src/joystick/windows/SDL_mmjoystick.c
author Sam Lantinga
Mon, 26 Nov 2012 22:27:49 -0800
changeset 6698 28ab2ef7bfc9
parent 6138 4c64952a58fb
child 6707 70eeb7e3ec2f
permissions -rw-r--r--
Completed adding new hotplug stubs for the joystick implementations
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 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_config.h"
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#ifdef SDL_JOYSTICK_WINMM
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/* Win32 MultiMedia Joystick driver, contributed by Andrei de A. Formiga */
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#include "../../core/windows/SDL_windows.h"
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#include <mmsystem.h>
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#include <regstr.h>
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#include "SDL_events.h"
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#include "SDL_joystick.h"
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#include "../SDL_sysjoystick.h"
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#include "../SDL_joystick_c.h"
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#define MAX_JOYSTICKS	16
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#define MAX_AXES	6       /* each joystick can have up to 6 axes */
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#define MAX_BUTTONS	32      /* and 32 buttons                      */
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#define AXIS_MIN	-32768  /* minimum value for axis coordinate */
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#define AXIS_MAX	32767   /* maximum value for axis coordinate */
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/* limit axis to 256 possible positions to filter out noise */
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#define JOY_AXIS_THRESHOLD      (((AXIS_MAX)-(AXIS_MIN))/256)
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#define JOY_BUTTON_FLAG(n)	(1<<n)
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/* array to hold joystick ID values */
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static UINT SYS_JoystickID[MAX_JOYSTICKS];
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static JOYCAPS SYS_Joystick[MAX_JOYSTICKS];
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static char *SYS_JoystickName[MAX_JOYSTICKS];
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/* The private structure used to keep track of a joystick */
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struct joystick_hwdata
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{
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    /* joystick ID */
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    UINT id;
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    /* values used to translate device-specific coordinates into
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       SDL-standard ranges */
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    struct _transaxis
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    {
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        int offset;
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        float scale;
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    } transaxis[6];
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};
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/* Convert a Windows Multimedia API return code to a text message */
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static void SetMMerror(char *function, int code);
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static char *
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GetJoystickName(int index, const char *szRegKey)
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{
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    /* added 7/24/2004 by Eckhard Stolberg */
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    /*
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       see if there is a joystick for the current
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       index (1-16) listed in the registry
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     */
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    char *name = NULL;
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    HKEY hTopKey;
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    HKEY hKey;
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    DWORD regsize;
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    LONG regresult;
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    char regkey[256];
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    char regvalue[256];
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    char regname[256];
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    SDL_snprintf(regkey, SDL_arraysize(regkey), "%s\\%s\\%s",
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                 REGSTR_PATH_JOYCONFIG, szRegKey, REGSTR_KEY_JOYCURR);
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    hTopKey = HKEY_LOCAL_MACHINE;
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    regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
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    if (regresult != ERROR_SUCCESS) {
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        hTopKey = HKEY_CURRENT_USER;
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        regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
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    }
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    if (regresult != ERROR_SUCCESS) {
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        return NULL;
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    }
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    /* find the registry key name for the joystick's properties */
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    regsize = sizeof(regname);
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    SDL_snprintf(regvalue, SDL_arraysize(regvalue), "Joystick%d%s", index + 1,
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                 REGSTR_VAL_JOYOEMNAME);
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    regresult =
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        RegQueryValueExA(hKey, regvalue, 0, 0, (LPBYTE) regname, &regsize);
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    RegCloseKey(hKey);
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    if (regresult != ERROR_SUCCESS) {
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        return NULL;
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    }
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    /* open that registry key */
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    SDL_snprintf(regkey, SDL_arraysize(regkey), "%s\\%s", REGSTR_PATH_JOYOEM,
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                 regname);
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    regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
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    if (regresult != ERROR_SUCCESS) {
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        return NULL;
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    }
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    /* find the size for the OEM name text */
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    regsize = sizeof(regvalue);
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    regresult =
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        RegQueryValueExA(hKey, REGSTR_VAL_JOYOEMNAME, 0, 0, NULL, &regsize);
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    if (regresult == ERROR_SUCCESS) {
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        /* allocate enough memory for the OEM name text ... */
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        name = (char *) SDL_malloc(regsize);
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        if (name) {
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            /* ... and read it from the registry */
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            regresult = RegQueryValueExA(hKey,
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                                         REGSTR_VAL_JOYOEMNAME, 0, 0,
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                                         (LPBYTE) name, &regsize);
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        }
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    }
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    RegCloseKey(hKey);
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    return (name);
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}
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static int SDL_SYS_numjoysticks = 0;
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/* Function to scan the system for joysticks.
