mirror of https://gitlab.freedesktop.org/mesa/mesa
127 lines
4.3 KiB
C
127 lines
4.3 KiB
C
/*
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* Copyright (c) 1993-1997, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
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*/
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/*
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* unproject.c
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* When the left mouse button is pressed, this program
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* reads the mouse position and determines two 3D points
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* from which it was transformed. Very little is displayed.
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*/
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#include <GL/glut.h>
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#include <stdlib.h>
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#include <stdio.h>
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void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glFlush();
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}
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/* Change these values for a different transformation */
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void reshape(int w, int h)
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{
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glViewport (0, 0, (GLsizei) w, (GLsizei) h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective (45.0, (GLfloat) w/(GLfloat) h, 1.0, 100.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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void mouse(int button, int state, int x, int y)
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{
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GLint viewport[4];
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GLdouble mvmatrix[16], projmatrix[16];
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GLint realy; /* OpenGL y coordinate position */
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GLdouble wx, wy, wz; /* returned world x, y, z coords */
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switch (button) {
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case GLUT_LEFT_BUTTON:
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if (state == GLUT_DOWN) {
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glGetIntegerv (GL_VIEWPORT, viewport);
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glGetDoublev (GL_MODELVIEW_MATRIX, mvmatrix);
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glGetDoublev (GL_PROJECTION_MATRIX, projmatrix);
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/* note viewport[3] is height of window in pixels */
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realy = viewport[3] - (GLint) y - 1;
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printf ("Coordinates at cursor are (%4d, %4d)\n", x, realy);
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gluUnProject ((GLdouble) x, (GLdouble) realy, 0.0,
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mvmatrix, projmatrix, viewport, &wx, &wy, &wz);
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printf ("World coords at z=0.0 are (%f, %f, %f)\n",
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wx, wy, wz);
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gluUnProject ((GLdouble) x, (GLdouble) realy, 1.0,
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mvmatrix, projmatrix, viewport, &wx, &wy, &wz);
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printf ("World coords at z=1.0 are (%f, %f, %f)\n",
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wx, wy, wz);
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}
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break;
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case GLUT_RIGHT_BUTTON:
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if (state == GLUT_DOWN)
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exit(0);
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break;
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default:
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break;
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}
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}
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/* ARGSUSED1 */
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void keyboard(unsigned char key, int x, int y)
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{
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switch (key) {
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case 27:
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exit(0);
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break;
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}
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}
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/*
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* Open window, register input callback functions
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*/
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int main(int argc, char** argv)
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{
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glutInit(&argc, argv);
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glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
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glutInitWindowSize (500, 500);
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glutInitWindowPosition (100, 100);
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glutCreateWindow (argv[0]);
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glutDisplayFunc(display);
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glutReshapeFunc(reshape);
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glutKeyboardFunc (keyboard);
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glutMouseFunc(mouse);
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glutMainLoop();
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return 0;
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}
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