path: root/StarsEx/Joystick.cpp

/*  Starshatter: The Open Source Project
    Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
    Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
    Copyright (c) 1997-2006, Destroyer Studios LLC.

    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Joystick Input class
*/

#include "GameWinDX9.h"
#include "Joystick.h"
#include "MachineInfo.h"
#include "Types.h"

#define DIRECTINPUT_VERSION 0x0800

#include <dinput.h>

#define JOY_POVUPRIGHT   4500
#define JOY_POVDNRIGHT  13500
#define JOY_POVDNLEFT   22500
#define JOY_POVUPLEFT   31500

// +--------------------------------------------------------------------+
// DIRECT INPUT SUPPORT

const  int                    MAX_DEVICES = 8;

static LPDIRECTINPUT7         pdi   = 0;
static LPDIRECTINPUTDEVICE7   pdev  = 0;
static DIDEVICEINSTANCE       devices[MAX_DEVICES];
static int                    ndev  = 0;
static int                    idev  = -1;
static int                    strikes = 3;

static Joystick*              joystick = 0;

void   DirectInputError(const char* msg, HRESULT err);
const char*  DIErrStr(HRESULT hr);
void   ReleaseDirectInput();

// +--------------------------------------------------------------------+

Joystick::Joystick()
: x(0), y(0), z(0), p(0), r(0), w(0), t(0)
{
    if (!joystick)
    joystick = this;

    select      =   1;
    rudder      =   0;
    throttle    =   1;
    sensitivity =  25;
    dead_zone   = 100;

    for (int i = 0; i < MotionController::MaxActions; i++)
    action[i] = false;

    for (int i = 0; i < KEY_MAP_SIZE; i++)
    map[i] = 0;

    for (int i = 0; i < 4; i++) {
        for (int j = 0; j < 4; j++) {
            hat[i][j] = false;
        }
    }

    map_axis[0] = KEY_JOY_AXIS_X;
    map_axis[1] = KEY_JOY_AXIS_Y;
    map_axis[2] = KEY_JOY_AXIS_RZ;
    map_axis[3] = KEY_JOY_AXIS_S0;

    inv_axis[0] = false;
    inv_axis[1] = false;
    inv_axis[2] = false;
    inv_axis[3] = false;

    if (MachineInfo::GetDirectXVersion() < MachineInfo::DX_7) {
        Print("Joystick: DI7 not found, using multimedia library\n");
        pdi  = 0;
        pdev = 0;
    }

    else if (!pdi) {
        HRESULT hr = DirectInput8Create(GameWinDX9::GetInstance()->GetHINST(),
        DIRECTINPUT_VERSION,
        IID_IDirectInput7,
        (void**)&pdi,
        NULL);
        if FAILED(hr) {
            DirectInputError("Failed to initialize DI7", hr);
            pdi  = 0;
            pdev = 0;
        }
        else {
            Print("Joystick: initialized DI7 pdi = %08x\n", (DWORD) pdi);
        }
    }
}

Joystick::~Joystick()
{
    ReleaseDirectInput();
    joystick = 0;
}

void ReleaseDirectInput()
{
    if (pdev) {
        pdev->Unacquire();
        pdev->Release();
        pdev = 0;
    }

    if (pdi) {
        pdi->Release();
        pdi = 0;
    }
}

Joystick* Joystick::GetInstance()
{
    return joystick;
}

// +--------------------------------------------------------------------+

void
Joystick::MapKeys(KeyMapEntry* mapping, int nkeys)
{
    ZeroMemory(map, sizeof(map));

    for (int i = 0; i < nkeys; i++) {
        KeyMapEntry k = mapping[i];

        if (k.act >= KEY_MAP_FIRST && k.act < KEY_MAP_LAST) {
            if (k.act == KEY_JOY_SENSE)
            sensitivity = k.key;

            else if (k.act == KEY_JOY_DEAD_ZONE)
            dead_zone = k.key;

            else if (k.act == KEY_JOY_SWAP)
            swapped = k.key;

            else if (k.act == KEY_JOY_RUDDER)
            rudder = k.key;

            else if (k.act == KEY_JOY_THROTTLE)
            throttle = k.key;

            else if (k.act == KEY_JOY_SELECT)
            select = k.key;


            else if (k.act == KEY_AXIS_YAW)
            map_axis[0] = k.key;

