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/** @file  IFC.cpp

 *  @brief Implementation of the Industry Foundation Classes loader.

 */

#ifndef INCLUDED_IFCUTIL_H

#define INCLUDED_IFCUTIL_H

#include "IFCReaderGen_2x3.h"

#include "IFCLoader.h"

#include "AssetLib/Step/STEPFile.h"

#include <assimp/mesh.h>

#include <assimp/material.h>

#include <utility>

struct aiNode;

namespace Assimp {

namespace IFC {

    typedef double IfcFloat;

    // IfcFloat-precision math data types

    typedef aiVector2t<IfcFloat> IfcVector2;

    typedef aiVector3t<IfcFloat> IfcVector3;

    typedef aiMatrix4x4t<IfcFloat> IfcMatrix4;

    typedef aiMatrix3x3t<IfcFloat> IfcMatrix3;

    typedef aiColor4t<IfcFloat> IfcColor4;

// ------------------------------------------------------------------------------------------------

// Helper for std::for_each to delete all heap-allocated items in a container

// ------------------------------------------------------------------------------------------------

template<typename T>

struct delete_fun {

    void operator()(T* del) {

        delete del;

    }

Unexecuted instantiation: Assimp::IFC::delete_fun<aiMesh>::operator()(aiMesh*)

Unexecuted instantiation: Assimp::IFC::delete_fun<aiMaterial>::operator()(aiMaterial*)

Unexecuted instantiation: Assimp::IFC::delete_fun<aiNode>::operator()(aiNode*)

};

// ------------------------------------------------------------------------------------------------

// Helper used during mesh construction. Aids at creating aiMesh'es out of relatively few polygons.

// ------------------------------------------------------------------------------------------------

struct TempMesh {

    std::vector<IfcVector3> mVerts;

    std::vector<unsigned int> mVertcnt;

    // utilities

    aiMesh* ToMesh();

    void Clear();

    void Transform(const IfcMatrix4& mat);

    IfcVector3 Center() const;

    void Append(const TempMesh& other);

    bool IsEmpty() const;

    void RemoveAdjacentDuplicates();

    void RemoveDegenerates();

    void FixupFaceOrientation();

    static IfcVector3 ComputePolygonNormal(const IfcVector3* vtcs, size_t cnt, bool normalize = true);

    IfcVector3 ComputeLastPolygonNormal(bool normalize = true) const;

    void ComputePolygonNormals(std::vector<IfcVector3>& normals, bool normalize = true, size_t ofs = 0) const;

    void Swap(TempMesh& other);

};

inline

bool TempMesh::IsEmpty() const {

    return mVerts.empty() && mVertcnt.empty();

}

// ------------------------------------------------------------------------------------------------

// Temporary representation of an opening in a wall or a floor

// ------------------------------------------------------------------------------------------------

struct TempOpening

{

    const IFC::Schema_2x3::IfcSolidModel *solid;

    IfcVector3 extrusionDir;

    std::shared_ptr<TempMesh> profileMesh;

    std::shared_ptr<TempMesh> profileMesh2D;

    // list of points generated for this opening. This is used to

    // create connections between two opposing holes created

    // from a single opening instance (two because walls tend to

    // have two sides). If !empty(), the other side of the wall

    // has already been processed.

    std::vector<IfcVector3> wallPoints;

    // ------------------------------------------------------------------------------

    TempOpening()

        : solid()

        , extrusionDir()

        , profileMesh()

    {

    }

    // ------------------------------------------------------------------------------

    TempOpening(const IFC::Schema_2x3::IfcSolidModel *solid, IfcVector3 extrusionDir,

            std::shared_ptr<TempMesh> profileMesh,

            std::shared_ptr<TempMesh> profileMesh2D) :

            solid(solid), extrusionDir(extrusionDir), profileMesh(std::move(profileMesh)), profileMesh2D(std::move(profileMesh2D)) {

    }

    // ------------------------------------------------------------------------------

    void Transform(const IfcMatrix4& mat); // defined later since TempMesh is not complete yet

    // ------------------------------------------------------------------------------

    // Helper to sort openings by distance from a given base point

    struct DistanceSorter {

        DistanceSorter(const IfcVector3& base) : base(base) {}

        bool operator () (const TempOpening& a, const TempOpening& b) const {

            return (a.profileMesh->Center()-base).SquareLength() < (b.profileMesh->Center()-base).SquareLength();

        }

        IfcVector3 base;

    };

};

// ------------------------------------------------------------------------------------------------

// Intermediate data storage during conversion. Keeps everything and a bit more.

