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 static GLenum doubleBuffer;
31 static GLenum frontface = GL_CCW;
32
Init(void)33 static void Init(void)
34 {
35 fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
36 fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
37 fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
38 fflush(stderr);
39 }
40
Reshape(int width,int height)41 static void Reshape(int width, int height)
42 {
43 glViewport(0, 0, (GLint)width, (GLint)height);
44
45 glMatrixMode(GL_PROJECTION);
46 glLoadIdentity();
47 /* glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
48 glMatrixMode(GL_MODELVIEW);
49 }
50
Key(unsigned char key,int x,int y)51 static void Key(unsigned char key, int x, int y)
52 {
53 switch (key) {
54 case 'f':
55 frontface = (frontface == GL_CCW) ? GL_CW : GL_CCW;
56 glFrontFace(frontface);
57 break;
58 case 27:
59 exit(1);
60 default:
61 return;
62 }
63
64 glutPostRedisplay();
65 }
66
Draw(void)67 static void Draw(void)
68 {
69 glClear(GL_COLOR_BUFFER_BIT);
70 glPolygonMode(GL_FRONT, GL_LINE);
71 glPolygonMode(GL_BACK, GL_POINT);
72
73 glBegin(GL_TRIANGLES);
74 glEdgeFlag(1);
75 glColor3f(0.3,0.3,.9);
76 glVertex3f( 0.9, -0.9, -0.0);
77 glEdgeFlag(0);
78 glColor3f(.8,0,0);
79 glVertex3f( 0.9, 0.9, -0.0);
80 glEdgeFlag(1);
81 glColor3f(0,.9,0);
82 glVertex3f(-0.9, 0.0, -0.0);
83 glEnd();
84
85 glFlush();
86
87 if (doubleBuffer) {
88 glutSwapBuffers();
89 }
90 }
91
Args(int argc,char ** argv)92 static GLenum Args(int argc, char **argv)
93 {
94 GLint i;
95
96 doubleBuffer = GL_FALSE;
97
98 for (i = 1; i < argc; i++) {
99 if (strcmp(argv[i], "-sb") == 0) {
100 doubleBuffer = GL_FALSE;
101 } else if (strcmp(argv[i], "-db") == 0) {
102 doubleBuffer = GL_TRUE;
103 } else {
104 fprintf(stderr, "%s (Bad option).\n", argv[i]);
105 return GL_FALSE;
106 }
107 }
108 return GL_TRUE;
109 }
110
main(int argc,char ** argv)111 int main(int argc, char **argv)
112 {
113 GLenum type;
114
115 glutInit(&argc, argv);
116
117 if (Args(argc, argv) == GL_FALSE) {
118 exit(1);
119 }
120
121 glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
122
123 type = GLUT_RGB | GLUT_ALPHA;
124 type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
125 glutInitDisplayMode(type);
126
127 if (glutCreateWindow(*argv) == GL_FALSE) {
128 exit(1);
129 }
130
131 Init();
132
133 glutReshapeFunc(Reshape);
134 glutKeyboardFunc(Key);
135 glutDisplayFunc(Draw);
136 glutMainLoop();
137 return 0;
138 }
139