SDL/src/joystick/gdk/SDL_gameinputjoystick.cpp

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>

  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"

#ifdef SDL_JOYSTICK_GAMEINPUT

#include "../SDL_sysjoystick.h"
#include "../usb_ids.h"
#include "../../core/windows/SDL_windows.h"
#include "../../core/windows/SDL_gameinput.h"

// Default value for SDL_HINT_JOYSTICK_GAMEINPUT
#if defined(SDL_PLATFORM_GDK)
#define SDL_GAMEINPUT_DEFAULT true
#else
#define SDL_GAMEINPUT_DEFAULT false
#endif

enum
{
    SDL_GAMEPAD_BUTTON_GAMEINPUT_SHARE = 11
};

typedef struct GAMEINPUT_InternalDevice
{
    IGameInputDevice *device;
    char path[(APP_LOCAL_DEVICE_ID_SIZE * 2) + 1];
    char *name;
    SDL_GUID guid;          // generated by SDL
    SDL_JoystickID device_instance; // generated by SDL
    const GameInputDeviceInfo *info;
    bool isAdded;
    bool isDeleteRequested;
} GAMEINPUT_InternalDevice;

typedef struct GAMEINPUT_InternalList
{
    GAMEINPUT_InternalDevice **devices;
    int count;
} GAMEINPUT_InternalList;

typedef struct joystick_hwdata
{
    GAMEINPUT_InternalDevice *devref;
    bool report_sensors;
    GameInputRumbleParams rumbleParams;
    GameInputCallbackToken system_button_callback_token;
} GAMEINPUT_InternalJoystickHwdata;

static GAMEINPUT_InternalList g_GameInputList = { NULL };
static IGameInput *g_pGameInput = NULL;
static GameInputCallbackToken g_GameInputCallbackToken = 0;
static Uint64 g_GameInputTimestampOffset;

static bool GAMEINPUT_InternalIsGamepad(const GameInputDeviceInfo *info)
{
    if (info->supportedInput & GameInputKindGamepad) {
        return true;
    }
    return false;
}

static bool GAMEINPUT_InternalAddOrFind(IGameInputDevice *pDevice)
{
    GAMEINPUT_InternalDevice **devicelist = NULL;
    GAMEINPUT_InternalDevice *elem = NULL;
    const GameInputDeviceInfo *info = NULL;
    Uint16 bus = SDL_HARDWARE_BUS_USB;
    Uint16 vendor = 0;
    Uint16 product = 0;
    Uint16 version = 0;
    const char *manufacturer_string = NULL;
    const char *product_string = NULL;
    char tmp[4];
    int idx = 0;

    SDL_AssertJoysticksLocked();

#if GAMEINPUT_API_VERSION >= 1
    HRESULT hr = pDevice->GetDeviceInfo(&info);
    if (FAILED(hr)) {
        return WIN_SetErrorFromHRESULT("IGameInputDevice::GetDeviceInfo", hr);
    }
#else
    info = pDevice->GetDeviceInfo();
#endif
    if (false /*info->capabilities & GameInputDeviceCapabilityWireless*/) {
        bus = SDL_HARDWARE_BUS_BLUETOOTH;
    } else {
        bus = SDL_HARDWARE_BUS_USB;
    }
    vendor = info->vendorId;
    product = info->productId;
    //version = (info->firmwareVersion.major << 8) | info->firmwareVersion.minor;

    if (SDL_JoystickHandledByAnotherDriver(&SDL_GAMEINPUT_JoystickDriver, vendor, product, version, "")) {
        return true;
    }

    for (idx = 0; idx < g_GameInputList.count; ++idx) {
        elem = g_GameInputList.devices[idx];
        if (elem && elem->device == pDevice) {
            // we're already added
            elem->isDeleteRequested = false;
            return true;
        }
    }

    elem = (GAMEINPUT_InternalDevice *)SDL_calloc(1, sizeof(*elem));
    if (!elem) {
        return false;
    }

    devicelist = (GAMEINPUT_InternalDevice **)SDL_realloc(g_GameInputList.devices, sizeof(elem) * (g_GameInputList.count + 1LL));
    if (!devicelist) {
        SDL_free(elem);
        return false;
    }

