Added more OpenGL delegates, and restructured game manager.

Largely untested.

src/SlatedGameToolkit.Framework/Graphics/OpenGL/GLFunctionDelegates.cs

@@ -10,5 +10,8 @@ namespace SlatedGameToolkit.Framework.Graphics.OpenGL
     internal delegate void GLCompileShader(IntPtr shaderHandle);
     internal delegate void GLGetShaderLogInfo(IntPtr shaderHandle, int maxLength, out int writtenLength, out string output);
     internal delegate IntPtr GLCreateProgram();
+    internal delegate IntPtr GLDeleteProgram();
     internal delegate void GLAttachShader(IntPtr program, IntPtr shader);
+    internal delegate void GLDetachShader(IntPtr program, IntPtr shader);
+    internal delegate void GLDeleteShader(IntPtr shader);
 }

src/SlatedGameToolkit.Framework/StateSystem/Manager.cs

@@ -111,7 +111,7 @@ namespace SlatedGameToolkit.Framework.StateSystem
             if (states[name] == currentState) return false;
             IState state = states[name];
             GameEngine.Logger.Debug("Removing state: " + name);
-            state.Dispose();
+            state.Deinitialize();
             return states.Remove(name);
         }
 

src/SlatedGameToolkit.Framework/StateSystem/States/IState.cs

@@ -3,7 +3,7 @@ using SlatedGameToolkit.Framework.Graphics.Window;
 
 namespace SlatedGameToolkit.Framework.StateSystem.States
 {
-    public interface IState : IDisposable
+    public interface IState
     {
         WindowHandle CurrentWindow { get; }
 
@@ -55,5 +55,11 @@ namespace SlatedGameToolkit.Framework.StateSystem.States
         /// </summary>
         /// <return>A string representing the name of this state.</return>
         string getName();
+
+        /// <summary>
+        /// Called when this state is being removed from the manager, and likely not used again in this games life cycle.
+        /// Any unmanaged resources that needs to be disposed of should be done so here.
+        /// </summary>
+        void Deinitialize();
     }
 }

src/SlatedGameToolkit.Tools/Utilities/GraphicalPlayground/MainState.cs

@@ -22,7 +22,7 @@ namespace SlatedGameToolkit.Tools.Utilities.GraphicalPlayground
             return true;
         }
 
-        public void Dispose()
+        public void Deinitialize()
         {
             window.Dispose();
         }