
 #define SDL_PRILL_PREFIX "ll"
@@ -1126,8 +1154,10 @@ SDL_COMPILE_TIME_ASSERT(uint32_size, sizeof(Uint32) == 4);
 SDL_COMPILE_TIME_ASSERT(sint32_size, sizeof(Sint32) == 4);
 SDL_COMPILE_TIME_ASSERT(uint64_size, sizeof(Uint64) == 8);
 SDL_COMPILE_TIME_ASSERT(sint64_size, sizeof(Sint64) == 8);
+#ifndef SDL_NOLONGLONG
 SDL_COMPILE_TIME_ASSERT(uint64_longlong, sizeof(Uint64) <= sizeof(unsigned long long));
 SDL_COMPILE_TIME_ASSERT(size_t_longlong, sizeof(size_t) <= sizeof(unsigned long long));
+#endif
 typedef struct SDL_alignment_test
 {
     Uint8 a;
@@ -3492,6 +3522,8 @@ extern SDL_DECLSPEC char * SDLCALL SDL_ltoa(long value, char *str, int radix);
  */
 extern SDL_DECLSPEC char * SDLCALL SDL_ultoa(unsigned long value, char *str, int radix);
 
+#ifndef SDL_NOLONGLONG
+
 /**
  * Convert a long long integer into a string.
  *
@@ -3547,6 +3579,7 @@ extern SDL_DECLSPEC char * SDLCALL SDL_lltoa(long long value, char *str, int rad
  * \sa SDL_ultoa
  */
 extern SDL_DECLSPEC char * SDLCALL SDL_ulltoa(unsigned long long value, char *str, int radix);
+#endif
 
 /**
  * Parse an `int` from a string.
@@ -3660,6 +3693,8 @@ extern SDL_DECLSPEC long SDLCALL SDL_strtol(const char *str, char **endp, int ba
  */
 extern SDL_DECLSPEC unsigned long SDLCALL SDL_strtoul(const char *str, char **endp, int base);
 
+#ifndef SDL_NOLONGLONG
+
 /**
  * Parse a `long long` from a string.
  *
@@ -3726,6 +3761,7 @@ extern SDL_DECLSPEC long long SDLCALL SDL_strtoll(const char *str, char **endp,
  * \sa SDL_ulltoa
  */
 extern SDL_DECLSPEC unsigned long long SDLCALL SDL_strtoull(const char *str, char **endp, int base);
+#endif
 
 /**
  * Parse a `double` from a string.

Source/ThirdParty/SDL/SDL3/SDL_storage.h

@@ -47,7 +47,7 @@
  *
  * Consider the following example:
  *
- * ```
+ * ```c
  * void ReadGameData(void)
  * {
  *     extern char** fileNames;
@@ -115,7 +115,7 @@
  * When using, SDL_Storage, these types of problems are virtually impossible
  * to trip over:
  *
- * ```
+ * ```c
  * void ReadGameData(void)
  * {
  *     extern char** fileNames;

Source/ThirdParty/SDL/SDL3/SDL_thread.h

@@ -446,7 +446,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_WaitThread(SDL_Thread *thread, int *status)
  * \returns the current state of a thread, or SDL_THREAD_UNKNOWN if the thread
  *          isn't valid.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_ThreadState
  */

