MappedGradient_MappedScalar3D Subroutine

  subroutine MappedGradient_MappedScalar3D(this,df)
  !! Calculates the gradient of a function using the strong form of the gradient
  !! in mapped coordinates.
    implicit none
    class(MappedScalar3D),intent(inout) :: this
    type(c_ptr),intent(out) :: df
    ! Local
    real(prec),pointer :: f_p(:,:,:,:,:,:)
    type(c_ptr) :: fc

    call ContravariantWeight_3D_gpu(this%interior_gpu, &
                                    this%geometry%dsdx%interior_gpu,this%jas_gpu, &
                                    this%interp%N,this%nvar,this%nelem)

    ! From Vector divergence
    call c_f_pointer(this%jas_gpu,f_p, &
                     [this%interp%N+1,this%interp%N+1,this%interp%N+1,this%nelem,3*this%nvar,3])

    fc = c_loc(f_p(1,1,1,1,1,1))
    call self_blas_matrixop_dim1_3d(this%interp%dMatrix_gpu,fc,df, &
                                    this%interp%N,this%interp%N,3*this%nvar,this%nelem,this%blas_handle)

    fc = c_loc(f_p(1,1,1,1,1,2))
    call self_blas_matrixop_dim2_3d(this%interp%dMatrix_gpu,fc,df, &
                                    1.0_c_prec,this%interp%N,this%interp%N,3*this%nvar,this%nelem,this%blas_handle)

    fc = c_loc(f_p(1,1,1,1,1,3))
    call self_blas_matrixop_dim3_3d(this%interp%dMatrix_gpu,fc,df, &
                                    1.0_c_prec,this%interp%N,this%interp%N,3*this%nvar,this%nelem,this%blas_handle)

    f_p => null()

    call JacobianWeight_3D_gpu(df,this%geometry%J%interior_gpu,this%N,3*this%nVar,this%nelem)

  endsubroutine MappedGradient_MappedScalar3D