Mercurial > sdl-ios-xcode
annotate src/joystick/win32/SDL_mmjoystick.c @ 1626:a80e1e0880b8
Fixed bug #176
[I'm fixing this for the public headers, but I'm not going to bother for the SDL library code (yet)]
To clarify: Normaly, GCC (or, to be precise, the preprocessor) will ignore
this, and compile the code happily. However, one can specify -Wundef to get a
warning about this.
One can probably argue whether to consider this a bug or not; but I think that
(a) from a semantic point of view, using "#if FOO" when FOO is not defined is
strange, and (b) since it is possible to trigger a warning about this, and a
trivial fix exists, it should be corrected.
I can think of two alternative patches, BTW:
1) Simply use #define HAVE_FOO 0, instead of not defining HAVE_FOO at all
2) Change
#if HAVE_FOO
to
#if HAVE_FOO+0
which always does the right thing.
But I think I still prefer the attached patch :-).
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 13 Apr 2006 13:38:40 +0000 |
| parents | bb6839704ed6 |
| children | 92947e3a18db |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Win32 MultiMedia Joystick driver, contributed by Andrei de A. Formiga */ | |
| 25 | |
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26 #define WIN32_LEAN_AND_MEAN |
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27 #include <windows.h> |
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28 #include <mmsystem.h> |
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29 #include <regstr.h> |
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30 |
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31 #include "SDL_events.h" |
| 0 | 32 #include "SDL_joystick.h" |
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33 #include "../SDL_sysjoystick.h" |
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34 #include "../SDL_joystick_c.h" |
| 0 | 35 |
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36 #define MAX_JOYSTICKS 16 |
| 0 | 37 #define MAX_AXES 6 /* each joystick can have up to 6 axes */ |
| 38 #define MAX_BUTTONS 32 /* and 32 buttons */ | |
| 39 #define AXIS_MIN -32768 /* minimum value for axis coordinate */ | |
| 40 #define AXIS_MAX 32767 /* maximum value for axis coordinate */ | |
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*** empty log message ***
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41 /* limit axis to 256 possible positions to filter out noise */ |
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42 #define JOY_AXIS_THRESHOLD (((AXIS_MAX)-(AXIS_MIN))/256) |
| 0 | 43 #define JOY_BUTTON_FLAG(n) (1<<n) |
| 44 | |
| 45 | |
| 46 /* array to hold joystick ID values */ | |
| 47 static UINT SYS_JoystickID[MAX_JOYSTICKS]; | |
| 48 static JOYCAPS SYS_Joystick[MAX_JOYSTICKS]; | |
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49 static char *SYS_JoystickName[MAX_JOYSTICKS]; |
| 0 | 50 |
| 51 /* The private structure used to keep track of a joystick */ | |
| 52 struct joystick_hwdata | |
| 53 { | |
| 54 /* joystick ID */ | |
| 55 UINT id; | |
| 56 | |
| 57 /* values used to translate device-specific coordinates into | |
| 58 SDL-standard ranges */ | |
| 59 struct _transaxis { | |
| 60 int offset; | |
| 61 float scale; | |
| 62 } transaxis[6]; | |
| 63 }; | |
| 64 | |
| 65 /* Convert a win32 Multimedia API return code to a text message */ | |
| 66 static void SetMMerror(char *function, int code); | |
| 67 | |
| 68 | |
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69 static char *GetJoystickName(int index, const char *szRegKey) |
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70 { |
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71 /* added 7/24/2004 by Eckhard Stolberg */ |
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72 /* |
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73 see if there is a joystick for the current |
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74 index (1-16) listed in the registry |
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75 */ |
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76 char *name = NULL; |
