src/joystick/windows/SDL_windowsjoystick.c
author Ryan C. Gordon
Tue, 24 Mar 2015 13:52:01 -0400
changeset 9433 bd062398b648
parent 9380 07b7c1005a23
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Cleanups in the joystick code.

Removed some redundant state and other confusions.

Fixes Bugzilla #2738.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_JOYSTICK_DINPUT || SDL_JOYSTICK_XINPUT
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/* DirectInput joystick driver; written by Glenn Maynard, based on Andrei de
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 * A. Formiga's WINMM driver.
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 *
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 * Hats and sliders are completely untested; the app I'm writing this for mostly
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 * doesn't use them and I don't own any joysticks with them.
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 *
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 * We don't bother to use event notification here.  It doesn't seem to work
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 * with polled devices, and it's fine to call IDirectInputDevice8_GetDeviceData and
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 * let it return 0 events. */
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#include "SDL_error.h"
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#include "SDL_assert.h"
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#include "SDL_events.h"
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#include "SDL_thread.h"
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#include "SDL_timer.h"
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#include "SDL_mutex.h"
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#include "SDL_events.h"
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#include "SDL_hints.h"
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#include "SDL_joystick.h"
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#include "../SDL_sysjoystick.h"
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#if !SDL_EVENTS_DISABLED
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#include "../../events/SDL_events_c.h"
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#endif
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#include "../../core/windows/SDL_windows.h"
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#if !defined(__WINRT__)
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#include <dbt.h>
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#endif
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#define INITGUID /* Only set here, if set twice will cause mingw32 to break. */
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#include "SDL_windowsjoystick_c.h"
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#include "SDL_dinputjoystick_c.h"
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#include "SDL_xinputjoystick_c.h"
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#include "../../haptic/windows/SDL_dinputhaptic_c.h"    /* For haptic hot plugging */
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#include "../../haptic/windows/SDL_xinputhaptic_c.h"    /* For haptic hot plugging */
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#ifndef DEVICE_NOTIFY_WINDOW_HANDLE
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#define DEVICE_NOTIFY_WINDOW_HANDLE 0x00000000
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#endif
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/* local variables */
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static SDL_bool s_bDeviceAdded = SDL_FALSE;
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static SDL_bool s_bDeviceRemoved = SDL_FALSE;
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static SDL_JoystickID s_nInstanceID = -1;
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static SDL_cond *s_condJoystickThread = NULL;
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static SDL_mutex *s_mutexJoyStickEnum = NULL;
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static SDL_Thread *s_threadJoystick = NULL;
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static SDL_bool s_bJoystickThreadQuit = SDL_FALSE;
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JoyStick_DeviceData *SYS_Joystick;    /* array to hold joystick ID values */
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static SDL_bool s_bWindowsDeviceChanged = SDL_FALSE;
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#ifdef __WINRT__
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typedef struct
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{
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    int unused;
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} SDL_DeviceNotificationData;
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static void
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SDL_CleanupDeviceNotification(SDL_DeviceNotificationData *data)
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{
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}
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static int
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SDL_CreateDeviceNotification(SDL_DeviceNotificationData *data)
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{
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    return 0;
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}
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static void
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SDL_CheckDeviceNotification(SDL_DeviceNotificationData *data)
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{
