Converted the LSL scripting engine into a IRegionModule, so now all "modules" share a common base interface and are loaded from the single loader. (It seems to work fine, but I have left the old scriptengine loader, incase we have to change back).

Removed the reference to OpenJpeg in the DynamicTextureModule, to see if that was causing the build problem someone is having. 
Added a Temporary fix for the "existing connection was forcibly closed by the remote host" exception on windows when a user logs out of a multiregion instance. 
Some early work to prepare for improving the way clients are updated (about prims etc).

OpenSim/Framework/General/Util.cs

@@ -152,15 +152,15 @@ namespace OpenSim.Framework.Utilities
             return capsPath;
         }
 
-        //public static int fast_distance2d(int x, int y)
+        public static int fast_distance2d(int x, int y)
-        //{
+        {
-        //    x = System.Math.Abs(x);
+            x = System.Math.Abs(x);
-        //    y = System.Math.Abs(y);
+            y = System.Math.Abs(y);
 
-        //    int min = System.Math.Min(x, y);
+            int min = System.Math.Min(x, y);
 
-        //    return (x + y - (min >> 1) - (min >> 2) + (min >> 4));
+            return (x + y - (min >> 1) - (min >> 2) + (min >> 4));
-        //}
+        }
 
         public static string FieldToString(byte[] bytes)
         {

OpenSim/Region/Application/OpenSimMain.cs

@@ -191,8 +191,8 @@ namespace OpenSim
             MainLog.Instance.Verbose("Loading Shared Modules");
             m_moduleLoader.LoadDefaultSharedModules(m_exceptSharedModules);
 
-            // Load all script engines found
+            // Load all script engines found (scripting engine is now a IRegionModule so loaded in the module loader
-            OpenSim.Region.Environment.Scenes.Scripting.ScriptEngineLoader ScriptEngineLoader = new OpenSim.Region.Environment.Scenes.Scripting.ScriptEngineLoader(m_log);
+            // OpenSim.Region.Environment.Scenes.Scripting.ScriptEngineLoader ScriptEngineLoader = new OpenSim.Region.Environment.Scenes.Scripting.ScriptEngineLoader(m_log);
 
             for (int i = 0; i < configFiles.Length; i++)
             {
@@ -209,11 +209,11 @@ namespace OpenSim
                 scene.SetModuleInterfaces();
 
                 // Check if we have a script engine to load
-                if (m_scriptEngine != null && m_scriptEngine != "")
+                //if (m_scriptEngine != null && m_scriptEngine != "")
-                {
+                //{
-                    OpenSim.Region.Environment.Scenes.Scripting.ScriptEngineInterface ScriptEngine = ScriptEngineLoader.LoadScriptEngine(m_scriptEngine);
+                //  OpenSim.Region.Environment.Scenes.Scripting.ScriptEngineInterface ScriptEngine = ScriptEngineLoader.LoadScriptEngine(m_scriptEngine);
-                    scene.AddScriptEngine(ScriptEngine, m_log);
+                // scene.AddScriptEngine(ScriptEngine, m_log);
-                }
+                //}
 
                 //Server side object editing permissions checking
                 if (m_permissions)
@@ -603,7 +603,7 @@ namespace OpenSim
             string result = "";
             for (int i = pos; i < commandParams.Length; i++)
             {
-                result += commandParams[i] +" ";
+                result += commandParams[i] + " ";
             }
             result = result.TrimEnd(' ');
             return result;

OpenSim/Region/ClientStack/ClientView.cs

@@ -128,6 +128,14 @@ namespace OpenSim.Region.ClientStack
             m_networkServer.RemoveClientCircuit(this.CircuitCode);
             this.ClientThread.Abort();
         }
+
+        public override void ConnectionClosed()
+        {
+            clientPingTimer.Stop();
+            m_clientThreads.Remove(this.CircuitCode);
+            m_networkServer.RemoveClientCircuit(this.CircuitCode);
+            this.ClientThread.Abort();
+        }
         #endregion
 
         # region Packet Handling

OpenSim/Region/ClientStack/ClientViewBase.cs

@@ -315,6 +315,10 @@ namespace OpenSim.Region.ClientStack
 
         }
 
+        public virtual void ConnectionClosed()
+        {
+        }
+
         #region Nested Classes
 
         public class QueItem

OpenSim/Region/ClientStack/PacketServer.cs

@@ -74,6 +74,14 @@ namespace OpenSim.Region.ClientStack
             }
         }
 
+        public virtual void ConnectionClosed(uint circuitCode)
+        {
+            if (this.ClientThreads.ContainsKey(circuitCode))
+            {
+                ClientThreads[circuitCode].ConnectionClosed();
+            }
+        }
+
         /// <summary>
         /// 
         /// </summary>

