105 lines
4.2 KiB
C++
105 lines
4.2 KiB
C++
/********************************************************************************
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* ReactPhysics3D physics library, http://www.reactphysics3d.com *
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* Copyright (c) 2010-2020 Daniel Chappuis *
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*********************************************************************************
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* *
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* This software is provided 'as-is', without any express or implied warranty. *
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* In no event will the authors be held liable for any damages arising from the *
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* use of this software. *
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* *
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* Permission is granted to anyone to use this software for any purpose, *
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* including commercial applications, and to alter it and redistribute it *
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* freely, subject to the following restrictions: *
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* *
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* 1. The origin of this software must not be misrepresented; you must not claim *
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* that you wrote the original software. If you use this software in a *
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* product, an acknowledgment in the product documentation would be *
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* appreciated but is not required. *
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* *
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* 2. Altered source versions must be plainly marked as such, and must not be *
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* misrepresented as being the original software. *
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* *
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* 3. This notice may not be removed or altered from any source distribution. *
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* *
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********************************************************************************/
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#ifndef REACTPHYSICS3D_SINGLE_FRAME_ALLOCATOR_H
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#define REACTPHYSICS3D_SINGLE_FRAME_ALLOCATOR_H
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// Libraries
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#include <reactphysics3d/memory/MemoryAllocator.h>
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#include <reactphysics3d/configuration.h>
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#include <mutex>
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/// ReactPhysics3D namespace
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namespace reactphysics3d {
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// Class SingleFrameAllocator
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/**
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* This class represent a memory allocator used to efficiently allocate
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* memory on the heap that is used during a single frame.
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*/
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class SingleFrameAllocator : public MemoryAllocator {
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private :
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// -------------------- Constants -------------------- //
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/// Number of frames to wait before shrinking the allocated
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/// memory if too much is allocated
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static const int NB_FRAMES_UNTIL_SHRINK = 120;
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/// Initial size (in bytes) of the single frame allocator
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size_t INIT_SINGLE_FRAME_ALLOCATOR_NB_BYTES = 1048576; // 1Mb
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// -------------------- Attributes -------------------- //
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/// Mutex
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std::mutex mMutex;
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/// Reference to the base memory allocator
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MemoryAllocator& mBaseAllocator;
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/// Total size (in bytes) of memory of the allocator
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size_t mTotalSizeBytes;
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/// Pointer to the beginning of the allocated memory block
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char* mMemoryBufferStart;
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/// Pointer to the next available memory location in the buffer
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size_t mCurrentOffset;
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/// Current number of frames since we detected too much memory
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/// is allocated
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size_t mNbFramesTooMuchAllocated;
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/// True if we need to allocate more memory in the next reset() call
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bool mNeedToAllocatedMore;
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public :
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// -------------------- Methods -------------------- //
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/// Constructor
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SingleFrameAllocator(MemoryAllocator& baseAllocator);
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/// Destructor
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virtual ~SingleFrameAllocator() override;
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/// Assignment operator
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SingleFrameAllocator& operator=(SingleFrameAllocator& allocator) = delete;
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/// Allocate memory of a given size (in bytes)
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virtual void* allocate(size_t size) override;
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/// Release previously allocated memory.
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virtual void release(void* pointer, size_t size) override;
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/// Reset the marker of the current allocated memory
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virtual void reset();
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};
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}
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#endif
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