2 * Copyright (c) 1993-1997, Silicon Graphics, Inc.
4 * Permission to use, copy, modify, and distribute this software for
5 * any purpose and without fee is hereby granted, provided that the above
6 * copyright notice appear in all copies and that both the copyright notice
7 * and this permission notice appear in supporting documentation, and that
8 * the name of Silicon Graphics, Inc. not be used in advertising
9 * or publicity pertaining to distribution of the software without specific,
10 * written prior permission.
12 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
13 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
14 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
15 * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
16 * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
17 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
18 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
19 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
20 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
21 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
22 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
23 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
25 * US Government Users Restricted Rights
26 * Use, duplication, or disclosure by the Government is subject to
27 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
28 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
29 * clause at DFARS 252.227-7013 and/or in similar or successor
30 * clauses in the FAR or the DOD or NASA FAR Supplement.
31 * Unpublished-- rights reserved under the copyright laws of the
32 * United States. Contractor/manufacturer is Silicon Graphics,
33 * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
35 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
40 * This program draws shows how to draw anti-aliased lines. It draws
41 * two diagonal lines to form an X; when 'r' is typed in the window,
42 * the lines are rotated in opposite directions.
48 static float rotAngle
= 0.;
50 /* Initialize antialiasing for RGBA mode, including alpha
51 * blending, hint, and line width. Print out implementation
52 * specific info on line width granularity and width.
54 static void init(void)
57 glGetFloatv (GL_LINE_WIDTH_GRANULARITY
, values
);
58 printf ("GL_LINE_WIDTH_GRANULARITY value is %3.1f\n", values
[0]);
60 glGetFloatv (GL_LINE_WIDTH_RANGE
, values
);
61 printf ("GL_LINE_WIDTH_RANGE values are %3.1f %3.1f\n",
62 values
[0], values
[1]);
64 glEnable (GL_LINE_SMOOTH
);
66 glBlendFunc (GL_SRC_ALPHA
, GL_ONE_MINUS_SRC_ALPHA
);
67 glHint (GL_LINE_SMOOTH_HINT
, GL_DONT_CARE
);
70 glClearColor(0.0, 0.0, 0.0, 0.0);
73 /* Draw 2 diagonal lines to form an X
75 static void display(void)
77 glClear(GL_COLOR_BUFFER_BIT
);
79 glColor3f (0.0, 1.0, 0.0);
81 glRotatef(-rotAngle
, 0.0, 0.0, 0.1);
83 glVertex2f (-0.5, 0.5);
84 glVertex2f (0.5, -0.5);
88 glColor3f (0.0, 0.0, 1.0);
90 glRotatef(rotAngle
, 0.0, 0.0, 0.1);
92 glVertex2f (0.5, 0.5);
93 glVertex2f (-0.5, -0.5);
100 static void reshape(int w
, int h
)
102 glViewport(0, 0, w
, h
);
103 glMatrixMode(GL_PROJECTION
);
106 gluOrtho2D (-1.0, 1.0,
107 -1.0*(GLfloat
)h
/(GLfloat
)w
, 1.0*(GLfloat
)h
/(GLfloat
)w
);
109 gluOrtho2D (-1.0*(GLfloat
)w
/(GLfloat
)h
,
110 1.0*(GLfloat
)w
/(GLfloat
)h
, -1.0, 1.0);
111 glMatrixMode(GL_MODELVIEW
);
116 static void keyboard(unsigned char key
, int x
, int y
)
122 if (rotAngle
>= 360.) rotAngle
= 0.;
125 case 27: /* Escape Key */
134 * Open window with initial window size, title bar,
135 * RGBA display mode, and handle input events.
137 int main(int argc
, char** argv
)
139 glutInit(&argc
, argv
);
140 glutInitDisplayMode (GLUT_SINGLE
| GLUT_RGB
);
141 glutInitWindowSize (200, 200);
142 glutCreateWindow (argv
[0]);
144 glutReshapeFunc (reshape
);
145 glutKeyboardFunc (keyboard
);
146 glutDisplayFunc (display
);