    // Generate a device path
    for (idx = 0; idx < APP_LOCAL_DEVICE_ID_SIZE; ++idx) {
        SDL_snprintf(tmp, SDL_arraysize(tmp), "%02hhX", info->deviceId.value[idx]);
        SDL_strlcat(elem->path, tmp, SDL_arraysize(elem->path));
    }

#if GAMEINPUT_API_VERSION >= 1
    if (info->displayName) {
        product_string = info->displayName;
    }
#else
    if (info->displayName) {
        product_string = info->displayName->data;
    }
#endif

    pDevice->AddRef();
    elem->device = pDevice;
    elem->name = SDL_CreateJoystickName(vendor, product, manufacturer_string, product_string);
    elem->guid = SDL_CreateJoystickGUID(bus, vendor, product, version, manufacturer_string, product_string, 'g', 0);
    elem->device_instance = SDL_GetNextObjectID();
    elem->info = info;

    g_GameInputList.devices = devicelist;
    g_GameInputList.devices[g_GameInputList.count++] = elem;

    return true;
}

static bool GAMEINPUT_InternalRemoveByIndex(int idx)
{
    GAMEINPUT_InternalDevice **devicelist = NULL;
    GAMEINPUT_InternalDevice *elem;
    int bytes = 0;

    SDL_AssertJoysticksLocked();

    if (idx < 0 || idx >= g_GameInputList.count) {
        return SDL_SetError("GAMEINPUT_InternalRemoveByIndex argument idx %d is out of range", idx);
    }

    elem = g_GameInputList.devices[idx];
    if (elem) {
        elem->device->Release();
        SDL_free(elem->name);
        SDL_free(elem);
    }
    g_GameInputList.devices[idx] = NULL;

    if (g_GameInputList.count == 1) {
        // last element in the list, free the entire list then
        SDL_free(g_GameInputList.devices);
        g_GameInputList.devices = NULL;
    } else {
        if (idx != g_GameInputList.count - 1) {
            bytes = sizeof(*devicelist) * (g_GameInputList.count - idx);
            SDL_memmove(&g_GameInputList.devices[idx], &g_GameInputList.devices[idx + 1], bytes);
        }
    }

    // decrement the count and return
    --g_GameInputList.count;
    return true;
}

static GAMEINPUT_InternalDevice *GAMEINPUT_InternalFindByIndex(int idx)
{
    // We're guaranteed that the index is in range when this is called
    SDL_AssertJoysticksLocked();
    return g_GameInputList.devices[idx];
}

static void CALLBACK GAMEINPUT_InternalJoystickDeviceCallback(
    _In_ GameInputCallbackToken callbackToken,
    _In_ void *context,
    _In_ IGameInputDevice *device,
    _In_ uint64_t timestamp,
    _In_ GameInputDeviceStatus currentStatus,
    _In_ GameInputDeviceStatus previousStatus)
{
    int idx = 0;
    GAMEINPUT_InternalDevice *elem = NULL;

    if (!device) {
        // This should never happen, but ignore it if it does
        return;
    }

    SDL_LockJoysticks();

    if (currentStatus & GameInputDeviceConnected) {
        GAMEINPUT_InternalAddOrFind(device);
    } else {
        for (idx = 0; idx < g_GameInputList.count; ++idx) {
            elem = g_GameInputList.devices[idx];
            if (elem && elem->device == device) {
                // will be deleted on the next Detect call
                elem->isDeleteRequested = true;
                break;
            }
        }
    }

    SDL_UnlockJoysticks();
}

static void GAMEINPUT_JoystickDetect(void);
static void GAMEINPUT_JoystickQuit(void);

static bool GAMEINPUT_JoystickInit(void)
{
    HRESULT hr;

    if (!SDL_GetHintBoolean(SDL_HINT_JOYSTICK_GAMEINPUT, SDL_GAMEINPUT_DEFAULT)) {
        return true;
    }

    if (!SDL_InitGameInput(&g_pGameInput)) {
        return false;
    }

    hr = g_pGameInput->RegisterDeviceCallback(NULL,
                                           GameInputKindController,
                                           GameInputDeviceConnected,
                                           GameInputBlockingEnumeration,
                                           NULL,
                                           GAMEINPUT_InternalJoystickDeviceCallback,
                                           &g_GameInputCallbackToken);
    if (FAILED(hr)) {
        GAMEINPUT_JoystickQuit();
        return WIN_SetErrorFromHRESULT("IGameInput::RegisterDeviceCallback", hr);
    }

