qgschunkloader.h

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/***************************************************************************
  qgschunkloader.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 QGSCHUNKLOADER_H
#define QGSCHUNKLOADER_H

 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the QGIS API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
 
#include "qgis_3d.h"
#include "qgsbox3d.h"
#include "qgschunknode.h"
 
#include <QFuture>
#include <Qt3DCore/QEntity>
 
#define SIP_NO_FILE

struct QgsChunkLoaderResult
{
  public:
    std::function<Qt3DCore::QEntity *( Qt3DCore::QEntity *parent )> createEntity;
 
    static const QgsChunkLoaderResult sEmpty;
};
 

class QgsChunkLoader : public QObject
{
    Q_OBJECT
  public:
    ~QgsChunkLoader() override = default;

    virtual QFuture<QgsChunkLoaderResult> loadChunk( QgsChunkNode *node ) = 0;

    virtual QFuture<QgsChunkLoaderResult> updateChunk( QgsChunkNode *node );

    virtual int primitivesCount( QgsChunkNode *node ) const
    {
      Q_UNUSED( node );
      return 0;
    }

    virtual QgsChunkNode *createRootNode() const = 0;
    virtual QFuture<QVector<QgsChunkNode *>> createChildren( QgsChunkNode *node ) = 0;
};
 

class _3D_EXPORT QgsQuadtreeChunkLoader : public QgsChunkLoader
{
    Q_OBJECT
  public:
    QgsQuadtreeChunkLoader();
    ~QgsQuadtreeChunkLoader() override;

    void setupQuadtree( const QgsBox3D &rootBox3D, float rootError, int maxLevel = -1, const QgsBox3D &clippingBox3D = QgsBox3D() );
 
    QgsChunkNode *createRootNode() const override;
    QFuture<QVector<QgsChunkNode *>> createChildren( QgsChunkNode *node ) override;
 
  protected:
    QgsBox3D mRootBox3D;
    QgsBox3D mClippingBox3D;
    float mRootError = 0;
    int mMaxLevel = -1;
};

 
#endif // QGSCHUNKLOADER_H