1 #include <petsc/private/dmpleximpl.h> /*I "petscdmplex.h" I*/ 2 3 /*@C 4 DMPlexGetLocalOffsets - Allocate and populate array of local offsets. 5 6 Input Parameters: 7 dm - The DMPlex object 8 domain_label - label for DMPlex domain, or NULL for whole domain 9 label_value - Stratum value 10 height - Height of target cells in DMPlex topology 11 dm_field - Index of DMPlex field 12 13 Output Parameters: 14 num_cells - Number of local cells 15 cell_size - Size of each cell, given by cell_size * num_comp = num_dof 16 num_comp - Number of components per dof 17 l_size - Size of local vector 18 offsets - Allocated offsets array for cells 19 20 Notes: Allocate and populate array of shape [num_cells, cell_size] defining offsets for each value (cell, node) for local vector of the DMPlex field. All offsets are in the range [0, l_size - 1]. Caller is responsible for freeing the offsets array using PetscFree(). 21 22 Level: developer 23 24 .seealso: DMPlexGetClosureIndices(), DMPlexSetClosurePermutationTensor(), DMPlexGetCeedRestriction() 25 @*/ 26 PetscErrorCode DMPlexGetLocalOffsets(DM dm, DMLabel domain_label, PetscInt label_value, PetscInt height, PetscInt dm_field, PetscInt *num_cells, PetscInt *cell_size, PetscInt *num_comp, PetscInt *l_size, PetscInt **offsets) 27 { 28 PetscErrorCode ierr; 29 30 PetscFunctionBeginUser; 31 PetscValidHeaderSpecific(dm, DM_CLASSID, 1); 32 PetscDS ds = NULL; 33 PetscFE fe; 34 PetscSection section; 35 PetscInt dim, ds_field = -1; 36 PetscInt *restr_indices; 37 const PetscInt *iter_indices; 38 IS iter_is; 39 40 ierr = DMGetLocalSection(dm, §ion);CHKERRQ(ierr); 41 ierr = DMGetDimension(dm, &dim);CHKERRQ(ierr); 42 { 43 IS field_is; 44 const PetscInt *fields; 45 PetscInt num_fields; 46 ierr = DMGetRegionDS(dm, domain_label, &field_is, &ds);CHKERRQ(ierr); 47 // Translate dm_field to ds_field 48 ierr = ISGetIndices(field_is, &fields);CHKERRQ(ierr); 49 ierr = ISGetSize(field_is, &num_fields);CHKERRQ(ierr); 50 for (PetscInt i=0; i<num_fields; i++) { 51 if (dm_field == fields[i]) { 52 ds_field = i; 53 break; 54 } 55 } 56 ierr = ISRestoreIndices(field_is, &fields);CHKERRQ(ierr); 57 } 58 PetscCheckFalse(ds_field == -1,PetscObjectComm((PetscObject) dm), PETSC_ERR_SUP, "Could not find dm_field %D in DS", dm_field); 59 60 { 61 PetscInt depth; 62 DMLabel depth_label; 63 IS depth_is; 64 ierr = DMPlexGetDepth(dm, &depth);CHKERRQ(ierr); 65 ierr = DMPlexGetDepthLabel(dm, &depth_label);CHKERRQ(ierr); 66 ierr = DMLabelGetStratumIS(depth_label, depth - height, &depth_is);CHKERRQ(ierr); 67 if (domain_label) { 68 IS domain_is; 69 ierr = DMLabelGetStratumIS(domain_label, label_value, &domain_is);CHKERRQ(ierr); 70 if (domain_is) { // domainIS is non-empty 71 ierr = ISIntersect(depth_is, domain_is, &iter_is);CHKERRQ(ierr); 72 ierr = ISDestroy(&domain_is);CHKERRQ(ierr); 73 } else { // domainIS is NULL (empty) 74 iter_is = NULL; 75 } 76 ierr = ISDestroy(&depth_is);CHKERRQ(ierr); 77 } else { 78 iter_is = depth_is; 79 } 80 if (iter_is) { 81 ierr = ISGetLocalSize(iter_is, num_cells);CHKERRQ(ierr); 82 ierr = ISGetIndices(iter_is, &iter_indices);CHKERRQ(ierr); 83 } else { 84 *num_cells = 0; 85 iter_indices = NULL; 86 } 87 } 88 89 { 90 PetscDualSpace dual_space; 91 PetscInt num_dual_basis_vectors; 92 ierr = PetscDSGetDiscretization(ds, ds_field, (PetscObject*)&fe);CHKERRQ(ierr); 93 ierr = PetscFEGetHeightSubspace(fe, height, &fe);CHKERRQ(ierr); 94 ierr = PetscFEGetDualSpace(fe, &dual_space);CHKERRQ(ierr); 95 ierr = PetscDualSpaceGetDimension(dual_space, &num_dual_basis_vectors);CHKERRQ(ierr); 96 ierr = PetscDualSpaceGetNumComponents(dual_space, num_comp);CHKERRQ(ierr); 97 PetscCheckFalse(num_dual_basis_vectors % *num_comp != 0,PETSC_COMM_SELF, PETSC_ERR_SUP, "No support for number of dual basis vectors %D not divisible by %D components", num_dual_basis_vectors, *num_comp); 98 *cell_size = num_dual_basis_vectors / *num_comp; 99 } 100 PetscInt restr_size = (*num_cells)*(*cell_size); 101 ierr = PetscMalloc1(restr_size, &restr_indices);CHKERRQ(ierr); 102 PetscInt cell_offset = 0; 103 104 PetscInt P = (PetscInt) pow(*cell_size, 