src/joystick/windows/SDL_mmjoystick.c
author Sam Lantinga
Tue, 27 Nov 2012 00:58:12 -0800
changeset 6707 70eeb7e3ec2f
parent 6698 28ab2ef7bfc9
child 6738 b408d5a406a3
permissions -rw-r--r--
Organized joystick hotplug code a bit.
Cleaned up names, return types, etc.
slouken@0
     1
/*
slouken@5535
     2
  Simple DirectMedia Layer
slouken@6138
     3
  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
slouken@0
     4
slouken@5535
     5
  This software is provided 'as-is', without any express or implied
slouken@5535
     6
  warranty.  In no event will the authors be held liable for any damages
slouken@5535
     7
  arising from the use of this software.
slouken@0
     8
slouken@5535
     9
  Permission is granted to anyone to use this software for any purpose,
slouken@5535
    10
  including commercial applications, and to alter it and redistribute it
slouken@5535
    11
  freely, subject to the following restrictions:
slouken@0
    12
slouken@5535
    13
  1. The origin of this software must not be misrepresented; you must not
slouken@5535
    14
     claim that you wrote the original software. If you use this software
slouken@5535
    15
     in a product, an acknowledgment in the product documentation would be
slouken@5535
    16
     appreciated but is not required.
slouken@5535
    17
  2. Altered source versions must be plainly marked as such, and must not be
slouken@5535
    18
     misrepresented as being the original software.
slouken@5535
    19
  3. This notice may not be removed or altered from any source distribution.
slouken@0
    20
*/
slouken@1402
    21
#include "SDL_config.h"
slouken@0
    22
slouken@1635
    23
#ifdef SDL_JOYSTICK_WINMM
slouken@1635
    24
slouken@0
    25
/* Win32 MultiMedia Joystick driver, contributed by Andrei de A. Formiga */
slouken@0
    26
slouken@5090
    27
#include "../../core/windows/SDL_windows.h"
slouken@1358
    28
#include <mmsystem.h>
slouken@1358
    29
#include <regstr.h>
slouken@1358
    30
slouken@1330
    31
#include "SDL_events.h"
slouken@0
    32
#include "SDL_joystick.h"
slouken@1361
    33
#include "../SDL_sysjoystick.h"
slouken@1361
    34
#include "../SDL_joystick_c.h"
slouken@0
    35
slouken@531
    36
#define MAX_JOYSTICKS	16
slouken@1895
    37
#define MAX_AXES	6       /* each joystick can have up to 6 axes */
slouken@1895
    38
#define MAX_BUTTONS	32      /* and 32 buttons                      */
slouken@0
    39
#define AXIS_MIN	-32768  /* minimum value for axis coordinate */
slouken@0
    40
#define AXIS_MAX	32767   /* maximum value for axis coordinate */
slouken@834
    41
/* limit axis to 256 possible positions to filter out noise */
slouken@834
    42
#define JOY_AXIS_THRESHOLD      (((AXIS_MAX)-(AXIS_MIN))/256)
slouken@0
    43
#define JOY_BUTTON_FLAG(n)	(1<<n)
slouken@0
    44
slouken@0
    45
slouken@0
    46
/* array to hold joystick ID values */
slouken@1895
    47
static UINT SYS_JoystickID[MAX_JOYSTICKS];
slouken@1895
    48
static JOYCAPS SYS_Joystick[MAX_JOYSTICKS];
slouken@1895
    49
static char *SYS_JoystickName[MAX_JOYSTICKS];
slouken@0
    50
slouken@0
    51
/* The private structure used to keep track of a joystick */
slouken@0
    52
struct joystick_hwdata
slouken@0
    53
{
slouken@1895
    54
    /* joystick ID */
slouken@1895
    55
    UINT id;
slouken@0
    56
slouken@1895
    57
    /* values used to translate device-specific coordinates into
slouken@1895
    58
       SDL-standard ranges */
slouken@1895
    59
    struct _transaxis
slouken@1895
    60
    {
slouken@1895
    61
        int offset;
slouken@1895
    62
        float scale;
slouken@1895
    63
    } transaxis[6];
slouken@0
    64
};
slouken@0
    65
slouken@5062
    66
/* Convert a Windows Multimedia API return code to a text message */
