/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>

  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"

#include "../SDL_sysjoystick.h"

#ifdef SDL_JOYSTICK_DINPUT

#include "SDL_hints.h"
#include "SDL_timer.h"
#include "SDL_windowsjoystick_c.h"
#include "SDL_dinputjoystick_c.h"
#include "SDL_rawinputjoystick_c.h"
#include "SDL_xinputjoystick_c.h"
#include "../hidapi/SDL_hidapijoystick_c.h"

#ifndef DIDFT_OPTIONAL
#define DIDFT_OPTIONAL 0x80000000
#endif

#define INPUT_QSIZE        128                                                         /* Buffer up to 128 input messages */
#define JOY_AXIS_THRESHOLD (((SDL_JOYSTICK_AXIS_MAX) - (SDL_JOYSTICK_AXIS_MIN)) / 100) /* 1% motion */

#define CONVERT_MAGNITUDE(x) (((x)*10000) / 0x7FFF)

/* external variables referenced. */
#ifdef SDL_VIDEO_DRIVER_WINDOWS
extern HWND SDL_HelperWindow;
#else
static const HWND SDL_HelperWindow = NULL;
#endif

/* local variables */
static SDL_bool coinitialized = SDL_FALSE;
static LPDIRECTINPUT8 dinput = NULL;

/* Taken from Wine - Thanks! */
static DIOBJECTDATAFORMAT dfDIJoystick2[] = {
    { &GUID_XAxis, DIJOFS_X, DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTPOSITION },
    { &GUID_YAxis, DIJOFS_Y, DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTPOSITION },
    { &GUID_ZAxis, DIJOFS_Z, DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTPOSITION },
    { &GUID_RxAxis, DIJOFS_RX, DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTPOSITION },
    { &GUID_RyAxis, DIJOFS_RY, DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTPOSITION },
    { &GUID_RzAxis, DIJOFS_RZ, DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTPOSITION },
    { &GUID_Slider, DIJOFS_SLIDER(0), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTPOSITION },
    { &GUID_Slider, DIJOFS_SLIDER(1), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTPOSITION },
    { &GUID_POV, DIJOFS_POV(0), DIDFT_OPTIONAL | DIDFT_POV | DIDFT_ANYINSTANCE, 0 },
    { &GUID_POV, DIJOFS_POV(1), DIDFT_OPTIONAL | DIDFT_POV | DIDFT_ANYINSTANCE, 0 },
    { &GUID_POV, DIJOFS_POV(2), DIDFT_OPTIONAL | DIDFT_POV | DIDFT_ANYINSTANCE, 0 },
    { &GUID_POV, DIJOFS_POV(3), DIDFT_OPTIONAL | DIDFT_POV | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(0), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(1), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(2), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(3), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(4), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(5), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(6), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(7), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(8), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(9), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(10), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(11), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(12), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(13), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(14), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(15), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(16), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(17), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(18), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(19), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(20), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(21), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(22), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(23), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(24), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(25), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(26), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(27), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(28), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(29), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(30), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(31), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(32), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(33), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(34), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(35), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(36), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(37), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(38), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(39), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(40), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(41), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(42), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(43), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(44), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(45), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(46), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(47), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(48), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(49), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(50), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(51), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(52), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(53), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(54), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(55), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(56), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(57), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(58), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(59), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(60), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(61), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(62), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(63), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(64), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(65), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(66), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(67), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(68), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(69), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(70), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(71), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(72), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(73), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(74), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(75), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(76), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(77), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(78), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(79), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(80), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(81), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(82), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(83), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(84), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(85), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(86), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(87), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(88), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(89), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(90), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(91), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(92), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(93), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(94), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(95), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(96), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(97), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(98), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(99), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(100), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(101), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(102), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(103), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(104), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(105), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(106), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(107), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(108), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(109), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(110), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(111), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(112), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(113), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(114), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(115), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(116), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(117), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(118), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(119), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(120), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(121), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(122), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(123), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(124), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(125), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(126), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { NULL, DIJOFS_BUTTON(127), DIDFT_OPTIONAL | DIDFT_BUTTON | DIDFT_ANYINSTANCE, 0 },
    { &GUID_XAxis, FIELD_OFFSET(DIJOYSTATE2, lVX), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTVELOCITY },
    { &GUID_YAxis, FIELD_OFFSET(DIJOYSTATE2, lVY), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTVELOCITY },
    { &GUID_ZAxis, FIELD_OFFSET(DIJOYSTATE2, lVZ), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTVELOCITY },
    { &GUID_RxAxis, FIELD_OFFSET(DIJOYSTATE2, lVRx), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTVELOCITY },
    { &GUID_RyAxis, FIELD_OFFSET(DIJOYSTATE2, lVRy), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTVELOCITY },
    { &GUID_RzAxis, FIELD_OFFSET(DIJOYSTATE2, lVRz), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTVELOCITY },
    /* note: dwOfs value matches Windows */
    { &GUID_Slider, DIJOFS_SLIDER(0), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTVELOCITY },
    { &GUID_Slider, DIJOFS_SLIDER(1), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTVELOCITY },
    { &GUID_XAxis, FIELD_OFFSET(DIJOYSTATE2, lAX), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTACCEL },
    { &GUID_YAxis, FIELD_OFFSET(DIJOYSTATE2, lAY), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTACCEL },
    { &GUID_ZAxis, FIELD_OFFSET(DIJOYSTATE2, lAZ), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTACCEL },
    { &GUID_RxAxis, FIELD_OFFSET(DIJOYSTATE2, lARx), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTACCEL },
    { &GUID_RyAxis, FIELD_OFFSET(DIJOYSTATE2, lARy), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTACCEL },
    { &GUID_RzAxis, FIELD_OFFSET(DIJOYSTATE2, lARz), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTACCEL },
    /* note: dwOfs value matches Windows */
    { &GUID_Slider, DIJOFS_SLIDER(0), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTACCEL },
    { &GUID_Slider, DIJOFS_SLIDER(1), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTACCEL },
    { &GUID_XAxis, FIELD_OFFSET(DIJOYSTATE2, lFX), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTFORCE },
    { &GUID_YAxis, FIELD_OFFSET(DIJOYSTATE2, lFY), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTFORCE },
    { &GUID_ZAxis, FIELD_OFFSET(DIJOYSTATE2, lFZ), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTFORCE },
    { &GUID_RxAxis, FIELD_OFFSET(DIJOYSTATE2, lFRx), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTFORCE },
    { &GUID_RyAxis, FIELD_OFFSET(DIJOYSTATE2, lFRy), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTFORCE },
    { &GUID_RzAxis, FIELD_OFFSET(DIJOYSTATE2, lFRz), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTFORCE },
    /* note: dwOfs value matches Windows */
    { &GUID_Slider, DIJOFS_SLIDER(0), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTFORCE },
    { &GUID_Slider, DIJOFS_SLIDER(1), DIDFT_OPTIONAL | DIDFT_AXIS | DIDFT_ANYINSTANCE, DIDOI_ASPECTFORCE },
};