OpenSim/Region/ClientStack/UDPServer.cs

@@ -101,7 +101,23 @@ namespace OpenSim.Region.ClientStack
             ipeSender = new IPEndPoint(IPAddress.Parse("0.0.0.0"), 0);
             epSender = (EndPoint)ipeSender;
             Packet packet = null;
-            int numBytes = Server.EndReceiveFrom(result, ref epSender);
+
+            int numBytes;
+
+            try
+            {
+                numBytes = Server.EndReceiveFrom(result, ref epSender);
+            }
+            catch (System.Net.Sockets.SocketException)
+            {
+                Console.WriteLine("Remote host Closed connection");
+                this._packetServer.ConnectionClosed(this.clientCircuits[epSender]);
+                ipeSender = new IPEndPoint(IPAddress.Parse("0.0.0.0"), 0);
+                epSender = (EndPoint)ipeSender;
+                Server.BeginReceiveFrom(RecvBuffer, 0, RecvBuffer.Length, SocketFlags.None, ref epSender, ReceivedData, null);
+                return;
+            }
+
             int packetEnd = numBytes - 1;
 
             packet = Packet.BuildPacket(RecvBuffer, ref packetEnd, ZeroBuffer);

OpenSim/Region/Environment/ModuleLoader.cs

@@ -44,6 +44,9 @@ namespace OpenSim.Region.Environment
             LoadedModules.Add(avatarProfiles);
 
             this.LoadRegionModule("OpenSim.Region.ExtensionsScriptModule.dll", "ExtensionsScriptingModule", scene);
+
+            string lslPath = System.IO.Path.Combine("ScriptEngines", "OpenSim.Region.ScriptEngine.DotNetEngine.dll");
+            this.LoadRegionModule(lslPath, "LSLScriptingModule", scene);
         }
 
         public void LoadDefaultSharedModules(string exceptModules)

OpenSim/Region/Environment/Modules/DynamicTextureModule.cs

@@ -5,7 +5,6 @@ using System.Threading;
 using System.IO;
 using System.Collections.Generic;
 using libsecondlife;
-using OpenJPEGNet;
 using OpenSim.Region.Environment.Scenes;
 using OpenSim.Region.Environment.Interfaces;
 using OpenSim.Framework.Interfaces;

OpenSim/Region/Environment/Scenes/Scene.cs

@@ -44,6 +44,7 @@ using OpenSim.Framework.Communications.Caches;
 using OpenSim.Region.Environment.LandManagement;
 using OpenSim.Region.Environment;
 using OpenSim.Region.Environment.Interfaces;
+using OpenSim.Region.Environment.Types;
 using OpenSim.Region.Terrain;
 using OpenSim.Framework.Data;
 using Caps = OpenSim.Region.Capabilities.Caps;
@@ -72,6 +73,8 @@ namespace OpenSim.Region.Environment.Scenes
         private int m_timePhase = 24;
         private int m_timeUpdateCount;
 
+        public BasicQuadTreeNode QuadTree;
+
         private Mutex updateLock;
 
         protected ModuleLoader m_moduleLoader;
@@ -178,6 +181,10 @@ namespace OpenSim.Region.Environment.Scenes
 
             m_eventManager.OnPermissionError += SendPermissionAlert;
 
+            QuadTree = new BasicQuadTreeNode(null, 0, 0, 256, 256);
+            QuadTree.Subdivide();
+            QuadTree.Subdivide();
+
             MainLog.Instance.Verbose("Creating new entitities instance");
             Entities = new Dictionary<LLUUID, EntityBase>();
             Avatars = new Dictionary<LLUUID, ScenePresence>();
@@ -596,6 +603,7 @@ namespace OpenSim.Region.Environment.Scenes
         {
             if (!Entities.ContainsKey(sceneObject.UUID))
             {
+                QuadTree.AddObject(sceneObject);
                 Entities.Add(sceneObject.UUID, sceneObject);
             }
         }

OpenSim/Region/Environment/Scenes/SceneObjectPart.cs

@@ -43,6 +43,9 @@ namespace OpenSim.Region.Environment.Scenes
 
         protected byte[] m_particleSystem = new byte[0];
 
+        public uint TimeStampFull = 0;
+        public uint TimeStampTerse = 0;
+
         protected SceneObjectGroup m_parentGroup;
 
         /// <summary>
@@ -366,6 +369,7 @@ namespace OpenSim.Region.Environment.Scenes
             {
                 m_parentGroup.HasChanged = true;
             }
+            this.TimeStampFull =(uint) Util.UnixTimeSinceEpoch();
             m_updateFlag = 2;
         }
 
@@ -380,6 +384,7 @@ namespace OpenSim.Region.Environment.Scenes
                 {
                     m_parentGroup.HasChanged = true;
                 }
+                this.TimeStampTerse = (uint)Util.UnixTimeSinceEpoch();
                 m_updateFlag = 1;
             }
         }

