TRUST_2_CGNS.cpp

/****************************************************************************
* Copyright (c) 2026, CEA
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* 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 A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
 
#include <Domaine_dis_cache.h>
#include <communications.h>
#include <Comm_Group_MPI.h>
#include <TRUST_2_CGNS.h>
#include <unordered_set>
#include <Domaine_VF.h>
#include <Domaine.h>
#include <cstring>
 
#ifdef HAS_CGNS
 
namespace
{
#ifdef MPI_
bool is_comm_group_mode(const bool postraiter_domaine)
{
  return (Option_CGNS::LINKED_FILES_PER_COMM_GROUP || Option_CGNS::SINGLE_FILE_PER_COMM_GROUP)
         && Process::is_parallel() && PE_Groups::has_user_defined_group() && !postraiter_domaine;
}
 
void allgather_int_on_active_comm(const int local_value, std::vector<int>& global_values, const bool by_comm_grp)
{
  if (by_comm_grp)
    {
      const Comm_Group_MPI& comm_loc = ref_cast(Comm_Group_MPI, PE_Groups::get_user_defined_group());
      MPI_Allgather(&local_value, 1, MPI_ENTIER, global_values.data(), 1, MPI_ENTIER, comm_loc.get_mpi_comm());
    }
  else
    MPI_Allgather(&local_value, 1, MPI_ENTIER, global_values.data(), 1, MPI_ENTIER, MPI_COMM_WORLD);
}
 
void compute_global_min_max(const std::vector<int>& global_counts, std::vector<int>& global_min, std::vector<int>& global_max, int& total)
{
  const int nb_procs = static_cast<int>(global_counts.size());
  global_min.assign(nb_procs, -123);
  global_max.assign(nb_procs, -123);
  total = 0;
 
  for (int i = 0; i < nb_procs; i++)  // now we fill global incremented min/max stuff
    {
      global_min[i] = total + 1; // 1 : min
      total += global_counts[i]; // 2 : increment
      global_max[i] = total; // 3 : max
    }
}
 
void compute_global_max_only(const std::vector<int>& global_counts, std::vector<int>& global_max, int& total)
{
  const int nb_procs = static_cast<int>(global_counts.size());
  global_max.assign(nb_procs, -123);
  total = 0;
 
  for (int i = 0; i < nb_procs; i++)
    {
      total += global_counts[i]; // 1 : increment
      global_max[i] = total; // 2 : max
    }
}
#endif
}
 
Motcle TRUST_2_CGNS::modify_field_name_for_post(const Nom& id_du_champ, const Nom& id_du_domaine, const std::string& LOC, int& fieldId_som, int& fieldId_elem, int& fieldId_faces)
{
  Motcle id_du_champ_modifie(id_du_champ), iddomaine(id_du_domaine);
 
  if (LOC == "SOM")
    {
      id_du_champ_modifie.prefix(id_du_domaine);
      id_du_champ_modifie.prefix(iddomaine);
      id_du_champ_modifie.prefix("_SOM_");
    }
  else if (LOC == "ELEM")
    {
      id_du_champ_modifie.prefix(id_du_domaine);
      id_du_champ_modifie.prefix(iddomaine);
      id_du_champ_modifie.prefix("_ELEM_");
    }
  else if (LOC == "FACES")
    {
      id_du_champ_modifie.prefix(id_du_domaine);
      id_du_champ_modifie.prefix(iddomaine);
      id_du_champ_modifie.prefix("_FACES_");
    }
  else
    throw std::runtime_error("TRUST_2_CGNS::modify_field_name_for_post => Unsupported LOC : " + LOC);
 
  (LOC == "SOM") ? fieldId_som++ : ( (LOC == "ELEM") ? fieldId_elem++ : fieldId_faces++);
 
  /*
   * XXX Elie Saikali : dans CGNS on est limite a char de taille 32 max ! sinon pas supporte (regarde la methode cgi_check_strlen ...)
   * Go Bricorama !
   */
 
  const char * id_char = id_du_champ_modifie.getChar();
  size_t sz =  std::strlen(id_char);
  if (sz > CGNS_STR_SIZE)
    {
#ifndef NDEBUG
      Cerr << "The field " << id_char << " contains " << sz << " chars & CGNS is limited to " << CGNS_STR_SIZE << " ==> renamed to ";
#endif
 
      std::string new_id_du_champ_modifie(id_char);
 
      auto replace_all = [](std::string& s, const std::string& from, const std::string& to)
      {
        size_t pos = 0;
        while ((pos = s.find(from, pos)) != std::string::npos)
          {
            s.replace(pos, from.length(), to);
            pos += to.length();
          }
      };
 
