/*

SDL - Simple DirectMedia Layer

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with this library; if not, write to the Free

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

#ifdef SDL_JOYSTICK_IOKIT

/* Written 2001 by Max Horn */

#include <unistd.h>

#include <ctype.h>

#include <sysexits.h>

#include <mach/mach.h>

#include <mach/mach_error.h>

#include <IOKit/IOKitLib.h>

#include <IOKit/IOCFPlugIn.h>

#ifdef MACOS_10_0_4

#include <IOKit/hidsystem/IOHIDUsageTables.h>

#else

#include <IOKit/hid/IOHIDLib.h>

#include <IOKit/hid/IOHIDKeys.h>

#include <CoreFoundation/CoreFoundation.h>

#include "SDL_joystick.h"

#include "../SDL_sysjoystick.h"

#include "../SDL_joystick_c.h"

struct recElement

{

IOHIDElementCookie cookie; /* unique value which identifies element, will NOT change */

long min; /* reported min value possible */

long max; /* reported max value possible */

/* TODO: maybe should handle the following stuff somehow? */

long scaledMin; /* reported scaled min value possible */

long scaledMax; /* reported scaled max value possible */

long size; /* size in bits of data return from element */

Boolean relative; /* are reports relative to last report (deltas) */

Boolean wrapping; /* does element wrap around (one value higher than max is min) */

Boolean nonLinear; /* are the values reported non-linear relative to element movement */

Boolean preferredState; /* does element have a preferred state (such as a button) */

Boolean nullState; /* does element have null state */

#endif /* 0 */

/* runtime variables used for auto-calibration */

long minReport; /* min returned value */

long maxReport; /* max returned value */

struct recElement *pNext; /* next element in list */

};

typedef struct recElement recElement;

struct joystick_hwdata

{

char product[256]; /* name of product */

long usage; /* usage page from IOUSBHID Parser.h which defines general usage */

long usagePage; /* usage within above page from IOUSBHID Parser.h which defines specific usage */

long axes; /* number of axis (calculated, not reported by device) */

long buttons; /* number of buttons (calculated, not reported by device) */

long hats; /* number of hat switches (calculated, not reported by device) */

long elements; /* number of total elements (shouldbe total of above) (calculated, not reported by device) */

recElement *firstAxis;

recElement *firstButton;

recElement *firstHat;

int removed;

int uncentered;

};

typedef struct joystick_hwdata recDevice;

/* Linked list of all available devices */

static recDevice *gpDeviceList = NULL;

static void

HIDReportErrorNum(char *strError, long numError)

}

static void HIDGetCollectionElements(CFMutableDictionaryRef deviceProperties,

recDevice * pDevice);

/* returns current value for element, polling element

* will return 0 on error conditions which should be accounted for by application

*/

static SInt32

HIDGetElementValue(recDevice * pDevice, recElement * pElement)

IOReturn result = kIOReturnSuccess;

IOHIDEventStruct hidEvent;

hidEvent.value = 0;

if (NULL != pDevice && NULL != pElement && NULL != pDevice->interface) {

result =

(*(pDevice->interface))->getElementValue(pDevice->interface,

pElement->cookie,

&hidEvent);

if (kIOReturnSuccess == result) {

/* record min and max for auto calibration */

if (hidEvent.value < pElement->minReport)

pElement->minReport = hidEvent.value;

if (hidEvent.value > pElement->maxReport)

pElement->maxReport = hidEvent.value;

}

}

/* auto user scale */

return hidEvent.value;

}

static SInt32

HIDScaledCalibratedValue(recDevice * pDevice, recElement * pElement,

long min, long max)

float deviceScale = max - min;

float readScale = pElement->maxReport - pElement->minReport;

SInt32 value = HIDGetElementValue(pDevice, pElement);

if (readScale == 0)

return value; /* no scaling at all */

else

return ((value - pElement->minReport) * deviceScale / readScale) +

min;

}

static void

HIDRemovalCallback(void *target, IOReturn result, void *refcon, void *sender)

recDevice *device = (recDevice *) refcon;

device->removed = 1;

device->uncentered = 1;

}

/* Create and open an interface to device, required prior to extracting values or building queues.

