Mercurial > sdl-ios-xcode
annotate src/joystick/SDL_joystick.c @ 4543:d7cdc25af9a2 SDL-1.2
Better fix for bug 936
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 18 Jul 2010 10:28:57 -0700 |
| parents | 3c35b8d3b9fc |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 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 SDL_OutOfMemory(); |
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117 return(NULL); |
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118 } |
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119 |
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120 SDL_memset(joystick, 0, (sizeof *joystick)); |
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121 joystick->index = device_index; |
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122 if ( SDL_SYS_JoystickOpen(joystick) < 0 ) { |
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123 SDL_free(joystick); |
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124 return(NULL); |
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125 } |
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126 |
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127 if ( joystick->naxes > 0 ) { |
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128 joystick->axes = (Sint16 *)SDL_malloc |
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129 (joystick->naxes*sizeof(Sint16)); |
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130 } |
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131 if ( joystick->nhats > 0 ) { |
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132 joystick->hats = (Uint8 *)SDL_malloc |
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133 (joystick->nhats*sizeof(Uint8)); |
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134 } |
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135 if ( joystick->nballs > 0 ) { |
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136 joystick->balls = (struct balldelta *)SDL_malloc |
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137 (joystick->nballs*sizeof(*joystick->balls)); |
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138 } |
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139 if ( joystick->nbuttons > 0 ) { |
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140 joystick->buttons = (Uint8 *)SDL_malloc |
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141 (joystick->nbuttons*sizeof(Uint8)); |
| 0 | 142 } |
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143 if ( ((joystick->naxes > 0) && !joystick->axes) |
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144 || ((joystick->nhats > 0) && !joystick->hats) |
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145 || ((joystick->nballs > 0) && !joystick->balls) |
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146 || ((joystick->nbuttons > 0) && !joystick->buttons)) { |
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147 SDL_OutOfMemory(); |
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148 SDL_JoystickClose(joystick); |
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149 return(NULL); |
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150 } |
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151 |
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152 if ( joystick->axes ) { |
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153 SDL_memset(joystick->axes, 0, |
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154 joystick->naxes*sizeof(Sint16)); |
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155 } |
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156 if ( joystick->hats ) { |
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157 SDL_memset(joystick->hats, 0, |
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158 joystick->nhats*sizeof(Uint8)); |
| 0 | 159 } |
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160 if ( joystick->balls ) { |
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161 SDL_memset(joystick->balls, 0, |
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162 joystick->nballs*sizeof(*joystick->balls)); |
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163 } |
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164 if ( joystick->buttons ) { |
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165 SDL_memset(joystick->buttons, 0, |
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166 joystick->nbuttons*sizeof(Uint8)); |
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167 } |
