tri-userclip.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
34
35GLenum doubleBuffer;
36
37static void Init(void)
38{
39   static GLdouble plane[4] = { -.5, 0, 1, 0 };
40
41   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
42   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
43   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
44   fflush(stderr);
45
46   glClearColor(0.0, 0.0, 1.0, 0.0);
47   glClipPlane(GL_CLIP_PLANE0, plane);
48   glEnable(GL_CLIP_PLANE0);
49}
50
51static void Reshape(int width, int height)
52{
53
54    glViewport(0, 0, (GLint)width, (GLint)height);
55
56    glMatrixMode(GL_PROJECTION);
57    glLoadIdentity();
58/*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
59    glMatrixMode(GL_MODELVIEW);
60}
61
62static void Key(unsigned char key, int x, int y)
63{
64
65    switch (key) {
66      case 27:
67	exit(1);
68      default:
69	break;
70    }
71
72    glutPostRedisplay();
73}
74
75static void Draw(void)
76{
77   glClear(GL_COLOR_BUFFER_BIT);
78
79   glBegin(GL_TRIANGLES);
80   glColor3f(0,0,.7);
81   glVertex3f( 0.9, -0.9, 0.0);
82   glColor3f(.8,0,0);
83   glVertex3f( 0.9,  0.9, 0.0);
84   glColor3f(0,.9,0);
85   glVertex3f(-0.9,  0.0, 0.0);
86   glEnd();
87
88   glFlush();
89
90   if (doubleBuffer) {
91      glutSwapBuffers();
92   }
93}
94
95static GLenum Args(int argc, char **argv)
96{
97    GLint i;
98
99    doubleBuffer = GL_FALSE;
100
101    for (i = 1; i < argc; i++) {
102        if (strcmp(argv[i], "-sb") == 0) {
103	    doubleBuffer = GL_FALSE;
104	} else if (strcmp(argv[i], "-db") == 0) {
105	    doubleBuffer = GL_TRUE;
106	} else {
107	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
108	    return GL_FALSE;
109	}
110    }
111    return GL_TRUE;
112}
113
114int main(int argc, char **argv)
115{
116    GLenum type;
117
118    glutInit(&argc, argv);
119
120    if (Args(argc, argv) == GL_FALSE) {
121	exit(1);
122    }
123
124    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
125
126    type = GLUT_RGB | GLUT_ALPHA;
127    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
128    glutInitDisplayMode(type);
129
130    if (glutCreateWindow(*argv) == GL_FALSE) {
131	exit(1);
132    }
133
134    Init();
135
136    glutReshapeFunc(Reshape);
137    glutKeyboardFunc(Key);
138    glutDisplayFunc(Draw);
139    glutMainLoop();
140	return 0;
141}
142