Interesting, I don’t think glut or freeglut ever had glutInitJoystick – it is not in my glut headers on ubuntu. A quick google search lead to a one off modified glut to include this at glutjoy. Maybe centOS used this rogue glut library? I am not familar with CentOS but have used Ubuntu+freeglut. A look at the header file for freeglut_std.h shows a “glutJoystickFunc” callback but note on X11 is discouraging. In other words I think GLUT is not so good for joystick controls.
As a low-level API, if you want to use the joystick in linux you could do something low level as
//
// g++ joystick.cpp
//
//http://archives.seul.org/linuxgames/Aug-1999/msg00107.html
/* this is the linux 2.2.x way of handling joysticks. It allows an arbitrary
* number of axis and buttons. It's event driven, and has full signed int
* ranges of the axis (-32768 to 32767). It also lets you pull the joysticks
* name. The only place this works of that I know of is in the linux 1.x
* joystick driver, which is included in the linux 2.2.x kernels
*/
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/joystick.h>
#define JOY_DEV "/dev/input/js0"
int main()
{
int joy_fd, *axis=NULL, num_of_axis=0, num_of_buttons=0, x;
char *button=NULL, name_of_joystick[80];
struct js_event js;
if( ( joy_fd = open( JOY_DEV , O_RDONLY)) == -1 )
{
printf( "Couldn't open joystick
" );
return -1;
}
ioctl( joy_fd, JSIOCGAXES, &num_of_axis );
ioctl( joy_fd, JSIOCGBUTTONS, &num_of_buttons );
ioctl( joy_fd, JSIOCGNAME(80), &name_of_joystick );
axis = (int *) calloc( num_of_axis, sizeof( int ) );
button = (char *) calloc( num_of_buttons, sizeof( char ) );
printf("Joystick detected: %s
%d axis
%d buttons
"
, name_of_joystick
, num_of_axis
, num_of_buttons );
fcntl( joy_fd, F_SETFL, O_NONBLOCK ); /* use non-blocking mode */
while( 1 ) /* infinite loop */
{
/* read the joystick state */
read(joy_fd, &js, sizeof(struct js_event));
/* see what to do with the event */
switch (js.type & ~JS_EVENT_INIT)
{
case JS_EVENT_AXIS:
axis [ js.number ] = js.value;
break;
case JS_EVENT_BUTTON:
button [ js.number ] = js.value;
break;
}
/* print the results */
printf( "X: %6d Y: %6d ", axis[0], axis[1] );
if( num_of_axis > 2 )
printf("Z: %6d ", axis[2] );
if( num_of_axis > 3 )
printf("R: %6d ", axis[3] );
for( x=0 ; x<num_of_buttons ; ++x )
printf("B%d: %d ", x, button[x] );
printf(" \r");
fflush(stdout);
}
close( joy_fd ); /* too bad we never get here */
return 0;
}
And note that freeglut_ext.h says
/*
* Joystick functions, see freeglut_joystick.c
*/
/* USE OF THESE FUNCTIONS IS DEPRECATED !!!!! */
/* If you have a serious need for these functions in your application, please either
* contact the "freeglut" developer community at [email]freeglut-developer@lists.sourceforge.net[/email],
* switch to the OpenGLUT library, or else port your joystick functionality over to PLIB's
* "js" library.
*/