rename Window to OSWindow for namespacing + add alpha timing to draw

src/Game.cs

@@ -3,6 +3,7 @@ using SDL2;
 using MoonWorks.Audio;
 using MoonWorks.Graphics;
 using MoonWorks.Input;
+using MoonWorks.Window;
 
 namespace MoonWorks
 {
@@ -16,7 +17,7 @@ namespace MoonWorks
         double accumulator = 0;
         bool debugMode;
 
-        public Window Window { get; }
+        public OSWindow Window { get; }
         public GraphicsDevice GraphicsDevice { get; }
         public AudioDevice AudioDevice { get; }
         public Inputs Inputs { get; }
@@ -47,7 +48,7 @@ namespace MoonWorks
 
             Inputs = new Inputs();
 
-            Window = new Window(windowCreateInfo);
+            Window = new OSWindow(windowCreateInfo);
 
             GraphicsDevice = new GraphicsDevice(
                 Window.Handle,
@@ -92,9 +93,11 @@ namespace MoonWorks
                         accumulator -= timestep;
                     }
 
+                    double alpha = accumulator / timestep;
+
                     if (updateThisLoop)
                     {
-                        Draw();
+                        Draw(timestep, alpha);
                     }
                 }
             }
@@ -115,6 +118,6 @@ namespace MoonWorks
 
         protected abstract void Update(double dt);
 
-        protected abstract void Draw();
+        protected abstract void Draw(double dt, double alpha);
     }
 }

src/Window/OSWindow.cs

@@ -1,14 +1,14 @@
 using System;
 using SDL2;
 
-namespace MoonWorks
+namespace MoonWorks.Window
 {
-    public class Window
+    public class OSWindow
     {
         internal IntPtr Handle { get; }
         public ScreenMode ScreenMode { get; }
 
-        public Window(WindowCreateInfo windowCreateInfo)
+        public OSWindow(WindowCreateInfo windowCreateInfo)
         {
             var windowFlags = SDL.SDL_WindowFlags.SDL_WINDOW_VULKAN;
 

src/Window/ScreenMode.cs

@@ -1,4 +1,4 @@
-namespace MoonWorks
+namespace MoonWorks.Window
 {
     public enum ScreenMode
     {

src/Window/WindowCreateInfo.cs

@@ -1,4 +1,4 @@
-namespace MoonWorks
+namespace MoonWorks.Window
 {
     public struct WindowCreateInfo
     {