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 first_list, 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   /* First list will disrupt state which might potentially be
48    * short-circuited in calling list:
49    */
50   first_list = glGenLists(1);
51   glNewList(first_list, GL_COMPILE);
52   glShadeModel( GL_SMOOTH );
53   glEndList();
54
55
56   /* List that looks like it might have redundant state:
57    */
58   list = glGenLists(1);
59   glNewList(list, GL_COMPILE);
60
61   glBegin(GL_TRIANGLES);
62   glColor3f(0,0,.7);
63   glVertex3f( 0.9, -0.9, -30.0);
64   glColor3f(.8,0,0);
65   glVertex3f( 0.9,  0.9, -30.0);
66   glColor3f(0,.9,0);
67   glVertex3f(-0.9,  0.0, -30.0);
68   glEnd();
69
70   glShadeModel( GL_FLAT );
71   glBegin(GL_TRIANGLES);
72   glColor3f(0,0,.7);
73   glVertex3f( -0.9,  0.9, -30.0);
74   glColor3f(0,.9,0);
75   glVertex3f( -0.9, -0.9, -30.0);
76   glColor3f(.8,0,0);
77   glVertex3f(  0.9,  0.0, -30.0);
78   glEnd();
79
80   glCallList( first_list );
81
82   /* Do a quick begin/end to ensure we are not inside a dangling
83    * primitive from the called list:
84    */
85   glBegin( GL_POINTS );
86   glEnd();
87
88   /* This statechange is NOT redundant:
89    */
90   glShadeModel( GL_FLAT );
91   glBegin(GL_TRIANGLES);
92   glColor3f(1,0,0);
93   glVertex3f( -0.5,  0.5, -30.0);
94   glColor3f(0,1,0);
95   glVertex3f( -0.5, -0.5, -30.0);
96   glColor3f(0,0,1);
97   glVertex3f(  0.5,  0.0, -30.0);
98   glEnd();
99
100   glEndList();
101}
102
103static void Reshape(int width, int height)
104{
105
106    glViewport(0, 0, (GLint)width, (GLint)height);
107
108    glMatrixMode(GL_PROJECTION);
109    glLoadIdentity();
110    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
111    glMatrixMode(GL_MODELVIEW);
112}
113
114static void Key(unsigned char key, int x, int y)
115{
116
117    switch (key) {
118      case 27:
119	exit(1);
120      default:
121	break;
122    }
123
124    glutPostRedisplay();
125}
126
127
128
129
130static void Draw(void)
131{
132   glClear(GL_COLOR_BUFFER_BIT);
133
134   glShadeModel( GL_SMOOTH );
135   glCallList(list);
136
137   glFlush();
138
139   if (doubleBuffer) {
140      glutSwapBuffers();
141   }
142}
143
144static GLenum Args(int argc, char **argv)
145{
146    GLint i;
147
148    doubleBuffer = GL_FALSE;
149
150    for (i = 1; i < argc; i++) {
151        if (strcmp(argv[i], "-sb") == 0) {
152	    doubleBuffer = GL_FALSE;
153	} else if (strcmp(argv[i], "-db") == 0) {
154	    doubleBuffer = GL_TRUE;
155	} else {
156	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
157	    return GL_FALSE;
158	}
159    }
160    return GL_TRUE;
161}
162
163int main(int argc, char **argv)
164{
165    GLenum type;
166
167    glutInit(&argc, argv);
168
169    if (Args(argc, argv) == GL_FALSE) {
170	exit(1);
171    }
172
173    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
174
175    type = GLUT_RGB | GLUT_ALPHA;
176    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
177    glutInitDisplayMode(type);
178
179    if (glutCreateWindow(*argv) == GL_FALSE) {
180	exit(1);
181    }
182
183    Init();
184
185    glutReshapeFunc(Reshape);
186    glutKeyboardFunc(Key);
187    glutDisplayFunc(Draw);
188    glutMainLoop();
189	return 0;
190}
191