/* * 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 * Unpublished-- rights reserved under the copyright laws of the * United States.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. */ /* * polyoff.c * This program demonstrates polygon offset to draw a shaded * polygon and its wireframe counterpart without ugly visual * artifacts ("stitching"). */ #include #include #include #ifdef GL_VERSION_1_1 GLuint list; GLint spinx = 0; GLint spiny = 0; GLfloat tdist = 0.0; GLfloat polyfactor = 1.0; GLfloat polyunits = 1.0; /* display() draws two spheres, one with a gray, diffuse material, * the other sphere with a magenta material with a specular highlight. */ void display (void) { GLfloat gray[] = { 0.8, 0.8, 0.8, 1.0 }; GLfloat black[] = { 0.0, 0.0, 0.0, 1.0 }; glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix (); glTranslatef (0.0, 0.0, tdist); glRotatef ((GLfloat) spinx, 1.0, 0.0, 0.0); glRotatef ((GLfloat) spiny, 0.0, 1.0, 0.0); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, gray); glMaterialfv(GL_FRONT, GL_SPECULAR, black); glMaterialf(GL_FRONT, GL_SHININESS, 0.0); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_POLYGON_OFFSET_FILL); glPolygonOffset(polyfactor, polyunits); glCallList (list); glDisable(GL_POLYGON_OFFSET_FILL); glDisable(GL_LIGHTING); glDisable(GL_LIGHT0); glColor3f (1.0, 1.0, 1.0); glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); glCallList (list); glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); glPopMatrix (); glFlush (); } /* specify initial properties * create display list with sphere * initialize lighting and depth buffer */ void gfxinit (void) { GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 }; GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 }; GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 }; GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 }; GLfloat global_ambient[] = { 0.2, 0.2, 0.2, 1.0 }; glClearColor (0.0, 0.0, 0.0, 1.0); list = glGenLists(1); glNewList (list, GL_COMPILE); glutSolidSphere(1.0, 20, 12); glEndList (); glEnable(GL_DEPTH_TEST); glLightfv (GL_LIGHT0, GL_AMBIENT, light_ambient); glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse); glLightfv (GL_LIGHT0, GL_SPECULAR, light_specular); glLightfv (GL_LIGHT0, GL_POSITION, light_position); glLightModelfv (GL_LIGHT_MODEL_AMBIENT, global_ambient); } /* call when window is resized */ void reshape(int width, int height) { glViewport (0, 0, width, height); glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective(45.0, (GLdouble)width/(GLdouble)height, 1.0, 10.0); glMatrixMode (GL_MODELVIEW); glLoadIdentity (); gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); } /* call when mouse button is pressed */ /* ARGSUSED2 */ void mouse(int button, int state, int x, int y) { switch (button) { case GLUT_LEFT_BUTTON: switch (state) { case GLUT_DOWN: spinx = (spinx + 5) % 360; glutPostRedisplay(); break; default: break; } break; case GLUT_MIDDLE_BUTTON: switch (state) { case GLUT_DOWN: spiny = (spiny + 5) % 360; glutPostRedisplay(); break; default: break; } break; case GLUT_RIGHT_BUTTON: switch (state) { case GLUT_UP: exit(0); break; default: break; } break; default: break; } } /* ARGSUSED1 */ void keyboard (unsigned char key, int x, int y) { switch (key) { case 't': if (tdist < 4.0) { tdist = (tdist + 0.5); glutPostRedisplay(); } break; case 'T': if (tdist > -5.0) { tdist = (tdist - 0.5); glutPostRedisplay(); } break; case 'F': polyfactor = polyfactor + 0.1; printf ("polyfactor is %f\n", polyfactor); glutPostRedisplay(); break; case 'f': polyfactor = polyfactor - 0.1; printf ("polyfactor is %f\n", polyfactor); glutPostRedisplay(); break; case 'U': polyunits = polyunits + 1.0; printf ("polyunits is %f\n", polyunits); glutPostRedisplay(); break; case 'u': polyunits = polyunits - 1.0; printf ("polyunits is %f\n", polyunits); glutPostRedisplay(); break; default: break; } } /* Main Loop * Open window with initial window size, title bar, * RGBA display mode, and handle input events. */ int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); glutCreateWindow(argv[0]); glutReshapeFunc(reshape); glutDisplayFunc(display); glutMouseFunc(mouse); glutKeyboardFunc(keyboard); gfxinit(); glutMainLoop(); return 0; } #else int main(int argc, char** argv) { fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n"); fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n"); fprintf (stderr, "you may be able to modify this program to make it run.\n"); return 0; } #endif