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}
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#else /* !__WINRT__ */
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typedef struct
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{
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    HRESULT coinitialized;
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    WNDCLASSEX wincl;
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    HWND messageWindow;
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    HDEVNOTIFY hNotify;
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} SDL_DeviceNotificationData;
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/* windowproc for our joystick detect thread message only window, to detect any USB device addition/removal */
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static LRESULT CALLBACK
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SDL_PrivateJoystickDetectProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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    switch (message) {
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    case WM_DEVICECHANGE:
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        switch (wParam) {
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        case DBT_DEVICEARRIVAL:
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            if (((DEV_BROADCAST_HDR*)lParam)->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
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                s_bWindowsDeviceChanged = SDL_TRUE;
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            }
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            break;
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        case DBT_DEVICEREMOVECOMPLETE:
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            if (((DEV_BROADCAST_HDR*)lParam)->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
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                s_bWindowsDeviceChanged = SDL_TRUE;
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            }
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            break;
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        }
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        return 0;
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    }
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    return DefWindowProc (hwnd, message, wParam, lParam);
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}
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static void
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SDL_CleanupDeviceNotification(SDL_DeviceNotificationData *data)
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{
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    if (data->hNotify)
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        UnregisterDeviceNotification(data->hNotify);
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    if (data->messageWindow)
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        DestroyWindow(data->messageWindow);
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    UnregisterClass(data->wincl.lpszClassName, data->wincl.hInstance);
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    if (data->coinitialized == S_OK) {
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        WIN_CoUninitialize();
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    }
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}
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static int
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SDL_CreateDeviceNotification(SDL_DeviceNotificationData *data)
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{
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    DEV_BROADCAST_DEVICEINTERFACE dbh;
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    GUID GUID_DEVINTERFACE_HID = { 0x4D1E55B2L, 0xF16F, 0x11CF, { 0x88, 0xCB, 0x00, 0x11, 0x11, 0x00, 0x00, 0x30 } };
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    SDL_zerop(data);
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    data->coinitialized = WIN_CoInitialize();
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    data->wincl.hInstance = GetModuleHandle(NULL);
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    data->wincl.lpszClassName = L"Message";
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    data->wincl.lpfnWndProc = SDL_PrivateJoystickDetectProc;      /* This function is called by windows */
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    data->wincl.cbSize = sizeof (WNDCLASSEX);
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    if (!RegisterClassEx(&data->wincl)) {
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        WIN_SetError("Failed to create register class for joystick autodetect");
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        SDL_CleanupDeviceNotification(data);
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        return -1;
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    }
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    data->messageWindow = (HWND)CreateWindowEx(0,  L"Message", NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL);
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    if (!data->messageWindow) {
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        WIN_SetError("Failed to create message window for joystick autodetect");
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        SDL_CleanupDeviceNotification(data);
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        return -1;
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    }
