--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/haptic/darwin/SDL_syshaptic.c	Mon Aug 25 09:55:03 2008 +0000
@@ -0,0 +1,1317 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 2008 Edgar Simo
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#ifdef SDL_HAPTIC_IOKIT
+
+#include "SDL_haptic.h"
+#include "../SDL_syshaptic.h"
+#include "SDL_joystick.h"
+#include "../../joystick/SDL_sysjoystick.h"     /* For the real SDL_Joystick */
+#include "../../joystick/darwin/SDL_sysjoystick_c.h"    /* For joystick hwdata */
+
+#include <IOKit/IOKitLib.h>
+#include <IOKit/hid/IOHIDKeys.h>
+#include <ForceFeedback/ForceFeedback.h>
+#include <ForceFeedback/ForceFeedbackConstants.h>
+
+
+#define MAX_HAPTICS  32
+
+
+/*
+ * List of available haptic devices.
+ */
+static struct
+{
+    char name[256];             /* Name of the device. */
+
+    io_service_t dev;           /* Node we use to create the device. */
+    SDL_Haptic *haptic;         /* Haptic currently assosciated with it. */
+
+    /* Usage pages for determining if it's a mouse or not. */
+    long usage;
+    long usagePage;
+} SDL_hapticlist[MAX_HAPTICS];
+
+
+/*
+ * Haptic system hardware data.
+ */
+struct haptic_hwdata
+{
+    FFDeviceObjectReference device;     /* Hardware device. */
+    UInt8 axes[3];
+};
+
+
+/*
+ * Haptic system effect data.
+ */
+struct haptic_hweffect
+{
+    FFEffectObjectReference ref;        /* Reference. */
+    struct FFEFFECT effect;     /* Hardware effect. */
+};
+
+/*
+ * Prototypes.
+ */
+static void SDL_SYS_HapticFreeFFEFFECT(FFEFFECT * effect, int type);
+static int HIDGetDeviceProduct(io_service_t dev, char *name);
+
+
+/* 
+ * Like strerror but for force feedback errors.
+ */
+static const char *
+FFStrError(HRESULT err)
+{
+    switch (err) {
+    case FFERR_DEVICEFULL:
+        return "device full";
+        /* This should be valid, but for some reason isn't defined... */
+        /*case FFERR_DEVICENOTREG:
+           return "device not registered"; */
+    case FFERR_DEVICEPAUSED:
+        return "device paused";
+    case FFERR_DEVICERELEASED:
+        return "device released";
+    case FFERR_EFFECTPLAYING:
+        return "effect playing";
+    case FFERR_EFFECTTYPEMISMATCH:
+        return "effect type mismatch";
+    case FFERR_EFFECTTYPENOTSUPPORTED:
+        return "effect type not supported";
+    case FFERR_GENERIC:
+        return "undetermined error";
+    case FFERR_HASEFFECTS:
+        return "device has effects";
+    case FFERR_INCOMPLETEEFFECT:
+        return "incomplete effect";
+    case FFERR_INTERNAL:
+        return "internal fault";
+    case FFERR_INVALIDDOWNLOADID:
+        return "invalid download id";
+    case FFERR_INVALIDPARAM:
+        return "invalid parameter";
+    case FFERR_MOREDATA:
+        return "more data";
+    case FFERR_NOINTERFACE:
+        return "interface not supported";
+    case FFERR_NOTDOWNLOADED:
+        return "effect is not downloaded";
+    case FFERR_NOTINITIALIZED:
+        return "object has not been initialized";
+    case FFERR_OUTOFMEMORY:
+        return "out of memory";
+    case FFERR_UNPLUGGED:
+        return "device is unplugged";
+    case FFERR_UNSUPPORTED:
+        return "function call unsupported";
+    case FFERR_UNSUPPORTEDAXIS:
+        return "axis unsupported";
+
+    default:
+        return "unknown error";
+    }
+}
+
+
+/*
+ * Initializes the haptic subsystem.
+ */
+int
+SDL_SYS_HapticInit(void)
+{
+    int numhaptics;
+    IOReturn result;
+    io_iterator_t iter;
+    CFDictionaryRef match;
+    io_service_t device;
+    CFMutableDictionaryRef hidProperties;
+    CFTypeRef refCF;
+
+    /* Clear all the memory. */
+    SDL_memset(SDL_hapticlist, 0, sizeof(SDL_hapticlist));
+
+    /* Get HID devices. */
+    match = IOServiceMatching(kIOHIDDeviceKey);
+    if (match == NULL) {
+        SDL_SetError("Haptic: Failed to get IOServiceMatching.");
+        return -1;
+    }
+
+    /* Now search I/O Registry for matching devices. */
+    result = IOServiceGetMatchingServices(kIOMasterPortDefault, match, &iter);
+    if (result != kIOReturnSuccess) {
+        SDL_SetError("Haptic: Couldn't create a HID object iterator.");
+        return -1;
+    }
+    /* IOServiceGetMatchingServices consumes dictionary. */
+
+    if (!IOIteratorIsValid(iter)) {     /* No iterator. */
+        numhaptics = 0;
+        return 0;
+    }
+
+    numhaptics = 0;
+    while ((device = IOIteratorNext(iter)) != IO_OBJECT_NULL) {
+
+        /* Check for force feedback. */
+        if (FFIsForceFeedback(device) == FF_OK) {
+
+            /* Set basic device data. */
+            HIDGetDeviceProduct(device, SDL_hapticlist[numhaptics].name);
+            SDL_hapticlist[numhaptics].dev = device;
+            SDL_hapticlist[numhaptics].haptic = NULL;
+
+            /* Set usage pages. */
+            hidProperties = 0;
+            refCF = 0;
+            result = IORegistryEntryCreateCFProperties(device,
+                                                       &hidProperties,
+                                                       kCFAllocatorDefault,
+                                                       kNilOptions);
+            if ((result == KERN_SUCCESS) && hidProperties) {
+                refCF =
+                    CFDictionaryGetValue(hidProperties,
+                                         CFSTR(kIOHIDPrimaryUsagePageKey));
+                if (refCF) {
+                    if (!CFNumberGetValue(refCF, kCFNumberLongType,
+                                          &SDL_hapticlist[numhaptics].