OpenSim/Region/Environment/Scenes/ScenePresence.cs

@@ -88,11 +88,13 @@ namespace OpenSim.Region.Environment.Scenes
         public delegate void SignificantClientMovement(IClientAPI remote_client);
         public event SignificantClientMovement OnSignificantClientMovement;
 
+        public List<SceneObjectGroup> InterestList = new List<SceneObjectGroup>();
+
        // private Queue<SceneObjectGroup> m_fullGroupUpdates = new Queue<SceneObjectGroup>();
        // private Queue<SceneObjectGroup> m_terseGroupUpdates = new Queue<SceneObjectGroup>();
 
         private Queue<SceneObjectPart> m_fullPartUpdates = new Queue<SceneObjectPart>();
-        private Queue<SceneObjectPart> m_teserPartUpdates = new Queue<SceneObjectPart>();
+        private Queue<SceneObjectPart> m_tersePartUpdates = new Queue<SceneObjectPart>();
 
         #region Properties
         /// <summary>
@@ -201,7 +203,7 @@ namespace OpenSim.Region.Environment.Scenes
 
         public void AddTersePart(SceneObjectPart part)
         {
-            m_teserPartUpdates.Enqueue(part);
+            m_tersePartUpdates.Enqueue(part);
         }
 
         public void AddFullPart(SceneObjectPart part)
@@ -211,18 +213,18 @@ namespace OpenSim.Region.Environment.Scenes
 
         public void SendPrimUpdates()
         {
-            if (m_teserPartUpdates.Count > 0)
+            if (m_tersePartUpdates.Count > 0)
             {
                 bool terse = true;
                 int terseCount = 0;
 
                 while (terse)
                 {
-                    SceneObjectPart part = m_teserPartUpdates.Dequeue();
+                    SceneObjectPart part = m_tersePartUpdates.Dequeue();
                     part.SendTerseUpdate(this.ControllingClient);
                     terseCount++;
 
-                    if ((m_teserPartUpdates.Count < 1) |(terseCount > 30))
+                    if ((m_tersePartUpdates.Count < 1) |(terseCount > 30))
                     {
                         terse = false;
                     }

