Merge pull request #246 from erwincoumans/master

add btInMemorySerializer (experiments, allows for in-memory deep copy of...

src/BulletCollision/CMakeLists.txt

@@ -18,6 +18,7 @@ SET(BulletCollision_SRCS
 	CollisionDispatch/btCollisionDispatcher.cpp
 	CollisionDispatch/btCollisionObject.cpp
 	CollisionDispatch/btCollisionWorld.cpp
+	CollisionDispatch/btCollisionWorldImporter.cpp
 	CollisionDispatch/btCompoundCollisionAlgorithm.cpp
 	CollisionDispatch/btCompoundCompoundCollisionAlgorithm.cpp
 	CollisionDispatch/btConvexConcaveCollisionAlgorithm.cpp
@@ -126,6 +127,7 @@ SET(CollisionDispatch_HDRS
 	CollisionDispatch/btCollisionObject.h
 	CollisionDispatch/btCollisionObjectWrapper.h
 	CollisionDispatch/btCollisionWorld.h
+	CollisionDispatch/btCollisionWorldImporter.h
 	CollisionDispatch/btCompoundCollisionAlgorithm.h
 	CollisionDispatch/btCompoundCompoundCollisionAlgorithm.h
 	CollisionDispatch/btConvexConcaveCollisionAlgorithm.h