+                                          usagePage))
+                        SDL_SetError
+                            ("Haptic: Recieving device's usage page.");
+                    refCF =
+                        CFDictionaryGetValue(hidProperties,
+                                             CFSTR(kIOHIDPrimaryUsageKey));
+                    if (refCF) {
+                        if (!CFNumberGetValue(refCF, kCFNumberLongType,
+                                              &SDL_hapticlist[numhaptics].
+                                              usage))
+                            SDL_SetError("Haptic: Recieving device's usage.");
+                    }
+                }
+                CFRelease(hidProperties);
+            }
+
+            /* Device has been added. */
+            numhaptics++;
+        } else {                /* Free the unused device. */
+            IOObjectRelease(device);
+        }
+
+        /* Reached haptic limit. */
+        if (numhaptics >= MAX_HAPTICS)
+            break;
+    }
+    IOObjectRelease(iter);
+
+    return numhaptics;
+}
+
+
+/*
+ * Return the name of a haptic device, does not need to be opened.
+ */
+const char *
+SDL_SYS_HapticName(int index)
+{
+    return SDL_hapticlist[index].name;
+}
+
+/*
+ * Gets the device's product name.
+ */
+static int
+HIDGetDeviceProduct(io_service_t dev, char *name)
+{
+    CFMutableDictionaryRef hidProperties, usbProperties;
+    io_registry_entry_t parent1, parent2;
+    kern_return_t ret;
+
+    hidProperties = usbProperties = 0;
+
+    ret = IORegistryEntryCreateCFProperties(dev, &hidProperties,
+                                            kCFAllocatorDefault, kNilOptions);
+    if ((ret != KERN_SUCCESS) || !hidProperties) {
+        SDL_SetError("Haptic: Unable to create CFProperties.");
+        return -1;
+    }
+
+    /* 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(dev, 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, name, 256,
+                                        CFStringGetSystemEncoding())) {
+                    SDL_SetError
+                        ("Haptic: CFStringGetCString error retrieving pDevice->product.");
+                    return -1;
+                }
+            }
+
+            CFRelease(usbProperties);
+        } else {
+            SDL_SetError
+                ("Haptic: IORegistryEntryCreateCFProperties failed to create usbProperties.");
+            return -1;
+        }
+
+        /* Release stuff. */
+        if (kIOReturnSuccess != IOObjectRelease(parent2)) {
+            SDL_SetError("Haptic: IOObjectRelease error with parent2.");
+        }
+        if (kIOReturnSuccess != IOObjectRelease(parent1)) {
+            SDL_SetError("Haptic: IOObjectRelease error with parent1.");
+        }
+    } else {
+        SDL_SetError("Haptic: Error getting registry entries.");
+        return -1;
+    }
+
+    return 0;
+}
+
+
+#define FF_TEST(ff, s) \
+if (features.supportedEffects & (ff)) supported |= (s)
+/*
+ * Gets supported features.
+ */
+static unsigned int
+GetSupportedFeatures(SDL_Haptic * haptic)
+{
+    HRESULT ret;
+    FFDeviceObjectReference device;
+    FFCAPABILITIES features;
+    unsigned int supported;
+    Uint32 val;
+
+    device = haptic->hwdata->device;
+
+    ret = FFDeviceGetForceFeedbackCapabilities(device, &features);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to get device's supported features.");
+        return -1;
+    }
+
+    supported = 0;
+
+    /* Get maximum effects. */
+    haptic->neffects = features.storageCapacity;
+    haptic->nplaying = features.playbackCapacity;
+
+    /* Test for effects. */
+    FF_TEST(FFCAP_ET_CONSTANTFORCE, SDL_HAPTIC_CONSTANT);
+    FF_TEST(FFCAP_ET_RAMPFORCE, SDL_HAPTIC_RAMP);
+    FF_TEST(FFCAP_ET_SQUARE, SDL_HAPTIC_SQUARE);
+    FF_TEST(FFCAP_ET_SINE, SDL_HAPTIC_SINE);
+    FF_TEST(FFCAP_ET_TRIANGLE, SDL_HAPTIC_TRIANGLE);
+    FF_TEST(FFCAP_ET_SAWTOOTHUP, SDL_HAPTIC_SAWTOOTHUP);
+    FF_TEST(FFCAP_ET_SAWTOOTHDOWN, SDL_HAPTIC_SAWTOOTHDOWN);
+    FF_TEST(FFCAP_ET_SPRING, SDL_HAPTIC_SPRING);
+    FF_TEST(FFCAP_ET_DAMPER, SDL_HAPTIC_DAMPER);
+    FF_TEST(FFCAP_ET_INERTIA, SDL_HAPTIC_INERTIA);
+    FF_TEST(FFCAP_ET_FRICTION, SDL_HAPTIC_FRICTION);
+    FF_TEST(FFCAP_ET_CUSTOMFORCE, SDL_HAPTIC_CUSTOM);
+
+    /* Check if supports gain. */
+    ret = FFDeviceGetForceFeedbackProperty(device, FFPROP_FFGAIN,
+                                           &val, sizeof(val));