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77 HKEY hKey; |
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78 DWORD regsize; |
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79 LONG regresult; |
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80 unsigned char regkey[256]; |
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81 unsigned char regvalue[256]; |
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82 unsigned char regname[256]; |
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83 |
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84 SDL_snprintf((char *) regkey, SDL_arraysize(regkey), "%s\\%s\\%s", |
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85 REGSTR_PATH_JOYCONFIG, |
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86 szRegKey, |
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87 REGSTR_KEY_JOYCURR); |
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88 regresult = RegOpenKeyExA(HKEY_LOCAL_MACHINE, |
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89 (LPTSTR) ®key, 0, KEY_READ, &hKey); |
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90 if (regresult == ERROR_SUCCESS) |
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91 { |
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92 /* |
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93 find the registry key name for the |
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94 joystick's properties |
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95 */ |
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96 regsize = sizeof(regname); |
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97 SDL_snprintf((char *) regvalue, SDL_arraysize(regvalue), |
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98 "Joystick%d%s", index+1, |
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99 REGSTR_VAL_JOYOEMNAME); |
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100 regresult = RegQueryValueExA(hKey, |
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101 (char *) regvalue, 0, 0, (LPBYTE) ®name, |
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102 (LPDWORD) ®size); |
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103 RegCloseKey(hKey); |
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104 if (regresult == ERROR_SUCCESS) |
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105 { |
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106 /* open that registry key */ |
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107 SDL_snprintf((char *) regkey, SDL_arraysize(regkey), "%s\\%s", |
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108 REGSTR_PATH_JOYOEM, regname); |
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109 regresult = RegOpenKeyExA(HKEY_LOCAL_MACHINE, |
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110 (char *) regkey, 0, KEY_READ, &hKey); |
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111 if (regresult == ERROR_SUCCESS) |
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112 { |
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113 /* find the size for the OEM name text */ |
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114 regsize = sizeof(regvalue); |
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115 regresult = |
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116 RegQueryValueExA(hKey, |
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117 REGSTR_VAL_JOYOEMNAME, |
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118 0, 0, NULL, |
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119 (LPDWORD) ®size); |
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120 if (regresult == ERROR_SUCCESS) |
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121 { |
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122 /* |
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123 allocate enough memory |
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124 for the OEM name text ... |
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125 */ |
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126 name = (char *) SDL_malloc(regsize); |
