xref: /petsc/src/dm/impls/plex/generators/triangle/trigenerate.c (revision ccfb0f9f40a0131988d7995ed9679700dae2a75a) 
1 #include <petsc/private/dmpleximpl.h> /*I      "petscdmplex.h"   I*/
2 
3 #if !defined(ANSI_DECLARATORS)
4   #define ANSI_DECLARATORS
5 #endif
6 #include <triangle.h>
7 
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 }
27 
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 }
46 
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 }
60 
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];
77 
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));
88 
89   PetscCall(PetscCIntCast(vEnd - vStart, &in.numberofpoints));
90   if (in.numberofpoints > 0) {
91     PetscSection coordSection;
92     Vec          coordinates;
93     PetscScalar *array;
94 
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;
103 
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;
122 
123       PetscCall(DMPlexGetCone(boundary, e, &cone));
124 
125       PetscCall(PetscCIntCast(cone[0] - vStart, &in.segmentlist[idx * 2 + 0]));
126       PetscCall(PetscCIntCast(cone[1] - vStart, &in.segmentlist[idx * 2 + 1]));
127 
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;
137 
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];
148 
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));
164 
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;
173 
174     if (sizeof(PetscReal) == sizeof(out.pointlist[0])) {
175       meshCoords = (PetscReal *)out.pointlist;
176     } else {
177       PetscInt i;
178 
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;
186 
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]) {
204         if (glabel) PetscCall(DMLabelSetValue(glabel, v + numCells, out.pointmarkerlist[v]));
205       }
206     }
207     if (interpolate) {
208       for (e = 0; e < out.numberofedges; e++) {
209         if (out.edgemarkerlist[e]) {
210           const PetscInt  vertices[2] = {out.edgelist[e * 2 + 0] + numCells, out.edgelist[e * 2 + 1] + numCells};
211           const PetscInt *edges;
212           PetscInt        numEdges;
213 
214           PetscCall(DMPlexGetJoin(*dm, 2, vertices, &numEdges, &edges));
215           PetscCheck(numEdges == 1, PETSC_COMM_SELF, PETSC_ERR_PLIB, "Two vertices must cover only one edge, not %" PetscInt_FMT, numEdges);
216           if (glabel) PetscCall(DMLabelSetValue(glabel, edges[0], out.edgemarkerlist[e]));
217           if (glabel2) PetscCall(DMLabelSetValue(glabel2, edges[0], out.edgemarkerlist[e]));
218           PetscCall(DMPlexRestoreJoin(*dm, 2, vertices, &numEdges, &edges));
219         }
220       }
221     }
222     PetscCall(DMPlexSetRefinementUniform(*dm, PETSC_FALSE));
223   }
224 #if 0 /* Do not currently support holes */
225   PetscCall(DMPlexCopyHoles(*dm, boundary));
226 #endif
227   PetscCall(FiniOutput_Triangle(&out));
228   PetscFunctionReturn(PETSC_SUCCESS);
229 }
230 
231 PETSC_EXTERN PetscErrorCode DMPlexRefine_Triangle(DM dm, PetscReal *inmaxVolumes, DM *dmRefined)
232 {
233   MPI_Comm             comm;
234   PetscInt             dim       = 2;
235   const char          *labelName = "marker";
236   struct triangulateio in;
237   struct triangulateio out;
238   DMLabel              label;
239   PetscInt             vStart, vEnd, v, gcStart, cStart, cEnd, c, depth, depthGlobal;
240   PetscMPIInt          rank;
241   double              *maxVolumes;
242 
