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
25 #define GL_GLEXT_PROTOTYPES
33 #define CI_OFFSET_1 16
34 #define CI_OFFSET_2 32
38 static GLuint DrawPBO
;
40 static void Init(void)
42 fprintf(stderr
, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER
));
43 fprintf(stderr
, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION
));
44 fprintf(stderr
, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR
));
46 glClearColor(0.0, 0.0, 1.0, 0.0);
50 GLubyte tex2d
[SIZE
][SIZE
][4];
53 for (s
= 0; s
< SIZE
; s
++) {
54 for (t
= 0; t
< SIZE
; t
++) {
57 tex2d
[t
][s
][0] = 0x30;
58 tex2d
[t
][s
][1] = t
*255/(SIZE
-1);
59 tex2d
[t
][s
][2] = s
*255/(SIZE
-1);
60 tex2d
[t
][s
][3] = 0xff;
65 /* put image into DrawPBO */
66 glGenBuffersARB(1, &DrawPBO
);
67 glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT
, DrawPBO
);
68 glBufferDataARB(GL_PIXEL_PACK_BUFFER_EXT
,
69 SIZE
* SIZE
* 4, tex2d
, GL_STATIC_DRAW
);
70 glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT
, 0);
73 glTexEnvf(GL_TEXTURE_ENV
, GL_TEXTURE_ENV_MODE
, GL_REPLACE
);
74 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_WRAP_R
, GL_REPEAT
);
75 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MIN_FILTER
, GL_NEAREST
);
76 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MAG_FILTER
, GL_NEAREST
);
78 glPixelStorei(GL_UNPACK_ALIGNMENT
, 1);
79 glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT
, DrawPBO
);
80 glTexImage2D(GL_TEXTURE_2D
, 0, GL_RGBA
, SIZE
, SIZE
, 0,
81 GL_BGRA
, GL_UNSIGNED_BYTE
, NULL
);
82 glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT
, 0);
83 glPixelStorei(GL_UNPACK_ALIGNMENT
, 4);
84 glEnable(GL_TEXTURE_2D
);
89 static void Reshape(int width
, int height
)
92 glViewport(0, 0, (GLint
)width
, (GLint
)height
);
94 glMatrixMode(GL_PROJECTION
);
96 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
97 glMatrixMode(GL_MODELVIEW
);
100 static void Key(unsigned char key
, int x
, int y
)
113 static void Draw(void)
115 glClear(GL_COLOR_BUFFER_BIT
);
119 glVertex3f( 0.9, -0.9, -30.0);
121 glVertex3f( 0.9, 0.9, -30.0);
123 glVertex3f(-0.9, 0.9, -30.0);
125 glVertex3f(-0.9, -0.9, -30.0);
135 static GLenum
Args(int argc
, char **argv
)
139 doubleBuffer
= GL_FALSE
;
141 for (i
= 1; i
< argc
; i
++) {
142 if (strcmp(argv
[i
], "-sb") == 0) {
143 doubleBuffer
= GL_FALSE
;
144 } else if (strcmp(argv
[i
], "-db") == 0) {
145 doubleBuffer
= GL_TRUE
;
147 fprintf(stderr
, "%s (Bad option).\n", argv
[i
]);
154 int main(int argc
, char **argv
)
158 glutInit(&argc
, argv
);
160 if (Args(argc
, argv
) == GL_FALSE
) {
164 glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
167 type
|= (doubleBuffer
) ? GLUT_DOUBLE
: GLUT_SINGLE
;
168 glutInitDisplayMode(type
);
170 if (glutCreateWindow("First Tri") == GL_FALSE
) {
176 glutReshapeFunc(Reshape
);
177 glutKeyboardFunc(Key
);
178 glutDisplayFunc(Draw
);