diff --git a/lib/RefreshCS b/lib/RefreshCS
index eaed76f..7c31601 160000
--- a/lib/RefreshCS
+++ b/lib/RefreshCS
@@ -1 +1 @@
-Subproject commit eaed76f4dcc60022b3f10997fb34eb8ead9ae7d7
+Subproject commit 7c31601ab48ca0ccf3f475193643ca5f652bd509
diff --git a/src/Graphics/CommandBuffer.cs b/src/Graphics/CommandBuffer.cs
index ac01e28..1918940 100644
--- a/src/Graphics/CommandBuffer.cs
+++ b/src/Graphics/CommandBuffer.cs
@@ -13,15 +13,18 @@ namespace MoonWorks.Graphics
 		public IntPtr Handle { get; }
 
 		// some state for debug validation
-		GraphicsPipeline currentGraphicsPipeline = null;
-		ComputePipeline currentComputePipeline = null;
-		bool renderPassActive = false;
+		GraphicsPipeline currentGraphicsPipeline;
+		ComputePipeline currentComputePipeline;
+		bool renderPassActive;
 
 		// called from RefreshDevice
 		internal CommandBuffer(GraphicsDevice device, IntPtr handle)
 		{
 			Device = device;
 			Handle = handle;
+			currentGraphicsPipeline = null;
+			currentComputePipeline = null;
+			renderPassActive = false;
 		}
 
 		// FIXME: we can probably use the NativeMemory functions to not have to generate arrays here
@@ -815,7 +818,7 @@ namespace MoonWorks.Graphics
 			return new Texture(
 				Device,
 				texturePtr,
-				Device.GetSwapchainFormat(window),
+				window.SwapchainFormat,
 				width,
 				height
 			);
diff --git a/src/Graphics/GraphicsDevice.cs b/src/Graphics/GraphicsDevice.cs
index 8d58559..0f9fcbb 100644
--- a/src/Graphics/GraphicsDevice.cs
+++ b/src/Graphics/GraphicsDevice.cs
@@ -10,6 +10,9 @@ namespace MoonWorks.Graphics
 		public IntPtr Handle { get; }
 		public Backend Backend { get; }
 
+		private uint windowFlags;
+		public SDL2.SDL.SDL_WindowFlags WindowFlags => (SDL2.SDL.SDL_WindowFlags) windowFlags;
+
 		// Built-in video pipeline
 		private ShaderModule VideoVertexShader { get; }
 		private ShaderModule VideoFragmentShader { get; }
@@ -20,22 +23,13 @@ namespace MoonWorks.Graphics
 		private readonly List<WeakReference<GraphicsResource>> resources = new List<WeakReference<GraphicsResource>>();
 
 		public GraphicsDevice(
-			IntPtr deviceWindowHandle,
 			Backend preferredBackend,
-			Refresh.PresentMode presentMode,
 			bool debugMode
 		)
 		{
-			Backend = (Backend) Refresh.Refresh_SelectBackend((Refresh.Backend) preferredBackend, out uint flags);
-
-			var presentationParameters = new Refresh.PresentationParameters
-			{
-				deviceWindowHandle = deviceWindowHandle,
-				presentMode = presentMode
-			};
+			Backend = (Backend) Refresh.Refresh_SelectBackend((Refresh.Backend) preferredBackend, out windowFlags);
 
 			Handle = Refresh.Refresh_CreateDevice(
-				presentationParameters,
 				Conversions.BoolToByte(debugMode)
 			);
 
@@ -60,6 +54,43 @@ namespace MoonWorks.Graphics
 			);
 		}
 
+		public bool ClaimWindow(Window window, PresentMode presentMode)
+		{
+			var success = Conversions.ByteToBool(
+				Refresh.Refresh_ClaimWindow(
+					Handle,
+					window.Handle,
+					(Refresh.PresentMode) presentMode
+				)
+			);
+
+			if (success)
+			{
+				window.Claimed = true;
+				window.SwapchainFormat = GetSwapchainFormat(window);
+			}
+
+			return success;
+		}
+
+		public void UnclaimWindow(Window window)
+		{
+			Refresh.Refresh_UnclaimWindow(
+				Handle,
+				window.Handle
+			);
+			window.Claimed = false;
+		}
+
+		public void SetPresentMode(Window window, PresentMode presentMode)
+		{
+			Refresh.Refresh_SetSwapchainPresentMode(
+				Handle,
+				window.Handle,
+				(Refresh.PresentMode) presentMode
+			);
+		}
+
 		public CommandBuffer AcquireCommandBuffer()
 		{
 			return new CommandBuffer(this, Refresh.Refresh_AcquireCommandBuffer(Handle, 0));
@@ -86,7 +117,7 @@ namespace MoonWorks.Graphics
 			Refresh.Refresh_Wait(Handle);
 		}
 
