/****************************************************************************
**
** Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
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** This file is part of the QtGui 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
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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** 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
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****************************************************************************/

#ifndef QOPENGLVERTEXARRAYOBJECT_H
#define QOPENGLVERTEXARRAYOBJECT_H

#include <QtCore/qglobal.h>

#ifndef QT_NO_OPENGL

#include <QtCore/QObject>
#include <QtGui/qopengl.h>

QT_BEGIN_NAMESPACE

class QOpenGLVertexArrayObjectPrivate;

class Q_GUI_EXPORT QOpenGLVertexArrayObject : public QObject
{
    Q_OBJECT

public:
    explicit QOpenGLVertexArrayObject(QObject* parent = 0);
    ~QOpenGLVertexArrayObject();

    bool create();
    void destroy();
    bool isCreated() const;
    GLuint objectId() const;
    void bind();
    void release();

    class Q_GUI_EXPORT Binder
    {
    public:
        inline Binder(QOpenGLVertexArrayObject *v)
            : vao(v)
        {
            Q_ASSERT(v);
            if (vao->isCreated() || vao->create())
                vao->bind();
        }

        inline ~Binder()
        {
            release();
        }

        inline void release()
        {
            vao->release();
        }

        inline void rebind()
        {
            vao->bind();
        }

    private:
        Q_DISABLE_COPY(Binder)
        QOpenGLVertexArrayObject *vao;
    };

private:
    Q_DISABLE_COPY(QOpenGLVertexArrayObject)
    Q_DECLARE_PRIVATE(QOpenGLVertexArrayObject)
    Q_PRIVATE_SLOT(d_func(), void _q_contextAboutToBeDestroyed())
    QOpenGLVertexArrayObject(QOpenGLVertexArrayObjectPrivate &dd);
};

QT_END_NAMESPACE

#endif

#endif // QOPENGLVERTEXARRAYOBJECT_H
