SDL_sysjoystick.c
资源名称:NETVIDEO.rar [点击查看]
上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:26k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
- 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
- slouken@libsdl.org
- */
- /* SDL joystick driver for Darwin / MacOS X, based on the IOKit HID API */
- /* Written 2001 by Max Horn */
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <ctype.h>
- #include <sys/errno.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
- /* The header was moved here in MacOS X 10.1 */
- #include <Kernel/IOKit/hidsystem/IOHIDUsageTables.h>
- #endif
- #include <IOKit/hid/IOHIDLib.h>
- #include <IOKit/hid/IOHIDKeys.h>
- #include <CoreFoundation/CoreFoundation.h>
- #include "SDL_error.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
- */
- /* 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
- {
- IOHIDDeviceInterface ** interface; // interface to device, NULL = no interface
- 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;
- struct joystick_hwdata* pNext; // next device
- };
- typedef struct joystick_hwdata recDevice;
- /* Linked list of all available devices */
- static recDevice *gpDeviceList = NULL;
- void HIDReportErrorNum (char * strError, long numError)
- {
- SDL_SetError(strError);
- }
- 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
- */
- 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;
- }
- /* similiar to HIDGetElementValue, but auto-calibrates the value before returning it */
- SInt32 HIDCalibratedValue (recDevice *pDevice, recElement *pElement)
- {
- float deviceScale = pElement->max - pElement->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) + pElement->min;
- }
- /* similiar to HIDCalibratedValue but calibrates to an arbitrary scale instead of the elements default scale */
- 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;
- }
- /* 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
- */
- 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 ("Couldn誸 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);
- }
- 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)
- */
- 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:
- 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 = NULL;
- io_iterator_t hidObjectIterator = NULL;
- CFMutableDictionaryRef hidMatchDictionary = NULL;
- recDevice *device, *lastDevice;
- io_object_t ioHIDDeviceObject = NULL;
- UInt32 usagePage = kHIDPage_GenericDesktop;
- UInt32 usage = kHIDUsage_GD_Joystick; /* We probably also should check for gamepads? */
- SDL_numjoysticks = 0;
- if (NULL != 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 != NULL) && (usagePage) && (usage))
- {
- /* Add key for device type (joystick, in this case) to refine the matching dictionary. */
- CFNumberRef refUsage = NULL, refUsagePage = NULL;
- refUsage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usagePage);
- CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsageKey), refUsage);
- refUsagePage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usage);
- 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) || (NULL == hidObjectIterator))
- {
- SDL_SetError("Joystick: Couldn't create a HID object iterator.");
- return -1;
- }
- /* 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);
- /* 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)
- {
- recDevice *device = gpDeviceList;
- 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;
- return 0;
- }
- /* 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;
- 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 != 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);
- switch(value)
- {
- case 0:
- pos = SDL_HAT_CENTERED;
- break;
- case 1:
- pos = SDL_HAT_UP;
- break;
- case 2:
- pos = SDL_HAT_RIGHTUP;
- break;
- case 3:
- pos = SDL_HAT_RIGHT;
- break;
- case 4:
- pos = SDL_HAT_RIGHTDOWN;
- break;
- case 5:
- pos = SDL_HAT_DOWN;
- break;
- case 6:
- pos = SDL_HAT_LEFTDOWN;
- break;
- case 7:
- pos = SDL_HAT_LEFT;
- break;
- case 8:
- pos = SDL_HAT_LEFTUP;
- 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);
- }