OpenSim/Region/Environment/Types/BasicQuadTreeNode.cs

@@ -0,0 +1,167 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OpenSim.Region.Environment.Scenes;
+
+namespace OpenSim.Region.Environment.Types
+{
+    public class BasicQuadTreeNode
+    {
+        private List<SceneObjectGroup> m_objects = new List<SceneObjectGroup>();
+        private BasicQuadTreeNode[] m_childNodes = null;
+        private BasicQuadTreeNode m_parent = null;
+
+        private short m_leftX;
+        private short m_leftY;
+        private short m_width;
+        private short m_height;
+
+        public BasicQuadTreeNode(BasicQuadTreeNode parent, short leftX, short leftY, short width, short height)
+        {
+            m_parent = parent;
+            m_leftX = leftX;
+            m_leftY = leftY;
+            m_width = width;
+            m_height = height;
+        }
+
+        public void AddObject(SceneObjectGroup obj)
+        {
+            if (m_childNodes == null)
+            {
+                if (!m_objects.Contains(obj))
+                {
+                    m_objects.Add(obj);
+                }
+            }
+            else
+            {
+                if (obj.AbsolutePosition.X < (m_leftX + (m_width / 2)))
+                {
+                    if (obj.AbsolutePosition.Y < (m_leftY + (m_height / 2)))
+                    {
+                        m_childNodes[0].AddObject(obj);
+                    }
+                    else
+                    {
+                        m_childNodes[2].AddObject(obj);
+                    }
+                }
+                else
+                {
+                    if (obj.AbsolutePosition.Y < (m_leftY + (m_height / 2)))
+                    {
+                        m_childNodes[1].AddObject(obj);
+                    }
+                    else
+                    {
+                        m_childNodes[3].AddObject(obj);
+                    }
+                }
+            }
+        }
+
+        public void Subdivide()
+        {
+            if (m_childNodes == null)
+            {
+                m_childNodes = new BasicQuadTreeNode[4];
+                m_childNodes[0] = new BasicQuadTreeNode(this, m_leftX, m_leftY,(short) (m_width / 2), (short)( m_height / 2));
+                m_childNodes[1] = new BasicQuadTreeNode(this,(short)( m_leftX + (m_width / 2)), m_leftY,(short)( m_width / 2),(short) (m_height / 2));
+                m_childNodes[2] = new BasicQuadTreeNode(this, m_leftX, (short)( m_leftY + (m_height / 2)), (short)(m_width / 2),(short)( m_height / 2));
+                m_childNodes[3] = new BasicQuadTreeNode(this, (short)( m_leftX + (m_width / 2)),(short)( m_height + (m_height / 2)),(short)( m_width / 2), (short)(m_height / 2));
+            }
+            else
+            {
+                for (int i = 0; i < m_childNodes.Length; i++)
+                {
+                    m_childNodes[i].Subdivide();
+                }
+            }
+        }
+
+        public List<SceneObjectGroup> GetObjectsFrom(int x, int y)
+        {
+            if (m_childNodes == null)
+            {
+                return m_objects;
+            }
+            else
+            {
+                if (x < (m_leftX + (m_width / 2)))
+                {
+                    if (y < (m_leftY + (m_height / 2)))
+                    {
+                        return m_childNodes[0].GetObjectsFrom(x, y);
+                    }
+                    else
+                    {
+                        return m_childNodes[2].GetObjectsFrom(x, y);
+                    }
+                }
+                else
+                {
+                    if (y < (m_leftY + (m_height / 2)))
+                    {
+                        return m_childNodes[1].GetObjectsFrom(x, y);
+                    }
+                    else
+                    {
+                        return m_childNodes[3].GetObjectsFrom(x, y);
+                    }
+                }
+            }
+        }
+
+        public void Update()
+        {
+            if (m_childNodes != null)
+            {
+                for (int i = 0; i < 4; i++)
+                {
+                    m_childNodes[i].Update();
+                }
+            }
+            else
+            {
+                List<SceneObjectGroup> outBounds = new List<SceneObjectGroup>();
+                foreach (SceneObjectGroup group in m_objects)
+                {
+                    if (((group.AbsolutePosition.X > m_leftX) && (group.AbsolutePosition.X < (m_leftX + m_width))) && ((group.AbsolutePosition.Y > m_leftY) && (group.AbsolutePosition.Y < (m_leftY + m_height))))
+                    {
+                        //still in bounds
+                    }
+                    else
+                    {
+                        outBounds.Add(group);
+                    }
+                }
+
+                foreach (SceneObjectGroup removee in outBounds)
+                {
+                    m_objects.Remove(removee);
+                    if (m_parent != null)
+                    {
+                        m_parent.PassUp(removee);
+                    }
+                }
+                outBounds.Clear();
+            }
+        }
+
+        public void PassUp(SceneObjectGroup group)
+        {
+            if (((group.AbsolutePosition.X > m_leftX) && (group.AbsolutePosition.X < (m_leftX + m_width))) && ((group.AbsolutePosition.Y > m_leftY) && (group.AbsolutePosition.Y < (m_leftY + m_height))))
+            {
+                this.AddObject(group);
+            }
+            else
+            {
+                if (m_parent != null)
+                {
+                    m_parent.PassUp(group);
+                }
+            }
+        }
+    }
+}

OpenSim/Region/Environment/Types/UpdateQueue.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OpenSim.Region.Environment.Scenes;
+using libsecondlife;
+
+namespace OpenSim.Region.Environment.Types
+{
+    public class UpdateQueue
+    {
+        private Queue<SceneObjectPart> m_queue;
+
+        private List<LLUUID> m_ids;
+
+        public UpdateQueue()
+        {
+            m_queue = new Queue<SceneObjectPart>();
+            m_ids = new List<LLUUID>();
+        }
+    }
+}

OpenSim/Region/ScriptEngine/DotNetEngine/ScriptEngine.cs

@@ -30,8 +30,9 @@ using System;
 using System.Collections.Generic;
 using System.Text;
 using OpenSim.Framework.Console;
-//using OpenSim.Region.Environment.Scenes;
+using OpenSim.Region.Environment.Scenes;
 using OpenSim.Region.Environment.Scenes.Scripting;
+using OpenSim.Region.Environment.Interfaces;
 using libsecondlife;
 
 namespace OpenSim.Region.ScriptEngine.DotNetEngine
@@ -40,7 +41,7 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
     /// This is the root object for ScriptEngine
     /// </summary>
     [Serializable]
-    public class ScriptEngine : OpenSim.Region.Environment.Scenes.Scripting.ScriptEngineInterface
+    public class ScriptEngine :IRegionModule
     {
 
         internal OpenSim.Region.Environment.Scenes.Scene World;
@@ -99,5 +100,33 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
         //    Log.Status("ScriptEngine", "DEBUG FUNCTION: StartScript: " + ScriptID);
         //    myScriptManager.StartScript(ScriptID, ObjectID);
         //}
+
+        #region IRegionModule
+
+        public void Initialise(Scene scene)
+        {
+            this.InitializeEngine(scene, MainLog.Instance);
+        }
+
+        public void PostInitialise()
+        {
+
+        }
+
+        public void CloseDown()
+        {
+        }
+
+        public string GetName()
+        {
+            return "LSLScriptingModule";
+        }
+
+        public bool IsSharedModule()
+        {
+            return false;
+        }
+
+        #endregion
     }
 }