Mercurial > sdl-ios-xcode
annotate src/joystick/win32/SDL_mmjoystick.c @ 834:d37179d10ccc
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 16 Feb 2004 21:15:25 +0000 |
| parents | b8d311d90021 |
| children | 1e6366bde299 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Win32 MultiMedia Joystick driver, contributed by Andrei de A. Formiga */ | |
| 29 | |
| 30 #include <stdlib.h> | |
| 31 #include <stdio.h> /* For the definition of NULL */ | |
| 32 | |
| 33 #include "SDL_error.h" | |
| 34 #include "SDL_joystick.h" | |
| 35 #include "SDL_sysjoystick.h" | |
| 36 #include "SDL_joystick_c.h" | |
| 37 | |
| 38 #include <windows.h> | |
| 39 #include <mmsystem.h> | |
| 40 | |
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41 #define MAX_JOYSTICKS 16 |
| 0 | 42 #define MAX_AXES 6 /* each joystick can have up to 6 axes */ |
| 43 #define MAX_BUTTONS 32 /* and 32 buttons */ | |
| 44 #define AXIS_MIN -32768 /* minimum value for axis coordinate */ | |
| 45 #define AXIS_MAX 32767 /* maximum value for axis coordinate */ | |
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46 /* limit axis to 256 possible positions to filter out noise */ |
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47 #define JOY_AXIS_THRESHOLD (((AXIS_MAX)-(AXIS_MIN))/256) |
| 0 | 48 #define JOY_BUTTON_FLAG(n) (1<<n) |
| 49 | |
| 50 | |
| 51 /* array to hold joystick ID values */ | |
| 52 static UINT SYS_JoystickID[MAX_JOYSTICKS]; | |
| 53 static JOYCAPS SYS_Joystick[MAX_JOYSTICKS]; | |
| 54 | |
| 55 /* The private structure used to keep track of a joystick */ | |
| 56 struct joystick_hwdata | |
| 57 { | |
| 58 /* joystick ID */ | |
| 59 UINT id; | |
| 60 | |
| 61 /* values used to translate device-specific coordinates into | |
| 62 SDL-standard ranges */ | |
| 63 struct _transaxis { | |
| 64 int offset; | |
| 65 float scale; | |
| 66 } transaxis[6]; | |
| 67 }; | |
| 68 | |
| 69 /* Convert a win32 Multimedia API return code to a text message */ | |
| 70 static void SetMMerror(char *function, int code); | |
| 71 | |
| 72 | |
| 73 /* Function to scan the system for joysticks. | |
| 74 * This function should set SDL_numjoysticks to the number of available | |
| 75 * joysticks. Joystick 0 should be the system default joystick. | |
| 76 * It should return 0, or -1 on an unrecoverable fatal error. | |
| 77 */ | |
| 78 int SDL_SYS_JoystickInit(void) | |
| 79 { | |
| 80 int i; | |
| 81 int maxdevs; | |
| 82 int numdevs; | |
| 83 JOYINFOEX joyinfo; | |
| 84 JOYCAPS joycaps; | |
| 85 MMRESULT result; | |
| 86 | |
| 87 numdevs = 0; | |
| 88 maxdevs = joyGetNumDevs(); | |
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89 |
| 0 | 90 if ( maxdevs > MAX_JOYSTICKS ) { |
| 91 maxdevs = MAX_JOYSTICKS; | |
| 92 } | |
| 93 | |
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94 |
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95 for ( i = 0; i < MAX_JOYSTICKS; i++ ) { |
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96 SYS_JoystickID[i] = JOYSTICKID1 + i; |
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97 } |
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98 |
| 0 | 99 |
| 100 for ( i = 0; (i < maxdevs); ++i ) { | |
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101 |
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102 /* added 8/31/2001 By Vitaliy Mikitchenko */ |
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103 joyinfo.dwSize = sizeof(joyinfo); |
