1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
#
# (c) Copyright 1993, Silicon Graphics, Inc.
# ALL RIGHTS RESERVED
# Permission to use, copy, modify, and distribute this software for
# any purpose and without fee is hereby granted, provided that the above
# copyright notice appear in all copies and that both the copyright notice
# and this permission notice appear in supporting documentation, and that
# the name of Silicon Graphics, Inc. not be used in advertising
# or publicity pertaining to distribution of the software without specific,
# written prior permission.
#
# THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
# AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
# INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
# FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
# GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
# SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
# KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
# LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
# THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
# ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
# POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
#
# US Government Users Restricted Rights
# Use, duplication, or disclosure by the Government is subject to
# restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
# (c)(1)(ii) of the Rights in Technical Data and Computer Software
# clause at DFARS 252.227-7013 and/or in similar or successor
# clauses in the FAR or the DOD or NASA FAR Supplement.
# Unpublished-- rights reserved under the copyright laws of the
# United States. Contractor/manufacturer is Silicon Graphics,
# Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
#
# OpenGL(TM) is a trademark of Silicon Graphics, Inc.
#/
# bezsurf.c
# This program renders a lighted, filled Bezier surface,
# using two-dimensional evaluators.
#/
use opengl;
package opengl;
@ctrlpoints = (
[[-1.5, -1.5, 4.0], [-0.5, -1.5, 2.0], [0.5, -1.5, -1.0],[1.5, -1.5, 2.0]],
[[-1.5, -0.5, 1.0],[-0.5, -0.5, 3.0],[0.5, -0.5, 0.0], [1.5, -0.5, -1.0]],
[[-1.5, 0.5, 4.0], [-0.5, 0.5, 0.0],[0.5, 0.5, 3.0], [1.5, 0.5, 4.0]],
[[-1.5, 1.5, -2.0], [-0.5, 1.5, -2.0], [0.5, 1.5, 0.0], [1.5, 1.5, -1.0]]
);
sub makectrlpts {
my $array = array_float(4*4*3);
my $m = 0;
for ($i = 0; $i < 4; $i++) {
for ($j = 0; $j < 4; $j++) {
for ($k = 0; $k < 3; $k++) {
set_float($array,$m,$ctrlpoints[$i][$j][$k]);
$m++;
}
}
}
return $array;
}
sub initlights {
my $ambient = newfv4(0.2, 0.2, 0.2, 1.0);
my $position = newfv4(0.0,0.0,2.0,1.0);
my $mat_diffuse = newfv4(0.6,0.6,0.6,1.0);
my $mat_specular = newfv4(1.0, 1.0, 1.0, 1.0);
my $mat_shininess = newfv4(50.0,0,0,0);
glEnable($GL_LIGHTING);
glEnable($GL_LIGHT0);
glLightfv($GL_LIGHT0, $GL_AMBIENT, $ambient);
glLightfv($GL_LIGHT0, $GL_POSITION, $position);
glMaterialfv($GL_FRONT, $GL_DIFFUSE, $mat_diffuse);
glMaterialfv($GL_FRONT, $GL_SPECULAR, $mat_specular);
glMaterialfv($GL_FRONT, $GL_SHININESS, $mat_shininess);
}
sub display {
glClear($GL_COLOR_BUFFER_BIT | $GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(85.0, 1.0, 1.0, 1.0);
glEvalMesh2($GL_FILL, 0, 20, 0, 20);
glPopMatrix();
glFlush();
}
sub myinit {
glClearColor (0.0, 0.0, 0.0, 1.0);
glEnable ($GL_DEPTH_TEST);
my $cpoints = makectrlpts();
glMap2f($GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0,1,12,4, $cpoints);
glEnable($GL_MAP2_VERTEX_3);
glEnable($GL_AUTO_NORMAL);
glEnable($GL_NORMALIZE);
glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);
initlights();
free($cpoints);
}
sub myReshape {
my ($w,$h) = @_;
glViewport(0, 0, $w, $h);
glMatrixMode($GL_PROJECTION);
glLoadIdentity();
if ($w <= $h) {
glOrtho(-4.0, 4.0, -4.0*$h/$w, 4.0*$h/$w, -4.0, 4.0);
} else {
glOrtho(-4.0*$w/$h, 4.0*$w/$h, -4.0, 4.0, -4.0, 4.0);
}
glMatrixMode($GL_MODELVIEW);
glLoadIdentity();
}
auxInitDisplayMode ($AUX_SINGLE | $AUX_RGB | $AUX_DEPTH);
auxInitPosition (0, 0, 500, 500);
auxInitWindow ("bezmesh");
myinit();
myReshape(500,500);
display();
sleep(10);
|