* Note: appliction now owns the device and must close and release it prior to exiting

*/

static IOReturn

HIDCreateOpenDeviceInterface(io_object_t hidDevice, recDevice * pDevice)

IOReturn result = kIOReturnSuccess;

HRESULT plugInResult = S_OK;

SInt32 score = 0;

IOCFPlugInInterface **ppPlugInInterface = NULL;

if (NULL == pDevice->interface) {

result =

IOCreatePlugInInterfaceForService(hidDevice,

kIOHIDDeviceUserClientTypeID,

kIOCFPlugInInterfaceID,

&ppPlugInInterface, &score);

if (kIOReturnSuccess == result) {

/* Call a method of the intermediate plug-in to create the device interface */

plugInResult =

(*ppPlugInInterface)->QueryInterface(ppPlugInInterface,

CFUUIDGetUUIDBytes

(kIOHIDDeviceInterfaceID),

(void *) &(pDevice->

interface));

if (S_OK != plugInResult)

HIDReportErrorNum

("CouldnÕt query HID class device interface from plugInInterface",

plugInResult);

(*ppPlugInInterface)->Release(ppPlugInInterface);

} else

HIDReportErrorNum

("Failed to create **plugInInterface via IOCreatePlugInInterfaceForService.",

result);

}

if (NULL != pDevice->interface) {

result = (*(pDevice->interface))->open(pDevice->interface, 0);

if (kIOReturnSuccess != result)

HIDReportErrorNum

("Failed to open pDevice->interface via open.", result);

else

(*(pDevice->interface))->setRemovalCallback(pDevice->interface,

HIDRemovalCallback,

pDevice, pDevice);

}

return result;

}

/* Closes and releases interface to device, should be done prior to exting application

* Note: will have no affect if device or interface do not exist

* application will "own" the device if interface is not closed

* (device may have to be plug and re-plugged in different location to get it working again without a restart)

*/

static IOReturn

HIDCloseReleaseInterface(recDevice * pDevice)

IOReturn result = kIOReturnSuccess;

if ((NULL != pDevice) && (NULL != pDevice->interface)) {

/* close the interface */

result = (*(pDevice->interface))->close(pDevice->interface);

if (kIOReturnNotOpen == result) {

/* do nothing as device was not opened, thus can't be closed */

} else if (kIOReturnSuccess != result)

HIDReportErrorNum("Failed to close IOHIDDeviceInterface.",

result);

/* release the interface */

result = (*(pDevice->interface))->Release(pDevice->interface);

if (kIOReturnSuccess != result)

HIDReportErrorNum("Failed to release IOHIDDeviceInterface.",

result);

pDevice->interface = NULL;

}

return result;

}

/* extracts actual specific element information from each element CF dictionary entry */

static void

HIDGetElementInfo(CFTypeRef refElement, recElement * pElement)

long number;

CFTypeRef refType;

refType = CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementCookieKey));

if (refType && CFNumberGetValue(refType, kCFNumberLongType, &number))

pElement->cookie = (IOHIDElementCookie) number;

refType = CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementMinKey));

if (refType && CFNumberGetValue(refType, kCFNumberLongType, &number))

pElement->min = number;

pElement->maxReport = pElement->min;

refType = CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementMaxKey));

if (refType && CFNumberGetValue(refType, kCFNumberLongType, &number))

pElement->max = number;

pElement->minReport = pElement->max;

/*

TODO: maybe should handle the following stuff somehow?

refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMinKey));

if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))

pElement->scaledMin = number;

refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMaxKey));

if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))

pElement->scaledMax = number;

refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementSizeKey));

if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))

pElement->size = number;

refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsRelativeKey));

if (refType)

pElement->relative = CFBooleanGetValue (refType);

refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsWrappingKey));

if (refType)

pElement->wrapping = CFBooleanGetValue (refType);

refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsNonLinearKey));

if (refType)

pElement->nonLinear = CFBooleanGetValue (refType);

refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasPreferedStateKey));

if (refType)

pElement->preferredState = CFBooleanGetValue (refType);

refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasNullStateKey));

if (refType)

pElement->nullState = CFBooleanGetValue (refType);

*/

/* examines CF dictionary vlaue in device element hierarchy to determine if it is element of interest or a collection of more elements

* if element of interest allocate storage, add to list and retrieve element specific info

* if collection then pass on to deconstruction collection into additional individual elements

*/

static void

HIDAddElement(CFTypeRef refElement, recDevice * pDevice)

recElement *element = NULL;

recElement **headElement = NULL;

long elementType, usagePage, usage;

