Date: 2026-05-01T06:11:47+00:00

Actual source code: trigenerate.c

      1: #include <petsc/private/dmpleximpl.h>

      3: #if !defined(ANSI_DECLARATORS)
      4:   #define ANSI_DECLARATORS
      5: #endif
      6: #include <triangle.h>

      8: static PetscErrorCode InitInput_Triangle(struct triangulateio *inputCtx)
      9: {
     10:   PetscFunctionBegin;
     11:   inputCtx->numberofpoints             = 0;
     12:   inputCtx->numberofpointattributes    = 0;
     13:   inputCtx->pointlist                  = NULL;
     14:   inputCtx->pointattributelist         = NULL;
     15:   inputCtx->pointmarkerlist            = NULL;
     16:   inputCtx->numberofsegments           = 0;
     17:   inputCtx->segmentlist                = NULL;
     18:   inputCtx->segmentmarkerlist          = NULL;
     19:   inputCtx->numberoftriangleattributes = 0;
     20:   inputCtx->trianglelist               = NULL;
     21:   inputCtx->numberofholes              = 0;
     22:   inputCtx->holelist                   = NULL;
     23:   inputCtx->numberofregions            = 0;
     24:   inputCtx->regionlist                 = NULL;
     25:   PetscFunctionReturn(PETSC_SUCCESS);
     26: }

     28: static PetscErrorCode InitOutput_Triangle(struct triangulateio *outputCtx)
     29: {
     30:   PetscFunctionBegin;
     31:   outputCtx->numberofpoints        = 0;
     32:   outputCtx->pointlist             = NULL;
     33:   outputCtx->pointattributelist    = NULL;
     34:   outputCtx->pointmarkerlist       = NULL;
     35:   outputCtx->numberoftriangles     = 0;
     36:   outputCtx->trianglelist          = NULL;
     37:   outputCtx->triangleattributelist = NULL;
     38:   outputCtx->neighborlist          = NULL;
     39:   outputCtx->segmentlist           = NULL;
     40:   outputCtx->segmentmarkerlist     = NULL;
     41:   outputCtx->numberofedges         = 0;
     42:   outputCtx->edgelist              = NULL;
     43:   outputCtx->edgemarkerlist        = NULL;
     44:   PetscFunctionReturn(PETSC_SUCCESS);
     45: }

     47: static PetscErrorCode FiniOutput_Triangle(struct triangulateio *outputCtx)
     48: {
     49:   PetscFunctionBegin;
     50:   free(outputCtx->pointlist);
     51:   free(outputCtx->pointmarkerlist);
     52:   free(outputCtx->segmentlist);
     53:   free(outputCtx->segmentmarkerlist);
     54:   free(outputCtx->edgelist);
     55:   free(outputCtx->edgemarkerlist);
     56:   free(outputCtx->trianglelist);
     57:   free(outputCtx->neighborlist);
     58:   PetscFunctionReturn(PETSC_SUCCESS);
     59: }

     61: PETSC_EXTERN PetscErrorCode DMPlexGenerate_Triangle(DM boundary, PetscBool interpolate, DM *dm)
     62: {
     63:   MPI_Comm             comm;
     64:   DM_Plex             *mesh             = (DM_Plex *)boundary->data;
     65:   PetscInt             dim              = 2;
     66:   const PetscBool      createConvexHull = PETSC_FALSE;
     67:   const PetscBool      constrained      = PETSC_FALSE;
     68:   const char          *labelName        = "marker";
     69:   const char          *labelName2       = "Face Sets";
     70:   struct triangulateio in;
     71:   struct triangulateio out;
     72:   DMLabel              label, label2;
     73:   PetscInt             vStart, vEnd, v, eStart, eEnd, e;
     74:   PetscMPIInt          rank;
     75:   PetscBool            flg;
     76:   char                 opts[64];

     78:   PetscFunctionBegin;
     79:   PetscCall(PetscObjectGetComm((PetscObject)boundary, &comm));
     80:   PetscCallMPI(MPI_Comm_rank(comm, &rank));
     81:   PetscCall(InitInput_Triangle(&in));
     82:   PetscCall(InitOutput_Triangle(&out));
     83:   PetscCall(DMPlexGetDepthStratum(boundary, 0, &vStart, &vEnd));
     84:   PetscCall(DMGetLabel(boundary, labelName, &label));
     85:   PetscCall(DMGetLabel(boundary, labelName2, &label2));
     86:   PetscCall(PetscOptionsGetString(((PetscObject)boundary)->options, ((PetscObject)boundary)->prefix, "-dm_plex_generate_triangle_opts", opts, sizeof(opts), &flg));
     87:   if (flg) PetscCall(DMPlexTriangleSetOptions(boundary, opts));

