dinput: split from logic module

For use in the joystick module.

8 files changed, 833 insertions, 0 deletions

diff --git a/opentrack-dinput/CMakeLists.txt b/opentrack-dinput/CMakeLists.txt
new file mode 100644
index 00000000..ed0b5990
--- /dev/null
+++ b/opentrack-dinput/CMakeLists.txt
@@ -0,0 +1,4 @@
+if(WIN32)
+    opentrack_boilerplate(opentrack-dinput BIN)
+    target_link_libraries(opentrack-dinput dinput)
+endif()
diff --git a/opentrack-dinput/dinput.cpp b/opentrack-dinput/dinput.cpp
new file mode 100644
index 00000000..ce80fe0e
--- /dev/null
+++ b/opentrack-dinput/dinput.cpp
@@ -0,0 +1,47 @@
+#ifdef _WIN32
+
+#include "dinput.hpp"
+#include <QDebug>
+
+dinput_handle dinput_handle::self;
+
+dinput_handle::dinput_handle() : handle(init_di())
+{
+}
+
+dinput_handle::~dinput_handle()
+{
+    if (handle)
+    {
+        handle->Release();
+        handle = nullptr;
+    }
+}
+
+dinput_handle::di_t dinput_handle::init_di()
+{
+    HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
+    if (FAILED(hr))
+        qDebug() << "dinput: failed CoInitializeEx" << hr << GetLastError();
+
+    static LPDIRECTINPUT8 di_ = nullptr;
+    if (di_ == nullptr)
+    {
+        if (SUCCEEDED(DirectInput8Create(GetModuleHandle(NULL), DIRECTINPUT_VERSION, IID_IDirectInput8, (void**)&di_, NULL)))
+        {
+            return di_;
+        }
+        else
+        {
+            return di_ = nullptr;
+        }
+    }
+    return di_;
+}
+
+dinput_handle::di_t dinput_handle::make_di()
+{
+    return self.handle;
+}
+
+#endif
diff --git a/opentrack-dinput/dinput.hpp b/opentrack-dinput/dinput.hpp
new file mode 100644
index 00000000..db901887
--- /dev/null
+++ b/opentrack-dinput/dinput.hpp
@@ -0,0 +1,28 @@
+#pragma once
+
+#ifdef _WIN32
+
+#ifndef DIRECTINPUT_VERSION
+#   define DIRECTINPUT_VERSION 0x800
+#endif
+#include "export.hpp"
+#include <dinput.h>
+#include <windows.h>
+
+struct OPENTRACK_DINPUT_EXPORT dinput_handle final
+{
+    using di_t = LPDIRECTINPUT8;
+private:
+    static dinput_handle self;
+    dinput_handle();
+    ~dinput_handle();
+    static di_t init_di();
+    di_t handle;
+public:
+     static di_t make_di();
+
+     dinput_handle(const dinput_handle&) = delete;
+     dinput_handle(dinput_handle&&) = delete;
+};
+
+#endif
diff --git a/opentrack-dinput/export.hpp b/opentrack-dinput/export.hpp
new file mode 100644
index 00000000..51ee4531
--- /dev/null
+++ b/opentrack-dinput/export.hpp
@@ -0,0 +1,28 @@
+#pragma once
+
+#ifdef BUILD_dinput
+#   ifdef _WIN32
+#       define OPENTRACK_DINPUT_LINKAGE __declspec(dllexport)
+#   else
+#       define OPENTRACK_DINPUT_LINKAGE
+#   endif
+
+#   ifndef _MSC_VER
+#       define OPENTRACK_DINPUT_EXPORT __attribute__ ((visibility ("default"))) OPENTRACK_DINPUT_LINKAGE
+#   else
+#       define OPENTRACK_DINPUT_EXPORT OPENTRACK_DINPUT_LINKAGE
+#   endif
+
+#else
+#ifdef _WIN32
+#    define OPENTRACK_DINPUT_LINKAGE __declspec(dllimport)
+#else
+#    define OPENTRACK_DINPUT_LINKAGE
+#endif
+
+#ifndef _MSC_VER
+#    define OPENTRACK_DINPUT_EXPORT __attribute__ ((visibility ("default"))) OPENTRACK_DINPUT_LINKAGE
+#else
+#    define OPENTRACK_DINPUT_EXPORT OPENTRACK_DINPUT_LINKAGE
+#endif
+#endif
diff --git a/opentrack-dinput/keybinding-worker.cpp b/opentrack-dinput/keybinding-worker.cpp
new file mode 100644
index 00000000..a009d399
--- /dev/null
+++ b/opentrack-dinput/keybinding-worker.cpp
@@ -0,0 +1,189 @@
+/* Copyright (c) 2014-2015, Stanislaw Halik <sthalik@misaki.pl>
+
+ * Permission to use, copy, modify, and/or distribute this
+ * software for any purpose with or without fee is hereby granted,
+ * provided that the above copyright notice and this permission
+ * notice appear in all copies.
