6 files changed, 73 insertions, 21 deletions

diff --git a/OpenSim/Framework/Util.cs b/OpenSim/Framework/Util.cs
index 533e53a..5a5046e 100644
--- a/OpenSim/Framework/Util.cs
+++ b/OpenSim/Framework/Util.cs
@@ -459,10 +459,17 @@ namespace OpenSim.Framework
         /// <param name="oldy">Old region y-coord</param>
         /// <param name="newy">New region y-coord</param>
         /// <returns></returns>        
-        public static bool IsOutsideView(uint oldx, uint newx, uint oldy, uint newy)
+        public static bool IsOutsideView(float drawdist, uint oldx, uint newx, uint oldy, uint newy)
         {
-            // Eventually this will be a function of the draw distance / camera position too.
-            return (((int)Math.Abs((int)(oldx - newx)) > 1) || ((int)Math.Abs((int)(oldy - newy)) > 1));
+            int dd = (int)((drawdist + Constants.RegionSize - 1) / Constants.RegionSize);
+
+            int startX = (int)oldx - dd;
+            int startY = (int)oldy - dd;
+
+            int endX = (int)oldx + dd;
+            int endY = (int)oldy + dd;
+
+            return (newx < startX || endX < newx || newy < startY || endY < newy);
         }
 
         public static string FieldToString(byte[] bytes)
diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index 98aa563..95c771e 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -318,7 +318,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                     agentCircuit.Id0 = currentAgentCircuit.Id0;
                 }
 
-                if (NeedsNewAgent(oldRegionX, newRegionX, oldRegionY, newRegionY))
+                if (NeedsNewAgent(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
                 {
                     // brand new agent, let's create a new caps seed
                     agentCircuit.CapsPath = CapsUtil.GetRandomCapsObjectPath();
@@ -336,7 +336,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 // OK, it got this agent. Let's close some child agents
                 sp.CloseChildAgents(newRegionX, newRegionY);
                 IClientIPEndpoint ipepClient;  
-                if (NeedsNewAgent(oldRegionX, newRegionX, oldRegionY, newRegionY))
+                if (NeedsNewAgent(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
                 {
                     //sp.ControllingClient.SendTeleportProgress(teleportFlags, "Creating agent...");
                     #region IP Translation for NAT
@@ -447,7 +447,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
                 // Finally, let's close this previously-known-as-root agent, when the jump is outside the view zone
 
-                if (NeedsClosing(oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
+                if (NeedsClosing(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
                 {
                     Thread.Sleep(5000);
                     sp.Close();
@@ -521,14 +521,14 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             return region;
         }
 
-        protected virtual bool NeedsNewAgent(uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY)
+        protected virtual bool NeedsNewAgent(float drawdist, uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY)
         {
-            return Util.IsOutsideView(oldRegionX, newRegionX, oldRegionY, newRegionY);
+            return Util.IsOutsideView(drawdist, oldRegionX, newRegionX, oldRegionY, newRegionY);
         }
 
-        protected virtual bool NeedsClosing(uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY, GridRegion reg)
+        protected virtual bool NeedsClosing(float drawdist, uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY, GridRegion reg)
         {
-            return Util.IsOutsideView(oldRegionX, newRegionX, oldRegionY, newRegionY);
+            return Util.IsOutsideView(drawdist, oldRegionX, newRegionX, oldRegionY, newRegionY);
         }
 
         protected virtual bool IsOutsideRegion(Scene s, Vector3 pos)
@@ -1045,7 +1045,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             if (m_regionInfo != null)
             {
-                neighbours = RequestNeighbours(sp.Scene, m_regionInfo.RegionLocX, m_regionInfo.RegionLocY);
+                neighbours = RequestNeighbours(sp, m_regionInfo.RegionLocX, m_regionInfo.RegionLocY);
             }
             else
             {
@@ -1272,8 +1272,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// <param name="pRegionLocX"></param>
         /// <param name="pRegionLocY"></param>
         /// <returns></returns>        
-        protected List<GridRegion> RequestNeighbours(Scene pScene, uint pRegionLocX, uint pRegionLocY)
+        protected List<GridRegion> RequestNeighbours(ScenePresence avatar, uint pRegionLocX, uint pRegionLocY)
         {
+            Scene pScene = avatar.Scene;
             RegionInfo m_regionInfo = pScene.RegionInfo;
 