      // 1. Premier essai : prefixer par le nom du cas si besoin
      Motcle truncate_try_1(id_du_champ_modifie), nom_du_cas(Objet_U::nom_du_cas());
      truncate_try_1.suffix(nom_du_cas.getChar());
      truncate_try_1.suffix("_");
 
      if (std::strlen(truncate_try_1.getChar()) <= CGNS_STR_SIZE)
        new_id_du_champ_modifie = truncate_try_1.getChar();
 
 
      // 2. Si toujours trop long, on tente qlqs remplacements
      if (new_id_du_champ_modifie.size() > CGNS_STR_SIZE)
        {
          replace_all(new_id_du_champ_modifie, "VITESSE", "VIT");
          replace_all(new_id_du_champ_modifie, "TEMPERATURE", "TEMP");
          replace_all(new_id_du_champ_modifie, "CONCENTRATION", "CONC");
          replace_all(new_id_du_champ_modifie, "CONVECTION", "CONV");
          replace_all(new_id_du_champ_modifie, "DIFFUSION", "DIFF");
          replace_all(new_id_du_champ_modifie, "VISQUEUSE", "VISQ");
          replace_all(new_id_du_champ_modifie, "MASSE_VOLUMIQUE", "RHO");
          replace_all(new_id_du_champ_modifie, "LIQUIDE", "LIQ");
        }
 
      // 3. Si encore trop long .. vraiment desole !
      if (new_id_du_champ_modifie.size() > CGNS_STR_SIZE)
        {
          static constexpr size_t keep_first = 25;
          static constexpr size_t keep_last = 5;
 
          const size_t new_sz = new_id_du_champ_modifie.size();
          const std::string prem = new_id_du_champ_modifie.substr(0, keep_first);
          const std::string der = new_id_du_champ_modifie.substr(new_sz - keep_last, keep_last);
 
          new_id_du_champ_modifie = prem + "__" + der;
        }
 
      id_du_champ_modifie = Motcle(new_id_du_champ_modifie.c_str());
 
#ifndef NDEBUG
      Cerr << id_du_champ_modifie << " !!! " << finl;
#endif
    }
 
  return id_du_champ_modifie;
}
 
// pour retirer boundaries_ du nom dom (ajoute par TRUST pour les bords ...)
std::string TRUST_2_CGNS::modify_domaine_name_for_post(const Nom& nom_dom)
{
  std::string nom_dom_modifie = nom_dom.getString();
 
  if (static_cast<int>(nom_dom_modifie.size()) >= CGNS_STR_SIZE)
    {
      size_t found = nom_dom_modifie.find("boundaries_");
      if (found != std::string::npos)
        nom_dom_modifie.erase(found, 11); // 11 is the length of "boundaries_"
 
//      if (static_cast<int>(nom_dom_modifie.size()) >= CGNS_STR_SIZE)
//        nom_dom_modifie.resize(CGNS_STR_SIZE, ' ');
      if (static_cast<int>(nom_dom_modifie.size()) >= CGNS_STR_SIZE)
        nom_dom_modifie.erase(CGNS_STR_SIZE-1);
    }
 
  return nom_dom_modifie;
}
 
void TRUST_2_CGNS::map_face_values(const Domaine_VF& dom_vf, const DoubleTab& val_src, DoubleTrav& val_trgt)
{
  const auto& dual_m = dom_vf.get_mc_dual_mesh();
  const int nb_cells = static_cast<int>(dual_m->getNumberOfCells());
  const auto& face_voisins = dom_vf.get_face_voisins_dual();
 
  assert (val_src.nb_dim() == 2);
  const int nb_j = val_src.dimension(1);
  val_trgt.resize(nb_cells, nb_j);
 
  for (int f = 0; f < val_src.dimension(0); f++)
    {
      const int e1 = face_voisins(f, 0), e2 = face_voisins(f, 1);
      for (int e: {e1, e2})
        {
          if (e < 0) continue;
 