CFTypeRef refElementType =

CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementTypeKey));

CFTypeRef refUsagePage =

CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementUsagePageKey));

CFTypeRef refUsage =

CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementUsageKey));

if ((refElementType)

&&

(CFNumberGetValue(refElementType, kCFNumberLongType, &elementType))) {

/* look at types of interest */

if ((elementType == kIOHIDElementTypeInput_Misc)

|| (elementType == kIOHIDElementTypeInput_Button)

|| (elementType == kIOHIDElementTypeInput_Axis)) {

if (refUsagePage

&& CFNumberGetValue(refUsagePage, kCFNumberLongType,

&usagePage) && refUsage

&& CFNumberGetValue(refUsage, kCFNumberLongType, &usage)) {

switch (usagePage) { /* only interested in kHIDPage_GenericDesktop and kHIDPage_Button */

case kHIDPage_GenericDesktop:

{

switch (usage) { /* look at usage to determine function */

case kHIDUsage_GD_X:

case kHIDUsage_GD_Y:

case kHIDUsage_GD_Z:

case kHIDUsage_GD_Rx:

case kHIDUsage_GD_Ry:

case kHIDUsage_GD_Rz:

case kHIDUsage_GD_Slider:

case kHIDUsage_GD_Dial:

case kHIDUsage_GD_Wheel:

element = (recElement *)

NewPtrClear(sizeof(recElement));

if (element) {

pDevice->axes++;

headElement = &(pDevice->firstAxis);

}

break;

case kHIDUsage_GD_Hatswitch:

element = (recElement *)

NewPtrClear(sizeof(recElement));

if (element) {

pDevice->hats++;

headElement = &(pDevice->firstHat);

}

break;

}

}

break;

case kHIDPage_Button:

element = (recElement *)

NewPtrClear(sizeof(recElement));

if (element) {

pDevice->buttons++;

headElement = &(pDevice->firstButton);

}

break;

default:

break;

}

}

} else if (kIOHIDElementTypeCollection == elementType)

HIDGetCollectionElements((CFMutableDictionaryRef) refElement,

pDevice);

}

if (element && headElement) { /* add to list */

pDevice->elements++;

if (NULL == *headElement)

*headElement = element;

else {

recElement *elementPrevious, *elementCurrent;

elementCurrent = *headElement;

while (elementCurrent) {

elementPrevious = elementCurrent;

elementCurrent = elementPrevious->pNext;

}

elementPrevious->pNext = element;

}

element->pNext = NULL;

HIDGetElementInfo(refElement, element);

}

}

/* collects information from each array member in device element list (each array memeber = element) */

static void

HIDGetElementsCFArrayHandler(const void *value, void *parameter)

if (CFGetTypeID(value) == CFDictionaryGetTypeID())

HIDAddElement((CFTypeRef) value, (recDevice *) parameter);

}

/* handles retrieval of element information from arrays of elements in device IO registry information */

static void

HIDGetElements(CFTypeRef refElementCurrent, recDevice * pDevice)

CFTypeID type = CFGetTypeID(refElementCurrent);

if (type == CFArrayGetTypeID()) { /* if element is an array */

CFRange range = { 0, CFArrayGetCount(refElementCurrent) };

/* CountElementsCFArrayHandler called for each array member */

CFArrayApplyFunction(refElementCurrent, range,

HIDGetElementsCFArrayHandler, pDevice);

}

}

/* handles extracting element information from element collection CF types

* used from top level element decoding and hierarchy deconstruction to flatten device element list

*/

static void

HIDGetCollectionElements(CFMutableDictionaryRef deviceProperties,

recDevice * pDevice)

CFTypeRef refElementTop =

CFDictionaryGetValue(deviceProperties, CFSTR(kIOHIDElementKey));

if (refElementTop)

HIDGetElements(refElementTop, pDevice);

}

/* use top level element usage page and usage to discern device usage page and usage setting appropriate vlaues in device record */

static void

HIDTopLevelElementHandler(const void *value, void *parameter)

CFTypeRef refCF = 0;

if (CFGetTypeID(value) != CFDictionaryGetTypeID())

return;

refCF = CFDictionaryGetValue(value, CFSTR(kIOHIDElementUsagePageKey));

if (!CFNumberGetValue

(refCF, kCFNumberLongType, &((recDevice *) parameter)->usagePage))