+ */
+
+#ifdef _WIN32
+
+#include "keybinding-worker.hpp"
+#include <functional>
+#include <windows.h>
+#include <QDebug>
+#include <QMutexLocker>
+
+bool Key::should_process()
+{
+    if (!enabled || (keycode == 0 && guid == ""))
+        return false;
+    bool ret = timer.elapsed_ms() > 100;
+    timer.start();
+    return ret;
+}
+
+KeybindingWorker::~KeybindingWorker()
+{
+    should_quit = true;
+    wait();
+    if (dinkeyboard) {
+        dinkeyboard->Unacquire();
+        dinkeyboard->Release();
+    }
+}
+
+KeybindingWorker::KeybindingWorker() : should_quit(true)
+{
+    LPDIRECTINPUT8 din = dinput_handle::make_di();
+
+    if (din->CreateDevice(GUID_SysKeyboard, &dinkeyboard, NULL) != DI_OK) {
+        qDebug() << "setup CreateDevice function failed!" << GetLastError();
+        return;
+    }
+
+    if (dinkeyboard->SetDataFormat(&c_dfDIKeyboard) != DI_OK) {
+        qDebug() << "setup SetDataFormat function failed!" << GetLastError();
+        dinkeyboard->Release();
+        dinkeyboard = 0;
+        return;
+    }
+
+    if (dinkeyboard->SetCooperativeLevel((HWND) fake_main_window.winId(), DISCL_NONEXCLUSIVE | DISCL_BACKGROUND) != DI_OK) {
+        dinkeyboard->Release();
+        dinkeyboard = 0;
+        qDebug() << "setup SetCooperativeLevel function failed!" << GetLastError();
+        return;
+    }
+
+    if (dinkeyboard->Acquire() != DI_OK)
+    {
+        dinkeyboard->Release();
+        dinkeyboard = 0;
+        qDebug() << "setup dinkeyboard Acquire failed!" << GetLastError();
+        return;
+    }
+
+    should_quit = false;
+    start();
+}
+
+KeybindingWorker& KeybindingWorker::make()
+{
+    static KeybindingWorker k;
+    return k;
+}
+
+void KeybindingWorker::run()
+{
+    BYTE keystate[256] = {0};
+    BYTE old_keystate[256] = {0};
+
+    while (!should_quit)
+    {
+        {
+            QMutexLocker l(&mtx);
+
+            if (receivers.size())
+            {
+                {
+                    const HRESULT hr = dinkeyboard->GetDeviceState(256, (LPVOID)keystate);
+
+                    if (hr != DI_OK) {
+                        qDebug() << "Tracker::run GetDeviceState function failed!" << GetLastError();
+                        Sleep(25);
+                        continue;
+                    }
+                }
+
+                {
+                    using joy_fn = std::function<void(const QString& guid, int idx, bool held)>;
+
+                    joy_fn f = [&](const QString& guid, int idx, bool held) -> void {
+                        Key k;
+                        k.keycode = idx;
+                        k.shift = !!(keystate[DIK_LSHIFT] & 0x80 || keystate[DIK_RSHIFT] & 0x80);
+                        k.alt = !!(keystate[DIK_LALT] & 0x80 || keystate[DIK_RALT] & 0x80);
+                        k.ctrl = !!(keystate[DIK_LCONTROL] & 0x80 || keystate[DIK_RCONTROL] & 0x80);
+                        k.guid = guid;
+                        k.held = held;
+