     89:   PetscCall(PetscCIntCast(vEnd - vStart, &in.numberofpoints));
     90:   if (in.numberofpoints > 0) {
     91:     PetscSection coordSection;
     92:     Vec          coordinates;
     93:     PetscScalar *array;

     95:     PetscCall(PetscMalloc1(in.numberofpoints * dim, &in.pointlist));
     96:     PetscCall(PetscMalloc1(in.numberofpoints, &in.pointmarkerlist));
     97:     PetscCall(DMGetCoordinatesLocal(boundary, &coordinates));
     98:     PetscCall(DMGetCoordinateSection(boundary, &coordSection));
     99:     PetscCall(VecGetArray(coordinates, &array));
    100:     for (v = vStart; v < vEnd; ++v) {
    101:       const PetscInt idx = v - vStart;
    102:       PetscInt       val, off, d;

    104:       PetscCall(PetscSectionGetOffset(coordSection, v, &off));
    105:       for (d = 0; d < dim; ++d) in.pointlist[idx * dim + d] = PetscRealPart(array[off + d]);
    106:       if (label) {
    107:         PetscCall(DMLabelGetValue(label, v, &val));
    108:         PetscCall(PetscCIntCast(val, &in.pointmarkerlist[idx]));
    109:       }
    110:     }
    111:     PetscCall(VecRestoreArray(coordinates, &array));
    112:   }
    113:   PetscCall(DMPlexGetHeightStratum(boundary, 0, &eStart, &eEnd));
    114:   PetscCall(PetscCIntCast(eEnd - eStart, &in.numberofsegments));
    115:   if (in.numberofsegments > 0) {
    116:     PetscCall(PetscMalloc1(in.numberofsegments * 2, &in.segmentlist));
    117:     PetscCall(PetscMalloc1(in.numberofsegments, &in.segmentmarkerlist));
    118:     for (e = eStart; e < eEnd; ++e) {
    119:       const PetscInt  idx = e - eStart;
    120:       const PetscInt *cone;
    121:       PetscInt        val;

    123:       PetscCall(DMPlexGetCone(boundary, e, &cone));

    125:       PetscCall(PetscCIntCast(cone[0] - vStart, &in.segmentlist[idx * 2 + 0]));
    126:       PetscCall(PetscCIntCast(cone[1] - vStart, &in.segmentlist[idx * 2 + 1]));

    128:       if (label) {
    129:         PetscCall(DMLabelGetValue(label, e, &val));
    130:         PetscCall(PetscCIntCast(val, &in.segmentmarkerlist[idx]));
    131:       }
    132:     }
    133:   }
    134: #if 0 /* Do not currently support holes */
    135:   PetscReal *holeCoords;
    136:   PetscInt   h, d;

    138:   PetscCall(DMPlexGetHoles(boundary, &in.numberofholes, &holeCords));
    139:   if (in.numberofholes > 0) {
    140:     PetscCall(PetscMalloc1(in.numberofholes*dim, &in.holelist));
    141:     for (h = 0; h < in.numberofholes; ++h) {
    142:       for (d = 0; d < dim; ++d) in.holelist[h*dim+d] = holeCoords[h*dim+d];
    143:     }
    144:   }
    145: #endif
    146:   if (rank == 0) {
    147:     char args[32];

    149:     /* Take away 'Q' for verbose output */
    150:     PetscCall(PetscStrncpy(args, "pqezQ", sizeof(args)));
    151:     if (createConvexHull) PetscCall(PetscStrlcat(args, "c", sizeof(args)));
    152:     if (constrained) PetscCall(PetscStrncpy(args, "zepDQ", sizeof(args)));
    153:     if (mesh->triangleOpts) {
    154:       triangulate(mesh->triangleOpts, &in, &out, NULL);
    155:     } else {
    156:       triangulate(args, &in, &out, NULL);
    157:     }
    158:   }
    159:   PetscCall(PetscFree(in.pointlist));
    160:   PetscCall(PetscFree(in.pointmarkerlist));
    161:   PetscCall(PetscFree(in.segmentlist));
    162:   PetscCall(PetscFree(in.segmentmarkerlist));
    163:   PetscCall(PetscFree(in.holelist));