SDL_SetError("CFNumberGetValue error retrieving pDevice->usagePage.");

refCF = CFDictionaryGetValue(value, CFSTR(kIOHIDElementUsageKey));

if (!CFNumberGetValue

(refCF, kCFNumberLongType, &((recDevice *) parameter)->usage))

SDL_SetError("CFNumberGetValue error retrieving pDevice->usage.");

}

/* extracts device info from CF dictionary records in IO registry */

static void

HIDGetDeviceInfo(io_object_t hidDevice, CFMutableDictionaryRef hidProperties,

recDevice * pDevice)

CFMutableDictionaryRef usbProperties = 0;

io_registry_entry_t parent1, parent2;

/* Mac OS X currently is not mirroring all USB properties to HID page so need to look at USB device page also

* get dictionary for usb properties: step up two levels and get CF dictionary for USB properties

*/

if ((KERN_SUCCESS ==

IORegistryEntryGetParentEntry(hidDevice, kIOServicePlane, &parent1))

&& (KERN_SUCCESS ==

IORegistryEntryGetParentEntry(parent1, kIOServicePlane, &parent2))

&& (KERN_SUCCESS ==

IORegistryEntryCreateCFProperties(parent2, &usbProperties,

kCFAllocatorDefault,

kNilOptions))) {

if (usbProperties) {

CFTypeRef refCF = 0;

/* get device info

* try hid dictionary first, if fail then go to usb dictionary

*/

/* get product name */

refCF =

CFDictionaryGetValue(hidProperties, CFSTR(kIOHIDProductKey));

if (!refCF)

refCF =

CFDictionaryGetValue(usbProperties,

CFSTR("USB Product Name"));

if (refCF) {

if (!CFStringGetCString

(refCF, pDevice->product, 256,

CFStringGetSystemEncoding()))

SDL_SetError

("CFStringGetCString error retrieving pDevice->product.");

}

/* get usage page and usage */

refCF =

CFDictionaryGetValue(hidProperties,

CFSTR(kIOHIDPrimaryUsagePageKey));

if (refCF) {

if (!CFNumberGetValue

(refCF, kCFNumberLongType, &pDevice->usagePage))

SDL_SetError

("CFNumberGetValue error retrieving pDevice->usagePage.");

refCF =

CFDictionaryGetValue(hidProperties,

CFSTR(kIOHIDPrimaryUsageKey));

if (refCF)

if (!CFNumberGetValue

(refCF, kCFNumberLongType, &pDevice->usage))

SDL_SetError

("CFNumberGetValue error retrieving pDevice->usage.");

}

if (NULL == refCF) { /* get top level element HID usage page or usage */

/* use top level element instead */

CFTypeRef refCFTopElement = 0;

refCFTopElement =

CFDictionaryGetValue(hidProperties,

CFSTR(kIOHIDElementKey));

{

/* refCFTopElement points to an array of element dictionaries */

CFRange range = { 0, CFArrayGetCount(refCFTopElement) };

CFArrayApplyFunction(refCFTopElement, range,

HIDTopLevelElementHandler, pDevice);

}

}

CFRelease(usbProperties);

} else

SDL_SetError

("IORegistryEntryCreateCFProperties failed to create usbProperties.");

if (kIOReturnSuccess != IOObjectRelease(parent2))

SDL_SetError("IOObjectRelease error with parent2.");

if (kIOReturnSuccess != IOObjectRelease(parent1))

SDL_SetError("IOObjectRelease error with parent1.");

}

}

static recDevice *

HIDBuildDevice(io_object_t hidDevice)

recDevice *pDevice = (recDevice *) NewPtrClear(sizeof(recDevice));

if (pDevice) {

/* get dictionary for HID properties */

CFMutableDictionaryRef hidProperties = 0;

kern_return_t result =

IORegistryEntryCreateCFProperties(hidDevice, &hidProperties,

kCFAllocatorDefault,

kNilOptions);

if ((result == KERN_SUCCESS) && hidProperties) {

/* create device interface */

result = HIDCreateOpenDeviceInterface(hidDevice, pDevice);

if (kIOReturnSuccess == result) {

HIDGetDeviceInfo(hidDevice, hidProperties, pDevice); /* hidDevice used to find parents in registry tree */

HIDGetCollectionElements(hidProperties, pDevice);

} else {

DisposePtr((Ptr) pDevice);

pDevice = NULL;

