137 lines
4.5 KiB
C++
137 lines
4.5 KiB
C++
// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2025 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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#ifndef CM_REFCOUNTABLE_H
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#define CM_REFCOUNTABLE_H
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#include "foundation/PxAssert.h"
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#include "foundation/PxAtomic.h"
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#include "foundation/PxAllocator.h"
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#include "common/PxBase.h"
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namespace physx
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{
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namespace Cm
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{
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// PT: this is used to re-implement RefCountable using the ref-counter in PxBase, i.e. to dissociate
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// the RefCountable data from the RefCountable code. The goal is to be able to store the ref counter
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// in the padding bytes of PxBase, and also to avoid two v-table pointers in the class.
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class RefCountableExt : public PxRefCounted
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{
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public:
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RefCountableExt() : PxRefCounted(0, PxBaseFlags(0)) {}
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void preExportDataReset()
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{
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mBuiltInRefCount = 1;
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}
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void incRefCount()
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{
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volatile PxI32* val = reinterpret_cast<volatile PxI32*>(&mBuiltInRefCount);
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PxAtomicIncrement(val);
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// value better be greater than 1, or we've created a ref to an undefined object
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PX_ASSERT(mBuiltInRefCount>1);
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}
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void decRefCount()
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{
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PX_ASSERT(mBuiltInRefCount>0);
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volatile PxI32* val = reinterpret_cast<volatile PxI32*>(&mBuiltInRefCount);
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if(physx::PxAtomicDecrement(val) == 0)
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onRefCountZero();
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}
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PX_FORCE_INLINE PxU32 getRefCount() const
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{
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return mBuiltInRefCount;
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}
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};
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PX_FORCE_INLINE void RefCountable_preExportDataReset(PxRefCounted& base) { static_cast<RefCountableExt&>(base).preExportDataReset(); }
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PX_FORCE_INLINE void RefCountable_incRefCount(PxRefCounted& base) { static_cast<RefCountableExt&>(base).incRefCount(); }
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PX_FORCE_INLINE void RefCountable_decRefCount(PxRefCounted& base) { static_cast<RefCountableExt&>(base).decRefCount(); }
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PX_FORCE_INLINE PxU32 RefCountable_getRefCount(const PxRefCounted& base) { return static_cast<const RefCountableExt&>(base).getRefCount(); }
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// simple thread-safe reference count
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// when the ref count is zero, the object is in an undefined state (pending delete)
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class RefCountable
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{
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public:
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// PX_SERIALIZATION
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RefCountable(const PxEMPTY) { PX_ASSERT(mRefCount == 1); }
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void preExportDataReset() { mRefCount = 1; }
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//~PX_SERIALIZATION
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explicit RefCountable(PxU32 initialCount = 1)
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: mRefCount(PxI32(initialCount))
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{
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PX_ASSERT(mRefCount!=0);
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}
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virtual ~RefCountable() {}
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/**
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Calls 'delete this;'. It needs to be overloaded for classes also deriving from
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PxBase and call 'Cm::deletePxBase(this);' instead.
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*/
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virtual void onRefCountZero()
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{
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PX_DELETE_THIS;
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}
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void incRefCount()
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{
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physx::PxAtomicIncrement(&mRefCount);
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// value better be greater than 1, or we've created a ref to an undefined object
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PX_ASSERT(mRefCount>1);
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}
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void decRefCount()
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{
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PX_ASSERT(mRefCount>0);
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if(physx::PxAtomicDecrement(&mRefCount) == 0)
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onRefCountZero();
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}
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PX_FORCE_INLINE PxU32 getRefCount() const
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{
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return PxU32(mRefCount);
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}
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private:
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volatile PxI32 mRefCount;
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};
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} // namespace Cm
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}
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#endif
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