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 * This function should set SDL_numjoysticks to the number of available
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 * joysticks.  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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    int i;
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    int maxdevs;
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    JOYINFOEX joyinfo;
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    JOYCAPS joycaps;
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    MMRESULT result;
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    /* Reset the joystick ID & name mapping tables */
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    for (i = 0; i < MAX_JOYSTICKS; ++i) {
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        SYS_JoystickID[i] = 0;
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        SYS_JoystickName[i] = NULL;
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    }
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    /* Loop over all potential joystick devices */
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    SDL_SYS_numjoysticks = 0;
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    maxdevs = joyGetNumDevs();
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    for (i = JOYSTICKID1; i < maxdevs && SDL_SYS_numjoysticks < MAX_JOYSTICKS; ++i) {
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        joyinfo.dwSize = sizeof(joyinfo);
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        joyinfo.dwFlags = JOY_RETURNALL;
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        result = joyGetPosEx(i, &joyinfo);
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        if (result == JOYERR_NOERROR) {
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            result = joyGetDevCaps(i, &joycaps, sizeof(joycaps));
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            if (result == JOYERR_NOERROR) {
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                SYS_JoystickID[SDL_SYS_numjoysticks] = i;
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                SYS_Joystick[SDL_SYS_numjoysticks] = joycaps;
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                SYS_JoystickName[SDL_SYS_numjoysticks] =
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                    GetJoystickName(i, joycaps.szRegKey);
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                SDL_SYS_numjoysticks++;
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            }
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        }
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    }
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    return (SDL_SYS_numjoysticks);
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}
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/* Function to get the device-dependent name of a joystick */
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const char *
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SDL_SYS_JoystickNameForIndex(int index)
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{
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    if (SYS_JoystickName[index] != NULL) {
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        return (SYS_JoystickName[index]);
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    } else {
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        return (SYS_Joystick[index].szPname);
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    }
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}
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/* Function to open a joystick for use.
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   The joystick to open is specified by the index field of the joystick.
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   This should fill the nbuttons and naxes fields of the joystick structure.
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   It returns 0, or -1 if there is an error.
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 */
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int
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SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
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{
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    int index, i;
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    int caps_flags[MAX_AXES - 2] =
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        { JOYCAPS_HASZ, JOYCAPS_HASR, JOYCAPS_HASU, JOYCAPS_HASV };
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    int axis_min[MAX_AXES], axis_max[MAX_AXES];
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    /* shortcut */
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    index = device_index;
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    axis_min[0] = SYS_Joystick[index].wXmin;
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    axis_max[0] = SYS_Joystick[index].wXmax;
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    axis_min[1] = SYS_Joystick[index].wYmin;
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    axis_max[1] = SYS_Joystick[index].wYmax;
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    axis_min[2] = SYS_Joystick[index].wZmin;
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    axis_max[2] = SYS_Joystick[index].wZmax;
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    axis_min[3] = SYS_Joystick[index].wRmin;
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    axis_max[3] = SYS_Joystick[index].wRmax;
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    axis_min[4] = SYS_Joystick[index].wUmin;
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    axis_max[4] = SYS_Joystick[index].wUmax;
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    axis_min[5] = SYS_Joystick[index].wVmin;
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    axis_max[5] = SYS_Joystick[index].wVmax;
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    /* allocate memory for system specific hardware data */
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    joystick->instance_id = device_index;
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    joystick->hwdata =
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        (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata));
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    if (joystick->hwdata == NULL) {
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        SDL_OutOfMemory();
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        return (-1);
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    }
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    SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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    /* set hardware data */
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    joystick->hwdata->id = SYS_JoystickID[index];
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    for (i = 0; i < MAX_AXES; ++i) {
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        if ((i < 2) || (SYS_Joystick[index].wCaps & caps_flags[i - 2])) {
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            joystick->hwdata->transaxis[i].offset = AXIS_MIN - axis_min[i];
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            joystick->hwdata->transaxis[i].scale =
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                (float) (AXIS_MAX - AXIS_MIN) / (axis_max[i] - axis_min[i]);
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        } else {
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            joystick->hwdata->transaxis[i].offset = 0;
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            joystick->hwdata->transaxis[i].scale = 1.0; /* Just in case */
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        }
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    }
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    /* fill nbuttons, naxes, and nhats fields */
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    joystick->nbuttons = SYS_Joystick[index].wNumButtons;
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    joystick->naxes = SYS_Joystick[index].wNumAxes;
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    if (SYS_Joystick[index].wCaps & JOYCAPS_HASPOV) {
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        joystick->nhats = 1;
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    } else {
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        joystick->nhats = 0;
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    }
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    return (0);
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}
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static Uint8
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TranslatePOV(DWORD value)
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{
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    Uint8 pos;
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    pos = SDL_HAT_CENTERED;
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    if (value != JOY_POVCENTERED) {
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        if ((value > JOY_POVLEFT) || (value < JOY_POVRIGHT)) {
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            pos |= SDL_HAT_UP;
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        }
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        if ((value > JOY_POVFORWARD) && (value < JOY_POVBACKWARD)) {
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            pos |= SDL_HAT_RIGHT;
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        }
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        if ((value > JOY_POVRIGHT) && (value < JOY_POVLEFT)) {
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            pos |= SDL_HAT_DOWN;
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        }
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        if (value > JOY_POVBACKWARD) {
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            pos |= SDL_HAT_LEFT;
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        }
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    }
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    return (pos);
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}
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/* Function to update the state of a joystick - called as a device poll.
