Reduce number of full updates sent on region crossing for attachments/huds to 1 from 3

This is one step towards reducing hud glitches on region crossing, since the viewer fails to display prims if it receives child full updates before the root prim full update
This commit also introduces a mechanism in LLClientView to stop child attachment updates ever going out before the root one
This is a very temporary mechanism and will be commented out when the next step of the fix (to give root prims higher udpate priority) is committed
This code is a foreport from the equivalent changes in 0.6.9-post-fixes

OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs

@@ -331,6 +331,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// </value>
         protected HashSet<uint> m_killRecord;
         
+        protected HashSet<uint> m_attachmentsSent;        
+        
         private int m_moneyBalance;
         private int m_animationSequenceNumber = 1;
         private bool m_SendLogoutPacketWhenClosing = true;
@@ -427,6 +429,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             m_entityUpdates = new PriorityQueue(m_scene.Entities.Count);
             m_fullUpdateDataBlocksBuilder = new List<ObjectUpdatePacket.ObjectDataBlock>();
             m_killRecord = new HashSet<uint>();
+            m_attachmentsSent = new HashSet<uint>();            
 
             m_assetService = m_scene.RequestModuleInterface<IAssetService>();
             m_hyperAssets = m_scene.RequestModuleInterface<IHyperAssetService>();
@@ -3411,6 +3414,9 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             objupdate.ObjectData[0] = CreateAvatarUpdateBlock(presence);
 
             OutPacket(objupdate, ThrottleOutPacketType.Task);
+            
+            // We need to record the avatar local id since the root prim of an attachment points to this.
+            m_attachmentsSent.Add(avatar.LocalId);            
         }
 
         public void SendCoarseLocationUpdate(List<UUID> users, List<Vector3> CoarseLocations)
@@ -3466,7 +3472,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             double priority = m_prioritizer.GetUpdatePriority(this, entity);
 
             lock (m_entityUpdates.SyncRoot)
-                m_entityUpdates.Enqueue(priority, new EntityUpdate(entity, updateFlags), entity.LocalId);
+                m_entityUpdates.Enqueue(priority, new EntityUpdate(entity, updateFlags), entity.LocalId);                  
         }
 
         private void ProcessEntityUpdates(int maxUpdates)
@@ -3542,9 +3548,42 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                     if (!canUseImproved && !canUseCompressed)
                     {
                         if (update.Entity is ScenePresence)
+                        {
                             objectUpdateBlocks.Value.Add(CreateAvatarUpdateBlock((ScenePresence)update.Entity));
+                        }
                         else
-                            objectUpdateBlocks.Value.Add(CreatePrimUpdateBlock((SceneObjectPart)update.Entity, this.m_agentId));
+                        {
+                            if (update.Entity is SceneObjectPart && ((SceneObjectPart)update.Entity).IsAttachment)
+                            {
+                                SceneObjectPart sop = (SceneObjectPart)update.Entity;
+                                string text = sop.Text;
+                                if (text.IndexOf("\n") >= 0)
+                                    text = text.Remove(text.IndexOf("\n"));
+                                
+                                if (m_attachmentsSent.Contains(sop.ParentID))
+                                {
+//                                    m_log.DebugFormat(
+//                                        "[CLIENT]: Sending full info about attached prim {0} text {1}",
+//                                        sop.LocalId, text);
+                                    
+                                    objectUpdateBlocks.Value.Add(CreatePrimUpdateBlock(sop, this.m_agentId));
+                                    
+                                    m_attachmentsSent.Add(sop.LocalId);
+                                }
+                                else
+                                {
+                                    m_log.DebugFormat(
+                                        "[CLIENT]: Requeueing full update of prim {0} text {1} since we haven't sent its parent {2} yet", 
+                                        sop.LocalId, text, sop.ParentID);
+                                    
+                                    m_entityUpdates.Enqueue(double.MaxValue, update, sop.LocalId);                  
+                                }
+                            }
+                            else
+                            {                            
+                                objectUpdateBlocks.Value.Add(CreatePrimUpdateBlock((SceneObjectPart)update.Entity, this.m_agentId));
+                            }
+                        }
                     }
                     else if (!canUseImproved)
                     {

