add some basic object pooling support

Blarg.GameFramework/Blarg.GameFramework.csproj

@@ -137,6 +137,9 @@
     <Compile Include="Support\StringBuilderExtensions.cs" />
     <Compile Include="Graphics\Helpers\GraphicsHelpers.cs" />
     <Compile Include="Support\BitExtensions.cs" />
+    <Compile Include="Support\ObjectPool.cs" />
+    <Compile Include="Support\IPoolable.cs" />
+    <Compile Include="Support\BasicObjectPool.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
   <ItemGroup>

Blarg.GameFramework/Support/BasicObjectPool.cs

@@ -0,0 +1,23 @@
+using System;
+
+namespace Blarg.GameFramework.Support
+{
+	public class BasicObjectPool<T> : ObjectPool<T> where T : class, new()
+	{
+		public BasicObjectPool()
+			: base()
+		{
+		}
+
+		public BasicObjectPool(int initialCapacity)
+			: base(initialCapacity)
+		{
+		}
+
+		protected override T Allocate()
+		{
+			return new T();
+		}
+	}
+}
+

Blarg.GameFramework/Support/IPoolable.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace Blarg.GameFramework.Support
+{
+	public interface IPoolable
+	{
+		void Reset();
+	}
+}
+

Blarg.GameFramework/Support/ObjectPool.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+
+namespace Blarg.GameFramework.Support
+{
+	public abstract class ObjectPool<T> where T : class
+	{
+		List<T> _objects;
+		int _objectCount;
+
+		public ObjectPool()
+			: this(16)
+		{
+		}
+
+		public ObjectPool(int initialCapacity)
+		{
+			_objects = new List<T>(initialCapacity);
+			_objectCount = 0;
+		}
+
+		protected abstract T Allocate();
+
+		public T Take()
+		{
+			if (_objectCount == 0)
+				return Allocate();
+			else
+			{
+				// remove the last object in the list
+				int index = _objectCount - 1;
+				T obj = _objects[index];
+
+				// shrink the object list
+				_objects[index] = null;
+				--_objectCount;
+
+				return obj;
+			}
+		}
+
+		public void Free(T obj)
+		{
+			if (obj == null)
+				throw new ArgumentNullException("obj");
+
+			int index = _objectCount;
+			if (index >= _objects.Count)
+				// need to grow the object list by one
+				_objects.Add(obj);
+			else
+				_objects[index] = obj;
+
+			++_objectCount;
+
+			if (obj is IPoolable)
+				((IPoolable)obj).Reset();
+		}
+	}
+}
+