}

CFRelease(hidProperties);

} else {

DisposePtr((Ptr) pDevice);

pDevice = NULL;

}

}

return pDevice;

}

/* disposes of the element list associated with a device and the memory associated with the list

*/

static void

HIDDisposeElementList(recElement ** elementList)

recElement *pElement = *elementList;

while (pElement) {

recElement *pElementNext = pElement->pNext;

DisposePtr((Ptr) pElement);

pElement = pElementNext;

}

*elementList = NULL;

}

/* disposes of a single device, closing and releaseing interface, freeing memory fro device and elements, setting device pointer to NULL

* all your device no longer belong to us... (i.e., you do not 'own' the device anymore)

*/

static recDevice *

HIDDisposeDevice(recDevice ** ppDevice)

kern_return_t result = KERN_SUCCESS;

recDevice *pDeviceNext = NULL;

if (*ppDevice) {

/* save next device prior to disposing of this device */

pDeviceNext = (*ppDevice)->pNext;

/* free element lists */

HIDDisposeElementList(&(*ppDevice)->firstAxis);

HIDDisposeElementList(&(*ppDevice)->firstButton);

HIDDisposeElementList(&(*ppDevice)->firstHat);

result = HIDCloseReleaseInterface(*ppDevice); /* function sanity checks interface value (now application does not own device) */

if (kIOReturnSuccess != result)

HIDReportErrorNum

("HIDCloseReleaseInterface failed when trying to dipose device.",

result);

DisposePtr((Ptr) * ppDevice);

*ppDevice = NULL;

}

return pDeviceNext;

}

/* Function to scan the system for joysticks.

* Joystick 0 should be the system default joystick.

* This function should return the number of available joysticks, or -1

* on an unrecoverable fatal error.

*/

int

SDL_SYS_JoystickInit(void)

IOReturn result = kIOReturnSuccess;

mach_port_t masterPort = 0;

io_iterator_t hidObjectIterator = 0;

CFMutableDictionaryRef hidMatchDictionary = NULL;

recDevice *device, *lastDevice;

io_object_t ioHIDDeviceObject = 0;

SDL_numjoysticks = 0;

if (gpDeviceList) {

SDL_SetError("Joystick: Device list already inited.");

return -1;

}

result = IOMasterPort(bootstrap_port, &masterPort);

if (kIOReturnSuccess != result) {

SDL_SetError("Joystick: IOMasterPort error with bootstrap_port.");

return -1;

}

/* Set up a matching dictionary to search I/O Registry by class name for all HID class devices. */

hidMatchDictionary = IOServiceMatching(kIOHIDDeviceKey);

if (hidMatchDictionary) {

/* Add key for device type (joystick, in this case) to refine the matching dictionary. */

/* NOTE: we now perform this filtering later

UInt32 usagePage = kHIDPage_GenericDesktop;

UInt32 usage = kHIDUsage_GD_Joystick;

CFNumberRef refUsage = NULL, refUsagePage = NULL;

refUsage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usage);

CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsageKey), refUsage);

refUsagePage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usagePage);

CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsagePageKey), refUsagePage);

*/

} else {

SDL_SetError

("Joystick: Failed to get HID CFMutableDictionaryRef via IOServiceMatching.");

return -1;

}

/*/ Now search I/O Registry for matching devices. */

result =

IOServiceGetMatchingServices(masterPort, hidMatchDictionary,

&hidObjectIterator);

/* Check for errors */

if (kIOReturnSuccess != result) {

SDL_SetError("Joystick: Couldn't create a HID object iterator.");

return -1;

}

if (!hidObjectIterator) { /* there are no joysticks */

gpDeviceList = NULL;

SDL_numjoysticks = 0;

return 0;

}

/* IOServiceGetMatchingServices consumes a reference to the dictionary, so we don't need to release the dictionary ref. */

/* build flat linked list of devices from device iterator */

gpDeviceList = lastDevice = NULL;

while ((ioHIDDeviceObject = IOIteratorNext(hidObjectIterator))) {

/* build a device record */

device = HIDBuildDevice(ioHIDDeviceObject);

if (!device)

continue;

/* dump device object, it is no longer needed */

result = IOObjectRelease(ioHIDDeviceObject);

/* if (KERN_SUCCESS != result)

HIDReportErrorNum ("IOObjectRelease error with ioHIDDeviceObject.", result);

