/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Data Visualization module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
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** accordance with the commercial license agreement provided with the
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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 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
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//
//  W A R N I N G
//  -------------
//
// This file is not part of the QtDataVisualization API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef SCATTERPOINTBUFFERHELPER_P_H
#define SCATTERPOINTBUFFERHELPER_P_H

#include "datavisualizationglobal_p.h"
#include "abstractobjecthelper_p.h"
#include "scatterseriesrendercache_p.h"

QT_BEGIN_NAMESPACE_DATAVISUALIZATION

class ScatterPointBufferHelper : public AbstractObjectHelper
{
public:
    ScatterPointBufferHelper();
    virtual ~ScatterPointBufferHelper();

    GLuint pointBuf();

    void pushPoint(uint pointIndex);
    void popPoint();
    void load(ScatterSeriesRenderCache *cache);
    void update(ScatterSeriesRenderCache *cache);
    void setScaleY(float scale) { m_scaleY = scale; }
    void updateUVs(ScatterSeriesRenderCache *cache);

public:
    GLuint m_pointbuffer;

private:
    void createRangeGradientUVs(ScatterSeriesRenderCache *cache,
                                QVector<QVector2D> &buffered_uvs);

private:
    QVector<QVector3D> m_bufferedPoints;
    int m_oldRemoveIndex;
    float m_scaleY;
};

QT_END_NAMESPACE_DATAVISUALIZATION

#endif