quadstrip-clip.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
30GLenum doubleBuffer;
31
32static void Init(void)
33{
34   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
35   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
36   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
37   fflush(stderr);
38
39   glClearColor(0.0, 0.0, 1.0, 0.0);
40}
41
42static void Reshape(int width, int height)
43{
44   glViewport(0, 0, (GLint)width, (GLint)height);
45
46   glMatrixMode(GL_PROJECTION);
47   glLoadIdentity();
48   glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
49   glMatrixMode(GL_MODELVIEW);
50}
51
52static void Key(unsigned char key, int x, int y)
53{
54
55   switch (key) {
56      case 27:
57         exit(1);
58   }
59
60   glutPostRedisplay();
61}
62
63static void Draw(void)
64{
65   glClear(GL_COLOR_BUFFER_BIT);
66
67   glBegin(GL_QUAD_STRIP);
68   glColor3f(1,1,1);
69   glVertex3f( 1.9, -0.9, -30.0);
70   glVertex3f( 0.9, 0.9, -30.0);
71
72   glColor3f(1,0,0);
73   glVertex3f( 0.1, -0.8, -30.0);
74   glVertex3f( 0.1, 0.8, -30.0);
75
76   glColor3f(0,1,0);
77   glVertex3f(-0.1,  -0.9, -30.0);
78   glVertex3f(-0.1,  0.9, -30.0);
79
80   glColor3f(0,0,0);
81   glVertex3f(-0.9,  -0.8, -30.0);
82   glVertex3f(-0.9,  0.8, -30.0);
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