local_interpolation.f90

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module local_interpolation
  use tensor, only: triple_tensor_product, tnsr3d_el_list
  use space, only: space_t, gl, gll
  use num_types, only: rp
  use point, only: point_t
  use math, only: abscmp
  use fast3d, only: fd_weights_full, setup_intp
  use utils, only: neko_error
  use field, only: field_t
  use field_list, only: field_list_t
  use device
  use device_math, only: device_rzero
  use neko_config, only: neko_bcknd_device
  implicit none
 
  type :: local_interpolator_t
     type(space_t), pointer :: xh => null()
     integer :: n_points
     real(kind=rp), allocatable :: weights_r(:,:)
     real(kind=rp), allocatable :: weights_s(:,:)
     real(kind=rp), allocatable :: weights_t(:,:)
     type(c_ptr) :: weights_r_d = c_null_ptr
     type(c_ptr) :: weights_s_d = c_null_ptr
     type(c_ptr) :: weights_t_d = c_null_ptr
   contains
     procedure, pass(this) :: init => local_interpolator_init
     procedure, pass(this) :: free => local_interpolator_free
     procedure, pass(this) :: evaluate => local_interpolator_evaluate
     procedure, pass(this) :: compute_weights => local_interpolator_compute_weights
 
  end type local_interpolator_t
 
contains
 
  subroutine local_interpolator_init(this, Xh, r, s, t, n_points)
    class(local_interpolator_t), intent(inout), target :: this
    type(space_t), intent(in), target :: Xh
    integer, intent(in) :: n_points
    real(kind=rp) :: r(n_points), s(n_points), t(n_points)
    integer :: size_weights
    call this%free()
    if ((xh%t .eq. gl) .or. (xh%t .eq. gll)) then
    else
       call neko_error('Unsupported interpolation')
    end if
 
    this%Xh => xh
    this%n_points = n_points
    allocate(this%weights_r(xh%lx,n_points))
    allocate(this%weights_s(xh%ly,n_points))
    allocate(this%weights_t(xh%lz,n_points))
    call this%compute_weights(r, s, t)
    size_weights = xh%lx * n_points
 
    if (neko_bcknd_device .eq. 1) then
       call device_map(this%weights_r, this%weights_r_d, size_weights)
       call device_map(this%weights_s, this%weights_s_d, size_weights)
       call device_map(this%weights_t, this%weights_t_d, size_weights)
       call device_memcpy(this%weights_r, this%weights_r_d,&
            size_weights, host_to_device, sync = .true.)
       call device_memcpy(this%weights_s, this%weights_s_d,&
            size_weights, host_to_device, sync = .true.)
       call device_memcpy(this%weights_t, this%weights_t_d,&
            size_weights, host_to_device, sync = .true.)
    end if
 
  end subroutine local_interpolator_init
 
  subroutine local_interpolator_free(this)
    class(local_interpolator_t), intent(inout) :: this
 
    if (associated(this%Xh)) this%Xh => null()
 
    if(allocated(this%weights_r)) deallocate(this%weights_r)
    if(allocated(this%weights_s)) deallocate(this%weights_s)
    if(allocated(this%weights_t)) deallocate(this%weights_t)
    if (c_associated(this%weights_r_d)) then
       call device_free(this%weights_r_d)
    end if
    if (c_associated(this%weights_s_d)) then
       call device_free(this%weights_s_d)
    end if
    if (c_associated(this%weights_t_d)) then
       call device_free(this%weights_t_d)
    end if
  end subroutine local_interpolator_free
 
  subroutine local_interpolator_compute_weights(this, r, s, t)
    class(local_interpolator_t), intent(inout) :: this
    real(kind=rp), intent(in) :: r(:), s(:), t(:)
 
    integer :: N, i, lx
    lx = this%Xh%lx
    n = size(r)
 
    do i = 1, n
       call fd_weights_full(r(i), this%Xh%zg(:,1), lx-1, 0, this%weights_r(:,i))
       call fd_weights_full(s(i), this%Xh%zg(:,2), lx-1, 0, this%weights_s(:,i))
       call fd_weights_full(t(i), this%Xh%zg(:,3), lx-1, 0, this%weights_t(:,i))
    end do
 
  end subroutine local_interpolator_compute_weights
 
  subroutine local_interpolator_evaluate(this, interp_values, el_list, field,nel)
    class(local_interpolator_t), intent(inout) :: this
    integer, intent(in) :: el_list(this%n_points)
    integer, intent(in) :: nel
    real(kind=rp), intent(inout) :: interp_values(this%n_points)
    real(kind=rp), intent(inout) :: field(this%Xh%lxyz, nel)
 
 
    call tnsr3d_el_list(interp_values, 1, field, this%Xh%lx, &
         this%weights_r, this%weights_s, this%weights_t, el_list, this%n_points)
 
  end subroutine local_interpolator_evaluate
 
 
end module local_interpolation