+    if (ret == FF_OK)
+        supported |= SDL_HAPTIC_GAIN;
+    else if (ret != FFERR_UNSUPPORTED) {
+        SDL_SetError("Haptic: Unable to get if device supports gain: %s.",
+                     FFStrError(ret));
+        return -1;
+    }
+
+    /* Checks if supports autocenter. */
+    ret = FFDeviceGetForceFeedbackProperty(device, FFPROP_AUTOCENTER,
+                                           &val, sizeof(val));
+    if (ret == FF_OK)
+        supported |= SDL_HAPTIC_AUTOCENTER;
+    else if (ret != FFERR_UNSUPPORTED) {
+        SDL_SetError
+            ("Haptic: Unable to get if device supports autocenter: %s.",
+             FFStrError(ret));
+        return -1;
+    }
+
+    /* Check for axes, we have an artificial limit on axes */
+    haptic->naxes = ((features.numFfAxes) > 3) ? 3 : features.numFfAxes;
+    /* Actually store the axes we want to use */
+    SDL_memcpy(haptic->hwdata->axes, features.ffAxes,
+               haptic->naxes * sizeof(Uint8));
+
+    /* Always supported features. */
+    supported |= SDL_HAPTIC_STATUS | SDL_HAPTIC_PAUSE;
+
+    haptic->supported = supported;
+    return 0;;
+}
+
+
+/*
+ * Opens the haptic device from the file descriptor.
+ */
+static int
+SDL_SYS_HapticOpenFromService(SDL_Haptic * haptic, io_service_t service)
+{
+    HRESULT ret;
+    int ret2;
+
+    /* Allocate the hwdata */
+    haptic->hwdata = (struct haptic_hwdata *)
+        SDL_malloc(sizeof(*haptic->hwdata));
+    if (haptic->hwdata == NULL) {
+        SDL_OutOfMemory();
+        goto creat_err;
+    }
+    SDL_memset(haptic->hwdata, 0, sizeof(*haptic->hwdata));
+
+    /* Open the device */
+    ret = FFCreateDevice(service, &haptic->hwdata->device);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to create device from service: %s.",
+                     FFStrError(ret));
+        goto creat_err;
+    }
+
+    /* Get supported features. */
+    ret2 = GetSupportedFeatures(haptic);
+    if (haptic->supported < 0) {
+        goto open_err;
+    }
+
+
+    /* Reset and then enable actuators. */
+    ret = FFDeviceSendForceFeedbackCommand(haptic->hwdata->device,
+                                           FFSFFC_RESET);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to reset device: %s.", FFStrError(ret));
+        goto open_err;
+    }
+    ret = FFDeviceSendForceFeedbackCommand(haptic->hwdata->device,
+                                           FFSFFC_SETACTUATORSON);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to enable actuators: %s.",
+                     FFStrError(ret));
+        goto open_err;
+    }
+
+
+    /* Allocate effects memory. */
+    haptic->effects = (struct haptic_effect *)
+        SDL_malloc(sizeof(struct haptic_effect) * haptic->neffects);
+    if (haptic->effects == NULL) {
+        SDL_OutOfMemory();
+        goto open_err;
+    }
+    /* Clear the memory */
+    SDL_memset(haptic->effects, 0,
+               sizeof(struct haptic_effect) * haptic->neffects);
+
+    return 0;
+
+    /* Error handling */
+  open_err:
+    FFReleaseDevice(haptic->hwdata->device);
+  creat_err:
+    if (haptic->hwdata != NULL) {
+        free(haptic->hwdata);
+        haptic->hwdata = NULL;
+    }
+    return -1;
+
+}
+
+
+/*
+ * Opens a haptic device for usage.
+ */
+int
+SDL_SYS_HapticOpen(SDL_Haptic * haptic)
+{
+    return SDL_SYS_HapticOpenFromService(haptic,
+                                         SDL_hapticlist[haptic->index].dev);
+}
+
+
+/*
+ * Opens a haptic device from first mouse it finds for usage.
+ */
+int
+SDL_SYS_HapticMouse(void)
+{
+    int i;
+
+    for (i = 0; i < SDL_numhaptics; i++) {
+        if ((SDL_hapticlist[i].usagePage == kHIDPage_GenericDesktop) &&
+            (SDL_hapticlist[i].usage == kHIDUsage_GD_Mouse))
+            return i;
+    }
+
+    return -1;
+}
+
+
+/*
+ * Checks to see if a joystick has haptic features.
+ */
+int
+SDL_SYS_JoystickIsHaptic(SDL_Joystick * joystick)
+{
+    if (joystick->hwdata->ffservice != 0)
+        return SDL_TRUE;
+    return SDL_FALSE;
+}
+
+
+/*
+ * Checks to see if the haptic device and joystick and in reality the same.
+ */
+int
+SDL_SYS_JoystickSameHaptic(SDL_Haptic * haptic, SDL_Joystick * joystick)
+{
+    if (IOObjectIsEqualTo((io_object_t) haptic->hwdata->device,
+                          joystick->hwdata->ffservice))
+        return 1;
+    return 0;
+}
+
+
+/*
+ * Opens a SDL_Haptic from a SDL_Joystick.
