/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QOPENGL_P_H
#define QOPENGL_P_H

#include <qopengl.h>
#include <private/qopenglcontext_p.h>

#include <qthreadstorage.h>
#include <qcache.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QOpenGLExtensionMatcher
{
public:
    QOpenGLExtensionMatcher(const char *str);
    QOpenGLExtensionMatcher();

    bool match(const char *str) const {
        int str_length = qstrlen(str);

        Q_ASSERT(str);
        Q_ASSERT(str_length > 0);
        Q_ASSERT(str[str_length-1] != ' ');

        for (int i = 0; i < m_offsets.size(); ++i) {
            const char *extension = m_extensions.constData() + m_offsets.at(i);
            if (qstrncmp(extension, str, str_length) == 0 && extension[str_length] == ' ')
                return true;
        }
        return false;
    }

private:
    void init(const char *str);

    QByteArray m_extensions;
    QVector<int> m_offsets;
};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QOPENGL_H