[OpenTK] Added base IPlatformFactory implementation

PlatformFactoryBase provides a common base interface for platform
backends. Platform backends should inherit from PlatformFactoryBase in
order to reduce code duplication.

Source/OpenTK/OpenTK.csproj

@@ -799,6 +799,7 @@
     <Compile Include="Input\GamePadConfigurationSource.cs" />
     <Compile Include="Input\GamePadConfigurationItem.cs" />
     <Compile Include="Platform\LegacyJoystickDriver.cs" />
+    <Compile Include="Platform\PlatformFactoryBase.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>

Source/OpenTK/Platform/PlatformFactoryBase.cs

@@ -0,0 +1,120 @@
+#region License
+//
+// PlatformFactoryBase.cs
+//
+// Author:
+//       Stefanos A. <stapostol@gmail.com>
+//
+// Copyright (c) 2006-2014 Stefanos Apostolopoulos
+//
+// 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;
+using System.Diagnostics;
+using OpenTK.Graphics;
+using OpenTK.Input;
+
+namespace OpenTK.Platform
+{
+    /// \internal
+    /// <summary>
+    /// Implements IPlatformFactory functionality that is common
+    /// for all platform backends. IPlatformFactory implementations
+    /// should inherit from this class.
+    /// </summary>
+    abstract class PlatformFactoryBase : IPlatformFactory
+    {
+        protected bool IsDisposed;
+
+        public PlatformFactoryBase()
+        {
+        }
+
+        #region IPlatformFactory Members
+
+        public abstract INativeWindow CreateNativeWindow(int x, int y, int width, int height, string title, GraphicsMode mode, GameWindowFlags options, DisplayDevice device);
+
+        public abstract IDisplayDeviceDriver CreateDisplayDeviceDriver();
+
+        public abstract IGraphicsContext CreateGLContext(GraphicsMode mode, IWindowInfo window, IGraphicsContext shareContext, bool directRendering, int major, int minor, GraphicsContextFlags flags);
+
+        public virtual IGraphicsContext CreateGLContext(ContextHandle handle, IWindowInfo window, IGraphicsContext shareContext, bool directRendering, int major, int minor, GraphicsContextFlags flags)
+        {
+            throw new NotImplementedException();
+        }
+
+        public abstract GraphicsContext.GetCurrentContextDelegate CreateGetCurrentGraphicsContext();
+
+        public virtual IGraphicsMode CreateGraphicsMode()
+        {
+            throw new NotSupportedException();
+        }
+
+        public abstract IKeyboardDriver2 CreateKeyboardDriver();
+
+        public abstract IMouseDriver2 CreateMouseDriver();
+
+        public virtual IGamePadDriver CreateGamePadDriver()
+        {
+            return new MappedGamePadDriver();
+        }
+
+        public abstract IJoystickDriver2 CreateJoystickDriver();
+
+        public virtual IJoystickDriver CreateLegacyJoystickDriver()
+        {
+            return new LegacyJoystickDriver();
+        }
+
+        #endregion
+
+        #region IDisposable implementation
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool manual)
+        {
+            if (!IsDisposed)
+            {
+                if (manual)
+                {
+                }
+                else
+                {
+                    Debug.Print("[OpenTK] {0} leaked, did you forget to call Dispose()?", GetType());
+                }
+                IsDisposed = true;
+            }
+        }
+
+        ~PlatformFactoryBase()
+        {
+            Dispose(false);
+        }
+
+        #endregion
+    }
+}
+