qgs3dmapscene.h

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/***************************************************************************
  qgs3dmapscene.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 QGS3DMAPSCENE_H
#define QGS3DMAPSCENE_H

#include "qgis_3d.h"

#include <Qt3DCore/QEntity>

namespace Qt3DRender
{
  class QRenderSettings;
  class QCamera;
  class QPickEvent;
}

namespace Qt3DLogic
{
  class QFrameAction;
}

namespace Qt3DExtras
{
  class QForwardRenderer;
}

class QgsAbstract3DEngine;
class QgsMapLayer;
class QgsCameraController;
class Qgs3DMapScenePickHandler;
class Qgs3DMapSettings;
class QgsTerrainEntity;
class QgsChunkedEntity;

class _3D_EXPORT Qgs3DMapScene : public Qt3DCore::QEntity
{
    Q_OBJECT
  public:
    Qgs3DMapScene( const Qgs3DMapSettings &map, QgsAbstract3DEngine *engine );

    QgsCameraController *cameraController() { return mCameraController; }
    QgsTerrainEntity *terrainEntity() { return mTerrain; }

    void viewZoomFull();

    int terrainPendingJobsCount() const;

    enum SceneState
    {
      Ready,     
      Updating,  
    };

    SceneState sceneState() const { return mSceneState; }

    void registerPickHandler( Qgs3DMapScenePickHandler *pickHandler );
    void unregisterPickHandler( Qgs3DMapScenePickHandler *pickHandler );

    float worldSpaceError( float epsilon, float distance );

  signals:
    void terrainEntityChanged();
    void terrainPendingJobsCountChanged();
    void sceneStateChanged();

  private slots:
    void onCameraChanged();
    void onFrameTriggered( float dt );
    void createTerrain();
    void onLayerRenderer3DChanged();
    void onLayersChanged();
    void createTerrainDeferred();
    void onBackgroundColorChanged();
    void onLayerEntityPickEvent( Qt3DRender::QPickEvent *event );

  private:
    void addLayerEntity( QgsMapLayer *layer );
    void removeLayerEntity( QgsMapLayer *layer );
    void addCameraViewCenterEntity( Qt3DRender::QCamera *camera );
    void setSceneState( SceneState state );
    void updateSceneState();
    void updateScene();
    bool updateCameraNearFarPlanes();

  private:
    const Qgs3DMapSettings &mMap;
    QgsAbstract3DEngine *mEngine = nullptr;
    Qt3DLogic::QFrameAction *mFrameAction = nullptr;
    QgsCameraController *mCameraController = nullptr;
    QgsTerrainEntity *mTerrain = nullptr;
    QList<QgsChunkedEntity *> mChunkEntities;
    Qt3DCore::QEntity *mEntityCameraViewCenter = nullptr;
    QMap<QgsMapLayer *, Qt3DCore::QEntity *> mLayerEntities;
    bool mTerrainUpdateScheduled = false;
    SceneState mSceneState = Ready;
    QList<Qgs3DMapScenePickHandler *> mPickHandlers;
};

#endif // QGS3DMAPSCENE_H