2 files changed, 92 insertions, 64 deletions

diff --git a/OpenSim/Region/Physics/Meshing/Mesh.cs b/OpenSim/Region/Physics/Meshing/Mesh.cs
index ceafaad..7567556 100644
--- a/OpenSim/Region/Physics/Meshing/Mesh.cs
+++ b/OpenSim/Region/Physics/Meshing/Mesh.cs
@@ -40,7 +40,6 @@ namespace OpenSim.Region.Physics.Meshing
         private List<Triangle> triangles;
         GCHandle pinnedVirtexes;
         GCHandle pinnedIndex;
-        public PrimMesh primMesh = null;
         public float[] normals;
 
         public Mesh()
@@ -63,6 +62,8 @@ namespace OpenSim.Region.Physics.Meshing
 
         public void Add(Triangle triangle)
         {
+            if (pinnedIndex.IsAllocated || pinnedVirtexes.IsAllocated)
+                throw new NotSupportedException("Attempt to Add to a pinned Mesh");
             // If a vertex of the triangle is not yet in the vertices list,
             // add it and set its index to the current index count
             if (!vertices.ContainsKey(triangle.v1))
@@ -148,40 +149,22 @@ namespace OpenSim.Region.Physics.Meshing
 
         public float[] getVertexListAsFloatLocked()
         {
+            if( pinnedVirtexes.IsAllocated )
+                return (float[])(pinnedVirtexes.Target);
             float[] result;
 
-            if (primMesh == null)
+            //m_log.WarnFormat("vertices.Count = {0}", vertices.Count);
+            result = new float[vertices.Count * 3];
+            foreach (KeyValuePair<Vertex, int> kvp in vertices)
             {
-                //m_log.WarnFormat("vertices.Count = {0}", vertices.Count);
-                result = new float[vertices.Count * 3];
-                foreach (KeyValuePair<Vertex, int> kvp in vertices)
-                {
-                    Vertex v = kvp.Key;
-                    int i = kvp.Value;
-                    //m_log.WarnFormat("kvp.Value = {0}", i);
-                    result[3 * i + 0] = v.X;
-                    result[3 * i + 1] = v.Y;
-                    result[3 * i + 2] = v.Z;
-                }
-                pinnedVirtexes = GCHandle.Alloc(result, GCHandleType.Pinned);
-            }
-            else
-            {
-                int count = primMesh.coords.Count;
-                result = new float[count * 3];
-                for (int i = 0; i < count; i++)
-                {
-                    Coord c = primMesh.coords[i];
-                    {
-                        int resultIndex = 3 * i;
-                        result[resultIndex] = c.X;
-                        result[resultIndex + 1] = c.Y;
-                        result[resultIndex + 2] = c.Z;
-                    }
-
-                }
-                pinnedVirtexes = GCHandle.Alloc(result, GCHandleType.Pinned);
+                Vertex v = kvp.Key;
+                int i = kvp.Value;
+                //m_log.WarnFormat("kvp.Value = {0}", i);
+                result[3 * i + 0] = v.X;
+                result[3 * i + 1] = v.Y;
+                result[3 * i + 2] = v.Z;
             }
+            pinnedVirtexes = GCHandle.Alloc(result, GCHandleType.Pinned);
             return result;
         }
 
@@ -189,33 +172,13 @@ namespace OpenSim.Region.Physics.Meshing
         {
             int[] result;
 
