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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 1.iso
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toolbox
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exampleCode
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opengl
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GLUT
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examples
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scene.c
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1996-11-11
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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* Unpublished-- rights reserved under the copyright laws of the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.
*/
/*
* scene.c
* This program demonstrates the use of the GL lighting model.
* Objects are drawn using a grey material characteristic.
* A single light source illuminates the objects.
*/
#include <stdlib.h>
#include <GL/glut.h>
/* Initialize material property and light source.
*/
void
myinit(void)
{
GLfloat light_ambient[] =
{0.0, 0.0, 0.0, 1.0};
GLfloat light_diffuse[] =
{1.0, 0.0, 0.0, 1.0};
GLfloat light_specular[] =
{1.0, 1.0, 1.0, 1.0};
/* light_position is NOT default value */
GLfloat light_position[] =
{1.0, 1.0, 1.0, 0.0};
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);
glEnable(GL_LIGHT0);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
}
void
display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glScalef(1.3, 1.3, 1.3);
glRotatef(20.0, 1.0, 0.0, 0.0);
glPushMatrix();
glTranslatef(-0.75, 0.5, 0.0);
glRotatef(90.0, 1.0, 0.0, 0.0);
glutSolidTorus(0.275, 0.85, 10, 15);
glPopMatrix();
glPushMatrix();
glTranslatef(-0.75, -0.5, 0.0);
glRotatef(270.0, 1.0, 0.0, 0.0);
glutSolidTetrahedron();
glPopMatrix();
glPushMatrix();
glTranslatef(0.75, 0.0, -1.0);
glutSolidIcosahedron();
glPopMatrix();
glPopMatrix();
glFlush();
}
void
myReshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h)
glOrtho(-2.5, 2.5, -2.5 * (GLfloat) h / (GLfloat) w,
2.5 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
else
glOrtho(-2.5 * (GLfloat) w / (GLfloat) h,
2.5 * (GLfloat) w / (GLfloat) h, -2.5, 2.5, -10.0, 10.0);
glMatrixMode(GL_MODELVIEW);
}
void
polygon_mode(int value)
{
switch (value) {
case 1:
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glDisable(GL_BLEND);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
break;
case 2:
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glColor3f(1.0, 1.0, 1.0);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
break;
}
glutPostRedisplay();
}
void
main_menu(int value)
{
if (value == 666)
exit(0);
}
/* Main Loop
* Open window with initial window size, title bar,
* RGBA display mode, and handle input events.
*/
int
main(int argc, char **argv)
{
int submenu;
glutInit(&argc, argv);
glutInitWindowPosition(500, 500);
glutInitWindowSize(500, 500);
glutCreateWindow(argv[0]);
myinit();
glutReshapeFunc(myReshape);
glutDisplayFunc(display);
submenu = glutCreateMenu(polygon_mode);
glutAddMenuEntry("Filled", 1);
glutAddMenuEntry("Outline", 2);
glutCreateMenu(main_menu);
glutAddMenuEntry("Quit", 666);
glutAddSubMenu("Polygon mode", submenu);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}