Vendor thirdparty Bullet source for upcoming physics server backend

1 files changed, 164 insertions, 0 deletions

diff --git a/thirdparty/bullet/src/BulletCollision/CollisionDispatch/btCollisionDispatcherMt.cpp b/thirdparty/bullet/src/BulletCollision/CollisionDispatch/btCollisionDispatcherMt.cpp
new file mode 100644
index 0000000000..075860c503
--- /dev/null
+++ b/thirdparty/bullet/src/BulletCollision/CollisionDispatch/btCollisionDispatcherMt.cpp
@@ -0,0 +1,164 @@
+/*
+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.
+*/
+
+
+
+#include "btCollisionDispatcherMt.h"
+#include "LinearMath/btQuickprof.h"
+
+#include "BulletCollision/BroadphaseCollision/btCollisionAlgorithm.h"
+
+#include "BulletCollision/CollisionShapes/btCollisionShape.h"
+#include "BulletCollision/CollisionDispatch/btCollisionObject.h"
+#include "BulletCollision/BroadphaseCollision/btOverlappingPairCache.h"
+#include "LinearMath/btPoolAllocator.h"
+#include "BulletCollision/CollisionDispatch/btCollisionConfiguration.h"
+#include "BulletCollision/CollisionDispatch/btCollisionObjectWrapper.h"
+
+
+btCollisionDispatcherMt::btCollisionDispatcherMt( btCollisionConfiguration* config, int grainSize )
+    : btCollisionDispatcher( config )
+{
+    m_batchUpdating = false;
+    m_grainSize = grainSize;  // iterations per task
+}
+
+
+btPersistentManifold* btCollisionDispatcherMt::getNewManifold( const btCollisionObject* body0, const btCollisionObject* body1 )
+{
+    //optional relative contact breaking threshold, turned on by default (use setDispatcherFlags to switch off feature for improved performance)
+
+    btScalar contactBreakingThreshold = ( m_dispatcherFlags & btCollisionDispatcher::CD_USE_RELATIVE_CONTACT_BREAKING_THRESHOLD ) ?
+        btMin( body0->getCollisionShape()->getContactBreakingThreshold( gContactBreakingThreshold ), body1->getCollisionShape()->getContactBreakingThreshold( gContactBreakingThreshold ) )
+        : gContactBreakingThreshold;
+
+    btScalar contactProcessingThreshold = btMin( body0->getContactProcessingThreshold(), body1->getContactProcessingThreshold() );
+
+    void* mem = m_persistentManifoldPoolAllocator->allocate( sizeof( btPersistentManifold ) );
+    if ( NULL == mem )
+    {
+        //we got a pool memory overflow, by default we fallback to dynamically allocate memory. If we require a contiguous contact pool then assert.
+        if ( ( m_dispatcherFlags&CD_DISABLE_CONTACTPOOL_DYNAMIC_ALLOCATION ) == 0 )
+        {
+            mem = btAlignedAlloc( sizeof( btPersistentManifold ), 16 );
+        }
+        else
+        {
+            btAssert( 0 );
+            //make sure to increase the m_defaultMaxPersistentManifoldPoolSize in the btDefaultCollisionConstructionInfo/btDefaultCollisionConfiguration
+            return 0;
+        }
+    }
+    btPersistentManifold* manifold = new( mem ) btPersistentManifold( body0, body1, 0, contactBreakingThreshold, contactProcessingThreshold );
+    if ( !m_batchUpdating )
+    {
+        // batch updater will update manifold pointers array after finishing, so
+        // only need to update array when not batch-updating
+        //btAssert( !btThreadsAreRunning() );
+        manifold->m_index1a = m_manifoldsPtr.size();
+        m_manifoldsPtr.push_back( manifold );
+    }
+
+    return manifold;
+}
+
+void btCollisionDispatcherMt::releaseManifold( btPersistentManifold* manifold )
+{
+    clearManifold( manifold );
+    //btAssert( !btThreadsAreRunning() );
+    if ( !m_batchUpdating )
+    {
+        // batch updater will update manifold pointers array after finishing, so
+        // only need to update array when not batch-updating
+        int findIndex = manifold->m_index1a;
+        btAssert( findIndex < m_manifoldsPtr.size() );
+        m_manifoldsPtr.swap( findIndex, m_manifoldsPtr.size() - 1 );
+        m_manifoldsPtr[ findIndex ]->m_index1a = findIndex;
+        m_manifoldsPtr.pop_back();
+    }
+
+    manifold->~btPersistentManifold();
+    if ( m_persistentManifoldPoolAllocator->validPtr( manifold ) )
+    {
+        m_persistentManifoldPoolAllocator->freeMemory( manifold );
+    }
+    else
+    {
+        btAlignedFree( manifold );
+    }
+}
+
+struct CollisionDispatcherUpdater : public btIParallelForBody
+{
+    btBroadphasePair* mPairArray;
+    btNearCallback mCallback;
+    btCollisionDispatcher* mDispatcher;
+    const btDispatcherInfo* mInfo;
+
+    CollisionDispatcherUpdater()
+    {
+        mPairArray = NULL;
+        mCallback = NULL;
+        mDispatcher = NULL;
+        mInfo = NULL;
+    }
+    void forLoop( int iBegin, int iEnd ) const
+    {
+        for ( int i = iBegin; i < iEnd; ++i )
+        {
+            btBroadphasePair* pair = &mPairArray[ i ];
+            mCallback( *pair, *mDispatcher, *mInfo );
+        }
+    }
+};
+
+
+void btCollisionDispatcherMt::dispatchAllCollisionPairs( btOverlappingPairCache* pairCache, const btDispatcherInfo& info, btDispatcher* dispatcher )
+{
+    int pairCount = pairCache->getNumOverlappingPairs();
+    if ( pairCount == 0 )
+    {
+        return;
+    }
+    CollisionDispatcherUpdater updater;
+    updater.mCallback = getNearCallback();
+    updater.mPairArray = pairCache->getOverlappingPairArrayPtr();
+    updater.mDispatcher = this;
+    updater.mInfo = &info;
+
+    m_batchUpdating = true;
+    btParallelFor( 0, pairCount, m_grainSize, updater );
+    m_batchUpdating = false;
+
+    // reconstruct the manifolds array to ensure determinism
+    m_manifoldsPtr.resizeNoInitialize( 0 );
+
+    btBroadphasePair* pairs = pairCache->getOverlappingPairArrayPtr();
+    for ( int i = 0; i < pairCount; ++i )
+    {
+        if (btCollisionAlgorithm* algo = pairs[ i ].m_algorithm)
+        {
+            algo->getAllContactManifolds( m_manifoldsPtr );
+        }
+    }
+
+    // update the indices (used when releasing manifolds)
+    for ( int i = 0; i < m_manifoldsPtr.size(); ++i )
+    {
+        m_manifoldsPtr[ i ]->m_index1a = i;
+    }
+}
+
+