/* Copyright (c) Mark J. Kilgard, 1994. */
/**
* (c) Copyright 1993, 1994, 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* Unpublished-- rights reserved under the copyright laws of the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.
*/
/*----------------------------------------------------------------------------
*
* olight.c : openGL (motif) example showing how to do hardware lighting
* including two_sided lighting.
*
* Author : Yusuf Attarwala
* SGI - Applications
* Date : Mar 93
*
* press left button for animation
* middle button for two sided lighting (default)
* right button for single sided lighting
*
*
*---------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/glut.h>
/* function declarations */
void
drawScene(void), setMatrix(void), initLightAndMaterial(void),
animation(void), resize(int w, int h), menu(int choice), keyboard(unsigned char c, int x, int y);
/* global variables */
float ax, ay, az; /* angles for animation */
GLUquadricObj *quadObj; /* used in drawscene */
static float lmodel_twoside[] =
{GL_TRUE};
static float lmodel_oneside[] =
{GL_FALSE};
int
main(int argc, char **argv)
{
glutInit(&argc, argv);
quadObj = gluNewQuadric(); /* this will be used in drawScene
*/
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("Two-sided lighting");
ax = 10.0;
ay = -10.0;
az = 0.0;
initLightAndMaterial();
glutDisplayFunc(drawScene);
glutReshapeFunc(resize);
glutCreateMenu(menu);
glutAddMenuEntry("Motion", 3);
glutAddMenuEntry("Two-sided lighting", 1);
glutAddMenuEntry("One-sided lighting", 2);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutKeyboardFunc(keyboard);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
void
drawScene(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
gluQuadricDrawStyle(quadObj, GLU_FILL);
glColor3f(1.0, 1.0, 0.0);
glRotatef(ax, 1.0, 0.0, 0.0);
glRotatef(-ay, 0.0, 1.0, 0.0);
gluCylinder(quadObj, 2.0, 5.0, 10.0, 20, 8); /* draw a cone */
glPopMatrix();
glutSwapBuffers();
}
void
setMatrix(void)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-15.0, 15.0, -15.0, 15.0, -10.0, 10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int count = 0;
void
animation(void)
{
ax += 5.0;
ay -= 2.0;
az += 5.0;
if (ax >= 360)
ax = 0.0;
if (ay <= -360)
ay = 0.0;
if (az >= 360)
az = 0.0;
drawScene();
count++;
if (count >= 60)
glutIdleFunc(NULL);
}
/* ARGSUSED1 */
void
keyboard(unsigned char c, int x, int y)
{
switch (c) {
case 27:
exit(0);
break;
default:
break;
}
}
void
menu(int choice)
{
switch (choice) {
case 3:
count = 0;
glutIdleFunc(animation);
break;
case 2:
glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_oneside);
glutSetWindowTitle("One-sided lighting");
glutPostRedisplay();
break;
case 1:
glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
glutSetWindowTitle("Two-sided lighting");
glutPostRedisplay();
break;
}
}
void
resize(int w, int h)
{
glViewport(0, 0, w, h);
setMatrix();
}
void
initLightAndMaterial(void)
{
static float ambient[] =
{0.1, 0.1, 0.1, 1.0};
static float diffuse[] =
{0.5, 1.0, 1.0, 1.0};
static float position[] =
{90.0, 90.0, 150.0, 0.0};
static float front_mat_shininess[] =
{60.0};
static float front_mat_specular[] =
{0.2, 0.2, 0.2, 1.0};
static float front_mat_diffuse[] =
{0.5, 0.5, 0.28, 1.0};
static float back_mat_shininess[] =
{60.0};
static float back_mat_specular[] =
{0.5, 0.5, 0.2, 1.0};
static float back_mat_diffuse[] =
{1.0, 0.9, 0.2, 1.0};
static float lmodel_ambient[] =
{1.0, 1.0, 1.0, 1.0};
setMatrix();
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, position);
glMaterialfv(GL_FRONT, GL_SHININESS, front_mat_shininess);
glMaterialfv(GL_FRONT, GL_SPECULAR, front_mat_specular);
glMaterialfv(GL_FRONT, GL_DIFFUSE, front_mat_diffuse);
glMaterialfv(GL_BACK, GL_SHININESS, back_mat_shininess);
glMaterialfv(GL_BACK, GL_SPECULAR, back_mat_specular);
glMaterialfv(GL_BACK, GL_DIFFUSE, back_mat_diffuse);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glShadeModel(GL_SMOOTH);
}