1/****************************************************************************
2**
3** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt3D module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#ifndef QT3DCORE_QFRAMEALLOCATOR_P_H
41#define QT3DCORE_QFRAMEALLOCATOR_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of other Qt classes. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#ifdef QFRAMEALLOCATOR_DEBUG
55#include <valgrind/valgrind.h>
56#include <valgrind/memcheck.h>
57#endif
58
59#include <QtCore/QDebug>
60#include <QtCore/QScopedPointer>
61#include <QtCore/QVector>
62
63#include <Qt3DCore/private/qt3dcore_global_p.h>
64
65QT_BEGIN_NAMESPACE
66
67namespace Qt3DCore {
68
69class QFrameAllocatorPrivate;
70
71class Q_3DCORE_PRIVATE_EXPORT QFrameAllocator
72{
73public:
74 explicit QFrameAllocator(uint maxObjectSize, uint alignment = 16, uint pageSize = 128);
75 ~QFrameAllocator();
76
77 template<typename T>
78 T* allocate()
79 {
80 void* ptr = allocateRawMemory(size: sizeof(T));
81 new (ptr) T(); // Don't forget to call the constructor of the object using the placement new operator
82 return static_cast<T*>(ptr);
83 }
84
85 template<typename T>
86 void deallocate(T *ptr)
87 {
88 ptr->~T(); // Call destructor
89 deallocateRawMemory(ptr, size: sizeof(T));
90 }
91
92 void* allocateRawMemory(size_t size);
93
94 void deallocateRawMemory(void *ptr, size_t size);
95
96 void clear();
97 void trim();
98 uint maxObjectSize() const;
99 uint totalChunkCount() const;
100 int allocatorPoolSize() const;
101 bool isEmpty() const;
102
103private:
104 Q_DECLARE_PRIVATE(QFrameAllocator)
105 const QScopedPointer<QFrameAllocatorPrivate> d_ptr;
106};
107
108} // Qt3D
109
110QT_END_NAMESPACE
111
112#endif // QFRAMEALLOCATOR_P_H
113

source code of qt3d/src/core/resources/qframeallocator_p.h