src/BulletCollision/CollisionDispatch/btCollisionWorldImporter.h

@@ -0,0 +1,190 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2014 Erwin Coumans  http://bulletphysics.org
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it freely,
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+
+#ifndef BT_COLLISION_WORLD_IMPORTER_H
+#define BT_COLLISION_WORLD_IMPORTER_H
+
+#include "LinearMath/btTransform.h"
+#include "LinearMath/btVector3.h"
+#include "LinearMath/btAlignedObjectArray.h"
+#include "LinearMath/btHashMap.h"
+
+class btCollisionShape;
+class btCollisionObject;
+class btBulletSerializedArrays;
+
+
+struct ConstraintInput;
+class btCollisionWorld;
+struct btCollisionShapeData;
+class btTriangleIndexVertexArray;
+class btStridingMeshInterface;
+struct btStridingMeshInterfaceData;
+class btGImpactMeshShape;
+class btOptimizedBvh;
+struct btTriangleInfoMap;
+class btBvhTriangleMeshShape;
+class btPoint2PointConstraint;
+class btHingeConstraint;
+class btConeTwistConstraint;
+class btGeneric6DofConstraint;
+class btGeneric6DofSpringConstraint;
+class btSliderConstraint;
+class btGearConstraint;
+struct btContactSolverInfo;
+
+
+
+
+class btCollisionWorldImporter
+{
+protected:
+	btCollisionWorld* m_collisionWorld;
+
+	int m_verboseMode;
+
+	btAlignedObjectArray<btCollisionShape*>  m_allocatedCollisionShapes;
+	btAlignedObjectArray<btCollisionObject*> m_allocatedRigidBodies;
+
+	btAlignedObjectArray<btOptimizedBvh*>	 m_allocatedBvhs;
+	btAlignedObjectArray<btTriangleInfoMap*> m_allocatedTriangleInfoMaps;
+	btAlignedObjectArray<btTriangleIndexVertexArray*> m_allocatedTriangleIndexArrays;
+	btAlignedObjectArray<btStridingMeshInterfaceData*> m_allocatedbtStridingMeshInterfaceDatas;
+	btAlignedObjectArray<btCollisionObject*> m_allocatedCollisionObjects;
+
+
+	btAlignedObjectArray<char*>				m_allocatedNames;
+
+	btAlignedObjectArray<int*>				m_indexArrays;
+	btAlignedObjectArray<short int*>		m_shortIndexArrays;
+	btAlignedObjectArray<unsigned char*>	m_charIndexArrays;
+
+	btAlignedObjectArray<btVector3FloatData*>	m_floatVertexArrays;
+	btAlignedObjectArray<btVector3DoubleData*>	m_doubleVertexArrays;
+
+
+	btHashMap<btHashPtr,btOptimizedBvh*>	m_bvhMap;
+	btHashMap<btHashPtr,btTriangleInfoMap*>	m_timMap;
+
+	btHashMap<btHashString,btCollisionShape*>	m_nameShapeMap;
+	btHashMap<btHashString,btCollisionObject*>	m_nameColObjMap;
+
+	btHashMap<btHashPtr,const char*>	m_objectNameMap;
+
+	btHashMap<btHashPtr,btCollisionShape*>	m_shapeMap;
+	btHashMap<btHashPtr,btCollisionObject*>	m_bodyMap;
+
+
+	//methods
+
+
+
+	char*	duplicateName(const char* name);
+
+	btCollisionShape* convertCollisionShape(  btCollisionShapeData* shapeData  );
+
+
+public:
+
+	btCollisionWorldImporter(btCollisionWorld* world);
+
+	virtual ~btCollisionWorldImporter();
+
+    bool	convertAllObjects( btBulletSerializedArrays* arrays);
+
+		///delete all memory collision shapes, rigid bodies, constraints etc. allocated during the load.
+	///make sure you don't use the dynamics world containing objects after you call this method
+	virtual void deleteAllData();
+
+	void	setVerboseMode(int verboseMode)
+	{
+		m_verboseMode = verboseMode;
+	}
+
+	int getVerboseMode() const
+	{
+		return m_verboseMode;
+	}
+
+		// query for data
+	int	getNumCollisionShapes() const;
+	btCollisionShape* getCollisionShapeByIndex(int index);
+	int getNumRigidBodies() const;
+	btCollisionObject* getRigidBodyByIndex(int index) const;
+	int getNumConstraints() const;
+
+	int getNumBvhs() const;
+	btOptimizedBvh*  getBvhByIndex(int index) const;
+	int getNumTriangleInfoMaps() const;
+	btTriangleInfoMap* getTriangleInfoMapByIndex(int index) const;
+
+	// queris involving named objects
+	btCollisionShape* getCollisionShapeByName(const char* name);
+	btCollisionObject* getCollisionObjectByName(const char* name);
+
+
+	const char*	getNameForPointer(const void* ptr) const;
+
+	///those virtuals are called by load and can be overridden by the user
+
+
+
+	//bodies
+
+	virtual btCollisionObject*  createCollisionObject(	const btTransform& startTransform,	btCollisionShape* shape,const char* bodyName);
+
+	///shapes
+
+	virtual btCollisionShape* createPlaneShape(const btVector3& planeNormal,btScalar planeConstant);
+	virtual btCollisionShape* createBoxShape(const btVector3& halfExtents);
+	virtual btCollisionShape* createSphereShape(btScalar radius);
+	virtual btCollisionShape* createCapsuleShapeX(btScalar radius, btScalar height);
+	virtual btCollisionShape* createCapsuleShapeY(btScalar radius, btScalar height);
+	virtual btCollisionShape* createCapsuleShapeZ(btScalar radius, btScalar height);
+
+	virtual btCollisionShape* createCylinderShapeX(btScalar radius,btScalar height);
+	virtual btCollisionShape* createCylinderShapeY(btScalar radius,btScalar height);
+	virtual btCollisionShape* createCylinderShapeZ(btScalar radius,btScalar height);
+	virtual btCollisionShape* createConeShapeX(btScalar radius,btScalar height);
+	virtual btCollisionShape* createConeShapeY(btScalar radius,btScalar height);
+	virtual btCollisionShape* createConeShapeZ(btScalar radius,btScalar height);
+	virtual class btTriangleIndexVertexArray*	createTriangleMeshContainer();
+	virtual	btBvhTriangleMeshShape* createBvhTriangleMeshShape(btStridingMeshInterface* trimesh, btOptimizedBvh* bvh);
+	virtual btCollisionShape* createConvexTriangleMeshShape(btStridingMeshInterface* trimesh);
+#ifdef SUPPORT_GIMPACT_SHAPE_IMPORT
+	virtual btGImpactMeshShape* createGimpactShape(btStridingMeshInterface* trimesh);
+#endif //SUPPORT_GIMPACT_SHAPE_IMPORT
+	virtual btStridingMeshInterfaceData* createStridingMeshInterfaceData(btStridingMeshInterfaceData* interfaceData);
+
+	virtual class btConvexHullShape* createConvexHullShape();
+	virtual class btCompoundShape* createCompoundShape();
+	virtual class btScaledBvhTriangleMeshShape* createScaledTrangleMeshShape(btBvhTriangleMeshShape* meshShape,const btVector3& localScalingbtBvhTriangleMeshShape);
+
+	virtual class btMultiSphereShape* createMultiSphereShape(const btVector3* positions,const btScalar* radi,int numSpheres);
+
+	virtual btTriangleIndexVertexArray* createMeshInterface(btStridingMeshInterfaceData& meshData);
+
+	///acceleration and connectivity structures
+	virtual btOptimizedBvh*	createOptimizedBvh();
+	virtual btTriangleInfoMap* createTriangleInfoMap();
+
+
+
+
+};
+
+
+#endif //BT_WORLD_IMPORTER_H

