AMReX_FilCC_1D_C.H

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#ifndef AMREX_FILCC_1D_C_H_
#define AMREX_FILCC_1D_C_H_
#include <AMReX_Config.H>
 
#include <AMReX_FArrayBox.H>
#include <AMReX_BCRec.H>
#include <AMReX_Geometry.H>
 
namespace amrex {
 
struct FilccCell
{
    AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
    void operator() (const IntVect& iv, Array4<Real> const& q,
                     const int dcomp, const int numcomp,
                     Box const& domain_box, const BCRec* bcr,
                     const int bcomp) const noexcept
    {
        const int i = iv[0];
 
        const auto& domain_lo = domain_box.loVect();
        const auto& domain_hi = domain_box.hiVect();
        const int ilo = domain_lo[0];
        const int ihi = domain_hi[0];
        const int is = amrex::max(q.begin.x,ilo);
        const int ie = amrex::min(q.end.x-1,ihi);
 
        for (int n = dcomp; n < numcomp+dcomp; ++n)
        {
            const BCRec& bc = bcr[bcomp+n-dcomp];
 
            if (i < ilo)
            {
                switch (bc.lo(0)) {
                case (BCType::foextrap):
                {
                    q(i,0,0,n) = q(ilo,0,0,n);
                    break;
                }
                case (BCType::hoextrap):
                {
                    if (i < ilo - 1)
                    {
                        q(i,0,0,n) = q(ilo,0,0,n);
                    }
                    // i == ilo-1
                    else if (ilo+2 <= ie)
                    {
                        q(i,0,0,n) = Real(0.125)*(Real(15.)*q(i+1,0,0,n) - Real(10.)*q(i+2,0,0,n) + Real(3.)*q(i+3,0,0,n));
                    }
                    else
                    {
                        q(i,0,0,n) = Real(0.5)*(Real(3.)*q(i+1,0,0,n) - q(i+2,0,0,n));
                    }
                    break;
                }
                case (BCType::hoextrapcc):
                {
                    q(i,0,0,n) = Real(ilo-i)*(q(ilo,0,0,n) - q(ilo+1,0,0,n)) + q(ilo,0,0,n);
                    break;
                }
                case (BCType::reflect_even):
                {
                    q(i,0,0,n) = q(2*ilo-i-1,0,0,n);
                    break;
                }
                case (BCType::reflect_odd):
                {
                    q(i,0,0,n) = -q(2*ilo-i-1,0,0,n);
                    break;
                }
                default: { break; }
                }
            }
            else if (i > ihi)
            {
                switch (bc.hi(0)) {
                case (BCType::foextrap):
                {
                    q(i,0,0,n) = q(ihi,0,0,n);
                    break;
                }
                case (BCType::hoextrap):
                {
                    if (i > ihi + 1)
                    {
                        q(i,0,0,n) = q(ihi,0,0,n);
                    }
                    // i == ihi+1
                    else if (ihi-2 >= is)
                    {
                        q(i,0,0,n) = Real(0.125)*(Real(15.)*q(i-1,0,0,n) - Real(10.)*q(i-2,0,0,n) + Real(3.)*q(i-3,0,0,n));
                    }
                    else
                    {
                        q(i,0,0,n) = Real(0.5)*(Real(3.)*q(i-1,0,0,n) - q(i-2,0,0,n));
                    }
                    break;
                }
                case (BCType::hoextrapcc):
                {
                    q(i,0,0,n) = Real(i-ihi)*(q(ihi,0,0,n) - q(ihi-1,0,0,n)) + q(ihi,0,0,n);
                    break;
                }
                case (BCType::reflect_even):
                {
                    q(i,0,0,n) = q(2*ihi-i+1,0,0,n);
                    break;
                }
                case (BCType::reflect_odd):
                {
                    q(i,0,0,n) = -q(2*ihi-i+1,0,0,n);
                    break;
                }
                default: { break; }
                }
            }
        }
    }
};
 
}
 
#endif