/*

Simple DirectMedia Layer

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

#include "../../SDL_internal.h"

/* This is the iOS implementation of the SDL joystick API */

#include "SDL_sysjoystick_c.h"

/* needed for SDL_IPHONE_MAX_GFORCE macro */

#include "SDL_config_iphoneos.h"

#include "SDL_joystick.h"

#include "SDL_hints.h"

#include "SDL_stdinc.h"

#include "../SDL_sysjoystick.h"

#include "../SDL_joystick_c.h"

#import <CoreMotion/CoreMotion.h>

#ifdef SDL_JOYSTICK_MFI

#import <GameController/GameController.h>

static id connectObserver = nil;

static id disconnectObserver = nil;

#endif /* SDL_JOYSTICK_MFI */

static SDL_JoystickDeviceItem *deviceList = NULL;

static SDL_JoystickID instancecounter = 0;

static SDL_JoystickDeviceItem *

GetDeviceForIndex(int device_index)

{

SDL_JoystickDeviceItem *device = deviceList;

int i = 0;

while (i < device_index) {

if (device == NULL) {

return NULL;

}

device = device->next;

i++;

}

return device;

}

static void

SDL_SYS_AddMFIJoystickDevice(SDL_JoystickDeviceItem *device, GCController *controller)

{

#ifdef SDL_JOYSTICK_MFI

const char *name = NULL;

/* Explicitly retain the controller because SDL_JoystickDeviceItem is a

* struct, and ARC doesn't work with structs. */

device->controller = (__bridge GCController *) CFBridgingRetain(controller);

if (controller.vendorName) {

name = controller.vendorName.UTF8String;

}

if (!name) {

name = "MFi Gamepad";

}

device->name = SDL_strdup(name);

device->guid.data[0] = 'M';

device->guid.data[1] = 'F';

device->guid.data[2] = 'i';

device->guid.data[3] = 'G';

device->guid.data[4] = 'a';

device->guid.data[5] = 'm';

device->guid.data[6] = 'e';

device->guid.data[7] = 'p';

device->guid.data[8] = 'a';

device->guid.data[9] = 'd';

if (controller.extendedGamepad) {

device->guid.data[10] = 1;

} else if (controller.gamepad) {

device->guid.data[10] = 2;

}

if (controller.extendedGamepad) {

device->naxes = 6; /* 2 thumbsticks and 2 triggers */

device->nhats = 1; /* d-pad */

device->nbuttons = 7; /* ABXY, shoulder buttons, pause button */

} else if (controller.gamepad) {

device->naxes = 0; /* no traditional analog inputs */

device->nhats = 1; /* d-pad */

device->nbuttons = 7; /* ABXY, shoulder buttons, pause button */

}

/* TODO: Handle micro profiles on tvOS. */

/* This will be set when the first button press of the controller is

* detected. */

controller.playerIndex = -1;

#endif

}

static void

SDL_SYS_AddJoystickDevice(GCController *controller, SDL_bool accelerometer)

{

SDL_JoystickDeviceItem *device = deviceList;

while (device != NULL) {

if (device->controller == controller) {

return;

}

device = device->next;

}

device = (SDL_JoystickDeviceItem *) SDL_malloc(sizeof(SDL_JoystickDeviceItem));

if (device == NULL) {

return;

}

SDL_zerop(device);

device->accelerometer = accelerometer;

device->instance_id = instancecounter++;

if (accelerometer) {

device->name = SDL_strdup(accelerometerName);

device->naxes = 3; /* Device acceleration in the x, y, and z axes. */

device->nhats = 0;

device->nbuttons = 0;

/* Use the accelerometer name as a GUID. */

SDL_memcpy(&device->guid.data, device->name, SDL_min(sizeof(SDL_JoystickGUID), SDL_strlen(device->name)));

} else if (controller) {

SDL_SYS_AddMFIJoystickDevice(device, controller);

}

if (deviceList == NULL) {

deviceList = device;

} else {

SDL_JoystickDeviceItem *lastdevice = deviceList;

while (lastdevice->next != NULL) {

lastdevice = lastdevice->next;

}

lastdevice->next = device;

}

++numjoysticks;

}

SDL_SYS_RemoveJoystickDevice(SDL_JoystickDeviceItem *device)

