Actual source code: sectionimpl.h
petsc-3.12.4 2020-02-04
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      1: #if !defined(PETSCSECTIONIMPL_H)
      2: #define PETSCSECTIONIMPL_H

      4:  #include <petscsection.h>
      5:  #include <petsc/private/petscimpl.h>

      7: struct _p_PetscSection {
      8:   PETSCHEADER(int);
      9:   PetscInt                      pStart, pEnd; /* The chart: all points are contained in [pStart, pEnd) */
     10:   IS                            perm;         /* A permutation of [0, pEnd-pStart) */
     11:   PetscBool                     pointMajor;   /* True if the offsets are point major, otherwise they are fieldMajor */
     12:   PetscInt                     *atlasDof;     /* Describes layout of storage, point --> # of values */
     13:   PetscInt                     *atlasOff;     /* Describes layout of storage, point --> offset into storage */
     14:   PetscInt                      maxDof;       /* Maximum dof on any point */
     15:   PetscSection                  bc;           /* Describes constraints, point --> # local dofs which are constrained */
     16:   PetscInt                     *bcIndices;    /* Local indices for constrained dofs */
     17:   PetscBool                     setup;

     19:   PetscInt                      numFields;    /* The number of fields making up the degrees of freedom */
     20:   char                        **fieldNames;   /* The field names */
     21:   PetscInt                     *numFieldComponents; /* The number of components in each field */
     22:   PetscSection                 *field;        /* A section describing the layout and constraints for each field */
     23:   PetscBool                     useFieldOff;  /* Use the field offsets directly for the global section, rather than the point offset */

     25:   PetscObject                   clObj;        /* Key for the closure (right now we only have one) */
     26:   PetscSection                  clSection;    /* Section giving the number of points in each closure */
     27:   IS                            clPoints;     /* Points in each closure */
     28:   PetscInt                      clSize;       /* The size of a dof closure of a cell, when it is uniform */
     29:   PetscInt                     *clPerm;       /* A permutation of the cell dof closure, of size clSize */
     30:   PetscInt                     *clInvPerm;    /* The inverse of clPerm */
     31:   PetscSectionSym               sym;          /* Symmetries of the data */
     32: };

     34: struct _PetscSectionSymOps {
     35:   PetscErrorCode (*getpoints)(PetscSectionSym,PetscSection,PetscInt,const PetscInt *,const PetscInt **,const PetscScalar **);
     36:   PetscErrorCode (*destroy)(PetscSectionSym);
     37:   PetscErrorCode (*view)(PetscSectionSym,PetscViewer);
     38: };

     40: typedef struct _n_SymWorkLink *SymWorkLink;

     42: struct _n_SymWorkLink
     43: {
     44:   SymWorkLink         next;
     45:   const PetscInt    **perms;
     46:   const PetscScalar **rots;
     47:   PetscInt           numPoints;
     48: };

     50: struct _p_PetscSectionSym {
     51:   PETSCHEADER(struct _PetscSectionSymOps);
     52:   void *data;
     53:   SymWorkLink workin;
     54:   SymWorkLink workout;
     55: };

     57: PETSC_EXTERN PetscErrorCode PetscSectionSetClosurePermutation_Internal(PetscSection, PetscObject, PetscInt, PetscCopyMode, PetscInt *);
     58: PETSC_EXTERN PetscErrorCode PetscSectionGetClosurePermutation_Internal(PetscSection, PetscObject, PetscInt *, const PetscInt *[]);
     59: PETSC_EXTERN PetscErrorCode PetscSectionGetClosureInversePermutation_Internal(PetscSection, PetscObject, PetscInt *, const PetscInt *[]);
     60: PETSC_EXTERN PetscErrorCode ISIntersect_Caching_Internal(IS, IS, IS *);

     62: #endif