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    SDL_zero(dbh);
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    dbh.dbcc_size = sizeof(dbh);
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    dbh.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
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    dbh.dbcc_classguid = GUID_DEVINTERFACE_HID;
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    data->hNotify = RegisterDeviceNotification(data->messageWindow, &dbh, DEVICE_NOTIFY_WINDOW_HANDLE);
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    if (!data->hNotify) {
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        WIN_SetError("Failed to create notify device for joystick autodetect");
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        SDL_CleanupDeviceNotification(data);
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        return -1;
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    }
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    return 0;
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}
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static void
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SDL_CheckDeviceNotification(SDL_DeviceNotificationData *data)
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{
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    MSG msg;
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    if (!data->messageWindow) {
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        return;
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    }
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    while (PeekMessage(&msg, data->messageWindow, 0, 0, PM_NOREMOVE)) {
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        if (GetMessage(&msg, data->messageWindow, 0, 0) != 0)  {
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            TranslateMessage(&msg);
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            DispatchMessage(&msg);
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        }
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    }
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}
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#endif /* __WINRT__ */
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/* Function/thread to scan the system for joysticks. */
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static int
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SDL_JoystickThread(void *_data)
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{
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    SDL_DeviceNotificationData notification_data;
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#if SDL_JOYSTICK_XINPUT
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    SDL_bool bOpenedXInputDevices[XUSER_MAX_COUNT];
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    SDL_zero(bOpenedXInputDevices);
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#endif
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    if (SDL_CreateDeviceNotification(&notification_data) < 0) {
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        return -1;
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    }
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    SDL_LockMutex(s_mutexJoyStickEnum);
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    while (s_bJoystickThreadQuit == SDL_FALSE) {
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        SDL_bool bXInputChanged = SDL_FALSE;
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        SDL_CondWaitTimeout(s_condJoystickThread, s_mutexJoyStickEnum, 300);
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        SDL_CheckDeviceNotification(&notification_data);
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#if SDL_JOYSTICK_XINPUT
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        if (SDL_XINPUT_Enabled() && XINPUTGETCAPABILITIES) {
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            /* scan for any change in XInput devices */
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            Uint8 userId;
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            for (userId = 0; userId < XUSER_MAX_COUNT; userId++) {
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                XINPUT_CAPABILITIES capabilities;
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                const DWORD result = XINPUTGETCAPABILITIES(userId, XINPUT_FLAG_GAMEPAD, &capabilities);
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                const SDL_bool available = (result == ERROR_SUCCESS);
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                if (bOpenedXInputDevices[userId] != available) {
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                    bXInputChanged = SDL_TRUE;
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                    bOpenedXInputDevices[userId] = available;
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                }
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            }
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        }
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#endif /* SDL_JOYSTICK_XINPUT */
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        if (s_bWindowsDeviceChanged || bXInputChanged) {
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            SDL_UnlockMutex(s_mutexJoyStickEnum);  /* let main thread go while we SDL_Delay(). */
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            SDL_Delay(300); /* wait for direct input to find out about this device */
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            SDL_LockMutex(s_mutexJoyStickEnum);
