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/* 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* Unpublished-- rights reserved under the copyright laws of the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.
*/
/**
* teaambient.c
* This program renders three lighted, shaded teapots, with
* different ambient values.
*/
#include <stdlib.h>
#include <GL/glut.h>
/* Initialize light source and lighting model.
*/
static void
myinit(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};
/* light_position is NOT default value */
GLfloat light_position[] =
{1.0, 0.0, 0.0, 0.0};
GLfloat global_ambient[] =
{0.75, 0.75, 0.75, 1.0};
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);
glFrontFace(GL_CW);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_AUTO_NORMAL);
glEnable(GL_NORMALIZE);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
}
static void
display(void)
{
GLfloat low_ambient[] =
{0.1, 0.1, 0.1, 1.0};
GLfloat more_ambient[] =
{0.4, 0.4, 0.4, 1.0};
GLfloat most_ambient[] =
{1.0, 1.0, 1.0, 1.0};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* material has small ambient reflection */
glMaterialfv(GL_FRONT, GL_AMBIENT, low_ambient);
glMaterialf(GL_FRONT, GL_SHININESS, 40.0);
glPushMatrix();
glTranslatef(0.0, 2.0, 0.0);
glutSolidTeapot(1.0);
glPopMatrix();
/* material has moderate ambient reflection */
glMaterialfv(GL_FRONT, GL_AMBIENT, more_ambient);
glPushMatrix();
glTranslatef(0.0, 0.0, 0.0);
glutSolidTeapot(1.0);
glPopMatrix();
/* material has large ambient reflection */
glMaterialfv(GL_FRONT, GL_AMBIENT, most_ambient);
glPushMatrix();
glTranslatef(0.0, -2.0, 0.0);
glutSolidTeapot(1.0);
glPopMatrix();
glFlush();
}
static void
myReshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h)
glOrtho(-4.0, 4.0, -4.0 * (GLfloat) h / (GLfloat) w,
4.0 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
else
glOrtho(-4.0 * (GLfloat) w / (GLfloat) h,
4.0 * (GLfloat) w / (GLfloat) h, -4.0, 4.0, -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, 500);
glutCreateWindow(argv[0]);
myinit();
glutReshapeFunc(myReshape);
glutDisplayFunc(display);
glutKeyboardFunc(key);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
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