SpatialSort.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
 
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  copyright notice, this list of conditions and the
  following disclaimer.
 
* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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  written permission of the assimp team.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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*/
 
#pragma once
#ifndef AI_SPATIALSORT_H_INC
#define AI_SPATIALSORT_H_INC
 
#ifdef __GNUC__
#pragma GCC system_header
#endif
 
#include <assimp/types.h>
#include <vector>
 
namespace Assimp {
 
// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
class ASSIMP_API SpatialSort {
public:
    SpatialSort();
 
    // ------------------------------------------------------------------------------------
    SpatialSort(const aiVector3D *pPositions, unsigned int pNumPositions,
            unsigned int pElementOffset);
 
    ~SpatialSort();
 
    // ------------------------------------------------------------------------------------
    void Fill(const aiVector3D *pPositions, unsigned int pNumPositions,
            unsigned int pElementOffset,
            bool pFinalize = true);
 
    // ------------------------------------------------------------------------------------
    void Append(const aiVector3D *pPositions, unsigned int pNumPositions,
            unsigned int pElementOffset,
            bool pFinalize = true);
 
    // ------------------------------------------------------------------------------------
    void Finalize();
 
    // ------------------------------------------------------------------------------------
    void FindPositions(const aiVector3D &pPosition, ai_real pRadius,
            std::vector<unsigned int> &poResults) const;
 
    // ------------------------------------------------------------------------------------
    void FindIdenticalPositions(const aiVector3D &pPosition,
            std::vector<unsigned int> &poResults) const;
 
    // ------------------------------------------------------------------------------------
    unsigned int GenerateMappingTable(std::vector<unsigned int> &fill,
            ai_real pRadius) const;
 
protected:
    aiVector3D mPlaneNormal;
 
    struct Entry {
        unsigned int mIndex; 
        aiVector3D mPosition; 
        ai_real mDistance; 
 
        Entry() AI_NO_EXCEPT
                : mIndex(999999999),
                  mPosition(),
                  mDistance(99999.) {
            // empty
        }
        Entry(unsigned int pIndex, const aiVector3D &pPosition, ai_real pDistance) :
                mIndex(pIndex), mPosition(pPosition), mDistance(pDistance) {
            // empty
        }
 
        bool operator<(const Entry &e) const { return mDistance < e.mDistance; }
    };
 
    // all positions, sorted by distance to the sorting plane
    std::vector<Entry> mPositions;
};
 
} // end of namespace Assimp
 
#endif // AI_SPATIALSORT_H_INC