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physx/source/foundation/include/PsInlineAllocator.h

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+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of NVIDIA CORPORATION nor the names of its
+//    contributors may be used to endorse or promote products derived
+//    from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+// PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Copyright (c) 2008-2021 NVIDIA Corporation. All rights reserved.
+// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
+// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
+
+#ifndef PSFOUNDATION_PSINLINEALLOCATOR_H
+#define PSFOUNDATION_PSINLINEALLOCATOR_H
+
+#include "PsUserAllocated.h"
+
+namespace physx
+{
+namespace shdfnd
+{
+// this is used by the array class to allocate some space for a small number
+// of objects along with the metadata
+template <uint32_t N, typename BaseAllocator>
+class InlineAllocator : private BaseAllocator
+{
+  public:
+	InlineAllocator(const PxEMPTY v) : BaseAllocator(v)
+	{
+	}
+
+	InlineAllocator(const BaseAllocator& alloc = BaseAllocator()) : BaseAllocator(alloc), mBufferUsed(false)
+	{
+	}
+
+	InlineAllocator(const InlineAllocator& aloc) : BaseAllocator(aloc), mBufferUsed(false)
+	{
+	}
+
+	void* allocate(uint32_t size, const char* filename, int line)
+	{
+		if(!mBufferUsed && size <= N)
+		{
+			mBufferUsed = true;
+			return mBuffer;
+		}
+		return BaseAllocator::allocate(size, filename, line);
+	}
+
+	void deallocate(void* ptr)
+	{
+		if(ptr == mBuffer)
+			mBufferUsed = false;
+		else
+			BaseAllocator::deallocate(ptr);
+	}
+
+	PX_FORCE_INLINE uint8_t* getInlineBuffer()
+	{
+		return mBuffer;
+	}
+	PX_FORCE_INLINE bool isBufferUsed() const
+	{
+		return mBufferUsed;
+	}
+
+  protected:
+	uint8_t mBuffer[N];
+	bool mBufferUsed;
+};
+} // namespace shdfnd
+} // namespace physx
+
+#endif // #ifndef PSFOUNDATION_PSINLINEALLOCATOR_H