136 lines
5.4 KiB
C++
136 lines
5.4 KiB
C++
/********************************************************************************
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* ReactPhysics3D physics library, http://www.reactphysics3d.com *
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* Copyright (c) 2010-2018 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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// Libraries
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#include "SingleFrameAllocator.h"
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#include "MemoryManager.h"
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#include <cstdlib>
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#include <cassert>
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using namespace reactphysics3d;
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// Constructor
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SingleFrameAllocator::SingleFrameAllocator()
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: mTotalSizeBytes(INIT_SINGLE_FRAME_ALLOCATOR_NB_BYTES),
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mCurrentOffset(0), mNbFramesTooMuchAllocated(0), mNeedToAllocatedMore(false) {
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// Allocate a whole block of memory at the beginning
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mMemoryBufferStart = static_cast<char*>(MemoryManager::getBaseAllocator().allocate(mTotalSizeBytes));
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assert(mMemoryBufferStart != nullptr);
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}
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// Destructor
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SingleFrameAllocator::~SingleFrameAllocator() {
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// Release the memory allocated at the beginning
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MemoryManager::getBaseAllocator().release(mMemoryBufferStart, mTotalSizeBytes);
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}
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// Allocate memory of a given size (in bytes) and return a pointer to the
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// allocated memory.
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void* SingleFrameAllocator::allocate(size_t size) {
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// Check that there is enough remaining memory in the buffer
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if (mCurrentOffset + size > mTotalSizeBytes) {
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// We need to allocate more memory next time reset() is called
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mNeedToAllocatedMore = true;
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// Return default memory allocation
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return MemoryManager::getBaseAllocator().allocate(size);
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}
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// Next available memory location
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void* nextAvailableMemory = mMemoryBufferStart + mCurrentOffset;
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// Increment the offset
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mCurrentOffset += size;
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// Return the next available memory location
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return nextAvailableMemory;
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}
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// Release previously allocated memory.
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void SingleFrameAllocator::release(void* pointer, size_t size) {
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// If allocated memory is not within the single frame allocation range
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char* p = static_cast<char*>(pointer);
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if (p < mMemoryBufferStart || p > mMemoryBufferStart + mTotalSizeBytes) {
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// Use default deallocation
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MemoryManager::getBaseAllocator().release(pointer, size);
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}
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}
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// Reset the marker of the current allocated memory
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void SingleFrameAllocator::reset() {
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// If too much memory is allocated
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if (mCurrentOffset < mTotalSizeBytes / 2) {
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mNbFramesTooMuchAllocated++;
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if (mNbFramesTooMuchAllocated > NB_FRAMES_UNTIL_SHRINK) {
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// Release the memory allocated at the beginning
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MemoryManager::getBaseAllocator().release(mMemoryBufferStart, mTotalSizeBytes);
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// Divide the total memory to allocate by two
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mTotalSizeBytes /= 2;
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if (mTotalSizeBytes == 0) mTotalSizeBytes = 1;
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// Allocate a whole block of memory at the beginning
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mMemoryBufferStart = static_cast<char*>(MemoryManager::getBaseAllocator().allocate(mTotalSizeBytes));
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assert(mMemoryBufferStart != nullptr);
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mNbFramesTooMuchAllocated = 0;
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}
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}
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else {
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mNbFramesTooMuchAllocated = 0;
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}
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// If we need to allocate more memory
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if (mNeedToAllocatedMore) {
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// Release the memory allocated at the beginning
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MemoryManager::getBaseAllocator().release(mMemoryBufferStart, mTotalSizeBytes);
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// Multiply the total memory to allocate by two
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mTotalSizeBytes *= 2;
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// Allocate a whole block of memory at the beginning
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mMemoryBufferStart = static_cast<char*>(MemoryManager::getBaseAllocator().allocate(mTotalSizeBytes));
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assert(mMemoryBufferStart != nullptr);
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mNeedToAllocatedMore = false;
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mNbFramesTooMuchAllocated = 0;
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}
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// Reset the current offset at the beginning of the block
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mCurrentOffset = 0;
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}
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