const DIDATAFORMAT SDL_c_dfDIJoystick2 = {
    sizeof(DIDATAFORMAT),
    sizeof(DIOBJECTDATAFORMAT),
    DIDF_ABSAXIS,
    sizeof(DIJOYSTATE2),
    SDL_arraysize(dfDIJoystick2),
    dfDIJoystick2
};

/* Convert a DirectInput return code to a text message */
static int SetDIerror(const char *function, HRESULT code)
{
    return SDL_SetError("%s() DirectX error 0x%8.8lx", function, code);
}

static SDL_bool SDL_IsXInputDevice(Uint16 vendor_id, Uint16 product_id, const char *hidPath)
{
#if defined(SDL_JOYSTICK_XINPUT) || defined(SDL_JOYSTICK_RAWINPUT)
    SDL_GameControllerType type;

    /* XInput and RawInput backends will pick up XInput-compatible devices */
    if (!SDL_XINPUT_Enabled()
#ifdef SDL_JOYSTICK_RAWINPUT
        && !RAWINPUT_IsEnabled()
#endif
    ) {
        return SDL_FALSE;
    }

    /* If device path contains "IG_" then its an XInput device */
    /* See: https://docs.microsoft.com/windows/win32/xinput/xinput-and-directinput */
    if (SDL_strstr(hidPath, "IG_") != NULL) {
        return SDL_TRUE;
    }

    type = SDL_GetJoystickGameControllerTypeFromVIDPID(vendor_id, product_id, NULL, SDL_FALSE);
    if (type == SDL_CONTROLLER_TYPE_XBOX360 ||
        type == SDL_CONTROLLER_TYPE_XBOXONE ||
        (vendor_id == USB_VENDOR_VALVE && product_id == USB_PRODUCT_STEAM_VIRTUAL_GAMEPAD)) {
        return SDL_TRUE;
    }
#endif /* SDL_JOYSTICK_XINPUT || SDL_JOYSTICK_RAWINPUT */

    return SDL_FALSE;
}

static SDL_bool QueryDeviceName(LPDIRECTINPUTDEVICE8 device, char **device_name)
{
    DIPROPSTRING dipstr;

    if (!device || !device_name) {
        return SDL_FALSE;
    }

    dipstr.diph.dwSize = sizeof(dipstr);
    dipstr.diph.dwHeaderSize = sizeof(dipstr.diph);
    dipstr.diph.dwObj = 0;
    dipstr.diph.dwHow = DIPH_DEVICE;

    if (FAILED(IDirectInputDevice8_GetProperty(device, DIPROP_PRODUCTNAME, &dipstr.diph))) {
        return SDL_FALSE;
    }

    *device_name = WIN_StringToUTF8(dipstr.wsz);

    return SDL_TRUE;
}

static SDL_bool QueryDevicePath(LPDIRECTINPUTDEVICE8 device, char **device_path)
{
    DIPROPGUIDANDPATH dippath;

    if (!device || !device_path) {
        return SDL_FALSE;
    }

    dippath.diph.dwSize = sizeof(dippath);
    dippath.diph.dwHeaderSize = sizeof(dippath.diph);
    dippath.diph.dwObj = 0;
    dippath.diph.dwHow = DIPH_DEVICE;

    if (FAILED(IDirectInputDevice8_GetProperty(device, DIPROP_GUIDANDPATH, &dippath.diph))) {
        return SDL_FALSE;
    }

    *device_path = WIN_StringToUTF8W(dippath.wszPath);

