/* Copyright (c) Mark J. Kilgard, 1994. */ /* * (c) Copyright 1993, 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 * Unpublished-- rights reserved under the copyright laws of the * United States.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(TM) is a trademark of Silicon Graphics, Inc. */ /* * plane.c * This program demonstrates the use of local versus * infinite lighting on a flat plane. */ #include <stdlib.h> #include <GL/glut.h> /* Initialize material property, light source, and lighting model. */ static void myinit(void) { GLfloat mat_ambient[] = { 0.0, 0.0, 0.0, 1.0 }; /* mat_specular and mat_shininess are NOT default values */ GLfloat mat_diffuse[] = { 0.4, 0.4, 0.4, 1.0 }; GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; GLfloat mat_shininess[] = { 15.0 }; 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 lmodel_ambient[] = { 0.2, 0.2, 0.2, 1.0 }; glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess); glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient); glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular); glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glDepthFunc(GL_LESS); glEnable(GL_DEPTH_TEST); } static void drawPlane(void) { glBegin (GL_QUADS); glNormal3f (0.0, 0.0, 1.0); glVertex3f (-1.0, -1.0, 0.0); glVertex3f (0.0, -1.0, 0.0); glVertex3f (0.0, 0.0, 0.0); glVertex3f (-1.0, 0.0, 0.0); glNormal3f (0.0, 0.0, 1.0); glVertex3f (0.0, -1.0, 0.0); glVertex3f (1.0, -1.0, 0.0); glVertex3f (1.0, 0.0, 0.0); glVertex3f (0.0, 0.0, 0.0); glNormal3f (0.0, 0.0, 1.0); glVertex3f (0.0, 0.0, 0.0); glVertex3f (1.0, 0.0, 0.0); glVertex3f (1.0, 1.0, 0.0); glVertex3f (0.0, 1.0, 0.0); glNormal3f (0.0, 0.0, 1.0); glVertex3f (0.0, 0.0, 0.0); glVertex3f (0.0, 1.0, 0.0); glVertex3f (-1.0, 1.0, 0.0); glVertex3f (-1.0, 0.0, 0.0); glEnd(); } static void display (void) { GLfloat infinite_light[] = { 1.0, 1.0, 1.0, 0.0 }; GLfloat local_light[] = { 1.0, 1.0, 1.0, 1.0 }; glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix (); glTranslatef (-1.5, 0.0, 0.0); glLightfv (GL_LIGHT0, GL_POSITION, infinite_light); drawPlane (); glPopMatrix (); glPushMatrix (); glTranslatef (1.5, 0.0, 0.0); glLightfv (GL_LIGHT0, GL_POSITION, local_light); drawPlane (); glPopMatrix (); glFlush (); } static void myReshape(int w, int h) { glViewport (0, 0, w, h); glMatrixMode (GL_PROJECTION); glLoadIdentity (); if (w <= h) glOrtho (-1.5, 1.5, -1.5*(GLdouble)h/(GLdouble)w, 1.5*(GLdouble)h/(GLdouble)w, -10.0, 10.0); else glOrtho (-1.5*(GLdouble)w/(GLdouble)h, 1.5*(GLdouble)w/(GLdouble)h, -1.5, 1.5, -10.0, 10.0); glMatrixMode (GL_MODELVIEW); } static void key(unsigned char k, int x, int y) { switch (k) { case 27: /* Escape */ exit(0); break; default: return; } glutPostRedisplay(); } /* 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); glutInitWindowSize (500, 200); glutCreateWindow (argv[0]); myinit(); glutReshapeFunc (myReshape); glutDisplayFunc(display); glutKeyboardFunc(key); glutMainLoop(); return 0; /* ANSI C requires main to return int. */ }