    165:   {
    166:     DMLabel        glabel      = NULL;
    167:     DMLabel        glabel2     = NULL;
    168:     const PetscInt numCorners  = 3;
    169:     const PetscInt numCells    = out.numberoftriangles;
    170:     const PetscInt numVertices = out.numberofpoints;
    171:     PetscInt      *cells;
    172:     PetscReal     *meshCoords;

    174:     if (sizeof(PetscReal) == sizeof(out.pointlist[0])) {
    175:       meshCoords = (PetscReal *)out.pointlist;
    176:     } else {
    177:       PetscInt i;

    179:       PetscCall(PetscMalloc1(dim * numVertices, &meshCoords));
    180:       for (i = 0; i < dim * numVertices; i++) meshCoords[i] = (PetscReal)out.pointlist[i];
    181:     }
    182:     if (sizeof(PetscInt) == sizeof(out.trianglelist[0])) {
    183:       cells = (PetscInt *)out.trianglelist;
    184:     } else {
    185:       PetscInt i;

    187:       PetscCall(PetscMalloc1(numCells * numCorners, &cells));
    188:       for (i = 0; i < numCells * numCorners; i++) cells[i] = (PetscInt)out.trianglelist[i];
    189:     }
    190:     PetscCall(DMPlexCreateFromCellListPetsc(comm, dim, numCells, numVertices, numCorners, interpolate, cells, dim, meshCoords, dm));
    191:     if (sizeof(PetscReal) != sizeof(out.pointlist[0])) PetscCall(PetscFree(meshCoords));
    192:     if (sizeof(PetscInt) != sizeof(out.trianglelist[0])) PetscCall(PetscFree(cells));
    193:     if (label) {
    194:       PetscCall(DMCreateLabel(*dm, labelName));
    195:       PetscCall(DMGetLabel(*dm, labelName, &glabel));
    196:     }
    197:     if (label2) {
    198:       PetscCall(DMCreateLabel(*dm, labelName2));
    199:       PetscCall(DMGetLabel(*dm, labelName2, &glabel2));
    200:     }
    201:     /* Set labels */
    202:     for (v = 0; v < numVertices; ++v) {
    203:       if (out.pointmarkerlist[v] && glabel) PetscCall(DMLabelSetValue(glabel, v + numCells, out.pointmarkerlist[v]));
    204:     }
    205:     if (interpolate) {
    206:       for (e = 0; e < out.numberofedges; e++) {
    207:         if (out.edgemarkerlist[e]) {
    208:           const PetscInt  vertices[2] = {out.edgelist[e * 2 + 0] + numCells, out.edgelist[e * 2 + 1] + numCells};
    209:           const PetscInt *edges;
    210:           PetscInt        numEdges;

    212:           PetscCall(DMPlexGetJoin(*dm, 2, vertices, &numEdges, &edges));
    213:           PetscCheck(numEdges == 1, PETSC_COMM_SELF, PETSC_ERR_PLIB, "Two vertices must cover only one edge, not %" PetscInt_FMT, numEdges);
    214:           if (glabel) PetscCall(DMLabelSetValue(glabel, edges[0], out.edgemarkerlist[e]));
    215:           if (glabel2) PetscCall(DMLabelSetValue(glabel2, edges[0], out.edgemarkerlist[e]));
    216:           PetscCall(DMPlexRestoreJoin(*dm, 2, vertices, &numEdges, &edges));
    217:         }
    218:       }
    219:     }
    220:     PetscCall(DMPlexSetRefinementUniform(*dm, PETSC_FALSE));
    221:   }
    222: #if 0 /* Do not currently support holes */
    223:   PetscCall(DMPlexCopyHoles(*dm, boundary));
    224: #endif
    225:   PetscCall(FiniOutput_Triangle(&out));
    226:   PetscFunctionReturn(PETSC_SUCCESS);
    227: }

    229: PETSC_EXTERN PetscErrorCode DMPlexRefine_Triangle(DM dm, PetscReal *inmaxVolumes, DM *dmRefined)
    230: {
    231:   MPI_Comm             comm;
    232:   PetscInt             dim       = 2;
    233:   const char          *labelName = "marker";
    234:   struct triangulateio in;
    235:   struct triangulateio out;
    236:   DMLabel              label;
    237:   PetscInt             vStart, vEnd, v, gcStart, cStart, cEnd, c, depth, depthGlobal;
    238:   PetscMPIInt          rank;
    239:   double              *maxVolumes;