    /* Normalize path to upper case. */
    SDL_strupr(*device_path);

    return SDL_TRUE;
}

static SDL_bool QueryDeviceInfo(LPDIRECTINPUTDEVICE8 device, Uint16 *vendor_id, Uint16 *product_id)
{
    DIPROPDWORD dipdw;

    if (!device || !vendor_id || !product_id) {
        return SDL_FALSE;
    }

    dipdw.diph.dwSize = sizeof(dipdw);
    dipdw.diph.dwHeaderSize = sizeof(dipdw.diph);
    dipdw.diph.dwObj = 0;
    dipdw.diph.dwHow = DIPH_DEVICE;
    dipdw.dwData = 0;

    if (FAILED(IDirectInputDevice8_GetProperty(device, DIPROP_VIDPID, &dipdw.diph))) {
        return SDL_FALSE;
    }

    *vendor_id = LOWORD(dipdw.dwData);
    *product_id = HIWORD(dipdw.dwData);

    return SDL_TRUE;
}

void FreeRumbleEffectData(DIEFFECT *effect)
{
    if (!effect) {
        return;
    }
    SDL_free(effect->rgdwAxes);
    SDL_free(effect->rglDirection);
    SDL_free(effect->lpvTypeSpecificParams);
    SDL_free(effect);
}

DIEFFECT *CreateRumbleEffectData(Sint16 magnitude)
{
    DIEFFECT *effect;
    DIPERIODIC *periodic;

    /* Create the effect */
    effect = (DIEFFECT *)SDL_calloc(1, sizeof(*effect));
    if (!effect) {
        return NULL;
    }
    effect->dwSize = sizeof(*effect);
    effect->dwGain = 10000;
    effect->dwFlags = DIEFF_OBJECTOFFSETS;
    effect->dwDuration = SDL_MAX_RUMBLE_DURATION_MS * 1000; /* In microseconds. */
    effect->dwTriggerButton = DIEB_NOTRIGGER;

    effect->cAxes = 2;
    effect->rgdwAxes = (DWORD *)SDL_calloc(effect->cAxes, sizeof(DWORD));
    if (!effect->rgdwAxes) {
        FreeRumbleEffectData(effect);
        return NULL;
    }

    effect->rglDirection = (LONG *)SDL_calloc(effect->cAxes, sizeof(LONG));
    if (!effect->rglDirection) {
        FreeRumbleEffectData(effect);
        return NULL;
    }
    effect->dwFlags |= DIEFF_CARTESIAN;

    periodic = (DIPERIODIC *)SDL_calloc(1, sizeof(*periodic));
    if (!periodic) {
        FreeRumbleEffectData(effect);
        return NULL;
    }
    periodic->dwMagnitude = CONVERT_MAGNITUDE(magnitude);
    periodic->dwPeriod = 1000000;

    effect->cbTypeSpecificParams = sizeof(*periodic);
    effect->lpvTypeSpecificParams = periodic;

    return effect;
}

int SDL_DINPUT_JoystickInit(void)
{
    HRESULT result;
    HINSTANCE instance;

    if (!SDL_GetHintBoolean(SDL_HINT_DIRECTINPUT_ENABLED, SDL_TRUE)) {
        /* In some environments, IDirectInput8_Initialize / _EnumDevices can take a minute even with no controllers. */
        dinput = NULL;
        return 0;
    }

    result = WIN_CoInitialize();
    if (FAILED(result)) {
        return SetDIerror("CoInitialize", result);
    }

    coinitialized = SDL_TRUE;

    result = CoCreateInstance(&CLSID_DirectInput8, NULL, CLSCTX_INPROC_SERVER,
                              &IID_IDirectInput8, (LPVOID *)&dinput);

    if (FAILED(result)) {
        return SetDIerror("CoCreateInstance", result);
    }

    /* Because we used CoCreateInstance, we need to Initialize it, first. */
    instance = GetModuleHandle(NULL);
    if (!instance) {
        IDirectInput8_Release(dinput);
        dinput = NULL;
        return SDL_SetError("GetModuleHandle() failed with error code %lu.", GetLastError());
    }
    result = IDirectInput8_Initialize(dinput, instance, DIRECTINPUT_VERSION);

    if (FAILED(result)) {
        IDirectInput8_Release(dinput);
        dinput = NULL;
        return SetDIerror("IDirectInput::Initialize", result);
    }
    return 0;
}

static int GetSteamVirtualGamepadSlot(Uint16 vendor_id, Uint16 product_id, const char *device_path)
{
    int slot = -1;

    if (vendor_id == USB_VENDOR_VALVE &&
        product_id == USB_PRODUCT_STEAM_VIRTUAL_GAMEPAD) {
        (void)SDL_sscanf(device_path, "\\\\?\\HID#VID_28DE&PID_11FF&IG_0%d", &slot);
    }
    return slot;
}

/* helper function for direct input, gets called for each connected joystick */
static BOOL CALLBACK EnumJoystickDetectCallback(LPCDIDEVICEINSTANCE pDeviceInstance, LPVOID pContext)
{
#define CHECK(expression)  \
    {                      \
        if (!(expression)) \
            goto err;      \
    }
    JoyStick_DeviceData *pNewJoystick = NULL;
    JoyStick_DeviceData *pPrevJoystick = NULL;
    Uint16 vendor = 0;
    Uint16 product = 0;
    Uint16 version = 0;
    char *hidPath = NULL;
    char *name = NULL;
    LPDIRECTINPUTDEVICE8 device = NULL;

    /* We are only supporting HID devices. */
    CHECK(pDeviceInstance->dwDevType & DIDEVTYPE_HID);

    CHECK(SUCCEEDED(IDirectInput8_CreateDevice(dinput, &pDeviceInstance->guidInstance, &device, NULL)));
    CHECK(QueryDeviceName(device, &name));
    CHECK(QueryDevicePath(device, &hidPath));
    CHECK(QueryDeviceInfo(device, &vendor, &product));

