tri-edgeflag.c revision 32001f49 
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
30static GLenum doubleBuffer;
31static GLenum frontface = GL_CCW;
32
33static 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
41static 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
51static 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
67static 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
92static 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
111int 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