src/LinearMath/btSerializer.h

@@ -4,8 +4,8 @@ Copyright (c) 2003-2009 Erwin Coumans  http://bulletphysics.org
 
 This software is provided 'as-is', without any express or implied warranty.
 In no event will the authors be held liable for any damages arising from the use of this software.
-Permission is granted to anyone to use this software for any purpose, 
+Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it freely, 
+including commercial applications, and to alter it and redistribute it freely,
 subject to the following restrictions:
 
 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
@@ -32,12 +32,12 @@ extern int sBulletDNAlen;
 extern char sBulletDNAstr64[];
 extern int sBulletDNAlen64;
 
-SIMD_FORCE_INLINE	int btStrLen(const char* str) 
+SIMD_FORCE_INLINE	int btStrLen(const char* str)
 {
-    if (!str) 
+    if (!str)
 		return(0);
 	int len = 0;
-    
+
 	while (*str != 0)
 	{
         str++;
@@ -85,7 +85,7 @@ public:
 	virtual	void*	getUniquePointer(void*oldPtr) = 0;
 
 	virtual	void	startSerialization() = 0;
-	
+
 	virtual	void	finishSerialization() = 0;
 
 	virtual	const char*	findNameForPointer(const void* ptr) const = 0;
@@ -149,12 +149,13 @@ struct btBulletSerializedArrays
 	btAlignedObjectArray<struct btDynamicsWorldFloatData*> m_dynamicWorldInfoDataFloat;
 	btAlignedObjectArray<struct btRigidBodyDoubleData*> m_rigidBodyDataDouble;
 	btAlignedObjectArray<struct btRigidBodyFloatData*> m_rigidBodyDataFloat;
-	btAlignedObjectArray<struct btCollisionObjectDoubleData*> m_collisionDataDouble;
+	btAlignedObjectArray<struct btCollisionObjectDoubleData*> m_collisionObjectDataDouble;
-	btAlignedObjectArray<struct btCollisionObjectFloatData*> m_collisionDataFloat;
+	btAlignedObjectArray<struct btCollisionObjectFloatData*> m_collisionObjectDataFloat;
 	btAlignedObjectArray<struct btTypedConstraintFloatData*> m_constraintDataFloat;
 	btAlignedObjectArray<struct btTypedConstraintDoubleData*> m_constraintDataDouble;
 	btAlignedObjectArray<struct btTypedConstraintData*> m_constraintData;//for backwards compatibility
-	
+	btAlignedObjectArray<struct btSoftBodyFloatData*> m_softBodyFloatData;
+	btAlignedObjectArray<struct btSoftBodyDoubleData*> m_softBodyDoubleData;
 
 };
 
@@ -172,9 +173,9 @@ protected:
 	btHashMap<btHashInt, int>			mStructReverse;
 	btHashMap<btHashString,int>	mTypeLookup;
 
-	
+
 	btHashMap<btHashPtr,void*>	m_chunkP;
-	
+
 	btHashMap<btHashPtr,const char*>	m_nameMap;
 
 	btHashMap<btHashPtr,btPointerUid>	m_uniquePointers;
@@ -190,10 +191,10 @@ protected:
 
 
 	btAlignedObjectArray<btChunk*>	m_chunkPtrs;
-	
+
 protected:
 