+                        for (auto& r : receivers)
+                            r->operator()(k);
+                    };
+
+                    joy_ctx.poll(f);
+                }
+
+                for (int i = 0; i < 256; i++)
+                {
+                    Key k;
+                    if (old_keystate[i] != keystate[i])
+                    {
+                        const bool held = keystate[i] & 0x80;
+                        switch (i)
+                        {
+                        case DIK_LCONTROL:
+                        case DIK_LSHIFT:
+                        case DIK_LALT:
+                        case DIK_RCONTROL:
+                        case DIK_RSHIFT:
+                        case DIK_RALT:
+                            break;
+                        default:
+                            k.shift = !!(keystate[DIK_LSHIFT] & 0x80) || !!(keystate[DIK_RSHIFT] & 0x80);
+                            k.alt = !!(keystate[DIK_LALT] & 0x80) || !!(keystate[DIK_RALT] & 0x80);
+                            k.ctrl = !!(keystate[DIK_LCONTROL] & 0x80) || !!(keystate[DIK_RCONTROL] & 0x80);
+                            k.keycode = i;
+                            k.held = held;
+
+                            for (auto& r : receivers)
+                                r->operator()(k);
+                            break;
+                        }
+                    }
+                    old_keystate[i] = keystate[i];
+                }
+            }
+        }
+
+        // keypresses get dropped with high values
+        Sleep(4);
+    }
+}
+
+KeybindingWorker::fun* KeybindingWorker::_add_receiver(fun& receiver)
+{
+    QMutexLocker l(&mtx);
+    receivers.push_back(std::unique_ptr<fun>(new fun(receiver)));
+    fun* f = receivers[receivers.size() - 1].get();
+    //qDebug() << "add receiver" << (long) f;
+    joy_ctx.refresh();
+    return f;
+}
+
+void KeybindingWorker::remove_receiver(KeybindingWorker::fun* pos)
+{
+    QMutexLocker l(&mtx);
+    bool ok = false;
+
+    using s = int;
+
+    for (int i = s(receivers.size()) - 1; i >= 0; i--)
+    {
+        using u = unsigned;
+        if (receivers[u(i)].get() == pos)
+        {
+            ok = true;
+            //qDebug() << "remove receiver" << (long) pos;
+            receivers.erase(receivers.begin() + i);
+            break;
+        }
+    }
+    if (!ok)
+    {
+        qDebug() << "bad remove receiver" << (long) pos;
+    }
+}
+
+#endif
diff --git a/opentrack-dinput/keybinding-worker.hpp b/opentrack-dinput/keybinding-worker.hpp
new file mode 100644
index 00000000..439d2066
--- /dev/null
+++ b/opentrack-dinput/keybinding-worker.hpp
@@ -0,0 +1,82 @@
+/* Copyright (c) 2014-2015, Stanislaw Halik <sthalik@misaki.pl>
+
+ * Permission to use, copy, modify, and/or distribute this
+ * software for any purpose with or without fee is hereby granted,
+ * provided that the above copyright notice and this permission
+ * notice appear in all copies.