            else if (k.act == KEY_AXIS_PITCH)
            map_axis[1] = k.key;

            else if (k.act == KEY_AXIS_ROLL)
            map_axis[2] = k.key;

            else if (k.act == KEY_AXIS_THROTTLE)
            map_axis[3] = k.key;


            else if (k.act == KEY_AXIS_YAW_INVERT)
            inv_axis[0] = k.key ? true : false;

            else if (k.act == KEY_AXIS_PITCH_INVERT)
            inv_axis[1] = k.key ? true : false;

            else if (k.act == KEY_AXIS_ROLL_INVERT)
            inv_axis[2] = k.key ? true : false;

            else if (k.act == KEY_AXIS_THROTTLE_INVERT)
            inv_axis[3] = k.key ? true : false;

            else if (k.key >= KEY_JOY_1 && k.key <= KEY_JOY_32)
            map[k.act] = k.key;

            else if (k.alt >= KEY_JOY_1 && k.alt <= KEY_JOY_32)
            map[k.act] = k.alt;

            else if (k.joy >= KEY_JOY_1 && k.joy <= KEY_JOY_32)
            map[k.act] = k.joy;

            else if (k.key >= KEY_POV_0_UP && k.key <= KEY_POV_3_RIGHT)
            map[k.act] = k.key;

            else if (k.alt >= KEY_POV_0_UP && k.alt <= KEY_POV_3_RIGHT)
            map[k.act] = k.alt;

            else if (k.joy >= KEY_POV_0_UP && k.joy <= KEY_POV_3_RIGHT)
            map[k.act] = k.joy;
        }
    }
}

// +--------------------------------------------------------------------+

static inline double sqr(double a) { return a*a; }

BOOL FAR PASCAL EnumJoystick(LPCDIDEVICEINSTANCE pdinst, LPVOID pvSelect)
{
    CopyMemory(&devices[ndev++], pdinst, pdinst->dwSize);

    ::Print("EnumJoystick %d: '%s'\n", ndev, pdinst->tszInstanceName);
    ::Print("   guid:    {%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x} \n",
    (DWORD)  pdinst->guidInstance.Data1,
    (WORD)   pdinst->guidInstance.Data2,
    (WORD)   pdinst->guidInstance.Data3,
    (BYTE)   pdinst->guidInstance.Data4[0],
    (BYTE)   pdinst->guidInstance.Data4[1],
    (BYTE)   pdinst->guidInstance.Data4[2],
    (BYTE)   pdinst->guidInstance.Data4[3],
    (BYTE)   pdinst->guidInstance.Data4[4],
    (BYTE)   pdinst->guidInstance.Data4[5]);

    if (ndev < MAX_DEVICES)
    return DIENUM_CONTINUE;

    return DIENUM_STOP;
}

bool CreateDevice(int select)
{
    if (!pdi || ndev < select)
    return false;

    LPCDIDEVICEINSTANCE pdinst = &devices[select-1];

    ::Print("Joystick CreateDevice(%d)\n", select);
    ::Print("   name:    %s\n\n",   pdinst->tszInstanceName);

    // release current device before trying to get another:
    if (pdev) {
        pdev->Unacquire();
        pdev->Release();
        pdev = 0;
    }

    HRESULT hr = DI_OK;
    // Create the DirectInput joystick device:
    hr = pdi->CreateDeviceEx(pdinst->guidInstance,
    IID_IDirectInputDevice7,
    (void**)&pdev,
    NULL);

    if (hr != DI_OK || pdev == 0) {
        DirectInputError("Create Device Ex failed", hr);
        return false;
    }

    // Set the data format:
    hr = pdev->SetDataFormat(&c_dfDIJoystick);

    if (hr != DI_OK) {
        DirectInputError("Set Data Format failed", hr);
        pdev->Release();
        pdev = 0;
        return false;
    }

    // Set the coop level:
    hr = pdev->SetCooperativeLevel(GameWinDX9::GetInstance()->GetHWND(), DISCL_NONEXCLUSIVE | DISCL_FOREGROUND);

    if (hr != DI_OK) {
        DirectInputError("Set Cooperative Level failed", hr);
        pdev->Release();
        return false;
    }

