Date: 2022-03-04T17:38:25+00:00

Actual source code: dageometry.c

      1: #include <petscsf.h>
      2: #include <petsc/private/dmdaimpl.h>

      4: /*@
      5:   DMDAConvertToCell - Convert (i,j,k) to local cell number

      7:   Not Collective

      9:   Input Parameters:
     10: + da - the distributed array
     11: - s - A MatStencil giving (i,j,k)

     13:   Output Parameter:
     14: . cell - the local cell number

     16:   Level: developer
     17: @*/
     18: PetscErrorCode DMDAConvertToCell(DM dm, MatStencil s, PetscInt *cell)
     19: {
     20:   DM_DA          *da = (DM_DA*) dm->data;
     21:   const PetscInt dim = dm->dim;
     22:   const PetscInt mx  = (da->Xe - da->Xs)/da->w, my = da->Ye - da->Ys /*, mz = da->Ze - da->Zs*/;
     23:   const PetscInt il  = s.i - da->Xs/da->w, jl = dim > 1 ? s.j - da->Ys : 0, kl = dim > 2 ? s.k - da->Zs : 0;

     26:   *cell = -1;
     27:   if ((s.i < da->Xs/da->w) || (s.i >= da->Xe/da->w))    SETERRQ3(PetscObjectComm((PetscObject)dm), PETSC_ERR_ARG_OUTOFRANGE, "Stencil i %D should be in [%D, %D)", s.i, da->Xs/da->w, da->Xe/da->w);
     28:   if ((dim > 1) && ((s.j < da->Ys) || (s.j >= da->Ye))) SETERRQ3(PetscObjectComm((PetscObject)dm), PETSC_ERR_ARG_OUTOFRANGE, "Stencil j %D should be in [%D, %D)", s.j, da->Ys, da->Ye);
     29:   if ((dim > 2) && ((s.k < da->Zs) || (s.k >= da->Ze))) SETERRQ3(PetscObjectComm((PetscObject)dm), PETSC_ERR_ARG_OUTOFRANGE, "Stencil k %D should be in [%D, %D)", s.k, da->Zs, da->Ze);
     30:   *cell = (kl*my + jl)*mx + il;
     31:   return(0);
     32: }

     34: PetscErrorCode private_DMDALocatePointsIS_2D_Regular(DM dmregular,Vec pos,IS *iscell)
     35: {
     36:   PetscInt          n,bs,p,npoints;
     37:   PetscInt          xs,xe,Xs,Xe,mxlocal;
     38:   PetscInt          ys,ye,Ys,Ye,mylocal;
     39:   PetscInt          d,c0,c1;
     40:   PetscReal         gmin_l[2],gmax_l[2],dx[2];
     41:   PetscReal         gmin[2],gmax[2];
     42:   PetscInt          *cellidx;
     43:   Vec               coor;
     44:   const PetscScalar *_coor;
     45:   PetscErrorCode    ierr;

     48:   DMDAGetCorners(dmregular,&xs,&ys,NULL,&xe,&ye,NULL);
     49:   DMDAGetGhostCorners(dmregular,&Xs,&Ys,NULL,&Xe,&Ye,NULL);
     50:   xe += xs; Xe += Xs; if (xs != Xs) xs -= 1;
     51:   ye += ys; Ye += Ys; if (ys != Ys) ys -= 1;

     53:   mxlocal = xe - xs - 1;
     54:   mylocal = ye - ys - 1;

     56:   DMGetCoordinatesLocal(dmregular,&coor);
     57:   VecGetArrayRead(coor,&_coor);
     58:   c0 = (xs-Xs) + (ys-Ys)*(Xe-Xs);
     59:   c1 = (xe-2-Xs+1) + (ye-2-Ys+1)*(Xe-Xs);

     61:   gmin_l[0] = PetscRealPart(_coor[2*c0+0]);
     62:   gmin_l[1] = PetscRealPart(_coor[2*c0+1]);

     64:   gmax_l[0] = PetscRealPart(_coor[2*c1+0]);
     65:   gmax_l[1] = PetscRealPart(_coor[2*c1+1]);

     67:   dx[0] = (gmax_l[0]-gmin_l[0])/((PetscReal)mxlocal);
     68:   dx[1] = (gmax_l[1]-gmin_l[1])/((PetscReal)mylocal);

     70:   VecRestoreArrayRead(coor,&_coor);

     72:   DMGetBoundingBox(dmregular,gmin,gmax);