slouken@0
    67
static void SetMMerror(char *function, int code);
slouken@0
    68
slouken@0
    69
slouken@1895
    70
static char *
slouken@1895
    71
GetJoystickName(int index, const char *szRegKey)
slouken@937
    72
{
slouken@1895
    73
    /* added 7/24/2004 by Eckhard Stolberg */
slouken@1895
    74
    /*
slouken@1895
    75
       see if there is a joystick for the current
slouken@1895
    76
       index (1-16) listed in the registry
slouken@1895
    77
     */
slouken@1895
    78
    char *name = NULL;
slouken@2176
    79
    HKEY hTopKey;
slouken@1895
    80
    HKEY hKey;
slouken@1895
    81
    DWORD regsize;
slouken@1895
    82
    LONG regresult;
slouken@2176
    83
    char regkey[256];
slouken@2176
    84
    char regvalue[256];
slouken@2176
    85
    char regname[256];
slouken@2176
    86
slouken@2176
    87
    SDL_snprintf(regkey, SDL_arraysize(regkey), "%s\\%s\\%s",
slouken@2176
    88
                 REGSTR_PATH_JOYCONFIG, szRegKey, REGSTR_KEY_JOYCURR);
slouken@2176
    89
    hTopKey = HKEY_LOCAL_MACHINE;
slouken@2176
    90
    regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
slouken@2176
    91
    if (regresult != ERROR_SUCCESS) {
slouken@2176
    92
        hTopKey = HKEY_CURRENT_USER;
slouken@2176
    93
        regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
slouken@2176
    94
    }
slouken@2176
    95
    if (regresult != ERROR_SUCCESS) {
slouken@2176
    96
        return NULL;
slouken@2176
    97
    }
slouken@937
    98
slouken@2176
    99
    /* find the registry key name for the joystick's properties */
slouken@2176
   100
    regsize = sizeof(regname);
slouken@2176
   101
    SDL_snprintf(regvalue, SDL_arraysize(regvalue), "Joystick%d%s", index + 1,
slouken@2176
   102
                 REGSTR_VAL_JOYOEMNAME);
slouken@2176
   103
    regresult =
slouken@2176
   104
        RegQueryValueExA(hKey, regvalue, 0, 0, (LPBYTE) regname, &regsize);
slouken@2176
   105
    RegCloseKey(hKey);
slouken@2176
   106
slouken@2176
   107
    if (regresult != ERROR_SUCCESS) {
slouken@2176
   108
        return NULL;
slouken@2176
   109
    }
slouken@2176
   110
slouken@2176
   111
    /* open that registry key */
slouken@2176
   112
    SDL_snprintf(regkey, SDL_arraysize(regkey), "%s\\%s", REGSTR_PATH_JOYOEM,
slouken@2176
   113
                 regname);
slouken@2176
   114
    regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
slouken@2176
   115
    if (regresult != ERROR_SUCCESS) {
slouken@2176
   116
        return NULL;
slouken@2176
   117
    }
slouken@2176
   118
slouken@2176
   119
    /* find the size for the OEM name text */
slouken@2176
   120
    regsize = sizeof(regvalue);
slouken@2176
   121
    regresult =
slouken@2176
   122
        RegQueryValueExA(hKey, REGSTR_VAL_JOYOEMNAME, 0, 0, NULL, &regsize);
slouken@1895
   123
    if (regresult == ERROR_SUCCESS) {
slouken@2176
   124
        /* allocate enough memory for the OEM name text ... */
slouken@2176
   125
        name = (char *) SDL_malloc(regsize);
slouken@2176
   126
        if (name) {
slouken@2176
   127
            /* ... and read it from the registry */
slouken@2176
   128
            regresult = RegQueryValueExA(hKey,
slouken@1895
   129
                                         REGSTR_VAL_JOYOEMNAME, 0, 0,
slouken@2176
   130
                                         (LPBYTE) name, &regsize);
slouken@1895
   131
        }
slouken@1895
   132
    }
slouken@2176
   133
    RegCloseKey(hKey);
slouken@2176
   134
slouken@1895
   135
    return (name);
slouken@937
   136
}
slouken@937
   137
slouken@6698
   138
static int SDL_SYS_numjoysticks = 0;
slouken@6698
   139
slouken@0
   140
/* Function to scan the system for joysticks.
