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
31static GLenum doubleBuffer;
32static GLfloat Xpos = 0, Ypos = 0;
33
34
35static void Init(void)
36{
37   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
38   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
39   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
40   fflush(stderr);
41   glClearColor(0.0, 0.0, 1.0, 1.0);
42}
43
44static void Reshape(int width, int height)
45{
46    glViewport(0, 0, (GLint)width, (GLint)height);
47    glMatrixMode(GL_PROJECTION);
48    glLoadIdentity();
49    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
50    glMatrixMode(GL_MODELVIEW);
51}
52
53static void Key(unsigned char key, int x, int y)
54{
55    switch (key) {
56      case 27:
57	exit(1);
58      default:
59	break;
60    }
61    glutPostRedisplay();
62}
63
64static void
65SpecialKey(int key, int x, int y)
66{
67   const GLfloat step = 0.25;
68   (void) x;
69   (void) y;
70   switch (key) {
71      case GLUT_KEY_UP:
72         Ypos += step;
73         break;
74      case GLUT_KEY_DOWN:
75         Ypos -= step;
76         break;
77      case GLUT_KEY_LEFT:
78         Xpos -= step;
79         break;
80      case GLUT_KEY_RIGHT:
81         Xpos += step;
82         break;
83   }
84   glutPostRedisplay();
85}
86
87static void Draw(void)
88{
89   glClear(GL_COLOR_BUFFER_BIT);
90
91   glPushMatrix();
92   glTranslatef(Xpos, Ypos, 0);
93
94   glBegin(GL_TRIANGLES);
95   glColor3f(0,0,.7);
96   glVertex3f( 0.9, -0.9, -30.0);
97   glColor3f(.8,0,0);
98   glVertex3f( 0.9,  0.9, -30.0);
99   glColor3f(0,.9,0);
100   glVertex3f(-1.9,  0.0, -30.0);
101   glEnd();
102
103   glPopMatrix();
104
105   glFlush();
106
107   if (doubleBuffer) {
108      glutSwapBuffers();
109   }
110}
111
112static GLenum Args(int argc, char **argv)
113{
114    GLint i;
115
116    doubleBuffer = GL_FALSE;
117
118    for (i = 1; i < argc; i++) {
119        if (strcmp(argv[i], "-sb") == 0) {
120	    doubleBuffer = GL_FALSE;
121	} else if (strcmp(argv[i], "-db") == 0) {
122	    doubleBuffer = GL_TRUE;
123	} else {
124	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
125	    return GL_FALSE;
126	}
127    }
128    return GL_TRUE;
129}
130
131int main(int argc, char **argv)
132{
133    GLenum type;
134
135    glutInit(&argc, argv);
136
137    if (Args(argc, argv) == GL_FALSE) {
138	exit(1);
139    }
140
141    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
142
143    type = GLUT_RGB;
144    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
145    glutInitDisplayMode(type);
146
147    if (glutCreateWindow(*argv) == GL_FALSE) {
148	exit(1);
149    }
150
151    Init();
152
153    glutReshapeFunc(Reshape);
154    glutKeyboardFunc(Key);
155    glutSpecialFunc(SpecialKey);
156    glutDisplayFunc(Draw);
157    glutMainLoop();
158    return 0;
159}
160