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btDbvtBroadphase.cpp

/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2007 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.
*/
///btDbvtBroadphase implementation by Nathanael Presson

#include "btDbvtBroadphase.h"

//
// Profiling
//

#if DBVT_BP_PROFILE||DBVT_BP_ENABLE_BENCHMARK
#include <stdio.h>
#endif

#if DBVT_BP_PROFILE
struct      ProfileScope
      {
      __forceinline ProfileScope(btClock& clock,unsigned long& value) :
            m_clock(&clock),m_value(&value),m_base(clock.getTimeMicroseconds())
            {
            }
      __forceinline ~ProfileScope()
            {
            (*m_value)+=m_clock->getTimeMicroseconds()-m_base;
            }
      btClock*          m_clock;
      unsigned long*    m_value;
      unsigned long     m_base;
      };
#define     SPC(_value_)      ProfileScope      spc_scope(m_clock,_value_)
#else
#define     SPC(_value_)
#endif

//
// Helpers
//

//
template <typename T>
static inline void      listappend(T* item,T*& list)
{
item->links[0]=0;
item->links[1]=list;
if(list) list->links[0]=item;
list=item;
}

//
template <typename T>
static inline void      listremove(T* item,T*& list)
{
if(item->links[0]) item->links[0]->links[1]=item->links[1]; else list=item->links[1];
if(item->links[1]) item->links[1]->links[0]=item->links[0];
}

//
template <typename T>
static inline int listcount(T* root)
{
int   n=0;
while(root) { ++n;root=root->links[1]; }
return(n);
}

//
template <typename T>
static inline void      clear(T& value)
{
static const struct ZeroDummy : T {} zerodummy;
value=zerodummy;
}

//
// Colliders
//

/* Tree collider  */ 
struct      btDbvtTreeCollider : btDbvt::ICollide
{
btDbvtBroadphase* pbp;
btDbvtProxy*            proxy;
            btDbvtTreeCollider(btDbvtBroadphase* p) : pbp(p) {}
void  Process(const btDbvtNode* na,const btDbvtNode* nb)
      {
      if(na!=nb)
            {
            btDbvtProxy*      pa=(btDbvtProxy*)na->data;
            btDbvtProxy*      pb=(btDbvtProxy*)nb->data;
            #if DBVT_BP_SORTPAIRS
            if(pa>pb) btSwap(pa,pb);
            #endif
            pbp->m_paircache->addOverlappingPair(pa,pb);
            ++pbp->m_newpairs;
            }
      }
void  Process(const btDbvtNode* n)
      {
      Process(n,proxy->leaf);
      }
};

//
// btDbvtBroadphase
//

//
btDbvtBroadphase::btDbvtBroadphase(btOverlappingPairCache* paircache)
{
m_deferedcollide  =     false;
m_needcleanup           =     true;
m_releasepaircache      =     (paircache!=0)?false:true;
m_prediction            =     1/(btScalar)2;
m_stageCurrent          =     0;
m_fixedleft             =     0;
m_fupdates              =     1;
m_dupdates              =     0;
m_cupdates              =     10;
m_newpairs              =     1;
m_updates_call          =     0;
m_updates_done          =     0;
m_updates_ratio         =     0;
m_paircache             =     paircache?
                                    paircache   :
                                    new(btAlignedAlloc(sizeof(btHashedOverlappingPairCache),16)) btHashedOverlappingPairCache();
m_gid                   =     0;
m_pid                   =     0;
m_cid                   =     0;
for(int i=0;i<=STAGECOUNT;++i)
      {
      m_stageRoots[i]=0;
      }
#if DBVT_BP_PROFILE
clear(m_profiling);
#endif
}

//
btDbvtBroadphase::~btDbvtBroadphase()
{
if(m_releasepaircache) 
{
      m_paircache->~btOverlappingPairCache();
      btAlignedFree(m_paircache);
}
}