-	virtual	void*	findPointer(void* oldPtr) 
+	virtual	void*	findPointer(void* oldPtr)
 	{
 		void** ptr = m_chunkP.find(oldPtr);
 		if (ptr && *ptr)
@@ -201,7 +202,7 @@ protected:
 		return 0;
 	}
 
-	
+
 
 
 
@@ -219,7 +220,7 @@ protected:
 			const int* valuePtr = mTypeLookup.find(key);
 			if (valuePtr)
 				return *valuePtr;
-			
+
 			return -1;
 		}
 
@@ -231,7 +232,7 @@ protected:
 
 			int littleEndian= 1;
 			littleEndian= ((char*)&littleEndian)[0];
-			
+
 
 			m_dna = btAlignedAlloc(dnalen,16);
 			memcpy(m_dna,bdnaOrg,dnalen);
@@ -259,16 +260,16 @@ protected:
 			// Parse names
 			if (!littleEndian)
 				*intPtr = btSwapEndian(*intPtr);
-				
+
 			dataLen = *intPtr;
-			
+
 			intPtr++;
 
 			cp = (char*)intPtr;
 			int i;
 			for ( i=0; i<dataLen; i++)
 			{
-				
+
 				while (*cp)cp++;
 				cp++;
 			}
@@ -286,11 +287,11 @@ protected:
 
 			if (!littleEndian)
 				*intPtr =  btSwapEndian(*intPtr);
-			
+
 			dataLen = *intPtr;
 			intPtr++;
 
-			
+
 			cp = (char*)intPtr;
 			for (i=0; i<dataLen; i++)
 			{
@@ -341,7 +342,7 @@ protected:
 
 			if (!littleEndian)
 				*intPtr = btSwapEndian(*intPtr);
-			dataLen = *intPtr ; 
+			dataLen = *intPtr ;
 			intPtr++;
 
 
@@ -349,7 +350,7 @@ protected:
 			for (i=0; i<dataLen; i++)
 			{
 				mStructs.push_back (shtPtr);
-				
+
 				if (!littleEndian)
 				{
 					shtPtr[0]= btSwapEndian(shtPtr[0]);
@@ -379,10 +380,10 @@ protected:
 			}
 		}
 
-public:	
+public:
-	
+
+
 
-	
 
 		btDefaultSerializer(int totalSize=0)
 			:m_totalSize(totalSize),
@@ -392,7 +393,7 @@ public:
 			m_serializationFlags(0)
 		{
 			m_buffer = m_totalSize?(unsigned char*)btAlignedAlloc(totalSize,16):0;
-			
+
 			const bool VOID_IS_8 = ((sizeof(void*)==8));
 
 #ifdef BT_INTERNAL_UPDATE_SERIALIZATION_STRUCTURES
@@ -411,7 +412,7 @@ public:
 				btAssert(0);
 #endif
 			}
-	
+
 #else //BT_INTERNAL_UPDATE_SERIALIZATION_STRUCTURES
 			if (VOID_IS_8)
 			{
@@ -421,10 +422,10 @@ public:
 				initDNA((const char*)sBulletDNAstr,sBulletDNAlen);
 			}
 #endif //BT_INTERNAL_UPDATE_SERIALIZATION_STRUCTURES
-	
+
 		}
 
-		virtual ~btDefaultSerializer() 
+		virtual ~btDefaultSerializer()
 		{
 			if (m_buffer)
 				btAlignedFree(m_buffer);
@@ -434,14 +435,14 @@ public:
 
 		void	writeHeader(unsigned char* buffer) const
 		{
-			
+
 
 #ifdef  BT_USE_DOUBLE_PRECISION
 			memcpy(buffer, "BULLETd", 7);
 #else
 			memcpy(buffer, "BULLETf", 7);
 #endif //BT_USE_DOUBLE_PRECISION
-	
+
 			int littleEndian= 1;
 			littleEndian= ((char*)&littleEndian)[0];
 