Source/ThirdParty/SDL/SDL3/SDL_tray.h

@@ -106,7 +106,7 @@ typedef void (SDLCALL *SDL_TrayCallback)(void *userdata, SDL_TrayEntry *entry);
  *                UTF-8 encoding. Not supported on all platforms. May be NULL.
  * \returns The newly created system tray icon.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CreateTrayMenu
  * \sa SDL_GetTrayMenu
@@ -120,7 +120,7 @@ extern SDL_DECLSPEC SDL_Tray *SDLCALL SDL_CreateTray(SDL_Surface *icon, const ch
  * \param tray the tray icon to be updated.
  * \param icon the new icon. May be NULL.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CreateTray
  */
@@ -132,7 +132,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_SetTrayIcon(SDL_Tray *tray, SDL_Surface *ic
  * \param tray the tray icon to be updated.
  * \param tooltip the new tooltip in UTF-8 encoding. May be NULL.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CreateTray
  */
@@ -151,7 +151,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_SetTrayTooltip(SDL_Tray *tray, const char *
  * \param tray the tray to bind the menu to.
  * \returns the newly created menu.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CreateTray
  * \sa SDL_GetTrayMenu
@@ -172,7 +172,7 @@ extern SDL_DECLSPEC SDL_TrayMenu *SDLCALL SDL_CreateTrayMenu(SDL_Tray *tray);
  * \param entry the tray entry to bind the menu to.
  * \returns the newly created menu.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_InsertTrayEntryAt
  * \sa SDL_GetTraySubmenu
@@ -194,7 +194,7 @@ extern SDL_DECLSPEC SDL_TrayMenu *SDLCALL SDL_CreateTraySubmenu(SDL_TrayEntry *e
  * \param tray the tray entry to bind the menu to.
  * \returns the newly created menu.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CreateTray
  * \sa SDL_CreateTrayMenu
@@ -215,7 +215,7 @@ extern SDL_DECLSPEC SDL_TrayMenu *SDLCALL SDL_GetTrayMenu(SDL_Tray *tray);
  * \param entry the tray entry to bind the menu to.
  * \returns the newly created menu.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_InsertTrayEntryAt
  * \sa SDL_CreateTraySubmenu
@@ -232,7 +232,7 @@ extern SDL_DECLSPEC SDL_TrayMenu *SDLCALL SDL_GetTraySubmenu(SDL_TrayEntry *entr
  *          pointer becomes invalid when any function that inserts or deletes
  *          entries in the menu is called.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_RemoveTrayEntry
  * \sa SDL_InsertTrayEntryAt
@@ -244,7 +244,7 @@ extern SDL_DECLSPEC const SDL_TrayEntry **SDLCALL SDL_GetTrayEntries(SDL_TrayMen
  *
  * \param entry The entry to be deleted.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_GetTrayEntries
  * \sa SDL_InsertTrayEntryAt
@@ -267,7 +267,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_RemoveTrayEntry(SDL_TrayEntry *entry);
  * \param flags a combination of flags, some of which are mandatory.
  * \returns the newly created entry, or NULL if pos is out of bounds.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_TrayEntryFlags
  * \sa SDL_GetTrayEntries
@@ -287,7 +287,7 @@ extern SDL_DECLSPEC SDL_TrayEntry *SDLCALL SDL_InsertTrayEntryAt(SDL_TrayMenu *m
  * \param entry the entry to be updated.
  * \param label the new label for the entry in UTF-8 encoding.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_GetTrayEntries
  * \sa SDL_InsertTrayEntryAt
@@ -303,7 +303,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_SetTrayEntryLabel(SDL_TrayEntry *entry, con
  * \param entry the entry to be read.
  * \returns the label of the entry in UTF-8 encoding.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_GetTrayEntries
  * \sa SDL_InsertTrayEntryAt
@@ -320,7 +320,7 @@ extern SDL_DECLSPEC const char *SDLCALL SDL_GetTrayEntryLabel(SDL_TrayEntry *ent
  * \param checked SDL_TRUE if the entry should be checked; SDL_FALSE
  *                otherwise.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_GetTrayEntries
  * \sa SDL_InsertTrayEntryAt
@@ -336,7 +336,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_SetTrayEntryChecked(SDL_TrayEntry *entry, b
  * \param entry the entry to be read.
  * \returns SDL_TRUE if the entry is checked; SDL_FALSE otherwise.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_GetTrayEntries
  * \sa SDL_InsertTrayEntryAt
@@ -351,7 +351,7 @@ extern SDL_DECLSPEC bool SDLCALL SDL_GetTrayEntryChecked(SDL_TrayEntry *entry);
  * \param enabled SDL_TRUE if the entry should be enabled; SDL_FALSE
  *                otherwise.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_GetTrayEntries
  * \sa SDL_InsertTrayEntryAt
@@ -365,7 +365,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_SetTrayEntryEnabled(SDL_TrayEntry *entry, b
  * \param entry the entry to be read.
  * \returns SDL_TRUE if the entry is enabled; SDL_FALSE otherwise.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_GetTrayEntries
  * \sa SDL_InsertTrayEntryAt
@@ -381,13 +381,22 @@ extern SDL_DECLSPEC bool SDLCALL SDL_GetTrayEntryEnabled(SDL_TrayEntry *entry);
  * \param userdata an optional pointer to pass extra data to the callback when
  *                 it will be invoked.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_GetTrayEntries
  * \sa SDL_InsertTrayEntryAt
  */
 extern SDL_DECLSPEC void SDLCALL SDL_SetTrayEntryCallback(SDL_TrayEntry *entry, SDL_TrayCallback callback, void *userdata);
 
