elementwise_filter.f90

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module elementwise_filter
  use num_types, only : rp
  use math, only : rzero, rone
  use field, only : field_t
  use utils, only : neko_error
  use neko_config, only : neko_bcknd_device
  use elementwise_filter_cpu
  use tensor, only : tnsr3d
  use device, only : device_map, device_free, c_ptr, &
                    c_null_ptr, device_memcpy, host_to_device
  use device_math, only : device_cfill
  use, intrinsic :: iso_c_binding
  implicit none
  private
 
  type, public :: elementwise_filter_t
     character(len=64) :: filter_type
     integer :: nx
     integer :: nt
     real(kind=rp), allocatable :: fh(:,:), fht(:,:)
     type(c_ptr) :: fh_d = c_null_ptr
     type(c_ptr) :: fht_d = c_null_ptr
     real(kind=rp), allocatable :: trnsfr(:)
   contains
     procedure, pass(this) :: init => elementwise_filter_init
     procedure, pass(this) :: free => elementwise_filter_free
     procedure, pass(this) :: build_1d
     procedure, pass(this) :: filter_3d => elementwise_field_filter_3d
  end type elementwise_filter_t
 
contains
  subroutine elementwise_filter_init(this, nx, filter_type)
    class(elementwise_filter_t), intent(inout) :: this
    character(len=*) :: filter_type
    integer :: nx
    
    this%nx = nx
    this%nt = nx ! initialize as if nothing is filtered yet 
    this%filter_type = filter_type
 
    allocate(this%fh(nx, nx))
    allocate(this%fht(nx, nx))
    allocate(this%trnsfr(nx))
 
    call rzero(this%fh, nx*nx)
    call rzero(this%fht, nx*nx)
    call rone(this%trnsfr, nx) ! initialize as if nothing is filtered yet
 
    if (neko_bcknd_device .eq. 1) then
       call device_map(this%fh, this%fh_d, this%nx * this%nx)
       call device_map(this%fht, this%fht_d, this%nx * this%nx)
       call device_cfill(this%fh_d, 0.0_rp, this%nx * this%nx)
       call device_cfill(this%fht_d, 0.0_rp, this%nx * this%nx)
    end if
    
  end subroutine elementwise_filter_init
 
  subroutine elementwise_filter_free(this)
    class(elementwise_filter_t), intent(inout) :: this
 
    if (allocated(this%fh)) then
       deallocate(this%fh)
    end if
 
    if (allocated(this%fht)) then
       deallocate(this%fht)
    end if
 
    if (allocated(this%trnsfr)) then
       deallocate(this%trnsfr)
    end if
 
    if (c_associated(this%fh_d)) then
       call device_free(this%fh_d)
    end if
 
    if (c_associated(this%fht_d)) then
       call device_free(this%fht_d)
    end if
 
    this%filter_type = ""
    this%nx = 0
    this%nt = 0
 
  end subroutine elementwise_filter_free
 
  subroutine build_1d(this)
    class(elementwise_filter_t), intent(inout) :: this
 
    call build_1d_cpu(this%fh, this%fht, this%trnsfr, &
                               this%nx, this%filter_type)
    if (neko_bcknd_device .eq. 1) then
       call device_memcpy(this%fh, this%fh_d, &
                          this%nx * this%nx, host_to_device, sync = .false.)
       call device_memcpy(this%fht, this%fht_d, &
                          this%nx * this%nx, host_to_device, sync = .false.)
    end if
 
  end subroutine build_1d
 
  subroutine elementwise_field_filter_3d(this, v, u, nelv)
    class(elementwise_filter_t), intent(in) :: this
    integer, intent(inout) :: nelv
    real(kind=rp), intent(inout), dimension(this%nx, this%nx, this%nx, nelv) :: v
    real(kind=rp), intent(in), dimension(this%nx, this%nx, this%nx, nelv) :: u
 
    ! v = fh x fh x fh x u
    call tnsr3d(v, this%nx, u, this%nx, this%fh, this%fht, this%fht, nelv)
 
  end subroutine elementwise_field_filter_3d
 
end module elementwise_filter