//          for (int comp = 0; comp < nb_j; comp++)
//            val_trgt(e, comp) = val_src(f, comp);
          std::copy_n(&val_src(f, 0), nb_j, &val_trgt(e, 0));
        }
    }
}
 
void TRUST_2_CGNS::associer_domaine_TRUST(const Domaine * dom, const Domaine_dis_base* dom_dis, const DoubleTab& som, const IntTab& elem, const bool post_dom, const std::string& discr_type)
{
  if (dom) dom_trust_ = *dom;
  if (dom_dis) domaine_dis_ = *dom_dis;
  sommets_ = som;
  elems_ = elem;
  postraiter_domaine_ = post_dom;
  discr_type_ = discr_type;
}
 
void TRUST_2_CGNS::associer_connec_pour_dual(const IntTab& fs, const IntTab& ef)
{
  fs_dual_ = fs;
  ef_dual_ = ef;
}
 
void TRUST_2_CGNS::fill_coords(std::vector<double>& xCoords, std::vector<double>& yCoords, std::vector<double>& zCoords) const
{
  const int nb_som = sommets_->dimension(0), phys_dim = Objet_U::dimension;
  const DoubleTab& sommets = sommets_.valeur();
  assert (sommets_->dimension(1) > 1);
 
  xCoords.resize(nb_som);
  yCoords.resize(nb_som);
 
  if (phys_dim == 3)
    {
      assert(sommets_->dimension(1) > 2);
      zCoords.resize(nb_som);
    }
  else
    zCoords.clear();
 
  if (Objet_U::axi) // au cas ou
    {
      for (int i = 0; i < nb_som; ++i)
        {
          const double r = sommets(i, 0), theta = sommets(i, 1);
          xCoords[i] = r * cos(theta);
          yCoords[i] = r * sin(theta);
          if (phys_dim == 3)
            zCoords[i] = sommets(i, 2);
        }
    }
  else
    {
      for (int i = 0; i < nb_som; ++i)
        {
          xCoords[i] = sommets(i, 0);
          yCoords[i] = sommets(i, 1);
          if (phys_dim == 3)
            zCoords[i] = sommets(i, 2);
        }
    }
}
 
/*
 * NOTA BENE : postraiter_domaine_ toujours comme PARALLEL_OVER_ZONE, meme si c'est pas active
 */
void TRUST_2_CGNS::clear_vectors()
{
  if (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_) // XXX a voir plus tard si utile pour garder
    {
      proc_non_zero_elem_.clear();
      global_nb_elem_.clear();
      global_nb_som_.clear();
    }
 
  // globaux
  global_nb_face_som_.clear();
  global_nb_face_som_offset_.clear();
  global_nb_elem_face_.clear();
  global_nb_elem_face_offset_.clear();
  global_nb_elem_som_offset_.clear();
 
  global_incr_min_face_som_.clear();
  global_incr_max_face_som_.clear();
  global_incr_min_elem_face_.clear();
  global_incr_max_elem_face_.clear();
 
  // locaux
  local_fs_.clear();
  local_fs_offset_.clear();
  local_ef_.clear();
  local_ef_offset_.clear();
  local_es_.clear();
  local_es_offset_.clear();
}
 
void TRUST_2_CGNS::fill_global_infos()
{
#ifdef MPI_
  assert (sommets_ && elems_);
 
  const bool by_comm_grp = is_comm_group_mode(postraiter_domaine_);
 
  if (by_comm_grp)
    {
      const auto& grp = PE_Groups::get_user_defined_group();
      if (PE_Groups::enter_group(grp))
        {
          proc_me_local_comm_ = Process::me();
          nb_proc_local_comm_ = Process::nproc();
          PE_Groups::exit_group();
        }
    }
  else /* sinon au cas ou ... */
    {
      proc_me_local_comm_ = Process::me();
      nb_proc_local_comm_ = Process::nproc();
    }
 
  const int nb_procs = by_comm_grp ? nb_proc_local_comm_ : Process::nproc();
  const int nb_som = sommets_->dimension(0), nb_elem = elems_->dimension(0);
 
  par_in_zone_ = (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_) ? true : false;
 
  global_nb_elem_.assign(nb_procs, -123 /* default */);
  global_nb_som_.assign(nb_procs, -123 /* default */);
 
