qgspointcloud3dsymbol_p.h

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/***************************************************************************
  qgspointcloud3dsymbol_p.h
  ------------------------------
  Date                 : December 2020
  Copyright            : (C) 2020 by Nedjima Belgacem
  Email                : belgacem dot nedjima 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 QGSPOINTCLOUD3DSYMBOL_P_H
#define QGSPOINTCLOUD3DSYMBOL_P_H
 
 
#include "qgspointcloud3dsymbol.h"
 
#include "qgschunkloader_p.h"
#include "qgsfeature3dhandler_p.h"
#include "qgschunkedentity_p.h"
 
#include "qgspointcloudlayer3drenderer.h"
 
#include <QFutureWatcher>
#include <Qt3DRender/QGeometry>
#include <Qt3DRender/QBuffer>
#include <Qt3DRender/QMaterial>
#include <QVector3D>
 
#define SIP_NO_FILE
 
class IndexedPointCloudNode;
 
class QgsPointCloud3DSymbolHandler // : public QgsFeature3DHandler
{
  public:
    QgsPointCloud3DSymbolHandler();
 
    virtual ~QgsPointCloud3DSymbolHandler() = default;
 
    virtual bool prepare( const QgsPointCloud3DRenderContext &context ) = 0;// override;
    virtual void processNode( QgsPointCloudIndex *pc, const IndexedPointCloudNode &n, const QgsPointCloud3DRenderContext &context ) = 0; // override;
    virtual void finalize( Qt3DCore::QEntity *parent, const QgsPointCloud3DRenderContext &context ) = 0;// override;
 
    void triangulate( QgsPointCloudIndex *pc, const IndexedPointCloudNode &n, const QgsPointCloud3DRenderContext &context, const QgsAABB &bbox );
 
    float zMinimum() const { return mZMin; }
    float zMaximum() const { return mZMax; }
 
    struct PointData
    {
      QVector<QVector3D> positions;  // contains triplets of float x,y,z for each point
      QVector<float> parameter;
      QVector<QVector3D> colors;
      QByteArray triangles; // in case of points triangulation, contains index of point in the array positions
      QByteArray normals; // in case of points triangulation, contains the normals of the solid surface on each vertex
    };
 
  protected:
    float mZMin = std::numeric_limits<float>::max();
    float mZMax = std::numeric_limits<float>::lowest();
 
    void makeEntity( Qt3DCore::QEntity *parent, const QgsPointCloud3DRenderContext &context, const PointData &out, bool selected );
    virtual Qt3DRender::QGeometry *makeGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride ) = 0;
    QgsPointCloudBlock *pointCloudBlock( QgsPointCloudIndex *pc, const IndexedPointCloudNode &node, const QgsPointCloudRequest &request, const QgsPointCloud3DRenderContext &context );
 
    // outputs
    PointData outNormal;  
 
  private:
    std::vector<double> getVertices( QgsPointCloudIndex *pc, const IndexedPointCloudNode &n, const QgsPointCloud3DRenderContext &context, const QgsAABB &bbox );
 
    void calculateNormals( const std::vector<size_t> &triangles );
 
    void filterTriangles( const std::vector<size_t> &triangleIndexes, const QgsPointCloud3DRenderContext &context, const QgsAABB &bbox );
};
 
class QgsSingleColorPointCloud3DSymbolHandler : public QgsPointCloud3DSymbolHandler
{
  public:
    QgsSingleColorPointCloud3DSymbolHandler();
 
    bool prepare( const QgsPointCloud3DRenderContext &context ) override;
    void processNode( QgsPointCloudIndex *pc, const IndexedPointCloudNode &n, const QgsPointCloud3DRenderContext &context ) override;
    void finalize( Qt3DCore::QEntity *parent, const QgsPointCloud3DRenderContext &context ) override;
 
  private:
    Qt3DRender::QGeometry *makeGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride ) override;
};
 