             Border[] northBorders = pScene.NorthBorders.ToArray();
@@ -1281,10 +1282,24 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             Border[] eastBorders = pScene.EastBorders.ToArray();
             Border[] westBorders = pScene.WestBorders.ToArray();
 
-            // Legacy one region.  Provided for simplicity while testing the all inclusive method in the else statement.
+            // Leaving this as a "megaregions" computation vs "non-megaregions" computation; it isn't
+            // clear what should be done with a "far view" given that megaregions already extended the
+            // view to include everything in the megaregion
             if (northBorders.Length <= 1 && southBorders.Length <= 1 && eastBorders.Length <= 1 && westBorders.Length <= 1)
             {
-                return pScene.GridService.GetNeighbours(m_regionInfo.ScopeID, m_regionInfo.RegionID);
+                int dd = avatar.DrawDistance < Constants.RegionSize ? (int)Constants.RegionSize : (int)avatar.DrawDistance;
+
+                int startX = (int)pRegionLocX * (int)Constants.RegionSize - dd + (int)(Constants.RegionSize/2);
+                int startY = (int)pRegionLocY * (int)Constants.RegionSize - dd + (int)(Constants.RegionSize/2);
+
+                int endX = (int)pRegionLocX * (int)Constants.RegionSize + dd + (int)(Constants.RegionSize/2);
+                int endY = (int)pRegionLocY * (int)Constants.RegionSize + dd + (int)(Constants.RegionSize/2);
+
+                List<GridRegion> neighbours =
+                    avatar.Scene.GridService.GetRegionRange(m_regionInfo.ScopeID, startX, endX, startY, endY);
+
+                neighbours.RemoveAll(delegate(GridRegion r) { return r.RegionID == m_regionInfo.RegionID; });
+                return neighbours;
             }
             else
             {
diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/HGEntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/HGEntityTransferModule.cs
index 35dcd95..79e76b4 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/HGEntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/HGEntityTransferModule.cs
@@ -130,9 +130,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             return region;
         }
 
-        protected override bool NeedsClosing(uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY, GridRegion reg)
+        protected override bool NeedsClosing(float drawdist, uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY, GridRegion reg)
         {
-            if (base.NeedsClosing(oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
+            if (base.NeedsClosing(drawdist, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
                 return true;
 
             int flags = m_aScene.GridService.GetRegionFlags(m_aScene.RegionInfo.ScopeID, reg.RegionID);
diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index ee1e0be..7def7e9 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -83,6 +83,13 @@ namespace OpenSim.Region.Framework.Scenes
         public bool m_useFlySlow;
         public bool m_usePreJump;
         public bool m_seeIntoRegionFromNeighbor;
+
+        protected float m_defaultDrawDistance = 255.0f;
+        public float DefaultDrawDistance 
+        {
+            get { return m_defaultDrawDistance; }
+        }
+        
         // TODO: need to figure out how allow client agents but deny
         // root agents when ACL denies access to root agent
         public bool m_strictAccessControl = true;
@@ -627,6 +634,8 @@ namespace OpenSim.Region.Framework.Scenes
                 //
                 IConfig startupConfig = m_config.Configs["Startup"];
 
+                m_defaultDrawDistance = startupConfig.GetFloat("DefaultDrawDistance",m_defaultDrawDistance);
+                
                 //Animation states
                 m_useFlySlow = startupConfig.GetBoolean("enableflyslow", false);
                 // TODO: Change default to true once the feature is supported
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 51b8dcc..9e9481e 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -626,7 +626,7 @@ namespace OpenSim.Region.Framework.Scenes
                 Utils.LongToUInts(handle, out x, out y);
                 x = x / Constants.RegionSize;
                 y = y / Constants.RegionSize;
-                if (Util.IsOutsideView(x, Scene.RegionInfo.RegionLocX, y, Scene.RegionInfo.RegionLocY))
+                if (Util.IsOutsideView(DrawDistance, x, Scene.RegionInfo.RegionLocX, y, Scene.RegionInfo.RegionLocY))
                 {
                     old.Add(handle);
                 }
@@ -700,6 +700,7 @@ namespace OpenSim.Region.Framework.Scenes
         