    // Set data ranges
    DIPROPRANGE diprg;
    diprg.lMin              = -32768;
    diprg.lMax              = +32768;

    diprg.diph.dwSize       = sizeof(diprg);
    diprg.diph.dwHeaderSize = sizeof(diprg.diph);
    diprg.diph.dwObj        = DIJOFS_X;
    diprg.diph.dwHow        = DIPH_BYOFFSET;
    pdev->SetProperty(DIPROP_RANGE, &diprg.diph);

    diprg.diph.dwObj        = DIJOFS_Y;
    pdev->SetProperty(DIPROP_RANGE, &diprg.diph);

    diprg.diph.dwObj        = DIJOFS_Z;
    pdev->SetProperty(DIPROP_RANGE, &diprg.diph);

    diprg.diph.dwObj        = DIJOFS_RX;
    pdev->SetProperty(DIPROP_RANGE, &diprg.diph);

    diprg.diph.dwObj        = DIJOFS_RY;
    pdev->SetProperty(DIPROP_RANGE, &diprg.diph);

    diprg.diph.dwObj        = DIJOFS_RZ;
    pdev->SetProperty(DIPROP_RANGE, &diprg.diph);

    diprg.diph.dwObj        = DIJOFS_SLIDER(0);
    pdev->SetProperty(DIPROP_RANGE, &diprg.diph);

    diprg.diph.dwObj        = DIJOFS_SLIDER(1);
    pdev->SetProperty(DIPROP_RANGE, &diprg.diph);

    ::Print("Created joystick %d (pdev = %08x)\n", select, (DWORD) pdev);
    idev = select;
    return true;
}

void
Joystick::EnumerateDevices()
{
    if (!pdi) {
        Print("Joystick: no DI7, unable to enumerate devices\n");
        ndev = 0;
    }

    else if (ndev < 1) {
        Print("Joystick: preparing to enumerate devices\n");

        ndev = 0;
        HRESULT hr =
        pdi->EnumDevices(DI8DEVTYPE_JOYSTICK,
        EnumJoystick,
        (LPVOID) 0,
        DIEDFL_ATTACHEDONLY);

        if (FAILED(hr)) {
            DirectInputError("Failed to enumerate devices", hr);
            ReleaseDirectInput();
        }

        else if (ndev < 1) {
            Print("Joystick: no devices found\n");
            ReleaseDirectInput();
        }
    }
}

int
Joystick::NumDevices()
{
    return ndev;
}

const char*
Joystick::GetDeviceName(int i)
{
    if (i >= 0 && i < ndev)
    return devices[i].tszInstanceName;

    return 0;
}

// +--------------------------------------------------------------------+

static DIJOYSTATE joystate;
static JOYINFOEX  joyinfo;

int
Joystick::ReadRawAxis(int a)
{
    if (!joystick)
    return 0;

    int result = 0;

    if (pdev) {
        switch (a) {
        case KEY_JOY_AXIS_X:    result = joystate.lX;            break;
        case KEY_JOY_AXIS_Y:    result = joystate.lY;            break;
        case KEY_JOY_AXIS_Z:    result = joystate.lZ;            break;
        case KEY_JOY_AXIS_RX:   result = joystate.lRx;           break;
        case KEY_JOY_AXIS_RY:   result = joystate.lRy;           break;
        case KEY_JOY_AXIS_RZ:   result = joystate.lRz;           break;
        case KEY_JOY_AXIS_S0:   result = joystate.rglSlider[0];  break;
        case KEY_JOY_AXIS_S1:   result = joystate.rglSlider[1];  break;
        }
    }

    else {
        switch (a) {
        case KEY_JOY_AXIS_X:
            if (joyinfo.dwFlags & JOY_RETURNX)
            result = joyinfo.dwXpos;
            break;

        case KEY_JOY_AXIS_Y:
            if (joyinfo.dwFlags & JOY_RETURNY)
            result = joyinfo.dwYpos;
            break;

        case KEY_JOY_AXIS_Z:
            if (joyinfo.dwFlags & JOY_RETURNZ)
            result = joyinfo.dwZpos;
            break;

        case KEY_JOY_AXIS_RZ:
            if (joyinfo.dwFlags & JOY_RETURNR)
            result = joyinfo.dwRpos;
            break;
        }
    }

    return result;
}

double
Joystick::ReadAxisDI(int a)
{
    if (a < 0 || a > 3)
    return 0;

    double result = 0;