  allgather_int_on_active_comm(nb_elem, global_nb_elem_, by_comm_grp);
  allgather_int_on_active_comm(nb_som, global_nb_som_, by_comm_grp);
 
  if (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_)
    {
      compute_global_min_max(global_nb_elem_, global_incr_min_elem_, global_incr_max_elem_, ne_tot_);
      compute_global_min_max(global_nb_som_, global_incr_min_som_, global_incr_max_som_, ns_tot_);
    }
 
  const auto min_nb_elem = std::min_element(global_nb_elem_.begin(), global_nb_elem_.end());
  nb_procs_writing_ = nb_procs; // pour le moment
 
  if (*min_nb_elem <= 0) // not all procs will write !
    {
      // remplir proc_non_zero_elem avec le numero de proc si nb_elem > 0 !!
      for (int i = 0; i < static_cast<int>(global_nb_elem_.size()); i++)
        if (global_nb_elem_[i] > 0) proc_non_zero_elem_.push_back(i);
 
      nb_procs_writing_ = static_cast<int>(proc_non_zero_elem_.size());
      all_procs_write_ = false;
    }
#endif
}
 
void TRUST_2_CGNS::get_domaine_dis_vf_if_poly(Domaine_dis_base*& domaine_dis, Domaine_VF*& vf)
{
  assert(dom_trust_);
  domaine_dis = nullptr;
  vf = nullptr;
 
  if (!fs_dual_ && !ef_dual_)
    {
      if (domaine_dis_
          && domaine_dis_->domaine().le_nom() == dom_trust_->le_nom() // XXX peut etre sous_zone ;)
          && domaine_dis_->face_sommets().size() > 0)  // see if well filled for example
        {
          domaine_dis = &(domaine_dis_.valeur());
        }
      else
        {
          if (discr_type_ != "")
            domaine_dis = &(Domaine_dis_cache::Build_or_get_poly_post(discr_type_, dom_trust_.valeur()));
          else
            {
              // the user seems to post the domaine before discretizing the domain of before filling the post bloc ... we try our chance with Domaine_PolyMAC_MPFA
              Nom type = "Domaine_PolyMAC_MPFA";
              domaine_dis = &(Domaine_dis_cache::Build_or_get_poly_post(type, dom_trust_.valeur()));
            }
        }
 
      vf = &(ref_cast (Domaine_VF, *domaine_dis));
    }
}
 
void TRUST_2_CGNS::fill_global_infos_poly(const bool is_polyedre)
{
#ifdef MPI_
  assert(dom_trust_);
 
  const bool by_comm_grp = is_comm_group_mode(postraiter_domaine_);
 
  int decal = 0; // a modifier plus tard !!!
  const int nb_procs = by_comm_grp ? nb_proc_local_comm_ : Process::nproc();
 
  par_in_zone_ = (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_) ? true : false;
 
  if (is_polyedre)
    {
      Domaine_dis_base* domaine_dis = nullptr;
      Domaine_VF* vf = nullptr;
      get_domaine_dis_vf_if_poly(domaine_dis, vf);
 
      const IntTab& fs = vf ? (*vf).face_sommets() : fs_dual_.valeur();
      const IntTab& ef = vf ? (*vf).elem_faces() : ef_dual_.valeur();
      const int nb_fs = fs.dimension(0), nb_ef = ef.dimension(0);
 
      global_nb_face_som_.assign(nb_procs, -123 /* default */);
      global_nb_elem_face_.assign(nb_procs, -123 /* default */);
 
      allgather_int_on_active_comm(nb_fs, global_nb_face_som_, by_comm_grp);
      allgather_int_on_active_comm(nb_ef, global_nb_elem_face_, by_comm_grp);
 
      if (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_)
        {
          compute_global_min_max(global_nb_face_som_, global_incr_min_face_som_, global_incr_max_face_som_, nfs_tot_);
          compute_global_min_max(global_nb_elem_face_, global_incr_min_elem_face_, global_incr_max_elem_face_, nef_tot_);
        }
 
      // face_sommets : local vectors + offset
      if (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_)
        decal = compute_shift(global_incr_max_som_); // shift by sommets !!
 
      nb_fs_ = convert_connectivity_ngon(local_fs_, local_fs_offset_, is_polyedre, decal);
 
