fld_file_output.f90

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module fld_file_output
  use num_types, only : rp
  use field_list, only : field_list_t
  use neko_config, only : neko_bcknd_device
  use device, only : device_memcpy, device_to_host
  use output, only : output_t
  implicit none
  private
 
  type, public, extends(output_t) :: fld_file_output_t
     ! The list of fields to save.
     type(field_list_t) :: fields
   contains
     ! Constructor.
     procedure, pass(this) :: init => fld_file_output_init
     ! Writes the data.
     procedure, pass(this) :: sample => fld_file_output_sample
  end type fld_file_output_t
 
contains
 
  subroutine fld_file_output_init(this, precision, name, nfields, path)
    class(fld_file_output_t), intent (inout) :: this
    integer, intent(in) :: precision
    character(len=*), intent(in) :: name
    character(len=*), intent(in), optional :: path
    integer, intent(in) :: nfields
    character(len=1024) :: fname
 
    if (present(path)) then
       fname = trim(path) // trim(name) // '.fld'
    else
       fname = trim(name) // '.fld'
    end if
 
    call this%init_base(fname, precision)
 
    if (allocated(this%fields%fields)) then
       deallocate(this%fields%fields)
    end if
 
    allocate(this%fields%fields(nfields))
 
   end subroutine fld_file_output_init
 
  subroutine fld_file_output_sample(this, t)
    class(fld_file_output_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer :: i
 
    if (neko_bcknd_device .eq. 1) then
       associate(fields => this%fields%fields)
         do i = 1, size(fields)
            call device_memcpy(fields(i)%f%x, fields(i)%f%x_d, &
                 fields(i)%f%dof%size(), device_to_host, &
                 sync=(i .eq. size(fields))) ! Sync on the last field
         end do
       end associate
 
    end if
 
    call this%file_%write(this%fields, t)
 
  end subroutine fld_file_output_sample
 
end module fld_file_output