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+/*
+ * 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+ * Unpublished-- rights reserved under the copyright laws of the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 <GL/glut.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#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
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