    // Calculate the relative offset between SDL timestamps and GameInput timestamps
    Uint64 now = SDL_GetTicksNS();
    uint64_t timestampUS = g_pGameInput->GetCurrentTimestamp();
    g_GameInputTimestampOffset = (SDL_NS_TO_US(now) - timestampUS);

    GAMEINPUT_JoystickDetect();

    return true;
}

static int GAMEINPUT_JoystickGetCount(void)
{
    SDL_AssertJoysticksLocked();

    return g_GameInputList.count;
}

static void GAMEINPUT_JoystickDetect(void)
{
    int idx;
    GAMEINPUT_InternalDevice *elem = NULL;

    SDL_AssertJoysticksLocked();

    for (idx = 0; idx < g_GameInputList.count; ++idx) {
        elem = g_GameInputList.devices[idx];
        if (!elem) {
            continue;
        }

        if (!elem->isAdded) {
            SDL_PrivateJoystickAdded(elem->device_instance);
            elem->isAdded = true;
        }

        if (elem->isDeleteRequested || !(elem->device->GetDeviceStatus() & GameInputDeviceConnected)) {
            SDL_PrivateJoystickRemoved(elem->device_instance);
            GAMEINPUT_InternalRemoveByIndex(idx--);
        }
    }
}

static bool GAMEINPUT_JoystickIsDevicePresent(Uint16 vendor_id, Uint16 product_id, Uint16 version, const char *name)
{
    SDL_AssertJoysticksLocked();

    if (g_pGameInput) {
        if (vendor_id == USB_VENDOR_MICROSOFT &&
            product_id == USB_PRODUCT_XBOX_ONE_XBOXGIP_CONTROLLER) {
            // The Xbox One controller shows up as a hardcoded raw input VID/PID, which we definitely handle
            return true;
        }

        for (int i = 0; i < g_GameInputList.count; ++i) {
            GAMEINPUT_InternalDevice *elem = g_GameInputList.devices[i];
            if (elem && vendor_id == elem->info->vendorId && product_id == elem->info->productId) {
                return true;
            }
        }
    }
    return false;
}

static const char *GAMEINPUT_JoystickGetDeviceName(int device_index)
{
    return GAMEINPUT_InternalFindByIndex(device_index)->name;
}

static const char *GAMEINPUT_JoystickGetDevicePath(int device_index)
{
    // APP_LOCAL_DEVICE_ID as a hex string, since it's required for some association callbacks
    return GAMEINPUT_InternalFindByIndex(device_index)->path;
}

static int GAMEINPUT_JoystickGetDeviceSteamVirtualGamepadSlot(int device_index)
{
    return -1;
}

static int GAMEINPUT_JoystickGetDevicePlayerIndex(int device_index)
{
    return -1;
}

static void GAMEINPUT_JoystickSetDevicePlayerIndex(int device_index, int player_index)
{
}

static SDL_GUID GAMEINPUT_JoystickGetDeviceGUID(int device_index)
{
    return GAMEINPUT_InternalFindByIndex(device_index)->guid;
}

static SDL_JoystickID GAMEINPUT_JoystickGetDeviceInstanceID(int device_index)
{
    return GAMEINPUT_InternalFindByIndex(device_index)->device_instance;
}

static void GAMEINPUT_UpdatePowerInfo(SDL_Joystick *joystick, IGameInputDevice *device)
{
#if 0
    GameInputBatteryState battery_state;
    SDL_PowerState state;
    int percent = 0;