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            s_bDeviceRemoved = SDL_TRUE;
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            s_bDeviceAdded = SDL_TRUE;
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            s_bWindowsDeviceChanged = SDL_FALSE;
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        }
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    }
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    SDL_UnlockMutex(s_mutexJoyStickEnum);
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    SDL_CleanupDeviceNotification(&notification_data);
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    return 1;
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}
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void SDL_SYS_AddJoystickDevice(JoyStick_DeviceData *device)
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{
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    device->send_add_event = SDL_TRUE;
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    device->nInstanceID = ++s_nInstanceID;
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    device->pNext = SYS_Joystick;
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    SYS_Joystick = device;
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    s_bDeviceAdded = SDL_TRUE;
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}
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/* Function to scan the system for joysticks.
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 * Joystick 0 should be the system default joystick.
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 * It should return 0, or -1 on an unrecoverable fatal error.
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 */
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int
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SDL_SYS_JoystickInit(void)
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{
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    if (SDL_DINPUT_JoystickInit() < 0) {
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        SDL_SYS_JoystickQuit();
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        return -1;
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    }
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    if (SDL_XINPUT_JoystickInit() < 0) {
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        SDL_SYS_JoystickQuit();
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        return -1;
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    }
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    s_mutexJoyStickEnum = SDL_CreateMutex();
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    s_condJoystickThread = SDL_CreateCond();
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    s_bDeviceAdded = SDL_TRUE; /* force a scan of the system for joysticks this first time */
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    SDL_SYS_JoystickDetect();
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    if (!s_threadJoystick) {
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        s_bJoystickThreadQuit = SDL_FALSE;
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        /* spin up the thread to detect hotplug of devices */
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#if defined(__WIN32__) && !defined(HAVE_LIBC)
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#undef SDL_CreateThread
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#if SDL_DYNAMIC_API
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        s_threadJoystick= SDL_CreateThread_REAL(SDL_JoystickThread, "SDL_joystick", NULL, NULL, NULL);
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#else
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        s_threadJoystick= SDL_CreateThread(SDL_JoystickThread, "SDL_joystick", NULL, NULL, NULL);
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#endif
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#else
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        s_threadJoystick = SDL_CreateThread(SDL_JoystickThread, "SDL_joystick", NULL);
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#endif
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    }
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    return SDL_SYS_NumJoysticks();
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}
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/* return the number of joysticks that are connected right now */
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int
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SDL_SYS_NumJoysticks()
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{
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    int nJoysticks = 0;
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    JoyStick_DeviceData *device = SYS_Joystick;
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    while (device) {
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        nJoysticks++;
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        device = device->pNext;
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    }
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    return nJoysticks;
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}
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/* detect any new joysticks being inserted into the system */
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void
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SDL_SYS_JoystickDetect()
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{
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    JoyStick_DeviceData *pCurList = NULL;
