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diff --git a/vke/src/Activable.cs b/vke/src/Activable.cs
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+//
+// Activable.cs
+//
+// Author:
+//       Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+// Copyright (c) 2019 jp
+//
+// 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.
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Vulkan;
+using static Vulkan.VulkanNative;
+
+namespace VKE {
+	public enum ActivableState { Init, Activated, Disposed };
+	public abstract class Activable : IDisposable { 
+		protected uint references;
+		protected ActivableState state;
+
+		public Device dev { get; private set; }
+
+		protected Activable (Device dev) {
+			this.dev = dev;
+		}
+
+		public virtual void Activate () {
+			if (state == ActivableState.Disposed) 
+				GC.ReRegisterForFinalize (this);
+			state = ActivableState.Activated;
+			references++;
+		}
+
+		public void Desactivate () { 
+		}
+		#region IDisposable Support
+		protected virtual void Dispose (bool disposing) {
+			state = ActivableState.Disposed;
+		}
+
+		~Activable() {
+			Dispose(false);
+		}
+		public void Dispose () {
+			if (references>0)
+				references--;
+			if (references>0)
+				return;
+			Dispose (true);
+			GC.SuppressFinalize(this);
+		}
+		#endregion
+	}
+}