    CHECK(!SDL_IsXInputDevice(vendor, product, hidPath));

    pNewJoystick = *(JoyStick_DeviceData **)pContext;
    while (pNewJoystick) {
        /* update GUIDs of joysticks with matching paths, in case they're not open yet */
        if (SDL_strcmp(pNewJoystick->path, hidPath) == 0) {
            /* if we are replacing the front of the list then update it */
            if (pNewJoystick == *(JoyStick_DeviceData **)pContext) {
                *(JoyStick_DeviceData **)pContext = pNewJoystick->pNext;
            } else if (pPrevJoystick) {
                pPrevJoystick->pNext = pNewJoystick->pNext;
            }

            /* Update with new guid/etc, if it has changed */
            SDL_memcpy(&pNewJoystick->dxdevice, pDeviceInstance, sizeof(DIDEVICEINSTANCE));

            pNewJoystick->pNext = SYS_Joystick;
            SYS_Joystick = pNewJoystick;

            pNewJoystick = NULL;
            CHECK(FALSE);
        }

        pPrevJoystick = pNewJoystick;
        pNewJoystick = pNewJoystick->pNext;
    }

    pNewJoystick = (JoyStick_DeviceData *)SDL_calloc(1, sizeof(JoyStick_DeviceData));
    CHECK(pNewJoystick);

    pNewJoystick->steam_virtual_gamepad_slot = GetSteamVirtualGamepadSlot(vendor, product, hidPath);
    SDL_strlcpy(pNewJoystick->path, hidPath, SDL_arraysize(pNewJoystick->path));
    SDL_memcpy(&pNewJoystick->dxdevice, pDeviceInstance, sizeof(DIDEVICEINSTANCE));

    pNewJoystick->joystickname = SDL_CreateJoystickName(vendor, product, NULL, name);
    CHECK(pNewJoystick->joystickname);

    if (vendor && product) {
        pNewJoystick->guid = SDL_CreateJoystickGUID(SDL_HARDWARE_BUS_USB, vendor, product, version, NULL, name, 0, 0);
    } else {
        pNewJoystick->guid = SDL_CreateJoystickGUID(SDL_HARDWARE_BUS_BLUETOOTH, vendor, product, version, NULL, name, 0, 0);
    }

    CHECK(!SDL_ShouldIgnoreJoystick(pNewJoystick->joystickname, pNewJoystick->guid));

#ifdef SDL_JOYSTICK_HIDAPI
    CHECK(!HIDAPI_IsDevicePresent(vendor, product, version, pNewJoystick->joystickname));
#endif

#ifdef SDL_JOYSTICK_RAWINPUT
    CHECK(!RAWINPUT_IsDevicePresent(vendor, product, version, pNewJoystick->joystickname));
#endif

    WINDOWS_AddJoystickDevice(pNewJoystick);
    pNewJoystick = NULL;

err:
    if (pNewJoystick) {
        SDL_free(pNewJoystick->joystickname);
        SDL_free(pNewJoystick);
    }

    SDL_free(hidPath);
    SDL_free(name);

    if (device) {
        IDirectInputDevice8_Release(device);
    }

    return DIENUM_CONTINUE; /* get next device, please */
#undef CHECK
}

void SDL_DINPUT_JoystickDetect(JoyStick_DeviceData **pContext)
{
    if (!dinput) {
        return;
    }

    IDirectInput8_EnumDevices(dinput, DI8DEVCLASS_GAMECTRL, EnumJoystickDetectCallback, pContext, DIEDFL_ATTACHEDONLY);
}

/* helper function for direct input, gets called for each connected joystick */
typedef struct
{
    Uint16 vendor;
    Uint16 product;
    SDL_bool present;
} Joystick_PresentData;

static BOOL CALLBACK EnumJoystickPresentCallback(LPCDIDEVICEINSTANCE pDeviceInstance, LPVOID pContext)
{
#define CHECK(expression)  \
    {                      \
        if (!(expression)) \
            goto err;      \
    }
    Joystick_PresentData *pData = (Joystick_PresentData *)pContext;
    Uint16 vendor = 0;
    Uint16 product = 0;
    LPDIRECTINPUTDEVICE8 device = NULL;
    BOOL result = DIENUM_CONTINUE;

    /* We are only supporting HID devices. */
    CHECK(pDeviceInstance->dwDevType & DIDEVTYPE_HID);

    CHECK(SUCCEEDED(IDirectInput8_CreateDevice(dinput, &pDeviceInstance->guidInstance, &device, NULL)));
    CHECK(QueryDeviceInfo(device, &vendor, &product));

    if (vendor == pData->vendor && product == pData->product) {
        pData->present = SDL_TRUE;
        result = DIENUM_STOP; /* found it */
    }

err:
    if (device) {
        IDirectInputDevice8_Release(device);
    }

    return result;
#undef CHECK
}

SDL_bool SDL_DINPUT_JoystickPresent(Uint16 vendor_id, Uint16 product_id, Uint16 version_number)
{
    Joystick_PresentData data;

    if (!dinput) {
        return SDL_FALSE;
    }

    data.vendor = vendor_id;
    data.product = product_id;
    data.present = SDL_FALSE;
    IDirectInput8_EnumDevices(dinput, DI8DEVCLASS_GAMECTRL, EnumJoystickPresentCallback, &data, DIEDFL_ATTACHEDONLY);
    return data.present;
}

