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/****************************************************************************
**
** Copyright (C) 1999-2001 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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_MEMORY_H__
#define __QT3DS_MEMORY_H__
#include "Qt3DSMacros.h"
namespace Q3DStudio {
#define QT3DS_MEM_HEADERSIG 0xF00D
//==============================================================================
/**
* @class CMemory
* @brief Small wrapper around memory allocation.
* @see CSharedMemory
* @see SSharedHeader
*/
class CMemory
{
public:
static void *Allocate(long inSize);
static void *Reallocate(void *inMemory, long inSize);
static void Free(void *inMemory);
static void Error();
};
//==============================================================================
/**
* @struct SSharedHeader
* @brief Block of code at the beginning of memory enabling refcounting.
* @see CMemory
* @see CSharedMemory
*/
struct SSharedHeader
{
#ifdef DEBUG
long m_Signature;
#endif
long m_RefCount;
long m_Size;
};
//==============================================================================
/**
* @class CSharedMemory
* @brief Lowlevel memory class that hides extra header info enabling refcounting.
* @see CMemory
* @see SSharedHeader
*/
class CSharedMemory
{
protected:
#ifdef DEBUG
static void Validate(void *inMemory)
{
if ((reinterpret_cast<SSharedHeader *>(inMemory) - 1)->m_Size < 0
|| QT3DS_MEM_HEADERSIG != (reinterpret_cast<SSharedHeader *>(inMemory) - 1)->m_Signature)
CMemory::Error();
}
static SSharedHeader *Header(void *inMemory)
{
Validate(inMemory);
return reinterpret_cast<SSharedHeader *>(inMemory) - 1;
}
#else
// inline static void Validate( void* /*inMemory*/ ) {}
inline static SSharedHeader *Header(void *inMemory)
{
return reinterpret_cast<SSharedHeader *>(inMemory) - 1;
}
#endif
public:
inline static long *RefCountAddress(void *inMemory) { return &(Header(inMemory)->m_RefCount); }
inline static long GetSize(void *inMemory) { return Header(inMemory)->m_Size; }
static long AddRef(void *inMemory);
static long SubRef(void *inMemory);
static long Quantize(long inSpaceNeeded);
static void *Allocate(long inSize);
static void *Reallocate(void *inMemory, long inSize);
static void Free(void *inMemory);
};
} // namespace Q3DStudio
#endif // __QT3DS_MEMORY_H__
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