1: #if !defined(DMSTAGIMPL_H_)
  2: #define DMSTAGIMPL_H_

  4:  #include <petscdmstag.h>
  5:  #include <petsc/private/dmimpl.h>

  7: #define DMSTAG_MAX_DIM 3
  8: #define DMSTAG_MAX_STRATA DMSTAG_MAX_DIM + 1

 10: /* This value is 1 + 3^DMSTAG_MAX DIM */
 11: #define DMSTAG_NUMBER_LOCATIONS 28

 13: typedef struct {
 14:   /* Fields which may require being set before DMSetUp() is called */
 15:   PetscInt          N[DMSTAG_MAX_DIM];            /* Global dimensions (elements)      */
 16:   PetscInt          n[DMSTAG_MAX_DIM];            /* Local dimensions (elements)       */
 17:   PetscInt          dof[DMSTAG_MAX_STRATA];       /* Dof per point for each stratum    */
 18:   DMStagStencilType stencilType;                  /* Elementwise stencil type          */
 19:   PetscInt          stencilWidth;                 /* Elementwise ghost width           */
 20:   DMBoundaryType    boundaryType[DMSTAG_MAX_DIM]; /* Physical domain ghosting type     */
 21:   PetscInt          nRanks[DMSTAG_MAX_DIM];       /* Ranks in each direction           */

 23:   /* Additional fields populated by DMSetUp() */
 24:   PetscInt          nGhost[DMSTAG_MAX_DIM];       /* Local dimensions (w/ ghosts)      */
 25:   PetscInt          start[DMSTAG_MAX_DIM];        /* First element number              */
 26:   PetscInt          startGhost[DMSTAG_MAX_DIM];   /* First element number (w/ ghosts)  */
 27:   PetscMPIInt       rank[DMSTAG_MAX_DIM];         /* Location in grid of ranks         */
 28:   PetscMPIInt       *neighbors;                   /* dim^3 local ranks                 */
 29:   PetscInt          *l[DMSTAG_MAX_DIM];           /* Elements/rank in each direction   */
 30:   VecScatter        gton;                         /* Global --> Natural                */
 31:   VecScatter        gtol;                         /* Global --> Local                  */
 32:   PetscInt          *locationOffsets;             /* Offsets for points in loc. rep.   */

 34:   /* Coordinates */
 35:   DMType            coordinateDMType;             /* DM type to create for coordinates */

 37:   /* Convenience (easily computed from the above) */
 38:   PetscInt          entriesPerElement;            /* Entries stored with each element   */
 39:   PetscInt          entries;                      /* Local number of entries            */
 40:   PetscInt          entriesGhost;                 /* Local numbers of entries w/ ghosts */
 41:   PetscBool         firstRank[DMSTAG_MAX_DIM];    /* First rank in this dim?            */
 42:   PetscBool         lastRank[DMSTAG_MAX_DIM];     /* Last rank in this dim?             */
 43: } DM_Stag;

 45: PETSC_INTERN PetscErrorCode DMSetUp_Stag_1d(DM);
 46: PETSC_INTERN PetscErrorCode DMSetUp_Stag_2d(DM);
 47: PETSC_INTERN PetscErrorCode DMSetUp_Stag_3d(DM);
 48: PETSC_INTERN PetscErrorCode DMStagSetUniformCoordinatesExplicit_1d(DM,PetscReal,PetscReal);
 49: PETSC_INTERN PetscErrorCode DMStagSetUniformCoordinatesExplicit_2d(DM,PetscReal,PetscReal,PetscReal,PetscReal);
 50: PETSC_INTERN PetscErrorCode DMStagSetUniformCoordinatesExplicit_3d(DM,PetscReal,PetscReal,PetscReal,PetscReal,PetscReal,PetscReal);

 52: #endif