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#if !SDL_EVENTS_DISABLED
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    SDL_Event event;
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#endif
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    /* only enum the devices if the joystick thread told us something changed */
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    if (!s_bDeviceAdded && !s_bDeviceRemoved) {
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        return;  /* thread hasn't signaled, nothing to do right now. */
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    }
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    SDL_LockMutex(s_mutexJoyStickEnum);
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    s_bDeviceAdded = SDL_FALSE;
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    s_bDeviceRemoved = SDL_FALSE;
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    pCurList = SYS_Joystick;
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    SYS_Joystick = NULL;
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    /* Look for DirectInput joysticks, wheels, head trackers, gamepads, etc.. */
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    SDL_DINPUT_JoystickDetect(&pCurList);
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    /* Look for XInput devices. Do this last, so they're first in the final list. */
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    SDL_XINPUT_JoystickDetect(&pCurList);
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   362
    SDL_UnlockMutex(s_mutexJoyStickEnum);
slouken@8972
   363
slouken@8972
   364
    while (pCurList) {
slouken@8972
   365
        JoyStick_DeviceData *pListNext = NULL;
slouken@8972
   366
slouken@8972
   367
        if (pCurList->bXInputDevice) {
slouken@8972
   368
            SDL_XINPUT_MaybeRemoveDevice(pCurList->XInputUserId);
slouken@8972
   369
        } else {
slouken@8972
   370
            SDL_DINPUT_MaybeRemoveDevice(&pCurList->dxdevice);
slouken@8972
   371
        }
slouken@8972
   372
slouken@8972
   373
#if !SDL_EVENTS_DISABLED
slouken@8972
   374
        SDL_zero(event);
slouken@8972
   375
        event.type = SDL_JOYDEVICEREMOVED;
slouken@8972
   376
slouken@8972
   377
        if (SDL_GetEventState(event.type) == SDL_ENABLE) {
slouken@8972
   378
            event.jdevice.which = pCurList->nInstanceID;
slouken@8972
   379
            if ((!SDL_EventOK) || (*SDL_EventOK) (SDL_EventOKParam, &event)) {
slouken@8972
   380
                SDL_PushEvent(&event);
slouken@8972
   381
            }
slouken@8972
   382
        }
slouken@8972
   383
#endif /* !SDL_EVENTS_DISABLED */
slouken@8972
   384
slouken@8972
   385
        pListNext = pCurList->pNext;
slouken@8972
   386
        SDL_free(pCurList->joystickname);
slouken@8972
   387
        SDL_free(pCurList);
slouken@8972
   388
        pCurList = pListNext;
slouken@8972
   389
    }
slouken@8972
   390
slouken@8972
   391
    if (s_bDeviceAdded) {
slouken@8972
   392
        JoyStick_DeviceData *pNewJoystick;
slouken@8972
   393
        int device_index = 0;
slouken@8972
   394
        s_bDeviceAdded = SDL_FALSE;
slouken@8972
   395
        pNewJoystick = SYS_Joystick;
slouken@8972
   396
        while (pNewJoystick) {
slouken@8972
   397
            if (pNewJoystick->send_add_event) {
slouken@8972
   398
                if (pNewJoystick->bXInputDevice) {
slouken@8972
   399
                    SDL_XINPUT_MaybeAddDevice(pNewJoystick->XInputUserId);
slouken@8972
   400
                } else {
slouken@8972
   401
                    SDL_DINPUT_MaybeAddDevice(&pNewJoystick->dxdevice);
slouken@8972
   402
                }
slouken@8972
   403
slouken@8972
   404
#if !SDL_EVENTS_DISABLED
slouken@8972
   405
                SDL_zero(event);
slouken@8972
   406
                event.type = SDL_JOYDEVICEADDED;
slouken@8972
   407
slouken@8972
   408
                if (SDL_GetEventState(event.type) == SDL_ENABLE) {
slouken@8972
   409
                    event.jdevice.which = device_index;
slouken@8972
   410
                    if ((!SDL_EventOK) || (*SDL_EventOK) (SDL_EventOKParam, &event)) {
slouken@8972
   411
                        SDL_PushEvent(&event);
slouken@8972
   412
                    }
slouken@8972
   413
                }
slouken@8972
   414
#endif /* !SDL_EVENTS_DISABLED */
slouken@8972
   415
                pNewJoystick->send_add_event = SDL_FALSE;
slouken@8972
   416
            }
slouken@8972
   417
            device_index++;
slouken@8972
   418
            pNewJoystick = pNewJoystick->pNext;
slouken@8972
   419
        }
slouken@8972
   420
    }
slouken@8972
   421
}
slouken@8972
   422
slouken@8972
   423
/* Function to get the device-dependent name of a joystick */
slouken@8972
   424
const char *
slouken@8972
   425
SDL_SYS_JoystickNameForDeviceIndex(int device_index)
slouken@8972
   426
{
slouken@8972
   427
    JoyStick_DeviceData *device = SYS_Joystick;
slouken@8972
   428
slouken@8972
   429
    for (; device_index > 0; device_index--)
slouken@8972
   430
        device = device->pNext;
slouken@8972
   431
slouken@8972
   432
    return device->joystickname;
slouken@8972
   433
}
slouken@8972
   434
slouken@8972
   435
/* Function to perform the mapping between current device instance and this joysticks instance id */
slouken@8972
   436
SDL_JoystickID
slouken@8972
   437
SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
slouken@8972
   438
{
slouken@8972
   439
    JoyStick_DeviceData *device = SYS_Joystick;
slouken@8972
   440
    int index;
slouken@8972
   441
slouken@8972
   442
    for (index = device_index; index > 0; index--)
slouken@8972
   443
        device = device->pNext;
slouken@8972
   444
slouken@8972
   445
    return device->nInstanceID;