{

SDL_JoystickDeviceItem *prev = NULL;

SDL_JoystickDeviceItem *next = NULL;

SDL_JoystickDeviceItem *item = deviceList;

if (device == NULL) {

return NULL;

}

next = device->next;

while (item != NULL) {

if (item == device) {

break;

}

prev = item;

item = item->next;

}

/* Unlink the device item from the device list. */

if (prev) {

prev->next = device->next;

} else if (device == deviceList) {

deviceList = device->next;

}

if (device->joystick) {

device->joystick->hwdata = NULL;

}

#ifdef SDL_JOYSTICK_MFI

@autoreleasepool {

if (device->controller) {

/* The controller was explicitly retained in the struct, so it

* should be explicitly released before freeing the struct. */

GCController *controller = CFBridgingRelease((__bridge CFTypeRef)(device->controller));

controller.controllerPausedHandler = nil;

device->controller = nil;

}

}

#endif /* SDL_JOYSTICK_MFI */

--numjoysticks;

SDL_free(device->name);

SDL_free(device);

return next;

}

/* Function to scan the system for joysticks.

* Joystick 0 should be the system default joystick.

* It should return 0, or -1 on an unrecoverable fatal error.

*/

int

SDL_SYS_JoystickInit(void)

{

@autoreleasepool {

NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

const char *hint = SDL_GetHint(SDL_HINT_ACCELEROMETER_AS_JOYSTICK);

if (!hint || SDL_atoi(hint)) {

/* Default behavior, accelerometer as joystick */

SDL_SYS_AddJoystickDevice(nil, SDL_TRUE);

}

#ifdef SDL_JOYSTICK_MFI

/* GameController.framework was added in iOS 7. */

if (![GCController class]) {

return numjoysticks;

}

for (GCController *controller in [GCController controllers]) {

SDL_SYS_AddJoystickDevice(controller, SDL_FALSE);

}

connectObserver = [center addObserverForName:GCControllerDidConnectNotification

object:nil

queue:nil

usingBlock:^(NSNotification *note) {

GCController *controller = note.object;

SDL_SYS_AddJoystickDevice(controller, SDL_FALSE);

}];

disconnectObserver = [center addObserverForName:GCControllerDidDisconnectNotification

object:nil

queue:nil

usingBlock:^(NSNotification *note) {

GCController *controller = note.object;

SDL_JoystickDeviceItem *device = deviceList;

while (device != NULL) {

if (device->controller == controller) {

SDL_SYS_RemoveJoystickDevice(device);

break;

}

device = device->next;

}

}];

#endif /* SDL_JOYSTICK_MFI */

}

return numjoysticks;

}

int SDL_SYS_NumJoysticks()

{

return numjoysticks;

}

void SDL_SYS_JoystickDetect()

{

}

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

const char *

SDL_SYS_JoystickNameForDeviceIndex(int device_index)

{

SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);

return device ? device->name : "Unknown";

}

/* Function to perform the mapping from device index to the instance id for this index */

SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)

{

SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);

return device ? device->instance_id : 0;

}

/* Function to open a joystick for use.

The joystick to open is specified by the device index.

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, int device_index)

{

SDL_JoystickDeviceItem *device = GetDeviceForIndex(device_index);

if (device == NULL) {

return SDL_SetError("Could not open Joystick: no hardware device for the specified index");

}

joystick->hwdata = device;

joystick->instance_id = device->instance_id;

joystick->naxes = device->naxes;

joystick->nhats = device->nhats;

joystick->nbuttons = device->nbuttons;

device->joystick = joystick;

@autoreleasepool {

if (device->accelerometer) {

if (motionManager == nil) {

motionManager = [[CMMotionManager alloc] init];

}

/* Shorter times between updates can significantly increase CPU usage. */

motionManager.accelerometerUpdateInterval = 0.1;

[motionManager startAccelerometerUpdates];

} else {

#ifdef SDL_JOYSTICK_MFI

GCController *controller = device->controller;

if (joystick->hwdata) {

++joystick->hwdata->num_pause_presses;

}

};

#endif /* SDL_JOYSTICK_MFI */

}

}

return 0;

}

/* Function to determine if this joystick is attached to the system right now */

SDL_bool

SDL_SYS_JoystickAttached(SDL_Joystick *joystick)

}

static void

SDL_SYS_AccelerometerUpdate(SDL_Joystick * joystick)

{

const float maxgforce = SDL_IPHONE_MAX_GFORCE;

const SInt16 maxsint16 = 0x7FFF;

CMAcceleration accel;

@autoreleasepool {

return;

}

accel = motionManager.accelerometerData.acceleration;

}

/*

Convert accelerometer data from floating point to Sint16, which is what

the joystick system expects.