      // elem_faces : local vectors + offset
      if (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_)
        decal = compute_shift(global_incr_max_face_som_); // shift by faces !!
 
      nb_ef_ = convert_connectivity_nface(local_ef_, local_ef_offset_, decal);
 
      // finalement : decalage
      const int nb_fs_offset = static_cast<int>(local_fs_.size()), nb_ef_offset = static_cast<int>(local_ef_.size());
 
      global_nb_face_som_offset_.assign(nb_procs, -123 /* default */);
      global_nb_elem_face_offset_.assign(nb_procs, -123 /* default */);
 
      allgather_int_on_active_comm(nb_fs_offset, global_nb_face_som_offset_, by_comm_grp);
      allgather_int_on_active_comm(nb_ef_offset, global_nb_elem_face_offset_, by_comm_grp);
 
      if (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_)
        {
          // incr sur nb_faces et nb_elem tot offset
          std::vector<int> global_incr_max_face_som_offset, global_incr_max_elem_face_offset;
          compute_global_max_only(global_nb_face_som_offset_, global_incr_max_face_som_offset, nfs_offset_tot_);
          compute_global_max_only(global_nb_elem_face_offset_, global_incr_max_elem_face_offset, nef_offset_tot_);
 
          decal = compute_shift(global_incr_max_face_som_offset); // shift by faces offset !!
          for (auto &itr : local_fs_offset_) itr += decal;
 
          decal = compute_shift(global_incr_max_elem_face_offset); // shift by elem offset !!
          for (auto &itr : local_ef_offset_) itr += decal;
        }
    }
  else // polygon
    {
      if (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_)
        decal = compute_shift(global_incr_max_som_); // shift by sommets !!
 
      nb_es_ = convert_connectivity_ngon(local_es_, local_es_offset_, is_polyedre, decal);
 
      const int nb_es_offset = static_cast<int>(local_es_.size());
 
      // incr sur nb_elem tot offset
      global_nb_elem_som_offset_.assign(nb_procs, -123 /* default */);
 
      allgather_int_on_active_comm(nb_es_offset, global_nb_elem_som_offset_, by_comm_grp);
 
      if (!Option_CGNS::PARALLEL_OVER_ZONE && !postraiter_domaine_)
        {
          std::vector<int> global_incr_max_elem_som_offset;
          compute_global_max_only(global_nb_elem_som_offset_, global_incr_max_elem_som_offset, nes_offset_tot_);
 
          decal = compute_shift(global_incr_max_elem_som_offset); // shift by elem offset !!
          for (auto &itr : local_es_offset_) itr += decal;
        }
    }
#endif
}
 
int TRUST_2_CGNS::compute_shift(const std::vector<int>& vect_incr_max) const
{
#ifdef MPI_
  assert(par_in_zone_);
 
  const bool by_comm_grp = is_comm_group_mode(postraiter_domaine_);
 
  int proc_me = by_comm_grp ? proc_me_local_comm_ : Process::me();
 
  int decal = 0;
  if (all_procs_write_)
    {
      if (proc_me > 0) // pas maitre
        decal = vect_incr_max[proc_me - 1];
    }
  else
    {
      for (int i = 0; i < nb_procs_writing_; i++)
        if (proc_non_zero_elem_[i] == proc_me)
          if (i > 0) // pas premier case
            {
              decal = vect_incr_max[proc_non_zero_elem_[i] - 1];
              break;
            }
    }
  return decal;
#else
  return 0;
#endif
}
 
int TRUST_2_CGNS::convert_connectivity(const CGNS_TYPE type, std::vector<cgsize_t>& conn_elem ) const
{
  const int nb_elem = elems_->dimension(0);
  const IntTab& les_elems = elems_.valeur();
  int decal = par_in_zone_ ? compute_shift(global_incr_max_som_) : 0;
 
  int nodes_per_elem = -1;
 
  switch(type)
    {
    case CGNS_ENUMV(HEXA_8):
      nodes_per_elem = 8;
      break;
    case CGNS_ENUMV(QUAD_4):
      nodes_per_elem = 4;
      break;
    case CGNS_ENUMV(TETRA_4):
      nodes_per_elem = 4;
      break;
    case CGNS_ENUMV(TRI_3):
      nodes_per_elem = 3;
      break;
    case CGNS_ENUMV(BAR_2):
      nodes_per_elem = 2;
      break;
    case CGNS_ENUMV(NODE):
      nodes_per_elem = 1;
      break;
    default:
      Cerr << "Type not yet coded in TRUST_2_CGNS::convert_connectivity ! Call the 911 !" << finl;
      Process::exit();
      return -100;
    }
 