slouken@0
   141
 * This function should set SDL_numjoysticks to the number of available
slouken@0
   142
 * joysticks.  Joystick 0 should be the system default joystick.
slouken@0
   143
 * It should return 0, or -1 on an unrecoverable fatal error.
slouken@0
   144
 */
slouken@1895
   145
int
slouken@1895
   146
SDL_SYS_JoystickInit(void)
slouken@0
   147
{
slouken@1895
   148
    int i;
slouken@1895
   149
    int maxdevs;
slouken@1895
   150
    JOYINFOEX joyinfo;
slouken@1895
   151
    JOYCAPS joycaps;
slouken@1895
   152
    MMRESULT result;
slouken@0
   153
slouken@1895
   154
    /* Reset the joystick ID & name mapping tables */
slouken@1895
   155
    for (i = 0; i < MAX_JOYSTICKS; ++i) {
slouken@1895
   156
        SYS_JoystickID[i] = 0;
slouken@1895
   157
        SYS_JoystickName[i] = NULL;
slouken@1895
   158
    }
slouken@531
   159
slouken@1895
   160
    /* Loop over all potential joystick devices */
slouken@6698
   161
    SDL_SYS_numjoysticks = 0;
slouken@1895
   162
    maxdevs = joyGetNumDevs();
slouken@6698
   163
    for (i = JOYSTICKID1; i < maxdevs && SDL_SYS_numjoysticks < MAX_JOYSTICKS; ++i) {
slouken@1895
   164
slouken@1895
   165
        joyinfo.dwSize = sizeof(joyinfo);
slouken@1895
   166
        joyinfo.dwFlags = JOY_RETURNALL;
icculus@2061
   167
        result = joyGetPosEx(i, &joyinfo);
slouken@1895
   168
        if (result == JOYERR_NOERROR) {
slouken@1895
   169
            result = joyGetDevCaps(i, &joycaps, sizeof(joycaps));
slouken@1895
   170
            if (result == JOYERR_NOERROR) {
slouken@6698
   171
                SYS_JoystickID[SDL_SYS_numjoysticks] = i;
slouken@6698
   172
                SYS_Joystick[SDL_SYS_numjoysticks] = joycaps;
slouken@6698
   173
                SYS_JoystickName[SDL_SYS_numjoysticks] =
slouken@1895
   174
                    GetJoystickName(i, joycaps.szRegKey);
slouken@6698
   175
                SDL_SYS_numjoysticks++;
slouken@1895
   176
            }
slouken@1895
   177
        }
slouken@1895
   178
    }
slouken@6698
   179
    return (SDL_SYS_numjoysticks);
slouken@0
   180
}
slouken@0
   181
slouken@6707
   182
int SDL_SYS_NumJoysticks()
slouken@6707
   183
{
slouken@6707
   184
    return SDL_SYS_numjoysticks;
slouken@6707
   185
}
slouken@6707
   186
slouken@6707
   187
void SDL_SYS_JoystickDetect()
slouken@6707
   188
{
slouken@6707
   189
}
slouken@6707
   190
slouken@6707
   191
SDL_bool SDL_SYS_JoystickNeedsPolling()
slouken@6707
   192
{
slouken@6707
   193
    return SDL_FALSE;
slouken@6707
   194
}
slouken@6707
   195
slouken@0
   196
/* Function to get the device-dependent name of a joystick */
slouken@1895
   197
const char *
slouken@6707
   198
SDL_SYS_JoystickNameForDeviceIndex(int device_index)
slouken@0
   199
{
slouken@6707
   200
    if (SYS_JoystickName[device_index] != NULL) {
slouken@6707
   201
        return (SYS_JoystickName[device_index]);
slouken@1895
   202
    } else {
slouken@6707
   203
        return (SYS_Joystick[device_index].szPname);
slouken@1895
   204
    }
slouken@0
   205
}
slouken@0
   206
slouken@6707
   207
/* Function to perform the mapping from device index to the instance id for this index */
slouken@6707
   208
SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
slouken@6707
   209
{
slouken@6707
   210
    return device_index;
slouken@6707
   211
}
slouken@6707
   212
slouken@0
   213
/* Function to open a joystick for use.