243   PetscFunctionBegin;
244   PetscCall(PetscObjectGetComm((PetscObject)dm, &comm));
245   PetscCallMPI(MPI_Comm_rank(comm, &rank));
246   PetscCall(InitInput_Triangle(&in));
247   PetscCall(InitOutput_Triangle(&out));
248   PetscCall(DMPlexGetDepth(dm, &depth));
249   PetscCallMPI(MPIU_Allreduce(&depth, &depthGlobal, 1, MPIU_INT, MPI_MAX, comm));
250   PetscCall(DMPlexGetDepthStratum(dm, 0, &vStart, &vEnd));
251   PetscCall(DMGetLabel(dm, labelName, &label));
252 
253   PetscCall(PetscCIntCast(vEnd - vStart, &in.numberofpoints));
254   if (in.numberofpoints > 0) {
255     PetscSection coordSection;
256     Vec          coordinates;
257     PetscScalar *array;
258 
259     PetscCall(PetscMalloc1(in.numberofpoints * dim, &in.pointlist));
260     PetscCall(PetscMalloc1(in.numberofpoints, &in.pointmarkerlist));
261     PetscCall(DMGetCoordinatesLocal(dm, &coordinates));
262     PetscCall(DMGetCoordinateSection(dm, &coordSection));
263     PetscCall(VecGetArray(coordinates, &array));
264     for (v = vStart; v < vEnd; ++v) {
265       const PetscInt idx = v - vStart;
266       PetscInt       off, d, val;
267 
268       PetscCall(PetscSectionGetOffset(coordSection, v, &off));
269       for (d = 0; d < dim; ++d) in.pointlist[idx * dim + d] = PetscRealPart(array[off + d]);
270       if (label) {
271         PetscCall(DMLabelGetValue(label, v, &val));
272         PetscCall(PetscCIntCast(val, &in.pointmarkerlist[idx]));
273       }
274     }
275     PetscCall(VecRestoreArray(coordinates, &array));
276   }
277   PetscCall(DMPlexGetHeightStratum(dm, 0, &cStart, &cEnd));
278   PetscCall(DMPlexGetCellTypeStratum(dm, DM_POLYTOPE_FV_GHOST, &gcStart, NULL));
279   if (gcStart >= 0) cEnd = gcStart;
280 
281   in.numberofcorners = 3;
282   PetscCall(PetscCIntCast(cEnd - cStart, &in.numberoftriangles));
283 
284 #if !defined(PETSC_USE_REAL_DOUBLE)
285   PetscCall(PetscMalloc1(cEnd - cStart, &maxVolumes));
286   for (c = 0; c < cEnd - cStart; ++c) maxVolumes[c] = (double)inmaxVolumes[c];
287 #else
288   maxVolumes = inmaxVolumes;
289 #endif
290 
291   in.trianglearealist = (double *)maxVolumes;
292   if (in.numberoftriangles > 0) {
293     PetscCall(PetscMalloc1(in.numberoftriangles * in.numberofcorners, &in.trianglelist));
294     for (c = cStart; c < cEnd; ++c) {
295       const PetscInt idx     = c - cStart;
296       PetscInt      *closure = NULL;
297       PetscInt       closureSize;
298 
299       PetscCall(DMPlexGetTransitiveClosure(dm, c, PETSC_TRUE, &closureSize, &closure));
300       PetscCheck(!(closureSize != 4) || !(closureSize != 7), comm, PETSC_ERR_ARG_WRONG, "Mesh has cell which is not a triangle, %" PetscInt_FMT " vertices in closure", closureSize);
301       for (v = 0; v < 3; ++v) PetscCall(PetscCIntCast(closure[(v + closureSize - 3) * 2] - vStart, &in.trianglelist[idx * in.numberofcorners + v]));
302       PetscCall(DMPlexRestoreTransitiveClosure(dm, c, PETSC_TRUE, &closureSize, &closure));
303     }
304   }
305   /* TODO: Segment markers are missing on input */
306 #if 0 /* Do not currently support holes */
307   PetscReal *holeCoords;
308   PetscInt   h, d;
309 
310   PetscCall(DMPlexGetHoles(boundary, &in.numberofholes, &holeCords));
311   if (in.numberofholes > 0) {
312     PetscCall(PetscMalloc1(in.numberofholes*dim, &in.holelist));
313     for (h = 0; h < in.numberofholes; ++h) {
314       for (d = 0; d < dim; ++d) in.holelist[h*dim+d] = holeCoords[h*dim+d];