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104 joyinfo.dwFlags = JOY_RETURNALL; |
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105 /* end addition */ |
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106 |
| 0 | 107 result = joyGetPosEx(SYS_JoystickID[i], &joyinfo); |
| 108 if ( result == JOYERR_NOERROR ) { | |
| 109 result = joyGetDevCaps(SYS_JoystickID[i], &joycaps, sizeof(joycaps)); | |
| 110 if ( result == JOYERR_NOERROR ) { | |
| 111 SYS_JoystickID[numdevs] = SYS_JoystickID[i]; | |
| 112 SYS_Joystick[numdevs] = joycaps; | |
| 113 numdevs++; | |
| 114 } | |
| 115 } | |
| 116 } | |
| 117 return(numdevs); | |
| 118 } | |
| 119 | |
| 120 /* Function to get the device-dependent name of a joystick */ | |
| 121 const char *SDL_SYS_JoystickName(int index) | |
| 122 { | |
| 123 /***-> test for invalid index ? */ | |
| 124 return(SYS_Joystick[index].szPname); | |
| 125 } | |
| 126 | |
| 127 /* Function to open a joystick for use. | |
| 128 The joystick to open is specified by the index field of the joystick. | |
| 129 This should fill the nbuttons and naxes fields of the joystick structure. | |
| 130 It returns 0, or -1 if there is an error. | |
| 131 */ | |
| 132 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick) | |
| 133 { | |
| 134 int index, i; | |
| 135 int caps_flags[MAX_AXES-2] = | |
| 136 { JOYCAPS_HASZ, JOYCAPS_HASR, JOYCAPS_HASU, JOYCAPS_HASV }; | |
| 137 int axis_min[MAX_AXES], axis_max[MAX_AXES]; | |
| 138 | |
| 139 | |
| 140 /* shortcut */ | |
| 141 index = joystick->index; | |
| 142 axis_min[0] = SYS_Joystick[index].wXmin; | |
| 143 axis_max[0] = SYS_Joystick[index].wXmax; | |
| 144 axis_min[1] = SYS_Joystick[index].wYmin; | |
| 145 axis_max[1] = SYS_Joystick[index].wYmax; | |
| 146 axis_min[2] = SYS_Joystick[index].wZmin; | |
| 147 axis_max[2] = SYS_Joystick[index].wZmax; | |
| 148 axis_min[3] = SYS_Joystick[index].wRmin; | |
| 149 axis_max[3] = SYS_Joystick[index].wRmax; | |
| 150 axis_min[4] = SYS_Joystick[index].wUmin; | |
| 151 axis_max[4] = SYS_Joystick[index].wUmax; | |
| 152 axis_min[5] = SYS_Joystick[index].wVmin; | |
| 153 axis_max[5] = SYS_Joystick[index].wVmax; | |
| 154 | |
| 155 /* allocate memory for system specific hardware data */ | |
| 156 joystick->hwdata = (struct joystick_hwdata *) malloc(sizeof(*joystick->hwdata)); | |
| 157 if (joystick->hwdata == NULL) | |
| 158 { | |
| 159 SDL_OutOfMemory(); | |
| 160 return(-1); | |
| 161 } | |
| 162 memset(joystick->hwdata, 0, sizeof(*joystick->hwdata)); | |
| 163 | |
| 164 /* set hardware data */ | |
| 165 joystick->hwdata->id = SYS_JoystickID[index]; | |
| 166 for ( i = 0; i < MAX_AXES; ++i ) { | |
| 167 if ( (i<2) || (SYS_Joystick[index].wCaps & caps_flags[i-2]) ) { | |
| 168 joystick->hwdata->transaxis[i].offset = | |
| 169 AXIS_MIN - axis_min[i]; | |
| 170 joystick->hwdata->transaxis[i].scale = | |
| 171 (float)(AXIS_MAX - AXIS_MIN) / (axis_max[i] - axis_min[i]); | |
| 172 } else { | |
| 173 joystick->hwdata->transaxis[i].offset = 0; | |
| 174 joystick->hwdata->transaxis[i].scale = 1.0; /* Just in case */ | |
| 175 } | |
| 176 } | |
| 177 | |
| 178 /* fill nbuttons, naxes, and nhats fields */ | |
| 179 joystick->nbuttons = SYS_Joystick[index].wNumButtons; | |
| 180 joystick->naxes = SYS_Joystick[index].wNumAxes; | |
| 181 if ( SYS_Joystick[index].wCaps & JOYCAPS_HASPOV ) { | |
