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#include "CoarsenMR.H"
#include "Utils/TextMsg.H"
#include <AMReX_BLProfiler.H>
#include <AMReX_BLassert.H>
#include <AMReX_BoxArray.H>
#include <AMReX_Config.H>
#include <AMReX_GpuControl.H>
#include <AMReX_GpuLaunch.H>
#include <AMReX_IndexType.H>
#include <AMReX_IntVect.H>
#include <AMReX_MFIter.H>
#include <AMReX_MultiFab.H>
using namespace amrex;
void
CoarsenMR::Loop ( MultiFab& mf_dst,
const MultiFab& mf_src,
const int ncomp,
const IntVect ngrow,
const IntVect crse_ratio )
{
// Staggering of source fine MultiFab and destination coarse MultiFab
const IntVect stag_src = mf_src.boxArray().ixType().toIntVect();
const IntVect stag_dst = mf_dst.boxArray().ixType().toIntVect();
// Auxiliary integer arrays (always 3D)
GpuArray<int,3> sf; // staggering of source fine MultiFab
GpuArray<int,3> sc; // staggering of destination coarse MultiFab
GpuArray<int,3> cr; // coarsening ratio
sf[0] = stag_src[0];
#if defined(WARPX_DIM_1D_Z)
sf[1] = 0;
#else
sf[1] = stag_src[1];
#endif
#if (AMREX_SPACEDIM <= 2)
sf[2] = 0;
#elif defined(WARPX_DIM_3D)
sf[2] = stag_src[2];
#endif
sc[0] = stag_dst[0];
#if defined(WARPX_DIM_1D_Z)
sc[1] = 0;
#else
sc[1] = stag_dst[1];
#endif
#if (AMREX_SPACEDIM <= 2)
sc[2] = 0;
#elif defined(WARPX_DIM_3D)
sc[2] = stag_dst[2];
#endif
cr[0] = crse_ratio[0];
#if defined(WARPX_DIM_1D_Z)
cr[1] = 1;
#else
cr[1] = crse_ratio[1];
#endif
#if (AMREX_SPACEDIM <= 2)
cr[2] = 1;
#elif defined(WARPX_DIM_3D)
cr[2] = crse_ratio[2];
#endif
#ifdef AMREX_USE_OMP
#pragma omp parallel if (Gpu::notInLaunchRegion())
#endif
// Loop over boxes (or tiles if not on GPU)
for (MFIter mfi( mf_dst, TilingIfNotGPU() ); mfi.isValid(); ++mfi)
{
// Tiles defined at the coarse level
const Box& bx = mfi.growntilebox( ngrow );
Array4<Real> const& arr_dst = mf_dst.array( mfi );
Array4<Real const> const& arr_src = mf_src.const_array( mfi );
ParallelFor( bx, ncomp,
[=] AMREX_GPU_DEVICE( int i, int j, int k, int n )
{
arr_dst(i,j,k,n) = CoarsenMR::Interp(
arr_src, sf, sc, cr, i, j, k, n );
} );
}
}
void
CoarsenMR::Coarsen ( MultiFab& mf_dst,
const MultiFab& mf_src,
const IntVect crse_ratio )
{
BL_PROFILE("CoarsenMR::Coarsen()");
WARPX_ALWAYS_ASSERT_WITH_MESSAGE( mf_src.ixType() == mf_dst.ixType(),
"source MultiFab and destination MultiFab have different IndexType" );
// Number of guard cells to fill on coarse patch and number of components
const IntVect ngrow = ( mf_src.nGrowVect() + 1 ) / crse_ratio;
const int ncomp = mf_src.nComp();
CoarsenMR::Loop( mf_dst, mf_src, ncomp, ngrow, crse_ratio );
}
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