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
30 static GLenum Target
= GL_TEXTURE_2D
;
31 static GLenum Filter
= GL_NEAREST
;
36 static void Init(void)
38 fprintf(stderr
, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER
));
39 fprintf(stderr
, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION
));
40 fprintf(stderr
, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR
));
43 glClearColor(0.0, 0.0, 1.0, 0.0);
47 GLubyte tex2d
[SIZE
][SIZE
][3];
50 for (s
= 0; s
< SIZE
; s
++) {
51 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;
57 tex2d
[t
][s
][0] = s
*255/(SIZE
-1);
58 tex2d
[t
][s
][1] = t
*255/(SIZE
-1);
64 glPixelStorei(GL_UNPACK_ALIGNMENT
, 1);
66 if (Target
== GL_TEXTURE_1D
)
67 glTexImage1D(Target
, 0, 3, SIZE
, 0, GL_RGB
, GL_UNSIGNED_BYTE
, tex2d
);
69 glTexImage2D(Target
, 0, 3, SIZE
, SIZE
, 0,
70 GL_RGB
, GL_UNSIGNED_BYTE
, tex2d
);
73 glTexEnvf(GL_TEXTURE_ENV
, GL_TEXTURE_ENV_MODE
, GL_REPLACE
);
74 glTexParameterf(Target
, GL_TEXTURE_WRAP_R
, GL_REPEAT
);
75 glTexParameterf(Target
, GL_TEXTURE_MIN_FILTER
, Filter
);
76 glTexParameterf(Target
, GL_TEXTURE_MAG_FILTER
, Filter
);
78 glPixelStorei(GL_UNPACK_ALIGNMENT
, 4);
82 static void Reshape(int width
, int height
)
84 glViewport(0, 0, (GLint
)width
, (GLint
)height
);
85 glMatrixMode(GL_PROJECTION
);
88 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
90 glFrustum(-1, 1, -1, 1, 10, 20);
92 glMatrixMode(GL_MODELVIEW
);
94 glTranslatef(0, 0, -15);
97 static void Key(unsigned char key
, int x
, int y
)
107 glutDestroyWindow(win
);
115 static void Draw(void)
117 glClear(GL_COLOR_BUFFER_BIT
);
120 glRotatef(Rot
, 0, 1, 0);
124 glVertex3f( 0.9, -0.9, 0.0);
126 glVertex3f( 0.9, 0.9, 0.0);
128 glVertex3f(-0.9, 0.9, 0.0);
130 glVertex3f(-0.9, -0.9, 0.0);
142 static GLenum
Args(int argc
, char **argv
)
146 doubleBuffer
= GL_FALSE
;
148 for (i
= 1; i
< argc
; i
++) {
149 if (strcmp(argv
[i
], "-sb") == 0) {
150 doubleBuffer
= GL_FALSE
;
151 } else if (strcmp(argv
[i
], "-db") == 0) {
152 doubleBuffer
= GL_TRUE
;
154 fprintf(stderr
, "%s (Bad option).\n", argv
[i
]);
161 int main(int argc
, char **argv
)
165 glutInit(&argc
, argv
);
167 if (Args(argc
, argv
) == GL_FALSE
) {
171 glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
174 type
|= (doubleBuffer
) ? GLUT_DOUBLE
: GLUT_SINGLE
;
175 glutInitDisplayMode(type
);
177 win
= glutCreateWindow(*argv
);
184 glutReshapeFunc(Reshape
);
185 glutKeyboardFunc(Key
);
186 glutDisplayFunc(Draw
);