Fix window dragging when not supported by Wayland compositor

Source/Editor/GUI/Docking/FloatWindowDockPanel.cs

@@ -75,7 +75,7 @@ namespace FlaxEditor.GUI.Docking
             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;

Source/Editor/GUI/MainMenu.cs

@@ -84,13 +84,15 @@ namespace FlaxEditor.GUI
 
                 ScriptsBuilder.GetBinariesConfiguration(out _, out _, out _, out var configuration);
 
+                var driver = Platform.DisplayServer;
+
                 _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),
+                    TooltipText = string.Format("{0}\nVersion {1}\nConfiguration {3}\nGraphics {2} {4}", _window.Title, Globals.EngineVersion, GPUDevice.Instance.RendererType, configuration, driver),
                     Parent = this,
                 };
 

Source/Engine/GraphicsDevice/Vulkan/GPUSwapChainVulkan.cpp

@@ -374,7 +374,9 @@ bool GPUSwapChainVulkan::CreateSwapChain(int32 width, int32 height)
     swapChainInfo.presentMode = presentMode;
     swapChainInfo.clipped = VK_TRUE;
     swapChainInfo.compositeAlpha = VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR;
-    if (surfProperties.supportedCompositeAlpha & VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR)
+    if (_window->GetSettings().SupportsTransparency && surfProperties.supportedCompositeAlpha & VK_COMPOSITE_ALPHA_PRE_MULTIPLIED_BIT_KHR)
+        swapChainInfo.compositeAlpha = VK_COMPOSITE_ALPHA_PRE_MULTIPLIED_BIT_KHR;
+    else if (surfProperties.supportedCompositeAlpha & VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR)
         swapChainInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
 
     // Create swap chain

Source/Engine/Platform/Base/PlatformBase.cpp

@@ -249,6 +249,15 @@ PlatformType PlatformBase::GetPlatformType()
     return PLATFORM_TYPE;
 }
 
+#if !PLATFORM_SDL
+
+String PlatformBase::GetDisplayServer()
+{
+    return String::Empty;
+}
+
+#endif
+
 bool PlatformBase::Is64BitApp()
 {
 #if PLATFORM_64BITS

Source/Engine/Platform/Base/PlatformBase.h

@@ -345,6 +345,11 @@ public:
     /// </summary>
     API_PROPERTY() static PlatformType GetPlatformType();
 
+    /// <summary>
+    /// Returns the display server name on Linux.
+    /// </summary>
+    API_PROPERTY() static String GetDisplayServer() = delete;
+
     /// <summary>
     /// Returns true if is running 64 bit application (otherwise 32 bit). It's compile-time constant.
     /// </summary>

Source/Engine/Platform/Linux/LinuxScreenUtilities.cpp

@@ -1,6 +1,6 @@
 // Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
 
-#if USE_EDITOR && PLATFORM_LINUX
+#if PLATFORM_LINUX
 
 #include "Engine/Platform/Types.h"
 #include "Engine/Platform/ScreenUtilities.h"

Source/Engine/Platform/Linux/LinuxScreenUtilities.h

@@ -2,7 +2,7 @@
 
 #pragma once
 
-#if USE_EDITOR && PLATFORM_LINUX
+#if PLATFORM_LINUX
 
 #include "Engine/Platform/Base/ScreenUtilitiesBase.h"
 #include "Engine/Core/Types/BaseTypes.h"

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

@@ -310,7 +310,7 @@ namespace WaylandImpl
                     LOG(Warning, "wl_display_roundtrip_queue failed, errno: {}", errno);
 
                 // Wait until window has showed up
-                if (wrappedToplevel == nullptr && dragWindow && Platform::AtomicRead(&WaitFlag) != 0)
+                if (DragManager != nullptr && wrappedToplevel == nullptr && dragWindow && Platform::AtomicRead(&WaitFlag) != 0)
                 {
                     auto toplevel = static_cast<xdg_toplevel*>(SDL_GetPointerProperty(SDL_GetWindowProperties(draggedWindow), SDL_PROP_WINDOW_WAYLAND_XDG_TOPLEVEL_POINTER, nullptr));
                     if (toplevel != nullptr)
@@ -1431,7 +1431,11 @@ DragDropEffect SDLWindow::DoDragDrop(const StringView& data, const Float2& offse
             else
                 SDL_ShowWindow(_window);
         }
-        WindowBase::Show();
+        // Only show the window if toplevel dragging is supported
+        if (WaylandImpl::DragManager != nullptr)
+            WindowBase::Show();
+        else
+            Hide();
         
         WaylandImpl::DraggingWindow = true;
         DoDragDropWayland(String(""), dragSourceWindow, dragOffset);

Source/Engine/Platform/SDL/SDLPlatform.cpp

@@ -166,6 +166,18 @@ bool SDLPlatform::HandleEvent(SDL_Event& event)
     return true;
 }
 
+String SDLPlatform::GetDisplayServer()
+{
+#if PLATFORM_LINUX
+    String driver(SDL_GetCurrentVideoDriver());
+    if (driver.Length() > 0)
+        driver[0] = StringUtils::ToUpper(driver[0]);
+    return driver;
+#else
+    return String::Empty;
+#endif
+}
+
 BatteryInfo SDLPlatform::GetBatteryInfo()
 {
     BatteryInfo info;

Source/Engine/Platform/SDL/SDLPlatform.h

@@ -63,6 +63,7 @@ public:
     static bool Init();
     static void LogInfo();
     static void Tick();
+    static String GetDisplayServer();
     static void SetHighDpiAwarenessEnabled(bool enable);
     static BatteryInfo GetBatteryInfo();
     static int32 GetDpi();

Source/Engine/Platform/Windows/WindowsScreenUtilities.cpp

@@ -1,6 +1,6 @@
 // Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
 
-#if USE_EDITOR && PLATFORM_WINDOWS
+#if PLATFORM_WINDOWS
 
 #include "Engine/Platform/Types.h"
 #include "Engine/Platform/ScreenUtilities.h"

Source/Engine/Platform/Windows/WindowsScreenUtilities.h

@@ -2,7 +2,7 @@
 
 #pragma once
 
-#if USE_EDITOR && PLATFORM_WINDOWS
+#if PLATFORM_WINDOWS
 
 #include "Engine/Platform/Base/ScreenUtilitiesBase.h"
 #include "Engine/Core/Types/BaseTypes.h"