2 /* Copyright (c) Mark J. Kilgard, 1994. */
5 * (c) Copyright 1993, Silicon Graphics, Inc.
7 * Permission to use, copy, modify, and distribute this software for
8 * any purpose and without fee is hereby granted, provided that the above
9 * copyright notice appear in all copies and that both the copyright notice
10 * and this permission notice appear in supporting documentation, and that
11 * the name of Silicon Graphics, Inc. not be used in advertising
12 * or publicity pertaining to distribution of the software without specific,
13 * written prior permission.
15 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
16 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
18 * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
19 * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
20 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
21 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
22 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
23 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
24 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
25 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
26 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
28 * US Government Users Restricted Rights
29 * Use, duplication, or disclosure by the Government is subject to
30 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
31 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
32 * clause at DFARS 252.227-7013 and/or in similar or successor
33 * clauses in the FAR or the DOD or NASA FAR Supplement.
34 * Unpublished-- rights reserved under the copyright laws of the
35 * United States. Contractor/manufacturer is Silicon Graphics,
36 * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
38 * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
42 * This program draws 5 red teapots, each at a different
43 * z distance from the eye, in different types of fog.
44 * Pressing the left mouse button chooses between 3 types of
45 * fog: exponential, exponential squared, and linear.
46 * In this program, there is a fixed density value, as well
47 * as fixed start and end values for the linear fog.
60 glFogf(GL_FOG_START
, 1.0);
61 glFogf(GL_FOG_END
, 5.0);
65 glFogi(GL_FOG_MODE
, mode
);
73 /* Initialize z-buffer, projection matrix, light source,
74 * and lighting model. Do not specify a material property here.
81 GLfloat local_view
[] =
84 glEnable(GL_DEPTH_TEST
);
87 glLightfv(GL_LIGHT0
, GL_POSITION
, position
);
88 glLightModelfv(GL_LIGHT_MODEL_LOCAL_VIEWER
, local_view
);
91 glEnable(GL_LIGHTING
);
93 glEnable(GL_AUTO_NORMAL
);
94 glEnable(GL_NORMALIZE
);
101 glFogi(GL_FOG_MODE
, fogMode
);
102 glFogfv(GL_FOG_COLOR
, fogColor
);
103 glFogf(GL_FOG_DENSITY
, 0.35);
104 glHint(GL_FOG_HINT
, GL_DONT_CARE
);
105 glClearColor(0.5, 0.5, 0.5, 1.0);
110 renderRedTeapot(GLfloat x
, GLfloat y
, GLfloat z
)
115 glTranslatef(x
, y
, z
);
120 glMaterialfv(GL_FRONT
, GL_AMBIENT
, mat
);
124 glMaterialfv(GL_FRONT
, GL_DIFFUSE
, mat
);
128 glMaterialfv(GL_FRONT
, GL_SPECULAR
, mat
);
129 glMaterialf(GL_FRONT
, GL_SHININESS
, 0.6 * 128.0);
130 glutSolidTeapot(1.0);
134 /* display() draws 5 teapots at different z positions.
139 glClear(GL_COLOR_BUFFER_BIT
| GL_DEPTH_BUFFER_BIT
);
140 renderRedTeapot(-4.0, -0.5, -1.0);
141 renderRedTeapot(-2.0, -0.5, -2.0);
142 renderRedTeapot(0.0, -0.5, -3.0);
143 renderRedTeapot(2.0, -0.5, -4.0);
144 renderRedTeapot(4.0, -0.5, -5.0);
149 myReshape(int w
, int h
)
151 glViewport(0, 0, w
, h
);
152 glMatrixMode(GL_PROJECTION
);
155 glOrtho(-6.0, 6.0, -2.0 * ((GLfloat
) h
* 3) / (GLfloat
) w
,
156 2.0 * ((GLfloat
) h
* 3) / (GLfloat
) w
, 0.0, 10.0);
158 glOrtho(-6.0 * (GLfloat
) w
/ ((GLfloat
) h
* 3),
159 6.0 * (GLfloat
) w
/ ((GLfloat
) h
* 3), -2.0, 2.0, 0.0, 10.0);
160 glMatrixMode(GL_MODELVIEW
);
165 key(unsigned char k
, int x
, int y
)
168 case 27: /* Escape */
178 * Open window with initial window size, title bar,
179 * RGBA display mode, depth buffer, and handle input events.
182 main(int argc
, char **argv
)
184 glutInit(&argc
, argv
);
185 glutInitDisplayMode(GLUT_SINGLE
| GLUT_RGB
| GLUT_DEPTH
);
186 glutInitWindowSize(450, 150);
187 glutCreateWindow(argv
[0]);
189 glutReshapeFunc(myReshape
);
190 glutDisplayFunc(display
);
191 glutCreateMenu(selectFog
);
192 glutAddMenuEntry("Fog EXP", GL_EXP
);
193 glutAddMenuEntry("Fog EXP2", GL_EXP2
);
194 glutAddMenuEntry("Fog LINEAR", GL_LINEAR
);
195 glutAddMenuEntry("Quit", 0);
196 glutAttachMenu(GLUT_RIGHT_BUTTON
);
197 glutKeyboardFunc(key
);
199 return 0; /* ANSI C requires main to return int. */