added configuration files for collision detection.

this allows to use different collision algorithms by default, and avoid linkage issues.

src/BulletCollision/CollisionDispatch/btCollisionConfiguration.h

@@ -0,0 +1,53 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+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_CONFIGURATION
+#define BT_COLLISION_CONFIGURATION
+///btCollisionConfiguration allows to configure Bullet collision detection
+///stack allocator size, default collision algorithms and persistent manifold pool size
+///todo: describe the meaning
+class	btCollisionConfiguration
+{
+
+public:
+
+	virtual ~btCollisionConfiguration()
+	{
+	}
+
+	///pool size for the persistent contact manifold
+	virtual int	getMaxPersistentManifoldPoolSize() = 0;
+
+	virtual int	getStackAllocatorSize() = 0;
+
+	virtual int	getCollisionAlgorithmPoolSize() = 0;
+
+	virtual int	getCollisionAlgorithmMaxElementSize() = 0;
+
+	virtual btCollisionAlgorithmCreateFunc* getConvexConvexCollisionCreateFunc() = 0;
+
+	virtual btCollisionAlgorithmCreateFunc* getConvexConcaveCollisionCreateFunc() = 0;
+
+	virtual btCollisionAlgorithmCreateFunc* getSwappedConvexConcaveCollisionCreateFunc() = 0;
+
+	virtual btCollisionAlgorithmCreateFunc* getCompoundCollisionCreateFunc() = 0;
+
+	virtual btCollisionAlgorithmCreateFunc* getSwappedCompoundCollisionCreateFunc() = 0;
+
+	virtual btCollisionAlgorithmCreateFunc* getEmptyCollisionCreateFunc() = 0;
+
+};
+
+#endif //BT_COLLISION_CONFIGURATION