Added comments.

src/graphics/shared_gpu_objects.cpp

@@ -198,8 +198,11 @@ void SharedGPUObjects::init()
 }   // SharedGPUObjects
 
 // ----------------------------------------------------------------------------
-
+/** A simple reset function. Atm it actually only resets the
+ *  m_has_been_initialised flag (all opengl data gets reset anyway when this
+ *  function is called).
+ */
 void SharedGPUObjects::reset()
 {
     m_has_been_initialised = false;
-}
+}   // reset