static BOOL CALLBACK EnumDevObjectsCallback(LPCDIDEVICEOBJECTINSTANCE pDeviceObject, LPVOID pContext)
{
    SDL_Joystick *joystick = (SDL_Joystick *)pContext;
    HRESULT result;
    input_t *in = &joystick->hwdata->Inputs[joystick->hwdata->NumInputs];

    if (pDeviceObject->dwType & DIDFT_BUTTON) {
        in->type = BUTTON;
        in->num = joystick->nbuttons;
        in->ofs = DIJOFS_BUTTON(in->num);
        joystick->nbuttons++;
    } else if (pDeviceObject->dwType & DIDFT_POV) {
        in->type = HAT;
        in->num = joystick->nhats;
        in->ofs = DIJOFS_POV(in->num);
        joystick->nhats++;
    } else if (pDeviceObject->dwType & DIDFT_AXIS) {
        DIPROPRANGE diprg;
        DIPROPDWORD dilong;

        in->type = AXIS;
        in->num = joystick->naxes;
        if (SDL_memcmp(&pDeviceObject->guidType, &GUID_XAxis, sizeof(pDeviceObject->guidType)) == 0) {
            in->ofs = DIJOFS_X;
        } else if (SDL_memcmp(&pDeviceObject->guidType, &GUID_YAxis, sizeof(pDeviceObject->guidType)) == 0) {
            in->ofs = DIJOFS_Y;
        } else if (SDL_memcmp(&pDeviceObject->guidType, &GUID_ZAxis, sizeof(pDeviceObject->guidType)) == 0) {
            in->ofs = DIJOFS_Z;
        } else if (SDL_memcmp(&pDeviceObject->guidType, &GUID_RxAxis, sizeof(pDeviceObject->guidType)) == 0) {
            in->ofs = DIJOFS_RX;
        } else if (SDL_memcmp(&pDeviceObject->guidType, &GUID_RyAxis, sizeof(pDeviceObject->guidType)) == 0) {
            in->ofs = DIJOFS_RY;
        } else if (SDL_memcmp(&pDeviceObject->guidType, &GUID_RzAxis, sizeof(pDeviceObject->guidType)) == 0) {
            in->ofs = DIJOFS_RZ;
        } else if (SDL_memcmp(&pDeviceObject->guidType, &GUID_Slider, sizeof(pDeviceObject->guidType)) == 0) {
            in->ofs = DIJOFS_SLIDER(joystick->hwdata->NumSliders);
            ++joystick->hwdata->NumSliders;
        } else {
            return DIENUM_CONTINUE; /* not an axis we can grok */
        }

        diprg.diph.dwSize = sizeof(diprg);
        diprg.diph.dwHeaderSize = sizeof(diprg.diph);
        diprg.diph.dwObj = pDeviceObject->dwType;
        diprg.diph.dwHow = DIPH_BYID;
        diprg.lMin = SDL_JOYSTICK_AXIS_MIN;
        diprg.lMax = SDL_JOYSTICK_AXIS_MAX;

        result =
            IDirectInputDevice8_SetProperty(joystick->hwdata->InputDevice,
                                            DIPROP_RANGE, &diprg.diph);
        if (FAILED(result)) {
            return DIENUM_CONTINUE; /* don't use this axis */
        }

        /* Set dead zone to 0. */
        dilong.diph.dwSize = sizeof(dilong);
        dilong.diph.dwHeaderSize = sizeof(dilong.diph);
        dilong.diph.dwObj = pDeviceObject->dwType;
        dilong.diph.dwHow = DIPH_BYID;
        dilong.dwData = 0;
        result =
            IDirectInputDevice8_SetProperty(joystick->hwdata->InputDevice,
                                            DIPROP_DEADZONE, &dilong.diph);
        if (FAILED(result)) {
            return DIENUM_CONTINUE; /* don't use this axis */
        }

        joystick->naxes++;
    } else {
        /* not supported at this time */
        return DIENUM_CONTINUE;
    }

    joystick->hwdata->NumInputs++;

    if (joystick->hwdata->NumInputs == MAX_INPUTS) {
        return DIENUM_STOP; /* too many */
    }

    return DIENUM_CONTINUE;
}

/* Sort using the data offset into the DInput struct.
 * This gives a reasonable ordering for the inputs.
 */
static int SDLCALL SortDevFunc(const void *a, const void *b)
{
    const input_t *inputA = (const input_t *)a;
    const input_t *inputB = (const input_t *)b;

    if (inputA->ofs < inputB->ofs) {
        return -1;
    }
    if (inputA->ofs > inputB->ofs) {
        return 1;
    }
    return 0;
}

/* Sort the input objects and recalculate the indices for each input. */
static void SortDevObjects(SDL_Joystick *joystick)
{
    input_t *inputs = joystick->hwdata->Inputs;
    int nButtons = 0;
    int nHats = 0;
    int nAxis = 0;
    int n;

    SDL_qsort(inputs, joystick->hwdata->NumInputs, sizeof(input_t), SortDevFunc);

    for (n = 0; n < joystick->hwdata->NumInputs; n++) {
        switch (inputs[n].type) {
        case BUTTON:
            inputs[n].num = nButtons;
            nButtons++;
            break;

        case HAT:
            inputs[n].num = nHats;
            nHats++;
            break;

        case AXIS:
            inputs[n].num = nAxis;
            nAxis++;
            break;
        }
    }
}

int SDL_DINPUT_JoystickOpen(SDL_Joystick *joystick, JoyStick_DeviceData *joystickdevice)
{
    HRESULT result;
    DIPROPDWORD dipdw;

    joystick->hwdata->buffered = SDL_TRUE;
    joystick->hwdata->Capabilities.dwSize = sizeof(DIDEVCAPS);

