mirror of
https://github.com/reactos/reactos.git
synced 2025-01-11 16:51:06 +00:00
114 lines
4.4 KiB
C
114 lines
4.4 KiB
C
/*
|
|
** License Applicability. Except to the extent portions of this file are
|
|
** made subject to an alternative license as permitted in the SGI Free
|
|
** Software License B, Version 1.1 (the "License"), the contents of this
|
|
** file are subject only to the provisions of the License. You may not use
|
|
** this file except in compliance with the License. You may obtain a copy
|
|
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
|
|
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
|
|
**
|
|
** http://oss.sgi.com/projects/FreeB
|
|
**
|
|
** Note that, as provided in the License, the Software is distributed on an
|
|
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
|
|
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
|
|
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
|
|
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
|
|
**
|
|
** Original Code. The Original Code is: OpenGL Sample Implementation,
|
|
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
|
|
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
|
|
** Copyright in any portions created by third parties is as indicated
|
|
** elsewhere herein. All Rights Reserved.
|
|
**
|
|
** Additional Notice Provisions: The application programming interfaces
|
|
** established by SGI in conjunction with the Original Code are The
|
|
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
|
|
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
|
|
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
|
|
** Window System(R) (Version 1.3), released October 19, 1998. This software
|
|
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
|
|
** published by SGI, but has not been independently verified as being
|
|
** compliant with the OpenGL(R) version 1.2.1 Specification.
|
|
**
|
|
*/
|
|
/*
|
|
** Author: Eric Veach, July 1994.
|
|
**
|
|
** $Date$ $Revision: 1.1 $
|
|
** $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libtess/priorityq-heap.h,v 1.1 2004/02/02 16:39:15 navaraf Exp $
|
|
*/
|
|
|
|
#ifndef __priorityq_heap_h_
|
|
#define __priorityq_heap_h_
|
|
|
|
/* Use #define's so that another heap implementation can use this one */
|
|
|
|
#define PQkey PQHeapKey
|
|
#define PQhandle PQHeapHandle
|
|
#define PriorityQ PriorityQHeap
|
|
|
|
#define pqNewPriorityQ(leq) __gl_pqHeapNewPriorityQ(leq)
|
|
#define pqDeletePriorityQ(pq) __gl_pqHeapDeletePriorityQ(pq)
|
|
|
|
/* The basic operations are insertion of a new key (pqInsert),
|
|
* and examination/extraction of a key whose value is minimum
|
|
* (pqMinimum/pqExtractMin). Deletion is also allowed (pqDelete);
|
|
* for this purpose pqInsert returns a "handle" which is supplied
|
|
* as the argument.
|
|
*
|
|
* An initial heap may be created efficiently by calling pqInsert
|
|
* repeatedly, then calling pqInit. In any case pqInit must be called
|
|
* before any operations other than pqInsert are used.
|
|
*
|
|
* If the heap is empty, pqMinimum/pqExtractMin will return a NULL key.
|
|
* This may also be tested with pqIsEmpty.
|
|
*/
|
|
#define pqInit(pq) __gl_pqHeapInit(pq)
|
|
#define pqInsert(pq,key) __gl_pqHeapInsert(pq,key)
|
|
#define pqMinimum(pq) __gl_pqHeapMinimum(pq)
|
|
#define pqExtractMin(pq) __gl_pqHeapExtractMin(pq)
|
|
#define pqDelete(pq,handle) __gl_pqHeapDelete(pq,handle)
|
|
#define pqIsEmpty(pq) __gl_pqHeapIsEmpty(pq)
|
|
|
|
|
|
/* Since we support deletion the data structure is a little more
|
|
* complicated than an ordinary heap. "nodes" is the heap itself;
|
|
* active nodes are stored in the range 1..pq->size. When the
|
|
* heap exceeds its allocated size (pq->max), its size doubles.
|
|
* The children of node i are nodes 2i and 2i+1.
|
|
*
|
|
* Each node stores an index into an array "handles". Each handle
|
|
* stores a key, plus a pointer back to the node which currently
|
|
* represents that key (ie. nodes[handles[i].node].handle == i).
|
|
*/
|
|
|
|
typedef void *PQkey;
|
|
typedef long PQhandle;
|
|
typedef struct PriorityQ PriorityQ;
|
|
|
|
typedef struct { PQhandle handle; } PQnode;
|
|
typedef struct { PQkey key; PQhandle node; } PQhandleElem;
|
|
|
|
struct PriorityQ {
|
|
PQnode *nodes;
|
|
PQhandleElem *handles;
|
|
long size, max;
|
|
PQhandle freeList;
|
|
int initialized;
|
|
int (*leq)(PQkey key1, PQkey key2);
|
|
};
|
|
|
|
PriorityQ *pqNewPriorityQ( int (*leq)(PQkey key1, PQkey key2) );
|
|
void pqDeletePriorityQ( PriorityQ *pq );
|
|
|
|
void pqInit( PriorityQ *pq );
|
|
PQhandle pqInsert( PriorityQ *pq, PQkey key );
|
|
PQkey pqExtractMin( PriorityQ *pq );
|
|
void pqDelete( PriorityQ *pq, PQhandle handle );
|
|
|
|
|
|
#define __gl_pqHeapMinimum(pq) ((pq)->handles[(pq)->nodes[1].handle].key)
|
|
#define __gl_pqHeapIsEmpty(pq) ((pq)->size == 0)
|
|
|
|
#endif
|