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -2066,8 +2066,34 @@ namespace OpenSim.Region.Framework.Scenes
             sceneObject.ScheduleGroupForFullUpdate();
 
             return sceneObject;
+        }    
+        
+        /// <summary>
+        /// Add an object into the scene that has come from storage
+        /// </summary>
+        ///
+        /// <param name="sceneObject"></param>
+        /// <param name="attachToBackup">
+        /// If true, changes to the object will be reflected in its persisted data
+        /// If false, the persisted data will not be changed even if the object in the scene is changed
+        /// </param>
+        /// <param name="alreadyPersisted">
+        /// If true, we won't persist this object until it changes
+        /// If false, we'll persist this object immediately
+        /// </param>
+        /// <param name="sendClientUpdates">
+        /// If true, we send updates to the client to tell it about this object
+        /// If false, we leave it up to the caller to do this
+        /// </param>
+        /// <returns>
+        /// true if the object was added, false if an object with the same uuid was already in the scene
+        /// </returns>
+        public bool AddRestoredSceneObject(
+            SceneObjectGroup sceneObject, bool attachToBackup, bool alreadyPersisted, bool sendClientUpdates)
+        {
+            return m_sceneGraph.AddRestoredSceneObject(sceneObject, attachToBackup, alreadyPersisted, sendClientUpdates);
         }
-
+        
         /// <summary>
         /// Add an object into the scene that has come from storage
         /// </summary>
@@ -2087,7 +2113,7 @@ namespace OpenSim.Region.Framework.Scenes
         public bool AddRestoredSceneObject(
             SceneObjectGroup sceneObject, bool attachToBackup, bool alreadyPersisted)
         {
-            return m_sceneGraph.AddRestoredSceneObject(sceneObject, attachToBackup, alreadyPersisted);
+            return AddRestoredSceneObject(sceneObject, attachToBackup, alreadyPersisted, true);
         }
 
         /// <summary>
@@ -2527,7 +2553,10 @@ namespace OpenSim.Region.Framework.Scenes
                 sceneObject.RootPart.AddFlag(PrimFlags.TemporaryOnRez);
                 sceneObject.RootPart.AddFlag(PrimFlags.Phantom);
 
-                AddRestoredSceneObject(sceneObject, false, false);
+                      
+                // Don't sent a full update here because this will cause full updates to be sent twice for 
+                // attachments on region crossings, resulting in viewer glitches.                
+                AddRestoredSceneObject(sceneObject, false, false, false);
 
                 // Handle attachment special case
                 SceneObjectPart RootPrim = sceneObject.RootPart;
@@ -2554,12 +2583,13 @@ namespace OpenSim.Region.Framework.Scenes
                     m_log.DebugFormat(
                         "[ATTACHMENT]: Attach to avatar {0} at position {1}", sp.UUID, grp.AbsolutePosition);
 
+                    RootPrim.RemFlag(PrimFlags.TemporaryOnRez);
+                    
                     if (AttachmentsModule != null)
                         AttachmentsModule.AttachObject(
                             sp.ControllingClient, grp.LocalId, (uint)0, grp.GroupRotation, grp.AbsolutePosition, false);
-                    
+
-                    RootPrim.RemFlag(PrimFlags.TemporaryOnRez);
+                    //grp.SendGroupFullUpdate();
-                    grp.SendGroupFullUpdate();
                 }
                 else
                 {

OpenSim/Region/Framework/Scenes/SceneGraph.cs

@@ -222,11 +222,15 @@ namespace OpenSim.Region.Framework.Scenes
         /// If true, we won't persist this object until it changes
         /// If false, we'll persist this object immediately
         /// </param>
+        /// <param name="sendClientUpdates">
+        /// If true, we send updates to the client to tell it about this object
+        /// If false, we leave it up to the caller to do this
+        /// </param>
         /// <returns>
         /// true if the object was added, false if an object with the same uuid was already in the scene
         /// </returns>
         protected internal bool AddRestoredSceneObject(
-            SceneObjectGroup sceneObject, bool attachToBackup, bool alreadyPersisted)
+            SceneObjectGroup sceneObject, bool attachToBackup, bool alreadyPersisted, bool sendClientUpdates)
         {
             if (!alreadyPersisted)
             {
@@ -234,9 +238,9 @@ namespace OpenSim.Region.Framework.Scenes
                 sceneObject.HasGroupChanged = true;
             }
 
-            return AddSceneObject(sceneObject, attachToBackup, true);
+            return AddSceneObject(sceneObject, attachToBackup, sendClientUpdates);
         }
-
+                
         /// <summary>
         /// Add a newly created object to the scene.  This will both update the scene, and send information about the
         /// new object to all clients interested in the scene.

OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs

@@ -2012,7 +2012,8 @@ namespace OpenSim.Region.Framework.Scenes
         /// </summary>
         public void ScheduleGroupForFullUpdate()
         {
-//            m_log.DebugFormat("[SOG]: Scheduling full update for {0} {1}", Name, UUID);
+            if (IsAttachment)
+                m_log.DebugFormat("[SOG]: Scheduling full update for {0} {1}", Name, LocalId);
             
             checkAtTargets();
             RootPart.ScheduleFullUpdate();