    switch (map_axis[a]) {
    case KEY_JOY_AXIS_X:    result = joystate.lX;            break;
    case KEY_JOY_AXIS_Y:    result = joystate.lY;            break;
    case KEY_JOY_AXIS_Z:    result = joystate.lZ;            break;
    case KEY_JOY_AXIS_RX:   result = joystate.lRx;           break;
    case KEY_JOY_AXIS_RY:   result = joystate.lRy;           break;
    case KEY_JOY_AXIS_RZ:   result = joystate.lRz;           break;
    case KEY_JOY_AXIS_S0:   result = joystate.rglSlider[0];  break;
    case KEY_JOY_AXIS_S1:   result = joystate.rglSlider[1];  break;
    }

    if (a < 3) {
        // ignore small movements:
        if (result > dead_zone)       result -= dead_zone;
        else if (result < -dead_zone) result += dead_zone;
        else                          result = 0;

        double scale = 1.0 / (32768.0-dead_zone);

        if (result >= 0)
        result = sqr(result * scale);
        else
        result = sqr(result * scale) * -1.0;

        if (inv_axis[a])
        result = -result;
    }
    else {
        result = (result+32768.0) / 65536.0;

        if (inv_axis[a])
        result = 1 - result;
    }


    return result;
}

double
Joystick::ReadAxisMM(int a)
{
    if (a < 0 || a > 3)
    return 0;

    double result = 0;
    switch (map_axis[a]) {
    case KEY_JOY_AXIS_X:
        if (joyinfo.dwFlags & JOY_RETURNX)
        result = static_cast<double>(joyinfo.dwXpos) - 32768.0;
        break;

    case KEY_JOY_AXIS_Y:
        if (joyinfo.dwFlags & JOY_RETURNY)
        result = static_cast<double>(joyinfo.dwYpos) - 32768.0;
        break;

    case KEY_JOY_AXIS_Z:
        if (joyinfo.dwFlags & JOY_RETURNZ)
        result = static_cast<double>(joyinfo.dwZpos) - 32768.0;
        break;

    case KEY_JOY_AXIS_RZ:
        if (joyinfo.dwFlags & JOY_RETURNR)
        result = static_cast<double>(joyinfo.dwRpos) - 32768.0;
        break;
    }

    if (a < 3) {
        // ignore small movements:
        if (result > dead_zone)       result -= dead_zone;
        else if (result < -dead_zone) result += dead_zone;
        else                          result = 0;

        double scale = 1.0 / (32768.0-dead_zone);

        if (result >= 0)
        result = sqr(result * scale);
        else
        result = sqr(result * scale) * -1.0;

        if (inv_axis[a])
        result = -result;
    }
    else {
        result = (result+32768.0) / 65536.0;

        if (inv_axis[a])
        result = 1 - result;
    }

    return result;
}

// +--------------------------------------------------------------------+

void
Joystick::Acquire()
{
    t = x = y = z = p = r = w = 0;
    for (int i = 0; i < MotionController::MaxActions; i++)
    action[i] = false;

    for (int i = 0; i < 4; i++)
    for (int j = 0; j < 4; j++)
    hat[i][j] = false;

    if (select == 0)
    return;

    //============================================================
    //
    // FIRST TRY DIRECT INPUT

    bool acquired = false;

    if (pdi) {
        if (idev != select) {
            if (ndev < 1)
            EnumerateDevices();

            if (CreateDevice(select) && pdev)
            pdev->Acquire();
        }

        if (pdev) {
            HRESULT     hr = 0;

            hr = pdev->Poll();
            hr = pdev->GetDeviceState(sizeof(joystate), &joystate);

            if (hr == DIERR_INPUTLOST) {
                pdev->Acquire();

                hr = pdev->Poll();
                hr = pdev->GetDeviceState(sizeof(joystate), &joystate);

                if (FAILED(hr)) {
                    strikes--;
                    ::Print("Joystick could not re-acquire joystick (%08x)\n", hr);

                    // give up before you hurt yourself:
                    if (strikes <= 0) {
                        ReleaseDirectInput();
                        ndev   = 0;
                        select = 0;
                    }

                    return;
                }
            }

            for (int i = 0; i < 32; i++)
            action[i] = (joystate.rgbButtons[i] & 0x80) != 0;

            double joy_x = ReadAxisDI(0);
            double joy_y = ReadAxisDI(1);
            double joy_r = rudder   ? ReadAxisDI(2) : 0;
            double joy_t = throttle ? ReadAxisDI(3) : 0;

            int joy_p = joystate.rgdwPOV[0];