//
btBroadphaseProxy*                        btDbvtBroadphase::createProxy(      const btVector3& aabbMin,
                                                                                                const btVector3& aabbMax,
                                                                                                int /*shapeType*/,
                                                                                                void* userPtr,
                                                                                                short int collisionFilterGroup,
                                                                                                short int collisionFilterMask,
                                                                                                btDispatcher* /*dispatcher*/,
                                                                                                void* /*multiSapProxy*/)
{
btDbvtProxy*            proxy=new(btAlignedAlloc(sizeof(btDbvtProxy),16)) btDbvtProxy(    userPtr,
                                                                                                                              collisionFilterGroup,
                                                                                                                              collisionFilterMask);
proxy->aabb             =     btDbvtVolume::FromMM(aabbMin,aabbMax);
proxy->stage            =     m_stageCurrent;
proxy->m_uniqueId =     ++m_gid;
proxy->leaf             =     m_sets[0].insert(proxy->aabb,proxy);
listappend(proxy,m_stageRoots[m_stageCurrent]);
if(!m_deferedcollide)
      {
      btDbvtTreeCollider      collider(this);
      collider.proxy=proxy;
      btDbvt::collideTV(m_sets[0].m_root,proxy->aabb,collider);
      btDbvt::collideTV(m_sets[1].m_root,proxy->aabb,collider);
      }
return(proxy);
}

//
void                                      btDbvtBroadphase::destroyProxy(     btBroadphaseProxy* absproxy,
                                                                                                btDispatcher* dispatcher)
{
btDbvtProxy*      proxy=(btDbvtProxy*)absproxy;
if(proxy->stage==STAGECOUNT)
      m_sets[1].remove(proxy->leaf);
      else
      m_sets[0].remove(proxy->leaf);
listremove(proxy,m_stageRoots[proxy->stage]);
m_paircache->removeOverlappingPairsContainingProxy(proxy,dispatcher);
btAlignedFree(proxy);
m_needcleanup=true;
}

//
void                                      btDbvtBroadphase::setAabb(          btBroadphaseProxy* absproxy,
                                                                                                const btVector3& aabbMin,
                                                                                                const btVector3& aabbMax,
                                                                                                btDispatcher* /*dispatcher*/)
{
btDbvtProxy*                                    proxy=(btDbvtProxy*)absproxy;
ATTRIBUTE_ALIGNED16(btDbvtVolume)   aabb=btDbvtVolume::FromMM(aabbMin,aabbMax);
#if DBVT_BP_PREVENTFALSEUPDATE
if(NotEqual(aabb,proxy->leaf->volume))
#endif
      {
      bool  docollide=false;
      if(proxy->stage==STAGECOUNT)
            {/* fixed -> dynamic set      */ 
            m_sets[1].remove(proxy->leaf);
            proxy->leaf=m_sets[0].insert(aabb,proxy);
            docollide=true;
            }
            else
            {/* dynamic set                     */ 
            ++m_updates_call;
            if(Intersect(proxy->leaf->volume,aabb))
                  {/* Moving                    */ 
                  const btVector3   delta=aabbMin-proxy->aabb.Mins();
                  btVector3         velocity(aabb.Extents()*m_prediction);
                  if(delta[0]<0) velocity[0]=-velocity[0];
                  if(delta[1]<0) velocity[1]=-velocity[1];
                  if(delta[2]<0) velocity[2]=-velocity[2];
                  if    (
                        #ifdef DBVT_BP_MARGIN                     
                        m_sets[0].update(proxy->leaf,aabb,velocity,DBVT_BP_MARGIN)
                        #else
                        m_sets[0].update(proxy->leaf,aabb,velocity)
                        #endif
                        )
                        {
                        ++m_updates_done;
                        docollide=true;
                        }
                  }
                  else
                  {/* Teleporting               */ 
                  m_sets[0].update(proxy->leaf,aabb);
                  ++m_updates_done;
                  docollide=true;
                  }     
            }
      listremove(proxy,m_stageRoots[proxy->stage]);
      proxy->aabb       =     aabb;
      proxy->stage      =     m_stageCurrent;
      listappend(proxy,m_stageRoots[m_stageCurrent]);
      if(docollide)
            {
            m_needcleanup=true;
            if(!m_deferedcollide)
                  {
                  btDbvtTreeCollider      collider(this);
                  btDbvt::collideTT(m_sets[1].m_root,proxy->leaf,collider);
                  btDbvt::collideTT(m_sets[0].m_root,proxy->leaf,collider);
                  }
            }     
      }
}