    SDL_zero(dipdw);
    dipdw.diph.dwSize = sizeof(DIPROPDWORD);
    dipdw.diph.dwHeaderSize = sizeof(DIPROPHEADER);

    result =
        IDirectInput8_CreateDevice(dinput,
                                   &joystickdevice->dxdevice.guidInstance,
                                   &joystick->hwdata->InputDevice,
                                   NULL);
    if (FAILED(result)) {
        return SetDIerror("IDirectInput::CreateDevice", result);
    }

    /* Acquire shared access. Exclusive access is required for forces,
     * though. */
    result =
        IDirectInputDevice8_SetCooperativeLevel(joystick->hwdata->InputDevice, SDL_HelperWindow,
                                                DISCL_EXCLUSIVE |
                                                    DISCL_BACKGROUND);
    if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::SetCooperativeLevel", result);
    }

    /* Use the extended data structure: DIJOYSTATE2. */
    result =
        IDirectInputDevice8_SetDataFormat(joystick->hwdata->InputDevice,
                                          &SDL_c_dfDIJoystick2);
    if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::SetDataFormat", result);
    }

    /* Get device capabilities */
    result =
        IDirectInputDevice8_GetCapabilities(joystick->hwdata->InputDevice,
                                            &joystick->hwdata->Capabilities);
    if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::GetCapabilities", result);
    }

    /* Force capable? */
    if (joystick->hwdata->Capabilities.dwFlags & DIDC_FORCEFEEDBACK) {
        result = IDirectInputDevice8_Acquire(joystick->hwdata->InputDevice);
        if (FAILED(result)) {
            return SetDIerror("IDirectInputDevice8::Acquire", result);
        }

        /* reset all actuators. */
        result =
            IDirectInputDevice8_SendForceFeedbackCommand(joystick->hwdata->InputDevice,
                                                         DISFFC_RESET);

        /* Not necessarily supported, ignore if not supported.
        if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::SendForceFeedbackCommand", result);
        }
        */

        result = IDirectInputDevice8_Unacquire(joystick->hwdata->InputDevice);

        if (FAILED(result)) {
            return SetDIerror("IDirectInputDevice8::Unacquire", result);
        }

        /* Turn on auto-centering for a ForceFeedback device (until told
         * otherwise). */
        dipdw.diph.dwObj = 0;
        dipdw.diph.dwHow = DIPH_DEVICE;
        dipdw.dwData = DIPROPAUTOCENTER_ON;

        result =
            IDirectInputDevice8_SetProperty(joystick->hwdata->InputDevice,
                                            DIPROP_AUTOCENTER, &dipdw.diph);

        /* Not necessarily supported, ignore if not supported.
        if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::SetProperty", result);
        }
        */
    }

    /* What buttons and axes does it have? */
    IDirectInputDevice8_EnumObjects(joystick->hwdata->InputDevice,
                                    EnumDevObjectsCallback, joystick,
                                    DIDFT_BUTTON | DIDFT_AXIS | DIDFT_POV);

    /* Reorder the input objects. Some devices do not report the X axis as
     * the first axis, for example. */
    SortDevObjects(joystick);

    dipdw.diph.dwObj = 0;
    dipdw.diph.dwHow = DIPH_DEVICE;
    dipdw.dwData = INPUT_QSIZE;

    /* Set the buffer size */
    result =
        IDirectInputDevice8_SetProperty(joystick->hwdata->InputDevice,
                                        DIPROP_BUFFERSIZE, &dipdw.diph);

    if (result == DI_POLLEDDEVICE) {
        /* This device doesn't support buffering, so we're forced
         * to use less reliable polling. */
        joystick->hwdata->buffered = SDL_FALSE;
    } else if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::SetProperty", result);
    }

    /* Poll and wait for initial device state to be populated */
    result = IDirectInputDevice8_Poll(joystick->hwdata->InputDevice);
    if (result == DIERR_INPUTLOST || result == DIERR_NOTACQUIRED) {
        IDirectInputDevice8_Acquire(joystick->hwdata->InputDevice);
        IDirectInputDevice8_Poll(joystick->hwdata->InputDevice);
    }
    SDL_Delay(50);

    return 0;
}

static int SDL_DINPUT_JoystickInitRumble(SDL_Joystick *joystick, Sint16 magnitude)
{
    HRESULT result;

    /* Reset and then enable actuators */
    result = IDirectInputDevice8_SendForceFeedbackCommand(joystick->hwdata->InputDevice, DISFFC_RESET);
    if (result == DIERR_INPUTLOST || result == DIERR_NOTEXCLUSIVEACQUIRED) {
        result = IDirectInputDevice8_Acquire(joystick->hwdata->InputDevice);
        if (SUCCEEDED(result)) {
            result = IDirectInputDevice8_SendForceFeedbackCommand(joystick->hwdata->InputDevice, DISFFC_RESET);
        }
    }
    if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::SendForceFeedbackCommand(DISFFC_RESET)", result);
    }

    result = IDirectInputDevice8_SendForceFeedbackCommand(joystick->hwdata->InputDevice, DISFFC_SETACTUATORSON);
    if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::SendForceFeedbackCommand(DISFFC_SETACTUATORSON)", result);
    }

