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/****************************************************************************
**
** Copyright (C) 2008-2012 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#pragma once
#ifndef QT3DS_POOL_H
#define QT3DS_POOL_H
#include "foundation/Qt3DS.h"
#include "foundation/Qt3DSMath.h" //NVMax
#include "EASTL/vector.h"
namespace qt3ds {
namespace foundation {
// Pool of fixed size objects.
template <typename TObjType, typename TAllocator = EASTLAllocatorType,
QT3DSU32 alignmentInBytes = 4, QT3DSU32 slabSize = 4096>
class Pool
{
protected:
TAllocator mAllocator;
struct Link
{
Link *mNext;
Link(Link *next = NULL)
: mNext(next)
{
}
};
eastl::vector<void *, TAllocator> mSlabs;
Link *mFreeList;
public:
Pool(const TAllocator &alloc = TAllocator())
: mAllocator(alloc)
, mSlabs(alloc)
, mFreeList(NULL)
{
StaticAssert<sizeof(TObjType) < slabSize>::valid_expression();
}
~Pool()
{
for (QT3DSU32 idx = 0, end = mSlabs.size(); idx < end; ++idx)
mAllocator.deallocate(mSlabs[idx], slabSize);
mSlabs.clear();
mFreeList = NULL;
}
void appendToFreeList(Link *inLink)
{
inLink->mNext = mFreeList;
mFreeList = inLink;
}
void appendSlabToFreeList(void *slab)
{
QT3DSU8 *newMem = reinterpret_cast<QT3DSU8 *>(slab);
QT3DSU32 objSize = (QT3DSU32)qt3ds::NVMax(sizeof(TObjType), sizeof(Link));
// align the memory correctly
if (objSize % alignmentInBytes)
objSize += alignmentInBytes - (objSize % alignmentInBytes);
QT3DSU32 numObjsInSlab = slabSize / objSize;
for (QT3DSU32 idx = 0; idx < numObjsInSlab; ++idx) {
QT3DSU8 *objPtr = newMem + idx * objSize;
appendToFreeList(reinterpret_cast<Link *>(objPtr));
}
}
void allocateSlab(const char *file, int line)
{
QT3DSU32 objSize = (QT3DSU32)NVMax(sizeof(TObjType), sizeof(Link));
// align the memory correctly
if (objSize % alignmentInBytes)
objSize += alignmentInBytes - (objSize % alignmentInBytes);
QT3DSU8 *newMem = (QT3DSU8 *)mAllocator.allocate(slabSize, file, line);
if (newMem == NULL)
return; // out of mem, bad error
mSlabs.push_back(newMem);
appendSlabToFreeList(newMem);
}
void *allocate(const char *file, int line)
{
if (!mFreeList)
allocateSlab(file, line);
if (mFreeList) {
Link *retval = mFreeList;
mFreeList = retval->mNext;
return retval;
}
return NULL;
}
void deallocate(void *inPtr)
{
#if _DEBUG
// Ensure inPtr came from a known slab.
bool found = false;
for (QT3DSU32 idx = 0, end = mSlabs.size(); idx < end && !found; ++idx) {
QT3DSU8 *slabMem = reinterpret_cast<QT3DSU8 *>(mSlabs[idx]);
QT3DSU8 *slabEnd = slabMem + slabSize;
QT3DSU8 *memPtr = reinterpret_cast<QT3DSU8 *>(inPtr);
if (memPtr >= mSlabs[idx] && memPtr < slabEnd)
found = true;
}
QT3DS_ASSERT(found);
#endif
appendToFreeList(reinterpret_cast<Link *>(inPtr));
}
template <typename TArg1, typename TArg2>
TObjType *construct(const TArg1 &arg1, const TArg2 &arg2, const char *file, int line)
{
TObjType *newMem = (TObjType *)allocate(file, line);
return new (newMem) TObjType(arg1, arg2);
}
template <typename TArg1>
TObjType *construct(const TArg1 &arg1, const char *file, int line)
{
TObjType *newMem = (TObjType *)allocate(file, line);
return new (newMem) TObjType(arg1);
}
TObjType *construct(const char *file, int line)
{
TObjType *newMem = (TObjType *)allocate(file, line);
return new (newMem) TObjType();
}
};
}
}
#endif
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