Very little is displayed.
/* * Copyright (c) 1993-1997, 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 * Unpublished-- rights reserved under the copyright laws of the * United States.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(R) is a registered trademark of Silicon Graphics, Inc. */ #include <GL/openglut.h> #include <stdlib.h> #include <stdio.h> void display(void) { glClear(GL_COLOR_BUFFER_BIT); glFlush(); } /* Change these values for a different transformation */ void reshape(int w, int h) { glViewport (0, 0, (GLsizei) w, (GLsizei) h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective (45.0, (GLfloat) w/(GLfloat) h, 1.0, 100.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void mouse(int button, int state, int x, int y) { GLint viewport[4]; GLdouble mvmatrix[16], projmatrix[16]; GLint realy; /* OpenGL y coordinate position */ GLdouble wx, wy, wz; /* returned world x, y, z coords */ switch (button) { case GLUT_LEFT_BUTTON: if (state == GLUT_DOWN) { glGetIntegerv (GL_VIEWPORT, viewport); glGetDoublev (GL_MODELVIEW_MATRIX, mvmatrix); glGetDoublev (GL_PROJECTION_MATRIX, projmatrix); /* note viewport[3] is height of window in pixels */ realy = viewport[3] - (GLint) y - 1; printf ("Coordinates at cursor are (%4d, %4d)\n", x, realy); gluUnProject ((GLdouble) x, (GLdouble) realy, 0.0, mvmatrix, projmatrix, viewport, &wx, &wy, &wz); printf ("World coords at z=0.0 are (%f, %f, %f)\n", wx, wy, wz); gluUnProject ((GLdouble) x, (GLdouble) realy, 1.0, mvmatrix, projmatrix, viewport, &wx, &wy, &wz); printf ("World coords at z=1.0 are (%f, %f, %f)\n", wx, wy, wz); } break; case GLUT_RIGHT_BUTTON: if (state == GLUT_DOWN) exit(0); break; default: break; } } /* ARGSUSED1 */ void keyboard(unsigned char key, int x, int y) { switch (key) { case 27: exit(0); break; } } /* * Open window, register input callback functions */ int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100); glutCreateWindow (argv[0]); glutDisplayFunc(display); glutReshapeFunc(reshape); glutKeyboardFunc (keyboard); glutMouseFunc(mouse); glutMainLoop(); return 0; }