Mercurial > sdl-ios-xcode
annotate src/joystick/SDL_joystick.c @ 4147:6bdec986f2f6 SDL-1.2
Fix bug 545, by returning early whenever an error occurs when initializing joystick structure
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Sat, 19 Jul 2008 11:54:55 +0000 |
| parents | 97d0966f4bf7 |
| children | a1b03ba2fcd0 |
| 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 /* This is the joystick API for Simple DirectMedia Layer */ | |
| 25 | |
| 26 #include "SDL_events.h" | |
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27 #include "SDL_sysjoystick.h" |
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28 #include "SDL_joystick_c.h" |
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29 #if !SDL_EVENTS_DISABLED |
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30 #include "../events/SDL_events_c.h" |
| 0 | 31 #endif |
| 32 | |
| 33 /* This is used for Quake III Arena */ | |
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34 #if SDL_EVENTS_DISABLED |
| 0 | 35 #define SDL_Lock_EventThread() |
| 36 #define SDL_Unlock_EventThread() | |
| 37 #endif | |
| 38 | |
| 39 Uint8 SDL_numjoysticks = 0; | |
| 40 SDL_Joystick **SDL_joysticks = NULL; | |
| 41 static SDL_Joystick *default_joystick = NULL; | |
| 42 | |
| 43 int SDL_JoystickInit(void) | |
| 44 { | |
| 45 int arraylen; | |
| 46 int status; | |
| 47 | |
| 48 SDL_numjoysticks = 0; | |
| 49 status = SDL_SYS_JoystickInit(); | |
| 50 if ( status >= 0 ) { | |
| 51 arraylen = (status+1)*sizeof(*SDL_joysticks); | |
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52 SDL_joysticks = (SDL_Joystick **)SDL_malloc(arraylen); |
| 0 | 53 if ( SDL_joysticks == NULL ) { |
| 54 SDL_numjoysticks = 0; | |
| 55 } else { | |
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56 SDL_memset(SDL_joysticks, 0, arraylen); |
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57 SDL_numjoysticks = status; |
| 0 | 58 } |
| 59 status = 0; | |
| 60 } | |
| 61 default_joystick = NULL; | |
| 62 return(status); | |
| 63 } | |
| 64 | |
| 65 /* | |
| 66 * Count the number of joysticks attached to the system | |
| 67 */ | |
| 68 int SDL_NumJoysticks(void) | |
| 69 { | |
| 70 return SDL_numjoysticks; | |
| 71 } | |
| 72 | |
| 73 /* | |
| 74 * Get the implementation dependent name of a joystick | |
| 75 */ | |
| 76 const char *SDL_JoystickName(int device_index) | |
| 77 { | |
| 78 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 79 SDL_SetError("There are %d joysticks available", | |
| 80 SDL_numjoysticks); | |
| 81 return(NULL); | |
| 82 } | |
| 83 return(SDL_SYS_JoystickName(device_index)); | |
| 84 } | |
| 85 | |
| 86 /* | |
| 87 * Open a joystick for use - the index passed as an argument refers to | |
| 88 * the N'th joystick on the system. This index is the value which will | |
| 89 * identify this joystick in future joystick events. | |
| 90 * | |
| 91 * This function returns a joystick identifier, or NULL if an error occurred. | |
| 92 */ | |
| 93 SDL_Joystick *SDL_JoystickOpen(int device_index) | |
| 94 { | |
| 95 int i; | |
| 96 SDL_Joystick *joystick; | |
| 97 | |
| 98 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 99 SDL_SetError("There are %d joysticks available", | |
| 100 SDL_numjoysticks); | |
| 101 return(NULL); | |
| 102 } | |
| 103 | |
| 104 /* If the joystick is already open, return it */ | |
| 105 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 106 if ( device_index == SDL_joysticks[i]->index ) { | |
| 107 joystick = SDL_joysticks[i]; | |
| 108 ++joystick->ref_count; | |
| 109 return(joystick); | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 /* Create and initialize the joystick */ | |
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114 joystick = (SDL_Joystick *)SDL_malloc((sizeof *joystick)); |
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115 if ( !joystick ) { |
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116 return(NULL); |
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117 } |
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118 |
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119 SDL_memset(joystick, 0, (sizeof *joystick)); |
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120 joystick->index = device_index; |
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121 if ( SDL_SYS_JoystickOpen(joystick) < 0 ) { |