slouken@0
   214
   The joystick to open is specified by the index field of the joystick.
slouken@0
   215
   This should fill the nbuttons and naxes fields of the joystick structure.
slouken@0
   216
   It returns 0, or -1 if there is an error.
slouken@0
   217
 */
slouken@1895
   218
int
slouken@6698
   219
SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
slouken@0
   220
{
slouken@1895
   221
    int index, i;
slouken@1895
   222
    int caps_flags[MAX_AXES - 2] =
slouken@1895
   223
        { JOYCAPS_HASZ, JOYCAPS_HASR, JOYCAPS_HASU, JOYCAPS_HASV };
slouken@1895
   224
    int axis_min[MAX_AXES], axis_max[MAX_AXES];
slouken@0
   225
slouken@0
   226
slouken@1895
   227
    /* shortcut */
slouken@6698
   228
    index = device_index;
slouken@1895
   229
    axis_min[0] = SYS_Joystick[index].wXmin;
slouken@1895
   230
    axis_max[0] = SYS_Joystick[index].wXmax;
slouken@1895
   231
    axis_min[1] = SYS_Joystick[index].wYmin;
slouken@1895
   232
    axis_max[1] = SYS_Joystick[index].wYmax;
slouken@1895
   233
    axis_min[2] = SYS_Joystick[index].wZmin;
slouken@1895
   234
    axis_max[2] = SYS_Joystick[index].wZmax;
slouken@1895
   235
    axis_min[3] = SYS_Joystick[index].wRmin;
slouken@1895
   236
    axis_max[3] = SYS_Joystick[index].wRmax;
slouken@1895
   237
    axis_min[4] = SYS_Joystick[index].wUmin;
slouken@1895
   238
    axis_max[4] = SYS_Joystick[index].wUmax;
slouken@1895
   239
    axis_min[5] = SYS_Joystick[index].wVmin;
slouken@1895
   240
    axis_max[5] = SYS_Joystick[index].wVmax;
slouken@0
   241
slouken@1895
   242
    /* allocate memory for system specific hardware data */
slouken@6698
   243
    joystick->instance_id = device_index;
slouken@1895
   244
    joystick->hwdata =
slouken@1895
   245
        (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata));
slouken@1895
   246
    if (joystick->hwdata == NULL) {
slouken@1895
   247
        SDL_OutOfMemory();
slouken@1895
   248
        return (-1);
slouken@1895
   249
    }
slouken@1895
   250
    SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
slouken@0
   251
slouken@1895
   252
    /* set hardware data */
slouken@1895
   253
    joystick->hwdata->id = SYS_JoystickID[index];
slouken@1895
   254
    for (i = 0; i < MAX_AXES; ++i) {
slouken@1895
   255
        if ((i < 2) || (SYS_Joystick[index].wCaps & caps_flags[i - 2])) {
slouken@1895
   256
            joystick->hwdata->transaxis[i].offset = AXIS_MIN - axis_min[i];
slouken@1895
   257
            joystick->hwdata->transaxis[i].scale =
