From 46db73b62baec7baf0e33d83efbaafaadcd4db0d Mon Sep 17 00:00:00 2001
From: "Teravus Ovares (Dan Olivares)" <teravus@gmail.com>
Date: Thu, 23 Dec 2010 03:30:09 -0500
Subject: [PATCH] * Re-Adding Scene TimeDilation to Object Update Packets. *
 Added Calculating Time Dilation in the OdePlubin * When multiple object
 updates are stuffed into one packet, average the time dilation between them
 as a compromise. * Time Dilation on the update is calculated when the
 EntityUpdate object is created.  The pre-calc-ed TD is stored in the Entity
 update and used when it goes out on the wire.  Previously, it was 1.0 all the
 time. The time dilation is tied to when the update is created, not when the
 update is sent.

---
 OpenSim/Framework/IClientAPI.cs               |  4 +++-
 .../ClientStack/LindenUDP/LLClientView.cs     | 18 ++++++++++++------
 OpenSim/Region/Physics/OdePlugin/OdePlugin.cs | 19 +++++++++++++++++++
 3 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/OpenSim/Framework/IClientAPI.cs b/OpenSim/Framework/IClientAPI.cs
index 6bca6eb02f..21ffa9a954 100644
--- a/OpenSim/Framework/IClientAPI.cs
+++ b/OpenSim/Framework/IClientAPI.cs
@@ -574,11 +574,13 @@ namespace OpenSim.Framework
     {
         public ISceneEntity Entity;
         public PrimUpdateFlags Flags;
+        public float TimeDilation;
 
-        public EntityUpdate(ISceneEntity entity, PrimUpdateFlags flags)
+        public EntityUpdate(ISceneEntity entity, PrimUpdateFlags flags, float timedilation)
         {
             Entity = entity;
             Flags = flags;
+            TimeDilation = timedilation;
         }
     }
 
diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs b/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
index 929f28251c..f27a6ebffe 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs
@@ -3554,7 +3554,7 @@ 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, m_scene.TimeDilation), entity.LocalId);
         }
 
         private void ProcessEntityUpdates(int maxUpdates)
@@ -3570,14 +3570,17 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             // We must lock for both manipulating the kill record and sending the packet, in order to avoid a race
             // condition where a kill can be processed before an out-of-date update for the same object.                        
             lock (m_killRecord)
-            {                
+            {
+                float avgTimeDilation = 1.0f;
                 EntityUpdate update;
                 while (updatesThisCall < maxUpdates)
                 {
                     lock (m_entityUpdates.SyncRoot)
                         if (!m_entityUpdates.TryDequeue(out update))
                             break;
-    
+                    avgTimeDilation += update.TimeDilation;
+                    avgTimeDilation *= 0.5f;
+
                     if (update.Entity is SceneObjectPart)
                     {
                         SceneObjectPart part = (SceneObjectPart)update.Entity;
@@ -3725,8 +3728,10 @@ namespace OpenSim.Region.ClientStack.LindenUDP
     
                 #region Packet Sending
         
-                const float TIME_DILATION = 1.0f;
-                ushort timeDilation = Utils.FloatToUInt16(TIME_DILATION, 0.0f, 1.0f);
+                //const float TIME_DILATION = 1.0f;
+
+
+                ushort timeDilation = Utils.FloatToUInt16(avgTimeDilation, 0.0f, 1.0f);
     
                 if (terseAgentUpdateBlocks.IsValueCreated)
                 {
@@ -3739,7 +3744,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
     
                     for (int i = 0; i < blocks.Count; i++)
                         packet.ObjectData[i] = blocks[i];
-    
+
+                    
                     OutPacket(packet, ThrottleOutPacketType.Unknown, true);
                 }
     
diff --git a/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs b/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
index 7fd59a0ebf..eb97f41e3c 100644
--- a/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
+++ b/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
@@ -287,6 +287,9 @@ namespace OpenSim.Region.Physics.OdePlugin
         private OdePrim cp1;
         private OdeCharacter cc2;
         private OdePrim cp2;
+        private int tickCountFrameRun;
+        
+        private int latertickcount=0;
         //private int cStartStop = 0;
         //private string cDictKey = "";
 
@@ -3123,6 +3126,22 @@ namespace OpenSim.Region.Physics.OdePlugin
                     }
                     d.WorldExportDIF(world, fname, physics_logging_append_existing_logfile, prefix);
                 }
+                latertickcount = Util.EnvironmentTickCount() - tickCountFrameRun;
+
+                // OpenSimulator above does 10 fps.  10 fps = means that the main thread loop and physics
+                // has a max of 100 ms to run theoretically.
+                // If the main loop stalls, it calls Simulate later which makes the tick count ms larger.
+                // If Physics stalls, it takes longer which makes the tick count ms larger.
+
+                if (latertickcount < 100)
+                    m_timeDilation = 1.0f;
+                else
+                {
+                    m_timeDilation = 100f / latertickcount;
+                    //m_timeDilation = Math.Min((Math.Max(100 - (Util.EnvironmentTickCount() - tickCountFrameRun), 1) / 100f), 1.0f);
+                }
+
+                tickCountFrameRun = Util.EnvironmentTickCount();
             }
 
             return fps;