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122 SDL_free(joystick); |
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123 return(NULL); |
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124 } |
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125 |
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126 if ( joystick->naxes > 0 ) { |
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127 joystick->axes = (Sint16 *)SDL_malloc |
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128 (joystick->naxes*sizeof(Sint16)); |
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129 } |
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130 if ( joystick->nhats > 0 ) { |
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131 joystick->hats = (Uint8 *)SDL_malloc |
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132 (joystick->nhats*sizeof(Uint8)); |
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133 } |
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134 if ( joystick->nballs > 0 ) { |
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135 joystick->balls = (struct balldelta *)SDL_malloc |
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136 (joystick->nballs*sizeof(*joystick->balls)); |
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137 } |
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138 if ( joystick->nbuttons > 0 ) { |
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139 joystick->buttons = (Uint8 *)SDL_malloc |
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140 (joystick->nbuttons*sizeof(Uint8)); |
| 0 | 141 } |
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142 if ( ((joystick->naxes > 0) && !joystick->axes) |
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143 || ((joystick->nhats > 0) && !joystick->hats) |
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144 || ((joystick->nballs > 0) && !joystick->balls) |
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145 || ((joystick->nbuttons > 0) && !joystick->buttons)) { |
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146 SDL_OutOfMemory(); |
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147 SDL_JoystickClose(joystick); |
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148 return(NULL); |
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149 } |
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150 |
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151 if ( joystick->axes ) { |
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152 SDL_memset(joystick->axes, 0, |
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153 joystick->naxes*sizeof(Sint16)); |
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154 } |
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155 if ( joystick->hats ) { |
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156 SDL_memset(joystick->hats, 0, |
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157 joystick->nhats*sizeof(Uint8)); |
| 0 | 158 } |
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159 if ( joystick->balls ) { |
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160 SDL_memset(joystick->balls, 0, |
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161 joystick->nballs*sizeof(*joystick->balls)); |
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162 } |
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163 if ( joystick->buttons ) { |
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164 SDL_memset(joystick->buttons, 0, |
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165 joystick->nbuttons*sizeof(Uint8)); |
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166 } |
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167 |
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168 /* Add joystick to list */ |
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169 ++joystick->ref_count; |
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170 SDL_Lock_EventThread(); |
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171 for ( i=0; SDL_joysticks[i]; ++i ) |
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172 /* Skip to next joystick */ ; |
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173 SDL_joysticks[i] = joystick; |