slouken@1895
   258
                (float) (AXIS_MAX - AXIS_MIN) / (axis_max[i] - axis_min[i]);
slouken@1895
   259
        } else {
slouken@1895
   260
            joystick->hwdata->transaxis[i].offset = 0;
slouken@1895
   261
            joystick->hwdata->transaxis[i].scale = 1.0; /* Just in case */
slouken@1895
   262
        }
slouken@1895
   263
    }
slouken@1895
   264
slouken@1895
   265
    /* fill nbuttons, naxes, and nhats fields */
slouken@1895
   266
    joystick->nbuttons = SYS_Joystick[index].wNumButtons;
slouken@1895
   267
    joystick->naxes = SYS_Joystick[index].wNumAxes;
slouken@1895
   268
    if (SYS_Joystick[index].wCaps & JOYCAPS_HASPOV) {
slouken@1895
   269
        joystick->nhats = 1;
slouken@1895
   270
    } else {
slouken@1895
   271
        joystick->nhats = 0;
slouken@1895
   272
    }
slouken@1895
   273
    return (0);
slouken@0
   274
}
slouken@0
   275
slouken@6707
   276
/* Function to determine is this joystick is attached to the system right now */
slouken@6707
   277
SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
slouken@6707
   278
{
slouken@6707
   279
    return SDL_TRUE;
slouken@6707
   280
}
slouken@6707
   281
slouken@1895
   282
static Uint8
slouken@1895
   283
TranslatePOV(DWORD value)
slouken@0
   284
{
slouken@1895
   285
    Uint8 pos;
slouken@0
   286
slouken@1895
   287
    pos = SDL_HAT_CENTERED;
slouken@1895
   288
    if (value != JOY_POVCENTERED) {
slouken@1895
   289
        if ((value > JOY_POVLEFT) || (value < JOY_POVRIGHT)) {
slouken@1895
   290
            pos |= SDL_HAT_UP;
slouken@1895
   291
        }
slouken@1895
   292
        if ((value > JOY_POVFORWARD) && (value < JOY_POVBACKWARD)) {
slouken@1895
   293
            pos |= SDL_HAT_RIGHT;
slouken@1895
   294
        }
slouken@1895
   295
        if ((value > JOY_POVRIGHT) && (value < JOY_POVLEFT)) {
slouken@1895
   296
            pos |= SDL_HAT_DOWN;
slouken@1895
   297
        }
slouken@1895
   298
        if (value > JOY_POVBACKWARD) {
slouken@1895
   299
            pos |= SDL_HAT_LEFT;
slouken@1895
   300
        }
slouken@1895
   301
    }
slouken@1895
   302
    return (pos);
slouken@0
   303
}
slouken@0
   304
slouken@0
   305
/* Function to update the state of a joystick - called as a device poll.
slouken@0
   306
 * This function shouldn't update the joystick structure directly,
slouken@0
   307
 * but instead should call SDL_PrivateJoystick*() to deliver events
slouken@0
   308
 * and update joystick device state.
