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31 * Unpublished-- rights reserved under the copyright laws of the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 * When the left mouse button is pressed, this program
41 * reads the mouse position and determines two 3D points
42 * from which it was transformed. Very little is displayed.
48 static void display(void)
50 glClear(GL_COLOR_BUFFER_BIT
);
54 /* Change these values for a different transformation */
55 static void reshape(int w
, int h
)
57 glViewport (0, 0, (GLsizei
) w
, (GLsizei
) h
);
58 glMatrixMode(GL_PROJECTION
);
60 gluPerspective (45.0, (GLfloat
) w
/(GLfloat
) h
, 1.0, 100.0);
61 glMatrixMode(GL_MODELVIEW
);
65 static void mouse(int button
, int state
, int x
, int y
)
68 GLdouble mvmatrix
[16], projmatrix
[16];
69 GLint realy
; /* OpenGL y coordinate position */
70 GLdouble wx
, wy
, wz
; /* returned world x, y, z coords */
73 case GLUT_LEFT_BUTTON
:
74 if (state
== GLUT_DOWN
) {
75 glGetIntegerv (GL_VIEWPORT
, viewport
);
76 glGetDoublev (GL_MODELVIEW_MATRIX
, mvmatrix
);
77 glGetDoublev (GL_PROJECTION_MATRIX
, projmatrix
);
78 /* note viewport[3] is height of window in pixels */
79 realy
= viewport
[3] - (GLint
) y
- 1;
80 printf ("Coordinates at cursor are (%4d, %4d)\n", x
, realy
);
81 gluUnProject ((GLdouble
) x
, (GLdouble
) realy
, 0.0,
82 mvmatrix
, projmatrix
, viewport
, &wx
, &wy
, &wz
);
83 printf ("World coords at z=0.0 are (%f, %f, %f)\n",
85 gluUnProject ((GLdouble
) x
, (GLdouble
) realy
, 1.0,
86 mvmatrix
, projmatrix
, viewport
, &wx
, &wy
, &wz
);
87 printf ("World coords at z=1.0 are (%f, %f, %f)\n",
91 case GLUT_RIGHT_BUTTON
:
92 if (state
== GLUT_DOWN
)
101 static void keyboard(unsigned char key
, int x
, int y
)
111 * Open window, register input callback functions
113 int main(int argc
, char** argv
)
115 glutInit(&argc
, argv
);
116 glutInitDisplayMode (GLUT_SINGLE
| GLUT_RGB
);
117 glutInitWindowSize (500, 500);
118 glutInitWindowPosition (100, 100);
119 glutCreateWindow (argv
[0]);
120 glutDisplayFunc(display
);
121 glutReshapeFunc(reshape
);
122 glutKeyboardFunc (keyboard
);
123 glutMouseFunc(mouse
);