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   static GLdouble plane[4] = { -.5, 0, 1, 0 };
40
41   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
42   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
43   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
44   fflush(stderr);
45
46   glClearColor(0.0, 0.0, 1.0, 0.0);
47   glClipPlane(GL_CLIP_PLANE0, plane);
48   glEnable(GL_CLIP_PLANE0);
49   glLineWidth( 4 );
50}
51
52static void Reshape(int width, int height)
53{
54
55    glViewport(0, 0, (GLint)width, (GLint)height);
56
57    glMatrixMode(GL_PROJECTION);
58    glLoadIdentity();
59/*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
60    glMatrixMode(GL_MODELVIEW);
61}
62
63static void Key(unsigned char key, int x, int y)
64{
65
66    switch (key) {
67      case 27:
68	exit(1);
69      default:
70	break;
71    }
72
73    glutPostRedisplay();
74}
75
76static void Draw(void)
77{
78   glClear(GL_COLOR_BUFFER_BIT);
79   glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
80
81   glEnable(GL_LINE_STIPPLE);
82   glLineStipple( 5, 0xfffe );
83
84
85
86   glBegin(GL_TRIANGLES);
87   glColor3f(0,0,.7);
88   glVertex3f( 0.9, -0.9, 0.0);
89   glColor3f(.8,0,0);
90   glVertex3f( 0.9,  0.9, 0.0);
91   glColor3f(0,.9,0);
92   glVertex3f(-0.9,  0.0, 0.0);
93   glEnd();
94
95   glFlush();
96
97   if (doubleBuffer) {
98      glutSwapBuffers();
99   }
100}
101
102static GLenum Args(int argc, char **argv)
103{
104    GLint i;
105
106    doubleBuffer = GL_FALSE;
107
108    for (i = 1; i < argc; i++) {
109        if (strcmp(argv[i], "-sb") == 0) {
110	    doubleBuffer = GL_FALSE;
111	} else if (strcmp(argv[i], "-db") == 0) {
112	    doubleBuffer = GL_TRUE;
113	} else {
114	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
115	    return GL_FALSE;
116	}
117    }
118    return GL_TRUE;
119}
120
121int main(int argc, char **argv)
122{
123    GLenum type;
124
125    glutInit(&argc, argv);
126
127    if (Args(argc, argv) == GL_FALSE) {
128	exit(1);
129    }
130
131    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
132
133    type = GLUT_RGB;
134    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
135    glutInitDisplayMode(type);
136
137    if (glutCreateWindow(*argv) == GL_FALSE) {
138	exit(1);
139    }
140
141    Init();
142
143    glutReshapeFunc(Reshape);
144    glutKeyboardFunc(Key);
145    glutDisplayFunc(Draw);
146    glutMainLoop();
147	return 0;
148}
149