            ProcessAxes(joy_x, joy_y, joy_r, joy_t);

            for (int i = 0; i < 4; i++)
            ProcessHat(i, joystate.rgdwPOV[i]);

            acquired = true;
        }
    }

    //============================================================
    //
    // THEN TRY WINDOWS MULTIMEDIA LIBRARY

    if (!acquired) {
        memset(&joyinfo, 0, sizeof(JOYINFOEX));
        joyinfo.dwSize  = sizeof(JOYINFOEX);
        joyinfo.dwFlags = JOY_RETURNALL;

        HRESULT hr = 0;

        if (select == 1)
        hr = joyGetPosEx(JOYSTICKID1, &joyinfo);

        else if (select == 2)
        hr = joyGetPosEx(JOYSTICKID2, &joyinfo);

        if (hr != 0) {
            Print("\nJoystick::Acquire() joyGetPosEx %d failed (err=%08x)\n\n", select, hr);
            select = 0;
        }

        action[0] = (joyinfo.dwButtons & JOY_BUTTON1) ? true : false;
        action[1] = (joyinfo.dwButtons & JOY_BUTTON2) ? true : false;
        action[2] = (joyinfo.dwButtons & JOY_BUTTON3) ? true : false;
        action[3] = (joyinfo.dwButtons & JOY_BUTTON4) ? true : false;

        double joy_x = ReadAxisMM(0);
        double joy_y = ReadAxisMM(1);
        double joy_r = rudder   ? ReadAxisMM(2) : 0;
        double joy_t = throttle ? ReadAxisMM(3) : 0;

        ProcessAxes(joy_x, joy_y, joy_r, joy_t);
        ProcessHat(0, joyinfo.dwPOV);
    }

    // lateral translations:
    if (KeyDownMap(KEY_PLUS_Y))            y =  1;
    else if (KeyDownMap(KEY_MINUS_Y))      y = -1;

    if (KeyDownMap(KEY_PLUS_Z))            z =  1;
    else if (KeyDownMap(KEY_MINUS_Z))      z = -1;

    if (KeyDownMap(KEY_MINUS_X))           x = -1;
    else if (KeyDownMap(KEY_PLUS_X))       x =  1;

    // button-based turns:
    const  double  steps=10;
    static double  p1=0, r1=0, w1=0;

    // if roll and yaw are swapped --------------------------
    if (swapped) {
        // yaw:
        if (KeyDownMap(KEY_ROLL_LEFT))         { if (w1<steps) w1+=1; w = -sqr(w1/steps); }
        else if (KeyDownMap(KEY_ROLL_RIGHT))   { if (w1<steps) w1+=1; w =  sqr(w1/steps); }

        // roll:
        if (KeyDownMap(KEY_YAW_LEFT))          { if (r1<steps) r1+=1; r =  sqr(r1/steps); }
        else if (KeyDownMap(KEY_YAW_RIGHT))    { if (r1<steps) r1+=1; r = -sqr(r1/steps); }
        else w1 = 0;
    }

    // else roll and yaw are NOT swapped ---------------------
    else {
        // roll:
        if (KeyDownMap(KEY_ROLL_LEFT))         { if (r1<steps) r1+=1; r =  sqr(r1/steps); }
        else if (KeyDownMap(KEY_ROLL_RIGHT))   { if (r1<steps) r1+=1; r = -sqr(r1/steps); }

        // yaw left-right
        if (KeyDownMap(KEY_YAW_LEFT))          { if (w1<steps) w1+=1; w = -sqr(w1/steps); }
        else if (KeyDownMap(KEY_YAW_RIGHT))    { if (w1<steps) w1+=1; w =  sqr(w1/steps); }
        else w1 = 0;
    }

    // pitch --------------------------------------------------
    if (KeyDownMap(KEY_PITCH_UP))             { if (p1<steps) p1+=1; p = -sqr(p1/steps); }
    else if (KeyDownMap(KEY_PITCH_DOWN))      { if (p1<steps) p1+=1; p =  sqr(p1/steps); }
    else p1 = 0;
}