slouken@0
   309
 */
slouken@1895
   310
void
slouken@1895
   311
SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
slouken@0
   312
{
slouken@1895
   313
    MMRESULT result;
slouken@1895
   314
    int i;
slouken@1895
   315
    DWORD flags[MAX_AXES] = { JOY_RETURNX, JOY_RETURNY, JOY_RETURNZ,
slouken@1895
   316
        JOY_RETURNR, JOY_RETURNU, JOY_RETURNV
slouken@1895
   317
    };
slouken@1895
   318
    DWORD pos[MAX_AXES];
slouken@1895
   319
    struct _transaxis *transaxis;
slouken@1895
   320
    int value, change;
slouken@1895
   321
    JOYINFOEX joyinfo;
slouken@0
   322
slouken@1895
   323
    joyinfo.dwSize = sizeof(joyinfo);
slouken@1895
   324
    joyinfo.dwFlags = JOY_RETURNALL | JOY_RETURNPOVCTS;
slouken@1895
   325
    if (!joystick->hats) {
slouken@1895
   326
        joyinfo.dwFlags &= ~(JOY_RETURNPOV | JOY_RETURNPOVCTS);
slouken@1895
   327
    }
slouken@1895
   328
    result = joyGetPosEx(joystick->hwdata->id, &joyinfo);
slouken@1895
   329
    if (result != JOYERR_NOERROR) {
slouken@1895
   330
        SetMMerror("joyGetPosEx", result);
slouken@1895
   331
        return;
slouken@1895
   332
    }
slouken@0
   333
slouken@1895
   334
    /* joystick motion events */
slouken@1895
   335
    pos[0] = joyinfo.dwXpos;
slouken@1895
   336
    pos[1] = joyinfo.dwYpos;
slouken@1895
   337
    pos[2] = joyinfo.dwZpos;
slouken@1895
   338
    pos[3] = joyinfo.dwRpos;
slouken@1895
   339
    pos[4] = joyinfo.dwUpos;
slouken@1895
   340
    pos[5] = joyinfo.dwVpos;
slouken@0
   341
slouken@1895
   342
    transaxis = joystick->hwdata->transaxis;
slouken@1895
   343
    for (i = 0; i < joystick->naxes; i++) {
slouken@1895
   344
        if (joyinfo.dwFlags & flags[i]) {
slouken@1895
   345
            value =
slouken@1895
   346
                (int) (((float) pos[i] +
slouken@1895
   347
                        transaxis[i].offset) * transaxis[i].scale);
slouken@1895
   348
            change = (value - joystick->axes[i]);
slouken@1895
   349
            if ((change < -JOY_AXIS_THRESHOLD)
slouken@1895
   350
                || (change > JOY_AXIS_THRESHOLD)) {
slouken@1895
   351
                SDL_PrivateJoystickAxis(joystick, (Uint8) i, (Sint16) value);
slouken@1895
   352
            }
slouken@1895
   353
        }
slouken@1895
   354
    }
slouken@0
   355
slouken@1895
   356
    /* joystick button events */
slouken@1895
   357
    if (joyinfo.dwFlags & JOY_RETURNBUTTONS) {
slouken@1895
   358
        for (i = 0; i < joystick->nbuttons; ++i) {
slouken@1895
   359
            if (joyinfo.dwButtons & JOY_BUTTON_FLAG(i)) {
slouken@1895
   360
                if (!joystick->buttons[i]) {
slouken@1895
   361
                    SDL_PrivateJoystickButton(joystick, (Uint8) i,
slouken@1895
   362
                                              SDL_PRESSED);
slouken@1895
   363
                }
slouken@1895
   364
            } else {
slouken@1895
   365
                if (joystick->buttons[i]) {
slouken@1895
   366
                    SDL_PrivateJoystickButton(joystick, (Uint8) i,
slouken@1895
   367
                                              SDL_RELEASED);
slouken@1895
   368
                }
slouken@1895
   369
            }
slouken@1895
   370
        }
slouken@1895
   371
    }
slouken@0
   372
slouken@1895
   373
    /* joystick hat events */
slouken@1895
   374
    if (joyinfo.dwFlags & JOY_RETURNPOV) {
slouken@1895
   375
        Uint8 pos;
slouken@0
   376
slouken@1895
   377
        pos = TranslatePOV(joyinfo.dwPOV);
slouken@1895
   378
        if (pos != joystick->hats[0]) {
slouken@1895
   379
            SDL_PrivateJoystickHat(joystick, 0, pos);
slouken@1895
   380
        }
slouken@1895
   381
    }
slouken@0
   382
}
