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
35GLenum doubleBuffer;
36
37static 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}
45
46static void Reshape(int width, int height)
47{
48
49    glViewport(0, 0, (GLint)width, (GLint)height);
50
51    glMatrixMode(GL_PROJECTION);
52    glLoadIdentity();
53    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
54    glMatrixMode(GL_MODELVIEW);
55}
56
57static void Key(unsigned char key, int x, int y)
58{
59
60    switch (key) {
61      case 27:
62	exit(0);
63      default:
64	break;
65    }
66
67    glutPostRedisplay();
68}
69
70static void Draw(void)
71{
72    glClearColor(
73       rand() / (float)RAND_MAX,
74       rand() / (float)RAND_MAX,
75       rand() / (float)RAND_MAX,
76       0.0);
77
78   glClear(GL_COLOR_BUFFER_BIT);
79   glFlush();
80
81   if (doubleBuffer) {
82      glutSwapBuffers();
83   }
84}
85
86static GLenum Args(int argc, char **argv)
87{
88    GLint i;
89
90    doubleBuffer = GL_FALSE;
91
92    for (i = 1; i < argc; i++) {
93        if (strcmp(argv[i], "-sb") == 0) {
94	    doubleBuffer = GL_FALSE;
95	} else if (strcmp(argv[i], "-db") == 0) {
96	    doubleBuffer = GL_TRUE;
97	} else {
98	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
99	    return GL_FALSE;
100	}
101    }
102    return GL_TRUE;
103}
104
105int main(int argc, char **argv)
106{
107    GLenum type;
108
109    glutInit(&argc, argv);
110
111    if (Args(argc, argv) == GL_FALSE) {
112	exit(1);
113    }
114
115    glutInitWindowPosition(0, 0);
116    glutInitWindowSize( 256, 256);
117
118    type = GLUT_RGB | GLUT_ALPHA;
119    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
120    glutInitDisplayMode(type);
121
122    if (glutCreateWindow(*argv) == GL_FALSE) {
123	exit(1);
124    }
125
126    Init();
127
128    glutReshapeFunc(Reshape);
129    glutKeyboardFunc(Key);
130    glutDisplayFunc(Draw);
131    glutMainLoop();
132    return 0;
133}
134