-            if (primMesh == null)
-            {
-                result = new int[triangles.Count * 3];
-                for (int i = 0; i < triangles.Count; i++)
-                {
-                    Triangle t = triangles[i];
-                    result[3 * i + 0] = vertices[t.v1];
-                    result[3 * i + 1] = vertices[t.v2];
-                    result[3 * i + 2] = vertices[t.v3];
-                }
-            }
-            else
+            result = new int[triangles.Count * 3];
+            for (int i = 0; i < triangles.Count; i++)
             {
-                int numFaces = primMesh.faces.Count;
-                result = new int[numFaces * 3];
-                for (int i = 0; i < numFaces; i++)
-                {
-                    Face f = primMesh.faces[i];
-//                    Coord c1 = primMesh.coords[f.v1];
-//                    Coord c2 = primMesh.coords[f.v2];
-//                    Coord c3 = primMesh.coords[f.v3];
-
-                    int resultIndex = i * 3;
-                    result[resultIndex] = f.v1;
-                    result[resultIndex + 1] = f.v2;
-                    result[resultIndex + 2] = f.v3;
-                }
+                Triangle t = triangles[i];
+                result[3 * i + 0] = vertices[t.v1];
+                result[3 * i + 1] = vertices[t.v2];
+                result[3 * i + 2] = vertices[t.v3];
             }
             return result;
         }
@@ -226,6 +189,9 @@ namespace OpenSim.Region.Physics.Meshing
         /// <returns></returns>
         public int[] getIndexListAsIntLocked()
         {
+            if (pinnedIndex.IsAllocated)
+                return (int[])(pinnedIndex.Target);
+        
             int[] result = getIndexListAsInt();
             pinnedIndex = GCHandle.Alloc(result, GCHandleType.Pinned);
 
@@ -245,11 +211,13 @@ namespace OpenSim.Region.Physics.Meshing
         {
             triangles = null;
             vertices = null;
-            primMesh = null;
         }
 
         public void Append(IMesh newMesh)
         {
+            if (pinnedIndex.IsAllocated || pinnedVirtexes.IsAllocated)
+                throw new NotSupportedException("Attempt to Append to a pinned Mesh");
+        
             if (!(newMesh is Mesh))
                 return;
 
@@ -260,6 +228,9 @@ namespace OpenSim.Region.Physics.Meshing
         // Do a linear transformation of  mesh.
         public void TransformLinear(float[,] matrix, float[] offset)
         {
+            if (pinnedIndex.IsAllocated || pinnedVirtexes.IsAllocated)
+                throw new NotSupportedException("Attempt to TransformLinear a pinned Mesh");
+        
             foreach (Vertex v in vertices.Keys)
             {
                 if (v == null)
diff --git a/OpenSim/Region/Physics/Meshing/Meshmerizer.cs b/OpenSim/Region/Physics/Meshing/Meshmerizer.cs
index f469ad6..0873035 100644
--- a/OpenSim/Region/Physics/Meshing/Meshmerizer.cs
+++ b/OpenSim/Region/Physics/Meshing/Meshmerizer.cs
@@ -76,6 +76,7 @@ namespace OpenSim.Region.Physics.Meshing
 
         private float minSizeForComplexMesh = 0.2f; // prims with all dimensions smaller than this will have a bounding box mesh
 
+        private Dictionary<ulong, Mesh> m_uniqueMeshes = new Dictionary<ulong, Mesh>();
 
         /// <summary>
         /// creates a simple box mesh of the specified size. This mesh is of very low vertex count and may
@@ -170,9 +171,62 @@ namespace OpenSim.Region.Physics.Meshing
 