+ */
+int
+SDL_SYS_HapticOpenFromJoystick(SDL_Haptic * haptic, SDL_Joystick * joystick)
+{
+    return SDL_SYS_HapticOpenFromService(haptic, joystick->hwdata->ffservice);
+}
+
+
+/*
+ * Closes the haptic device.
+ */
+void
+SDL_SYS_HapticClose(SDL_Haptic * haptic)
+{
+    if (haptic->hwdata) {
+
+        /* Free Effects. */
+        SDL_free(haptic->effects);
+        haptic->effects = NULL;
+        haptic->neffects = 0;
+
+        /* Clean up */
+        FFReleaseDevice(haptic->hwdata->device);
+
+        /* Free */
+        SDL_free(haptic->hwdata);
+        haptic->hwdata = NULL;
+    }
+}
+
+
+/* 
+ * Clean up after system specific haptic stuff
+ */
+void
+SDL_SYS_HapticQuit(void)
+{
+    int i;
+
+    for (i = 0; i < SDL_numhaptics; i++) {
+        /* Opened and not closed haptics are leaked, this is on purpose.
+         * Close your haptic devices after usage. */
+
+        /* Free the io_service_t */
+        IOObjectRelease(SDL_hapticlist[i].dev);
+    }
+}
+
+
+/*
+ * Converts an SDL trigger button to an FFEFFECT trigger button.
+ */
+static DWORD
+FFGetTriggerButton(Uint16 button)
+{
+    DWORD dwTriggerButton;
+
+    dwTriggerButton = FFEB_NOTRIGGER;
+
+    if (button != 0) {
+        dwTriggerButton = FFJOFS_BUTTON(button - 1);
+    }
+
+    return dwTriggerButton;
+}
+
+
+/*
+ * Sets the direction.
+ */
+static int
+SDL_SYS_SetDirection(FFEFFECT * effect, SDL_HapticDirection * dir, int naxes)
+{
+    LONG *rglDir;
+
+    /* Handle no axes a part. */
+    if (naxes == 0) {
+        effect->dwFlags |= FFEFF_SPHERICAL;     /* Set as default. */
+        effect->rglDirection = NULL;
+        return 0;
+    }
+
+    /* Has axes. */
+    rglDir = SDL_malloc(sizeof(LONG) * naxes);
+    if (rglDir == NULL) {
+        SDL_OutOfMemory();
+        return -1;
+    }
+    SDL_memset(rglDir, 0, sizeof(LONG) * naxes);
+    effect->rglDirection = rglDir;
+
+    switch (dir->type) {
+    case SDL_HAPTIC_POLAR:
+        effect->dwFlags |= FFEFF_POLAR;
+        rglDir[0] = dir->dir[0];
+        return 0;
+    case SDL_HAPTIC_CARTESIAN:
+        effect->dwFlags |= FFEFF_CARTESIAN;
+        rglDir[0] = dir->dir[0];
+        if (naxes > 1)
+            rglDir[1] = dir->dir[1];
+        if (naxes > 2)
+            rglDir[2] = dir->dir[2];
+        return 0;
+    case SDL_HAPTIC_SPHERICAL:
+        effect->dwFlags |= FFEFF_SPHERICAL;
+        rglDir[0] = dir->dir[0];
+        if (naxes > 1)
+            rglDir[1] = dir->dir[1];
+        if (naxes > 2)
+            rglDir[2] = dir->dir[2];
+        return 0;
+
+    default:
+        SDL_SetError("Haptic: Unknown direction type.");
+        return -1;
+    }
+}
+
+
+/* Clamps and converts. */
+#define CCONVERT(x)   (((x) > 0x7FFF) ? 10000 : ((x)*10000) / 0x7FFF)
+/* Just converts. */
+#define CONVERT(x)    (((x)*10000) / 0x7FFF)
+/*
+ * Creates the FFEFFECT from a SDL_HapticEffect.