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 * This function shouldn't update the joystick structure directly,
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 * but instead should call SDL_PrivateJoystick*() to deliver events
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 * and update joystick device state.
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 */
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void
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SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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{
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    MMRESULT result;
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    int i;
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    DWORD flags[MAX_AXES] = { JOY_RETURNX, JOY_RETURNY, JOY_RETURNZ,
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        JOY_RETURNR, JOY_RETURNU, JOY_RETURNV
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    };
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    DWORD pos[MAX_AXES];
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    struct _transaxis *transaxis;
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    int value, change;
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    JOYINFOEX joyinfo;
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    joyinfo.dwSize = sizeof(joyinfo);
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    joyinfo.dwFlags = JOY_RETURNALL | JOY_RETURNPOVCTS;
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    if (!joystick->hats) {
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        joyinfo.dwFlags &= ~(JOY_RETURNPOV | JOY_RETURNPOVCTS);
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    }
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    result = joyGetPosEx(joystick->hwdata->id, &joyinfo);
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    if (result != JOYERR_NOERROR) {
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        SetMMerror("joyGetPosEx", result);
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        return;
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    }
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    /* joystick motion events */
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    pos[0] = joyinfo.dwXpos;
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    pos[1] = joyinfo.dwYpos;
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    pos[2] = joyinfo.dwZpos;
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    pos[3] = joyinfo.dwRpos;
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    pos[4] = joyinfo.dwUpos;
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    pos[5] = joyinfo.dwVpos;
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    transaxis = joystick->hwdata->transaxis;
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    for (i = 0; i < joystick->naxes; i++) {
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        if (joyinfo.dwFlags & flags[i]) {
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            value =
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                (int) (((float) pos[i] +
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                        transaxis[i].offset) * transaxis[i].scale);
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            change = (value - joystick->axes[i]);
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            if ((change < -JOY_AXIS_THRESHOLD)
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                || (change > JOY_AXIS_THRESHOLD)) {
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                SDL_PrivateJoystickAxis(joystick, (Uint8) i, (Sint16) value);
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            }
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        }
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    }
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    /* joystick button events */
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    if (joyinfo.dwFlags & JOY_RETURNBUTTONS) {
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        for (i = 0; i < joystick->nbuttons; ++i) {
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            if (joyinfo.dwButtons & JOY_BUTTON_FLAG(i)) {
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                if (!joystick->buttons[i]) {
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                    SDL_PrivateJoystickButton(joystick, (Uint8) i,
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                                              SDL_PRESSED);
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                }
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            } else {
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                if (joystick->buttons[i]) {
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                    SDL_PrivateJoystickButton(joystick, (Uint8) i,
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                                              SDL_RELEASED);
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                }
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   343
            }
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   344
        }
slouken@1895
   345
    }
slouken@0
   346
slouken@1895
   347