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174 SDL_Unlock_EventThread(); |
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175 |
| 0 | 176 return(joystick); |
| 177 } | |
| 178 | |
| 179 /* | |
| 180 * Returns 1 if the joystick has been opened, or 0 if it has not. | |
| 181 */ | |
| 182 int SDL_JoystickOpened(int device_index) | |
| 183 { | |
| 184 int i, opened; | |
| 185 | |
| 186 opened = 0; | |
| 187 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 188 if ( SDL_joysticks[i]->index == (Uint8)device_index ) { | |
| 189 opened = 1; | |
| 190 break; | |
| 191 } | |
| 192 } | |
| 193 return(opened); | |
| 194 } | |
| 195 | |
| 196 static int ValidJoystick(SDL_Joystick **joystick) | |
| 197 { | |
| 198 int valid; | |
| 199 | |
| 200 if ( *joystick == NULL ) { | |
| 201 *joystick = default_joystick; | |
| 202 } | |
| 203 if ( *joystick == NULL ) { | |
| 204 SDL_SetError("Joystick hasn't been opened yet"); | |
| 205 valid = 0; | |
| 206 } else { | |
| 207 valid = 1; | |
| 208 } | |
| 209 return valid; | |
| 210 } | |
| 211 | |
| 212 /* | |
| 213 * Get the device index of an opened joystick. | |
| 214 */ | |
| 215 int SDL_JoystickIndex(SDL_Joystick *joystick) | |
| 216 { | |
| 217 if ( ! ValidJoystick(&joystick) ) { | |
| 218 return(-1); | |
| 219 } | |
| 220 return(joystick->index); | |
| 221 } | |
| 222 | |
| 223 /* | |
| 224 * Get the number of multi-dimensional axis controls on a joystick | |
| 225 */ | |
| 226 int SDL_JoystickNumAxes(SDL_Joystick *joystick) | |
| 227 { | |
| 228 if ( ! ValidJoystick(&joystick) ) { | |
| 229 return(-1); | |
| 230 } | |
| 231 return(joystick->naxes); | |
| 232 } | |
| 233 | |
| 234 /* | |
| 235 * Get the number of hats on a joystick | |
| 236 */ | |
| 237 int SDL_JoystickNumHats(SDL_Joystick *joystick) | |
| 238 { | |
| 239 if ( ! ValidJoystick(&joystick) ) { | |
| 240 return(-1); | |
| 241 } | |
| 242 return(joystick->nhats); | |
| 243 } | |
| 244 | |
| 245 /* | |
| 246 * Get the number of trackballs on a joystick | |
| 247 */ | |
| 248 int SDL_JoystickNumBalls(SDL_Joystick *joystick) | |
| 249 { | |
| 250 if ( ! ValidJoystick(&joystick) ) { | |
| 251 return(-1); | |
| 252 } | |
| 253 return(joystick->nballs); | |
| 254 } | |
| 255 | |
| 256 /* | |
| 257 * Get the number of buttons on a joystick | |
| 258 */ | |
| 259 int SDL_JoystickNumButtons(SDL_Joystick *joystick) | |
| 260 { | |
| 261 if ( ! ValidJoystick(&joystick) ) { | |
| 262 return(-1); | |
| 263 } | |
| 264 return(joystick->nbuttons); | |
| 265 } | |
| 266 | |
| 267 /* | |
| 268 * Get the current state of an axis control on a joystick | |
| 269 */ | |
| 270 Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis) | |
| 271 { | |
| 272 Sint16 state; | |
| 273 | |
| 274 if ( ! ValidJoystick(&joystick) ) { | |
| 275 return(0); | |
| 276 } | |
| 277 if ( axis < joystick->naxes ) { | |
| 278 state = joystick->axes[axis]; | |
| 279 } else { | |
| 280 SDL_SetError("Joystick only has %d axes", joystick->naxes); | |
| 281 state = 0; | |
| 282 } | |
| 283 return(state); | |
| 284 } | |
| 285 | |
| 286 /* | |
| 287 * Get the current state of a hat on a joystick | |
| 288 */ | |
| 289 Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat) | |
| 290 { | |
| 291 Uint8 state; | |
| 292 | |
| 293 if ( ! ValidJoystick(&joystick) ) { | |
| 294 return(0); | |
| 295 } | |
| 296 if ( hat < joystick->nhats ) { | |
| 297 state = joystick->hats[hat]; | |
| 298 } else { | |
| 299 SDL_SetError("Joystick only has %d hats", joystick->nhats); | |
| 300 state = 0; | |
| 301 } | |
| 302 return(state); | |
| 303 } | |
| 304 | |
| 305 /* | |
| 306 * Get the ball axis change since the last poll | |
| 307 */ | |
| 308 int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy) | |
| 309 { | |
| 310 int retval; | |
| 311 | |
| 312 if ( ! ValidJoystick(&joystick) ) { | |
| 313 return(-1); | |
| 314 } | |
| 315 | |
| 316 retval = 0; | |
| 317 if ( ball < joystick->nballs ) { | |
| 318 if ( dx ) { | |
| 319 *dx = joystick->balls[ball].dx; | |
| 320 } | |
| 321 if ( dy ) { | |
| 322 *dy = joystick->balls[ball].dy; | |
| 323 } | |
| 324 joystick->balls[ball].dx = 0; | |
| 325 joystick->balls[ball].dy = 0; | |
| 326 } else { | |
| 327 SDL_SetError("Joystick only has %d balls", joystick->nballs); | |
| 328 retval = -1; | |
| 329 } | |