+ */
+
+#pragma once
+
+#include "export.hpp"
+
+#include "opentrack-compat/timer.hpp"
+#include "win32-joystick.hpp"
+#include "dinput.hpp"
+#include <QThread>
+#include <QMutex>
+#include <QWidget>
+#include <QMainWindow>
+#include <functional>
+#include <vector>
+
+#undef DIRECTINPUT_VERSION
+#define DIRECTINPUT_VERSION 0x0800
+#include <windows.h>
+#include <dinput.h>
+
+struct OPENTRACK_DINPUT_EXPORT Key
+{
+    BYTE keycode;
+    QString guid;
+    bool shift;
+    bool ctrl;
+    bool alt;
+    bool held;
+    bool enabled;
+    Timer timer;
+public:
+    Key() : keycode(0), shift(false), ctrl(false), alt(false), held(true), enabled(true) {}
+
+    bool should_process();
+};
+
+struct OPENTRACK_DINPUT_EXPORT KeybindingWorker : private QThread
+{
+    using fun = std::function<void(const Key&)>;
+
+private:
+    LPDIRECTINPUTDEVICE8 dinkeyboard;
+    win32_joy_ctx joy_ctx;
+    std::vector<std::unique_ptr<fun>> receivers;
+    QMutex mtx;
+    QMainWindow fake_main_window;
+    volatile bool should_quit;
+
+    void run() override;
+    KeybindingWorker();
+
+    static KeybindingWorker& make();
+    fun* _add_receiver(fun &receiver);
+    void remove_receiver(fun* pos);
+    ~KeybindingWorker();
+
+    KeybindingWorker(const KeybindingWorker&) = delete;
+    KeybindingWorker& operator=(KeybindingWorker&) = delete;
+public:
+    class Token
+    {
+        fun* pos;
+        Token(const Token&) = delete;
+        Token& operator=(Token&) = delete;
+    public:
+        ~Token()
+        {
+            make().remove_receiver(pos);
+        }
+        Token(fun receiver)
+        {
+            pos = make()._add_receiver(receiver);
+        }
+    };
+};
diff --git a/opentrack-dinput/win32-joystick.cpp b/opentrack-dinput/win32-joystick.cpp
new file mode 100644
index 00000000..fa1a8060
--- /dev/null
+++ b/opentrack-dinput/win32-joystick.cpp
@@ -0,0 +1,362 @@
+#ifdef _WIN32
+
+#undef NDEBUG
+#include "win32-joystick.hpp"
+#include "opentrack-compat/sleep.hpp"
+#include <cassert>
+#include <cstring>
+#include <algorithm>
+#include <cmath>
+#include <objbase.h>
+
+QMutex win32_joy_ctx::enum_state::mtx;
+win32_joy_ctx::enum_state win32_joy_ctx::enumerator;
+
+void win32_joy_ctx::poll(fn f)
+{
+    //refresh(false);
+
+    QMutexLocker l(&enumerator.mtx);
+
+    auto& joys = enumerator.get_joys();
+
+    for (auto& j : joys)
+    {
+        j.second->poll(f);
+    }
+}
+
+bool win32_joy_ctx::poll_axis(const QString &guid, int* axes)
+{
+    QMutexLocker l(&enumerator.mtx);
+
+    for (int k = 0; k < 10; k++)
+    {
+        if (k > 0)
+            enumerator.refresh();
+
+        const joys_t& joys = enumerator.get_joys();
+        auto iter = joys.find(guid);
+
+        if (iter == joys.end())
+            return false;
+
+        auto& j = iter->second;
+
+        auto& joy_handle = j->joy_handle;
+        bool ok = false;
+        HRESULT hr;
+
+        if (!FAILED(hr = joy_handle->Poll()))
+        {
+            ok = true;
+        }
+
+        if (!ok && FAILED(hr = joy_handle->Acquire()))
+        {
+            //qDebug() << "joy acquire failed" << hr;
+        }
+
+        if (!ok)
+        {
+            portable::sleep(25);
