glslmemorypool_p.h

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#ifndef QSSG_GLSLMEMORYPOOL_H
#define QSSG_GLSLMEMORYPOOL_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtQuick3DGlslParser/private/glsl_p.h>
 
#include <cstddef>
#include <new>
 
QT_BEGIN_NAMESPACE
 
namespace GLSL {
 
class MemoryPool;
 
class Q_QUICK3DGLSLPARSER_EXPORT MemoryPool
{
    MemoryPool(const MemoryPool &other);
    void operator =(const MemoryPool &other);
 
public:
    MemoryPool();
    ~MemoryPool();
 
    void reset();
 
    inline void *allocate(size_t size)
    {
        size = (size + 7) & ~7;
        if (_ptr && (_ptr + size < _end)) {
            void *addr = _ptr;
            _ptr += size;
            return addr;
        }
        return allocate_helper(size);
    }
 
private:
    void *allocate_helper(size_t size);
 
private:
    char **_blocks;
    int _allocatedBlocks;
    int _blockCount;
    char *_ptr;
    char *_end;
 
    enum
    {
        BLOCK_SIZE = 8 * 1024,
        DEFAULT_BLOCK_COUNT = 8
    };
};
 
class Q_QUICK3DGLSLPARSER_EXPORT Managed
{
    Managed(const Managed &other);
    void operator = (const Managed &other);
 
public:
    Managed();
    virtual ~Managed();
 
    void *operator new(size_t size, MemoryPool *pool);
    void operator delete(void *);
    void operator delete(void *, MemoryPool *);
};
 
} // namespace GLSL
 
QT_END_NAMESPACE
 
#endif // QSSG_GLSLMEMORYPOOL_H