| 330 return(retval); | |
| 331 } | |
| 332 | |
| 333 /* | |
| 334 * Get the current state of a button on a joystick | |
| 335 */ | |
| 336 Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button) | |
| 337 { | |
| 338 Uint8 state; | |
| 339 | |
| 340 if ( ! ValidJoystick(&joystick) ) { | |
| 341 return(0); | |
| 342 } | |
| 343 if ( button < joystick->nbuttons ) { | |
| 344 state = joystick->buttons[button]; | |
| 345 } else { | |
| 346 SDL_SetError("Joystick only has %d buttons",joystick->nbuttons); | |
| 347 state = 0; | |
| 348 } | |
| 349 return(state); | |
| 350 } | |
| 351 | |
| 352 /* | |
| 353 * Close a joystick previously opened with SDL_JoystickOpen() | |
| 354 */ | |
| 355 void SDL_JoystickClose(SDL_Joystick *joystick) | |
| 356 { | |
| 357 int i; | |
| 358 | |
| 359 if ( ! ValidJoystick(&joystick) ) { | |
| 360 return; | |
| 361 } | |
| 362 | |
| 363 /* First decrement ref count */ | |
| 364 if ( --joystick->ref_count > 0 ) { | |
| 365 return; | |
| 366 } | |
| 367 | |
| 368 /* Lock the event queue - prevent joystick polling */ | |
| 369 SDL_Lock_EventThread(); | |
| 370 | |
| 371 if ( joystick == default_joystick ) { | |
| 372 default_joystick = NULL; | |
| 373 } | |
| 374 SDL_SYS_JoystickClose(joystick); | |
| 375 | |
| 376 /* Remove joystick from list */ | |
| 377 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 378 if ( joystick == SDL_joysticks[i] ) { | |
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379 SDL_memcpy(&SDL_joysticks[i], &SDL_joysticks[i+1], |
| 0 | 380 (SDL_numjoysticks-i)*sizeof(joystick)); |
| 381 break; | |
| 382 } | |
| 383 } | |
| 384 | |
| 385 /* Let the event thread keep running */ | |
| 386 SDL_Unlock_EventThread(); | |
| 387 | |
| 388 /* Free the data associated with this joystick */ | |
| 389 if ( joystick->axes ) { | |
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390 SDL_free(joystick->axes); |
| 0 | 391 } |
| 392 if ( joystick->hats ) { | |
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393 SDL_free(joystick->hats); |
| 0 | 394 } |
| 395 if ( joystick->balls ) { | |
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396 SDL_free(joystick->balls); |
| 0 | 397 } |
| 398 if ( joystick->buttons ) { | |
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399 SDL_free(joystick->buttons); |
| 0 | 400 } |
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401 SDL_free(joystick); |
| 0 | 402 } |
| 403 | |
| 404 void SDL_JoystickQuit(void) | |
| 405 { | |
| 406 /* Stop the event polling */ | |
| 407 SDL_Lock_EventThread(); | |
| 408 SDL_numjoysticks = 0; | |
| 409 SDL_Unlock_EventThread(); | |
| 410 | |
| 411 /* Quit the joystick setup */ | |
| 412 SDL_SYS_JoystickQuit(); | |
| 413 if ( SDL_joysticks ) { | |
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414 SDL_free(SDL_joysticks); |
| 0 | 415 SDL_joysticks = NULL; |
| 416 } | |
| 417 } | |
| 418 | |
| 419 | |
| 420 /* These are global for SDL_sysjoystick.c and SDL_events.c */ | |
| 421 | |
| 422 int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value) | |
| 423 { | |
| 424 int posted; | |
| 425 | |
| 426 /* Update internal joystick state */ | |
| 427 joystick->axes[axis] = value; | |
| 428 | |
| 429 /* Post the event, if desired */ | |
| 430 posted = 0; | |
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431 #if !SDL_EVENTS_DISABLED |
| 0 | 432 if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) { |
| 433 SDL_Event event; | |
| 434 event.type = SDL_JOYAXISMOTION; | |
| 435 event.jaxis.which = joystick->index; | |
| 436 event.jaxis.axis = axis; | |
| 437 event.jaxis.value = value; | |
| 438 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 439 posted = 1; | |
| 440 SDL_PushEvent(&event); | |
| 441 } | |
| 442 } | |
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443 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 444 return(posted); |
| 445 } | |
| 446 | |
| 447 int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value) | |
| 448 { | |
| 449 int posted; | |
| 450 | |
| 451 /* Update internal joystick state */ | |
| 452 joystick->hats[hat] = value; | |
| 453 | |
| 454 /* Post the event, if desired */ | |
| 455 posted = 0; | |
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456 #if !SDL_EVENTS_DISABLED |
| 0 | 457 if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) { |