slouken@8972
   446
}
slouken@8972
   447
slouken@8972
   448
/* Function to open a joystick for use.
philipp@9380
   449
   The joystick to open is specified by the device index.
slouken@8972
   450
   This should fill the nbuttons and naxes fields of the joystick structure.
slouken@8972
   451
   It returns 0, or -1 if there is an error.
slouken@8972
   452
 */
slouken@8972
   453
int
slouken@8972
   454
SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
slouken@8972
   455
{
slouken@8972
   456
    JoyStick_DeviceData *joystickdevice = SYS_Joystick;
slouken@8972
   457
slouken@8972
   458
    for (; device_index > 0; device_index--)
slouken@8972
   459
        joystickdevice = joystickdevice->pNext;
slouken@8972
   460
slouken@8972
   461
    /* allocate memory for system specific hardware data */
slouken@8972
   462
    joystick->instance_id = joystickdevice->nInstanceID;
slouken@8972
   463
    joystick->hwdata =
slouken@8972
   464
        (struct joystick_hwdata *) SDL_malloc(sizeof(struct joystick_hwdata));
slouken@8972
   465
    if (joystick->hwdata == NULL) {
slouken@8972
   466
        return SDL_OutOfMemory();
slouken@8972
   467
    }
slouken@8972
   468
    SDL_zerop(joystick->hwdata);
slouken@8972
   469
    joystick->hwdata->guid = joystickdevice->guid;
slouken@8972
   470
slouken@8972
   471
    if (joystickdevice->bXInputDevice) {
slouken@8972
   472
        return SDL_XINPUT_JoystickOpen(joystick, joystickdevice);
slouken@8972
   473
    } else {
slouken@8972
   474
        return SDL_DINPUT_JoystickOpen(joystick, joystickdevice);
slouken@8972
   475
    }
slouken@8972
   476
}
slouken@8972
   477
slouken@8972
   478
/* return true if this joystick is plugged in right now */
slouken@8972
   479
SDL_bool 
slouken@8972
   480
SDL_SYS_JoystickAttached(SDL_Joystick * joystick)
slouken@8972
   481
{
icculus@9433
   482
    return joystick->hwdata && !joystick->hwdata->removed;
slouken@8972
   483
}
slouken@8972
   484
slouken@8972
   485
void
slouken@8972
   486
SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
slouken@8972
   487
{
icculus@9433
   488
    if (!joystick->hwdata || joystick->hwdata->removed) {
slouken@8972
   489
        return;
slouken@8972
   490
    }
slouken@8972
   491
slouken@8972
   492
    if (joystick->hwdata->bXInputDevice) {
slouken@8972
   493
        SDL_XINPUT_JoystickUpdate(joystick);
slouken@8972
   494
    } else {
slouken@8972
   495
        SDL_DINPUT_JoystickUpdate(joystick);
slouken@8972
   496
    }
slouken@8972
   497
slouken@8972
   498
    if (joystick->hwdata->removed) {
icculus@9433
   499
        joystick->force_recentering = SDL_TRUE;
slouken@8972
   500
    }
slouken@8972
   501
}
slouken@8972
   502
slouken@8972
   503
/* Function to close a joystick after use */
slouken@8972
   504
void
slouken@8972
   505
SDL_SYS_JoystickClose(SDL_Joystick * joystick)
slouken@8972
   506
{
slouken@8972
   507
    if (joystick->hwdata->bXInputDevice) {
slouken@8972
   508
        SDL_XINPUT_JoystickClose(joystick);
slouken@8972
   509
    } else {
slouken@8972
   510
        SDL_DINPUT_JoystickClose(joystick);
slouken@8972
   511
    }
slouken@8972
   512
slouken@8972
   513
    SDL_free(joystick->hwdata);
slouken@8972
   514
}
slouken@8972
   515
slouken@8972
   516
/* Function to perform any system-specific joystick related cleanup */
slouken@8972
   517
void
slouken@8972
   518
SDL_SYS_JoystickQuit(void)
slouken@8972
   519
{
slouken@8972
   520
    JoyStick_DeviceData *device = SYS_Joystick;
slouken@8972
   521
slouken@8972
   522
    while (device) {
slouken@8972
   523
        JoyStick_DeviceData *device_next = device->pNext;
slouken@8972
   524
        SDL_free(device->joystickname);
slouken@8972
   525
        SDL_free(device);
slouken@8972
   526
        device = device_next;
slouken@8972
   527
    }
slouken@8972
   528
    SYS_Joystick = NULL;
slouken@8972
   529
slouken@8972
   530
    if (s_threadJoystick) {
slouken@8972
   531
        SDL_LockMutex(s_mutexJoyStickEnum);
slouken@8972
   532
        s_bJoystickThreadQuit = SDL_TRUE;
slouken@8972
   533
        SDL_CondBroadcast(s_condJoystickThread); /* signal the joystick thread to quit */
slouken@8972
   534
        SDL_UnlockMutex(s_mutexJoyStickEnum);
slouken@8972
   535
        SDL_WaitThread(s_threadJoystick, NULL); /* wait for it to bugger off */
slouken@8972
   536
slouken@8972
   537
        SDL_DestroyMutex(s_mutexJoyStickEnum);
slouken@8972
   538
        SDL_DestroyCond(s_condJoystickThread);
slouken@8972
   539
        s_condJoystickThread= NULL;
slouken@8972
   540
        s_mutexJoyStickEnum = NULL;
slouken@8972
   541
        s_threadJoystick = NULL;
slouken@8972
   542
    }
slouken@8972
   543
slouken@8972
   544
    SDL_DINPUT_JoystickQuit();
slouken@8972
   545
    SDL_XINPUT_JoystickQuit();
slouken@8972
   546
}
slouken@8972
   547
slouken@8972
   548
/* return the stable device guid for this device index */
slouken@8972
   549
SDL_JoystickGUID
slouken@8972
   550
SDL_SYS_JoystickGetDeviceGUID(int device_index)
slouken@8972
   551
{
slouken@8972
   552
    JoyStick_DeviceData *device = SYS_Joystick;
slouken@8972
   553
    int index;
slouken@8972
   554
slouken@8972
   555
    for (index = device_index; index > 0; index--)
slouken@8972
   556
        device = device->pNext;
slouken@8972
   557
slouken@8972
   558
    return device->guid;
slouken@8972
   559
}
slouken@8972
   560
slouken@8972
   561
SDL_JoystickGUID
slouken@8972
   562
SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
slouken@8972
   563
{
slouken@8972
   564
    return joystick->hwdata->guid;
slouken@8972
   565
}
slouken@8972
   566
slouken@8972
   567
#endif /* SDL_JOYSTICK_DINPUT || SDL_JOYSTICK_XINPUT */
slouken@8972
   568
slouken@8972
   569
/* vi: set ts=4 sw=4 expandtab: */