qgsdemterraintileloader_p.h

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/***************************************************************************
  qgsdemterraintileloader_p.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 QGSDEMTERRAINTILELOADER_P_H
#define QGSDEMTERRAINTILELOADER_P_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.
//
 
#define SIP_NO_FILE
 
#include "qgschunknode.h"
#include "qgscoordinatetransformcontext.h"
#include "qgsrectangle.h"
#include "qgsterraintileloader.h"
#include "qgstilingscheme.h"
 
#include <QElapsedTimer>
#include <QFutureWatcher>
#include <QMutex>
#include <QtConcurrent/QtConcurrentRun>
 
class QgsRasterDataProvider;
class QgsRasterLayer;
class QgsCoordinateTransformContext;
class QgsTerrainGenerator;

class QgsDemTerrainTileLoader : public QgsTerrainTileLoader
{
    Q_OBJECT
  public:
    QgsDemTerrainTileLoader( QgsTerrainEntity *terrain, QgsChunkNode *node, QgsTerrainGenerator *terrainGenerator );
 
    void start() override;
 
    Qt3DCore::QEntity *createEntity( Qt3DCore::QEntity *parent ) override;
 
  private slots:
    void onHeightMapReady( int jobId, const QByteArray &heightMap );
 
  private:
    int mHeightMapJobId = -1;
    QByteArray mHeightMap;
    int mResolution = 0;
    float mSkirtHeight = 0;
    QgsTerrainGenerator *mTerrainGenerator;
};
 
 
class QgsTerrainDownloader;

class QgsDemHeightMapGenerator : public QObject
{
    Q_OBJECT
  public:
    QgsDemHeightMapGenerator( QgsRasterLayer *dtm, const QgsTilingScheme &tilingScheme, int resolution, const QgsCoordinateTransformContext &transformContext );
    ~QgsDemHeightMapGenerator() override;

    int render( const QgsChunkNodeId &nodeId );

    void waitForFinished();

    int resolution() const { return mResolution; }

    float heightAt( double x, double y );
 
  signals:
    void heightMapReady( int jobId, const QByteArray &heightMap );
 
  private slots:
    void onFutureFinished();
 
  private:
    const QgsRectangle mDtmExtent;

    QgsRasterDataProvider *mClonedProvider = nullptr;
 
    QgsTilingScheme mTilingScheme;
 
    int mResolution;
 
    int mLastJobId = 0;
 
    std::unique_ptr<QgsTerrainDownloader> mDownloader;
 
    struct JobData
    {
        int jobId;
        QgsChunkNodeId tileId;
        QgsRectangle extent;
        QFuture<QByteArray> future;
        QElapsedTimer timer;
    };
 
    QHash<QFutureWatcher<QByteArray> *, JobData> mJobs;
 
    void lazyLoadDtmCoarseData( int res, const QgsRectangle &rect );
    mutable QMutex mLazyLoadDtmCoarseDataMutex;
    QByteArray mDtmCoarseData;
 
    QgsCoordinateTransformContext mTransformContext;
};

 
#endif // QGSDEMTERRAINTILELOADER_P_H