PxCollection* MakePhysXCollection(const TArray<UPhysicalMaterial*>& PhysicalMaterials, const TArray<UBodySetup*>& BodySetups, uint64 BaseId)
{
QUICK_SCOPE_CYCLE_COUNTER(STAT_CreateSharedData);
PxCollection* PCollection = PxCreateCollection();
for (UPhysicalMaterial* PhysicalMaterial : PhysicalMaterials)
{
if (PhysicalMaterial)
{
PCollection->add(*PhysicalMaterial->GetPhysXMaterial());
}
}
for (UBodySetup* BodySetup : BodySetups)
{
for(PxTriangleMesh* TriMesh : BodySetup->TriMeshes)
{
AddToCollection(PCollection, TriMesh);
}
for (const FKConvexElem& ConvexElem : BodySetup->AggGeom.ConvexElems)
{
AddToCollection(PCollection, ConvexElem.ConvexMesh);
AddToCollection(PCollection, ConvexElem.ConvexMeshNegX);
}
}
PxSerialization::createSerialObjectIds(*PCollection, PxSerialObjectId(BaseId));
return PCollection;
}
virtual bool SerializeActors(FName Format, const TArray<FBodyInstance*>& Bodies, const TArray<UBodySetup*>& BodySetups, const TArray<UPhysicalMaterial*>& PhysicalMaterials, TArray<uint8>& OutBuffer) const override
{
#if WITH_PHYSX
PxSerializationRegistry* PRegistry = PxSerialization::createSerializationRegistry(*GPhysXSDK);
PxCollection* PCollection = PxCreateCollection();
PxBase* PLastObject = nullptr;
for(FBodyInstance* BodyInstance : Bodies)
{
if(BodyInstance->RigidActorSync)
{
PCollection->add(*BodyInstance->RigidActorSync, BodyInstance->RigidActorSyncId);
PLastObject = BodyInstance->RigidActorSync;
}
if(BodyInstance->RigidActorAsync)
{
PCollection->add(*BodyInstance->RigidActorAsync, BodyInstance->RigidActorAsyncId);
PLastObject = BodyInstance->RigidActorAsync;
}
}
PxSerialization::createSerialObjectIds(*PCollection, PxSerialObjectId(1)); //we get physx to assign an id for each actor
//Note that rigid bodies may have assigned ids. It's important to let them go first because we rely on that id for deserialization.
//One this is done we must find out the next available ID, and use that for naming the shared resources. We have to save this for deserialization
uint64 BaseId = PLastObject ? (PCollection->getId(*PLastObject) + 1) : 1;
PxCollection* PExceptFor = MakePhysXCollection(PhysicalMaterials, BodySetups, BaseId);
for (FBodyInstance* BodyInstance : Bodies) //and then we mark that id back into the bodyinstance so we can pair the two later
{
if (BodyInstance->RigidActorSync)
{
BodyInstance->RigidActorSyncId = PCollection->getId(*BodyInstance->RigidActorSync);
}
if (BodyInstance->RigidActorAsync)
{
BodyInstance->RigidActorAsyncId = PCollection->getId(*BodyInstance->RigidActorAsync);
}
}
//We must store the BaseId for shared resources.
FMemoryWriter Ar(OutBuffer);
uint8 bIsLittleEndian = PLATFORM_LITTLE_ENDIAN; //TODO: We should pass the target platform into this function and write it. Then swap the endian on the writer so the reader doesn't have to do it at runtime
Ar << bIsLittleEndian;
Ar << BaseId;
//Note that PhysX expects the binary data to be 128-byte aligned. Because of this we must pad
int32 BytesToPad = PHYSX_SERIALIZATION_ALIGNMENT - (Ar.Tell() % PHYSX_SERIALIZATION_ALIGNMENT);
OutBuffer.AddZeroed(BytesToPad);
FPhysXOutputStream Buffer(&OutBuffer);
PxSerialization::complete(*PCollection, *PRegistry, PExceptFor);
PxSerialization::serializeCollectionToBinary(Buffer, *PCollection, *PRegistry, PExceptFor);
#if PHYSX_MEMORY_VALIDATION
GPhysXAllocator->ValidateHeaders();
#endif
PCollection->release();
PExceptFor->release();
PRegistry->release();
#if PHYSX_MEMORY_VALIDATION
GPhysXAllocator->ValidateHeaders();
#endif
return true;
#endif
return false;
}