class QgsColorRampPointCloud3DSymbolHandler : public QgsPointCloud3DSymbolHandler
{
  public:
    QgsColorRampPointCloud3DSymbolHandler();
 
    bool prepare( const QgsPointCloud3DRenderContext &context ) override;
    void processNode( QgsPointCloudIndex *pc, const IndexedPointCloudNode &n, const QgsPointCloud3DRenderContext &context ) override;
    void finalize( Qt3DCore::QEntity *parent, const QgsPointCloud3DRenderContext &context ) override;
 
  private:
    Qt3DRender::QGeometry *makeGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride ) override;
};
 
class QgsRGBPointCloud3DSymbolHandler : public QgsPointCloud3DSymbolHandler
{
  public:
    QgsRGBPointCloud3DSymbolHandler();
 
    bool prepare( const QgsPointCloud3DRenderContext &context ) override;
    void processNode( QgsPointCloudIndex *pc, const IndexedPointCloudNode &n, const QgsPointCloud3DRenderContext &context ) override;
    void finalize( Qt3DCore::QEntity *parent, const QgsPointCloud3DRenderContext &context ) override;
 
  private:
    Qt3DRender::QGeometry *makeGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride ) override;
};
 
class QgsClassificationPointCloud3DSymbolHandler : public QgsPointCloud3DSymbolHandler
{
  public:
    QgsClassificationPointCloud3DSymbolHandler();
 
    bool prepare( const QgsPointCloud3DRenderContext &context ) override;
    void processNode( QgsPointCloudIndex *pc, const IndexedPointCloudNode &n, const QgsPointCloud3DRenderContext &context ) override;
    void finalize( Qt3DCore::QEntity *parent, const QgsPointCloud3DRenderContext &context ) override;
 
  private:
    Qt3DRender::QGeometry *makeGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride ) override;
};
 
 
class QgsPointCloud3DGeometry: public Qt3DRender::QGeometry
{
    Q_OBJECT
 
  public:
    QgsPointCloud3DGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride );
 
  protected:
    virtual void makeVertexBuffer( const QgsPointCloud3DSymbolHandler::PointData &data ) = 0;
 
    Qt3DRender::QAttribute *mPositionAttribute = nullptr;
    Qt3DRender::QAttribute *mParameterAttribute = nullptr;
    Qt3DRender::QAttribute *mColorAttribute = nullptr;
    Qt3DRender::QAttribute *mTriangleIndexAttribute = nullptr;
    Qt3DRender::QAttribute *mNormalsAttribute = nullptr;
    Qt3DRender::QBuffer *mVertexBuffer = nullptr;
    Qt3DRender::QBuffer *mTriangleBuffer = nullptr;
    Qt3DRender::QBuffer *mNormalsBuffer = nullptr;
    int mVertexCount = 0;
 
    unsigned int mByteStride = 16;
};
 
class QgsSingleColorPointCloud3DGeometry : public QgsPointCloud3DGeometry
{
    Q_OBJECT
 
  public:
    QgsSingleColorPointCloud3DGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride );
 
  private:
    void makeVertexBuffer( const QgsPointCloud3DSymbolHandler::PointData &data ) override;
};
 
class QgsColorRampPointCloud3DGeometry : public QgsPointCloud3DGeometry
{
    Q_OBJECT
 
  public:
    QgsColorRampPointCloud3DGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride );
 
  private:
    void makeVertexBuffer( const QgsPointCloud3DSymbolHandler::PointData &data ) override;
};
 
class QgsRGBPointCloud3DGeometry : public QgsPointCloud3DGeometry
{
    Q_OBJECT
 
  public:
    QgsRGBPointCloud3DGeometry( Qt3DCore::QNode *parent, const QgsPointCloud3DSymbolHandler::PointData &data, unsigned int byteStride );
  private:
    void makeVertexBuffer( const QgsPointCloud3DSymbolHandler::PointData &data ) override;
};
 
 
 
#endif // QGSPOINTCLOUD3DSYMBOL_P_H