slouken@0
   383
slouken@0
   384
/* Function to close a joystick after use */
slouken@1895
   385
void
slouken@1895
   386
SDL_SYS_JoystickClose(SDL_Joystick * joystick)
slouken@0
   387
{
slouken@1895
   388
    if (joystick->hwdata != NULL) {
slouken@1895
   389
        /* free system specific hardware data */
slouken@1895
   390
        SDL_free(joystick->hwdata);
icculus@3610
   391
        joystick->hwdata = NULL;
slouken@1895
   392
    }
slouken@0
   393
}
slouken@0
   394
slouken@0
   395
/* Function to perform any system-specific joystick related cleanup */
slouken@1895
   396
void
slouken@1895
   397
SDL_SYS_JoystickQuit(void)
slouken@0
   398
{
slouken@1895
   399
    int i;
slouken@1895
   400
    for (i = 0; i < MAX_JOYSTICKS; i++) {
slouken@1895
   401
        if (SYS_JoystickName[i] != NULL) {
slouken@1895
   402
            SDL_free(SYS_JoystickName[i]);
icculus@3610
   403
            SYS_JoystickName[i] = NULL;
slouken@1895
   404
        }
slouken@1895
   405
    }
slouken@0
   406
}
slouken@0
   407
slouken@6707
   408
JoystickGUID SDL_SYS_JoystickGetDeviceGUID( 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@6707
   412
    const char *name = SDL_SYS_JoystickNameForDeviceIndex( 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@6707
   418
JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
slouken@6698
   419
{
slouken@6698
   420
    JoystickGUID guid;
slouken@6698
   421
    // the GUID is just the first 16 chars of the name for now
slouken@6698
   422
    const char *name = joystick->name;
slouken@6698
   423
    SDL_zero( guid );
slouken@6698
   424
    SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
slouken@6698
   425
    return guid;
slouken@6698
   426
}
slouken@6698
   427
slouken@0
   428
slouken@0
   429
/* implementation functions */
slouken@1895
   430
void
slouken@1895
   431
SetMMerror(char *function, int code)
slouken@0
   432
{
slouken@1895
   433
    static char *error;
slouken@1895
   434
    static char errbuf[1024];
slouken@0
   435
slouken@1895
   436
    errbuf[0] = 0;
slouken@1895
   437
    switch (code) {
slouken@1895
   438
    case MMSYSERR_NODRIVER:
slouken@1895
   439
        error = "Joystick driver not present";
slouken@1895
   440
        break;
slouken@1895
   441
slouken@1895
   442
    case MMSYSERR_INVALPARAM:
slouken@1895
   443
    case JOYERR_PARMS:
slouken@1895
   444
        error = "Invalid parameter(s)";
slouken@1895
   445
        break;
slouken@1895
   446
slouken@1895
   447
    case MMSYSERR_BADDEVICEID:
slouken@1895
   448
        error = "Bad device ID";
slouken@1895
   449
        break;
slouken@0
   450
slouken@1895
   451
    case JOYERR_UNPLUGGED:
slouken@1895
   452
        error = "Joystick not attached";
slouken@1895
   453
        break;
slouken@0
   454
slouken@1895
   455
    case JOYERR_NOCANDO:
slouken@1895
   456
        error = "Can't capture joystick input";
slouken@1895
   457
        break;
slouken@0
   458
slouken@1895
   459
    default:
slouken@1895
   460
        SDL_snprintf(errbuf, SDL_arraysize(errbuf),
slouken@1895
   461
                     "%s: Unknown Multimedia system error: 0x%x",
slouken@1895
   462
                     function, code);
slouken@1895
   463
        break;
slouken@1895
   464
    }
slouken@0
   465
slouken@1895
   466
    if (!errbuf[0]) {
slouken@1895
   467
        SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: %s", function,
slouken@1895
   468
                     error);
slouken@1895
   469
    }
slouken@1895
   470
    SDL_SetError("%s", errbuf);
slouken@0
   471
}
slouken@1635
   472
slouken@1635
   473
#endif /* SDL_JOYSTICK_WINMM */
slouken@6707
   474
slouken@1895
   475
/* vi: set ts=4 sw=4 expandtab: */