FM3DH5BlockBase.h

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//
// Class FM3DH5BlockBase
//   Base class for 3D field-maps in stored in H5hut files.
//
// Copyright (c) 2020, Achim Gsell, Paul Scherrer Institut, Villigen PSI, Switzerland
// All rights reserved.
//
// This file is part of OPAL.
//
// OPAL 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 3 of the License, or
// (at your option) any later version.
//
// You should have received a copy of the GNU General Public License
// along with OPAL.  If not, see <https://www.gnu.org/licenses/>.
//
 
#ifndef CLASSIC_FIELDMAP3DH5BLOCKBASE_H
#define CLASSIC_FIELDMAP3DH5BLOCKBASE_H
 
#include "Fields/Fieldmap.h"
#include <vector>
 
#include "H5hut.h"
static_assert (sizeof(double) == sizeof (h5_float64_t),
               "double and h5_float64_t are not the same type" );
static_assert (sizeof(long long) == sizeof (h5_int64_t),
               "long long and h5_int64_t are not the same type" );
 
class _FM3DH5BlockBase: virtual public _Fieldmap {
 
public:
    virtual void readMap (
        ) {};
 
    virtual void freeMap (
        ) {};
 
    virtual bool getFieldstrength (
        const Vector_t& /*R*/, Vector_t& /*E*/, Vector_t& /*B*/) const = 0;
 
    virtual void getFieldDimensions (
        double &zBegin, double &zEnd
        ) const {
        zBegin = zbegin_m;
        zEnd = zend_m;
    }
 
    virtual void getFieldDimensions (
        double &xIni, double &xFinal,
        double &yIni, double &yFinal,
        double &zIni, double &zFinal
        ) const {
        xIni = xbegin_m;
        xFinal = xend_m;
        yIni = ybegin_m;
        yFinal = yend_m;
        zIni = zbegin_m;
        zFinal = zend_m;
    }
 
    virtual bool getFieldDerivative (
        const Vector_t &/*R*/,
        Vector_t &/*E*/,
        Vector_t &/*B*/,
        const DiffDirection &/*dir*/
        ) const {
        return false;
    }
 
    virtual void swap(
        ) {};
 
    virtual void getInfo (
        Inform *msg);
 
    virtual double getFrequency (
        ) const;
 
    virtual void setFrequency (
        double freq);
 
    virtual void getOnaxisEz (
        std::vector<std::pair<double, double> >& F);
 
protected:
    _FM3DH5BlockBase (
        ) {};
 
    virtual ~_FM3DH5BlockBase (
        ) {};
 
    void openFileMPIOCollective (
        const std::string& filename);
 
    long long getNumSteps (
        void);
 
    void setStep (
        const long long);
 
    void getFieldInfo (
        const char*);
 
    void getResonanceFrequency (
        void);
 
    void readField (
        const char* name,
        double* x,
        double* y,
        double* z
        );
 
    void closeFile (
        void);
 
    virtual bool isInside (
        const Vector_t &r
        ) const {
        return ((r(0) >= xbegin_m && r(0) < xend_m) &&
                (r(1) >= ybegin_m && r(1) < yend_m) &&
                (r(2) >= zbegin_m && r(2) < zend_m));
    }
 
    struct IndexTriplet {
        unsigned int i;
        unsigned int j;
        unsigned int k;
        Vector_t weight;
        IndexTriplet():
            i(0),
            j(0),
            k(0),
            weight(0.0)
        {}
    };
 
    /*
      The 3-dimensional fieldmaps are stored in a 1-dimensional arrays.
      Please note that the FORTRAN indexing scheme is used in H5hut!
 
      This functions maps the 3-dimensional index (i, j, k) to the
      corresponding index in the 1-dimensional array.
     */
    unsigned long getIndex (
        unsigned int i,
        unsigned int j,
        unsigned int k
        ) const {
        unsigned long result = j + k * num_gridpy_m;
        result = i + result * num_gridpx_m;
 
        return result;
    }
 
    /*
      Compute grid indices for a point X.
 
      Before calling this function a Isinside(X) test must
      to be performed!
 
      2-dim example with num_gridpx_m = 5, num_gridpy_m = 4
 
      3 +----+----+----+----+
        |    |    |    |    |
      2 +----+----+----+----+
        |    |    |    |   X|
      1 +----+----+----+----+
        |    |    |    |    |
      0 +----+----+----+----+
        0    1    2    3    4
 
      idx.x = 3
      idx.y = 1
 
      Notes:
      In above example: max for idx.x is num_gridpx_m - 2 which is 3.
 
      If X is close to a cell border, it can happen that the computation
      of the index is wrong due to rounding errors. In the example above
      idx.i == 4 instead of 3. To mitigate this issue we use __float128.
      To avoid out-of-bound errors we set the index to the max allowed
      value, if it is out of bound.
 
      std::fmod() doesn't support __float128 types! Best we can use is
      long double.
    */
    IndexTriplet getIndex(const Vector_t &X) const {
        IndexTriplet idx;
        long double difference = (long double)(X(0)) - (long double)(xbegin_m);
        idx.i = std::min(
                         (unsigned int)((difference) / (long double)(hx_m)),
                         num_gridpx_m-2
                         );
        idx.weight(0) = std::fmod(
                                  (long double)difference,
                                  (long double)hx_m
                                  );
 
        difference = (long double)(X(1)) - (long double)(ybegin_m);
        idx.j = std::min(
                         (unsigned int)((difference) / (long double)(hy_m)),
                         num_gridpy_m-2
                         );
        idx.weight(1) = std::fmod(
                                  (long double)difference,
                                  (long double)hy_m
                                  );
 
        difference = (long double)(X(2)) - (long double)(zbegin_m);
        idx.k = std::min(
                         (unsigned int)((difference) / (long double)(hz_m)),
                         num_gridpz_m-2
                         );
        idx.weight(2) = std::fmod(
                                  (long double)difference,
                                  (long double)hz_m
                                  );
        return idx;
    }
 
    double getWeightedData (
        const std::vector<double>& data,
        const IndexTriplet& idx,
        unsigned short corner) const;
 
    Vector_t interpolateTrilinearly (
        const std::vector<double>&,
        const std::vector<double>&,
        const std::vector<double>&,
        const Vector_t& X) const;
 
    enum : unsigned short {
        LX = 0,  // low X
        LY = 0,  // low Y
        LZ = 0,  // low Z
        HX = 4,  // high X
        HY = 2,  // high Y
        HZ = 1}; // high Z
 
    h5_file_t file_m;
    std::vector<double> FieldstrengthEz_m;    
    std::vector<double> FieldstrengthEx_m;    
    std::vector<double> FieldstrengthEy_m;    
    double xbegin_m;
    double xend_m;
 
    double ybegin_m;
    double yend_m;
 
    double zbegin_m;
    double zend_m;
 
    double hx_m;            
    double hy_m;            
    double hz_m;            
    unsigned int num_gridpx_m;    
    unsigned int num_gridpy_m;    
    unsigned int num_gridpz_m;    
    double frequency_m;
 
    bool swap_m;
    friend class _Fieldmap;
};
 
using FM3DH5BlockBase = std::shared_ptr<_FM3DH5BlockBase>;
 
#endif