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;
36GLint list;
37
38static void Init(void)
39{
40   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
41   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
42   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
43   fflush(stderr);
44
45   glClearColor(0.0, 0.0, 1.0, 0.0);
46
47   list = glGenLists(1);
48   glNewList(list, GL_COMPILE);
49
50   /* XXX: this state-change will only be executed if list is called
51    * from outside a begin/end pair:
52    */
53   glShadeModel( GL_FLAT );
54   glBegin(GL_TRIANGLES);
55   glColor3f(0,0,.7);
56   glVertex3f( -0.9,  0.9, -30.0);
57   glColor3f(0,.9,0);
58   glVertex3f( -0.9, -0.9, -30.0);
59   glColor3f(.8,0,0);
60   glVertex3f(  0.9,  0.0, -30.0);
61   glEnd();
62
63   /* This statechange is potentially NOT redundant:
64    */
65   glShadeModel( GL_FLAT );
66   glBegin(GL_TRIANGLES);
67   glColor3f(0,1,0);
68   glVertex3f( -0.5,  0.5, -30.0);
69   glColor3f(0,0,1);
70   glVertex3f( -0.5, -0.5, -30.0);
71   glColor3f(1,0,0);
72   glVertex3f(  0.5,  0.0, -30.0);
73   glEnd();
74
75   glEndList();
76}
77
78static void Reshape(int width, int height)
79{
80
81    glViewport(0, 0, (GLint)width, (GLint)height);
82
83    glMatrixMode(GL_PROJECTION);
84    glLoadIdentity();
85    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
86    glMatrixMode(GL_MODELVIEW);
87}
88
89static void Key(unsigned char key, int x, int y)
90{
91
92    switch (key) {
93      case 27:
94	exit(1);
95      default:
96	break;
97    }
98
99    glutPostRedisplay();
100}
101
102
103
104
105static void Draw(void)
106{
107   glClear(GL_COLOR_BUFFER_BIT);
108
109   glShadeModel( GL_SMOOTH );
110
111   glBegin(GL_TRIANGLES);
112
113   /* Note: call the list from inside a begin/end pair.  The end is
114    * provided by the display list...
115    */
116   glCallList(list);
117
118   glFlush();
119
120   if (doubleBuffer) {
121      glutSwapBuffers();
122   }
123}
124
125static GLenum Args(int argc, char **argv)
126{
127    GLint i;
128
129    doubleBuffer = GL_FALSE;
130
131    for (i = 1; i < argc; i++) {
132        if (strcmp(argv[i], "-sb") == 0) {
133	    doubleBuffer = GL_FALSE;
134	} else if (strcmp(argv[i], "-db") == 0) {
135	    doubleBuffer = GL_TRUE;
136	} else {
137	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
138	    return GL_FALSE;
139	}
140    }
141    return GL_TRUE;
142}
143
144int main(int argc, char **argv)
145{
146    GLenum type;
147
148    glutInit(&argc, argv);
149
150    if (Args(argc, argv) == GL_FALSE) {
151	exit(1);
152    }
153
154    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
155
156    type = GLUT_RGB | GLUT_ALPHA;
157    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
158    glutInitDisplayMode(type);
159
160    if (glutCreateWindow(*argv) == GL_FALSE) {
161	exit(1);
162    }
163
164    Init();
165
166    glutReshapeFunc(Reshape);
167    glutKeyboardFunc(Key);
168    glutDisplayFunc(Draw);
169    glutMainLoop();
170	return 0;
171}
172