/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt3D module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL3$
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** GNU Lesser General Public License Usage
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
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****************************************************************************/

#ifndef QT3D_QBUFFER_H
#define QT3D_QBUFFER_H

#include <Qt3DCore/qabstractbuffer.h>
#include <Qt3DRenderer/qt3drenderer_global.h>
#include <QSharedPointer>
#include <QOpenGLBuffer>

QT_BEGIN_NAMESPACE

namespace Qt3D {

GLint elementType(GLint type);
GLint tupleSizeFromType(GLint type);
GLuint byteSizeFromType(GLint type);

class BufferPrivate;

class QT3DRENDERERSHARED_EXPORT Buffer : public QAbstractBuffer
{
public:
    explicit Buffer(QOpenGLBuffer::Type ty);

    void setUsage(QOpenGLBuffer::UsagePattern usage);
    QOpenGLBuffer::Type type() const;

    void bind() Q_DECL_OVERRIDE;
    void create() Q_DECL_OVERRIDE;

    QOpenGLBuffer createGL() const;
    void upload(QOpenGLBuffer b);

    // make a QObject and signal when contents change?
    // GraphicsContext could listen, orphan the QOpenGLBuffer and hence
    // reupload next time it's need
protected:
    Q_DECLARE_PRIVATE(Buffer)
    Buffer(BufferPrivate &dd, QOpenGLBuffer::Type ty);
};

typedef QSharedPointer<Buffer> BufferPtr;

} // Qt3D

QT_END_NAMESPACE

#endif // QT3D_QBUFFER_H