+ */
+static int
+SDL_SYS_ToFFEFFECT(SDL_Haptic * haptic, FFEFFECT * dest,
+                   SDL_HapticEffect * src)
+{
+    int i;
+    FFCONSTANTFORCE *constant;
+    FFPERIODIC *periodic;
+    FFCONDITION *condition;     /* Actually an array of conditions - one per axis. */
+    FFRAMPFORCE *ramp;
+    FFCUSTOMFORCE *custom;
+    FFENVELOPE *envelope;
+    SDL_HapticConstant *hap_constant;
+    SDL_HapticPeriodic *hap_periodic;
+    SDL_HapticCondition *hap_condition;
+    SDL_HapticRamp *hap_ramp;
+    SDL_HapticCustom *hap_custom;
+    DWORD *axes;
+
+    /* Set global stuff. */
+    SDL_memset(dest, 0, sizeof(FFEFFECT));
+    dest->dwSize = sizeof(FFEFFECT);    /* Set the structure size. */
+    dest->dwSamplePeriod = 0;   /* Not used by us. */
+    dest->dwGain = 10000;       /* Gain is set globally, not locally. */
+    dest->dwFlags = FFEFF_OBJECTOFFSETS;        /* Seems obligatory. */
+
+    /* Envelope. */
+    envelope = SDL_malloc(sizeof(FFENVELOPE));
+    if (envelope == NULL) {
+        SDL_OutOfMemory();
+        return -1;
+    }
+    SDL_memset(envelope, 0, sizeof(FFENVELOPE));
+    dest->lpEnvelope = envelope;
+    envelope->dwSize = sizeof(FFENVELOPE);      /* Always should be this. */
+
+    /* Axes. */
+    dest->cAxes = haptic->naxes;
+    if (dest->cAxes > 0) {
+        axes = SDL_malloc(sizeof(DWORD) * dest->cAxes);
+        if (axes == NULL) {
+            SDL_OutOfMemory();
+            return -1;
+        }
+        axes[0] = haptic->hwdata->axes[0];      /* Always at least one axis. */
+        if (dest->cAxes > 1) {
+            axes[1] = haptic->hwdata->axes[1];
+        }
+        if (dest->cAxes > 2) {
+            axes[2] = haptic->hwdata->axes[2];
+        }
+        dest->rgdwAxes = axes;
+    }
+
+
+    /* The big type handling switch, even bigger then linux's version. */
+    switch (src->type) {
+    case SDL_HAPTIC_CONSTANT:
+        hap_constant = &src->constant;
+        constant = SDL_malloc(sizeof(FFCONSTANTFORCE));
+        if (constant == NULL) {
+            SDL_OutOfMemory();
+            return -1;
+        }
+        SDL_memset(constant, 0, sizeof(FFCONSTANTFORCE));
+
+        /* Specifics */
+        constant->lMagnitude = CONVERT(hap_constant->level);
+        dest->cbTypeSpecificParams = sizeof(FFCONSTANTFORCE);
+        dest->lpvTypeSpecificParams = constant;
+
+        /* Generics */
+        dest->dwDuration = hap_constant->length * 1000; /* In microseconds. */
+        dest->dwTriggerButton = FFGetTriggerButton(hap_constant->button);
+        dest->dwTriggerRepeatInterval = hap_constant->interval;
+        dest->dwStartDelay = hap_constant->delay * 1000;        /* In microseconds. */
+
+        /* Direction. */
+        if (SDL_SYS_SetDirection(dest, &hap_constant->direction, dest->cAxes)
+            < 0) {
+            return -1;
+        }
+
+        /* Envelope */
+        if ((hap_constant->attack_length == 0)
+            && (hap_constant->fade_length == 0)) {
+            SDL_free(envelope);
+            dest->lpEnvelope = NULL;
+        } else {
+            envelope->dwAttackLevel = CCONVERT(hap_constant->attack_level);
+            envelope->dwAttackTime = hap_constant->attack_length * 1000;
+            envelope->dwFadeLevel = CCONVERT(hap_constant->fade_level);
+            envelope->dwFadeTime = hap_constant->fade_length * 1000;
+        }
+
+        break;
+
+    case SDL_HAPTIC_SINE:
+    case SDL_HAPTIC_SQUARE:
+    case SDL_HAPTIC_TRIANGLE:
+    case SDL_HAPTIC_SAWTOOTHUP:
+    case SDL_HAPTIC_SAWTOOTHDOWN:
+        hap_periodic = &src->periodic;
+        periodic = SDL_malloc(sizeof(FFPERIODIC));
+        if (periodic == NULL) {
+            SDL_OutOfMemory();
+            return -1;
+        }
+        SDL_memset(periodic, 0, sizeof(FFPERIODIC));
+
+        /* Specifics */
+        periodic->dwMagnitude = CONVERT(hap_periodic->magnitude);
+        periodic->lOffset = CONVERT(hap_periodic->offset);
+        periodic->dwPhase = hap_periodic->phase;
+        periodic->dwPeriod = hap_periodic->period * 1000;
+        dest->cbTypeSpecificParams = sizeof(FFPERIODIC);
+        dest->lpvTypeSpecificParams = periodic;
+
+        /* Generics */
+        dest->dwDuration = hap_periodic->length * 1000; /* In microseconds. */
+        dest->dwTriggerButton = FFGetTriggerButton(hap_periodic->button);
+        dest->dwTriggerRepeatInterval = hap_periodic->interval;
+        dest->dwStartDelay = hap_periodic->delay * 1000;        /* In microseconds. */
+
+        /* Direction. */
+        if (SDL_SYS_SetDirection(dest, &hap_periodic->direction, dest->cAxes)
+            < 0) {
+            return -1;
+        }
+
+        /* Envelope */
+        if ((hap_periodic->attack_length == 0)
+            && (hap_periodic->fade_length == 0)) {
+            SDL_free(envelope);
+            dest->lpEnvelope = NULL;
+        } else {
+            envelope->dwAttackLevel = CCONVERT(hap_periodic->attack_level);
+            envelope->dwAttackTime = hap_periodic->attack_length * 1000;
+            envelope->dwFadeLevel = CCONVERT(hap_periodic->fade_level);
+            envelope->dwFadeTime = hap_periodic->fade_length * 1000;
+        }
+
+        break;
+
+    case SDL_HAPTIC_SPRING:
+    case SDL_HAPTIC_DAMPER:
