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
30GLenum doubleBuffer;
31
32static void Init(void)
33{
34   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
35   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
36   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
37   fflush(stderr);
38
39    glClearColor(0.0, 0.0, 1.0, 0.0);
40}
41
42static void Reshape(int width, int height)
43{
44
45    glViewport(0, 0, (GLint)width, (GLint)height);
46
47    glMatrixMode(GL_PROJECTION);
48    glLoadIdentity();
49    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
50    glMatrixMode(GL_MODELVIEW);
51}
52
53static void Key(unsigned char key, int x, int y)
54{
55
56    switch (key) {
57      case 27:
58	exit(1);
59      default:
60	break;
61    }
62
63    glutPostRedisplay();
64}
65
66static void Draw(void)
67{
68   glClear(GL_COLOR_BUFFER_BIT);
69
70   glBegin(GL_QUAD_STRIP);
71   glColor3f(1,0,0);
72   glVertex3f( 0.9, -0.9, -30.0);
73   glColor3f(1,1,0);
74   glVertex3f( 0.9,  0.9, -30.0);
75
76   glColor3f(1,0,0);
77   glVertex3f( 0.1, -0.8, -30.0);
78   glColor3f(1,1,0);
79   glVertex3f( 0.1,  0.8, -30.0);
80
81   glColor3f(0,1,1);
82   glVertex3f(-0.1,  -0.9, -30.0);
83   glColor3f(1,0,1);
84   glVertex3f(-0.1,  0.9, -30.0);
85
86   glColor3f(0,1,1);
87   glVertex3f(-0.9,  -0.8, -30.0);
88   glColor3f(1,0,1);
89   glVertex3f(-0.9,  0.8, -30.0);
90   glEnd();
91
92   glFlush();
93
94   if (doubleBuffer) {
95      glutSwapBuffers();
96   }
97}
98
99static void
100idle(void)
101{
102  glutPostRedisplay();
103}
104
105
106static void
107visible(int vis)
108{
109  if (vis == GLUT_VISIBLE)
110    glutIdleFunc(idle);
111  else
112    glutIdleFunc(NULL);
113}
114
115
116static GLenum Args(int argc, char **argv)
117{
118    GLint i;
119
120    doubleBuffer = GL_FALSE;
121
122    for (i = 1; i < argc; i++) {
123        if (strcmp(argv[i], "-sb") == 0) {
124	    doubleBuffer = GL_FALSE;
125	} else if (strcmp(argv[i], "-db") == 0) {
126	    doubleBuffer = GL_TRUE;
127	} else {
128	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
129	    return GL_FALSE;
130	}
131    }
132    return GL_TRUE;
133}
134
135int main(int argc, char **argv)
136{
137    GLenum type;
138
139    glutInit(&argc, argv);
140
141    if (Args(argc, argv) == GL_FALSE) {
142	exit(1);
143    }
144
145    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
146
147    type = GLUT_RGB;
148    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
149    glutInitDisplayMode(type);
150
151    if (glutCreateWindow(*argv) == GL_FALSE) {
152	exit(1);
153    }
154
155    Init();
156
157    glutReshapeFunc(Reshape);
158    glutKeyboardFunc(Key);
159    glutDisplayFunc(Draw);
160    glutVisibilityFunc(visible);
161    glutMainLoop();
162	return 0;
163}
164