    /* Create the effect */
    joystick->hwdata->ffeffect = CreateRumbleEffectData(magnitude);
    if (!joystick->hwdata->ffeffect) {
        return SDL_OutOfMemory();
    }

    result = IDirectInputDevice8_CreateEffect(joystick->hwdata->InputDevice, &GUID_Sine,
                                              joystick->hwdata->ffeffect, &joystick->hwdata->ffeffect_ref, NULL);
    if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::CreateEffect", result);
    }
    return 0;
}

int SDL_DINPUT_JoystickRumble(SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble)
{
    HRESULT result;

    /* Scale and average the two rumble strengths */
    Sint16 magnitude = (Sint16)(((low_frequency_rumble / 2) + (high_frequency_rumble / 2)) / 2);

    if (!(joystick->hwdata->Capabilities.dwFlags & DIDC_FORCEFEEDBACK)) {
        return SDL_Unsupported();
    }

    if (joystick->hwdata->ff_initialized) {
        DIPERIODIC *periodic = ((DIPERIODIC *)joystick->hwdata->ffeffect->lpvTypeSpecificParams);
        periodic->dwMagnitude = CONVERT_MAGNITUDE(magnitude);

        result = IDirectInputEffect_SetParameters(joystick->hwdata->ffeffect_ref, joystick->hwdata->ffeffect, (DIEP_DURATION | DIEP_TYPESPECIFICPARAMS));
        if (result == DIERR_INPUTLOST) {
            result = IDirectInputDevice8_Acquire(joystick->hwdata->InputDevice);
            if (SUCCEEDED(result)) {
                result = IDirectInputEffect_SetParameters(joystick->hwdata->ffeffect_ref, joystick->hwdata->ffeffect, (DIEP_DURATION | DIEP_TYPESPECIFICPARAMS));
            }
        }
        if (FAILED(result)) {
            return SetDIerror("IDirectInputDevice8::SetParameters", result);
        }
    } else {
        if (SDL_DINPUT_JoystickInitRumble(joystick, magnitude) < 0) {
            return -1;
        }
        joystick->hwdata->ff_initialized = SDL_TRUE;
    }

    result = IDirectInputEffect_Start(joystick->hwdata->ffeffect_ref, 1, 0);
    if (result == DIERR_INPUTLOST || result == DIERR_NOTEXCLUSIVEACQUIRED) {
        result = IDirectInputDevice8_Acquire(joystick->hwdata->InputDevice);
        if (SUCCEEDED(result)) {
            result = IDirectInputEffect_Start(joystick->hwdata->ffeffect_ref, 1, 0);
        }
    }
    if (FAILED(result)) {
        return SetDIerror("IDirectInputDevice8::Start", result);
    }
    return 0;
}

Uint32 SDL_DINPUT_JoystickGetCapabilities(SDL_Joystick *joystick)
{
    Uint32 result = 0;

    if (joystick->hwdata->Capabilities.dwFlags & DIDC_FORCEFEEDBACK) {
        result |= SDL_JOYCAP_RUMBLE;
    }

    return result;
}

static Uint8 TranslatePOV(DWORD value)
{
    const int HAT_VALS[] = {
        SDL_HAT_UP,
        SDL_HAT_UP | SDL_HAT_RIGHT,
        SDL_HAT_RIGHT,
        SDL_HAT_DOWN | SDL_HAT_RIGHT,
        SDL_HAT_DOWN,
        SDL_HAT_DOWN | SDL_HAT_LEFT,
        SDL_HAT_LEFT,
        SDL_HAT_UP | SDL_HAT_LEFT
    };

    if (LOWORD(value) == 0xFFFF) {
        return SDL_HAT_CENTERED;
    }

    /* Round the value up: */
    value += 4500 / 2;
    value %= 36000;
    value /= 4500;

    if (value >= 8) {
        return SDL_HAT_CENTERED; /* shouldn't happen */
    }

    return HAT_VALS[value];
}

/* 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.
 */
static void UpdateDINPUTJoystickState_Polled(SDL_Joystick *joystick)
{
    DIJOYSTATE2 state;
    HRESULT result;
    int i;

    result =
        IDirectInputDevice8_GetDeviceState(joystick->hwdata->InputDevice,
                                           sizeof(DIJOYSTATE2), &state);
    if (result == DIERR_INPUTLOST || result == DIERR_NOTACQUIRED) {
        IDirectInputDevice8_Acquire(joystick->hwdata->InputDevice);
        result =
            IDirectInputDevice8_GetDeviceState(joystick->hwdata->InputDevice,
                                               sizeof(DIJOYSTATE2), &state);
    }

    if (result != DI_OK) {
        return;
    }

    /* Set each known axis, button and POV. */
    for (i = 0; i < joystick->hwdata->NumInputs; ++i) {
        const input_t *in = &joystick->hwdata->Inputs[i];

        switch (in->type) {
        case AXIS:
            switch (in->ofs) {
            case DIJOFS_X:
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)state.lX);
                break;
            case DIJOFS_Y:
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)state.lY);
                break;
            case DIJOFS_Z:
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)state.lZ);
                break;
            case DIJOFS_RX:
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)state.lRx);
                break;
            case DIJOFS_RY:
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)state.lRy);
                break;
            case DIJOFS_RZ:
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)state.lRz);
                break;
            case DIJOFS_SLIDER(0):
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)state.rglSlider[0]);
                break;
            case DIJOFS_SLIDER(1):
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)state.rglSlider[1]);
                break;
            }
            break;

