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Diffstat (limited to 'progs/redbook/teaambient.c')
| -rw-r--r-- | progs/redbook/teaambient.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/progs/redbook/teaambient.c b/progs/redbook/teaambient.c new file mode 100644 index 00000000000..62c091c70a6 --- /dev/null +++ b/progs/redbook/teaambient.c @@ -0,0 +1,148 @@ + +/* 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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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. + */ +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); +} + +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(); +} + +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); +} + +/* 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); + glutMainLoop(); + return 0; /* ANSI C requires main to return int. */ +} |