qgstessellatedpolygongeometry.h

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/***************************************************************************
  qgstessellatedpolygongeometry.h
  --------------------------------------
  Date                 : July 2017
  Copyright            : (C) 2017 by Martin Dobias
  Email                : wonder dot sk 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 QGSTESSELLATEDPOLYGONGEOMETRY_H
#define QGSTESSELLATEDPOLYGONGEOMETRY_H

#include "qgsfeatureid.h"
#include "qgspolygon.h"

#include <Qt3DRender/QGeometry>

namespace Qt3DRender
{
  class QBuffer;
}

class QgsTessellatedPolygonGeometry : public Qt3DRender::QGeometry
{
    Q_OBJECT
  public:
    QgsTessellatedPolygonGeometry( QNode *parent = nullptr );

    bool invertNormals() const { return mInvertNormals; }
    void setInvertNormals( bool invert ) { mInvertNormals = invert; }

    bool addBackFaces() const { return mAddBackFaces; }

    void setAddBackFaces( bool add ) { mAddBackFaces = add; }

    void setPolygons( const QList<QgsPolygon *> &polygons, const QList<QgsFeatureId> &featureIds, const QgsPointXY &origin, float extrusionHeight, const QList<float> &extrusionHeightPerPolygon = QList<float>() );

    QgsFeatureId triangleIndexToFeatureId( uint triangleIndex ) const;

  private:

    Qt3DRender::QAttribute *mPositionAttribute = nullptr;
    Qt3DRender::QAttribute *mNormalAttribute = nullptr;
    Qt3DRender::QBuffer *mVertexBuffer = nullptr;

    QVector<QgsFeatureId> mTriangleIndexFids;
    QVector<uint> mTriangleIndexStartingIndices;

    bool mWithNormals = true;
    bool mInvertNormals = false;
    bool mAddBackFaces = false;
};

#endif // QGSTESSELLATEDPOLYGONGEOMETRY_H