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127 /* ... and read it from the registry */ |
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128 regresult = |
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129 RegQueryValueExA(hKey, |
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130 REGSTR_VAL_JOYOEMNAME, 0, 0, |
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131 (LPBYTE) name, |
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132 (LPDWORD) ®size); |
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133 RegCloseKey(hKey); |
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134 } |
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135 } |
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136 } |
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137 } |
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138 return(name); |
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139 } |
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140 |
| 0 | 141 /* Function to scan the system for joysticks. |
| 142 * This function should set SDL_numjoysticks to the number of available | |
| 143 * joysticks. Joystick 0 should be the system default joystick. | |
| 144 * It should return 0, or -1 on an unrecoverable fatal error. | |
| 145 */ | |
| 146 int SDL_SYS_JoystickInit(void) | |
| 147 { | |
| 148 int i; | |
| 149 int maxdevs; | |
| 150 int numdevs; | |
| 151 JOYINFOEX joyinfo; | |
| 152 JOYCAPS joycaps; | |
| 153 MMRESULT result; | |
| 154 | |
| 155 numdevs = 0; | |
| 156 maxdevs = joyGetNumDevs(); | |
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165
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157 |
| 0 | 158 if ( maxdevs > MAX_JOYSTICKS ) { |
| 159 maxdevs = MAX_JOYSTICKS; | |
| 160 } | |
| 161 | |
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162 |
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163 for ( i = 0; i < MAX_JOYSTICKS; i++ ) { |
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164 SYS_JoystickID[i] = JOYSTICKID1 + i; |
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165 SYS_JoystickName[i] = NULL; |
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166 } |
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167 |
| 0 | 168 |
| 169 for ( i = 0; (i < maxdevs); ++i ) { | |
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170 |
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171 /* added 8/31/2001 By Vitaliy Mikitchenko */ |
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172 joyinfo.dwSize = sizeof(joyinfo); |
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173 joyinfo.dwFlags = JOY_RETURNALL; |
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174 /* end addition */ |
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175 |
| 0 | 176 result = joyGetPosEx(SYS_JoystickID[i], &joyinfo); |
| 177 if ( result == JOYERR_NOERROR ) { | |
| 178 result = joyGetDevCaps(SYS_JoystickID[i], &joycaps, sizeof(joycaps)); | |
| 179 if ( result == JOYERR_NOERROR ) { | |
| 180 SYS_JoystickID[numdevs] = SYS_JoystickID[i]; | |
| 181 SYS_Joystick[numdevs] = joycaps; | |
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182 SYS_JoystickName[numdevs] = GetJoystickName(numdevs, joycaps.szRegKey); |
| 0 | 183 numdevs++; |
| 184 } | |
| 185 } | |
| 186 } | |
| 187 return(numdevs); | |
| 188 } | |
| 189 | |
| 190 /* Function to get the device-dependent name of a joystick */ | |
| 191 const char *SDL_SYS_JoystickName(int index) | |
| 192 { | |
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193 if ( SYS_JoystickName[index] != NULL ) { |
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194 return(SYS_JoystickName[index]); |
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195 } else { |
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196 return(SYS_Joystick[index].szPname); |
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197 } |
| 0 | 198 } |
| 199 | |
| 200 /* Function to open a joystick for use. | |
| 201 The joystick to open is specified by the index field of the joystick. | |