+    case SDL_HAPTIC_INERTIA:
+    case SDL_HAPTIC_FRICTION:
+        hap_condition = &src->condition;
+        condition = SDL_malloc(sizeof(FFCONDITION) * dest->cAxes);
+        if (condition == NULL) {
+            SDL_OutOfMemory();
+            return -1;
+        }
+        SDL_memset(condition, 0, sizeof(FFCONDITION));
+
+        /* Specifics */
+        for (i = 0; i < dest->cAxes; i++) {
+            condition[i].lOffset = CONVERT(hap_condition->center[i]);
+            condition[i].lPositiveCoefficient =
+                CONVERT(hap_condition->right_coeff[i]);
+            condition[i].lNegativeCoefficient =
+                CONVERT(hap_condition->left_coeff[i]);
+            condition[i].dwPositiveSaturation =
+                CCONVERT(hap_condition->right_sat[i]);
+            condition[i].dwNegativeSaturation =
+                CCONVERT(hap_condition->left_sat[i]);
+            condition[i].lDeadBand = CCONVERT(hap_condition->deadband[i]);
+        }
+        dest->cbTypeSpecificParams = sizeof(FFCONDITION) * dest->cAxes;
+        dest->lpvTypeSpecificParams = condition;
+
+        /* Generics */
+        dest->dwDuration = hap_condition->length * 1000;        /* In microseconds. */
+        dest->dwTriggerButton = FFGetTriggerButton(hap_condition->button);
+        dest->dwTriggerRepeatInterval = hap_condition->interval;
+        dest->dwStartDelay = hap_condition->delay * 1000;       /* In microseconds. */
+
+        /* Direction. */
+        if (SDL_SYS_SetDirection(dest, &hap_condition->direction, dest->cAxes)
+            < 0) {
+            return -1;
+        }
+
+        /* Envelope - Not actually supported by most CONDITION implementations. */
+        SDL_free(dest->lpEnvelope);
+        dest->lpEnvelope = NULL;
+
+        break;
+
+    case SDL_HAPTIC_RAMP:
+        hap_ramp = &src->ramp;
+        ramp = SDL_malloc(sizeof(FFRAMPFORCE));
+        if (ramp == NULL) {
+            SDL_OutOfMemory();
+            return -1;
+        }
+        SDL_memset(ramp, 0, sizeof(FFRAMPFORCE));
+
+        /* Specifics */
+        ramp->lStart = CONVERT(hap_ramp->start);
+        ramp->lEnd = CONVERT(hap_ramp->end);
+        dest->cbTypeSpecificParams = sizeof(FFRAMPFORCE);
+        dest->lpvTypeSpecificParams = ramp;
+
+        /* Generics */
+        dest->dwDuration = hap_ramp->length * 1000;     /* In microseconds. */
+        dest->dwTriggerButton = FFGetTriggerButton(hap_ramp->button);
+        dest->dwTriggerRepeatInterval = hap_ramp->interval;
+        dest->dwStartDelay = hap_ramp->delay * 1000;    /* In microseconds. */
+
+        /* Direction. */
+        if (SDL_SYS_SetDirection(dest, &hap_ramp->direction, dest->cAxes) < 0) {
+            return -1;
+        }
+
+        /* Envelope */
+        if ((hap_ramp->attack_length == 0) && (hap_ramp->fade_length == 0)) {
+            SDL_free(envelope);
+            dest->lpEnvelope = NULL;
+        } else {
+            envelope->dwAttackLevel = CCONVERT(hap_ramp->attack_level);
+            envelope->dwAttackTime = hap_ramp->attack_length * 1000;
+            envelope->dwFadeLevel = CCONVERT(hap_ramp->fade_level);
+            envelope->dwFadeTime = hap_ramp->fade_length * 1000;
+        }
+
+        break;
+
+    case SDL_HAPTIC_CUSTOM:
+        hap_custom = &src->custom;
+        custom = SDL_malloc(sizeof(FFCUSTOMFORCE));
+        if (custom == NULL) {
+            SDL_OutOfMemory();
+            return -1;
+        }
+        SDL_memset(custom, 0, sizeof(FFCUSTOMFORCE));
+
+        /* Specifics */
+        custom->cChannels = hap_custom->channels;
+        custom->dwSamplePeriod = hap_custom->period * 1000;
+        custom->cSamples = hap_custom->samples;
+        custom->rglForceData =
+            SDL_malloc(sizeof(LONG) * custom->cSamples * custom->cChannels);
+        for (i = 0; i < hap_custom->samples * hap_custom->channels; i++) {      /* Copy data. */
+            custom->rglForceData[i] = CCONVERT(hap_custom->data[i]);
+        }
+        dest->cbTypeSpecificParams = sizeof(FFCUSTOMFORCE);
+        dest->lpvTypeSpecificParams = custom;
+
+        /* Generics */
+        dest->dwDuration = hap_custom->length * 1000;   /* In microseconds. */
+        dest->dwTriggerButton = FFGetTriggerButton(hap_custom->button);
+        dest->dwTriggerRepeatInterval = hap_custom->interval;
+        dest->dwStartDelay = hap_custom->delay * 1000;  /* In microseconds. */
+
+        /* Direction. */
+        if (SDL_SYS_SetDirection(dest, &hap_custom->direction, dest->cAxes) <
+            0) {
+            return -1;
+        }
+
+        /* Envelope */
+        if ((hap_custom->attack_length == 0)
+            && (hap_custom->fade_length == 0)) {
+            SDL_free(envelope);
+            dest->lpEnvelope = NULL;
+        } else {
+            envelope->dwAttackLevel = CCONVERT(hap_custom->attack_level);
+            envelope->dwAttackTime = hap_custom->attack_length * 1000;
+            envelope->dwFadeLevel = CCONVERT(hap_custom->fade_level);
+            envelope->dwFadeTime = hap_custom->fade_length * 1000;
+        }
+
+        break;
+
+
+    default:
+        SDL_SetError("Haptic: Unknown effect type.");
+        return -1;
+    }
+
+    return 0;
+}
+
+
+/*
+ * Frees an FFEFFECT allocated by SDL_SYS_ToFFEFFECT.