//
00269 void                                      btDbvtBroadphase::calculateOverlappingPairs(btDispatcher* dispatcher)
{
collide(dispatcher);
#if DBVT_BP_PROFILE
if(0==(m_pid%DBVT_BP_PROFILING_RATE))
      {     
      printf("fixed(%u) dynamics(%u) pairs(%u)\r\n",m_sets[1].m_leaves,m_sets[0].m_leaves,m_paircache->getNumOverlappingPairs());
      unsigned int      total=m_profiling.m_total;
      if(total<=0) total=1;
      printf("ddcollide: %u%% (%uus)\r\n",(50+m_profiling.m_ddcollide*100)/total,m_profiling.m_ddcollide/DBVT_BP_PROFILING_RATE);
      printf("fdcollide: %u%% (%uus)\r\n",(50+m_profiling.m_fdcollide*100)/total,m_profiling.m_fdcollide/DBVT_BP_PROFILING_RATE);
      printf("cleanup:   %u%% (%uus)\r\n",(50+m_profiling.m_cleanup*100)/total,m_profiling.m_cleanup/DBVT_BP_PROFILING_RATE);
      printf("total:     %uus\r\n",total/DBVT_BP_PROFILING_RATE);
      const unsigned long     sum=m_profiling.m_ddcollide+
                                          m_profiling.m_fdcollide+
                                          m_profiling.m_cleanup;
      printf("leaked: %u%% (%uus)\r\n",100-((50+sum*100)/total),(total-sum)/DBVT_BP_PROFILING_RATE);
      printf("job counts: %u%%\r\n",(m_profiling.m_jobcount*100)/((m_sets[0].m_leaves+m_sets[1].m_leaves)*DBVT_BP_PROFILING_RATE));
      clear(m_profiling);
      m_clock.reset();
      }
#endif
}

//
void                                      btDbvtBroadphase::collide(btDispatcher* dispatcher)
{
SPC(m_profiling.m_total);
/* optimize                   */ 
m_sets[0].optimizeIncremental(1+(m_sets[0].m_leaves*m_dupdates)/100);
if(m_fixedleft)
      {
      const int count=1+(m_sets[1].m_leaves*m_fupdates)/100;
      m_sets[1].optimizeIncremental(1+(m_sets[1].m_leaves*m_fupdates)/100);
      m_fixedleft=btMax<int>(0,m_fixedleft-count);
      }
/* dynamic -> fixed set */ 
m_stageCurrent=(m_stageCurrent+1)%STAGECOUNT;
btDbvtProxy*      current=m_stageRoots[m_stageCurrent];
if(current)
      {
      btDbvtTreeCollider      collider(this);
      do    {
            btDbvtProxy*      next=current->links[1];
            listremove(current,m_stageRoots[current->stage]);
            listappend(current,m_stageRoots[STAGECOUNT]);
            #if DBVT_BP_ACCURATESLEEPING
            m_paircache->removeOverlappingPairsContainingProxy(current,dispatcher);
            collider.proxy=current;
            btDbvt::collideTV(m_sets[0].m_root,current->aabb,collider);
            btDbvt::collideTV(m_sets[1].m_root,current->aabb,collider);
            #endif
            m_sets[0].remove(current->leaf);
            current->leaf     =     m_sets[1].insert(current->aabb,current);
            current->stage    =     STAGECOUNT; 
            current                 =     next;
            } while(current);
      m_fixedleft=m_sets[1].m_leaves;
      m_needcleanup=true;
      }
/* collide dynamics           */ 
      {
      btDbvtTreeCollider      collider(this);
      if(m_deferedcollide)
            {
            SPC(m_profiling.m_fdcollide);
            btDbvt::collideTT(m_sets[0].m_root,m_sets[1].m_root,collider);
            }
      if(m_deferedcollide)
            {
            SPC(m_profiling.m_ddcollide);
            btDbvt::collideTT(m_sets[0].m_root,m_sets[0].m_root,collider);
            }
      }
/* clean up                   */ 
if(m_needcleanup)
      {
      SPC(m_profiling.m_cleanup);
      btBroadphasePairArray&  pairs=m_paircache->getOverlappingPairArray();
      if(pairs.size()>0)
            {
            const int   ci=pairs.size();
            int               ni=btMin(ci,btMax<int>(m_newpairs,(ci*m_cupdates)/100));
            for(int i=0;i<ni;++i)
                  {
                  btBroadphasePair& p=pairs[(m_cid+i)%ci];
                  btDbvtProxy*            pa=(btDbvtProxy*)p.m_pProxy0;
                  btDbvtProxy*            pb=(btDbvtProxy*)p.m_pProxy1;
                  if(!Intersect(pa->leaf->volume,pb->leaf->volume))
                        {
                        #if DBVT_BP_SORTPAIRS
                        if(pa>pb) btSwap(pa,pb);
                        #endif
                        m_paircache->removeOverlappingPair(pa,pb,dispatcher);
                        --ni;--i;
                        }
                  }
            if(pairs.size()>0) m_cid=(m_cid+ni)%pairs.size(); else m_cid=0;
            }
      }
++m_pid;
m_newpairs=1;
m_needcleanup=false;
if(m_updates_call>0)
      { m_updates_ratio=m_updates_done/(btScalar)m_updates_call; }
      else
      { m_updates_ratio=0; }
m_updates_done/=2;
m_updates_call/=2;
}

