/* Copyright 2004,2007,2018,2021 IPB, Universite de Bordeaux, INRIA & CNRS
**
** This file is part of the Scotch software package for static mapping,
** graph partitioning and sparse matrix ordering.
**
** This software is governed by the CeCILL-C license under French law
** and abiding by the rules of distribution of free software. You can
** use, modify and/or redistribute the software under the terms of the
** CeCILL-C license as circulated by CEA, CNRS and INRIA at the following
** URL: "http://www.cecill.info".
**
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** the economic rights, and the successive licensors have only limited
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**
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**
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*/
/************************************************************/
/**                                                        **/
/**   NAME       : hmesh_order_nd.h                        **/
/**                                                        **/
/**   AUTHOR     : Francois PELLEGRINI                     **/
/**                                                        **/
/**   FUNCTION   : These lines are the data declaration    **/
/**                for the halo mesh nested dissection     **/
/**                ordering algorithm.                     **/
/**                                                        **/
/**   DATES      : # Version 4.0  : from : 06 jan 2002     **/
/**                                 to   : 23 jan 2004     **/
/**                # Version 6.0  : from : 07 jun 2018     **/
/**                                 to   : 07 jun 2018     **/
/**                # Version 7.0  : from : 27 apr 2021     **/
/**                                 to   : 27 apr 2021     **/
/**                                                        **/
/************************************************************/

/*
**  The type and structure definitions.
*/

/*+ This structure holds the method parameters. +*/

typedef struct HmeshOrderNdParam_ {
  Strat *                   sepstrat;             /*+ Separation strategy         +*/
  Strat *                   ordstratlea;          /*+ Leaf ordering strategy      +*/
  Strat *                   ordstratsep;          /*+ Separator ordering strategy +*/
} HmeshOrderNdParam;

/*+ This structure holds the splitting parameters. +*/

typedef struct HmeshOrderNdSplit2_ {
  Gnum                      velmnbr;              /*+ Number of induced elements               +*/
  Gnum                      vnodnbr;              /*+ Number of induced nodes                  +*/
  Gnum                      ordenum;              /*+ Local start index of inverse permutation +*/
  OrderCblk *               cblkptr;              /*+ Column block to process                  +*/
} HmeshOrderNdSplit2;

typedef struct HmeshOrderNdSplit_ {
  HmeshOrderNdSplit2        splttab[2];           /*+ Array of induced submesh data     +*/
  const Hmesh *             meshptr;              /*+ Original mesh                     +*/
  Gnum                      vnspnbr;              /*+ Number of induced separator nodes +*/
  GraphPart *               parttax;              /*+ Pointer to part array             +*/
  Order *                   ordeptr;              /*+ Pointer to ordering               +*/
  const HmeshOrderNdParam * paraptr;              /*+ Nested dissection parameters      +*/
  int *                     revaptr;              /*+ Pointer to return value           +*/
} HmeshOrderNdSplit;

/*
**  The function prototypes.
*/

#ifdef HMESH_ORDER_ND
static void                 hmeshOrderNd2       (Context * restrict const, const int, const HmeshOrderNdSplit * const);
#endif /* HMESH_ORDER_ND */

int                         hmeshOrderNd        (const Hmesh * restrict const, Order * restrict const, const Gnum, OrderCblk * restrict const, const HmeshOrderNdParam * const);