@@ -455,7 +456,7 @@ public:
 
 			if (littleEndian)
 			{
-				buffer[8]='v';				
+				buffer[8]='v';
 			} else
 			{
 				buffer[8]='V';
@@ -476,7 +477,7 @@ public:
 				unsigned char* buffer = internalAlloc(BT_HEADER_LENGTH);
 				writeHeader(buffer);
 			}
-			
+
 		}
 
 		virtual	void	finishSerialization()
@@ -529,7 +530,7 @@ public:
 				return uptr->m_ptr;
 			}
 			m_uniqueIdGenerator++;
-			
+
 			btPointerUid uid;
 			uid.m_uniqueIds[0] = m_uniqueIdGenerator;
 			uid.m_uniqueIds[1] = m_uniqueIdGenerator;
@@ -556,17 +557,17 @@ public:
 			}
 
 			chunk->m_dna_nr = getReverseType(structType);
-			
+
 			chunk->m_chunkCode = chunkCode;
-			
+
 			void* uniquePtr = getUniquePointer(oldPtr);
-			
+
 			m_chunkP.insert(oldPtr,uniquePtr);//chunk->m_oldPtr);
 			chunk->m_oldPtr = uniquePtr;//oldPtr;
-			
+
 		}
 
-		
+
 		virtual unsigned char* internalAlloc(size_t size)
 		{
 			unsigned char* ptr = 0;
@@ -584,7 +585,7 @@ public:
 			return ptr;
 		}
 
-		
+
 
 		virtual	btChunk*	allocate(size_t size, int numElements)
 		{
@@ -592,15 +593,15 @@ public:
 			unsigned char* ptr = internalAlloc(int(size)*numElements+sizeof(btChunk));
 
 			unsigned char* data = ptr + sizeof(btChunk);
-			
+
 			btChunk* chunk = (btChunk*)ptr;
 			chunk->m_chunkCode = 0;
 			chunk->m_oldPtr = data;
 			chunk->m_length = int(size)*numElements;
 			chunk->m_number = numElements;
-			
+
 			m_chunkPtrs.push_back(chunk);
-			
+
 
 			return chunk;
 		}
@@ -668,6 +669,180 @@ public:
 		}
 };
 
