make btHashMap data protected (not private) for easier serialization

move btTriangleInfoMap.h into its own header, into the BulletCollision/CollisionShapes folder
add btTriangleInfoMap pointer to btBvhTriangleMeshShape, so we don't need to use the 'userpointer' anymore
preparation for serialization of btTriangleInfoMap.

See also http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=9&t=4603&start=30

src/BulletCollision/CollisionShapes/btTriangleInfoMap.h

@@ -0,0 +1,124 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2010 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_TRIANGLE_INFO_MAP_H
+#define _BT_TRIANGLE_INFO_MAP_H
+
+
+#include "LinearMath/btHashMap.h"
+#include "LinearMath/btSerializer.h"
+
+
+///for btTriangleInfo m_flags
+#define TRI_INFO_V0V1_CONVEX 1
+#define TRI_INFO_V1V2_CONVEX 2
+#define TRI_INFO_V2V0_CONVEX 4
+
+#define TRI_INFO_V0V1_SWAP_NORMALB 8
+#define TRI_INFO_V1V2_SWAP_NORMALB 16
+#define TRI_INFO_V2V0_SWAP_NORMALB 32
+
+
+///The btTriangleInfo structure stores information to adjust collision normals to avoid collisions against internal edges
+///it can be generated using 
+struct	btTriangleInfo
+{
+	btTriangleInfo()
+	{
+		m_edgeV0V1Angle = SIMD_2_PI;
+		m_edgeV1V2Angle = SIMD_2_PI;
+		m_edgeV2V0Angle = SIMD_2_PI;
+		m_flags=0;
+	}
+
+	int			m_flags;
+
+	btScalar	m_edgeV0V1Angle;
+	btScalar	m_edgeV1V2Angle;
+	btScalar	m_edgeV2V0Angle;
+
+};
+
+typedef btHashMap<btHashInt,btTriangleInfo> btInternalTriangleInfoMap;
+
+
+///The btTriangleInfoMap stores edge angle information for some triangles. You can compute this information yourself or using btGenerateInternalEdgeInfo.
+struct	btTriangleInfoMap : public btInternalTriangleInfoMap
+{
+	btScalar	m_convexEpsilon;///used to determine if an edge or contact normal is convex, using the dot product
+	btScalar	m_planarEpsilon; ///used to determine if a triangle edge is planar with zero angle
+	btScalar	m_equalVertexThreshold; ///used to compute connectivity: if the distance between two vertices is smaller than m_equalVertexThreshold, they are considered to be 'shared'
+	btScalar	m_edgeDistanceThreshold; ///used to determine edge contacts: if the closest distance between a contact point and an edge is smaller than this distance threshold it is considered to "hit the edge"
+	btScalar	m_zeroAreaThreshold; ///used to determine if a triangle is degenerate (length squared of cross product of 2 triangle edges < threshold)
+	
+	
+	btTriangleInfoMap()
+	{
+		m_convexEpsilon = 0.00f;
+		m_planarEpsilon = 0.0001f;
+		m_equalVertexThreshold = btScalar(0.0001)*btScalar(0.0001);
+		m_edgeDistanceThreshold = btScalar(0.1);
+		m_zeroAreaThreshold = btScalar(0.0001)*btScalar(0.0001);
+	}
+
+	virtual	int	calculateSerializeBufferSize() const;
+
+	///fills the dataBuffer and returns the struct name (and 0 on failure)
+	virtual	const char*	serialize(void* dataBuffer, btSerializer* serializer) const;
+
+};
+
+struct	btTriangleInfoData
+{
+	int			m_flags;
+	float	m_edgeV0V1Angle;
+	float	m_edgeV1V2Angle;
+	float	m_edgeV2V0Angle;
+};
+
+struct	btTriangleInfoMapData
+{
+	float	m_convexEpsilon;
+	float	m_planarEpsilon;
+	float	m_equalVertexThreshold; 
+	float	m_edgeDistanceThreshold;
+	float	m_zeroAreaThreshold;
+
+	int		m_hashTableSize;
+	int		*m_hashTablePtr;
+	int		m_nextSize;
+	int		*m_nextPtr;
+
+	int		m_numValues;
+	btTriangleInfoData	*m_valueArrayPtr;
+	int		m_numKeys;
+	int		*m_keyArrayPtr;
+
+};
+
+SIMD_FORCE_INLINE	int	btTriangleInfoMap::calculateSerializeBufferSize() const
+{
+	return sizeof(btTriangleInfoMapData);
+}
+
+	///fills the dataBuffer and returns the struct name (and 0 on failure)
+SIMD_FORCE_INLINE	const char*	btTriangleInfoMap::serialize(void* dataBuffer, btSerializer* serializer) const
+{
+	///todo
+	return 0;
+}
+
+
+#endif //_BT_TRIANGLE_INFO_MAP_H