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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtOpenVG module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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 QGLTexture;
class QGLTexturePoolPrivate;
class QGLTexturePool
{
public:
QGLTexturePool();
virtual ~QGLTexturePool();
static QGLTexturePool *instance();
// Create a new texture with the specified parameters and associate
// it with "texture". The QGLTexture will be notified when the
// texture needs to be reclaimed by the pool.
//
// This function will call reclaimSpace() when texture creation fails.
GLuint createTexture(GLenum target,
GLint level,
GLint internalformat,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
QGLTexture *texture);
// 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);
// Notify the pool that a QGLTexture object is using
// an texture again. This allows the pool to move the texture
// within a least-recently-used list of QGLTexture objects.
void useTexture(QGLTexture *texture);
// Notify the pool that the texture associated with a
// QGLTexture is being detached from the pool. The caller
// will become responsible for calling glDeleteTextures().
void detachTexture(QGLTexture *texture);
// 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 "texture" parameter
// indicates the texture that is trying to obtain space which should
// not itself be reclaimed.
bool reclaimSpace(GLint internalformat,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
QGLTexture *data);
// Hibernate the texture 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 QGLTexture objects.
void moveToHeadOfLRU(QGLTexture *texture);
void removeFromLRU(QGLTexture *texture);
QGLTexture *textureLRU();
private:
QScopedPointer<QGLTexturePoolPrivate> d_ptr;
Q_DECLARE_PRIVATE(QGLTexturePool)
Q_DISABLE_COPY(QGLTexturePool)
};
QT_END_NAMESPACE
#endif
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