qgsbillboardgeometry.h

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/***************************************************************************
  qgsbillboardgeometry.h
  --------------------------------------
  Date                 : Jul 2019
  Copyright            : (C) 2019 by Ismail Sunni
  Email                : imajimatika at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSBILLBOARDGEOMETRY_H
#define QGSBILLBOARDGEOMETRY_H
 
#include "qgis_3d.h"
 
#include <QObject>
#include <QVector2D>
#include <QVector3D>
#include <Qt3DCore/QAttribute>
#include <Qt3DCore/QBuffer>
#include <Qt3DCore/QGeometry>
 
#define SIP_NO_FILE

class _3D_EXPORT QgsBillboardGeometry : public Qt3DCore::QGeometry
{
    Q_OBJECT
 
    Q_PROPERTY( int count READ count NOTIFY countChanged )
  public:
    QgsBillboardGeometry( Qt3DCore::QNode *parent = nullptr );

    void setPositions( const QVector<QVector3D> &vertices );

    struct BillboardAtlasData
    {
        QVector3D position;
        QVector2D textureAtlasOffset;
        QVector2D textureAtlasSize;
        QPoint pixelOffset;
    };

    void setBillboardData( const QVector<QgsBillboardGeometry::BillboardAtlasData> &billboards, bool includePixelOffsets = false );

    int count() const;
 
  signals:
    void countChanged( int count );
 
  private:
    enum class Mode
    {
      PositionOnly,
      PositionAndTextureData,
      PositionAndTextureDataWithPixelOffsets,
    };
    void setMode( Mode mode );
 
    Qt3DCore::QAttribute *mPositionAttribute = nullptr;
    Qt3DCore::QAttribute *mAtlasOffsetAttribute = nullptr;
    Qt3DCore::QAttribute *mAtlasSizeAttribute = nullptr;
    Qt3DCore::QAttribute *mAtlasPixelOffsetAttribute = nullptr;
    Qt3DCore::QBuffer *mVertexBuffer = nullptr;
    int mVertexCount = 0;
};
 
#endif // QGSBILLBOARDGEOMETRY_H