    SDL_zero(battery_state);
    IGameInputDevice_GetBatteryState(device, &battery_state);

    switch (battery_state.status) {
    case GameInputBatteryNotPresent:
        state = SDL_POWERSTATE_NO_BATTERY;
        break;
    case GameInputBatteryDischarging:
        state = SDL_POWERSTATE_ON_BATTERY;
        break;
    case GameInputBatteryIdle:
        state = SDL_POWERSTATE_CHARGED;
        break;
    case GameInputBatteryCharging:
        state = SDL_POWERSTATE_CHARGING;
        break;
    default:
        state = SDL_POWERSTATE_UNKNOWN;
        break;
    }
    if (battery_state.fullChargeCapacity > 0.0f) {
        percent = (int)SDL_roundf((battery_state.remainingCapacity / battery_state.fullChargeCapacity) * 100.0f);
    }
    SDL_SendJoystickPowerInfo(joystick, state, percent);
#endif
}

#if GAMEINPUT_API_VERSION >= 1
static void CALLBACK GAMEINPUT_InternalSystemButtonCallback(
    _In_ GameInputCallbackToken callbackToken,
    _In_ void * context,
    _In_ IGameInputDevice * device,
    _In_ uint64_t timestampUS,
    _In_ GameInputSystemButtons currentButtons,
    _In_ GameInputSystemButtons previousButtons)
{
    SDL_Joystick *joystick = (SDL_Joystick *)context;

    GameInputSystemButtons changedButtons = (previousButtons ^ currentButtons);
    if (changedButtons) {
        Uint64 timestamp = SDL_US_TO_NS(timestampUS + g_GameInputTimestampOffset);

        SDL_LockJoysticks();
        if (changedButtons & GameInputSystemButtonGuide) {
            bool down = ((currentButtons & GameInputSystemButtonGuide) != 0);
            SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_GUIDE, down);
        }
        if (changedButtons & GameInputSystemButtonShare) {
            bool down = ((currentButtons & GameInputSystemButtonShare) != 0);
            SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_GAMEINPUT_SHARE, down);
        }
        SDL_UnlockJoysticks();
    }
}
#endif // GAMEINPUT_API_VERSION >= 1

static bool GAMEINPUT_JoystickOpen(SDL_Joystick *joystick, int device_index)
{
    GAMEINPUT_InternalDevice *elem = GAMEINPUT_InternalFindByIndex(device_index);
    const GameInputDeviceInfo *info = elem->info;
    GAMEINPUT_InternalJoystickHwdata *hwdata = NULL;

    if (!elem) {
        return false;
    }

    hwdata = (GAMEINPUT_InternalJoystickHwdata *)SDL_calloc(1, sizeof(*hwdata));
    if (!hwdata) {
        return false;
    }

    hwdata->devref = elem;

    joystick->hwdata = hwdata;
    if (GAMEINPUT_InternalIsGamepad(info)) {
        joystick->naxes = 6;
        joystick->nbuttons = 11;
        joystick->nhats = 1;

#if GAMEINPUT_API_VERSION >= 1
        if (info->supportedSystemButtons != GameInputSystemButtonNone) {
            if (info->supportedSystemButtons & GameInputSystemButtonShare) {
                ++joystick->nbuttons;
            }

            g_pGameInput->RegisterSystemButtonCallback(elem->device, (GameInputSystemButtonGuide | GameInputSystemButtonShare), joystick, GAMEINPUT_InternalSystemButtonCallback, &hwdata->system_button_callback_token);
        }
#endif // GAMEINPUT_API_VERSION >= 1
    } else {
        joystick->naxes = info->controllerAxisCount;
        joystick->nbuttons = info->controllerButtonCount;
        joystick->nhats = info->controllerSwitchCount;
    }

    if (info->supportedRumbleMotors & (GameInputRumbleLowFrequency | GameInputRumbleHighFrequency)) {
        SDL_SetBooleanProperty(SDL_GetJoystickProperties(joystick), SDL_PROP_JOYSTICK_CAP_RUMBLE_BOOLEAN, true);
    }
    if (info->supportedRumbleMotors & (GameInputRumbleLeftTrigger | GameInputRumbleRightTrigger)) {
        SDL_SetBooleanProperty(SDL_GetJoystickProperties(joystick), SDL_PROP_JOYSTICK_CAP_TRIGGER_RUMBLE_BOOLEAN, true);
    }

