2 * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
4 * Permission to use, copy, modify, distribute, and sell this software and
5 * its documentation for any purpose is hereby granted without fee, provided
6 * that (i) the above copyright notices and this permission notice appear in
7 * all copies of the software and related documentation, and (ii) the name of
8 * Silicon Graphics may not be used in any advertising or
9 * publicity relating to the software without the specific, prior written
10 * permission of Silicon Graphics.
12 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
17 * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
18 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
32 #define CI_OFFSET_1 16
33 #define CI_OFFSET_2 32
38 static void Init(void)
40 fprintf(stderr
, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER
));
41 fprintf(stderr
, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION
));
42 fprintf(stderr
, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR
));
44 glClearColor(0.0, 0.0, 1.0, 0.0);
48 GLubyte tex3d
[SIZE
][SIZE
][SIZE
][3];
51 for (s
= 0; s
< SIZE
; s
++) {
52 for (t
= 0; t
< SIZE
; t
++) {
53 for (r
= 0; r
< SIZE
; r
++) {
55 tex3d
[r
][t
][s
][0] = (s
< SIZE
/2) ? 0 : 255;
56 tex3d
[r
][t
][s
][1] = (t
< SIZE
/2) ? 0 : 255;
57 tex3d
[r
][t
][s
][2] = (r
< SIZE
/2) ? 0 : 255;
59 tex3d
[r
][t
][s
][0] = s
*255/(SIZE
-1);
60 tex3d
[r
][t
][s
][1] = t
*255/(SIZE
-1);
61 tex3d
[r
][t
][s
][2] = r
*255/(SIZE
-1);
67 glTexEnvf(GL_TEXTURE_ENV
, GL_TEXTURE_ENV_MODE
, GL_REPLACE
);
68 glTexParameterf(GL_TEXTURE_3D
, GL_TEXTURE_WRAP_R
, GL_REPEAT
);
69 glTexParameterf(GL_TEXTURE_3D
, GL_TEXTURE_MIN_FILTER
, GL_NEAREST
);
70 glTexParameterf(GL_TEXTURE_3D
, GL_TEXTURE_MAG_FILTER
, GL_NEAREST
);
72 glPixelStorei(GL_UNPACK_ALIGNMENT
, 1);
73 glTexImage3D(GL_TEXTURE_3D
, 0, 3, SIZE
, SIZE
, SIZE
, 0,
74 GL_RGB
, GL_UNSIGNED_BYTE
, tex3d
);
75 glPixelStorei(GL_UNPACK_ALIGNMENT
, 4);
76 glEnable(GL_TEXTURE_3D
);
81 static void Reshape(int width
, int height
)
84 glViewport(0, 0, (GLint
)width
, (GLint
)height
);
86 glMatrixMode(GL_PROJECTION
);
88 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
89 glMatrixMode(GL_MODELVIEW
);
92 static void Key(unsigned char key
, int x
, int y
)
105 static void Draw(void)
107 glClear(GL_COLOR_BUFFER_BIT
);
109 glBegin(GL_TRIANGLES
);
110 glTexCoord3f( 0,0,.9);
111 glVertex3f( 0.9, -0.9, -30.0);
112 glTexCoord3f(.9,0,0);
113 glVertex3f( 0.9, 0.9, -30.0);
114 glTexCoord3f(0,.9,0);
115 glVertex3f(-0.9, 0.0, -30.0);
125 static GLenum
Args(int argc
, char **argv
)
129 doubleBuffer
= GL_FALSE
;
131 for (i
= 1; i
< argc
; i
++) {
132 if (strcmp(argv
[i
], "-sb") == 0) {
133 doubleBuffer
= GL_FALSE
;
134 } else if (strcmp(argv
[i
], "-db") == 0) {
135 doubleBuffer
= GL_TRUE
;
137 fprintf(stderr
, "%s (Bad option).\n", argv
[i
]);
144 int main(int argc
, char **argv
)
148 glutInit(&argc
, argv
);
150 if (Args(argc
, argv
) == GL_FALSE
) {
154 glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
156 type
= GLUT_RGB
| GLUT_ALPHA
;
157 type
|= (doubleBuffer
) ? GLUT_DOUBLE
: GLUT_SINGLE
;
158 glutInitDisplayMode(type
);
160 if (glutCreateWindow(*argv
) == GL_FALSE
) {
168 glutReshapeFunc(Reshape
);
169 glutKeyboardFunc(Key
);
170 glutDisplayFunc(Draw
);