  if (nodes_per_elem != elems_->dimension(1))
    {
      Cerr << "Big issue in TRUST_2_CGNS::convert_connectivity !!!" << finl;
      Cerr << "   We have nodes_per_elem = " << nodes_per_elem << " while we have a connectivity of width = " << elems_->dimension(1) << finl;
      Process::exit();
      return -100;
    }
 
  conn_elem.resize(nb_elem * nodes_per_elem); // allocation une fois
  cgsize_t* data = conn_elem.data();
 
  switch(type)
    {
    case CGNS_ENUMV(HEXA_8):
      for (int i = 0; i < nb_elem; i++)
        {
          *data++ = les_elems(i, 0) + 1 + decal;
          *data++ = les_elems(i, 1) + 1 + decal;
          *data++ = les_elems(i, 3) + 1 + decal;
          *data++ = les_elems(i, 2) + 1 + decal;
          *data++ = les_elems(i, 4) + 1 + decal;
          *data++ = les_elems(i, 5) + 1 + decal;
          *data++ = les_elems(i, 7) + 1 + decal;
          *data++ = les_elems(i, 6) + 1 + decal;
        }
      break;
 
    case CGNS_ENUMV(QUAD_4):
      for (int i = 0; i < nb_elem; i++)
        {
          *data++ = les_elems(i, 0) + 1 + decal;
          *data++ = les_elems(i, 1) + 1 + decal;
          *data++ = les_elems(i, 3) + 1 + decal;
          *data++ = les_elems(i, 2) + 1 + decal;
        }
      break;
 
    case CGNS_ENUMV(TETRA_4):
    case CGNS_ENUMV(TRI_3):
    case CGNS_ENUMV(BAR_2):
    case CGNS_ENUMV(NODE):
      for (int i = 0; i < nb_elem; i++)
        for (int j = 0; j < nodes_per_elem; j++)
          *data++ = les_elems(i, j) + 1 + decal;
      break;
 
    default: /* already handled above */
      break;
    }
 
  return nodes_per_elem;
}
 
CGNS_TYPE TRUST_2_CGNS::convert_elem_type(const Motcle& type) const
{
  assert(elems_);
  const int nb_comp = elems_->dimension(1);
 
  if (type.debute_par("HEXAEDRE"))
    return CGNS_ENUMV(HEXA_8);
  else if (type.debute_par("RECTANGLE") || type.debute_par("QUADRANGLE"))
    return CGNS_ENUMV(QUAD_4);
  else if (type == "TETRAEDRE")
    return CGNS_ENUMV(TETRA_4);
  else if (type.debute_par("TRIANGLE"))
    return CGNS_ENUMV(TRI_3);
  else if (type == "POINT")
    return CGNS_ENUMV(NODE);
  else if (type == "POLYEDRE" || type.debute_par("POLYGONE") || type.debute_par("PRISME"))
    return CGNS_ENUMV(NGON_n);
  else if (type.debute_par("SEGMENT"))
    {
      /* So bad ... EF defined Bds as segments not points ... */
      if (nb_comp == 1) return CGNS_ENUMV(NODE);
      if (nb_comp == 2) return CGNS_ENUMV(BAR_2);
 
      Cerr << "Unexpected SEGMENT connectivity of width = " << nb_comp << finl;
      return CGNS_ENUMV(ElementTypeNull);
    }
  else
    {
      Cerr << "The type " << type << " is not yet available for the CGNS format ! Call the 911 !" << finl;
      Process::exit();
      return CGNS_ENUMV(ElementTypeNull);
    }
}
 
int TRUST_2_CGNS::topo_dim_from_elem(CGNS_TYPE etype, bool is_polyedre) const
{
  if (etype == CGNS_ENUMV(BAR_2) || etype == CGNS_ENUMV(NODE))
    return 1; // 1D
 
  if (etype == CGNS_ENUMV(TRI_3) || etype == CGNS_ENUMV(QUAD_4))
    return 2; // 2D classiques
 
  if (etype == CGNS_ENUMV(NGON_n))
    return is_polyedre ? 3 : 2; // NGON_n : 2D si polygone, 3D si polyedre (avec NFACE_n)
 