#if 0
    if (info->supportedInput & GameInputKindTouch) {
        SDL_PrivateJoystickAddTouchpad(joystick, info->touchPointCount);
    }

    if (info->supportedInput & GameInputKindMotion) {
        // FIXME: What's the sensor update rate?
        SDL_PrivateJoystickAddSensor(joystick, SDL_SENSOR_GYRO, 250.0f);
        SDL_PrivateJoystickAddSensor(joystick, SDL_SENSOR_ACCEL, 250.0f);
    }

    if (info->capabilities & GameInputDeviceCapabilityWireless) {
        joystick->connection_state = SDL_JOYSTICK_CONNECTION_WIRELESS;
    } else {
        joystick->connection_state = SDL_JOYSTICK_CONNECTION_WIRED;
    }
#endif
    return true;
}

static bool GAMEINPUT_JoystickRumble(SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble)
{
    // don't check for caps here, since SetRumbleState doesn't return any result - we don't need to check it
    GAMEINPUT_InternalJoystickHwdata *hwdata = joystick->hwdata;
    GameInputRumbleParams *params = &hwdata->rumbleParams;
    params->lowFrequency = (float)low_frequency_rumble / (float)SDL_MAX_UINT16;
    params->highFrequency = (float)high_frequency_rumble / (float)SDL_MAX_UINT16;
    hwdata->devref->device->SetRumbleState(params);
    return true;
}

static bool GAMEINPUT_JoystickRumbleTriggers(SDL_Joystick *joystick, Uint16 left_rumble, Uint16 right_rumble)
{
    // don't check for caps here, since SetRumbleState doesn't return any result - we don't need to check it
    GAMEINPUT_InternalJoystickHwdata *hwdata = joystick->hwdata;
    GameInputRumbleParams *params = &hwdata->rumbleParams;
    params->leftTrigger = (float)left_rumble / (float)SDL_MAX_UINT16;
    params->rightTrigger = (float)right_rumble / (float)SDL_MAX_UINT16;
    hwdata->devref->device->SetRumbleState(params);
    return true;
}

static bool GAMEINPUT_JoystickSetLED(SDL_Joystick *joystick, Uint8 red, Uint8 green, Uint8 blue)
{
    return SDL_Unsupported();
}

static bool GAMEINPUT_JoystickSendEffect(SDL_Joystick *joystick, const void *data, int size)
{
    return SDL_Unsupported();
}

static bool GAMEINPUT_JoystickSetSensorsEnabled(SDL_Joystick *joystick, bool enabled)
{
    joystick->hwdata->report_sensors = enabled;
    return true;
}

static void GAMEINPUT_JoystickUpdate(SDL_Joystick *joystick)
{
    GAMEINPUT_InternalJoystickHwdata *hwdata = joystick->hwdata;
    IGameInputDevice *device = hwdata->devref->device;
    const GameInputDeviceInfo *info = hwdata->devref->info;
    IGameInputReading *reading = NULL;
    Uint64 timestamp;
    GameInputGamepadState state;
    HRESULT hr;

    hr = g_pGameInput->GetCurrentReading(info->supportedInput, device, &reading);
    if (FAILED(hr)) {
        // don't SetError here since there can be a legitimate case when there's no reading avail
        return;
    }

    timestamp = SDL_US_TO_NS(reading->GetTimestamp() + g_GameInputTimestampOffset);

    if (GAMEINPUT_InternalIsGamepad(info)) {
        static WORD s_XInputButtons[] = {
            GameInputGamepadA,               // SDL_GAMEPAD_BUTTON_SOUTH
            GameInputGamepadB,               // SDL_GAMEPAD_BUTTON_EAST
            GameInputGamepadX,               // SDL_GAMEPAD_BUTTON_WEST
            GameInputGamepadY,               // SDL_GAMEPAD_BUTTON_NORTH
            GameInputGamepadView,            // SDL_GAMEPAD_BUTTON_BACK
            0,                               // The guide button is not available
            GameInputGamepadMenu,            // SDL_GAMEPAD_BUTTON_START
            GameInputGamepadLeftThumbstick,  // SDL_GAMEPAD_BUTTON_LEFT_STICK
            GameInputGamepadRightThumbstick, // SDL_GAMEPAD_BUTTON_RIGHT_STICK
            GameInputGamepadLeftShoulder,    // SDL_GAMEPAD_BUTTON_LEFT_SHOULDER
            GameInputGamepadRightShoulder,   // SDL_GAMEPAD_BUTTON_RIGHT_SHOULDER
        };
        Uint8 btnidx = 0, hat = 0;

