/*
* Open a controller for use - the index passed as an argument refers to
* the N'th controller on the system. This index is the value which will
* identify this controller in future controller events.
*
* This function returns a controller identifier, or NULL if an error occurred.
*/
SDL_GameController *
SDL_GameControllerOpen(int device_index)
{
SDL_GameController *gamecontroller;
SDL_GameController *gamecontrollerlist;
ControllerMapping_t *pSupportedController = NULL;
if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {
SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
return (NULL);
}
gamecontrollerlist = SDL_gamecontrollers;
/* If the controller is already open, return it */
while ( gamecontrollerlist )
{
if ( SDL_SYS_GetInstanceIdOfDeviceIndex(device_index) == gamecontrollerlist->joystick->instance_id ) {
gamecontroller = gamecontrollerlist;
++gamecontroller->ref_count;
return (gamecontroller);
}
gamecontrollerlist = gamecontrollerlist->next;
}
/* Find a controller mapping */
pSupportedController = SDL_PrivateGetControllerMapping(device_index);
if ( !pSupportedController ) {
SDL_SetError("Couldn't find mapping for device (%d)", device_index );
return (NULL);
}
/* Create and initialize the joystick */
gamecontroller = (SDL_GameController *) SDL_malloc((sizeof *gamecontroller));
if (gamecontroller == NULL) {
SDL_OutOfMemory();
return NULL;
}
SDL_memset(gamecontroller, 0, (sizeof *gamecontroller));
gamecontroller->joystick = SDL_JoystickOpen(device_index);
if ( !gamecontroller->joystick ) {
SDL_free(gamecontroller);
return NULL;
}
SDL_PrivateLoadButtonMapping( &gamecontroller->mapping, pSupportedController->guid, pSupportedController->name, pSupportedController->mapping );
/* Add joystick to list */
++gamecontroller->ref_count;
/* Link the joystick in the list */
gamecontroller->next = SDL_gamecontrollers;
SDL_gamecontrollers = gamecontroller;
SDL_SYS_JoystickUpdate( gamecontroller->joystick );
return (gamecontroller);
}
/*
* Get the implementation dependent name of a controller
*/
const char *
SDL_GameControllerNameForIndex(int device_index)
{
ControllerMapping_t *pSupportedController = SDL_PrivateGetControllerMapping(device_index);
if (pSupportedController) {
return pSupportedController->name;
}
return NULL;
}
/*
* Return 1 if the joystick at this device index is a supported controller
*/
SDL_bool
SDL_IsGameController(int device_index)
{
ControllerMapping_t *pSupportedController = SDL_PrivateGetControllerMapping(device_index);
if (pSupportedController) {
return SDL_TRUE;
}
return SDL_FALSE;
}
/*
* Open a controller for use - the index passed as an argument refers to
* the N'th controller on the system. This index is the value which will
* identify this controller in future controller events.
*
* This function returns a controller identifier, or NULL if an error occurred.
*/
SDL_GameController *
SDL_GameControllerOpen(int device_index)
{
SDL_GameController *gamecontroller;
SDL_GameController *gamecontrollerlist;
ControllerMapping_t *pSupportedController = NULL;
if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {
SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
return (NULL);
}
gamecontrollerlist = SDL_gamecontrollers;
/* If the controller is already open, return it */
while (gamecontrollerlist) {
if (SDL_SYS_GetInstanceIdOfDeviceIndex(device_index) == gamecontrollerlist->joystick->instance_id) {
gamecontroller = gamecontrollerlist;
++gamecontroller->ref_count;
return (gamecontroller);
}
gamecontrollerlist = gamecontrollerlist->next;
}
/* Find a controller mapping */
pSupportedController = SDL_PrivateGetControllerMapping(device_index);
if (!pSupportedController) {
SDL_SetError("Couldn't find mapping for device (%d)", device_index);
return (NULL);
}
/* Create and initialize the joystick */
gamecontroller = (SDL_GameController *) SDL_malloc((sizeof *gamecontroller));
if (gamecontroller == NULL) {
SDL_OutOfMemory();
return NULL;
}
SDL_memset(gamecontroller, 0, (sizeof *gamecontroller));
gamecontroller->joystick = SDL_JoystickOpen(device_index);
if (!gamecontroller->joystick) {
SDL_free(gamecontroller);
return NULL;
}
SDL_PrivateLoadButtonMapping(&gamecontroller->mapping, pSupportedController->guid, pSupportedController->name, pSupportedController->mapping);
/* The triggers are mapped from -32768 to 32767, where -32768 is the 'unpressed' value */
{
int leftTriggerMapping = gamecontroller->mapping.axes[SDL_CONTROLLER_AXIS_TRIGGERLEFT];
int rightTriggerMapping = gamecontroller->mapping.axes[SDL_CONTROLLER_AXIS_TRIGGERRIGHT];
if (leftTriggerMapping >= 0) {
gamecontroller->joystick->axes[leftTriggerMapping] =
gamecontroller->joystick->axes_zero[leftTriggerMapping] = (Sint16)-32768;
}
if (rightTriggerMapping >= 0) {
gamecontroller->joystick->axes[rightTriggerMapping] =
gamecontroller->joystick->axes_zero[rightTriggerMapping] = (Sint16)-32768;
}
}
/* Add joystick to list */
++gamecontroller->ref_count;
/* Link the joystick in the list */
gamecontroller->next = SDL_gamecontrollers;
SDL_gamecontrollers = gamecontroller;
SDL_SYS_JoystickUpdate(gamecontroller->joystick);
return (gamecontroller);
}
