1 /*
2 * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
3 *
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.
11 *
12 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
13 * ANY KIND,
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16 *
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
22 * OF THIS SOFTWARE.
23 */
24
25 #include <stdio.h>
26 #include <string.h>
27 #include <stdlib.h>
28 #include "glut_wrap.h"
29
30
31 #define CI_OFFSET_1 16
32 #define CI_OFFSET_2 32
33
34
35 GLenum doubleBuffer;
36
Init(void)37 static void Init(void)
38 {
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));
42 fflush(stderr);
43
44 glClearColor(0.0, 0.0, 1.0, 0.0);
45 }
46
Reshape(int width,int height)47 static void Reshape(int width, int height)
48 {
49
50 glViewport(0, 0, (GLint)width, (GLint)height);
51
52 glMatrixMode(GL_PROJECTION);
53 glLoadIdentity();
54 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
55 glMatrixMode(GL_MODELVIEW);
56 }
57
Key(unsigned char key,int x,int y)58 static void Key(unsigned char key, int x, int y)
59 {
60
61 switch (key) {
62 case 27:
63 exit(0);
64 default:
65 break;
66 }
67
68 glutPostRedisplay();
69 }
70
Draw(void)71 static void Draw(void)
72 {
73 glClear(GL_COLOR_BUFFER_BIT);
74 glFlush();
75
76 if (doubleBuffer) {
77 glutSwapBuffers();
78 }
79 }
80
Args(int argc,char ** argv)81 static GLenum Args(int argc, char **argv)
82 {
83 GLint i;
84
85 doubleBuffer = GL_FALSE;
86
87 for (i = 1; i < argc; i++) {
88 if (strcmp(argv[i], "-sb") == 0) {
89 doubleBuffer = GL_FALSE;
90 } else if (strcmp(argv[i], "-db") == 0) {
91 doubleBuffer = GL_TRUE;
92 } else {
93 fprintf(stderr, "%s (Bad option).\n", argv[i]);
94 return GL_FALSE;
95 }
96 }
97 return GL_TRUE;
98 }
99
main(int argc,char ** argv)100 int main(int argc, char **argv)
101 {
102 GLenum type;
103
104 glutInit(&argc, argv);
105
106 if (Args(argc, argv) == GL_FALSE) {
107 exit(1);
108 }
109
110 glutInitWindowPosition(0, 0);
111 glutInitWindowSize( 256, 256);
112
113 type = GLUT_RGB | GLUT_ALPHA;
114 type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
115 glutInitDisplayMode(type);
116
117 if (glutCreateWindow(*argv) == GL_FALSE) {
118 exit(1);
119 }
120
121 Init();
122
123 glutReshapeFunc(Reshape);
124 glutKeyboardFunc(Key);
125 glutDisplayFunc(Draw);
126 glutMainLoop();
127 return 0;
128 }
129