+            (void) joy_handle->Unacquire();
+            continue;
+        }
+
+        DIJOYSTATE2 js;
+        std::memset(&js, 0, sizeof(js));
+
+        if (FAILED(hr = joy_handle->GetDeviceState(sizeof(js), &js)))
+        {
+            qDebug() << "joy get state failed" << guid << hr;
+            continue;
+        }
+
+        const int values[] =
+        {
+            js.lX,
+            js.lY,
+            js.lZ,
+            js.lRx,
+            js.lRy,
+            js.lRz,
+            js.rglSlider[0],
+            js.rglSlider[1]
+        };
+
+        for (int i = 0; i < 8; i++)
+            axes[i] = values[i];
+
+        return true;
+    }
+
+    return false;
+}
+
+std::vector<win32_joy_ctx::joy_info> win32_joy_ctx::get_joy_info()
+{
+    std::vector<joy_info> ret;
+    QMutexLocker l(&enumerator.mtx);
+    auto& joys = enumerator.get_joys();
+    ret.reserve(joys.size());
+
+    for (auto& j : joys)
+        ret.push_back(joy_info { j.second->name, j.first });
+
+    std::sort(ret.begin(), ret.end(), [&](const joy_info& fst, const joy_info& snd) -> bool { return fst.name < snd.name; });
+
+    return ret;
+}
+
+win32_joy_ctx::win32_joy_ctx()
+{
+    refresh();
+}
+
+void win32_joy_ctx::refresh()
+{
+    QMutexLocker l(&enumerator.mtx);
+    enumerator.refresh();
+}
+
+QString win32_joy_ctx::guid_to_string(const GUID guid)
+{
+    char buf[40] = {0};
+    wchar_t szGuidW[40] = {0};
+
+    StringFromGUID2(guid, szGuidW, 40);
+    WideCharToMultiByte(0, 0, szGuidW, -1, buf, 40, NULL, NULL);
+
+    return QString(buf);
+}
+
+using fn = win32_joy_ctx::fn;
+
+void win32_joy_ctx::joy::release()
+{
+    if (joy_handle)
+    {
+        (void) joy_handle->Unacquire();
+        joy_handle->Release();
+        joy_handle = nullptr;
+    }
+}
+
+bool win32_joy_ctx::joy::poll(fn f)
+{
+    HRESULT hr;
+    bool ok = false;
+
+    (void) joy_handle->Acquire();
+
+    if (!FAILED(hr = joy_handle->Poll()))
+        ok = true;
+
+    if (!ok)
+    {
+        qDebug() << "joy acquire failed" << guid << hr;
+        (void) joy_handle->Unacquire();
+        return false;
+    }
+
+    DIJOYSTATE2 js;
+    std::memset(&js, 0, sizeof(js));
+
+    if (FAILED(hr = joy_handle->GetDeviceState(sizeof(js), &js)))
+    {
+        qDebug() << "joy get state failed" << guid << hr;
+        return false;
+    }
+
+    for (unsigned i = 0; i < 4; i++)
+    {
+        using std::round;
+
+        unsigned char pos;
+        unsigned pos_ = js.rgdwPOV[i];
+        if ((pos_ & 0xffff) == 0xffff)
+            pos = 0;
+        else if (pos_ == ~0u)
+            pos = 0;
+        else
+        {
+            using uc = unsigned char;
+            pos = uc(((pos_ / 9000u) % 4u) + 1u);
+        }
+
+        const bool state[] =
+        {
+            pos == 1,
+            pos == 2,
+            pos == 3,
+            pos == 4
+        };
+
+        unsigned idx = 128u + i * 4u;
+
+        for (unsigned j = 0; j < 4; j++, idx++)
+        {
+            if (state[j] != pressed[idx])
+            {
+                f(guid, int(idx), state[j]);
+                pressed[idx] = state[j];
+            }
+        }
+    }
+
+    for (int i = 0; i < 128; i++)