// ------------------------------------------------------------------------------------------------

struct ConversionData

{

    ConversionData(const STEP::DB& db, const IFC::Schema_2x3::IfcProject& proj, aiScene* out,const IFCImporter::Settings& settings)

        : len_scale(1.0)

        , angle_scale(-1.0)

        , db(db)

        , proj(proj)

        , out(out)

        , settings(settings)

        , apply_openings()

        , collect_openings()

    {}

    ~ConversionData() {

        std::for_each(meshes.begin(),meshes.end(),delete_fun<aiMesh>());

        std::for_each(materials.begin(),materials.end(),delete_fun<aiMaterial>());

    }

    IfcFloat len_scale, angle_scale;

    bool plane_angle_in_radians;

    const STEP::DB& db;

    const IFC::Schema_2x3::IfcProject& proj;

    aiScene* out;

    IfcMatrix4 wcs;

    std::vector<aiMesh*> meshes;

    std::vector<aiMaterial*> materials;

    struct MeshCacheIndex {

        const IFC::Schema_2x3::IfcRepresentationItem* item; unsigned int matindex;

        MeshCacheIndex() : item(nullptr), matindex(0) { }

        MeshCacheIndex(const IFC::Schema_2x3::IfcRepresentationItem* i, unsigned int mi) : item(i), matindex(mi) { }

        bool operator == (const MeshCacheIndex& o) const { return item == o.item && matindex == o.matindex; }

        bool operator < (const MeshCacheIndex& o) const { return item < o.item || (item == o.item && matindex < o.matindex); }

    };

    typedef std::map<MeshCacheIndex, std::set<unsigned int> > MeshCache;

    MeshCache cached_meshes;

    typedef std::map<const IFC::Schema_2x3::IfcSurfaceStyle*, unsigned int> MaterialCache;

    MaterialCache cached_materials;

    const IFCImporter::Settings& settings;

    // Intermediate arrays used to resolve openings in walls: only one of them

    // can be given at a time. apply_openings if present if the current element

    // is a wall and needs its openings to be poured into its geometry while

    // collect_openings is present only if the current element is an

    // IfcOpeningElement, for which all the geometry needs to be preserved

    // for later processing by a parent, which is a wall.

    std::vector<TempOpening>* apply_openings;

    std::vector<TempOpening>* collect_openings;

    std::set<uint64_t> already_processed;

};

// ------------------------------------------------------------------------------------------------

// Binary predicate to compare vectors with a given, quadratic epsilon.

// ------------------------------------------------------------------------------------------------

struct FuzzyVectorCompare {

    FuzzyVectorCompare(IfcFloat epsilon) : epsilon(epsilon) {}

    bool operator()(const IfcVector3& a, const IfcVector3& b) {

        return std::abs((a-b).SquareLength()) < epsilon;

    }

    const IfcFloat epsilon;

};

// ------------------------------------------------------------------------------------------------

// Ordering predicate to totally order R^2 vectors first by x and then by y

// ------------------------------------------------------------------------------------------------

struct XYSorter {

    // sort first by X coordinates, then by Y coordinates

    bool operator () (const IfcVector2&a, const IfcVector2& b) const {

        if (a.x == b.x) {

            return a.y < b.y;

        }

        return a.x < b.x;

    }

};

// conversion routines for common IFC entities, implemented in IFCUtil.cpp

void ConvertColor(aiColor4D& out, const Schema_2x3::IfcColourRgb& in);

void ConvertColor(aiColor4D& out, const Schema_2x3::IfcColourOrFactor& in,ConversionData& conv,const aiColor4D* base);

void ConvertCartesianPoint(IfcVector3& out, const Schema_2x3::IfcCartesianPoint& in);

void ConvertDirection(IfcVector3& out, const Schema_2x3::IfcDirection& in);

void ConvertVector(IfcVector3& out, const Schema_2x3::IfcVector& in);

void AssignMatrixAxes(IfcMatrix4& out, const IfcVector3& x, const IfcVector3& y, const IfcVector3& z);

void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement3D& in);

void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement2D& in);

void ConvertAxisPlacement(IfcVector3& axis, IfcVector3& pos, const IFC::Schema_2x3::IfcAxis1Placement& in);

void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement& in, ConversionData& conv);

void ConvertTransformOperator(IfcMatrix4& out, const Schema_2x3::IfcCartesianTransformationOperator& op);

bool IsTrue(const Assimp::STEP::EXPRESS::BOOLEAN& in);

IfcFloat ConvertSIPrefix(const std::string& prefix);

// IFCProfile.cpp

bool ProcessProfile(const Schema_2x3::IfcProfileDef& prof, TempMesh& meshout, ConversionData& conv);

bool ProcessCurve(const Schema_2x3::IfcCurve& curve,  TempMesh& meshout, ConversionData& conv);

// IFCMaterial.cpp

unsigned int ProcessMaterials(uint64_t id, unsigned int prevMatId, ConversionData& conv, bool forceDefaultMat);