     74:   VecGetLocalSize(pos,&n);
     75:   VecGetBlockSize(pos,&bs);
     76:   npoints = n/bs;

     78:   PetscMalloc1(npoints,&cellidx);
     79:   VecGetArrayRead(pos,&_coor);
     80:   for (p=0; p<npoints; p++) {
     81:     PetscReal coor_p[2];
     82:     PetscInt  mi[2];

     84:     coor_p[0] = PetscRealPart(_coor[2*p]);
     85:     coor_p[1] = PetscRealPart(_coor[2*p+1]);

     87:     cellidx[p] = DMLOCATEPOINT_POINT_NOT_FOUND;

     89:     if (coor_p[0] < gmin_l[0]) { continue; }
     90:     if (coor_p[0] > gmax_l[0]) { continue; }
     91:     if (coor_p[1] < gmin_l[1]) { continue; }
     92:     if (coor_p[1] > gmax_l[1]) { continue; }

     94:     for (d=0; d<2; d++) {
     95:       mi[d] = (PetscInt)((coor_p[d] - gmin[d])/dx[d]);
     96:     }

     98:     if (mi[0] < xs)     { continue; }
     99:     if (mi[0] > (xe-1)) { continue; }
    100:     if (mi[1] < ys)     { continue; }
    101:     if (mi[1] > (ye-1)) { continue; }

    103:     if (mi[0] == (xe-1)) { mi[0]--; }
    104:     if (mi[1] == (ye-1)) { mi[1]--; }

    106:     cellidx[p] = (mi[0]-xs) + (mi[1]-ys) * mxlocal;
    107:   }
    108:   VecRestoreArrayRead(pos,&_coor);
    109:   ISCreateGeneral(PETSC_COMM_SELF,npoints,cellidx,PETSC_OWN_POINTER,iscell);
    110:   return(0);
    111: }

    113: PetscErrorCode private_DMDALocatePointsIS_3D_Regular(DM dmregular,Vec pos,IS *iscell)
    114: {
    115:   PetscInt          n,bs,p,npoints;
    116:   PetscInt          xs,xe,Xs,Xe,mxlocal;
    117:   PetscInt          ys,ye,Ys,Ye,mylocal;
    118:   PetscInt          zs,ze,Zs,Ze,mzlocal;
    119:   PetscInt          d,c0,c1;
    120:   PetscReal         gmin_l[3],gmax_l[3],dx[3];
    121:   PetscReal         gmin[3],gmax[3];
    122:   PetscInt          *cellidx;
    123:   Vec               coor;
    124:   const PetscScalar *_coor;
    125:   PetscErrorCode    ierr;

    128:   DMDAGetCorners(dmregular,&xs,&ys,&zs,&xe,&ye,&ze);
    129:   DMDAGetGhostCorners(dmregular,&Xs,&Ys,&Zs,&Xe,&Ye,&Ze);
    130:   xe += xs; Xe += Xs; if (xs != Xs) xs -= 1;
    131:   ye += ys; Ye += Ys; if (ys != Ys) ys -= 1;
    132:   ze += zs; Ze += Zs; if (zs != Zs) zs -= 1;

    134:   mxlocal = xe - xs - 1;
    135:   mylocal = ye - ys - 1;
    136:   mzlocal = ze - zs - 1;

    138:   DMGetCoordinatesLocal(dmregular,&coor);
    139:   VecGetArrayRead(coor,&_coor);
    140:   c0 = (xs-Xs)     + (ys-Ys)    *(Xe-Xs) + (zs-Zs)    *(Xe-Xs)*(Ye-Ys);
    141:   c1 = (xe-2-Xs+1) + (ye-2-Ys+1)*(Xe-Xs) + (ze-2-Zs+1)*(Xe-Xs)*(Ye-Ys);

    143:   gmin_l[0] = PetscRealPart(_coor[3*c0+0]);
    144:   gmin_l[1] = PetscRealPart(_coor[3*c0+1]);
    145:   gmin_l[2] = PetscRealPart(_coor[3*c0+2]);

    147:   gmax_l[0] = PetscRealPart(_coor[3*c1+0]);
    148:   gmax_l[1] = PetscRealPart(_coor[3*c1+1]);
    149:   gmax_l[2] = PetscRealPart(_coor[3*c1+2]);