+ */
+static void
+SDL_SYS_HapticFreeFFEFFECT(FFEFFECT * effect, int type)
+{
+    FFCUSTOMFORCE *custom;
+
+    if (effect->lpEnvelope != NULL) {
+        SDL_free(effect->lpEnvelope);
+        effect->lpEnvelope = NULL;
+    }
+    if (effect->rgdwAxes != NULL) {
+        SDL_free(effect->rgdwAxes);
+        effect->rgdwAxes = NULL;
+    }
+    if (effect->lpvTypeSpecificParams != NULL) {
+        if (type == SDL_HAPTIC_CUSTOM) {        /* Must free the custom data. */
+            custom = (FFCUSTOMFORCE *) effect->lpvTypeSpecificParams;
+            SDL_free(custom->rglForceData);
+            custom->rglForceData = NULL;
+        }
+        SDL_free(effect->lpvTypeSpecificParams);
+        effect->lpvTypeSpecificParams = NULL;
+    }
+    if (effect->rglDirection != NULL) {
+        SDL_free(effect->rglDirection);
+        effect->rglDirection = NULL;
+    }
+}
+
+
+/*
+ * Gets the effect type from the generic SDL haptic effect wrapper.
+ */
+CFUUIDRef
+SDL_SYS_HapticEffectType(Uint16 type)
+{
+    switch (type) {
+    case SDL_HAPTIC_CONSTANT:
+        return kFFEffectType_ConstantForce_ID;
+
+    case SDL_HAPTIC_RAMP:
+        return kFFEffectType_RampForce_ID;
+
+    case SDL_HAPTIC_SQUARE:
+        return kFFEffectType_Square_ID;
+
+    case SDL_HAPTIC_SINE:
+        return kFFEffectType_Sine_ID;
+
+    case SDL_HAPTIC_TRIANGLE:
+        return kFFEffectType_Triangle_ID;
+
+    case SDL_HAPTIC_SAWTOOTHUP:
+        return kFFEffectType_SawtoothUp_ID;
+
+    case SDL_HAPTIC_SAWTOOTHDOWN:
+        return kFFEffectType_SawtoothDown_ID;
+
+    case SDL_HAPTIC_SPRING:
+        return kFFEffectType_Spring_ID;
+
+    case SDL_HAPTIC_DAMPER:
+        return kFFEffectType_Damper_ID;
+
+    case SDL_HAPTIC_INERTIA:
+        return kFFEffectType_Inertia_ID;
+
+    case SDL_HAPTIC_FRICTION:
+        return kFFEffectType_Friction_ID;
+
+    case SDL_HAPTIC_CUSTOM:
+        return kFFEffectType_CustomForce_ID;
+
+    default:
+        SDL_SetError("Haptic: Unknown effect type.");
+        return NULL;
+    }
+}
+
+
+/*
+ * Creates a new haptic effect.
+ */
+int
+SDL_SYS_HapticNewEffect(SDL_Haptic * haptic, struct haptic_effect *effect,
+                        SDL_HapticEffect * base)
+{
+    HRESULT ret;
+    CFUUIDRef type;
+
+    /* Alloc the effect. */
+    effect->hweffect = (struct haptic_hweffect *)
+        SDL_malloc(sizeof(struct haptic_hweffect));
+    if (effect->hweffect == NULL) {
+        SDL_OutOfMemory();
+        goto err_hweffect;
+    }
+
+    /* Get the type. */
+    type = SDL_SYS_HapticEffectType(base->type);
+    if (type == NULL) {
+        goto err_hweffect;
+    }
+
+    /* Get the effect. */
+    if (SDL_SYS_ToFFEFFECT(haptic, &effect->hweffect->effect, base) < 0) {
+        goto err_effectdone;
+    }
+
+    /* Create the actual effect. */
+    ret = FFDeviceCreateEffect(haptic->hwdata->device, type,
+                               &effect->hweffect->effect,
+                               &effect->hweffect->ref);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to create effect: %s.", FFStrError(ret));
+        goto err_effectdone;
+    }
+
+    return 0;
+
+  err_effectdone:
+    SDL_SYS_HapticFreeFFEFFECT(&effect->hweffect->effect, base->type);
+  err_hweffect:
+    if (effect->hweffect != NULL) {
+        SDL_free(effect->hweffect);
+        effect->hweffect = NULL;
+    }
+    return -1;
+}
+
+
+/*
+ * Updates an effect.
