!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer, 
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms 
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer 
!version 3 or (at your option) any later version that should be found at: 
!http://collaboration.cmc.ec.gc.ca/science/rpn.comm/license.html 
!
!This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
!without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
!See the above mentioned License/Disclaimer for more details.
!You should have received a copy of the License/Disclaimer along with this software; 
!if not, you can write to: EC-RPN COMM Group, 2121 TransCanada, suite 500, Dorval (Quebec), 
!CANADA, H9P 1J3; or send e-mail to service.rpn@ec.gc.ca
!-------------------------------------- LICENCE END --------------------------------------
***s/r vspng_lam
*
#include "model_macros_f.h"
*

      subroutine vspng_lam ( F_champ, DIST_DIM, pni, pnj ) 42
#include "impnone.cdk"
*
      integer DIST_DIM,pni,pnj
      real F_champ(DIST_SHAPE,*)
*
*author   Claude Girard                         Sept  2002
*
*revision
* v3_02 - Lee V.          - initial version (from MC2 topspng2+smth2d)
*
*object
*     This routine iterates around a 9 points horizontal filter
**
*implicit
#include "glb_ld.cdk"
#include "glb_pil.cdk"
#include "vspng.cdk"
*
      integer i,j,k,iter,i0,in,j0,jn
      real*8 c1,c2,c3,one,two,four
      parameter(one=1.d0,two=2.d0,four=4.d0)
      real wk(l_ni,l_nj,G_nk)
 
*---------------------------------------------------------------------
*
      i0=1
      in=l_niu
      j0=1
      jn=l_njv
      if (l_south) j0=2
      if (l_north) jn=l_njv-1
      if (l_west)  i0=2
      if (l_east)  in=l_niu-1
      do iter = 1, Vspng_niter
*
         call rpn_comm_xch_halo (F_champ,LDIST_DIM,pni,pnj,
     $                 G_nk,G_halox,G_haloy,G_periodx,G_periody,l_ni,0)
*
         do k=1,Vspng_nk
            c1= (one-two*Vspng_nu(k))*Vspng_nu(k)
            c2= Vspng_nu(k)**two
            c3= four*(Vspng_nu(k)-one)*Vspng_nu(k)
            do j=j0,jn
            do i=i0,in
               wk(i,j,k)= c1*(F_champ(i  ,j+1,k)+F_champ(i+1,j  ,k) +
     $                        F_champ(i  ,j-1,k)+F_champ(i-1,j  ,k))+
     $                    c2*(F_champ(i-1,j+1,k)+F_champ(i+1,j+1,k) +
     $                        F_champ(i-1,j-1,k)+F_champ(i+1,j-1,k))+
     $                    c3* F_champ(i  ,j  ,k)
            end do
            end do
            do j=1+pil_s, l_nj-pil_n
            do i=1+pil_w, l_ni-pil_e
               F_champ(i,j,k)= F_champ(i,j,k) + wk(i,j,k)
            end do
            end do
         end do
*
      end do
*
*----------------------------------------------------------------------
      return
      end