// +--------------------------------------------------------------------+

void
Joystick::ProcessAxes(double joy_x, double joy_y, double joy_r, double joy_t)
{
    int roll_enable = 0;

    joy_y *= -1;
    joy_t  = 1 - joy_t;

    if (map[KEY_ROLL_ENABLE])
    roll_enable = action[map[KEY_ROLL_ENABLE] - KEY_JOY_1];

    // if roll and yaw are swapped --------------------------
    if (swapped) {
        if (roll_enable) {
            w =  joy_x;
            r =  joy_r;
        }
        else {
            w =  joy_r;
            r = -joy_x;
        }
    }

    // else roll and yaw are NOT swapped ---------------------
    else {
        if (roll_enable) {
            w =  joy_r;
            r =  joy_x;
        }
        else {
            w =  joy_x;
            r = -joy_r;
        }
    }

    p = joy_y;

    // read throttle:
    if (throttle) {
        static double init_throttle = -1;
        static bool   latch_throttle = false;

        if (init_throttle < 0)
        init_throttle = joy_t;
        else if (init_throttle != joy_t)
        latch_throttle = true;

        if (latch_throttle)
        t = joy_t;
        else
        t = 0;
    }
    else {
        t = 0;
    }
}

void
Joystick::ProcessHat(int i, DWORD joy_pov)
{
    if (i < 0 || i > 3) return;

    if (LOWORD(joy_pov) == 0xFFFF)
    return;

    switch (joy_pov) {
    case JOY_POVFORWARD:    hat[i][0] = true; break;
    case JOY_POVBACKWARD:   hat[i][1] = true; break;
    case JOY_POVLEFT:       hat[i][2] = true; break;
    case JOY_POVRIGHT:      hat[i][3] = true; break;

    case JOY_POVUPRIGHT:    hat[i][0] = true;
        hat[i][3] = true; break;

    case JOY_POVDNRIGHT:    hat[i][1] = true;
        hat[i][3] = true; break;

    case JOY_POVDNLEFT:     hat[i][1] = true;
        hat[i][2] = true; break;

    case JOY_POVUPLEFT:     hat[i][0] = true;
        hat[i][2] = true; break;

    default:                                  break;
    }
}

// +--------------------------------------------------------------------+

bool Joystick::KeyDown(int key)
{
    if (!joystick)
    return false;

    if (key >= KEY_JOY_1 && key <= KEY_JOY_32)
    return joystick->action[key - KEY_JOY_1];

    else if (key >= KEY_POV_0_UP && key <= KEY_POV_0_RIGHT)
    return joystick->hat[0][key - KEY_POV_0_UP];

    else if (key >= KEY_POV_1_UP && key <= KEY_POV_1_RIGHT)
    return joystick->hat[1][key - KEY_POV_1_UP];

    else if (key >= KEY_POV_2_UP && key <= KEY_POV_2_RIGHT)
    return joystick->hat[2][key - KEY_POV_2_UP];

    else if (key >= KEY_POV_3_UP && key <= KEY_POV_3_RIGHT)
    return joystick->hat[3][key - KEY_POV_3_UP];

    return false;
}

// +--------------------------------------------------------------------+

bool Joystick::KeyDownMap(int key)
{
    if (!joystick)
    return false;

    if (key >= KEY_MAP_FIRST && key <= KEY_MAP_LAST && joystick->map[key])
    return KeyDown(joystick->map[key]);

    return false;
}

// +--------------------------------------------------------------------+

int Joystick::GetAxisMap(int n)
{
    if (!joystick || n < 0 || n > 3)
    return -1;

    return joystick->map_axis[n];
}

int Joystick::GetAxisInv(int n)
{
    if (!joystick || n < 0 || n > 3)
    return -1;

    return joystick->inv_axis[n];
}

// +--------------------------------------------------------------------+

void
DirectInputError(const char* msg, HRESULT err)
{
    static int report = 50;
    if (report > 0)
    report--;
    else
    return;

