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/* Copyright 2019-2020 Neil Zaim, Yinjian Zhao
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#include "ParticleUtils.H"
#include "WarpX.H"
#include <AMReX_Algorithm.H>
#include <AMReX_Array.H>
#include <AMReX_Box.H>
#include <AMReX_Dim3.H>
#include <AMReX_Geometry.H>
#include <AMReX_GpuLaunch.H>
#include <AMReX_GpuQualifiers.H>
#include <AMReX_IntVect.H>
#include <AMReX_MFIter.H>
#include <AMReX_PODVector.H>
#include <AMReX_ParticleTile.H>
#include <AMReX_REAL.H>
#include <AMReX_SPACE.H>
namespace ParticleUtils {
using namespace amrex;
// Define shortcuts for frequently-used type names
using ParticleType = WarpXParticleContainer::ParticleType;
using ParticleTileType = WarpXParticleContainer::ParticleTileType;
using ParticleBins = DenseBins<ParticleType>;
using index_type = ParticleBins::index_type;
/* Find the particles and count the particles that are in each cell.
Note that this does *not* rearrange particle arrays */
ParticleBins
findParticlesInEachCell( int const lev, MFIter const& mfi,
ParticleTileType const& ptile) {
// Extract particle structures for this tile
int const np = ptile.numParticles();
ParticleType const* particle_ptr = ptile.GetArrayOfStructs()().data();
// Extract box properties
Geometry const& geom = WarpX::GetInstance().Geom(lev);
Box const& cbx = mfi.tilebox(IntVect::TheZeroVector()); //Cell-centered box
const auto lo = lbound(cbx);
const auto dxi = geom.InvCellSizeArray();
const auto plo = geom.ProbLoArray();
// Find particles that are in each cell;
// results are stored in the object `bins`.
ParticleBins bins;
bins.build(np, particle_ptr, cbx,
// Pass lambda function that returns the cell index
[=] AMREX_GPU_DEVICE (const ParticleType& p) noexcept
{
return IntVect{AMREX_D_DECL(
static_cast<int>((p.pos(0)-plo[0])*dxi[0] - lo.x),
static_cast<int>((p.pos(1)-plo[1])*dxi[1] - lo.y),
static_cast<int>((p.pos(2)-plo[2])*dxi[2] - lo.z))};
});
return bins;
}
}
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