//
void                                      btDbvtBroadphase::optimize()
{
m_sets[0].optimizeTopDown();
m_sets[1].optimizeTopDown();
}

//
btOverlappingPairCache*             btDbvtBroadphase::getOverlappingPairCache()
{
return(m_paircache);
}

//
const btOverlappingPairCache* btDbvtBroadphase::getOverlappingPairCache() const
{
return(m_paircache);
}

//
00400 void                                      btDbvtBroadphase::getBroadphaseAabb(btVector3& aabbMin,btVector3& aabbMax) const
{

      ATTRIBUTE_ALIGNED16(btDbvtVolume)   bounds;

if(!m_sets[0].empty())
      if(!m_sets[1].empty())  Merge(      m_sets[0].m_root->volume,
                                                      m_sets[1].m_root->volume,bounds);
                                          else
                                          bounds=m_sets[0].m_root->volume;
else if(!m_sets[1].empty())   bounds=m_sets[1].m_root->volume;
                                          else
                                          bounds=btDbvtVolume::FromCR(btVector3(0,0,0),0);
aabbMin=bounds.Mins();
aabbMax=bounds.Maxs();
}

//
void                                      btDbvtBroadphase::printStats()
{}

//
#if DBVT_BP_ENABLE_BENCHMARK

struct      btBroadphaseBenchmark
      {
      struct      Experiment
            {
            const char*             name;
            int                           object_count;
            int                           update_count;
            int                           spawn_count;
            int                           iterations;
            btScalar                speed;
            btScalar                amplitude;
            };
      struct      Object
            {
            btVector3               center;
            btVector3               extents;
            btBroadphaseProxy*      proxy;
            btScalar                time;
            void                    update(btScalar speed,btScalar amplitude,btBroadphaseInterface* pbi)
                  {
                  time        +=    speed;
                  center[0]   =     btCos(time*(btScalar)2.17)*amplitude+
                                          btSin(time)*amplitude/2;
                  center[1]   =     btCos(time*(btScalar)1.38)*amplitude+
                                          btSin(time)*amplitude;
                  center[2]   =     btSin(time*(btScalar)0.777)*amplitude;
                  pbi->setAabb(proxy,center-extents,center+extents,0);
                  }
            };
      static int        UnsignedRand(int range=RAND_MAX-1)  { return(rand()%(range+1)); }
      static btScalar   UnitRand()                                      { return(UnsignedRand(16384)/(btScalar)16384); }
      static void       OutputTime(const char* name,btClock& c,unsigned count=0)
            {
            const unsigned long     us=c.getTimeMicroseconds();
            const unsigned long     ms=(us+500)/1000;
            const btScalar          sec=us/(btScalar)(1000*1000);
            if(count>0)
                  printf("%s : %u us (%u ms), %.2f/s\r\n",name,us,ms,count/sec);
                  else
                  printf("%s : %u us (%u ms)\r\n",name,us,ms);
            }
      };

