feat: basic sdl3 basic windowing

Platforms/Desktop/Engine.Integration.SDL3/Windowing/IWindow.cs

@@ -0,0 +1,72 @@
+using Engine.Core;
+
+namespace Engine.Integration.SDL3;
+
+public interface IWindow : IBehaviour
+{
+    Event<IWindow, StateChangedArguments> OnStateChanged { get; }
+    Event<IWindow, FocusStateChangedArguments> OnFocusStateChanged { get; }
+    Event<IWindow, ModeChangedArguments> OnModeChanged { get; }
+    Event<IWindow, ShowStateChangedArguments> OnShowStateChanged { get; }
+    Event<IWindow, ResizeModeChangedArguments> OnResizeModeChanged { get; }
+
+    Event<IWindow, TitleChangedArguments> OnTitleChanged { get; }
+    Event<IWindow, TargetFpsChangedArguments> OnTargetFpsChanged { get; }
+    Event<IWindow, SizeChangedArguments> OnSizeChanged { get; }
+    Event<IWindow, BackgroundColorChangedArguments> OnBackgroundColorChanged { get; }
+
+    WindowState State { get; set; }
+    WindowFocusState FocusState { get; }
+    WindowMode Mode { get; set; }
+    WindowShowState ShowState { get; set; }
+    WindowResizeMode ResizeMode { get; set; }
+
+    string Title { get; set; }
+    uint TargetFps { get; set; }
+    Vector2DInt Size { get; set; }
+    ColorRGB BackgroundColor { get; set; }
+
+    readonly record struct StateChangedArguments(WindowState PreviousState);
+    readonly record struct FocusStateChangedArguments(WindowFocusState PreviousFocusState);
+    readonly record struct ModeChangedArguments(WindowMode PreviousMode);
+    readonly record struct ShowStateChangedArguments(WindowShowState PreviousShowState);
+    readonly record struct ResizeModeChangedArguments(WindowResizeMode PreviousResizeMode);
+    readonly record struct TitleChangedArguments(string PreviousTitle);
+    readonly record struct TargetFpsChangedArguments(uint PreviousTargetFps);
+    readonly record struct SizeChangedArguments(Vector2DInt PreviousSize);
+    readonly record struct BackgroundColorChangedArguments(ColorRGB PreviousColor);
+}
+
+public enum WindowFocusState
+{
+    Focused,
+    Unfocused
+}
+
+public enum WindowState
+{
+    Open,
+    Closed
+}
+
+public enum WindowMode
+{
+    Windowed,
+    Fullscreen,
+    BorderlessFullscreen,
+    BorderlessWindowed
+}
+
+public enum WindowShowState
+{
+    Normal,
+    Minimized,
+    Maximized
+}
+
+public enum WindowResizeMode
+{
+    Fixed,
+    Resizable,
+    AspectLocked
+}