mirror of
https://github.com/brl/mutter.git
synced 2024-11-23 00:20:42 -05:00
b86e330957
This copies the files for the GLU tesselator from Mesa. The Mesa code is based on the original SGI code and is released under a BSD license. The memalloc.h header has been replaced with one that forces the code to use g_malloc and friends. The rest of the files are not altered from the original so it should be possible to later upgrade the files by simply overwriting them. There is a tesselator.h header which is expected to be included by rest of Cogl to use the tesselator. This contains a trimmed down version of glu.h that only includes parts that pertain to the tesselator. There is also a stub glu.h in the GL directory which is just provided so that the tesselator code can include <GL/gl.h> without depending on the system header. It just redirects to tesselator.h
118 lines
4.1 KiB
C
118 lines
4.1 KiB
C
/*
|
|
* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
|
|
* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice including the dates of first publication and
|
|
* either this permission notice or a reference to
|
|
* http://oss.sgi.com/projects/FreeB/
|
|
* shall be included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
|
|
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
* Except as contained in this notice, the name of Silicon Graphics, Inc.
|
|
* shall not be used in advertising or otherwise to promote the sale, use or
|
|
* other dealings in this Software without prior written authorization from
|
|
* Silicon Graphics, Inc.
|
|
*/
|
|
/*
|
|
** Author: Eric Veach, July 1994.
|
|
**
|
|
*/
|
|
|
|
#ifndef __priorityq_sort_h_
|
|
#define __priorityq_sort_h_
|
|
|
|
#include "priorityq-heap.h"
|
|
|
|
#undef PQkey
|
|
#undef PQhandle
|
|
#undef PriorityQ
|
|
#undef pqNewPriorityQ
|
|
#undef pqDeletePriorityQ
|
|
#undef pqInit
|
|
#undef pqInsert
|
|
#undef pqMinimum
|
|
#undef pqExtractMin
|
|
#undef pqDelete
|
|
#undef pqIsEmpty
|
|
|
|
/* Use #define's so that another heap implementation can use this one */
|
|
|
|
#define PQkey PQSortKey
|
|
#define PQhandle PQSortHandle
|
|
#define PriorityQ PriorityQSort
|
|
|
|
#define pqNewPriorityQ(leq) __gl_pqSortNewPriorityQ(leq)
|
|
#define pqDeletePriorityQ(pq) __gl_pqSortDeletePriorityQ(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_pqSortInit(pq)
|
|
#define pqInsert(pq,key) __gl_pqSortInsert(pq,key)
|
|
#define pqMinimum(pq) __gl_pqSortMinimum(pq)
|
|
#define pqExtractMin(pq) __gl_pqSortExtractMin(pq)
|
|
#define pqDelete(pq,handle) __gl_pqSortDelete(pq,handle)
|
|
#define pqIsEmpty(pq) __gl_pqSortIsEmpty(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 PQHeapKey PQkey;
|
|
typedef PQHeapHandle PQhandle;
|
|
typedef struct PriorityQ PriorityQ;
|
|
|
|
struct PriorityQ {
|
|
PriorityQHeap *heap;
|
|
PQkey *keys;
|
|
PQkey **order;
|
|
PQhandle size, max;
|
|
int initialized;
|
|
int (*leq)(PQkey key1, PQkey key2);
|
|
};
|
|
|
|
PriorityQ *pqNewPriorityQ( int (*leq)(PQkey key1, PQkey key2) );
|
|
void pqDeletePriorityQ( PriorityQ *pq );
|
|
|
|
int pqInit( PriorityQ *pq );
|
|
PQhandle pqInsert( PriorityQ *pq, PQkey key );
|
|
PQkey pqExtractMin( PriorityQ *pq );
|
|
void pqDelete( PriorityQ *pq, PQhandle handle );
|
|
|
|
PQkey pqMinimum( PriorityQ *pq );
|
|
int pqIsEmpty( PriorityQ *pq );
|
|
|
|
#endif
|