        if (reading->GetGamepadState(&state)) {
            for (btnidx = 0; btnidx < SDL_arraysize(s_XInputButtons); ++btnidx) {
                WORD button_mask = s_XInputButtons[btnidx];
                if (!button_mask) {
                    continue;
                }
                bool down = ((state.buttons & button_mask) != 0);
                SDL_SendJoystickButton(timestamp, joystick, btnidx, down);
            }

            if (state.buttons & GameInputGamepadDPadUp) {
                hat |= SDL_HAT_UP;
            }
            if (state.buttons & GameInputGamepadDPadDown) {
                hat |= SDL_HAT_DOWN;
            }
            if (state.buttons & GameInputGamepadDPadLeft) {
                hat |= SDL_HAT_LEFT;
            }
            if (state.buttons & GameInputGamepadDPadRight) {
                hat |= SDL_HAT_RIGHT;
            }
            SDL_SendJoystickHat(timestamp, joystick, 0, hat);

#define CONVERT_AXIS(v) (Sint16)(((v) < 0.0f) ? ((v)*32768.0f) : ((v)*32767.0f))
            SDL_SendJoystickAxis(timestamp, joystick, SDL_GAMEPAD_AXIS_LEFTX, CONVERT_AXIS(state.leftThumbstickX));
            SDL_SendJoystickAxis(timestamp, joystick, SDL_GAMEPAD_AXIS_LEFTY, CONVERT_AXIS(-state.leftThumbstickY));
            SDL_SendJoystickAxis(timestamp, joystick, SDL_GAMEPAD_AXIS_RIGHTX, CONVERT_AXIS(state.rightThumbstickX));
            SDL_SendJoystickAxis(timestamp, joystick, SDL_GAMEPAD_AXIS_RIGHTY, CONVERT_AXIS(-state.rightThumbstickY));
#undef CONVERT_AXIS
#define CONVERT_TRIGGER(v) (Sint16)((v)*65535.0f - 32768.0f)
            SDL_SendJoystickAxis(timestamp, joystick, SDL_GAMEPAD_AXIS_LEFT_TRIGGER, CONVERT_TRIGGER(state.leftTrigger));
            SDL_SendJoystickAxis(timestamp, joystick, SDL_GAMEPAD_AXIS_RIGHT_TRIGGER, CONVERT_TRIGGER(state.rightTrigger));
#undef CONVERT_TRIGGER
        }
    } else {
        bool *button_state = SDL_stack_alloc(bool, info->controllerButtonCount);
        float *axis_state = SDL_stack_alloc(float, info->controllerAxisCount);
        GameInputSwitchPosition *switch_state = SDL_stack_alloc(GameInputSwitchPosition, info->controllerSwitchCount);

        if (button_state) {
            uint32_t i;
            uint32_t button_count = reading->GetControllerButtonState(info->controllerButtonCount, button_state);
            for (i = 0; i < button_count; ++i) {
                SDL_SendJoystickButton(timestamp, joystick, (Uint8)i, button_state[i]);
            }
            SDL_stack_free(button_state);
        }

#define CONVERT_AXIS(v) (Sint16)((v)*65535.0f - 32768.0f)
        if (axis_state) {
            uint32_t i;
            uint32_t axis_count = reading->GetControllerAxisState(info->controllerAxisCount, axis_state);
            for (i = 0; i < axis_count; ++i) {
                SDL_SendJoystickAxis(timestamp, joystick, (Uint8)i, CONVERT_AXIS(axis_state[i]));
            }
            SDL_stack_free(axis_state);
        }
#undef CONVERT_AXIS

