G4QSS3.cc

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//
// QSS3 implementation
//
// Author: Lucio Santi (Univ. Buenos Aires) - 2020-2021
// --------------------------------------------------------------------
 
#include "G4QSS3.hh"
 
G4QSS3::G4QSS3(QSS_simulator sim)
  : simulator(sim)
{
}
 
void G4QSS3::recompute_next_times(G4int* inf, G4double t)
{
  G4int i;
  G4double *x = simulator->x;
  G4double *q = simulator->q;
  G4double *lqu = simulator->lqu;
  G4double *time = simulator->nextStateTime;
  G4double coeff[4];
 
  for(i = 0; i < 3; ++i)
  {
    const G4int var = inf[i],
                cf0 = 4*var,
                cf1 = cf0 + 1,
                cf2 = cf1 + 1,
                cf3 = cf2 + 1;
 
    if(std::fabs(q[cf0] - x[cf0]) >= lqu[var])
    {
      time[var] = t;
    }
    else
    {
      coeff[0] = q[cf0] + lqu[var] - x[cf0];
      coeff[1] = q[cf1] - x[cf1];
      coeff[2] = q[cf2] - x[cf2];
      coeff[3] = -x[cf3];
      time[var] = t + min_pos_root_3_alt(coeff, q[cf0] - lqu[var] - x[cf0]);
    }
  }
}