MRIdentifyVertices.h

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#pragma once
 
#include "MRMeshBuilderTypes.h"
#include "MRVector3.h"
#include "MRVector.h"
#include "MRphmap.h"
#include <cstring>
 
namespace MR
{
 
namespace MeshBuilder
{
 
struct equalVector3f
{
    bool operator() ( const Vector3f & a, const Vector3f & b ) const
    {
        static_assert( sizeof( Vector3f ) == 12 );
        char ax[12], bx[12];
        std::memcpy( ax, &a, 12 );
        std::memcpy( bx, &b, 12 );
        return std::memcmp( ax, bx, 12 ) == 0;
    }
};
 
class VertexIdentifier
{
public:
    MRMESH_API void reserve( size_t numTris );
    MRMESH_API void addTriangles( const std::vector<Triangle3f> & buffer );
    size_t numTris() const { return t_.size(); }
    Triangulation takeTriangulation() { return std::move( t_ ); }
    VertCoords takePoints() { return std::move( points_ ); }
 
private:
    using VertInHMap = std::array<VertId*, 3>;
    std::vector<VertInHMap> vertsInHMap_;
    using HMap = ParallelHashMap<Vector3f, VertId, phmap::priv::hash_default_hash<Vector3f>, equalVector3f>;
    HMap hmap_;
    Triangulation t_;
    VertCoords points_;
};
 
} //namespace MeshBuilder
 
} //namespace MR