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    glClearColor(1.0, 1.0, 1.0, 0.0);
45}
46
47static 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
58static void Key(unsigned char key, int x, int y)
59{
60
61    switch (key) {
62      case 27:
63	exit(1);
64      default:
65	break;
66    }
67
68    glutPostRedisplay();
69}
70
71static void Draw(void)
72{
73   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
74   glEnable(GL_DEPTH_TEST);
75
76   glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
77
78
79
80   glEnable(GL_POLYGON_OFFSET_FILL);
81   glPolygonOffset(1, 0);
82
83   glBegin(GL_QUADS);
84   glColor3f(1,0,0);
85   glVertex3f( 0.9, -0.9, -10.0);
86   glVertex3f( 0.9,  0.9, -10.0);
87   glVertex3f(-0.9,  0.9, -40.0);
88   glVertex3f(-0.9,  -0.9, -40.0);
89   glEnd();
90
91   glDisable(GL_POLYGON_OFFSET_FILL);
92
93   glBegin(GL_QUADS);
94   glColor3f(0,1,0);
95   glVertex3f( 0.6, -0.6, -15.0);
96   glVertex3f( 0.6,  0.6, -15.0);
97   glVertex3f(-0.6,  0.6, -35.0);
98   glVertex3f(-0.6,  -0.6, -35.0);
99   glEnd();
100
101   glEnable(GL_POLYGON_OFFSET_LINE);
102   glPolygonOffset(-1, 0);
103
104   glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
105
106   glBegin(GL_QUADS);
107   glColor3f(0,0,1);
108   glVertex3f( 0.3, -0.3, -20.0);
109   glVertex3f( 0.3,  0.3, -20.0);
110   glVertex3f(-0.3,  0.3, -30.0);
111   glVertex3f(-0.3,  -0.3, -30.0);
112   glEnd();
113
114
115   glDisable(GL_POLYGON_OFFSET_LINE);
116
117   glFlush();
118
119   if (doubleBuffer) {
120      glutSwapBuffers();
121   }
122}
123
124static GLenum Args(int argc, char **argv)
125{
126    GLint i;
127
128    doubleBuffer = GL_FALSE;
129
130    for (i = 1; i < argc; i++) {
131        if (strcmp(argv[i], "-sb") == 0) {
132	    doubleBuffer = GL_FALSE;
133	} else if (strcmp(argv[i], "-db") == 0) {
134	    doubleBuffer = GL_TRUE;
135	} else {
136	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
137	    return GL_FALSE;
138	}
139    }
140    return GL_TRUE;
141}
142
143int main(int argc, char **argv)
144{
145    GLenum type;
146
147    glutInit(&argc, argv);
148
149    if (Args(argc, argv) == GL_FALSE) {
150	exit(1);
151    }
152
153    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
154
155    type = GLUT_RGB | GLUT_ALPHA | GLUT_DEPTH;
156    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
157    glutInitDisplayMode(type);
158
159    if (glutCreateWindow(*argv) == GL_FALSE) {
160	exit(1);
161    }
162
163    Init();
164
165    glutReshapeFunc(Reshape);
166    glutKeyboardFunc(Key);
167    glutDisplayFunc(Draw);
168    glutMainLoop();
169	return 0;
170}
171