To do the conversion, the data is first clamped onto the interval

[-SDL_IPHONE_MAX_G_FORCE, SDL_IPHONE_MAX_G_FORCE], then the data is multiplied

by MAX_SINT16 so that it is mapped to the full range of an Sint16.

You can customize the clamped range of this function by modifying the

SDL_IPHONE_MAX_GFORCE macro in SDL_config_iphoneos.h.

Once converted to Sint16, the accelerometer data no longer has coherent

units. You can convert the data back to units of g-force by multiplying

it in your application's code by SDL_IPHONE_MAX_GFORCE / 0x7FFF.

*/

/* clamp the data */

accel.x = SDL_min(SDL_max(accel.x, -maxgforce), maxgforce);

accel.y = SDL_min(SDL_max(accel.y, -maxgforce), maxgforce);

accel.z = SDL_min(SDL_max(accel.z, -maxgforce), maxgforce);

/* pass in data mapped to range of SInt16 */

SDL_PrivateJoystickAxis(joystick, 2, (accel.z / maxgforce) * maxsint16);

}

#ifdef SDL_JOYSTICK_MFI

static Uint8

SDL_SYS_MFIJoystickHatStateForDPad(GCControllerDirectionPad *dpad)

{

Uint8 hat = 0;

if (dpad.up.isPressed) {

hat |= SDL_HAT_UP;

} else if (dpad.down.isPressed) {

hat |= SDL_HAT_DOWN;

}

if (dpad.left.isPressed) {

hat |= SDL_HAT_LEFT;

} else if (dpad.right.isPressed) {

hat |= SDL_HAT_RIGHT;

}

if (hat == 0) {

return SDL_HAT_CENTERED;

}

return hat;

}

#endif

static void

SDL_SYS_MFIJoystickUpdate(SDL_Joystick * joystick)

{

#ifdef SDL_JOYSTICK_MFI

@autoreleasepool {

GCController *controller = joystick->hwdata->controller;

Uint8 hatstate = SDL_HAT_CENTERED;

int i;

if (controller.extendedGamepad) {

GCExtendedGamepad *gamepad = controller.extendedGamepad;

/* Axis order matches the XInput Windows mappings. */

Sint16 axes[] = {

(Sint16) (gamepad.leftThumbstick.xAxis.value * 32767),

(Sint16) (gamepad.leftThumbstick.yAxis.value * -32767),

(Sint16) ((gamepad.leftTrigger.value * 65535) - 32768),

(Sint16) (gamepad.rightThumbstick.xAxis.value * 32767),

(Sint16) (gamepad.rightThumbstick.yAxis.value * -32767),

(Sint16) ((gamepad.rightTrigger.value * 65535) - 32768),

};

/* Button order matches the XInput Windows mappings. */

Uint8 buttons[] = {

gamepad.buttonA.isPressed, gamepad.buttonB.isPressed,

gamepad.buttonX.isPressed, gamepad.buttonY.isPressed,

gamepad.leftShoulder.isPressed,

gamepad.rightShoulder.isPressed,

};

hatstate = SDL_SYS_MFIJoystickHatStateForDPad(gamepad.dpad);

for (i = 0; i < SDL_arraysize(axes); i++) {

/* The triggers (axes 2 and 5) are resting at -32768 but SDL

* initializes its values to 0. We only want to make sure the

* player index is up to date if the user actually moves an axis. */

if ((i != 2 && i != 5) || axes[i] != -32768) {

updateplayerindex |= (joystick->axes[i] != axes[i]);

}

SDL_PrivateJoystickAxis(joystick, i, axes[i]);

}

for (i = 0; i < SDL_arraysize(buttons); i++) {

updateplayerindex |= (joystick->buttons[i] != buttons[i]);