1.0 / (dim - height)); 105 for (PetscInt p = 0; p < *num_cells; p++) { 106 PetscBool flip = PETSC_FALSE; 107 PetscInt c = iter_indices[p]; 108 PetscInt num_indices, *indices; 109 PetscInt field_offsets[17]; // max number of fields plus 1 110 ierr = DMPlexGetClosureIndices(dm, section, section, c, PETSC_TRUE, &num_indices, &indices, field_offsets, NULL);CHKERRQ(ierr); 111 if (height > 0) { 112 PetscInt num_cells_support, num_faces, start = -1; 113 const PetscInt *orients, *faces, *cells; 114 ierr = DMPlexGetSupport(dm, c, &cells);CHKERRQ(ierr); 115 ierr = DMPlexGetSupportSize(dm, c, &num_cells_support);CHKERRQ(ierr); 116 PetscCheckFalse(num_cells_support != 1,PETSC_COMM_SELF, PETSC_ERR_ARG_INCOMP, "Expected one cell in support of exterior face, but got %D cells", num_cells_support); 117 ierr = DMPlexGetCone(dm, cells[0], &faces);CHKERRQ(ierr); 118 ierr = DMPlexGetConeSize(dm, cells[0], &num_faces);CHKERRQ(ierr); 119 for (PetscInt i=0; i<num_faces; i++) {if (faces[i] == c) start = i;} 120 PetscCheckFalse(start < 0,PETSC_COMM_SELF, PETSC_ERR_ARG_CORRUPT, "Could not find face %D in cone of its support", c); 121 ierr = DMPlexGetConeOrientation(dm, cells[0], &orients);CHKERRQ(ierr); 122 if (orients[start] < 0) flip = PETSC_TRUE; 123 } 124 125 for (PetscInt i = 0; i < *cell_size; i++) { 126 PetscInt ii = i; 127 if (flip) { 128 if (*cell_size == P) ii = *cell_size - 1 - i; 129 else if (*cell_size == P*P) { 130 PetscInt row = i / P, col = i % P; 131 ii = row + col * P; 132 } else SETERRQ(PETSC_COMM_SELF, PETSC_ERR_SUP, "No support for flipping point with cell size %D != P (%D) or P^2", *cell_size, P); 133 } 134 // Essential boundary conditions are encoded as -(loc+1), but we don't care so we decode. 135 PetscInt loc = indices[field_offsets[dm_field] + ii*(*num_comp)]; 136 restr_indices[cell_offset++] = loc >= 0 ? loc : -(loc + 1); 137 } 138 ierr = DMPlexRestoreClosureIndices(dm, section, section, c, PETSC_TRUE, &num_indices, &indices, field_offsets, NULL);CHKERRQ(ierr); 139 } 140 PetscCheckFalse(cell_offset != restr_size,PETSC_COMM_SELF, PETSC_ERR_SUP, "Shape mismatch, offsets array of shape (%D, %D) initialized for %D nodes", *num_cells, (*cell_size), cell_offset); 141 if (iter_is) { ierr = ISRestoreIndices(iter_is, &iter_indices);CHKERRQ(ierr); } 142 ierr = ISDestroy(&iter_is);CHKERRQ(ierr); 143 144 *offsets = restr_indices; 145 ierr = PetscSectionGetStorageSize(section, l_size);CHKERRQ(ierr); 146 PetscFunctionReturn(0); 147 } 148 149 #if defined(PETSC_HAVE_LIBCEED) 150 #include <petscdmplexceed.h> 151 152 /*@C 153 DMPlexGetCeedRestriction - Define the libCEED map from the local vector (Lvector) to the cells (Evector) 154 155 Input Parameters: 156 dm - The DMPlex object 157 domain_label - label for DMPlex domain, or NULL for the whole domain 158 label_value - Stratum value 159 height - Height of target cells in DMPlex topology 160 dm_field - Index of DMPlex field 161 162 Output Parameters: 163 ERestrict - libCEED restriction from local vector to to the cells 164 165 Level: developer 166 @*/ 167 PetscErrorCode DMPlexGetCeedRestriction(DM dm, DMLabel domain_label, PetscInt label_value, PetscInt height, PetscInt dm_field, CeedElemRestriction *ERestrict) 168 { 169 PetscErrorCode ierr; 170 171 PetscFunctionBeginUser; 172 PetscValidHeaderSpecific(dm, DM_CLASSID, 1); 173 PetscValidPointer(ERestrict, 2); 174 if (!dm->ceedERestrict) { 175 PetscInt num_cells, cell_size, num_comp, lvec_size, *restr_indices; 176 CeedElemRestriction elem_restr; 177 Ceed ceed; 178 179 ierr = DMPlexGetLocalOffsets(dm, domain_label, label_value, height, dm_field, &num_cells, &cell_size, &num_comp, &lvec_size, &restr_indices);CHKERRQ(ierr); 180 ierr = DMGetCeed(dm, &ceed);CHKERRQ(ierr); 181 ierr = CeedElemRestrictionCreate(ceed, num_cells, cell_size, num_comp, 1, lvec_size, CEED_MEM_HOST, CEED_COPY_VALUES, restr_indices, &elem_restr);CHKERRQ_CEED(ierr); 182 ierr = PetscFree(restr_indices);CHKERRQ(ierr); 183 dm->ceedERestrict = elem_restr; 184 } 185 *ERestrict = dm->ceedERestrict; 186 PetscFunctionReturn(0); 187 } 188 189 #endif 190