        if (switch_state) {
            uint32_t i;
            uint32_t switch_count = reading->GetControllerSwitchState(info->controllerSwitchCount, switch_state);
            for (i = 0; i < switch_count; ++i) {
                Uint8 hat;
                switch (switch_state[i]) {
                case GameInputSwitchUp:
                    hat = SDL_HAT_UP;
                    break;
                case GameInputSwitchUpRight:
                    hat = SDL_HAT_UP | SDL_HAT_RIGHT;
                    break;
                case GameInputSwitchRight:
                    hat = SDL_HAT_RIGHT;
                    break;
                case GameInputSwitchDownRight:
                    hat = SDL_HAT_DOWN | SDL_HAT_RIGHT;
                    break;
                case GameInputSwitchDown:
                    hat = SDL_HAT_DOWN;
                    break;
                case GameInputSwitchDownLeft:
                    hat = SDL_HAT_DOWN | SDL_HAT_LEFT;
                    break;
                case GameInputSwitchLeft:
                    hat = SDL_HAT_LEFT;
                    break;
                case GameInputSwitchUpLeft:
                    hat = SDL_HAT_UP | SDL_HAT_LEFT;
                    break;
                case GameInputSwitchCenter:
                default:
                    hat = SDL_HAT_CENTERED;
                    break;
                }
                SDL_SendJoystickHat(timestamp, joystick, (Uint8)i, hat);
            }
            SDL_stack_free(switch_state);
        }
    }

#if 0
    if (info->supportedInput & GameInputKindTouch) {
        GameInputTouchState *touch_state = SDL_stack_alloc(GameInputTouchState, info->touchPointCount);
        if (touch_state) {
            uint32_t i;
            uint32_t touch_count = IGameInputReading_GetTouchState(reading, info->touchPointCount, touch_state);
            for (i = 0; i < touch_count; ++i) {
                GameInputTouchState *touch = &touch_state[i];
                // FIXME: We should use touch->touchId to track fingers instead of using i below
                SDL_SendJoystickTouchpad(timestamp, joystick, 0, i, true, touch->positionX * info->touchSensorInfo[i].resolutionX, touch->positionY * info->touchSensorInfo[0].resolutionY, touch->pressure);
            }
            SDL_stack_free(touch_state);
        }
    }

    if (hwdata->report_sensors) {
        GameInputMotionState motion_state;

        if (IGameInputReading_GetMotionState(reading, &motion_state)) {
            // FIXME: How do we interpret the motion data?
        }
    }
#endif

    reading->Release();

    // FIXME: We can poll this at a much lower rate
    GAMEINPUT_UpdatePowerInfo(joystick, device);
}

static void GAMEINPUT_JoystickClose(SDL_Joystick *joystick)
{
    GAMEINPUT_InternalJoystickHwdata *hwdata = joystick->hwdata;

    if (hwdata->system_button_callback_token) {
#if GAMEINPUT_API_VERSION >= 1
        g_pGameInput->UnregisterCallback(hwdata->system_button_callback_token);
#else
        g_pGameInput->UnregisterCallback(hwdata->system_button_callback_token, 10000);
#endif
    }
    SDL_free(hwdata);

    joystick->hwdata = NULL;
}

static void GAMEINPUT_JoystickQuit(void)
{
    if (g_pGameInput) {
        // free the callback
        if (g_GameInputCallbackToken) {
#if GAMEINPUT_API_VERSION >= 1
            g_pGameInput->UnregisterCallback(g_GameInputCallbackToken);
#else
            g_pGameInput->UnregisterCallback(g_GameInputCallbackToken, 10000);
#endif
            g_GameInputCallbackToken = 0;
        }

        // free the list
        while (g_GameInputList.count > 0) {
            GAMEINPUT_InternalRemoveByIndex(0);
        }

        SDL_QuitGameInput();
        g_pGameInput = NULL;
    }
}

static bool GAMEINPUT_JoystickGetGamepadMapping(int device_index, SDL_GamepadMapping *out)
{
    GAMEINPUT_InternalDevice *elem = GAMEINPUT_InternalFindByIndex(device_index);

    if (!GAMEINPUT_InternalIsGamepad(elem->info)) {
        return false;
    }

    out->a.kind = EMappingKind_Button;
    out->a.target = SDL_GAMEPAD_BUTTON_SOUTH;

    out->b.kind = EMappingKind_Button;
    out->b.target = SDL_GAMEPAD_BUTTON_EAST;

    out->x.kind = EMappingKind_Button;
    out->x.target = SDL_GAMEPAD_BUTTON_WEST;

    out->y.kind = EMappingKind_Button;
    out->y.target = SDL_GAMEPAD_BUTTON_NORTH;

    out->back.kind = EMappingKind_Button;
    out->back.target = SDL_GAMEPAD_BUTTON_BACK;

