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/* Copyright 2019 David Grote, Maxence Thevenet, Remi Lehe
* Weiqun Zhang
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#ifndef WARPX_PARTICLES_PUSHER_GETANDSETPOSITION_H_
#define WARPX_PARTICLES_PUSHER_GETANDSETPOSITION_H_
#include "Particles/WarpXParticleContainer.H"
#include <AMReX_REAL.H>
#include <limits>
/** \brief Functor that can be used to extract the positions of the macroparticles
* inside a ParallelFor kernel
*
* \param a_pti iterator to the tile containing the macroparticles
* \param a_offset offset to apply to the particle indices
*/
struct GetParticlePosition
{
using PType = WarpXParticleContainer::ParticleType;
using RType = amrex::ParticleReal;
const PType* AMREX_RESTRICT m_structs;
#if (defined WARPX_DIM_RZ)
const RType* m_theta;
#elif (AMREX_SPACEDIM == 2)
static constexpr RType m_snan = std::numeric_limits<RType>::quiet_NaN();
#endif
GetParticlePosition (const WarpXParIter& a_pti, int a_offset = 0) noexcept
{
const auto& aos = a_pti.GetArrayOfStructs();
m_structs = aos().dataPtr() + a_offset;
#if (defined WARPX_DIM_RZ)
const auto& soa = a_pti.GetStructOfArrays();
m_theta = soa.GetRealData(PIdx::theta).dataPtr() + a_offset;
#endif
}
/** \brief Extract the cartesian position coordinates of the particle
* located at index `i + a_offset` and store them in the variables
* `x`, `y`, `z` */
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
void operator() (const int i, RType& x, RType& y, RType& z) const noexcept
{
#ifdef WARPX_DIM_RZ
RType r = m_structs[i].pos(0);
x = r*std::cos(m_theta[i]);
y = r*std::sin(m_theta[i]);
z = m_structs[i].pos(1);
#elif WARPX_DIM_3D
x = m_structs[i].pos(0);
y = m_structs[i].pos(1);
z = m_structs[i].pos(2);
#else
x = m_structs[i].pos(0);
y = m_snan;
z = m_structs[i].pos(1);
#endif
}
};
/** \brief Functor that can be used to modify the positions of the macroparticles,
* inside a ParallelFor kernel.
*
* \param a_pti iterator to the tile being modified
* \param a_offset offset to apply to the particle indices
*/
struct SetParticlePosition
{
using PType = WarpXParticleContainer::ParticleType;
using RType = amrex::ParticleReal;
PType* AMREX_RESTRICT m_structs;
#if (defined WARPX_DIM_RZ)
RType* AMREX_RESTRICT m_theta;
#endif
SetParticlePosition (WarpXParIter& a_pti, int a_offset = 0) noexcept
{
auto& aos = a_pti.GetArrayOfStructs();
m_structs = aos().dataPtr() + a_offset;
#if (defined WARPX_DIM_RZ)
auto& soa = a_pti.GetStructOfArrays();
m_theta = soa.GetRealData(PIdx::theta).dataPtr() + a_offset;
#endif
}
/** \brief Set the position of the particle at index `i + a_offset`
* to `x`, `y`, `z` */
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
void operator() (const int i, RType x, RType y, RType z) const noexcept
{
#ifdef WARPX_DIM_RZ
m_theta[i] = std::atan2(y, x);
m_structs[i].pos(0) = std::sqrt(x*x + y*y);
m_structs[i].pos(1) = z;
#elif WARPX_DIM_3D
m_structs[i].pos(0) = x;
m_structs[i].pos(1) = y;
m_structs[i].pos(2) = z;
#else
m_structs[i].pos(0) = x;
m_structs[i].pos(1) = z;
#endif
}
};
#endif // WARPX_PARTICLES_PUSHER_GETANDSETPOSITION_H_
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