-		public TextureFormat GetSwapchainFormat(Window window)
+		private TextureFormat GetSwapchainFormat(Window window)
 		{
 			return (TextureFormat) Refresh.Refresh_GetSwapchainFormat(Handle, window.Handle);
 		}
diff --git a/src/Window.cs b/src/Window.cs
index b81cb02..e1f1cdb 100644
--- a/src/Window.cs
+++ b/src/Window.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using SDL2;
 
 namespace MoonWorks
@@ -10,29 +11,32 @@ namespace MoonWorks
 		public uint Width { get; private set; }
 		public uint Height { get; private set; }
 
+		public bool Claimed { get; internal set; }
+		public MoonWorks.Graphics.TextureFormat SwapchainFormat { get; internal set; }
+
 		private bool IsDisposed;
 
-		public Window(WindowCreateInfo windowCreateInfo)
-		{
-			var windowFlags = SDL.SDL_WindowFlags.SDL_WINDOW_VULKAN;
+		private static Dictionary<uint, Window> idLookup = new Dictionary<uint, Window>();
 
+		public Window(WindowCreateInfo windowCreateInfo, SDL.SDL_WindowFlags flags)
+		{
 			if (windowCreateInfo.ScreenMode == ScreenMode.Fullscreen)
 			{
-				windowFlags |= SDL.SDL_WindowFlags.SDL_WINDOW_FULLSCREEN;
+				flags |= SDL.SDL_WindowFlags.SDL_WINDOW_FULLSCREEN;
 			}
 			else if (windowCreateInfo.ScreenMode == ScreenMode.BorderlessWindow)
 			{
-				windowFlags |= SDL.SDL_WindowFlags.SDL_WINDOW_FULLSCREEN_DESKTOP;
+				flags |= SDL.SDL_WindowFlags.SDL_WINDOW_FULLSCREEN_DESKTOP;
 			}
 
 			if (windowCreateInfo.SystemResizable)
 			{
-				windowFlags |= SDL.SDL_WindowFlags.SDL_WINDOW_RESIZABLE;
+				flags |= SDL.SDL_WindowFlags.SDL_WINDOW_RESIZABLE;
 			}
 
 			if (windowCreateInfo.StartMaximized)
 			{
-				windowFlags |= SDL.SDL_WindowFlags.SDL_WINDOW_MAXIMIZED;
+				flags |= SDL.SDL_WindowFlags.SDL_WINDOW_MAXIMIZED;
 			}
 
 			ScreenMode = windowCreateInfo.ScreenMode;
@@ -43,11 +47,13 @@ namespace MoonWorks
 				SDL.SDL_WINDOWPOS_UNDEFINED,
 				(int) windowCreateInfo.WindowWidth,
 				(int) windowCreateInfo.WindowHeight,
-				windowFlags
+				flags
 			);
 
 			Width = windowCreateInfo.WindowWidth;
 			Height = windowCreateInfo.WindowHeight;
+
+			idLookup.Add(SDL.SDL_GetWindowID(Handle), this);
 		}
 
 		public void ChangeScreenMode(ScreenMode screenMode)
@@ -81,6 +87,11 @@ namespace MoonWorks
 			Height = height;
 		}
 
+		internal static Window Lookup(uint windowID)
+		{
+			return idLookup.ContainsKey(windowID) ? idLookup[windowID] : null;
+		}
+
 		internal void SizeChanged(uint width, uint height)
 		{
 			Width = width;
@@ -96,6 +107,7 @@ namespace MoonWorks
 					// dispose managed state (managed objects)
 				}
 
+				idLookup.Remove(SDL.SDL_GetWindowID(Handle));
 				SDL.SDL_DestroyWindow(Handle);
 
 				IsDisposed = true;