Basic structure for game engine and state system.

Untested.

RecrownedGTK/Game/GameEngine.cs

@@ -0,0 +1,49 @@
+using OpenTK;
+using OpenTK.Graphics.OpenGL;
+using System;
+using System.ComponentModel;
+using RecrownedGTK.Persistence;
+using RecrownedGTK.AssetsSystem;
+namespace RecrownedGTK.Game {
+    public sealed class GameEngine : GameWindow {
+        private IState state;
+        public readonly Preferences preferences;
+        public readonly AssetManager assets;
+        public GameEngine(IState initialState, Preferences preferences, AssetManager assets) : base() {
+            this.state = initialState;
+            this.assets = assets;
+            this.preferences = preferences;
+        }
+
+        protected override void OnUpdateFrame(FrameEventArgs e) {
+            state.Update(e.Time);
+            IState potentialState = null;
+            if ((potentialState = state.ChangeState()) != null) {
+                if (potentialState.Shown(this)) {
+                    state.Hidden();
+                    state = potentialState;
+                }
+            }
+            base.OnUpdateFrame(e);
+        }
+
+        protected override void OnRenderFrame(FrameEventArgs e) {
+            state.Render(e.Time);
+            SwapBuffers();
+            base.OnRenderFrame(e);
+        }
+        
+        protected override void OnClosed(EventArgs e) {
+            if (state.CloseRequested()) {
+                ((CancelEventArgs) e).Cancel = true;
+            }
+            base.OnClosed(e);
+        }
+
+        protected override void OnResize(EventArgs e) {
+            state.WindowSizeUpdate(Width, Height);
+            GL.Viewport(0, 0, Width, Height);
+            base.OnResize(e);
+        }
+    }
+}

RecrownedGTK/Game/IState.cs

@@ -0,0 +1,16 @@
+using OpenTK.Input;
+
+namespace RecrownedGTK.Game {
+    public interface IState
+    {
+        bool Shown(GameEngine gameManager);
+        void Update(double time);
+
+        void Render(double time);
+        void Hidden();
+        void WindowSizeUpdate(int width, int height);
+        bool CloseRequested();
+        IState ChangeState();
+        
+    }
+}

RecrownedGTK/GameManager.cs

@@ -1,20 +0,0 @@
-using OpenTK;
-namespace RecrownedGTK.Game {
-    public class GameManager : GameWindow {
-        public GameManager() : base() {
-            //TODO Implement interface that calls the users created game files.
-        }
-
-        protected override void OnUpdateFrame(FrameEventArgs e) {
-            base.OnUpdateFrame(e);
-        }
-
-        protected override void OnRenderFrame(FrameEventArgs e) {
-            base.OnRenderFrame(e);
-        }
-
-        protected override void OnClosed(System.EventArgs e) {
-            base.OnClosed(e);
-        }
-    }
-}