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
31 #define CI_OFFSET_1 16
32 #define CI_OFFSET_2 32
37 static void Init(void)
39 fprintf(stderr
, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER
));
40 fprintf(stderr
, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION
));
41 fprintf(stderr
, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR
));
44 glClearColor(0.0, 0.0, 1.0, 0.0);
48 GLubyte tex2d
[SIZE
][SIZE
][4];
51 for (s
= 0; s
< SIZE
; s
++) {
52 for (t
= 0; t
< SIZE
; t
++) {
53 tex2d
[t
][s
][0] = (s
< SIZE
/2) ? 0 : 255;
54 tex2d
[t
][s
][1] = (t
< SIZE
/2) ? 0 : 255;
56 tex2d
[t
][s
][3] = ((t
^s
) & 3) * 63;
60 glTexEnvf(GL_TEXTURE_ENV
, GL_TEXTURE_ENV_MODE
, GL_REPLACE
);
61 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_WRAP_R
, GL_REPEAT
);
62 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MIN_FILTER
, GL_NEAREST
);
63 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MAG_FILTER
, GL_NEAREST
);
65 glPixelStorei(GL_UNPACK_ALIGNMENT
, 1);
66 glTexImage2D(GL_TEXTURE_2D
, 0, 4, SIZE
, SIZE
, 0,
67 GL_RGBA
, GL_UNSIGNED_BYTE
, tex2d
);
68 glPixelStorei(GL_UNPACK_ALIGNMENT
, 4);
69 glEnable(GL_TEXTURE_2D
);
73 static void Reshape(int width
, int height
)
76 glViewport(0, 0, (GLint
)width
, (GLint
)height
);
78 glMatrixMode(GL_PROJECTION
);
80 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
81 glMatrixMode(GL_MODELVIEW
);
84 static void Key(unsigned char key
, int x
, int y
)
97 static void Draw(void)
99 glClear(GL_COLOR_BUFFER_BIT
);
101 glDisable(GL_DEPTH_TEST
);
102 glDisable(GL_STENCIL_TEST
);
103 glEnable(GL_ALPHA_TEST
);
104 glAlphaFunc(GL_GEQUAL
, 0.5);
108 glVertex3f( 0.9, -0.9, -30.0);
110 glVertex3f( 0.9, 0.9, -30.0);
112 glVertex3f(-0.9, 0.9, -30.0);
114 glVertex3f(-0.9, -0.9, -30.0);
117 glBegin(GL_TRIANGLES
);
119 glVertex3f( 0.9, -0.9, -30.0);
120 glColor4f(.8,0,0,.5);
121 glVertex3f( 0.9, 0.9, -30.0);
123 glVertex3f(-0.9, 0.0, -30.0);
134 static GLenum
Args(int argc
, char **argv
)
138 doubleBuffer
= GL_FALSE
;
140 for (i
= 1; i
< argc
; i
++) {
141 if (strcmp(argv
[i
], "-sb") == 0) {
142 doubleBuffer
= GL_FALSE
;
143 } else if (strcmp(argv
[i
], "-db") == 0) {
144 doubleBuffer
= GL_TRUE
;
146 fprintf(stderr
, "%s (Bad option).\n", argv
[i
]);
153 int main(int argc
, char **argv
)
157 glutInit(&argc
, argv
);
159 if (Args(argc
, argv
) == GL_FALSE
) {
163 glutInitWindowPosition(100, 0); glutInitWindowSize( 250, 250);
166 type
|= (doubleBuffer
) ? GLUT_DOUBLE
: GLUT_SINGLE
;
167 glutInitDisplayMode(type
);
169 if (glutCreateWindow(*argv
) == GL_FALSE
) {
175 glutReshapeFunc(Reshape
);
176 glutKeyboardFunc(Key
);
177 glutDisplayFunc(Draw
);