1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtOpenVG module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QGLTEXTUREPOOL_P_H
#define QGLTEXTUREPOOL_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qgl.h"
#include <QtCore/qscopedpointer.h>
QT_BEGIN_NAMESPACE
class QGLPixmapData;
class QGLTexturePoolPrivate;
class QGLTexturePool
{
public:
QGLTexturePool();
virtual ~QGLTexturePool();
static QGLTexturePool *instance();
// Create a new texture with the specified parameters and associate
// it with "data". The QGLPixmapData will be notified when the
// texture needs to be reclaimed by the pool.
//
// This function will call reclaimSpace() when texture creation fails.
GLuint createTextureForPixmap(GLenum target,
GLint level,
GLint internalformat,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
QGLPixmapData *data);
// Create a permanent texture with the specified parameters.
// If there is insufficient space for the texture,
// then this function will call reclaimSpace() and try again.
//
// The caller is responsible for calling glDeleteTextures()
// when it no longer needs the texture, as the texture is not
// recorded in the texture pool.
bool createPermanentTexture(GLuint texture,
GLenum target,
GLint level,
GLint internalformat,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
const GLvoid *data);
// Release a texture that is no longer required.
void releaseTexture(QGLPixmapData *data, GLuint texture);
// Notify the pool that a QGLPixmapData object is using
// an texture again. This allows the pool to move the texture
// within a least-recently-used list of QGLPixmapData objects.
void useTexture(QGLPixmapData *data);
// Notify the pool that the texture associated with a
// QGLPixmapData is being detached from the pool. The caller
// will become responsible for calling glDeleteTextures().
void detachTexture(QGLPixmapData *data);
// Reclaim space for an image allocation with the specified parameters.
// Returns true if space was reclaimed, or false if there is no
// further space that can be reclaimed. The "data" parameter
// indicates the pixmap that is trying to obtain space which should
// not itself be reclaimed.
bool reclaimSpace(GLint internalformat,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
QGLPixmapData *data);
// Hibernate the image pool because the context is about to be
// destroyed. All textures left in the pool should be released.
void hibernate();
protected:
// Helper functions for managing the LRU list of QGLPixmapData objects.
void moveToHeadOfLRU(QGLPixmapData *data);
void removeFromLRU(QGLPixmapData *data);
QGLPixmapData *pixmapLRU();
private:
QScopedPointer<QGLTexturePoolPrivate> d_ptr;
Q_DECLARE_PRIVATE(QGLTexturePool)
Q_DISABLE_COPY(QGLTexturePool)
};
QT_END_NAMESPACE
#endif
|