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168 |
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169 /* Add joystick to list */ |
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170 ++joystick->ref_count; |
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171 SDL_Lock_EventThread(); |
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172 for ( i=0; SDL_joysticks[i]; ++i ) |
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173 /* Skip to next joystick */ ; |
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174 SDL_joysticks[i] = joystick; |
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175 SDL_Unlock_EventThread(); |
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176 |
| 0 | 177 return(joystick); |
| 178 } | |
| 179 | |
| 180 /* | |
| 181 * Returns 1 if the joystick has been opened, or 0 if it has not. | |
| 182 */ | |
| 183 int SDL_JoystickOpened(int device_index) | |
| 184 { | |
| 185 int i, opened; | |
| 186 | |
| 187 opened = 0; | |
| 188 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 189 if ( SDL_joysticks[i]->index == (Uint8)device_index ) { | |
| 190 opened = 1; | |
| 191 break; | |
| 192 } | |
| 193 } | |
| 194 return(opened); | |
| 195 } | |
| 196 | |
| 197 static int ValidJoystick(SDL_Joystick **joystick) | |
| 198 { | |
| 199 int valid; | |
| 200 | |
| 201 if ( *joystick == NULL ) { | |
| 202 *joystick = default_joystick; | |
| 203 } | |
| 204 if ( *joystick == NULL ) { | |
| 205 SDL_SetError("Joystick hasn't been opened yet"); | |
| 206 valid = 0; | |
| 207 } else { | |
| 208 valid = 1; | |
| 209 } | |
| 210 return valid; | |
| 211 } | |
| 212 | |
| 213 /* | |
| 214 * Get the device index of an opened joystick. | |
| 215 */ | |
| 216 int SDL_JoystickIndex(SDL_Joystick *joystick) | |
| 217 { | |
| 218 if ( ! ValidJoystick(&joystick) ) { | |
| 219 return(-1); | |
| 220 } | |
| 221 return(joystick->index); | |
| 222 } | |
| 223 | |
| 224 /* | |
| 225 * Get the number of multi-dimensional axis controls on a joystick | |
| 226 */ | |
| 227 int SDL_JoystickNumAxes(SDL_Joystick *joystick) | |
| 228 { | |
| 229 if ( ! ValidJoystick(&joystick) ) { | |
| 230 return(-1); | |
| 231 } | |
| 232 return(joystick->naxes); | |
| 233 } | |
| 234 | |
| 235 /* | |
| 236 * Get the number of hats on a joystick | |
| 237 */ | |
| 238 int SDL_JoystickNumHats(SDL_Joystick *joystick) | |
| 239 { | |
| 240 if ( ! ValidJoystick(&joystick) ) { | |
| 241 return(-1); | |
| 242 } | |
| 243 return(joystick->nhats); | |
| 244 } | |
| 245 | |
| 246 /* | |
| 247 * Get the number of trackballs on a joystick | |
| 248 */ | |
| 249 int SDL_JoystickNumBalls(SDL_Joystick *joystick) | |
| 250 { | |
| 251 if ( ! ValidJoystick(&joystick) ) { | |
| 252 return(-1); | |
| 253 } | |
| 254 return(joystick->nballs); | |
| 255 } | |
| 256 | |
| 257 /* | |
| 258 * Get the number of buttons on a joystick | |
| 259 */ | |
| 260 int SDL_JoystickNumButtons(SDL_Joystick *joystick) | |
| 261 { | |
| 262 if ( ! ValidJoystick(&joystick) ) { | |
| 263 return(-1); | |
| 264 } | |
| 265 return(joystick->nbuttons); | |
| 266 } | |
| 267 | |
| 268 /* | |
| 269 * Get the current state of an axis control on a joystick | |
| 270 */ | |
| 271 Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis) | |
| 272 { | |
| 273 Sint16 state; | |
| 274 | |
| 275 if ( ! ValidJoystick(&joystick) ) { | |
| 276 return(0); | |
| 277 } | |
| 278 if ( axis < joystick->naxes ) { | |
| 279 state = joystick->axes[axis]; | |
| 280 } else { | |
| 281 SDL_SetError("Joystick only has %d axes", joystick->naxes); | |
| 282 state = 0; | |
| 283 } | |
| 284 return(state); | |
| 285 } | |
| 286 | |
| 287 /* | |
| 288 * Get the current state of a hat on a joystick | |
| 289 */ | |
| 290 Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat) | |
| 291 { | |
| 292 Uint8 state; | |
| 293 | |
| 294 if ( ! ValidJoystick(&joystick) ) { | |
| 295 return(0); | |
| 296 } | |
| 297 if ( hat < joystick->nhats ) { | |
| 298 state = joystick->hats[hat]; | |
| 299 } else { | |
| 300 SDL_SetError("Joystick only has %d hats", joystick->nhats); | |
| 301 state = 0; | |
| 302 } | |
| 303 return(state); | |
| 304 } | |
| 305 | |
| 306 /* | |
| 307 * Get the ball axis change since the last poll | |
| 308 */ | |
| 309 int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy) | |
| 310 { | |
| 311 int retval; | |
| 312 | |
| 313 if ( ! ValidJoystick(&joystick) ) { | |
| 314 return(-1); | |
| 315 } | |
| 316 | |
| 317 retval = 0; | |