| 458 SDL_Event event; | |
| 459 event.jhat.type = SDL_JOYHATMOTION; | |
| 460 event.jhat.which = joystick->index; | |
| 461 event.jhat.hat = hat; | |
| 462 event.jhat.value = value; | |
| 463 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 464 posted = 1; | |
| 465 SDL_PushEvent(&event); | |
| 466 } | |
| 467 } | |
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468 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 469 return(posted); |
| 470 } | |
| 471 | |
| 472 int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball, | |
| 473 Sint16 xrel, Sint16 yrel) | |
| 474 { | |
| 475 int posted; | |
| 476 | |
| 477 /* Update internal mouse state */ | |
| 478 joystick->balls[ball].dx += xrel; | |
| 479 joystick->balls[ball].dy += yrel; | |
| 480 | |
| 481 /* Post the event, if desired */ | |
| 482 posted = 0; | |
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483 #if !SDL_EVENTS_DISABLED |
| 0 | 484 if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) { |
| 485 SDL_Event event; | |
| 486 event.jball.type = SDL_JOYBALLMOTION; | |
| 487 event.jball.which = joystick->index; | |
| 488 event.jball.ball = ball; | |
| 489 event.jball.xrel = xrel; | |
| 490 event.jball.yrel = yrel; | |
| 491 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 492 posted = 1; | |
| 493 SDL_PushEvent(&event); | |
| 494 } | |
| 495 } | |
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496 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 497 return(posted); |
| 498 } | |
| 499 | |
| 500 int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state) | |
| 501 { | |
| 502 int posted; | |
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503 #if !SDL_EVENTS_DISABLED |
| 0 | 504 SDL_Event event; |
| 505 | |
| 506 switch ( state ) { | |
| 507 case SDL_PRESSED: | |
| 508 event.type = SDL_JOYBUTTONDOWN; | |
| 509 break; | |
| 510 case SDL_RELEASED: | |
| 511 event.type = SDL_JOYBUTTONUP; | |
| 512 break; | |
| 513 default: | |
| 514 /* Invalid state -- bail */ | |
| 515 return(0); | |
| 516 } | |
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517 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 518 |
| 519 /* Update internal joystick state */ | |
| 520 joystick->buttons[button] = state; | |
| 521 | |
| 522 /* Post the event, if desired */ | |
| 523 posted = 0; | |
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524 #if !SDL_EVENTS_DISABLED |
| 0 | 525 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { |
| 526 event.jbutton.which = joystick->index; | |
| 527 event.jbutton.button = button; | |
| 528 event.jbutton.state = state; | |
| 529 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 530 posted = 1; | |
| 531 SDL_PushEvent(&event); | |
| 532 } | |
| 533 } | |
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534 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 535 return(posted); |
| 536 } | |
| 537 | |
| 538 void SDL_JoystickUpdate(void) | |
| 539 { | |
| 540 int i; | |
| 541 | |
| 542 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 543 SDL_SYS_JoystickUpdate(SDL_joysticks[i]); | |
| 544 } | |
| 545 } | |
| 546 | |
| 547 int SDL_JoystickEventState(int state) | |
| 548 { | |
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549 #if SDL_EVENTS_DISABLED |
| 0 | 550 return SDL_IGNORE; |
| 551 #else | |
| 552 const Uint8 event_list[] = { | |
| 553 SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION, | |
| 554 SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, | |
| 555 }; | |
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556 unsigned int i; |
| 0 | 557 |
| 558 switch (state) { | |
| 559 case SDL_QUERY: | |
| 560 state = SDL_IGNORE; | |
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561 for ( i=0; i<SDL_arraysize(event_list); ++i ) { |
| 0 | 562 state = SDL_EventState(event_list[i],SDL_QUERY); |
| 563 if ( state == SDL_ENABLE ) { | |
| 564 break; | |
| 565 } | |
| 566 } | |
| 567 break; | |
| 568 default: | |
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569 for ( i=0; i<SDL_arraysize(event_list); ++i ) { |
| 0 | 570 SDL_EventState(event_list[i], state); |
| 571 } | |
| 572 break; | |
| 573 } | |
| 574 return(state); | |
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575 #endif /* SDL_EVENTS_DISABLED */ |
| 0 | 576 } |