    241:   PetscFunctionBegin;
    242:   PetscCall(PetscObjectGetComm((PetscObject)dm, &comm));
    243:   PetscCallMPI(MPI_Comm_rank(comm, &rank));
    244:   PetscCall(InitInput_Triangle(&in));
    245:   PetscCall(InitOutput_Triangle(&out));
    246:   PetscCall(DMPlexGetDepth(dm, &depth));
    247:   PetscCallMPI(MPIU_Allreduce(&depth, &depthGlobal, 1, MPIU_INT, MPI_MAX, comm));
    248:   PetscCall(DMPlexGetDepthStratum(dm, 0, &vStart, &vEnd));
    249:   PetscCall(DMGetLabel(dm, labelName, &label));

    251:   PetscCall(PetscCIntCast(vEnd - vStart, &in.numberofpoints));
    252:   if (in.numberofpoints > 0) {
    253:     PetscSection coordSection;
    254:     Vec          coordinates;
    255:     PetscScalar *array;

    257:     PetscCall(PetscMalloc1(in.numberofpoints * dim, &in.pointlist));
    258:     PetscCall(PetscMalloc1(in.numberofpoints, &in.pointmarkerlist));
    259:     PetscCall(DMGetCoordinatesLocal(dm, &coordinates));
    260:     PetscCall(DMGetCoordinateSection(dm, &coordSection));
    261:     PetscCall(VecGetArray(coordinates, &array));
    262:     for (v = vStart; v < vEnd; ++v) {
    263:       const PetscInt idx = v - vStart;
    264:       PetscInt       off, d, val;

    266:       PetscCall(PetscSectionGetOffset(coordSection, v, &off));
    267:       for (d = 0; d < dim; ++d) in.pointlist[idx * dim + d] = PetscRealPart(array[off + d]);
    268:       if (label) {
    269:         PetscCall(DMLabelGetValue(label, v, &val));
    270:         PetscCall(PetscCIntCast(val, &in.pointmarkerlist[idx]));
    271:       }
    272:     }
    273:     PetscCall(VecRestoreArray(coordinates, &array));
    274:   }
    275:   PetscCall(DMPlexGetHeightStratum(dm, 0, &cStart, &cEnd));
    276:   PetscCall(DMPlexGetCellTypeStratum(dm, DM_POLYTOPE_FV_GHOST, &gcStart, NULL));
    277:   if (gcStart >= 0) cEnd = gcStart;

    279:   in.numberofcorners = 3;
    280:   PetscCall(PetscCIntCast(cEnd - cStart, &in.numberoftriangles));

    282: #if !defined(PETSC_USE_REAL_DOUBLE)
    283:   PetscCall(PetscMalloc1(cEnd - cStart, &maxVolumes));
    284:   for (c = 0; c < cEnd - cStart; ++c) maxVolumes[c] = (double)inmaxVolumes[c];
    285: #else
    286:   maxVolumes = inmaxVolumes;
    287: #endif

    289:   in.trianglearealist = (double *)maxVolumes;
    290:   if (in.numberoftriangles > 0) {
    291:     PetscCall(PetscMalloc1(in.numberoftriangles * in.numberofcorners, &in.trianglelist));
    292:     for (c = cStart; c < cEnd; ++c) {
    293:       const PetscInt idx     = c - cStart;
    294:       PetscInt      *closure = NULL;
    295:       PetscInt       closureSize;

    297:       PetscCall(DMPlexGetTransitiveClosure(dm, c, PETSC_TRUE, &closureSize, &closure));
    298:       PetscCheck(!(closureSize != 4) || !(closureSize != 7), comm, PETSC_ERR_ARG_WRONG, "Mesh has cell which is not a triangle, %" PetscInt_FMT " vertices in closure", closureSize);
    299:       for (v = 0; v < 3; ++v) PetscCall(PetscCIntCast(closure[(v + closureSize - 3) * 2] - vStart, &in.trianglelist[idx * in.numberofcorners + v]));
    300:       PetscCall(DMPlexRestoreTransitiveClosure(dm, c, PETSC_TRUE, &closureSize, &closure));
    301:     }
    302:   }
    303:   /* TODO: Segment markers are missing on input */
    304: #if 0 /* Do not currently support holes */
    305:   PetscReal *holeCoords;
    306:   PetscInt   h, d;

    308:   PetscCall(DMPlexGetHoles(boundary, &in.numberofholes, &holeCords));
    309:   if (in.numberofholes > 0) {
    310:     PetscCall(PetscMalloc1(in.numberofholes*dim, &in.holelist));
    311:     for (h = 0; h < in.numberofholes; ++h) {
    312:       for (d = 0; d < dim; ++d) in.holelist[h*dim+d] = holeCoords[h*dim+d];
    313:     }
    314:   }
    315: #endif
    316:   if (rank == 0) {
    317:     char args[32];