#if GAMEINPUT_API_VERSION >= 1
    if (elem->info->supportedSystemButtons & GameInputSystemButtonGuide) {
        out->guide.kind = EMappingKind_Button;
        out->guide.target = SDL_GAMEPAD_BUTTON_GUIDE;
    }

    if (elem->info->supportedSystemButtons & GameInputSystemButtonShare) {
        out->misc1.kind = EMappingKind_Button;
        out->misc1.target = SDL_GAMEPAD_BUTTON_GAMEINPUT_SHARE;
    }
#endif // GAMEINPUT_API_VERSION >= 1

    out->start.kind = EMappingKind_Button;
    out->start.target = SDL_GAMEPAD_BUTTON_START;

    out->leftstick.kind = EMappingKind_Button;
    out->leftstick.target = SDL_GAMEPAD_BUTTON_LEFT_STICK;

    out->rightstick.kind = EMappingKind_Button;
    out->rightstick.target = SDL_GAMEPAD_BUTTON_RIGHT_STICK;

    out->leftshoulder.kind = EMappingKind_Button;
    out->leftshoulder.target = SDL_GAMEPAD_BUTTON_LEFT_SHOULDER;

    out->rightshoulder.kind = EMappingKind_Button;
    out->rightshoulder.target = SDL_GAMEPAD_BUTTON_RIGHT_SHOULDER;

    out->dpup.kind = EMappingKind_Hat;
    out->dpup.target = SDL_HAT_UP;

    out->dpdown.kind = EMappingKind_Hat;
    out->dpdown.target = SDL_HAT_DOWN;

    out->dpleft.kind = EMappingKind_Hat;
    out->dpleft.target = SDL_HAT_LEFT;

    out->dpright.kind = EMappingKind_Hat;
    out->dpright.target = SDL_HAT_RIGHT;

    out->leftx.kind = EMappingKind_Axis;
    out->leftx.target = SDL_GAMEPAD_AXIS_LEFTX;

    out->lefty.kind = EMappingKind_Axis;
    out->lefty.target = SDL_GAMEPAD_AXIS_LEFTY;

    out->rightx.kind = EMappingKind_Axis;
    out->rightx.target = SDL_GAMEPAD_AXIS_RIGHTX;

    out->righty.kind = EMappingKind_Axis;
    out->righty.target = SDL_GAMEPAD_AXIS_RIGHTY;

    out->lefttrigger.kind = EMappingKind_Axis;
    out->lefttrigger.target = SDL_GAMEPAD_AXIS_LEFT_TRIGGER;

    out->righttrigger.kind = EMappingKind_Axis;
    out->righttrigger.target = SDL_GAMEPAD_AXIS_RIGHT_TRIGGER;

    return true;
}


SDL_JoystickDriver SDL_GAMEINPUT_JoystickDriver =
{
    GAMEINPUT_JoystickInit,
    GAMEINPUT_JoystickGetCount,
    GAMEINPUT_JoystickDetect,
    GAMEINPUT_JoystickIsDevicePresent,
    GAMEINPUT_JoystickGetDeviceName,
    GAMEINPUT_JoystickGetDevicePath,
    GAMEINPUT_JoystickGetDeviceSteamVirtualGamepadSlot,
    GAMEINPUT_JoystickGetDevicePlayerIndex,
    GAMEINPUT_JoystickSetDevicePlayerIndex,
    GAMEINPUT_JoystickGetDeviceGUID,
    GAMEINPUT_JoystickGetDeviceInstanceID,
    GAMEINPUT_JoystickOpen,
    GAMEINPUT_JoystickRumble,
    GAMEINPUT_JoystickRumbleTriggers,
    GAMEINPUT_JoystickSetLED,
    GAMEINPUT_JoystickSendEffect,
    GAMEINPUT_JoystickSetSensorsEnabled,
    GAMEINPUT_JoystickUpdate,
    GAMEINPUT_JoystickClose,
    GAMEINPUT_JoystickQuit,
    GAMEINPUT_JoystickGetGamepadMapping
};


#endif // SDL_JOYSTICK_GAMEINPUT