ReactOS 0.4.15-dev-8417-gb6b82fe
hull.cc
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1/*
2** License Applicability. Except to the extent portions of this file are
3** made subject to an alternative license as permitted in the SGI Free
4** Software License B, Version 1.1 (the "License"), the contents of this
5** file are subject only to the provisions of the License. You may not use
6** this file except in compliance with the License. You may obtain a copy
7** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
8** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
9**
10** http://oss.sgi.com/projects/FreeB
11**
12** Note that, as provided in the License, the Software is distributed on an
13** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
14** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
15** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
16** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
17**
18** Original Code. The Original Code is: OpenGL Sample Implementation,
19** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
20** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
21** Copyright in any portions created by third parties is as indicated
22** elsewhere herein. All Rights Reserved.
23**
24** Additional Notice Provisions: The application programming interfaces
25** established by SGI in conjunction with the Original Code are The
26** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
27** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
28** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
29** Window System(R) (Version 1.3), released October 19, 1998. This software
30** was created using the OpenGL(R) version 1.2.1 Sample Implementation
31** published by SGI, but has not been independently verified as being
32** compliant with the OpenGL(R) version 1.2.1 Specification.
33*/
34
35/*
36 * hull.c++
37 *
38 */
39
40//#include "glimports.h"
41//#include "myassert.h"
42//#include "mystdio.h"
43#include "hull.h"
44//#include "gridvertex.h"
45//#include "gridtrimvertex.h"
46//#include "gridline.h"
47//#include "trimline.h"
48//#include "uarray.h"
49//#include "trimregion.h"
50
52{}
53
55{}
56
57/*----------------------------------------------------------------------
58 * Hull:init - this routine does the initialization needed before any
59 * calls to nextupper or nextlower can be made.
60 *----------------------------------------------------------------------
61 */
62void
64{
65 TrimVertex *lfirst = left.first();
66 TrimVertex *llast = left.last();
67 if( lfirst->param[0] <= llast->param[0] ) {
68 fakeleft.init( left.first() );
70 lower.left = &left;
71 } else {
72 fakeleft.init( left.last() );
74 upper.left = &left;
75 }
76 upper.left->last();
77 lower.left->first();
78
79 if( top.ustart <= top.uend ) {
80 upper.line = &top;
81 upper.index = top.ustart;
82 } else
83 upper.line = 0;
84
85 if( bot.ustart <= bot.uend ) {
86 lower.line = &bot;
88 } else
89 lower.line = 0;
90
91 TrimVertex *rfirst = right.first();
92 TrimVertex *rlast = right.last();
93 if( rfirst->param[0] <= rlast->param[0] ) {
94 fakeright.init( right.last() );
96 upper.right = &right;
97 } else {
98 fakeright.init( right.first() );
100 lower.right = &right;
101 }
102 upper.right->first();
103 lower.right->last();
104}
105
106/*----------------------------------------------------------------------
107 * nextupper - find next vertex on upper hull of trim region.
108 * - if vertex is on trim curve, set vtop point to
109 * that vertex. if vertex is on grid, set vtop to
110 * point to temporary area and stuff coordinants into
111 * temporary vertex. Also, place grid coords in temporary
112 * grid vertex.
113 *----------------------------------------------------------------------
114 */
117{
118 if( upper.left ) {
119 gv->set( upper.left->prev() );
120 if( gv->isTrimVert() ) return gv;
121 upper.left = 0;
122 }
123
124 if( upper.line ) {
127 gv->set( upper.index, upper.line->vindex );
128 if( upper.index++ == upper.line->uend ) upper.line = 0;
129 return gv;
130 }
131
132 if( upper.right ) {
133 gv->set( upper.right->next() );
134 if( gv->isTrimVert() ) return gv;
135 upper.right = 0;
136 }
137
138 return 0;
139}
140
143{
144 if( lower.left ) {
145 gv->set( lower.left->next() );
146 if( gv->isTrimVert() ) return gv;
147 lower.left = 0;
148 }
149
150 if( lower.line ) {
152 gv->set( lower.index, lower.line->vindex );
153 if( lower.index++ == lower.line->uend ) lower.line = 0;
154 return gv;
155 }
156
157 if( lower.right ) {
158 gv->set( lower.right->prev() );
159 if( gv->isTrimVert() ) return gv;
160 lower.right = 0;
161 }
162
163 return 0;
164}
165
void set(long, long)
Side upper
Definition: hull.h:63
Hull(void)
Definition: hull.cc:51
void init(void)
Definition: hull.cc:63
GridTrimVertex * nextupper(GridTrimVertex *)
Definition: hull.cc:116
GridTrimVertex * nextlower(GridTrimVertex *)
Definition: hull.cc:142
Trimline fakeleft
Definition: hull.h:64
Side lower
Definition: hull.h:62
Trimline fakeright
Definition: hull.h:65
~Hull(void)
Definition: hull.cc:54
Gridline bot
Definition: trimregion.h:56
Trimline right
Definition: trimregion.h:54
Uarray uarray
Definition: trimregion.h:57
Trimline left
Definition: trimregion.h:53
Gridline top
Definition: trimregion.h:55
REAL param[2]
Definition: trimvertex.h:45
TrimVertex * prev(void)
Definition: trimline.h:87
TrimVertex * first(void)
Definition: trimline.h:93
void init(TrimVertex *)
Definition: trimline.cc:58
TrimVertex * last(void)
Definition: trimline.h:99
TrimVertex * next(void)
Definition: trimline.h:81
REAL * uarray
Definition: uarray.h:52
#define assert(x)
Definition: debug.h:53
GLdouble GLdouble GLdouble GLdouble top
Definition: glext.h:10859
GLdouble GLdouble right
Definition: glext.h:10859
GLint left
Definition: glext.h:7726
REAL vval
Definition: gridline.h:41
long uend
Definition: gridline.h:44
long ustart
Definition: gridline.h:43
long vindex
Definition: gridline.h:42
long index
Definition: hull.h:59
Trimline * left
Definition: hull.h:56
Trimline * right
Definition: hull.h:58
Gridline * line
Definition: hull.h:57