    319:     /* Take away 'Q' for verbose output */
    320:     PetscCall(PetscStrncpy(args, "pqezQra", sizeof(args)));
    321:     triangulate(args, &in, &out, NULL);
    322:   }
    323:   PetscCall(PetscFree(in.pointlist));
    324:   PetscCall(PetscFree(in.pointmarkerlist));
    325:   PetscCall(PetscFree(in.segmentlist));
    326:   PetscCall(PetscFree(in.segmentmarkerlist));
    327:   PetscCall(PetscFree(in.trianglelist));

    329:   {
    330:     DMLabel        rlabel      = NULL;
    331:     const PetscInt numCorners  = 3;
    332:     const PetscInt numCells    = out.numberoftriangles;
    333:     const PetscInt numVertices = out.numberofpoints;
    334:     PetscInt      *cells;
    335:     PetscReal     *meshCoords;
    336:     PetscBool      interpolate = depthGlobal > 1 ? PETSC_TRUE : PETSC_FALSE;

    338:     if (sizeof(PetscReal) == sizeof(out.pointlist[0])) {
    339:       meshCoords = (PetscReal *)out.pointlist;
    340:     } else {
    341:       PetscInt i;

    343:       PetscCall(PetscMalloc1(dim * numVertices, &meshCoords));
    344:       for (i = 0; i < dim * numVertices; i++) meshCoords[i] = (PetscReal)out.pointlist[i];
    345:     }
    346:     if (sizeof(PetscInt) == sizeof(out.trianglelist[0])) {
    347:       cells = (PetscInt *)out.trianglelist;
    348:     } else {
    349:       PetscInt i;

    351:       PetscCall(PetscMalloc1(numCells * numCorners, &cells));
    352:       for (i = 0; i < numCells * numCorners; i++) cells[i] = (PetscInt)out.trianglelist[i];
    353:     }

    355:     PetscCall(DMPlexCreateFromCellListPetsc(comm, dim, numCells, numVertices, numCorners, interpolate, cells, dim, meshCoords, dmRefined));
    356:     if (label) {
    357:       PetscCall(DMCreateLabel(*dmRefined, labelName));
    358:       PetscCall(DMGetLabel(*dmRefined, labelName, &rlabel));
    359:     }
    360:     if (sizeof(PetscReal) != sizeof(out.pointlist[0])) PetscCall(PetscFree(meshCoords));
    361:     if (sizeof(PetscInt) != sizeof(out.trianglelist[0])) PetscCall(PetscFree(cells));
    362:     /* Set labels */
    363:     for (v = 0; v < numVertices; ++v) {
    364:       if (out.pointmarkerlist[v] && rlabel) PetscCall(DMLabelSetValue(rlabel, v + numCells, out.pointmarkerlist[v]));
    365:     }
    366:     if (interpolate) {
    367:       PetscInt e;

    369:       for (e = 0; e < out.numberofedges; e++) {
    370:         if (out.edgemarkerlist[e]) {
    371:           const PetscInt  vertices[2] = {out.edgelist[e * 2 + 0] + numCells, out.edgelist[e * 2 + 1] + numCells};
    372:           const PetscInt *edges;
    373:           PetscInt        numEdges;

    375:           PetscCall(DMPlexGetJoin(*dmRefined, 2, vertices, &numEdges, &edges));
    376:           PetscCheck(numEdges == 1, PETSC_COMM_SELF, PETSC_ERR_PLIB, "Two vertices must cover only one edge, not %" PetscInt_FMT, numEdges);
    377:           if (rlabel) PetscCall(DMLabelSetValue(rlabel, edges[0], out.edgemarkerlist[e]));
    378:           PetscCall(DMPlexRestoreJoin(*dmRefined, 2, vertices, &numEdges, &edges));
    379:         }
    380:       }
    381:     }
    382:     PetscCall(DMPlexSetRefinementUniform(*dmRefined, PETSC_FALSE));
    383:   }
    384: #if 0 /* Do not currently support holes */
    385:   PetscCall(DMPlexCopyHoles(*dm, boundary));
    386: #endif
    387:   PetscCall(FiniOutput_Triangle(&out));
    388: #if !defined(PETSC_USE_REAL_DOUBLE)
    389:   PetscCall(PetscFree(maxVolumes));
    390: #endif
    391:   PetscFunctionReturn(PETSC_SUCCESS);
    392: }