SDL_PrivateJoystickButton(joystick, i, buttons[i]);

}

} else if (controller.gamepad) {

GCGamepad *gamepad = controller.gamepad;

/* Button order matches the XInput Windows mappings. */

Uint8 buttons[] = {

gamepad.buttonA.isPressed, gamepad.buttonB.isPressed,

gamepad.buttonX.isPressed, gamepad.buttonY.isPressed,

gamepad.leftShoulder.isPressed,

gamepad.rightShoulder.isPressed,

};

hatstate = SDL_SYS_MFIJoystickHatStateForDPad(gamepad.dpad);

for (i = 0; i < SDL_arraysize(buttons); i++) {

updateplayerindex |= (joystick->buttons[i] != buttons[i]);

SDL_PrivateJoystickButton(joystick, i, buttons[i]);

}

}

/* TODO: Handle micro profiles on tvOS. */

if (joystick->nhats > 0) {

updateplayerindex |= (joystick->hats[0] != hatstate);

SDL_PrivateJoystickHat(joystick, 0, hatstate);

}

for (i = 0; i < joystick->hwdata->num_pause_presses; i++) {

/* The pause button is always last. */

Uint8 pausebutton = joystick->nbuttons - 1;

SDL_PrivateJoystickButton(joystick, pausebutton, SDL_PRESSED);

SDL_PrivateJoystickButton(joystick, pausebutton, SDL_RELEASED);

updateplayerindex = YES;

}

joystick->hwdata->num_pause_presses = 0;

if (updateplayerindex && controller.playerIndex == -1) {

BOOL usedPlayerIndexSlots[4] = {NO, NO, NO, NO};

/* Find the player index of all other connected controllers. */

for (GCController *c in [GCController controllers]) {

if (c != controller && c.playerIndex >= 0) {

usedPlayerIndexSlots[c.playerIndex] = YES;

}

}

/* Set this controller's player index to the first unused index.

* FIXME: This logic isn't great... but SDL doesn't expose this

* concept in its external API, so we don't have much to go on. */

for (i = 0; i < SDL_arraysize(usedPlayerIndexSlots); i++) {

if (!usedPlayerIndexSlots[i]) {

controller.playerIndex = i;

break;

}

}

}

}

#endif

}

/* 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)

{

SDL_JoystickDeviceItem *device = joystick->hwdata;

if (device == NULL) {

return;

}

if (device->accelerometer) {

SDL_SYS_AccelerometerUpdate(joystick);

} else if (device->controller) {

SDL_SYS_MFIJoystickUpdate(joystick);

}

}

/* Function to close a joystick after use */

void

SDL_SYS_JoystickClose(SDL_Joystick * joystick)

{

SDL_JoystickDeviceItem *device = joystick->hwdata;

if (device == NULL) {

return;

}

device->joystick = NULL;

if (device->accelerometer) {

[motionManager stopAccelerometerUpdates];

} else if (device->controller) {

#ifdef SDL_JOYSTICK_MFI

GCController *controller = device->controller;

controller.controllerPausedHandler = nil;

#endif

}

}

}

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

void

SDL_SYS_JoystickQuit(void)

{

@autoreleasepool {

#ifdef SDL_JOYSTICK_MFI

NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

if (connectObserver) {

[center removeObserver:connectObserver name:GCControllerDidConnectNotification object:nil];

connectObserver = nil;

}

if (disconnectObserver) {

[center removeObserver:disconnectObserver name:GCControllerDidDisconnectNotification object:nil];

disconnectObserver = nil;

}

#endif /* SDL_JOYSTICK_MFI */

while (deviceList != NULL) {

SDL_SYS_RemoveJoystickDevice(deviceList);

}

motionManager = nil;

}

numjoysticks = 0;

}

SDL_JoystickGUID

SDL_SYS_JoystickGetDeviceGUID( int device_index )

if (device) {

guid = device->guid;

} else {

SDL_zero(guid);

}

return guid;

}

SDL_JoystickGUID

SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)

{

SDL_JoystickGUID guid;

if (joystick->hwdata) {

guid = joystick->hwdata->guid;

} else {

SDL_zero(guid);

}

return guid;

}

/* vi: set ts=4 sw=4 expandtab: */