  // 3D classiques
  return 3; // TETRA_4, HEXA_8, NFACE_n
}
 
int TRUST_2_CGNS::convert_connectivity_nface(std::vector<cgsize_t>& econ, std::vector<cgsize_t>& eoff, int decal)
{
  assert (dom_trust_);
 
  Domaine_dis_base *domaine_dis = nullptr;
  Domaine_VF *vf = nullptr;
  get_domaine_dis_vf_if_poly(domaine_dis, vf);
 
  const IntTab& ef = vf ? (*vf).elem_faces() : ef_dual_.valeur();
 
  const int nElem = ef.dimension(0), maxDeg = ef.dimension(1);
 
  econ.clear(), eoff.clear();
 
  econ.reserve(static_cast<size_t>(nElem) * maxDeg); // chaque elem a au plus maxDeg faces
  eoff.reserve(static_cast<size_t>(nElem) + 1); // un par elem + 1 pour la fin
 
  eoff.push_back(0); // first index = > 0 !
 
  int s = 0;
  for (int e = 0; e < nElem; ++e)
    {
      for (int j = 0; j < maxDeg; ++j)
        {
          const int f = ef(e, j);
          if (f < 0)
            break;
 
          econ.push_back(static_cast<cgsize_t>(f + 1 + decal));
          ++s;
        }
      eoff.push_back(s);
    }
 
  // XXX Elie Saikali ...
  // on en a besoin pour eviter ce warning
  // reading zone "Zone_0002"
  // reading element set "NGON_n"
  // reading element set "NFACE_n"
  // ERROR:  duplicate positive faces indices detected in NFace_n Elements connectivity
  std::unordered_set<cgsize_t> seen;
  for (auto& itr : econ)
    {
      if (seen.find(itr) != seen.end())
        itr *= -1; // already seen -> times -1 !!!
      else
        seen.insert(itr);
    }
 
  return ef.dimension(0);
}
 
int TRUST_2_CGNS::convert_connectivity_ngon(std::vector<cgsize_t>& econ, std::vector<cgsize_t>& eoff, const bool is_polyedre, int decal)
{
  assert (dom_trust_);
  if (is_polyedre)
    {
      Domaine_dis_base* domaine_dis = nullptr;
      Domaine_VF* vf = nullptr;
      get_domaine_dis_vf_if_poly(domaine_dis, vf);
 
      const IntTab& fs = vf ? (*vf).face_sommets() : fs_dual_.valeur();
 
      const int nFace = fs.dimension(0), maxDeg = fs.dimension(1);
 
      econ.clear(), eoff.clear();
 
      econ.reserve(static_cast<size_t>(nFace) * maxDeg);
      eoff.reserve(static_cast<size_t>(nFace) + 1);
 
      eoff.push_back(0); // first index = > 0 !
      int s = 0;
      for (int f = 0; f < nFace; ++f)
        {
          for (int j = 0; j < maxDeg; ++j)
            {
              const int v = fs(f, j);
              if (v < 0)
                break;
 
              econ.push_back(static_cast<cgsize_t>(v + 1 + decal));
              ++s;
            }
          eoff.push_back(s);
        }
 
      return fs.dimension(0);
    }
  else // POLYGONE
    {
      const IntTab& les_elems = dom_trust_->les_elems();
 
      const int nElem = les_elems.dimension(0), maxDeg = les_elems.dimension(1);
 
      econ.clear(), eoff.clear();
 
      econ.reserve(static_cast<size_t>(nElem) * maxDeg);
      eoff.reserve(static_cast<size_t>(nElem) + 1);
 
      eoff.push_back(0); // first index = > 0 !
      int s = 0;
      for (int e = 0; e < nElem; ++e)
        {
          for (int j = 0; j < maxDeg; ++j)
            {
              const int v = les_elems(e, j);
              if (v < 0)
                break;
              econ.push_back(static_cast<cgsize_t>(v + 1 + decal));
              ++s;
            }
          eoff.push_back(s);
        }
 
      return les_elems.dimension(0);
    }
}
 
#endif /* HAS_CGNS */