/* Function to open a joystick for use.
The joystick to open is specified by the device index.
This should fill the nbuttons and naxes fields of the joystick structure.
It returns 0, or -1 if there is an error.
*/
int
SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
{
SDL_joylist_item *item = JoystickByDevIndex(device_index);
if (item == NULL) {
return SDL_SetError("No such device");
}
joystick->instance_id = item->device_instance;
joystick->hwdata = (struct joystick_hwdata *)
SDL_calloc(1, sizeof(*joystick->hwdata));
if (joystick->hwdata == NULL) {
return SDL_OutOfMemory();
}
joystick->hwdata->item = item;
joystick->hwdata->guid = item->guid;
joystick->hwdata->m_bSteamController = item->m_bSteamController;
if (item->m_bSteamController) {
joystick->hwdata->fd = -1;
SDL_GetSteamControllerInputs(&joystick->nbuttons,
&joystick->naxes,
&joystick->nhats);
} else {
int fd = open(item->path, O_RDONLY, 0);
if (fd < 0) {
SDL_free(joystick->hwdata);
joystick->hwdata = NULL;
return SDL_SetError("Unable to open %s", item->path);
}
joystick->hwdata->fd = fd;
joystick->hwdata->fname = SDL_strdup(item->path);
if (joystick->hwdata->fname == NULL) {
SDL_free(joystick->hwdata);
joystick->hwdata = NULL;
close(fd);
return SDL_OutOfMemory();
}
/* Set the joystick to non-blocking read mode */
fcntl(fd, F_SETFL, O_NONBLOCK);
/* Get the number of buttons and axes on the joystick */
ConfigJoystick(joystick, fd);
}
SDL_assert(item->hwdata == NULL);
item->hwdata = joystick->hwdata;
/* mark joystick as fresh and ready */
joystick->hwdata->fresh = 1;
return (0);
}
/* Function to open a joystick for use.
The joystick to open is specified by the index field of the joystick.
This should fill the nbuttons and naxes fields of the joystick structure.
It returns 0, or -1 if there is an error.
*/
int
SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
{
SDL_joylist_item *item = JoystickByDevIndex(device_index);
char *fname = NULL;
int fd = -1;
if (item == NULL) {
SDL_SetError("No such device");
return -1;
}
fname = item->path;
fd = open(fname, O_RDONLY, 0);
if (fd < 0) {
SDL_SetError("Unable to open %s", fname);
return -1;
}
joystick->instance_id = item->device_instance;
joystick->hwdata = (struct joystick_hwdata *)
SDL_malloc(sizeof(*joystick->hwdata));
if (joystick->hwdata == NULL) {
close(fd);
SDL_OutOfMemory();
return (-1);
}
SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
joystick->hwdata->item = item;
joystick->hwdata->guid = item->guid;
joystick->hwdata->fd = fd;
joystick->hwdata->fname = SDL_strdup(item->path);
if (joystick->hwdata->fname == NULL) {
SDL_free(joystick->hwdata);
joystick->hwdata = NULL;
close(fd);
SDL_OutOfMemory();
return (-1);
}
SDL_assert(item->hwdata == NULL);
item->hwdata = joystick->hwdata;
/* Set the joystick to non-blocking read mode */
fcntl(fd, F_SETFL, O_NONBLOCK);
/* Get the number of buttons and axes on the joystick */
ConfigJoystick(joystick, fd);
// mark joystick as fresh and ready
joystick->hwdata->fresh = 1;
return (0);
}
/* Function to open a joystick for use.
The joystick to open is specified by the device index.
This should fill the nbuttons and naxes fields of the joystick structure.
It returns 0, or -1 if there is an error.
*/
int
SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
{
SDL_joylist_item *item = JoystickByDevIndex(device_index);
if (item == NULL ) {
return SDL_SetError("No such device");
}
if (item->joystick != NULL) {
return SDL_SetError("Joystick already opened");
}
joystick->instance_id = item->device_instance;
joystick->hwdata = (struct joystick_hwdata *) item;
item->joystick = joystick;
joystick->nhats = item->nhats;
joystick->nballs = item->nballs;
joystick->nbuttons = item->nbuttons;
joystick->naxes = item->naxes;
return (0);
}
/* Function to perform the mapping from device index to the instance id for this index */
SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
{
return JoystickByDevIndex(device_index)->device_instance;
}
/* Function to get the device-dependent name of a joystick */
const char *
SDL_SYS_JoystickNameForDeviceIndex(int device_index)
{
return JoystickByDevIndex(device_index)->name;
}
SDL_JoystickGUID SDL_SYS_JoystickGetDeviceGUID( int device_index )
{
return JoystickByDevIndex(device_index)->guid;
}