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 */
 24:   char                        ***compNames;   /* The component names */

 26:   PetscObject                   clObj;        /* Key for the closure (right now we only have one) */
 27:   PetscSection                  clSection;    /* Section giving the number of points in each closure */
 28:   IS                            clPoints;     /* Points in each closure */
 29:   PetscInt                      clSize;       /* The size of a dof closure of a cell, when it is uniform */
 30:   PetscInt                     *clPerm;       /* A permutation of the cell dof closure, of size clSize */
 31:   PetscInt                     *clInvPerm;    /* The inverse of clPerm */
 32:   PetscSectionSym               sym;          /* Symmetries of the data */
 33: };

 35: struct _PetscSectionSymOps {
 36:   PetscErrorCode (*getpoints)(PetscSectionSym,PetscSection,PetscInt,const PetscInt *,const PetscInt **,const PetscScalar **);
 37:   PetscErrorCode (*destroy)(PetscSectionSym);
 38:   PetscErrorCode (*view)(PetscSectionSym,PetscViewer);
 39: };

 41: typedef struct _n_SymWorkLink *SymWorkLink;

 43: struct _n_SymWorkLink
 44: {
 45:   SymWorkLink         next;
 46:   const PetscInt    **perms;
 47:   const PetscScalar **rots;
 48:   PetscInt           numPoints;
 49: };

 51: struct _p_PetscSectionSym {
 52:   PETSCHEADER(struct _PetscSectionSymOps);
 53:   void *data;
 54:   SymWorkLink workin;
 55:   SymWorkLink workout;
 56: };

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

 63: #endif