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125 lines
4.5 KiB
C
125 lines
4.5 KiB
C
/*
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** License Applicability. Except to the extent portions of this file are
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** made subject to an alternative license as permitted in the SGI Free
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** Software License B, Version 1.1 (the "License"), the contents of this
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** file are subject only to the provisions of the License. You may not use
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** this file except in compliance with the License. You may obtain a copy
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** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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**
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** http://oss.sgi.com/projects/FreeB
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**
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** Note that, as provided in the License, the Software is distributed on an
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** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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**
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** Original Code. The Original Code is: OpenGL Sample Implementation,
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** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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** Copyright in any portions created by third parties is as indicated
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** elsewhere herein. All Rights Reserved.
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**
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** Additional Notice Provisions: The application programming interfaces
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** established by SGI in conjunction with the Original Code are The
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** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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** Window System(R) (Version 1.3), released October 19, 1998. This software
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** was created using the OpenGL(R) version 1.2.1 Sample Implementation
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** published by SGI, but has not been independently verified as being
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** compliant with the OpenGL(R) version 1.2.1 Specification.
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**
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*/
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/*
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** Author: Eric Veach, July 1994.
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**
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** $Date$ $Revision: 1.1 $
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** $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libtess/priorityq-sort.h,v 1.1 2004/02/02 16:39:15 navaraf Exp $
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*/
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#ifndef __priorityq_sort_h_
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#define __priorityq_sort_h_
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#include "priorityq-heap.h"
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#undef PQkey
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#undef PQhandle
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#undef PriorityQ
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#undef pqNewPriorityQ
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#undef pqDeletePriorityQ
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#undef pqInit
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#undef pqInsert
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#undef pqMinimum
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#undef pqExtractMin
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#undef pqDelete
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#undef pqIsEmpty
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/* Use #define's so that another heap implementation can use this one */
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#define PQkey PQSortKey
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#define PQhandle PQSortHandle
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#define PriorityQ PriorityQSort
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#define pqNewPriorityQ(leq) __gl_pqSortNewPriorityQ(leq)
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#define pqDeletePriorityQ(pq) __gl_pqSortDeletePriorityQ(pq)
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/* The basic operations are insertion of a new key (pqInsert),
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* and examination/extraction of a key whose value is minimum
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* (pqMinimum/pqExtractMin). Deletion is also allowed (pqDelete);
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* for this purpose pqInsert returns a "handle" which is supplied
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* as the argument.
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*
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* An initial heap may be created efficiently by calling pqInsert
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* repeatedly, then calling pqInit. In any case pqInit must be called
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* before any operations other than pqInsert are used.
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*
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* If the heap is empty, pqMinimum/pqExtractMin will return a NULL key.
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* This may also be tested with pqIsEmpty.
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*/
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#define pqInit(pq) __gl_pqSortInit(pq)
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#define pqInsert(pq,key) __gl_pqSortInsert(pq,key)
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#define pqMinimum(pq) __gl_pqSortMinimum(pq)
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#define pqExtractMin(pq) __gl_pqSortExtractMin(pq)
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#define pqDelete(pq,handle) __gl_pqSortDelete(pq,handle)
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#define pqIsEmpty(pq) __gl_pqSortIsEmpty(pq)
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/* Since we support deletion the data structure is a little more
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* complicated than an ordinary heap. "nodes" is the heap itself;
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* active nodes are stored in the range 1..pq->size. When the
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* heap exceeds its allocated size (pq->max), its size doubles.
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* The children of node i are nodes 2i and 2i+1.
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*
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* Each node stores an index into an array "handles". Each handle
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* stores a key, plus a pointer back to the node which currently
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* represents that key (ie. nodes[handles[i].node].handle == i).
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*/
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typedef PQHeapKey PQkey;
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typedef PQHeapHandle PQhandle;
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typedef struct PriorityQ PriorityQ;
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struct PriorityQ {
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PriorityQHeap *heap;
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PQkey *keys;
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PQkey **order;
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PQhandle size, max;
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int initialized;
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int (*leq)(PQkey key1, PQkey key2);
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};
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PriorityQ *pqNewPriorityQ( int (*leq)(PQkey key1, PQkey key2) );
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void pqDeletePriorityQ( PriorityQ *pq );
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int pqInit( PriorityQ *pq );
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PQhandle pqInsert( PriorityQ *pq, PQkey key );
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PQkey pqExtractMin( PriorityQ *pq );
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void pqDelete( PriorityQ *pq, PQhandle handle );
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PQkey pqMinimum( PriorityQ *pq );
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int pqIsEmpty( PriorityQ *pq );
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#endif
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