+///In general it is best to use btDefaultSerializer, 
+///in particular when writing the data to disk or sending it over the network.
+///The btInMemorySerializer is experimental and only suitable in a few cases.
+///The btInMemorySerializer takes a shortcut and can be useful to create a deep-copy
+///of objects. There will be a demo on how to use the btInMemorySerializer.
+struct btInMemorySerializer : public btDefaultSerializer
+{
+    btHashMap<btHashPtr,btChunk*> m_uid2ChunkPtr;
+    btHashMap<btHashPtr,void*> m_orgPtr2UniqueDataPtr;
+    btHashMap<btHashString,const void*> m_names2Ptr;
+    btHashMap<btHashPtr,void*> m_skipPointers;
+
+    btBulletSerializedArrays    m_arrays;
+
+
+    virtual void startSerialization()
+    {
+        m_uid2ChunkPtr.clear();
+        //todo: m_arrays.clear();
+        btDefaultSerializer::startSerialization();
+    }
+
+    btChunk* findChunkFromUniquePointer(void* uniquePointer)
+    {
+        btChunk** chkPtr = m_uid2ChunkPtr[uniquePointer];
+        if (chkPtr)
+        {
+            return *chkPtr;
+        }
+        return 0;
+    }
+
+	virtual	void	registerNameForPointer(const void* ptr, const char* name)
+    {
+       btDefaultSerializer::registerNameForPointer(ptr,name);
+       m_names2Ptr.insert(name,ptr);
+    }
+
+    virtual void finishSerialization()
+    {
+    }
+
+    virtual void* getUniquePointer(void*oldPtr)
+    {
+        if (oldPtr==0)
+            return 0;
+
+        // void* uniquePtr = getUniquePointer(oldPtr);
+        btChunk* chunk = findChunkFromUniquePointer(oldPtr);
+        if (chunk)
+        {
+            return chunk->m_oldPtr;
+        } else
+        {
+            const char* n = (const char*) oldPtr;
+            const void** ptr = m_names2Ptr[n];
+            if (ptr)
+            {
+                return oldPtr;
+            } else
+            {
+            		void** ptr2 = m_skipPointers[oldPtr];
+            		if (ptr2)
+								{
+									return 0;
+								} else
+								{
+									//If this assert hit, serialization happened in the wrong order
+									// 'getUniquePointer'
+									btAssert(0);
+								}
+
+            }
+            return 0;
+        }
+				return oldPtr;
+    }
+
+    virtual void finalizeChunk(btChunk* chunk, const char* structType, int chunkCode,void* oldPtr)
+    {
+        if (!(m_serializationFlags&BT_SERIALIZE_NO_DUPLICATE_ASSERT))
+        {
+            btAssert(!findPointer(oldPtr));
+        }
+
+        chunk->m_dna_nr = getReverseType(structType);
+        chunk->m_chunkCode = chunkCode;
+        //void* uniquePtr = getUniquePointer(oldPtr);
+        m_chunkP.insert(oldPtr,oldPtr);//chunk->m_oldPtr);
+        // chunk->m_oldPtr = uniquePtr;//oldPtr;
+
+        void* uid = findPointer(oldPtr);
+        m_uid2ChunkPtr.insert(uid,chunk);
+
+        switch (chunk->m_chunkCode)
+			{
+			case BT_SOFTBODY_CODE:
+			{
+	#ifdef BT_USE_DOUBLE_PRECISION
+					m_arrays.m_softBodyDoubleData.push_back((btSoftBodyDoubleData*) chunk->m_oldPtr);
+	#else
+					m_arrays.m_softBodyFloatData.push_back((btSoftBodyFloatData*) chunk->m_oldPtr);
+	#endif
+					break;
+				}
+			case BT_COLLISIONOBJECT_CODE:
+				{
+	#ifdef BT_USE_DOUBLE_PRECISION
+					m_arrays.m_collisionObjectDataDouble.push_back((btCollisionObjectDoubleData*)chunk->m_oldPtr);
+	#else//BT_USE_DOUBLE_PRECISION
+					m_arrays.m_collisionObjectDataFloat.push_back((btCollisionObjectFloatData*)chunk->m_oldPtr);
+	#endif //BT_USE_DOUBLE_PRECISION
+					break;
+				}
+			case BT_RIGIDBODY_CODE:
+				{
+	#ifdef BT_USE_DOUBLE_PRECISION
+					m_arrays.m_rigidBodyDataDouble.push_back((btRigidBodyDoubleData*)chunk->m_oldPtr);
+	#else
+					m_arrays.m_rigidBodyDataFloat.push_back((btRigidBodyFloatData*)chunk->m_oldPtr);
+	#endif//BT_USE_DOUBLE_PRECISION
+					break;
+				};
+			case BT_CONSTRAINT_CODE:
+				{
+	#ifdef BT_USE_DOUBLE_PRECISION
+					m_arrays.m_constraintDataDouble.push_back(btTypedConstraintDoubleData*)chunk->m_oldPtr);
+	#else
+					m_arrays.m_constraintDataFloat.push_back((btTypedConstraintFloatData*)chunk->m_oldPtr);
+	#endif
+					break;
+				}
+			case BT_QUANTIZED_BVH_CODE:
+				{
+	#ifdef BT_USE_DOUBLE_PRECISION
+					m_arrays.m_bvhsFloat.push_back((btQuantizedBvhDoubleData*) chunk->m_oldPtr);
+	#else
+					m_arrays.m_bvhsFloat.push_back((btQuantizedBvhFloatData*) chunk->m_oldPtr);
+	#endif
+					break;
+				}
+	
+			case BT_SHAPE_CODE:
+				{
+					btCollisionShapeData* shapeData = (btCollisionShapeData*) chunk->m_oldPtr;
+					m_arrays.m_colShapeData.push_back(shapeData);
+					break;
+				}
+			case BT_TRIANLGE_INFO_MAP:
+			case BT_ARRAY_CODE:
+			case BT_SBMATERIAL_CODE:
+			case BT_SBNODE_CODE:
+			case BT_DYNAMICSWORLD_CODE:
+			case BT_DNA_CODE:
+				{
+					break;
+				}
+			default:
+				{
+				}
+			};
+    }
+
+    int getNumChunks() const
+    {
+        return m_uid2ChunkPtr.size();
+    }
+
+    const btChunk* getChunk(int chunkIndex) const
+    {
+        return *m_uid2ChunkPtr.getAtIndex(chunkIndex);
+    }
+
+};
 
 #endif //BT_SERIALIZER_H