         private ScenePresence(IClientAPI client, Scene world, RegionInfo reginfo) : this()
         {
+            m_DrawDistance = world.DefaultDrawDistance;
             m_rootRegionHandle = reginfo.RegionHandle;
             m_controllingClient = client;
             m_firstname = m_controllingClient.FirstName;
@@ -1279,7 +1280,11 @@ namespace OpenSim.Region.Framework.Scenes
             m_CameraUpAxis = agentData.CameraUpAxis;
 
             // The Agent's Draw distance setting
-            m_DrawDistance = agentData.Far;
+            // When we get to the point of re-computing neighbors everytime this
+            // changes, then start using the agent's drawdistance rather than the 
+            // region's draw distance.
+            // m_DrawDistance = agentData.Far;
+            m_DrawDistance = Scene.DefaultDrawDistance;
 
             // Check if Client has camera in 'follow cam' or 'build' mode.
             Vector3 camdif = (Vector3.One * m_bodyRot - Vector3.One * CameraRotation);
@@ -2913,7 +2918,7 @@ namespace OpenSim.Region.Framework.Scenes
 
                         //m_log.Debug("---> x: " + x + "; newx:" + newRegionX + "; Abs:" + (int)Math.Abs((int)(x - newRegionX)));
                         //m_log.Debug("---> y: " + y + "; newy:" + newRegionY + "; Abs:" + (int)Math.Abs((int)(y - newRegionY)));
-                        if (Util.IsOutsideView(x, newRegionX, y, newRegionY))
+                        if (Util.IsOutsideView(DrawDistance, x, newRegionX, y, newRegionY))
                         {
                             byebyeRegions.Add(handle);
                         }
@@ -2989,7 +2994,12 @@ namespace OpenSim.Region.Framework.Scenes
 
             Vector3 offset = new Vector3(shiftx, shifty, 0f);
 
-            m_DrawDistance = cAgentData.Far;
+            // When we get to the point of re-computing neighbors everytime this
+            // changes, then start using the agent's drawdistance rather than the 
+            // region's draw distance.
+            // m_DrawDistance = cAgentData.Far;
+            m_DrawDistance = Scene.DefaultDrawDistance;
+            
             if (cAgentData.Position != new Vector3(-1f, -1f, -1f)) // UGH!!
                 m_pos = cAgentData.Position + offset;
 
@@ -3139,7 +3149,11 @@ namespace OpenSim.Region.Framework.Scenes
             m_CameraLeftAxis = cAgent.LeftAxis;
             m_CameraUpAxis = cAgent.UpAxis;
 
-            m_DrawDistance = cAgent.Far;
+            // When we get to the point of re-computing neighbors everytime this
+            // changes, then start using the agent's drawdistance rather than the 
+            // region's draw distance.
+            // m_DrawDistance = cAgent.Far;
+            m_DrawDistance = Scene.DefaultDrawDistance;
 
             if ((cAgent.Throttles != null) && cAgent.Throttles.Length > 0)
                 ControllingClient.SetChildAgentThrottle(cAgent.Throttles);
diff --git a/bin/OpenSimDefaults.ini b/bin/OpenSimDefaults.ini
index 475d4a0..96ffb7e 100644
--- a/bin/OpenSimDefaults.ini
+++ b/bin/OpenSimDefaults.ini
@@ -94,6 +94,13 @@
     ; Warning!  Don't use this with regions that have existing content!, This will likely break them
     CombineContiguousRegions = false
 
+    ; Extend the region's draw distance; 255m is the default which includes
+    ; one neighbor on each side of the current region, 767m would go three
+    ; neighbors on each side for a total of 49 regions in view. Warning, unless
+    ; all the regions have the same drawdistance, you will end up with strange
+    ; effects because the agents that get closed may be inconsistent.
+    ; DefaultDrawDistance = 255.0
+
     ; If you have only one region in an instance, or to avoid the many bugs
     ; that you can trigger in modules by restarting a region, set this to
     ; true to make the entire instance exit instead of restarting the region.