Added new RHI abstraction layer;

Added new console debug page to UnitTest;

Ghost.Graphics/RHI/ISwapChain.cs

@@ -0,0 +1,133 @@
+using Ghost.Graphics.Contracts;
+
+namespace Ghost.Graphics.RHI;
+
+/// <summary>
+/// Swap chain interface for presentation
+/// </summary>
+public interface ISwapChain : IDisposable
+{
+    /// <summary>
+    /// Width of the swap chain back buffers
+    /// </summary>
+    uint Width { get; }
+
+    /// <summary>
+    /// Height of the swap chain back buffers
+    /// </summary>
+    uint Height { get; }
+
+    /// <summary>
+    /// Number of back buffers
+    /// </summary>
+    uint BufferCount { get; }
+
+    /// <summary>
+    /// Gets the current back buffer texture
+    /// </summary>
+    /// <returns>Current back buffer texture</returns>
+    ITexture GetCurrentBackBuffer();
+
+    /// <summary>
+    /// Presents the rendered frame
+    /// </summary>
+    /// <param name="vsync">Enable vertical synchronization</param>
+    void Present(bool vsync = true);
+
+    /// <summary>
+    /// Resizes the swap chain back buffers
+    /// </summary>
+    /// <param name="width">New width</param>
+    /// <param name="height">New height</param>
+    void Resize(uint width, uint height);
+}
+
+/// <summary>
+/// Swap chain description
+/// </summary>
+public struct SwapChainDesc
+{
+    /// <summary>
+    /// Width of the swap chain
+    /// </summary>
+    public uint Width;
+
+    /// <summary>
+    /// Height of the swap chain
+    /// </summary>
+    public uint Height;
+
+    /// <summary>
+    /// Back buffer format
+    /// </summary>
+    public TextureFormat Format;
+
+    /// <summary>
+    /// Number of back buffers
+    /// </summary>
+    public uint BufferCount;
+
+    /// <summary>
+    /// Target for presentation (window handle or composition target)
+    /// </summary>
+    public SwapChainTarget Target;
+
+    public SwapChainDesc(uint width, uint height, SwapChainTarget target, TextureFormat format = TextureFormat.B8G8R8A8_UNorm, uint bufferCount = 2)
+    {
+        Width = width;
+        Height = height;
+        Format = format;
+        BufferCount = bufferCount;
+        Target = target;
+    }
+}
+
+/// <summary>
+/// Swap chain target (window handle or composition surface)
+/// </summary>
+public struct SwapChainTarget
+{
+    /// <summary>
+    /// Target type
+    /// </summary>
+    public SwapChainTargetType Type;
+
+    /// <summary>
+    /// Window handle for HWND targets
+    /// </summary>
+    public nint WindowHandle;
+
+    /// <summary>
+    /// Composition surface for UWP/WinUI targets
+    /// </summary>
+    public object? CompositionSurface;
+
+    public static SwapChainTarget FromWindowHandle(nint hwnd)
+    {
+        return new SwapChainTarget
+        {
+            Type = SwapChainTargetType.WindowHandle,
+            WindowHandle = hwnd,
+            CompositionSurface = null
+        };
+    }
+
+    public static SwapChainTarget FromCompositionSurface(object surface)
+    {
+        return new SwapChainTarget
+        {
+            Type = SwapChainTargetType.Composition,
+            WindowHandle = nint.Zero,
+            CompositionSurface = surface
+        };
+    }
+}
+
+/// <summary>
+/// Swap chain target types
+/// </summary>
+public enum SwapChainTargetType
+{
+    WindowHandle,
+    Composition
+}