fairly large refactoring of dispatcher/simulation island management, to allow for parallel simulation.

Bullet/CollisionDispatch/SimulationIslandManager.h

@@ -0,0 +1,58 @@
+/*
+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 SIMULATION_ISLAND_MANAGER_H
+#define SIMULATION_ISLAND_MANAGER_H
+
+#include "CollisionDispatch/UnionFind.h"
+#include "CollisionCreateFunc.h"
+
+class CollisionWorld;
+class Dispatcher;
+
+///SimulationIslandManager creates and handles simulation islands, using UnionFind
+class SimulationIslandManager
+{
+	UnionFind m_unionFind;
+
+public:
+	SimulationIslandManager();
+
+
+	void InitUnionFind(int n);	
+	
+		
+	UnionFind& GetUnionFind() { return m_unionFind;}
+
+	virtual	void	UpdateActivationState(CollisionWorld* colWorld,Dispatcher* dispatcher);
+	virtual	void	StoreIslandActivationState(CollisionWorld* world);
+
+
+	void	FindUnions(Dispatcher* dispatcher);
+
+	
+
+	struct	IslandCallback
+	{
+		virtual ~IslandCallback() {};
+
+		virtual	void	ProcessIsland(class PersistentManifold**	manifolds,int numManifolds) = 0;
+	};
+
+	void	BuildAndProcessIslands(Dispatcher* dispatcher,CollisionObjectArray& collisionObjects, IslandCallback* callback);
+
+};
+
+#endif //SIMULATION_ISLAND_MANAGER_H