| 318 if ( ball < joystick->nballs ) { | |
| 319 if ( dx ) { | |
| 320 *dx = joystick->balls[ball].dx; | |
| 321 } | |
| 322 if ( dy ) { | |
| 323 *dy = joystick->balls[ball].dy; | |
| 324 } | |
| 325 joystick->balls[ball].dx = 0; | |
| 326 joystick->balls[ball].dy = 0; | |
| 327 } else { | |
| 328 SDL_SetError("Joystick only has %d balls", joystick->nballs); | |
| 329 retval = -1; | |
| 330 } | |
| 331 return(retval); | |
| 332 } | |
| 333 | |
| 334 /* | |
| 335 * Get the current state of a button on a joystick | |
| 336 */ | |
| 337 Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button) | |
| 338 { | |
| 339 Uint8 state; | |
| 340 | |
| 341 if ( ! ValidJoystick(&joystick) ) { | |
| 342 return(0); | |
| 343 } | |
| 344 if ( button < joystick->nbuttons ) { | |
| 345 state = joystick->buttons[button]; | |
| 346 } else { | |
| 347 SDL_SetError("Joystick only has %d buttons",joystick->nbuttons); | |
| 348 state = 0; | |
| 349 } | |
| 350 return(state); | |
| 351 } | |
| 352 | |
| 353 /* | |
| 354 * Close a joystick previously opened with SDL_JoystickOpen() | |
| 355 */ | |
| 356 void SDL_JoystickClose(SDL_Joystick *joystick) | |
| 357 { | |
| 358 int i; | |
| 359 | |
| 360 if ( ! ValidJoystick(&joystick) ) { | |
| 361 return; | |
| 362 } | |
| 363 | |
| 364 /* First decrement ref count */ | |
| 365 if ( --joystick->ref_count > 0 ) { | |
| 366 return; | |
| 367 } | |
| 368 | |
| 369 /* Lock the event queue - prevent joystick polling */ | |
| 370 SDL_Lock_EventThread(); | |
| 371 | |
| 372 if ( joystick == default_joystick ) { | |
| 373 default_joystick = NULL; | |
| 374 } | |
| 375 SDL_SYS_JoystickClose(joystick); | |
| 376 | |
| 377 /* Remove joystick from list */ | |
| 378 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 379 if ( joystick == SDL_joysticks[i] ) { | |
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380 SDL_memmove(&SDL_joysticks[i], &SDL_joysticks[i+1], |
| 0 | 381 (SDL_numjoysticks-i)*sizeof(joystick)); |
| 382 break; | |
| 383 } | |
| 384 } | |
| 385 | |
| 386 /* Let the event thread keep running */ | |
| 387 SDL_Unlock_EventThread(); | |
| 388 | |
| 389 /* Free the data associated with this joystick */ | |
| 390 if ( joystick->axes ) { | |
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391 SDL_free(joystick->axes); |
| 0 | 392 } |
| 393 if ( joystick->hats ) { | |
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394 SDL_free(joystick->hats); |
| 0 | 395 } |
| 396 if ( joystick->balls ) { | |
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397 SDL_free(joystick->balls); |
| 0 | 398 } |
| 399 if ( joystick->buttons ) { | |
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400 SDL_free(joystick->buttons); |
| 0 | 401 } |
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402 SDL_free(joystick); |
| 0 | 403 } |
| 404 | |
| 405 void SDL_JoystickQuit(void) | |
| 406 { | |
| 407 /* Stop the event polling */ | |
| 408 SDL_Lock_EventThread(); | |
| 409 SDL_numjoysticks = 0; | |
| 410 SDL_Unlock_EventThread(); | |
| 411 | |
| 412 /* Quit the joystick setup */ | |
| 413 SDL_SYS_JoystickQuit(); | |
| 414 if ( SDL_joysticks ) { | |
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415 SDL_free(SDL_joysticks); |
| 0 | 416 SDL_joysticks = NULL; |
| 417 } | |
| 418 } | |
| 419 | |
| 420 | |
| 421 /* These are global for SDL_sysjoystick.c and SDL_events.c */ | |
| 422 | |
| 423 int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value) | |
| 424 { | |
| 425 int posted; | |
| 426 | |
| 427 /* Update internal joystick state */ | |
| 428 joystick->axes[axis] = value; | |
| 429 | |
| 430 /* Post the event, if desired */ | |
| 431 posted = 0; | |
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432 #if !SDL_EVENTS_DISABLED |
| 0 | 433 if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) { |
| 434 SDL_Event event; | |
| 435 event.type = SDL_JOYAXISMOTION; | |
| 436 event.jaxis.which = joystick->index; | |
| 437 event.jaxis.axis = axis; | |
| 438 event.jaxis.value = value; | |
| 439 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 440 posted = 1; | |
| 441 SDL_PushEvent(&event); | |
| 442 } | |
| 443 } | |
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444 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 445 return(posted); |
| 446 } | |
| 447 | |
| 448 int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value) | |
| 449 { | |
| 450 int posted; | |
| 451 | |
| 452 /* Update internal joystick state */ | |
| 453 joystick->hats[hat] = value; | |
| 454 | |