+ */
+int
+SDL_SYS_HapticUpdateEffect(SDL_Haptic * haptic,
+                           struct haptic_effect *effect,
+                           SDL_HapticEffect * data)
+{
+    HRESULT ret;
+    FFEffectParameterFlag flags;
+    FFEFFECT temp;
+
+    /* Get the effect. */
+    SDL_memset(&temp, 0, sizeof(FFEFFECT));
+    if (SDL_SYS_ToFFEFFECT(haptic, &temp, data) < 0) {
+        goto err_update;
+    }
+
+    /* Set the flags.  Might be worthwhile to diff temp with loaded effect and
+     *  only change those parameters. */
+    flags = FFEP_DIRECTION |
+        FFEP_DURATION |
+        FFEP_ENVELOPE |
+        FFEP_STARTDELAY |
+        FFEP_TRIGGERBUTTON |
+        FFEP_TRIGGERREPEATINTERVAL | FFEP_TYPESPECIFICPARAMS;
+
+    /* Create the actual effect. */
+    ret = FFEffectSetParameters(effect->hweffect->ref, &temp, flags);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to update effect: %s.", FFStrError(ret));
+        goto err_update;
+    }
+
+    /* Copy it over. */
+    SDL_SYS_HapticFreeFFEFFECT(&effect->hweffect->effect, data->type);
+    SDL_memcpy(&effect->hweffect->effect, &temp, sizeof(FFEFFECT));
+
+    return 0;
+
+  err_update:
+    SDL_SYS_HapticFreeFFEFFECT(&temp, data->type);
+    return -1;
+}
+
+
+/*
+ * Runs an effect.
+ */
+int
+SDL_SYS_HapticRunEffect(SDL_Haptic * haptic, struct haptic_effect *effect,
+                        Uint32 iterations)
+{
+    HRESULT ret;
+    Uint32 iter;
+
+    /* Check if it's infinite. */
+    if (iterations == SDL_HAPTIC_INFINITY) {
+        iter = FF_INFINITE;
+    } else
+        iter = iterations;
+
+    /* Run the effect. */
+    ret = FFEffectStart(effect->hweffect->ref, iter, 0);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to run the effect: %s.",
+                     FFStrError(ret));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+/*
+ * Stops an effect.
+ */
+int
+SDL_SYS_HapticStopEffect(SDL_Haptic * haptic, struct haptic_effect *effect)
+{
+    HRESULT ret;
+
+    ret = FFEffectStop(effect->hweffect->ref);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to stop the effect: %s.",
+                     FFStrError(ret));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+/*
+ * Frees the effect.
+ */
+void
+SDL_SYS_HapticDestroyEffect(SDL_Haptic * haptic, struct haptic_effect *effect)
+{
+    HRESULT ret;
+
+    ret =
+        FFDeviceReleaseEffect(haptic->hwdata->device, effect->hweffect->ref);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Error removing the effect from the device: %s.",
+                     FFStrError(ret));
+    }
+    SDL_SYS_HapticFreeFFEFFECT(&effect->hweffect->effect,
+                               effect->effect.type);
+    SDL_free(effect->hweffect);
+    effect->hweffect = NULL;
+}
+
+
+/*
+ * Gets the status of a haptic effect.
+ */
+int
+SDL_SYS_HapticGetEffectStatus(SDL_Haptic * haptic,
+                              struct haptic_effect *effect)
+{
+    HRESULT ret;
+    FFEffectStatusFlag status;
+
+    ret = FFEffectGetEffectStatus(effect->hweffect->ref, &status);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Unable to get effect status: %s.",
+                     FFStrError(ret));
+        return -1;
+    }
+
+    if (status == 0)
+        return SDL_FALSE;
+    return SDL_TRUE;            /* Assume it's playing or emulated. */
+}
+
+
+/*
+ * Sets the gain.
+ */
+int
+SDL_SYS_HapticSetGain(SDL_Haptic * haptic, int gain)
+{
+    HRESULT ret;
+    Uint32 val;
+
+    val = gain * 100;           /* Mac OS X uses 0 to 10,000 */
+    ret =
+        FFDeviceSetForceFeedbackProperty(haptic->hwdata->device,
+                                         FFPROP_FFGAIN, &val);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Error setting gain: %s.", FFStrError(ret));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+/*
+ * Sets the autocentering.
+ */
+int
+SDL_SYS_HapticSetAutocenter(SDL_Haptic * haptic, int autocenter)
+{
+    HRESULT ret;
+    Uint32 val;
+
+    /* Mac OS X only has 0 (off) and 1 (on) */
+    if (autocenter == 0)
+        val = 0;
+    else
+        val = 1;
+
+    ret = FFDeviceSetForceFeedbackProperty(haptic->hwdata->device,
+                                           FFPROP_AUTOCENTER, &val);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Error setting autocenter: %s.",
+                     FFStrError(ret));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+/*
+ * Pauses the device.
+ */
+int
+SDL_SYS_HapticPause(SDL_Haptic * haptic)
+{
+    HRESULT ret;
+
+    ret = FFDeviceSendForceFeedbackCommand(haptic->hwdata->device,
+                                           FFSFFC_PAUSE);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Error pausing device: %s.", FFStrError(ret));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+/*
+ * Unpauses the device.
+ */
+int
+SDL_SYS_HapticUnpause(SDL_Haptic * haptic)
+{
+    HRESULT ret;
+
+    ret = FFDeviceSendForceFeedbackCommand(haptic->hwdata->device,
+                                           FFSFFC_CONTINUE);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Error pausing device: %s.", FFStrError(ret));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+/*
+ * Stops all currently playing effects.
+ */
+int
+SDL_SYS_HapticStopAll(SDL_Haptic * haptic)
+{
+    HRESULT ret;
+
+    ret = FFDeviceSendForceFeedbackCommand(haptic->hwdata->device,
+                                           FFSFFC_STOPALL);
+    if (ret != FF_OK) {
+        SDL_SetError("Haptic: Error stopping device: %s.", FFStrError(ret));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+#endif /* SDL_HAPTIC_IOKIT */