+/**
+ * Simulate a click on a tray entry.
+ *
+ * \param entry The entry to activate.
+ *
+ * \since This function is available since SDL 3.2.0.
+ */
+extern SDL_DECLSPEC void SDLCALL SDL_ClickTrayEntry(SDL_TrayEntry *entry);
+
 /**
  * Destroys a tray object.
  *
@@ -395,7 +404,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_SetTrayEntryCallback(SDL_TrayEntry *entry,
  *
  * \param tray the tray icon to be destroyed.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CreateTray
  */
@@ -407,7 +416,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_DestroyTray(SDL_Tray *tray);
  * \param entry the entry for which to get the parent menu.
  * \returns the parent menu.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_InsertTrayEntryAt
  */
@@ -423,7 +432,7 @@ extern SDL_DECLSPEC SDL_TrayMenu *SDLCALL SDL_GetTrayEntryParent(SDL_TrayEntry *
  * \param menu the menu for which to get the parent entry.
  * \returns the parent entry, or NULL if this menu is not a submenu.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CreateTraySubmenu
  * \sa SDL_GetTrayMenuParentTray
@@ -440,7 +449,7 @@ extern SDL_DECLSPEC SDL_TrayEntry *SDLCALL SDL_GetTrayMenuParentEntry(SDL_TrayMe
  * \param menu the menu for which to get the parent enttrayry.
  * \returns the parent tray, or NULL if this menu is a submenu.
  *
- * \since This function is available since SDL 3.2.0.
+ * \since This function is available since SDL 3.1.8.
  *
  * \sa SDL_CreateTrayMenu
  * \sa SDL_GetTrayMenuParentEntry

Source/ThirdParty/SDL/SDL3/SDL_version.h

@@ -62,7 +62,7 @@ extern "C" {
  *
  * \since This macro is available since SDL 3.1.3.
  */
-#define SDL_MICRO_VERSION   7
+#define SDL_MICRO_VERSION   9
 
 /**
  * This macro turns the version numbers into a numeric value.

Source/Tools/Flax.Build/Deps/Dependencies/SDL.cs

@@ -88,8 +88,8 @@ namespace Flax.Deps.Dependencies
                 Path.Combine(root, "include", "SDL3"),
             };
 
-            //CloneGitRepoFastSince(root, "https://github.com/libsdl-org/SDL", new DateTime(2025, 01, 06));
-            //GitResetToCommit(root, "8ec576ddabdc7edfd68e7a8a3214e84e4026328d");
+            CloneGitRepoFastSince(root, "https://github.com/libsdl-org/SDL", new DateTime(2025, 01, 10));
+            GitResetToCommit(root, "82125ec1d888e95f838b3cd683dfc8aa54013371");
 
             foreach (var platform in options.Platforms)
             {