| 202 This should fill the nbuttons and naxes fields of the joystick structure. | |
| 203 It returns 0, or -1 if there is an error. | |
| 204 */ | |
| 205 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick) | |
| 206 { | |
| 207 int index, i; | |
| 208 int caps_flags[MAX_AXES-2] = | |
| 209 { JOYCAPS_HASZ, JOYCAPS_HASR, JOYCAPS_HASU, JOYCAPS_HASV }; | |
| 210 int axis_min[MAX_AXES], axis_max[MAX_AXES]; | |
| 211 | |
| 212 | |
| 213 /* shortcut */ | |
| 214 index = joystick->index; | |
| 215 axis_min[0] = SYS_Joystick[index].wXmin; | |
| 216 axis_max[0] = SYS_Joystick[index].wXmax; | |
| 217 axis_min[1] = SYS_Joystick[index].wYmin; | |
| 218 axis_max[1] = SYS_Joystick[index].wYmax; | |
| 219 axis_min[2] = SYS_Joystick[index].wZmin; | |
| 220 axis_max[2] = SYS_Joystick[index].wZmax; | |
| 221 axis_min[3] = SYS_Joystick[index].wRmin; | |
| 222 axis_max[3] = SYS_Joystick[index].wRmax; | |
| 223 axis_min[4] = SYS_Joystick[index].wUmin; | |
| 224 axis_max[4] = SYS_Joystick[index].wUmax; | |
| 225 axis_min[5] = SYS_Joystick[index].wVmin; | |
| 226 axis_max[5] = SYS_Joystick[index].wVmax; | |
| 227 | |
| 228 /* allocate memory for system specific hardware data */ | |
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229 joystick->hwdata = (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata)); |
| 0 | 230 if (joystick->hwdata == NULL) |
| 231 { | |
| 232 SDL_OutOfMemory(); | |
| 233 return(-1); | |
| 234 } | |
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235 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata)); |
| 0 | 236 |
| 237 /* set hardware data */ | |
| 238 joystick->hwdata->id = SYS_JoystickID[index]; | |
| 239 for ( i = 0; i < MAX_AXES; ++i ) { | |
| 240 if ( (i<2) || (SYS_Joystick[index].wCaps & caps_flags[i-2]) ) { | |
| 241 joystick->hwdata->transaxis[i].offset = | |
| 242 AXIS_MIN - axis_min[i]; | |
| 243 joystick->hwdata->transaxis[i].scale = | |
| 244 (float)(AXIS_MAX - AXIS_MIN) / (axis_max[i] - axis_min[i]); | |
| 245 } else { | |
| 246 joystick->hwdata->transaxis[i].offset = 0; | |
| 247 joystick->hwdata->transaxis[i].scale = 1.0; /* Just in case */ | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 /* fill nbuttons, naxes, and nhats fields */ | |
| 252 joystick->nbuttons = SYS_Joystick[index].wNumButtons; | |
| 253 joystick->naxes = SYS_Joystick[index].wNumAxes; | |
| 254 if ( SYS_Joystick[index].wCaps & JOYCAPS_HASPOV ) { | |
| 255 joystick->nhats = 1; | |
| 256 } else { | |
| 257 joystick->nhats = 0; | |
| 258 } | |
| 259 return(0); | |
| 260 } | |
| 261 | |
| 262 static Uint8 TranslatePOV(DWORD value) | |
| 263 { | |
| 264 Uint8 pos; | |
| 265 | |
| 266 pos = SDL_HAT_CENTERED; | |
| 267 if ( value != JOY_POVCENTERED ) { | |
| 268 if ( (value > JOY_POVLEFT) || (value < JOY_POVRIGHT) ) { | |
| 269 pos |= SDL_HAT_UP; | |
| 270 } | |
| 271 if ( (value > JOY_POVFORWARD) && (value < JOY_POVBACKWARD) ) { | |
| 272 pos |= SDL_HAT_RIGHT; | |
| 273 } | |
| 274 if ( (value > JOY_POVRIGHT) && (value < JOY_POVLEFT) ) { | |
| 275 pos |= SDL_HAT_DOWN; | |
| 276 } | |
| 277 if ( value > JOY_POVBACKWARD ) { | |
| 278 pos |= SDL_HAT_LEFT; | |
| 279 } | |
| 280 } | |
| 281 return(pos); | |
| 282 } | |
| 283 | |
| 284 /* Function to update the state of a joystick - called as a device poll. | |
| 285 * This function shouldn't update the joystick structure directly, | |
| 286 * but instead should call SDL_PrivateJoystick*() to deliver events | |
| 287 * and update joystick device state. | |
| 288 */ | |
| 289 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick) | |
| 290 { | |
| 291 MMRESULT result; | |
| 292 int i; | |
| 293 DWORD flags[MAX_AXES] = { JOY_RETURNX, JOY_RETURNY, JOY_RETURNZ, | |
| 294 JOY_RETURNR, JOY_RETURNU, JOY_RETURNV }; | |
| 295 DWORD pos[MAX_AXES]; | |
| 296 struct _transaxis *transaxis; | |
| 297 int value, change; | |
| 298 JOYINFOEX joyinfo; | |
| 299 | |
| 300 joyinfo.dwSize = sizeof(joyinfo); | |
| 301 joyinfo.dwFlags = JOY_RETURNALL|JOY_RETURNPOVCTS; | |
| 302 if ( ! joystick->hats ) { | |
| 303 joyinfo.dwFlags &= ~(JOY_RETURNPOV|JOY_RETURNPOVCTS); | |
| 304 } | |
| 305 result = joyGetPosEx(joystick->hwdata->id, &joyinfo); | |