| 455 /* Post the event, if desired */ | |
| 456 posted = 0; | |
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457 #if !SDL_EVENTS_DISABLED |
| 0 | 458 if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) { |
| 459 SDL_Event event; | |
| 460 event.jhat.type = SDL_JOYHATMOTION; | |
| 461 event.jhat.which = joystick->index; | |
| 462 event.jhat.hat = hat; | |
| 463 event.jhat.value = value; | |
| 464 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 465 posted = 1; | |
| 466 SDL_PushEvent(&event); | |
| 467 } | |
| 468 } | |
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469 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 470 return(posted); |
| 471 } | |
| 472 | |
| 473 int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball, | |
| 474 Sint16 xrel, Sint16 yrel) | |
| 475 { | |
| 476 int posted; | |
| 477 | |
| 478 /* Update internal mouse state */ | |
| 479 joystick->balls[ball].dx += xrel; | |
| 480 joystick->balls[ball].dy += yrel; | |
| 481 | |
| 482 /* Post the event, if desired */ | |
| 483 posted = 0; | |
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484 #if !SDL_EVENTS_DISABLED |
| 0 | 485 if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) { |
| 486 SDL_Event event; | |
| 487 event.jball.type = SDL_JOYBALLMOTION; | |
| 488 event.jball.which = joystick->index; | |
| 489 event.jball.ball = ball; | |
| 490 event.jball.xrel = xrel; | |
| 491 event.jball.yrel = yrel; | |
| 492 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 493 posted = 1; | |
| 494 SDL_PushEvent(&event); | |
| 495 } | |
| 496 } | |
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497 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 498 return(posted); |
| 499 } | |
| 500 | |
| 501 int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state) | |
| 502 { | |
| 503 int posted; | |
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504 #if !SDL_EVENTS_DISABLED |
| 0 | 505 SDL_Event event; |
| 506 | |
| 507 switch ( state ) { | |
| 508 case SDL_PRESSED: | |
| 509 event.type = SDL_JOYBUTTONDOWN; | |
| 510 break; | |
| 511 case SDL_RELEASED: | |
| 512 event.type = SDL_JOYBUTTONUP; | |
| 513 break; | |
| 514 default: | |
| 515 /* Invalid state -- bail */ | |
| 516 return(0); | |
| 517 } | |
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518 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 519 |
| 520 /* Update internal joystick state */ | |
| 521 joystick->buttons[button] = state; | |
| 522 | |
| 523 /* Post the event, if desired */ | |
| 524 posted = 0; | |
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525 #if !SDL_EVENTS_DISABLED |
| 0 | 526 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { |
| 527 event.jbutton.which = joystick->index; | |
| 528 event.jbutton.button = button; | |
| 529 event.jbutton.state = state; | |
| 530 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 531 posted = 1; | |
| 532 SDL_PushEvent(&event); | |
| 533 } | |
| 534 } | |
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535 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 536 return(posted); |
| 537 } | |
| 538 | |
| 539 void SDL_JoystickUpdate(void) | |
| 540 { | |
| 541 int i; | |
| 542 | |
| 543 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 544 SDL_SYS_JoystickUpdate(SDL_joysticks[i]); | |
| 545 } | |
| 546 } | |
| 547 | |
| 548 int SDL_JoystickEventState(int state) | |
| 549 { | |
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550 #if SDL_EVENTS_DISABLED |
| 0 | 551 return SDL_IGNORE; |
| 552 #else | |
| 553 const Uint8 event_list[] = { | |
| 554 SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION, | |
| 555 SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, | |
| 556 }; | |
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557 unsigned int i; |
| 0 | 558 |
| 559 switch (state) { | |
| 560 case SDL_QUERY: | |
| 561 state = SDL_IGNORE; | |
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562 for ( i=0; i<SDL_arraysize(event_list); ++i ) { |
| 0 | 563 state = SDL_EventState(event_list[i],SDL_QUERY); |
| 564 if ( state == SDL_ENABLE ) { | |
| 565 break; | |
| 566 } | |
| 567 } | |
| 568 break; | |
| 569 default: | |
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570 for ( i=0; i<SDL_arraysize(event_list); ++i ) { |
| 0 | 571 SDL_EventState(event_list[i], state); |
| 572 } | |
| 573 break; | |
| 574 } | |
| 575 return(state); | |
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576 #endif /* SDL_EVENTS_DISABLED */ |
| 0 | 577 } |