*/

if ( (device->usagePage != kHIDPage_GenericDesktop) ||

((device->usage != kHIDUsage_GD_Joystick &&

device->usage != kHIDUsage_GD_GamePad &&

device->usage != kHIDUsage_GD_MultiAxisController)) ) {

/* release memory for the device */

HIDDisposeDevice(&device);

DisposePtr((Ptr) device);

continue;

}

/* Add device to the end of the list */

if (lastDevice)

lastDevice->pNext = device;

else

gpDeviceList = device;

lastDevice = device;

}

result = IOObjectRelease(hidObjectIterator); /* release the iterator */

/* Count the total number of devices we found */

device = gpDeviceList;

while (device) {

SDL_numjoysticks++;

device = device->pNext;

}

return SDL_numjoysticks;

}

/* Function to get the device-dependent name of a joystick */

const char *

SDL_SYS_JoystickName(int index)

for (; index > 0; index--)

device = device->pNext;

return device->product;

}

/* 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)

recDevice *device = gpDeviceList;

int index;

for (index = joystick->index; index > 0; index--)

device = device->pNext;

joystick->hwdata = device;

joystick->name = device->product;

joystick->naxes = device->axes;

joystick->nhats = device->hats;

joystick->nballs = 0;

joystick->nbuttons = device->buttons;

}

/* Function to update the state of a joystick - called as a device poll.

* This function shouldn't update the joystick structure directly,

* but instead should call SDL_PrivateJoystick*() to deliver events

* and update joystick device state.

*/

void

SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)

recDevice *device = joystick->hwdata;

recElement *element;

SInt32 value;

int i;

if (device->removed) { /* device was unplugged; ignore it. */

if (device->uncentered) {

device->uncentered = 0;

/* Tell the app that everything is centered/unpressed... */

for (i = 0; i < device->axes; i++)

SDL_PrivateJoystickAxis(joystick, i, 0);

for (i = 0; i < device->buttons; i++)

SDL_PrivateJoystickButton(joystick, i, 0);

for (i = 0; i < device->hats; i++)

SDL_PrivateJoystickHat(joystick, i, SDL_HAT_CENTERED);

}

return;

}

element = device->firstAxis;

i = 0;

while (element) {

value = HIDScaledCalibratedValue(device, element, -32768, 32767);

if (value != joystick->axes[i])

SDL_PrivateJoystickAxis(joystick, i, value);

element = element->pNext;

++i;

}

element = device->firstButton;

i = 0;

while (element) {

value = HIDGetElementValue(device, element);

if (value > 1) /* handle pressure-sensitive buttons */

if (value != joystick->buttons[i])

SDL_PrivateJoystickButton(joystick, i, value);

element = element->pNext;

++i;

}

element = device->firstHat;

i = 0;

while (element) {

Uint8 pos = 0;

value = HIDGetElementValue(device, element);

if (element->max == 3) /* 4 position hatswitch - scale up value */

value *= 2;

else if (element->max != 7) /* Neither a 4 nor 8 positions - fall back to default position (centered) */

value = -1;

switch (value) {

case 0:

pos = SDL_HAT_UP;

break;

case 1:

pos = SDL_HAT_RIGHTUP;

break;

case 2:

pos = SDL_HAT_RIGHT;

break;

case 3:

pos = SDL_HAT_RIGHTDOWN;

break;

case 4:

pos = SDL_HAT_DOWN;

break;

case 5:

pos = SDL_HAT_LEFTDOWN;

break;

case 6:

pos = SDL_HAT_LEFT;

break;

case 7:

pos = SDL_HAT_LEFTUP;

break;

default:

/* Every other value is mapped to center. We do that because some

* joysticks use 8 and some 15 for this value, and apparently

* there are even more variants out there - so we try to be generous.

*/

pos = SDL_HAT_CENTERED;

break;

}

if (pos != joystick->hats[i])

SDL_PrivateJoystickHat(joystick, i, pos);

element = element->pNext;

++i;

}

return;

}

/* Function to close a joystick after use */

void

SDL_SYS_JoystickClose(SDL_Joystick * joystick)

/* Should we do anything here? */

return;

}

/* Function to perform any system-specific joystick related cleanup */

void

SDL_SYS_JoystickQuit(void)

while (NULL != gpDeviceList)

gpDeviceList = HIDDisposeDevice(&gpDeviceList);

#endif /* SDL_JOYSTICK_IOKIT */