| 306 if ( result != JOYERR_NOERROR ) { | |
| 307 SetMMerror("joyGetPosEx", result); | |
| 308 return; | |
| 309 } | |
| 310 | |
| 311 /* joystick motion events */ | |
| 312 pos[0] = joyinfo.dwXpos; | |
| 313 pos[1] = joyinfo.dwYpos; | |
| 314 pos[2] = joyinfo.dwZpos; | |
| 315 pos[3] = joyinfo.dwRpos; | |
| 316 pos[4] = joyinfo.dwUpos; | |
| 317 pos[5] = joyinfo.dwVpos; | |
| 318 | |
| 319 transaxis = joystick->hwdata->transaxis; | |
| 320 for (i = 0; i < joystick->naxes; i++) { | |
| 321 if (joyinfo.dwFlags & flags[i]) { | |
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322 value = (int)(((float)pos[i] + transaxis[i].offset) * transaxis[i].scale); |
| 0 | 323 change = (value - joystick->axes[i]); |
| 324 if ( (change < -JOY_AXIS_THRESHOLD) || (change > JOY_AXIS_THRESHOLD) ) { | |
| 325 SDL_PrivateJoystickAxis(joystick, (Uint8)i, (Sint16)value); | |
| 326 } | |
| 327 } | |
| 328 } | |
| 329 | |
| 330 /* joystick button events */ | |
| 331 if ( joyinfo.dwFlags & JOY_RETURNBUTTONS ) { | |
| 332 for ( i = 0; i < joystick->nbuttons; ++i ) { | |
| 333 if ( joyinfo.dwButtons & JOY_BUTTON_FLAG(i) ) { | |
| 334 if ( ! joystick->buttons[i] ) { | |
| 335 SDL_PrivateJoystickButton(joystick, (Uint8)i, SDL_PRESSED); | |
| 336 } | |
| 337 } else { | |
| 338 if ( joystick->buttons[i] ) { | |
| 339 SDL_PrivateJoystickButton(joystick, (Uint8)i, SDL_RELEASED); | |
| 340 } | |
| 341 } | |
| 342 } | |
| 343 } | |
| 344 | |
| 345 /* joystick hat events */ | |
| 346 if ( joyinfo.dwFlags & JOY_RETURNPOV ) { | |
| 347 Uint8 pos; | |
| 348 | |
| 349 pos = TranslatePOV(joyinfo.dwPOV); | |
| 350 if ( pos != joystick->hats[0] ) { | |
| 351 SDL_PrivateJoystickHat(joystick, 0, pos); | |
| 352 } | |
| 353 } | |
| 354 } | |
| 355 | |
| 356 /* Function to close a joystick after use */ | |
| 357 void SDL_SYS_JoystickClose(SDL_Joystick *joystick) | |
| 358 { | |
| 359 if (joystick->hwdata != NULL) { | |
| 360 /* free system specific hardware data */ | |
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361 SDL_free(joystick->hwdata); |
| 0 | 362 } |
| 363 } | |
| 364 | |
| 365 /* Function to perform any system-specific joystick related cleanup */ | |
| 366 void SDL_SYS_JoystickQuit(void) | |
| 367 { | |
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368 int i; |
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369 for (i = 0; i < MAX_JOYSTICKS; i++) { |
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370 if ( SYS_JoystickName[i] != NULL ) { |
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371 SDL_free(SYS_JoystickName[i]); |
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372 } |
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373 } |
| 0 | 374 } |
| 375 | |
| 376 | |
| 377 /* implementation functions */ | |
| 378 void SetMMerror(char *function, int code) | |
| 379 { | |
| 380 static char *error; | |
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381 static char errbuf[1024]; |
| 0 | 382 |
| 383 errbuf[0] = 0; | |
| 384 switch (code) | |
| 385 { | |
| 386 case MMSYSERR_NODRIVER: | |
| 387 error = "Joystick driver not present"; | |
| 388 break; | |
| 389 | |
| 390 case MMSYSERR_INVALPARAM: | |
| 391 case JOYERR_PARMS: | |
| 392 error = "Invalid parameter(s)"; | |
| 393 break; | |
| 394 | |
| 395 case MMSYSERR_BADDEVICEID: | |
| 396 error = "Bad device ID"; | |
| 397 break; | |
| 398 | |
| 399 case JOYERR_UNPLUGGED: | |
| 400 error = "Joystick not attached"; | |
| 401 break; | |
| 402 | |
| 403 case JOYERR_NOCANDO: | |
| 404 error = "Can't capture joystick input"; | |
| 405 break; | |
| 406 | |
| 407 default: | |
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408 SDL_snprintf(errbuf, SDL_arraysize(errbuf), |
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409 "%s: Unknown Multimedia system error: 0x%x", |
| 0 | 410 function, code); |
| 411 break; | |
| 412 } | |
| 413 | |
| 414 if ( ! errbuf[0] ) { | |
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415 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: %s", function, error); |
| 0 | 416 } |
| 417 SDL_SetError("%s", errbuf); | |
| 418 } |