         }
 
-        public Mesh CreateMeshFromPrimMesher(string primName, PrimitiveBaseShape primShape, PhysicsVector size, float lod)
+        private ulong GetMeshKey( PrimitiveBaseShape pbs, PhysicsVector size, float lod )
+        {
+            ulong hash = 5381;
+
+            hash = djb2(hash, pbs.PathCurve);
+            hash = djb2(hash, (byte)((byte)pbs.HollowShape | (byte)pbs.ProfileShape));
+            hash = djb2(hash, pbs.PathBegin);
+            hash = djb2(hash, pbs.PathEnd);
+            hash = djb2(hash, pbs.PathScaleX);
+            hash = djb2(hash, pbs.PathScaleY);
+            hash = djb2(hash, pbs.PathShearX);
+            hash = djb2(hash, pbs.PathShearY);
+            hash = djb2(hash, (byte)pbs.PathTwist);
+            hash = djb2(hash, (byte)pbs.PathTwistBegin);
+            hash = djb2(hash, (byte)pbs.PathRadiusOffset);
+            hash = djb2(hash, (byte)pbs.PathTaperX);
+            hash = djb2(hash, (byte)pbs.PathTaperY);
+            hash = djb2(hash, pbs.PathRevolutions);
+            hash = djb2(hash, (byte)pbs.PathSkew);
+            hash = djb2(hash, pbs.ProfileBegin);
+            hash = djb2(hash, pbs.ProfileEnd);
+            hash = djb2(hash, pbs.ProfileHollow);
+
+            // TODO: Separate scale out from the primitive shape data (after
+            // scaling is supported at the physics engine level)
+            byte[] scaleBytes = size.GetBytes();
+            for (int i = 0; i < scaleBytes.Length; i++)
+                hash = djb2(hash, scaleBytes[i]);
+
+            // Include LOD in hash, accounting for endianness
+            byte[] lodBytes = new byte[4];
+            Buffer.BlockCopy(BitConverter.GetBytes(lod), 0, lodBytes, 0, 4);
+            if (!BitConverter.IsLittleEndian)
+            {
+                Array.Reverse(lodBytes, 0, 4);
+            }
+            for (int i = 0; i < lodBytes.Length; i++)
+                hash = djb2(hash, lodBytes[i]);
+
+            return hash;
+        }
+
+        private ulong djb2(ulong hash, byte c)
+        {
+            return ((hash << 5) + hash) + (ulong)c;
+        }
+
+        private ulong djb2(ulong hash, ushort c)
+        {
+            hash = ((hash << 5) + hash) + (ulong)((byte)c);
+            return ((hash << 5) + hash) + (ulong)(c >> 8);
+        }
+        
+
+        private Mesh CreateMeshFromPrimMesher(string primName, PrimitiveBaseShape primShape, PhysicsVector size, float lod)
         {
-            Mesh mesh = new Mesh();
             PrimMesh primMesh;
             PrimMesher.SculptMesh sculptMesh;
 
@@ -385,8 +439,6 @@ namespace OpenSim.Region.Physics.Meshing
 
                 coords = primMesh.coords;
                 faces = primMesh.faces;
-
-
             }
 
 
@@ -401,13 +453,13 @@ namespace OpenSim.Region.Physics.Meshing
                 vertices.Add(new Vertex(c.X, c.Y, c.Z));
             }
 
+            Mesh mesh = new Mesh();
             // Add the corresponding triangles to the mesh
             for (int i = 0; i < numFaces; i++)
             {
                 Face f = faces[i];
                 mesh.Add(new Triangle(vertices[f.v1], vertices[f.v2], vertices[f.v3]));
             }
-
             return mesh;
         }
 
@@ -418,7 +470,12 @@ namespace OpenSim.Region.Physics.Meshing
 
         public IMesh CreateMesh(String primName, PrimitiveBaseShape primShape, PhysicsVector size, float lod, bool isPhysical)
         {
+            // If this mesh has been created already, return it instead of creating another copy
+            // For large regions with 100k+ prims and hundreds of copies of each, this can save a GB or more of memory
+            ulong key = GetMeshKey(primShape, size, lod);
             Mesh mesh = null;
+            if (m_uniqueMeshes.TryGetValue(key, out mesh))
+                return mesh;
 
             if (size.X < 0.01f) size.X = 0.01f;
             if (size.Y < 0.01f) size.Y = 0.01f;
@@ -441,7 +498,7 @@ namespace OpenSim.Region.Physics.Meshing
                 // trim the vertex and triangle lists to free up memory
                 mesh.TrimExcess();
             }
-
+            m_uniqueMeshes.Add(key, mesh);
             return mesh;
         }
     }