1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/* $Id: winpos.c,v 1.3 2000/12/24 22:53:54 pesco Exp $ */
/*
* Example of how to use the GL_MESA_window_pos extension.
* Brian Paul This file is in the public domain.
*/
/*
* $Log: winpos.c,v $
* Revision 1.3 2000/12/24 22:53:54 pesco
* * demos/Makefile.am (INCLUDES): Added -I$(top_srcdir)/util.
* * demos/Makefile.X11, demos/Makefile.BeOS-R4, demos/Makefile.cygnus:
* Essentially the same.
* Program files updated to include "readtex.c", not "../util/readtex.c".
* * demos/reflect.c: Likewise for "showbuffer.c".
*
*
* * Makefile.am (EXTRA_DIST): Added top-level regular files.
*
* * include/GL/Makefile.am (INC_X11): Added glxext.h.
*
*
* * src/GGI/include/ggi/mesa/Makefile.am (EXTRA_HEADERS): Include
* Mesa GGI headers in dist even if HAVE_GGI is not given.
*
* * configure.in: Look for GLUT and demo source dirs in $srcdir.
*
* * src/swrast/Makefile.am (libMesaSwrast_la_SOURCES): Set to *.[ch].
* More source list updates in various Makefile.am's.
*
* * Makefile.am (dist-hook): Remove CVS directory from distribution.
* (DIST_SUBDIRS): List all possible subdirs here.
* (SUBDIRS): Only list subdirs selected for build again.
* The above two applied to all subdir Makefile.am's also.
*
* Revision 1.2 2000/06/27 17:04:43 brianp
* fixed compiler warnings
*
* Revision 1.1.1.1 1999/08/19 00:55:40 jtg
* Imported sources
*
* Revision 3.3 1999/03/28 18:24:37 brianp
* minor clean-up
*
* Revision 3.2 1998/11/05 04:34:04 brianp
* moved image files to ../images/ directory
*
* Revision 3.1 1998/02/22 16:36:10 brianp
* changed image file and set unpack alignment to 1
*
* Revision 3.0 1998/02/14 18:42:29 brianp
* initial rev
*
*/
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define GL_GLEXT_LEGACY
#include "GL/glut.h"
#include "readtex.c" /* a hack, I know */
#define IMAGE_FILE "../images/girl.rgb"
#ifndef M_PI
# define M_PI 3.14159265
#endif
static GLubyte *Image;
static int ImgWidth, ImgHeight;
static GLenum ImgFormat;
static void draw( void )
{
GLfloat angle;
char *extensions;
extensions = (char *) glGetString( GL_EXTENSIONS );
if (strstr( extensions, "GL_MESA_window_pos")==NULL) {
printf("Sorry, GL_MESA_window_pos extension not available.\n");
return;
}
glClear( GL_COLOR_BUFFER_BIT );
for (angle = -45.0; angle <= 135.0; angle += 10.0) {
GLfloat x = 50.0 + 200.0 * cos( angle * M_PI / 180.0 );
GLfloat y = 50.0 + 200.0 * sin( angle * M_PI / 180.0 );
/* Don't need to worry about the modelview or projection matrices!!! */
#ifdef GL_MESA_window_pos
glWindowPos2fMESA( x, y );
#endif
glDrawPixels( ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image );
}
}
static void key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case 27:
exit(0);
}
}
/* new window size or exposure */
static void reshape( int width, int height )
{
glViewport(0, 0, (GLint)width, (GLint)height);
}
static void init( void )
{
Image = LoadRGBImage( IMAGE_FILE, &ImgWidth, &ImgHeight, &ImgFormat );
if (!Image) {
printf("Couldn't read %s\n", IMAGE_FILE);
exit(0);
}
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
}
int main( int argc, char *argv[] )
{
glutInitWindowPosition(0, 0);
glutInitWindowSize(500, 500);
glutInitDisplayMode( GLUT_RGB );
if (glutCreateWindow("winpos") <= 0) {
exit(0);
}
init();
glutReshapeFunc( reshape );
glutKeyboardFunc( key );
glutDisplayFunc( draw );
glutMainLoop();
return 0;
}
|
