FreeWRL / FreeX3D 4.3.0
curvelist.cc
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 * curvelist.c++
37 *
38 */
39
40#include "glimports.h"
41#include "myassert.h"
42#include "mystdio.h"
43#include "quilt.h"
44#include "curvelist.h"
45#include "curve.h"
46#include "nurbsconsts.h"
47#include "types.h"
48
49Curvelist::Curvelist( Quilt *quilts, REAL pta, REAL ptb )
50{
51 curve = 0;
52 for( Quilt *q = quilts; q; q = q->next )
53 curve = new Curve( q, pta, ptb, curve );
54 range[0] = pta;
55 range[1] = ptb;
56 range[2] = ptb - pta;
57}
58
59Curvelist::Curvelist( Curvelist &upper, REAL value )
60{
61 Curvelist &lower = *this;
62 curve = 0;
63 for( Curve *c = upper.curve; c; c = c->next )
64 curve = new Curve( *c, value, curve );
65
66 lower.range[0] = upper.range[0];
67 lower.range[1] = value;
68 lower.range[2] = value - upper.range[0];
69 upper.range[0] = value;
70 upper.range[2] = upper.range[1] - value;
71}
72
73Curvelist::~Curvelist()
74{
75 while( curve ) {
76 Curve *c = curve;
77 curve = curve->next;
78 delete c;
79 }
80}
81
82int
83Curvelist::cullCheck( void )
84{
85 for( Curve *c = curve; c; c = c->next )
86 if( c->cullCheck() == CULL_TRIVIAL_REJECT )
87 return CULL_TRIVIAL_REJECT;
88 return CULL_ACCEPT;
89}
90
91void
92Curvelist::getstepsize( void )
93{
94 stepsize = range[2];
95 Curve *c;
96 for( c = curve; c; c = c->next ) {
97 c->getstepsize();
98 c->clamp();
99 stepsize = ((c->stepsize < stepsize) ? c->stepsize : stepsize);
100 if( c->needsSamplingSubdivision() ) break;
101 }
102 needsSubdivision = ( c ) ? 1 : 0;
103}
104
105int
106Curvelist::needsSamplingSubdivision( void )
107{
108 return needsSubdivision;
109}
110
Definition curve.h:46
Definition quilt.h:64