static bool gamepad_update_device_list(void) {
int cnt = SDL_NumJoysticks();
log_info("Updating gamepad devices list");
if(gamepad.num_devices > 0) {
assume(gamepad.devices != NULL);
for(uint i = 0; i < gamepad.num_devices; ++i) {
SDL_GameControllerClose(gamepad.devices[i].controller);
}
}
gamepad.num_devices = 0;
if(!cnt) {
free(gamepad.devices);
gamepad.devices = NULL;
gamepad.num_devices_allocated = 0;
log_info("No joysticks attached");
return false;
}
if(gamepad.num_devices_allocated != cnt) {
free(gamepad.devices);
gamepad.devices = calloc(cnt, sizeof(GamepadDevice));
gamepad.num_devices_allocated = cnt;
}
GamepadDevice *dev = gamepad.devices;
for(int i = 0; i < cnt; ++i) {
SDL_JoystickGUID guid = SDL_JoystickGetDeviceGUID(i);
char guid_str[33] = { 0 };
SDL_JoystickGetGUIDString(guid, guid_str, sizeof(guid_str));
if(!*guid_str) {
log_warn("Failed to read GUID of joystick at index %i: %s", i, SDL_GetError());
continue;
}
if(!SDL_IsGameController(i)) {
log_warn("Joystick at index %i (name: \"%s\"; guid: %s) is not recognized as a game controller by SDL. "
"Most likely it just doesn't have a mapping. See https://git.io/vdvdV for solutions",
i, SDL_JoystickNameForIndex(i), guid_str);
continue;
}
dev->sdl_id = i;
dev->controller = SDL_GameControllerOpen(i);
if(dev->controller == NULL) {
log_sdl_error(LOG_WARN, "SDL_GameControllerOpen");
continue;
}
dev->joy_instance = SDL_JoystickGetDeviceInstanceID(i);
if(dev->joy_instance < 0) {
log_sdl_error(LOG_WARN, "SDL_JoystickGetDeviceInstanceID");
continue;
}
log_info("Found device '%s' (#%i): %s", guid_str, DEVNUM(dev), gamepad_device_name_unmapped(i));
++gamepad.num_devices;
++dev;
}
if(!gamepad.num_devices) {
log_info("No usable devices");
return false;
}
return true;
}
/*
* Open a joystick for use - the index passed as an argument refers to
* the N'th joystick on the system. This index is the value which will
* identify this joystick in future joystick events.
*
* This function returns a joystick identifier, or NULL if an error occurred.
*/
SDL_Joystick *
SDL_JoystickOpen(int device_index)
{
SDL_Joystick *joystick;
SDL_Joystick *joysticklist;
const char *joystickname = NULL;
if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {
SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
return (NULL);
}
SDL_LockJoystickList();
joysticklist = SDL_joysticks;
/* If the joystick is already open, return it
* it is important that we have a single joystick * for each instance id
*/
while (joysticklist) {
if (SDL_JoystickGetDeviceInstanceID(device_index) == joysticklist->instance_id) {
joystick = joysticklist;
++joystick->ref_count;
SDL_UnlockJoystickList();
return (joystick);
}
joysticklist = joysticklist->next;
}
/* Create and initialize the joystick */
joystick = (SDL_Joystick *) SDL_calloc(sizeof(*joystick), 1);
if (joystick == NULL) {
SDL_OutOfMemory();
SDL_UnlockJoystickList();
return NULL;
}
if (SDL_SYS_JoystickOpen(joystick, device_index) < 0) {
SDL_free(joystick);
SDL_UnlockJoystickList();
return NULL;
}
joystickname = SDL_SYS_JoystickNameForDeviceIndex(device_index);
if (joystickname)
joystick->name = SDL_strdup(joystickname);
else
joystick->name = NULL;
if (joystick->naxes > 0) {
joystick->axes = (SDL_JoystickAxisInfo *) SDL_calloc(joystick->naxes, sizeof(SDL_JoystickAxisInfo));
}
if (joystick->nhats > 0) {
joystick->hats = (Uint8 *) SDL_calloc(joystick->nhats, sizeof(Uint8));
}
if (joystick->nballs > 0) {
joystick->balls = (struct balldelta *) SDL_calloc(joystick->nballs, sizeof(*joystick->balls));
}
if (joystick->nbuttons > 0) {
joystick->buttons = (Uint8 *) SDL_calloc(joystick->nbuttons, sizeof(Uint8));
}
if (((joystick->naxes > 0) && !joystick->axes)
|| ((joystick->nhats > 0) && !joystick->hats)
|| ((joystick->nballs > 0) && !joystick->balls)
|| ((joystick->nbuttons > 0) && !joystick->buttons)) {
SDL_OutOfMemory();
SDL_JoystickClose(joystick);
SDL_UnlockJoystickList();
return NULL;
}
joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
/* If this joystick is known to have all zero centered axes, skip the auto-centering code */
if (SDL_JoystickAxesCenteredAtZero(joystick)) {
int i;
for (i = 0; i < joystick->naxes; ++i) {
joystick->axes[i].has_initial_value = SDL_TRUE;
}
}
joystick->is_game_controller = SDL_IsGameController(device_index);
/* Add joystick to list */
++joystick->ref_count;
/* Link the joystick in the list */
joystick->next = SDL_joysticks;
SDL_joysticks = joystick;
SDL_UnlockJoystickList();
SDL_SYS_JoystickUpdate(joystick);
return (joystick);
}