Separate GraphicsContext from Window, prepare for windows and swap chain for multi window

GlitchyEngine/src/Renderer/GraphicsContext.bf

@@ -8,11 +8,25 @@ namespace GlitchyEngine.Renderer
 	{
 		private static GraphicsContext s_GraphicsContext;
 		public static GraphicsContext Get() => s_GraphicsContext;
+		
+		private Window _currentWindow;
 
-		public extern SwapChain SwapChain {get;}
+		private bool _immediateContext;
+
+		public Window CurrentWindow
+		{
+			get => _currentWindow;
+			set => _currentWindow = value;
+		}
 
 		protected extern void PlatformConstruct();
 
+		public this(Window currentWindow, bool immediateContext = false)
+		{
+			_currentWindow = currentWindow;
+			_immediateContext = immediateContext;
+		}
+
 		/**
 		 * The maximum number of simultaneous rendertargets supported. 
 		 */

GlitchyEngine/src/Renderer/RenderTarget.bf

@@ -17,10 +17,11 @@ namespace GlitchyEngine.Renderer
 		public uint32 SampleCount;
 		public uint32 SampleQuality;
 		public DepthStencilFormat DepthStencilFormat;
-		public bool IsSwapchainTarget;
+		/// If not null, the render target will represent the specified swap chains back buffer.
+		public SwapChain SwapChain;
 
 		public this(Format pixelFormat, uint32 width, uint32 height, uint32 arraySize = 1, uint32 mipLevels = 1,
-			DepthStencilFormat depthStencilFormat = .Unknown, CPUAccessFlags cpuAccess = .None, uint32 sampleCount = 1, uint32 sampleQuality = 0, bool isSwapchainTarget = false)
+			DepthStencilFormat depthStencilFormat = .Unknown, CPUAccessFlags cpuAccess = .None, uint32 sampleCount = 1, uint32 sampleQuality = 0, SwapChain swapChain = null)
 		{
 			PixelFormat = pixelFormat;
 			Width = width;
@@ -33,7 +34,7 @@ namespace GlitchyEngine.Renderer
 			SampleCount = sampleCount;
 			SampleQuality = sampleQuality;
 
-			IsSwapchainTarget = isSwapchainTarget;
+			SwapChain = swapChain;
 		}
 	}
 

GlitchyEngine/src/Renderer/RendererAPI.bf

@@ -28,7 +28,7 @@ namespace GlitchyEngine.Renderer
 		{
 			Debug.Profiler.ProfileRendererFunction!();
 
-			var actualRt = (renderTarget ?? GraphicsContext.Get().SwapChain.BackBuffer);
+			var actualRt = (renderTarget ?? GraphicsContext.Get().CurrentWindow.SwapChain.BackBuffer);
 
 			if(options.HasFlag(.Color))
 				Clear(actualRt, color);

GlitchyEngine/src/Renderer/SwapChain.bf

@@ -3,8 +3,9 @@ namespace GlitchyEngine.Renderer
 	public class SwapChain
 	{
 		private GraphicsContext _context;
+		private Window _window;
 
-		private bool _changed;
+		private bool _changed = true;
 
 		private uint32 _width, _height;
 
@@ -16,6 +17,8 @@ namespace GlitchyEngine.Renderer
 
 		public GraphicsContext Context => _context;
 
+		public Window Window => _window;
+
 		/**
 		 * Gets or Sets the backbuffers width.
 		 * @remarks @ApplyChanges() needs to be called in order to apply the changes.
@@ -77,6 +80,11 @@ namespace GlitchyEngine.Renderer
 
 		public RenderTarget2D BackBuffer => _backBuffer;
 
+		public this(Window window)
+		{
+			_window = window;
+		}
+
 		public extern void Init();
 
 		/**