        case BUTTON:
            SDL_PrivateJoystickButton(joystick, in->num,
                                      (Uint8)(state.rgbButtons[in->ofs - DIJOFS_BUTTON0] ? SDL_PRESSED : SDL_RELEASED));
            break;
        case HAT:
        {
            Uint8 pos = TranslatePOV(state.rgdwPOV[in->ofs - DIJOFS_POV(0)]);
            SDL_PrivateJoystickHat(joystick, in->num, pos);
            break;
        }
        }
    }
}

static void UpdateDINPUTJoystickState_Buffered(SDL_Joystick *joystick)
{
    int i;
    HRESULT result;
    DWORD numevents;
    DIDEVICEOBJECTDATA evtbuf[INPUT_QSIZE];

    numevents = INPUT_QSIZE;
    result =
        IDirectInputDevice8_GetDeviceData(joystick->hwdata->InputDevice,
                                          sizeof(DIDEVICEOBJECTDATA), evtbuf,
                                          &numevents, 0);
    if (result == DIERR_INPUTLOST || result == DIERR_NOTACQUIRED) {
        IDirectInputDevice8_Acquire(joystick->hwdata->InputDevice);
        result =
            IDirectInputDevice8_GetDeviceData(joystick->hwdata->InputDevice,
                                              sizeof(DIDEVICEOBJECTDATA),
                                              evtbuf, &numevents, 0);
    }

    /* Handle the events or punt */
    if (FAILED(result)) {
        return;
    }

    for (i = 0; i < (int)numevents; ++i) {
        int j;

        for (j = 0; j < joystick->hwdata->NumInputs; ++j) {
            const input_t *in = &joystick->hwdata->Inputs[j];

            if (evtbuf[i].dwOfs != in->ofs) {
                continue;
            }

            switch (in->type) {
            case AXIS:
                SDL_PrivateJoystickAxis(joystick, in->num, (Sint16)evtbuf[i].dwData);
                break;
            case BUTTON:
                SDL_PrivateJoystickButton(joystick, in->num,
                                          (Uint8)(evtbuf[i].dwData ? SDL_PRESSED : SDL_RELEASED));
                break;
            case HAT:
            {
                Uint8 pos = TranslatePOV(evtbuf[i].dwData);
                SDL_PrivateJoystickHat(joystick, in->num, pos);
            } break;
            }
        }
    }

    if (result == DI_BUFFEROVERFLOW) {
        /* Our buffer wasn't big enough to hold all the queued events,
         * so poll the device to make sure we have the complete state.
         */
        UpdateDINPUTJoystickState_Polled(joystick);
    }
}

void SDL_DINPUT_JoystickUpdate(SDL_Joystick *joystick)
{
    HRESULT result;

    result = IDirectInputDevice8_Poll(joystick->hwdata->InputDevice);
    if (result == DIERR_INPUTLOST || result == DIERR_NOTACQUIRED) {
        IDirectInputDevice8_Acquire(joystick->hwdata->InputDevice);
        IDirectInputDevice8_Poll(joystick->hwdata->InputDevice);
    }

    if (joystick->hwdata->buffered) {
        UpdateDINPUTJoystickState_Buffered(joystick);
    } else {
        UpdateDINPUTJoystickState_Polled(joystick);
    }
}

void SDL_DINPUT_JoystickClose(SDL_Joystick *joystick)
{
    if (joystick->hwdata->ffeffect_ref) {
        IDirectInputEffect_Unload(joystick->hwdata->ffeffect_ref);
        joystick->hwdata->ffeffect_ref = NULL;
    }
    if (joystick->hwdata->ffeffect) {
        FreeRumbleEffectData(joystick->hwdata->ffeffect);
        joystick->hwdata->ffeffect = NULL;
    }
    IDirectInputDevice8_Unacquire(joystick->hwdata->InputDevice);
    IDirectInputDevice8_Release(joystick->hwdata->InputDevice);
    joystick->hwdata->ff_initialized = SDL_FALSE;
}

void SDL_DINPUT_JoystickQuit(void)
{
    if (dinput != NULL) {
        IDirectInput8_Release(dinput);
        dinput = NULL;
    }

    if (coinitialized) {
        WIN_CoUninitialize();
        coinitialized = SDL_FALSE;
    }
}

#else /* !SDL_JOYSTICK_DINPUT */

typedef struct JoyStick_DeviceData JoyStick_DeviceData;

int SDL_DINPUT_JoystickInit(void)
{
    return 0;
}

void SDL_DINPUT_JoystickDetect(JoyStick_DeviceData **pContext)
{
}

SDL_bool SDL_DINPUT_JoystickPresent(Uint16 vendor, Uint16 product, Uint16 version)
{
    return SDL_FALSE;
}

int SDL_DINPUT_JoystickOpen(SDL_Joystick *joystick, JoyStick_DeviceData *joystickdevice)
{
    return SDL_Unsupported();
}

int SDL_DINPUT_JoystickRumble(SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble)
{
    return SDL_Unsupported();
}

Uint32 SDL_DINPUT_JoystickGetCapabilities(SDL_Joystick *joystick)
{
    return 0;
}

void SDL_DINPUT_JoystickUpdate(SDL_Joystick *joystick)
{
}

void SDL_DINPUT_JoystickClose(SDL_Joystick *joystick)
{
}

void SDL_DINPUT_JoystickQuit(void)
{
}

#endif /* SDL_JOYSTICK_DINPUT */

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