+    {
+        const bool state = !!(js.rgbButtons[i] & 0x80);
+        if (state != pressed[i])
+        {
+            f(guid, i, state);
+        }
+        pressed[i] = state;
+    }
+
+    return true;
+}
+
+win32_joy_ctx::enum_state::enum_state()
+{
+}
+
+win32_joy_ctx::enum_state::~enum_state()
+{
+    QMutexLocker l(&mtx);
+
+    joys = std::unordered_map<QString, std::shared_ptr<joy>>();
+}
+
+void win32_joy_ctx::enum_state::refresh()
+{
+    all.clear();
+
+    di_t di = dinput_handle::make_di();
+    if (!di)
+    {
+        qDebug() << "can't create dinput";
+        return;
+    }
+
+    HRESULT hr;
+
+    if(FAILED(hr = di->EnumDevices(DI8DEVCLASS_GAMECTRL,
+                                   EnumJoysticksCallback,
+                                   this,
+                                   DIEDFL_ATTACHEDONLY)))
+    {
+        qDebug() << "failed enum joysticks" << hr;
+        return;
+    }
+
+    for (auto it = joys.begin(); it != joys.end(); )
+    {
+        if (std::find_if(all.cbegin(), all.cend(), [&](const QString& guid2) -> bool { return it->second->guid == guid2; }) == all.end())
+        {
+            it = joys.erase(it);
+        }
+        else
+        {
+            ++it;
+        }
+    }
+}
+
+BOOL CALLBACK win32_joy_ctx::enum_state::EnumJoysticksCallback(const DIDEVICEINSTANCE *pdidInstance, void *pContext)
+{
+    di_t di = dinput_handle::make_di();
+    if (!di)
+    {
+        qDebug() << "can't create dinput";
+        return DIENUM_STOP;
+    }
+
+    enum_state& state = *reinterpret_cast<enum_state*>(pContext);
+    const QString guid = guid_to_string(pdidInstance->guidInstance);
+    const QString name = QString(pdidInstance->tszInstanceName);
+
+    const bool exists = state.joys.find(guid) != state.joys.end();
+
+    state.all.push_back(guid);
+
+    if (exists)
+        goto end;
+
+    {
+        HRESULT hr;
+        LPDIRECTINPUTDEVICE8 h;
+        if (FAILED(hr = di->CreateDevice(pdidInstance->guidInstance, &h, nullptr)))
+        {
+            qDebug() << "createdevice" << guid << hr;
+            goto end;
+        }
+        if (FAILED(h->SetDataFormat(&c_dfDIJoystick2)))
+        {
+            qDebug() << "format";
+            h->Release();
+            goto end;
+        }
+
+        // not a static member - need main() to run for some time first
+        static const QWidget fake_window;
+
+        if (FAILED(h->SetCooperativeLevel(reinterpret_cast<HWND>(fake_window.winId()), DISCL_NONEXCLUSIVE | DISCL_BACKGROUND)))
+        {
+            qDebug() << "coop";
+            h->Release();
+            goto end;
+        }
+        if (FAILED(hr = h->EnumObjects(EnumObjectsCallback, h, DIDFT_ALL)))
+        {
+            qDebug() << "enum-objects";
+            h->Release();
+            goto end;
+        }
+
+        state.joys[guid] = std::make_shared<joy>(h, guid, name);
+    }
+end:
+    return DIENUM_CONTINUE;
+}
+
+BOOL CALLBACK win32_joy_ctx::enum_state::EnumObjectsCallback(const DIDEVICEOBJECTINSTANCE *pdidoi, void *ctx)
+{
+    if (pdidoi->dwType & DIDFT_AXIS)
+    {
+        DIPROPRANGE diprg;
+        std::memset(&diprg, 0, sizeof(diprg));