    Print("   DirectInput7: %s. [%s]\n", msg, DIErrStr(err));
}

static char errstrbuf[128];

const char* DIErrStr(HRESULT hr)
{
    auto casted = static_cast<long long int>(hr);
    switch (casted) {
    default:
        sprintf_s(errstrbuf, "Unrecognized error value = %08x.", casted);
        return errstrbuf;

    case DI_OK:
        return "No error.";

    case DI_BUFFEROVERFLOW:
        return "The device buffer overflowed and some input was lost. This value is equal to the S_FALSE standard COM return value.";
    case DI_DOWNLOADSKIPPED:
        return "The parameters of the effect were successfully updated, but the effect could not be downloaded because the associated device was not acquired in exclusive mode.";
    case DI_EFFECTRESTARTED:
        return "The effect was stopped, the parameters were updated, and the effect was restarted.";
    case DI_POLLEDDEVICE:
        return "The device is a polled device. As a result, device buffering does not collect any data and event notifications is not signaled until the IDirectInputDevice7::Poll method is called.";
    case DI_TRUNCATED:
        return "The parameters of the effect were successfully updated, but some of them were beyond the capabilities of the device and were truncated to the nearest supported value.";
    case DI_TRUNCATEDANDRESTARTED:
        return "Equal to DI_EFFECTRESTARTED | DI_TRUNCATED";
    case DIERR_ACQUIRED:
        return "The operation cannot be performed while the device is acquired.";
    case DIERR_ALREADYINITIALIZED:
        return "This object is already initialized";
    case DIERR_BADDRIVERVER:
        return "The object could not be created due to an incompatible driver version or mismatched or incomplete driver components.";
    case DIERR_BETADIRECTINPUTVERSION:
        return "The application was written for an unsupported prerelease version of DirectInput.";
    case DIERR_DEVICEFULL:
        return "The device is full.";
    case DIERR_DEVICENOTREG:
        return "The device or device instance is not registered with DirectInput. This value is equal to the REGDB_E_CLASSNOTREG standard COM return value.";
    case DIERR_EFFECTPLAYING:
        return "The parameters were updated in memory but were not downloaded to the device because the device does not support updating an effect while it is still playing.";
    case DIERR_HASEFFECTS:
        return "The device cannot be reinitialized because there are still effects attached to it.";
    case DIERR_GENERIC:
        return "An undetermined error occurred inside the DirectInput subsystem. This value is equal to the E_FAIL standard COM return value.";
    case DIERR_HANDLEEXISTS:
        return "The device already has an event notification associated with it. This value is equal to the E_ACCESSDENIED standard COM return value.";
    case DIERR_INCOMPLETEEFFECT:
        return "The effect could not be downloaded because essential information is missing. For example, no axes have been associated with the effect, or no type-specific information has been supplied.";
    case DIERR_INPUTLOST:
        return "Access to the input device has been lost. It must be reacquired.";
    case DIERR_INVALIDPARAM:
        return "An invalid parameter was passed to the returning function, or the object was not in a state that permitted the function to be called. This value is equal to the E_INVALIDARG standard COM return value.";
    case DIERR_MOREDATA:
        return "Not all the requested information fit into the buffer.";
    case DIERR_NOAGGREGATION:
        return "This object does not support aggregation.";
    case DIERR_NOINTERFACE:
        return "The specified interface is not supported by the object. This value is equal to the E_NOINTERFACE standard COM return value.";
    case DIERR_NOTACQUIRED:
        return "The operation cannot be performed unless the device is acquired.";
    case DIERR_NOTBUFFERED:
        return "The device is not buffered. Set the DIPROP_BUFFERSIZE property to enable buffering.";
    case DIERR_NOTDOWNLOADED:
        return "The effect is not downloaded.";
    case DIERR_NOTEXCLUSIVEACQUIRED:
        return "The operation cannot be performed unless the device is acquired in DISCL_EXCLUSIVE mode.";
    case DIERR_NOTFOUND:
        return "The requested object does not exist.";
    case DIERR_NOTINITIALIZED:
        return "This object has not been initialized.";
    case DIERR_OLDDIRECTINPUTVERSION:
        return "The application requires a newer version of DirectInput.";
    case DIERR_OUTOFMEMORY:
        return "The DirectInput subsystem could not allocate sufficient memory to complete the call. This value is equal to the E_OUTOFMEMORY standard COM return value.";
    case DIERR_REPORTFULL:
        return "More information was requested to be sent than can be sent to the device.";
    case DIERR_UNPLUGGED:
        return "The operation could not be completed because the device is not plugged in.";
    case DIERR_UNSUPPORTED:
        return "The function called is not supported at this time. This value is equal to the E_NOTIMPL standard COM return value.";
    }
}