* BindingsBase.cs:

* Graphics/BindingsBase.cs:
* Graphics/GraphicsBindingsBase.cs: Moved GraphicsBindingsBase to its
  own file.
Moved BindingsBase to root OpenTK folder (reason: BindingsBase is not
  specific to OpenTK.Graphics anymore).
Documented GetAddress methods.

Source/OpenTK/BindingsBase.cs

@@ -94,6 +94,21 @@ namespace OpenTK
             set { rebuildExtensionList = value; }
         }
 
+        /// <summary>
+        /// Retrieves an unmanaged function pointer to the specified function.
+        /// </summary>
+        /// <param name="funcname">
+        /// A <see cref="System.String"/> that defines the name of the function.
+        /// </param>
+        /// <returns>
+        /// A <see cref="IntPtr"/> that contains the address of funcname or IntPtr.Zero,
+        /// if the function is not supported by the drivers.
+        /// </returns>
+        /// <remarks>
+        /// Note: some drivers are known to return non-zero values for unsupported functions.
+        /// Typical values include 1 and 2 - inheritors are advised to check for and ignore these
+        /// values.
+        /// </remarks>
         protected abstract IntPtr GetAddress(string funcname);
 
         #endregion
@@ -202,14 +217,3 @@ namespace OpenTK
         #endregion
     }
 }
-
-namespace OpenTK.Graphics
-{
-    public class GraphicsBindingsBase : BindingsBase
-    {
-        protected override IntPtr GetAddress(string funcname)
-        {
-            return (GraphicsContext.CurrentContext as IGraphicsContextInternal).GetAddress(funcname);
-        }
-    }
-}

Source/OpenTK/Graphics/GraphicsBindingsBase.cs

@@ -0,0 +1,57 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2009 the Open Toolkit library.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Implements BindingsBase for the OpenTK.Graphics namespace (OpenGL and OpenGL|ES).
+    /// </summary>
+    public class GraphicsBindingsBase : BindingsBase
+    {
+        /// <summary>
+        /// Retrieves an unmanaged function pointer to the specified function.
+        /// </summary>
+        /// <param name="funcname">
+        /// A <see cref="System.String"/> that defines the name of the function.
+        /// </param>
+        /// <returns>
+        /// A <see cref="IntPtr"/> that contains the address of funcname or IntPtr.Zero,
+        /// if the function is not supported by the drivers.
+        /// </returns>
+        /// <remarks>
+        /// Note: some drivers are known to return non-zero values for unsupported functions.
+        /// Typical values include 1 and 2 - inheritors are advised to check for and ignore these
+        /// values.
+        /// </remarks>
+        protected override IntPtr GetAddress(string funcname)
+        {
+            return (GraphicsContext.CurrentContext as IGraphicsContextInternal).GetAddress(funcname);
+        }
+    }
+}