    151:   dx[0] = (gmax_l[0]-gmin_l[0])/((PetscReal)mxlocal);
    152:   dx[1] = (gmax_l[1]-gmin_l[1])/((PetscReal)mylocal);
    153:   dx[2] = (gmax_l[2]-gmin_l[2])/((PetscReal)mzlocal);

    155:   VecRestoreArrayRead(coor,&_coor);

    157:   DMGetBoundingBox(dmregular,gmin,gmax);

    159:   VecGetLocalSize(pos,&n);
    160:   VecGetBlockSize(pos,&bs);
    161:   npoints = n/bs;

    163:   PetscMalloc1(npoints,&cellidx);
    164:   VecGetArrayRead(pos,&_coor);
    165:   for (p=0; p<npoints; p++) {
    166:     PetscReal coor_p[3];
    167:     PetscInt  mi[3];

    169:     coor_p[0] = PetscRealPart(_coor[3*p]);
    170:     coor_p[1] = PetscRealPart(_coor[3*p+1]);
    171:     coor_p[2] = PetscRealPart(_coor[3*p+2]);

    173:     cellidx[p] = DMLOCATEPOINT_POINT_NOT_FOUND;

    175:     if (coor_p[0] < gmin_l[0]) { continue; }
    176:     if (coor_p[0] > gmax_l[0]) { continue; }
    177:     if (coor_p[1] < gmin_l[1]) { continue; }
    178:     if (coor_p[1] > gmax_l[1]) { continue; }
    179:     if (coor_p[2] < gmin_l[2]) { continue; }
    180:     if (coor_p[2] > gmax_l[2]) { continue; }

    182:     for (d=0; d<3; d++) {
    183:       mi[d] = (PetscInt)((coor_p[d] - gmin[d])/dx[d]);
    184:     }

    186:     if (mi[0] < xs)     { continue; }
    187:     if (mi[0] > (xe-1)) { continue; }
    188:     if (mi[1] < ys)     { continue; }
    189:     if (mi[1] > (ye-1)) { continue; }
    190:     if (mi[2] < zs)     { continue; }
    191:     if (mi[2] > (ze-1)) { continue; }

    193:     if (mi[0] == (xe-1)) { mi[0]--; }
    194:     if (mi[1] == (ye-1)) { mi[1]--; }
    195:     if (mi[2] == (ze-1)) { mi[2]--; }

    197:     cellidx[p] = (mi[0]-xs) + (mi[1]-ys) * mxlocal + (mi[2]-zs) * mxlocal * mylocal;
    198:   }
    199:   VecRestoreArrayRead(pos,&_coor);
    200:   ISCreateGeneral(PETSC_COMM_SELF,npoints,cellidx,PETSC_OWN_POINTER,iscell);
    201:   return(0);
    202: }

    204: PetscErrorCode DMLocatePoints_DA_Regular(DM dm,Vec pos,DMPointLocationType ltype,PetscSF cellSF)
    205: {
    206:   IS             iscell;
    207:   PetscSFNode    *cells;
    208:   PetscInt       p,bs,dim,npoints,nfound;
    209:   const PetscInt *boxCells;

    213:   VecGetBlockSize(pos,&dim);
    214:   switch (dim) {
    215:     case 1:
    216:       SETERRQ(PetscObjectComm((PetscObject)dm),PETSC_ERR_SUP,"Support not provided for 1D");
    217:     case 2:
    218:       private_DMDALocatePointsIS_2D_Regular(dm,pos,&iscell);
    219:       break;
    220:     case 3:
    221:       private_DMDALocatePointsIS_3D_Regular(dm,pos,&iscell);
    222:       break;
    223:     default:
    224:       SETERRQ(PetscObjectComm((PetscObject)dm),PETSC_ERR_SUP,"Unsupport spatial dimension");
    225:   }

    227:   VecGetLocalSize(pos,&npoints);
    228:   VecGetBlockSize(pos,&bs);
    229:   npoints = npoints / bs;

    231:   PetscMalloc1(npoints, &cells);
    232:   ISGetIndices(iscell, &boxCells);

    234:   for (p=0; p<npoints; p++) {
    235:     cells[p].rank  = 0;
    236:     cells[p].index = boxCells[p];
    237:   }
    238:   ISRestoreIndices(iscell, &boxCells);

    240:   nfound = npoints;
    241:   PetscSFSetGraph(cellSF, npoints, nfound, NULL, PETSC_OWN_POINTER, cells, PETSC_OWN_POINTER);
    242:   ISDestroy(&iscell);
    243:   return(0);
    244: }