1: #include <petsc/private/dmpatchimpl.h>
  2: #include <petscdmda.h>

  4: static PetscErrorCode DMSetFromOptions_Patch(DM dm, PetscOptionItems *PetscOptionsObject)
  5: {
  6:   /* DM_Patch      *mesh = (DM_Patch*) dm->data; */

  8:   PetscFunctionBegin;
  9:   PetscOptionsHeadBegin(PetscOptionsObject, "DMPatch Options");
 10:   /* Handle associated vectors */
 11:   /* Handle viewing */
 12:   PetscOptionsHeadEnd();
 13:   PetscFunctionReturn(PETSC_SUCCESS);
 14: }

 16: /* External function declarations here */
 17: extern PetscErrorCode DMSetUp_Patch(DM dm);
 18: extern PetscErrorCode DMView_Patch(DM dm, PetscViewer viewer);
 19: extern PetscErrorCode DMCreateGlobalVector_Patch(DM dm, Vec *g);
 20: extern PetscErrorCode DMCreateLocalVector_Patch(DM dm, Vec *l);
 21: extern PetscErrorCode DMDestroy_Patch(DM dm);
 22: extern PetscErrorCode DMCreateSubDM_Patch(DM dm, PetscInt numFields, const PetscInt fields[], IS *is, DM *subdm);

 24: static PetscErrorCode DMInitialize_Patch(DM dm)
 25: {
 26:   PetscFunctionBegin;
 27:   dm->ops->view                    = DMView_Patch;
 28:   dm->ops->setfromoptions          = DMSetFromOptions_Patch;
 29:   dm->ops->setup                   = DMSetUp_Patch;
 30:   dm->ops->createglobalvector      = DMCreateGlobalVector_Patch;
 31:   dm->ops->createlocalvector       = DMCreateLocalVector_Patch;
 32:   dm->ops->getlocaltoglobalmapping = NULL;
 33:   dm->ops->createfieldis           = NULL;
 34:   dm->ops->getcoloring             = NULL;
 35:   dm->ops->creatematrix            = NULL;
 36:   dm->ops->createinterpolation     = NULL;
 37:   dm->ops->createinjection         = NULL;
 38:   dm->ops->refine                  = NULL;
 39:   dm->ops->coarsen                 = NULL;
 40:   dm->ops->refinehierarchy         = NULL;
 41:   dm->ops->coarsenhierarchy        = NULL;
 42:   dm->ops->globaltolocalbegin      = NULL;
 43:   dm->ops->globaltolocalend        = NULL;
 44:   dm->ops->localtoglobalbegin      = NULL;
 45:   dm->ops->localtoglobalend        = NULL;
 46:   dm->ops->destroy                 = DMDestroy_Patch;
 47:   dm->ops->createsubdm             = DMCreateSubDM_Patch;
 48:   PetscFunctionReturn(PETSC_SUCCESS);
 49: }

 51: PETSC_EXTERN PetscErrorCode DMCreate_Patch(DM dm)
 52: {
 53:   DM_Patch *mesh;

 55:   PetscFunctionBegin;
 57:   PetscCall(PetscNew(&mesh));
 58:   dm->data = mesh;

 60:   mesh->refct       = 1;
 61:   mesh->dmCoarse    = NULL;
 62:   mesh->patchSize.i = 0;
 63:   mesh->patchSize.j = 0;
 64:   mesh->patchSize.k = 0;
 65:   mesh->patchSize.c = 0;

 67:   PetscCall(DMInitialize_Patch(dm));
 68:   PetscFunctionReturn(PETSC_SUCCESS);
 69: }

 71: /*@
 72:   DMPatchCreate - Creates a DMPatch object, which is a collections of DMs called patches.

 74:   Collective

 76:   Input Parameter:
 77: . comm - The communicator for the DMPatch object

 79:   Output Parameter:
 80: . mesh - The DMPatch object

 82:   Notes:

 84:   This code is incomplete and not used by other parts of PETSc.

 86:   Level: beginner

 88: .seealso: `DMPatchZoom()`

 90: @*/
 91: PetscErrorCode DMPatchCreate(MPI_Comm comm, DM *mesh)
 92: {
 93:   PetscFunctionBegin;
 94:   PetscAssertPointer(mesh, 2);
 95:   PetscCall(DMCreate(comm, mesh));
 96:   PetscCall(DMSetType(*mesh, DMPATCH));
 97:   PetscFunctionReturn(PETSC_SUCCESS);
 98: }

100: PetscErrorCode DMPatchCreateGrid(MPI_Comm comm, PetscInt dim, MatStencil patchSize, MatStencil commSize, MatStencil gridSize, DM *dm)
101: {
102:   DM_Patch *mesh;
103:   DM        da;
104:   PetscInt  dof = 1, width = 1;

106:   PetscFunctionBegin;
107:   PetscCall(DMPatchCreate(comm, dm));
108:   mesh = (DM_Patch *)(*dm)->data;
109:   if (dim < 2) {
110:     gridSize.j  = 1;
111:     patchSize.j = 1;
112:   }
113:   if (dim < 3) {
114:     gridSize.k  = 1;
115:     patchSize.k = 1;
116:   }
117:   PetscCall(DMCreate(comm, &da));
118:   PetscCall(DMSetType(da, DMDA));
119:   PetscCall(DMSetDimension(da, dim));
120:   PetscCall(DMDASetSizes(da, gridSize.i, gridSize.j, gridSize.k));
121:   PetscCall(DMDASetBoundaryType(da, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE));
122:   PetscCall(DMDASetDof(da, dof));
123:   PetscCall(DMDASetStencilType(da, DMDA_STENCIL_BOX));
124:   PetscCall(DMDASetStencilWidth(da, width));

126:   mesh->dmCoarse = da;

128:   PetscCall(DMPatchSetPatchSize(*dm, patchSize));
129:   PetscCall(DMPatchSetCommSize(*dm, commSize));
130:   PetscFunctionReturn(PETSC_SUCCESS);
131: }