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 static GLenum doubleBuffer;
32 static GLfloat Xpos = 0, Ypos = 0;
33
34
Init(void)35 static 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
Reshape(int width,int height)44 static 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
Key(unsigned char key,int x,int y)53 static 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
64 static void
SpecialKey(int key,int x,int y)65 SpecialKey(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
Draw(void)87 static 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
Args(int argc,char ** argv)112 static 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
main(int argc,char ** argv)131 int 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