--- /dev/null
+#ifndef MSP_GL_RESOURCEOBSERVER_H_
+#define MSP_GL_RESOURCEOBSERVER_H_
+
+namespace Msp {
+namespace GL {
+
+class Resource;
+
+class ResourceObserver
+{
+protected:
+ ResourceObserver() { }
+public:
+ virtual ~ResourceObserver() { }
+
+ virtual void resource_loaded(Resource &) { }
+ virtual void resource_unloaded(Resource &) { }
+ virtual void resource_removed(Resource &) { }
+};
+
+} // namespace GL
+} // namespace Msp
+
+#endif