315     }
316   }
317 #endif
318   if (rank == 0) {
319     char args[32];
320 
321     /* Take away 'Q' for verbose output */
322     PetscCall(PetscStrncpy(args, "pqezQra", sizeof(args)));
323     triangulate(args, &in, &out, NULL);
324   }
325   PetscCall(PetscFree(in.pointlist));
326   PetscCall(PetscFree(in.pointmarkerlist));
327   PetscCall(PetscFree(in.segmentlist));
328   PetscCall(PetscFree(in.segmentmarkerlist));
329   PetscCall(PetscFree(in.trianglelist));
330 
331   {
332     DMLabel        rlabel      = NULL;
333     const PetscInt numCorners  = 3;
334     const PetscInt numCells    = out.numberoftriangles;
335     const PetscInt numVertices = out.numberofpoints;
336     PetscInt      *cells;
337     PetscReal     *meshCoords;
338     PetscBool      interpolate = depthGlobal > 1 ? PETSC_TRUE : PETSC_FALSE;
339 
340     if (sizeof(PetscReal) == sizeof(out.pointlist[0])) {
341       meshCoords = (PetscReal *)out.pointlist;
342     } else {
343       PetscInt i;
344 
345       PetscCall(PetscMalloc1(dim * numVertices, &meshCoords));
346       for (i = 0; i < dim * numVertices; i++) meshCoords[i] = (PetscReal)out.pointlist[i];
347     }
348     if (sizeof(PetscInt) == sizeof(out.trianglelist[0])) {
349       cells = (PetscInt *)out.trianglelist;
350     } else {
351       PetscInt i;
352 
353       PetscCall(PetscMalloc1(numCells * numCorners, &cells));
354       for (i = 0; i < numCells * numCorners; i++) cells[i] = (PetscInt)out.trianglelist[i];
355     }
356 
357     PetscCall(DMPlexCreateFromCellListPetsc(comm, dim, numCells, numVertices, numCorners, interpolate, cells, dim, meshCoords, dmRefined));
358     if (label) {
359       PetscCall(DMCreateLabel(*dmRefined, labelName));
360       PetscCall(DMGetLabel(*dmRefined, labelName, &rlabel));
361     }
362     if (sizeof(PetscReal) != sizeof(out.pointlist[0])) PetscCall(PetscFree(meshCoords));
363     if (sizeof(PetscInt) != sizeof(out.trianglelist[0])) PetscCall(PetscFree(cells));
364     /* Set labels */
365     for (v = 0; v < numVertices; ++v) {
366       if (out.pointmarkerlist[v]) {
367         if (rlabel) PetscCall(DMLabelSetValue(rlabel, v + numCells, out.pointmarkerlist[v]));
368       }
369     }
370     if (interpolate) {
371       PetscInt e;
372 
373       for (e = 0; e < out.numberofedges; e++) {
374         if (out.edgemarkerlist[e]) {
375           const PetscInt  vertices[2] = {out.edgelist[e * 2 + 0] + numCells, out.edgelist[e * 2 + 1] + numCells};
376           const PetscInt *edges;
377           PetscInt        numEdges;
378 
379           PetscCall(DMPlexGetJoin(*dmRefined, 2, vertices, &numEdges, &edges));
380           PetscCheck(numEdges == 1, PETSC_COMM_SELF, PETSC_ERR_PLIB, "Two vertices must cover only one edge, not %" PetscInt_FMT, numEdges);
381           if (rlabel) PetscCall(DMLabelSetValue(rlabel, edges[0], out.edgemarkerlist[e]));
382           PetscCall(DMPlexRestoreJoin(*dmRefined, 2, vertices, &numEdges, &edges));
383         }
384       }
385     }
386     PetscCall(DMPlexSetRefinementUniform(*dmRefined, PETSC_FALSE));
387   }
388 #if 0 /* Do not currently support holes */
389   PetscCall(DMPlexCopyHoles(*dm, boundary));
390 #endif
391   PetscCall(FiniOutput_Triangle(&out));
392 #if !defined(PETSC_USE_REAL_DOUBLE)
393   PetscCall(PetscFree(maxVolumes));
394 #endif
395   PetscFunctionReturn(PETSC_SUCCESS);
396 }
397