tri-unfilled-fog.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
30
31#define CI_OFFSET_1 16
32#define CI_OFFSET_2 32
33
34GLint Width = 250, Height = 250;
35
36GLenum doubleBuffer;
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
48static void Reshape(int width, int height)
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   switch (key) {
61      case 27:
62         exit(1);
63   }
64
65   glutPostRedisplay();
66}
67
68static void Draw(void)
69{
70   glClear(GL_COLOR_BUFFER_BIT);
71
72   glEnable(GL_FOG);
73
74   glPolygonMode(GL_FRONT, GL_FILL);
75   glPolygonMode(GL_BACK, GL_FILL);
76
77   glBegin(GL_TRIANGLES);
78   glColor3f(0,0,.7);
79   glVertex3f( 0.7, -0.7, -30.0);
80   glColor3f(.8,0,0);
81   glVertex3f( 0.7,  0.7, -30.0);
82   glColor3f(0,.9,0);
83   glVertex3f(-0.7,  0.0, -30.0);
84   glEnd();
85
86   glPolygonMode(GL_FRONT, GL_LINE);
87   glPolygonMode(GL_BACK, GL_LINE);
88
89   glBegin(GL_TRIANGLES);
90   glColor3f(0,0,.7);
91   glVertex3f( 0.9, -0.9, -30.0);
92   glColor3f(.8,0,0);
93   glVertex3f( 0.9,  0.9, -30.0);
94   glColor3f(0,.9,0);
95   glVertex3f(-0.9,  0.0, -30.0);
96   glEnd();
97
98   glDisable(GL_FOG);
99
100   glFlush();
101
102   if (doubleBuffer) {
103      glutSwapBuffers();
104   }
105}
106
107static GLenum Args(int argc, char **argv)
108{
109   GLint i;
110
111   doubleBuffer = GL_FALSE;
112
113   for (i = 1; i < argc; i++) {
114      if (strcmp(argv[i], "-sb") == 0) {
115         doubleBuffer = GL_FALSE;
116      } else if (strcmp(argv[i], "-db") == 0) {
117         doubleBuffer = GL_TRUE;
118      } else {
119         fprintf(stderr, "%s (Bad option).\n", argv[i]);
120         return GL_FALSE;
121      }
122   }
123   return GL_TRUE;
124}
125
126int main(int argc, char **argv)
127{
128   GLenum type;
129
130   glutInit(&argc, argv);
131
132   if (Args(argc, argv) == GL_FALSE) {
133      exit(1);
134   }
135
136   glutInitWindowPosition(100, 0); glutInitWindowSize(Width, Height);
137
138   type = GLUT_RGB;
139   type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
140   glutInitDisplayMode(type);
141
142   if (glutCreateWindow(*argv) == GL_FALSE) {
143      exit(1);
144   }
145
146   Init();
147
148   glutReshapeFunc(Reshape);
149   glutKeyboardFunc(Key);
150   glutDisplayFunc(Draw);
151   glutMainLoop();
152   return 0;
153}
154