+        diprg.diph.dwSize = sizeof( DIPROPRANGE );
+        diprg.diph.dwHeaderSize = sizeof( DIPROPHEADER );
+        diprg.diph.dwHow = DIPH_BYID;
+        diprg.diph.dwObj = pdidoi->dwType;
+        diprg.lMax = joy_axis_size;
+        diprg.lMin = -joy_axis_size;
+
+        HRESULT hr;
+
+        if (FAILED(hr = reinterpret_cast<LPDIRECTINPUTDEVICE8>(ctx)->SetProperty(DIPROP_RANGE, &diprg.diph)))
+        {
+            qDebug() << "DIPROP_RANGE" << hr;
+            return DIENUM_STOP;
+        }
+    }
+
+    return DIENUM_CONTINUE;
+}
+
+win32_joy_ctx::joy::joy(LPDIRECTINPUTDEVICE8 handle, const QString &guid, const QString &name)
+    : joy_handle(handle), guid(guid), name(name)
+{
+    qDebug() << "make joy" << guid << name << joy_handle;
+    std::memset(pressed, 0, sizeof(pressed));
+}
+
+win32_joy_ctx::joy::~joy()
+{
+    qDebug() << "nix joy" << guid;
+    release();
+}
+
+#endif
diff --git a/opentrack-dinput/win32-joystick.hpp b/opentrack-dinput/win32-joystick.hpp
new file mode 100644
index 00000000..c4fcdde2
--- /dev/null
+++ b/opentrack-dinput/win32-joystick.hpp
@@ -0,0 +1,93 @@
+#pragma once
+
+#ifdef _WIN32
+
+#include "dinput.hpp"
+#include "opentrack-compat/timer.hpp"
+#include "export.hpp"
+#include <cstring>
+#include <memory>
+#include <vector>
+#include <functional>
+#include <algorithm>
+#include <unordered_map>
+#include <QString>
+#include <QDebug>
+#include <QMutex>
+#include <QMutexLocker>
+#include <QWidget>
+
+namespace std {
+template<>
+struct hash<QString>
+{
+    inline std::size_t operator()(const QString& value) const
+    {
+        return qHash(value);
+    }
+};
+}
+
+struct OPENTRACK_DINPUT_EXPORT win32_joy_ctx
+{
+    using fn = std::function<void(const QString& guid, int btn, bool held)>;
+
+    struct joy
+    {
+        LPDIRECTINPUTDEVICE8 joy_handle;
+        QString guid, name;
+        bool pressed[128 + 4 * 4];
+        Timer first_timer;
+
+        joy(LPDIRECTINPUTDEVICE8 handle, const QString& guid, const QString& name);
+        ~joy();
+
+        void release();
+        bool poll(fn f);
+    };
+
+    using joys_t = std::unordered_map<QString, std::shared_ptr<joy>>;
+
+    static constexpr int joy_axis_size = 65535;
+
+    struct joy_info
+    {
+        QString name, guid;
+    };
+
+    void poll(fn f);
+    bool poll_axis(const QString& guid, int* axes);
+    std::vector<joy_info> get_joy_info();
+
+    win32_joy_ctx(const win32_joy_ctx&) = delete;
+    win32_joy_ctx& operator=(const win32_joy_ctx&) = delete;
+
+    win32_joy_ctx();
+    void refresh();
+
+    using di_t = dinput_handle::di_t;
+
+private:
+    static QString guid_to_string(const GUID guid);
+
+    class enum_state final
+    {
+        std::vector<QString> all;
+        joys_t joys;
+
+        static BOOL CALLBACK EnumJoysticksCallback(const DIDEVICEINSTANCE* pdidInstance, VOID* pContext);
+        static BOOL CALLBACK EnumObjectsCallback(const DIDEVICEOBJECTINSTANCE* pdidoi, VOID* ctx);
+
+    public:
+        static QMutex mtx;
+
+        enum_state();
+        ~enum_state();
+        void refresh();
+        const joys_t& get_joys() const { return joys; }
+    };
+
+    static enum_state enumerator;
+};
+
+#endif