void                                      btDbvtBroadphase::benchmark(btBroadphaseInterface* pbi)
{
static const btBroadphaseBenchmark::Experiment        experiments[]=
      {
      {"1024o.10%",1024,10,0,8192,(btScalar)0.005,(btScalar)100},
      /*{"4096o.10%",4096,10,0,8192,(btScalar)0.005,(btScalar)100},
      {"8192o.10%",8192,10,0,8192,(btScalar)0.005,(btScalar)100},*/
      };
static const int                                                        nexperiments=sizeof(experiments)/sizeof(experiments[0]);
btAlignedObjectArray<btBroadphaseBenchmark::Object*>  objects;
btClock                                                                             wallclock;
/* Begin                */ 
for(int iexp=0;iexp<nexperiments;++iexp)
      {
      const btBroadphaseBenchmark::Experiment&  experiment=experiments[iexp];
      const int                                                   object_count=experiment.object_count;
      const int                                                   update_count=(object_count*experiment.update_count)/100;
      const int                                                   spawn_count=(object_count*experiment.spawn_count)/100;
      const btScalar                                              speed=experiment.speed; 
      const btScalar                                              amplitude=experiment.amplitude;
      printf("Experiment #%u '%s':\r\n",iexp,experiment.name);
      printf("\tObjects: %u\r\n",object_count);
      printf("\tUpdate: %u\r\n",update_count);
      printf("\tSpawn: %u\r\n",spawn_count);
      printf("\tSpeed: %f\r\n",speed);
      printf("\tAmplitude: %f\r\n",amplitude);
      srand(180673);
      /* Create objects */ 
      wallclock.reset();
      objects.reserve(object_count);
      for(int i=0;i<object_count;++i)
            {
            btBroadphaseBenchmark::Object*      po=new btBroadphaseBenchmark::Object();
            po->center[0]=btBroadphaseBenchmark::UnitRand()*50;
            po->center[1]=btBroadphaseBenchmark::UnitRand()*50;
            po->center[2]=btBroadphaseBenchmark::UnitRand()*50;
            po->extents[0]=btBroadphaseBenchmark::UnitRand()*2+2;
            po->extents[1]=btBroadphaseBenchmark::UnitRand()*2+2;
            po->extents[2]=btBroadphaseBenchmark::UnitRand()*2+2;
            po->time=btBroadphaseBenchmark::UnitRand()*2000;
            po->proxy=pbi->createProxy(po->center-po->extents,po->center+po->extents,0,po,1,1,0,0);
            objects.push_back(po);
            }
      btBroadphaseBenchmark::OutputTime("\tInitialization",wallclock);
      /* First update         */ 
      wallclock.reset();
      for(int i=0;i<objects.size();++i)
            {
            objects[i]->update(speed,amplitude,pbi);
            }
      btBroadphaseBenchmark::OutputTime("\tFirst update",wallclock);
      /* Updates              */ 
      wallclock.reset();
      for(int i=0;i<experiment.iterations;++i)
            {
            for(int j=0;j<update_count;++j)
                  {                       
                  objects[j]->update(speed,amplitude,pbi);
                  }
            pbi->calculateOverlappingPairs(0);
            }
      btBroadphaseBenchmark::OutputTime("\tUpdate",wallclock,experiment.iterations);
      /* Clean up             */ 
      wallclock.reset();
      for(int i=0;i<objects.size();++i)
            {
            pbi->destroyProxy(objects[i]->proxy,0);
            delete objects[i];
            }
      objects.resize(0);
      btBroadphaseBenchmark::OutputTime("\tRelease",wallclock);
      }

}
#else
void                                      btDbvtBroadphase::benchmark(btBroadphaseInterface*)
{}
#endif

#if DBVT_BP_PROFILE
#undef      SPC
#endif

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