BulletSim: fix possible race condition where an prim's asset can be requested quicker than the asset fetcher returns and thus falsely reporting that an asset was not fetched and defaulting the assset to a bounding box.

3 files changed, 24 insertions, 11 deletions

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSPhysObject.cs b/OpenSim/Region/Physics/BulletSPlugin/BSPhysObject.cs
index f953c1e..6bb88c7 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSPhysObject.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSPhysObject.cs
@@ -86,7 +86,7 @@ public abstract class BSPhysObject : PhysicsActor
         PhysBody = new BulletBody(localID);
         PhysShape = new BulletShape();
 
-        LastAssetBuildFailed = false;
+        PrimAssetState = PrimAssetCondition.Unknown;
 
         // Default material type. Also sets Friction, Restitution and Density.
         SetMaterial((int)MaterialAttributes.Material.Wood);
@@ -133,9 +133,13 @@ public abstract class BSPhysObject : PhysicsActor
     // Reference to the physical shape (btCollisionShape) of this object
     public BulletShape PhysShape;
 
-    // 'true' if the mesh's underlying asset failed to build.
-    // This will keep us from looping after the first time the build failed.
-    public bool LastAssetBuildFailed { get; set; }
+    // The physical representation of the prim might require an asset fetch.
+    // The asset state is first 'Unknown' then 'Waiting' then either 'Failed' or 'Fetched'.
+    public enum PrimAssetCondition
+    {
+        Unknown, Waiting, Failed, Fetched
+    }
+    public PrimAssetCondition PrimAssetState { get; set; }
 
     // The objects base shape information. Null if not a prim type shape.
     public PrimitiveBaseShape BaseShape { get; protected set; }
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs b/OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs
index 2cbbe9a..6a5461a 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs
@@ -155,7 +155,7 @@ public class BSPrim : BSPhysObject
     public override PrimitiveBaseShape Shape {
         set {
             BaseShape = value;
-            LastAssetBuildFailed = false;
+            PrimAssetState = PrimAssetCondition.Unknown;
             ForceBodyShapeRebuild(false);
         }
     }
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSShapeCollection.cs b/OpenSim/Region/Physics/BulletSPlugin/BSShapeCollection.cs
index 457f204..a6e20a8 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSShapeCollection.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSShapeCollection.cs
@@ -930,11 +930,15 @@ public sealed class BSShapeCollection : IDisposable
             return newShape;
 
         // If this mesh has an underlying asset and we have not failed getting it before, fetch the asset
-        if (prim.BaseShape.SculptEntry && !prim.LastAssetBuildFailed && prim.BaseShape.SculptTexture != OMV.UUID.Zero)
+        if (prim.BaseShape.SculptEntry 
+            && prim.PrimAssetState != BSPhysObject.PrimAssetCondition.Failed
+            && prim.PrimAssetState != BSPhysObject.PrimAssetCondition.Waiting
+            && prim.BaseShape.SculptTexture != OMV.UUID.Zero
+            )
         {
-            DetailLog("{0},BSShapeCollection.VerifyMeshCreated,fetchAsset,lastFailed={1}", prim.LocalID, prim.LastAssetBuildFailed);
-            // This will prevent looping through this code as we keep trying to get the failed shape
-            prim.LastAssetBuildFailed = true;
+            DetailLog("{0},BSShapeCollection.VerifyMeshCreated,fetchAsset", prim.LocalID);
+            // Multiple requestors will know we're waiting for this asset
+            prim.PrimAssetState = BSPhysObject.PrimAssetCondition.Waiting;
 
             BSPhysObject xprim = prim;
             Util.FireAndForget(delegate
@@ -945,7 +949,7 @@ public sealed class BSShapeCollection : IDisposable
                         BSPhysObject yprim = xprim; // probably not necessary, but, just in case.
                         assetProvider(yprim.BaseShape.SculptTexture, delegate(AssetBase asset)
                         {
-                            bool assetFound = false;            // DEBUG DEBUG
+                            bool assetFound = false;
                             string mismatchIDs = String.Empty;  // DEBUG DEBUG
                             if (asset != null && yprim.BaseShape.SculptEntry)
                             {
@@ -963,6 +967,10 @@ public sealed class BSShapeCollection : IDisposable
                                     mismatchIDs = yprim.BaseShape.SculptTexture.ToString() + "/" + asset.ID;
                                 }
                             }
+                            if (assetFound)
+                                yprim.PrimAssetState = BSPhysObject.PrimAssetCondition.Fetched;
+                            else
+                                yprim.PrimAssetState = BSPhysObject.PrimAssetCondition.Failed;
                             DetailLog("{0},BSShapeCollection,fetchAssetCallback,found={1},isSculpt={2},ids={3}",
                                         yprim.LocalID, assetFound, yprim.BaseShape.SculptEntry, mismatchIDs );
 
@@ -970,6 +978,7 @@ public sealed class BSShapeCollection : IDisposable
                     }
                     else
                     {
+                        xprim.PrimAssetState = BSPhysObject.PrimAssetCondition.Failed;
                         PhysicsScene.Logger.ErrorFormat("{0} Physical object requires asset but no asset provider. Name={1}",
                                                     LogHeader, PhysicsScene.Name);
                     }
@@ -977,7 +986,7 @@ public sealed class BSShapeCollection : IDisposable
         }
         else
         {
-            if (prim.LastAssetBuildFailed)
+            if (prim.PrimAssetState == BSPhysObject.PrimAssetCondition.Failed)
             {
                 PhysicsScene.Logger.ErrorFormat("{0} Mesh failed to fetch asset. lID={1}, texture={2}",
                                             LogHeader, prim.LocalID, prim.BaseShape.SculptTexture);