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-/*
-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_SIMULATION_ISLAND_MANAGER_MT_H
-#define BT_SIMULATION_ISLAND_MANAGER_MT_H
-
-#include "BulletCollision/CollisionDispatch/btSimulationIslandManager.h"
-
-class btTypedConstraint;
-
-
-///
-/// SimulationIslandManagerMt -- Multithread capable version of SimulationIslandManager
-/// Splits the world up into islands which can be solved in parallel.
-/// In order to solve islands in parallel, an IslandDispatch function
-/// must be provided which will dispatch calls to multiple threads.
-/// The amount of parallelism that can be achieved depends on the number
-/// of islands. If only a single island exists, then no parallelism is
-/// possible.
-///
-class btSimulationIslandManagerMt : public btSimulationIslandManager
-{
-public:
- struct Island
- {
- // a simulation island consisting of bodies, manifolds and constraints,
- // to be passed into a constraint solver.
- btAlignedObjectArray<btCollisionObject*> bodyArray;
- btAlignedObjectArray<btPersistentManifold*> manifoldArray;
- btAlignedObjectArray<btTypedConstraint*> constraintArray;
- int id; // island id
- bool isSleeping;
-
- void append( const Island& other ); // add bodies, manifolds, constraints to my own
- };
- struct IslandCallback
- {
- virtual ~IslandCallback() {};
-
- virtual void processIsland( btCollisionObject** bodies,
- int numBodies,
- btPersistentManifold** manifolds,
- int numManifolds,
- btTypedConstraint** constraints,
- int numConstraints,
- int islandId
- ) = 0;
- };
- typedef void( *IslandDispatchFunc ) ( btAlignedObjectArray<Island*>* islands, IslandCallback* callback );
- static void serialIslandDispatch( btAlignedObjectArray<Island*>* islandsPtr, IslandCallback* callback );
- static void parallelIslandDispatch( btAlignedObjectArray<Island*>* islandsPtr, IslandCallback* callback );
-protected:
- btAlignedObjectArray<Island*> m_allocatedIslands; // owner of all Islands
- btAlignedObjectArray<Island*> m_activeIslands; // islands actively in use
- btAlignedObjectArray<Island*> m_freeIslands; // islands ready to be reused
- btAlignedObjectArray<Island*> m_lookupIslandFromId; // big lookup table to map islandId to Island pointer
- Island* m_batchIsland;
- int m_minimumSolverBatchSize;
- int m_batchIslandMinBodyCount;
- IslandDispatchFunc m_islandDispatch;
-
- Island* getIsland( int id );
- virtual Island* allocateIsland( int id, int numBodies );
- virtual void initIslandPools();
- virtual void addBodiesToIslands( btCollisionWorld* collisionWorld );
- virtual void addManifoldsToIslands( btDispatcher* dispatcher );
- virtual void addConstraintsToIslands( btAlignedObjectArray<btTypedConstraint*>& constraints );
- virtual void mergeIslands();
-
-public:
- btSimulationIslandManagerMt();
- virtual ~btSimulationIslandManagerMt();
-
- virtual void buildAndProcessIslands( btDispatcher* dispatcher, btCollisionWorld* collisionWorld, btAlignedObjectArray<btTypedConstraint*>& constraints, IslandCallback* callback );
-
- virtual void buildIslands(btDispatcher* dispatcher,btCollisionWorld* colWorld);
-
- int getMinimumSolverBatchSize() const
- {
- return m_minimumSolverBatchSize;
- }
- void setMinimumSolverBatchSize( int sz )
- {
- m_minimumSolverBatchSize = sz;
- }
- IslandDispatchFunc getIslandDispatchFunction() const
- {
- return m_islandDispatch;
- }
- // allow users to set their own dispatch function for multithreaded dispatch
- void setIslandDispatchFunction( IslandDispatchFunc func )
- {
- m_islandDispatch = func;
- }
-};
-
-#endif //BT_SIMULATION_ISLAND_MANAGER_H
-