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
28 #define GL_GLEXT_PROTOTYPES
33 #define CI_OFFSET_1 16
34 #define CI_OFFSET_2 32
39 static void Init( void )
41 static const char *modulate2D
=
43 "SUB result.color, fragment.color.yzxw, fragment.color; \n"
48 if (!glutExtensionSupported("GL_ARB_fragment_program")) {
49 printf("Error: GL_ARB_fragment_program not supported!\n");
52 printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER
));
54 /* Setup the fragment program */
55 glGenProgramsARB(1, &modulateProg
);
56 glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB
, modulateProg
);
57 glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB
, GL_PROGRAM_FORMAT_ASCII_ARB
,
58 strlen(modulate2D
), (const GLubyte
*)modulate2D
);
60 printf("glGetError = 0x%x\n", (int) glGetError());
61 printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
62 (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB
));
64 glEnable(GL_FRAGMENT_PROGRAM_ARB
);
66 glClearColor(.3, .3, .3, 0);
69 static void Reshape(int width
, int height
)
72 glViewport(0, 0, (GLint
)width
, (GLint
)height
);
74 glMatrixMode(GL_PROJECTION
);
76 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
77 glMatrixMode(GL_MODELVIEW
);
80 static void Key(unsigned char key
, int x
, int y
)
93 static void Draw(void)
95 glClear(GL_COLOR_BUFFER_BIT
);
97 glBegin(GL_TRIANGLES
);
99 glVertex3f( 0.9, -0.9, -30.0);
101 glVertex3f( 0.9, 0.9, -30.0);
103 glVertex3f(-0.9, 0.0, -30.0);
113 static GLenum
Args(int argc
, char **argv
)
117 doubleBuffer
= GL_FALSE
;
119 for (i
= 1; i
< argc
; i
++) {
120 if (strcmp(argv
[i
], "-sb") == 0) {
121 doubleBuffer
= GL_FALSE
;
122 } else if (strcmp(argv
[i
], "-db") == 0) {
123 doubleBuffer
= GL_TRUE
;
125 fprintf(stderr
, "%s (Bad option).\n", argv
[i
]);
132 int main(int argc
, char **argv
)
136 glutInit(&argc
, argv
);
138 if (Args(argc
, argv
) == GL_FALSE
) {
142 glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
145 type
|= (doubleBuffer
) ? GLUT_DOUBLE
: GLUT_SINGLE
;
146 glutInitDisplayMode(type
);
148 if (glutCreateWindow("First Tri") == GL_FALSE
) {
154 glutReshapeFunc(Reshape
);
155 glutKeyboardFunc(Key
);
156 glutDisplayFunc(Draw
);