// IFCGeometry.cpp

IfcMatrix3 DerivePlaneCoordinateSpace(const TempMesh& curmesh, bool& ok, IfcVector3& norOut);

bool ProcessRepresentationItem(const Schema_2x3::IfcRepresentationItem& item, unsigned int matid, std::set<unsigned int>& mesh_indices, ConversionData& conv);

void AssignAddedMeshes(std::set<unsigned int>& mesh_indices,aiNode* nd,ConversionData& /*conv*/);

void ProcessSweptAreaSolid(const Schema_2x3::IfcSweptAreaSolid& swept, TempMesh& meshout,

                           ConversionData& conv);

void ProcessExtrudedAreaSolid(const Schema_2x3::IfcExtrudedAreaSolid& solid, TempMesh& result,

                              ConversionData& conv, bool collect_openings);

// IFCBoolean.cpp

void ProcessBoolean(const Schema_2x3::IfcBooleanResult& boolean, TempMesh& result, ConversionData& conv);

void ProcessBooleanHalfSpaceDifference(const Schema_2x3::IfcHalfSpaceSolid* hs, TempMesh& result,

                                       const TempMesh& first_operand,

                                       ConversionData& conv);

void ProcessPolygonalBoundedBooleanHalfSpaceDifference(const Schema_2x3::IfcPolygonalBoundedHalfSpace* hs, TempMesh& result,

                                                       const TempMesh& first_operand,

                                                       ConversionData& conv);

void ProcessBooleanExtrudedAreaSolidDifference(const Schema_2x3::IfcExtrudedAreaSolid* as, TempMesh& result,

                                               const TempMesh& first_operand,

                                               ConversionData& conv);

// IFCOpenings.cpp

bool GenerateOpenings(std::vector<TempOpening>& openings,

                      TempMesh& curmesh,

                      bool check_intersection,

                      bool generate_connection_geometry,

                      const IfcVector3& wall_extrusion_axis = IfcVector3(0,1,0));

// IFCCurve.cpp

// ------------------------------------------------------------------------------------------------

// Custom exception for use by members of the Curve class

// ------------------------------------------------------------------------------------------------

class CurveError {

public:

    CurveError(const std::string& s)

    : mStr(s) {

        // empty

    }

    std::string mStr;

};

// ------------------------------------------------------------------------------------------------

// Temporary representation for an arbitrary sub-class of IfcCurve. Used to sample the curves

// to obtain a list of line segments.

// ------------------------------------------------------------------------------------------------

class Curve {

protected:

    Curve(const Schema_2x3::IfcCurve& base_entity, ConversionData& conv)

    : base_entity(base_entity)

    , conv(conv) {

        // empty

    }

public:

    typedef std::pair<IfcFloat, IfcFloat> ParamRange;

    virtual ~Curve() = default;

    // check if a curve is closed

    virtual bool IsClosed() const = 0;

    // evaluate the curve at the given parametric position

    virtual IfcVector3 Eval(IfcFloat p) const = 0;

    // try to match a point on the curve to a given parameter

    // for self-intersecting curves, the result is not ambiguous and

    // it is undefined which parameter is returned.

    virtual bool ReverseEval(const IfcVector3& val, IfcFloat& paramOut) const;

    // get the range of the curve (both inclusive).

    // +inf and -inf are valid return values, the curve is not bounded in such a case.

    virtual std::pair<IfcFloat,IfcFloat> GetParametricRange() const = 0;

    IfcFloat GetParametricRangeDelta() const;

    // estimate the number of sample points that this curve will require

    virtual size_t EstimateSampleCount(IfcFloat start,IfcFloat end) const;

    // intelligently sample the curve based on the current settings

    // and append the result to the mesh

    virtual void SampleDiscrete(TempMesh& out,IfcFloat start,IfcFloat end) const;

#ifdef ASSIMP_BUILD_DEBUG

    // check if a particular parameter value lies within the well-defined range

    bool InRange(IfcFloat) const;

#endif

    static Curve* Convert(const IFC::Schema_2x3::IfcCurve&,ConversionData& conv);

protected:

    const Schema_2x3::IfcCurve& base_entity;

    ConversionData& conv;

};

// --------------------------------------------------------------------------------

// A BoundedCurve always holds the invariant that GetParametricRange()

// never returns infinite values.

// --------------------------------------------------------------------------------

class BoundedCurve : public Curve {

public:

    BoundedCurve(const Schema_2x3::IfcBoundedCurve& entity, ConversionData& conv)

        : Curve(entity,conv)

    {}

public:

    bool IsClosed() const;

public:

    // sample the entire curve

    void SampleDiscrete(TempMesh& out) const;

    using Curve::SampleDiscrete;

};

// IfcProfile.cpp

bool ProcessCurve(const Schema_2x3::IfcCurve& curve,  TempMesh& meshout, ConversionData& conv);

}

}

#endif