2 * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
4 * Permission to use, copy, modify, distribute, and sell this software and
5 * its documentation for any purpose is hereby granted without fee, provided
6 * that (i) the above copyright notices and this permission notice appear in
7 * all copies of the software and related documentation, and (ii) the name of
8 * Silicon Graphics may not be used in any advertising or
9 * publicity relating to the software without the specific, prior written
10 * permission of Silicon Graphics.
12 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
17 * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
18 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
32 #define CI_OFFSET_1 16
33 #define CI_OFFSET_2 32
37 GLboolean smooth
= GL_TRUE
;
41 static void Init(void)
43 float range
[2], aarange
[2];
44 fprintf(stderr
, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER
));
45 fprintf(stderr
, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION
));
46 fprintf(stderr
, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR
));
48 glGetFloatv(GL_LINE_WIDTH_RANGE
, aarange
);
49 glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE
, range
);
50 printf("Non-AA line width range: %f .. %f\n", range
[0], range
[1]);
51 printf("AA line width range: %f .. %f\n", aarange
[0], aarange
[1]);
56 static void Reshape(int width
, int height
)
58 glViewport(0, 0, (GLint
)width
, (GLint
)height
);
59 glMatrixMode(GL_PROJECTION
);
61 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
62 glMatrixMode(GL_MODELVIEW
);
64 glTranslatef(0, 0, -30);
67 static void Key(unsigned char key
, int x
, int y
)
86 printf("LineWidth: %g\n", width
);
91 static void Draw(void)
95 glClear(GL_COLOR_BUFFER_BIT
);
100 glBlendFunc(GL_SRC_ALPHA
, GL_ONE_MINUS_SRC_ALPHA
);
102 glEnable(GL_LINE_SMOOTH
);
108 for (a
= 0; a
< 3.14159; a
+= 0.2) {
109 float x
= .9 * cos(a
);
110 float y
= .9 * sin(a
);
117 glDisable(GL_LINE_SMOOTH
);
127 static GLenum
Args(int argc
, char **argv
)
131 doubleBuffer
= GL_FALSE
;
133 for (i
= 1; i
< argc
; i
++) {
134 if (strcmp(argv
[i
], "-sb") == 0) {
135 doubleBuffer
= GL_FALSE
;
136 } else if (strcmp(argv
[i
], "-db") == 0) {
137 doubleBuffer
= GL_TRUE
;
139 fprintf(stderr
, "%s (Bad option).\n", argv
[i
]);
147 int main(int argc
, char **argv
)
151 glutInit(&argc
, argv
);
153 if (Args(argc
, argv
) == GL_FALSE
) {
157 glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
160 type
|= (doubleBuffer
) ? GLUT_DOUBLE
: GLUT_SINGLE
;
161 glutInitDisplayMode(type
);
163 if (glutCreateWindow(argv
[0]) == GL_FALSE
) {
169 glutReshapeFunc(Reshape
);
170 glutKeyboardFunc(Key
);
171 glutDisplayFunc(Draw
);