    /* joystick hat events */
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   348
    if (joyinfo.dwFlags & JOY_RETURNPOV) {
slouken@1895
   349
        Uint8 pos;
slouken@0
   350
slouken@1895
   351
        pos = TranslatePOV(joyinfo.dwPOV);
slouken@1895
   352
        if (pos != joystick->hats[0]) {
slouken@1895
   353
            SDL_PrivateJoystickHat(joystick, 0, pos);
slouken@1895
   354
        }
slouken@1895
   355
    }
slouken@0
   356
}
slouken@0
   357
slouken@0
   358
/* Function to close a joystick after use */
slouken@1895
   359
void
slouken@1895
   360
SDL_SYS_JoystickClose(SDL_Joystick * joystick)
slouken@0
   361
{
slouken@1895
   362
    if (joystick->hwdata != NULL) {
slouken@1895
   363
        /* free system specific hardware data */
slouken@1895
   364
        SDL_free(joystick->hwdata);
icculus@3610
   365
        joystick->hwdata = NULL;
slouken@1895
   366
    }
slouken@0
   367
}
slouken@0
   368
slouken@0
   369
/* Function to perform any system-specific joystick related cleanup */
slouken@1895
   370
void
slouken@1895
   371
SDL_SYS_JoystickQuit(void)
slouken@0
   372
{
slouken@1895
   373
    int i;
slouken@1895
   374
    for (i = 0; i < MAX_JOYSTICKS; i++) {
slouken@1895
   375
        if (SYS_JoystickName[i] != NULL) {
slouken@1895
   376
            SDL_free(SYS_JoystickName[i]);
icculus@3610
   377
            SYS_JoystickName[i] = NULL;
slouken@1895
   378
        }
slouken@1895
   379
    }
slouken@0
   380
}
slouken@0
   381
slouken@6698
   382
/* Function to perform the mapping from device index to the instance id for this index */
slouken@6698
   383
SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int index)
slouken@6698
   384
{
slouken@6698
   385
    return index;
slouken@6698
   386
}
slouken@6698
   387
slouken@6698
   388
/* Function to determine is this joystick is attached to the system right now */
slouken@6698
   389
int SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
slouken@6698
   390
{
slouken@6698
   391
    return 1;
slouken@6698
   392
}
slouken@6698
   393
slouken@6698
   394
int SDL_SYS_NumJoysticks()
slouken@6698
   395
{
slouken@6698
   396
    return SDL_SYS_numjoysticks;
slouken@6698
   397
}
slouken@6698
   398
slouken@6698
   399
int SDL_SYS_JoystickNeedsPolling()
slouken@6698
   400
{
slouken@6698
   401
    return 0;
slouken@6698
   402
}
slouken@6698
   403
slouken@6698
   404
void SDL_SYS_JoystickDetect()
slouken@6698
   405
{
slouken@6698
   406
}
slouken@6698
   407
slouken@6698
   408
JoystickGUID SDL_SYS_PrivateJoystickGetDeviceGUID( int device_index )
slouken@6698
   409
{
slouken@6698
   410
    JoystickGUID guid;
slouken@6698
   411
    // the GUID is just the first 16 chars of the name for now
slouken@6698
   412
    const char *name = SDL_SYS_JoystickNameForIndex( device_index );
slouken@6698
   413
    SDL_zero( guid );
slouken@6698
   414
    SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
slouken@6698
   415
    return guid;
slouken@6698
   416
}
slouken@6698
   417
slouken@6698
   418
slouken@6698
   419
JoystickGUID SDL_SYS_PrivateJoystickGetGUID(SDL_Joystick * joystick)
slouken@6698
   420
{
slouken@6698
   421
    JoystickGUID guid;
slouken@6698
   422
    // the GUID is just the first 16 chars of the name for now
slouken@6698
   423
    const char *name = joystick->name;
slouken@6698
   424
    SDL_zero( guid );
slouken@6698
   425
    SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
slouken@6698
   426
    return guid;
slouken@6698
   427
}
slouken@6698
   428
slouken@0
   429
slouken@0
   430
/* implementation functions */
slouken@1895
   431
void
slouken@1895
   432
SetMMerror(char *function, int code)
slouken@0
   433
{
slouken@1895
   434
    static char *error;
slouken@1895
   435
    static char errbuf[1024];
slouken@0
   436
slouken@1895
   437
    errbuf[0] = 0;
slouken@1895
   438
    switch (code) {
slouken@1895
   439
    case MMSYSERR_NODRIVER:
slouken@1895
   440
        error = "Joystick driver not present";
slouken@1895
   441
        break;
slouken@1895
   442
slouken@1895
   443
    case MMSYSERR_INVALPARAM:
slouken@1895
   444
    case JOYERR_PARMS:
slouken@1895
   445
        error = "Invalid parameter(s)";
slouken@1895
   446
        break;
slouken@1895
   447
slouken@1895
   448
    case MMSYSERR_BADDEVICEID:
slouken@1895
   449
        error = "Bad device ID";
slouken@1895
   450
        break;
slouken@0
   451
slouken@1895
   452
    case JOYERR_UNPLUGGED:
slouken@1895
   453
        error = "Joystick not attached";
slouken@1895
   454
        break;
slouken@0
   455
slouken@1895
   456
    case JOYERR_NOCANDO:
slouken@1895
   457
        error = "Can't capture joystick input";
slouken@1895
   458
        break;
slouken@0
   459
slouken@1895
   460
    default:
slouken@1895
   461
        SDL_snprintf(errbuf, SDL_arraysize(errbuf),
slouken@1895
   462
                     "%s: Unknown Multimedia system error: 0x%x",
slouken@1895
   463
                     function, code);
slouken@1895
   464
        break;
slouken@1895
   465
    }
slouken@0
   466
slouken@1895
   467
    if (!errbuf[0]) {
slouken@1895
   468
        SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: %s", function,
slouken@1895
   469
                     error);
slouken@1895
   470
    }
slouken@1895
   471
    SDL_SetError("%s", errbuf);
slouken@0
   472
}
slouken@1635
   473
slouken@1635
   474
#endif /* SDL_JOYSTICK_WINMM */
slouken@1895
   475
/* vi: set ts=4 sw=4 expandtab: */