| 182 joystick->nhats = 1; | |
| 183 } else { | |
| 184 joystick->nhats = 0; | |
| 185 } | |
| 186 return(0); | |
| 187 } | |
| 188 | |
| 189 static Uint8 TranslatePOV(DWORD value) | |
| 190 { | |
| 191 Uint8 pos; | |
| 192 | |
| 193 pos = SDL_HAT_CENTERED; | |
| 194 if ( value != JOY_POVCENTERED ) { | |
| 195 if ( (value > JOY_POVLEFT) || (value < JOY_POVRIGHT) ) { | |
| 196 pos |= SDL_HAT_UP; | |
| 197 } | |
| 198 if ( (value > JOY_POVFORWARD) && (value < JOY_POVBACKWARD) ) { | |
| 199 pos |= SDL_HAT_RIGHT; | |
| 200 } | |
| 201 if ( (value > JOY_POVRIGHT) && (value < JOY_POVLEFT) ) { | |
| 202 pos |= SDL_HAT_DOWN; | |
| 203 } | |
| 204 if ( value > JOY_POVBACKWARD ) { | |
| 205 pos |= SDL_HAT_LEFT; | |
| 206 } | |
| 207 } | |
| 208 return(pos); | |
| 209 } | |
| 210 | |
| 211 /* Function to update the state of a joystick - called as a device poll. | |
| 212 * This function shouldn't update the joystick structure directly, | |
| 213 * but instead should call SDL_PrivateJoystick*() to deliver events | |
| 214 * and update joystick device state. | |
| 215 */ | |
| 216 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick) | |
| 217 { | |
| 218 MMRESULT result; | |
| 219 int i; | |
| 220 DWORD flags[MAX_AXES] = { JOY_RETURNX, JOY_RETURNY, JOY_RETURNZ, | |
| 221 JOY_RETURNR, JOY_RETURNU, JOY_RETURNV }; | |
| 222 DWORD pos[MAX_AXES]; | |
| 223 struct _transaxis *transaxis; | |
| 224 int value, change; | |
| 225 JOYINFOEX joyinfo; | |
| 226 | |
| 227 joyinfo.dwSize = sizeof(joyinfo); | |
| 228 joyinfo.dwFlags = JOY_RETURNALL|JOY_RETURNPOVCTS; | |
| 229 if ( ! joystick->hats ) { | |
| 230 joyinfo.dwFlags &= ~(JOY_RETURNPOV|JOY_RETURNPOVCTS); | |
| 231 } | |
| 232 result = joyGetPosEx(joystick->hwdata->id, &joyinfo); | |
| 233 if ( result != JOYERR_NOERROR ) { | |
| 234 SetMMerror("joyGetPosEx", result); | |
| 235 return; | |
| 236 } | |
| 237 | |
| 238 /* joystick motion events */ | |
| 239 pos[0] = joyinfo.dwXpos; | |
| 240 pos[1] = joyinfo.dwYpos; | |
| 241 pos[2] = joyinfo.dwZpos; | |
| 242 pos[3] = joyinfo.dwRpos; | |
| 243 pos[4] = joyinfo.dwUpos; | |
| 244 pos[5] = joyinfo.dwVpos; | |
| 245 | |
| 246 transaxis = joystick->hwdata->transaxis; | |
| 247 for (i = 0; i < joystick->naxes; i++) { | |
| 248 if (joyinfo.dwFlags & flags[i]) { | |
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249 value = (int)(((float)pos[i] + transaxis[i].offset) * transaxis[i].scale); |
| 0 | 250 change = (value - joystick->axes[i]); |
| 251 if ( (change < -JOY_AXIS_THRESHOLD) || (change > JOY_AXIS_THRESHOLD) ) { | |
| 252 SDL_PrivateJoystickAxis(joystick, (Uint8)i, (Sint16)value); | |
| 253 } | |
| 254 } | |
| 255 } | |
| 256 | |
| 257 /* joystick button events */ | |
| 258 if ( joyinfo.dwFlags & JOY_RETURNBUTTONS ) { | |
| 259 for ( i = 0; i < joystick->nbuttons; ++i ) { | |
| 260 if ( joyinfo.dwButtons & JOY_BUTTON_FLAG(i) ) { | |
| 261 if ( ! joystick->buttons[i] ) { | |
| 262 SDL_PrivateJoystickButton(joystick, (Uint8)i, SDL_PRESSED); | |
| 263 } | |
| 264 } else { | |
| 265 if ( joystick->buttons[i] ) { | |
| 266 SDL_PrivateJoystickButton(joystick, (Uint8)i, SDL_RELEASED); | |
| 267 } | |
| 268 } | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 /* joystick hat events */ | |
| 273 if ( joyinfo.dwFlags & JOY_RETURNPOV ) { | |
| 274 Uint8 pos; | |
| 275 | |
| 276 pos = TranslatePOV(joyinfo.dwPOV); | |
| 277 if ( pos != joystick->hats[0] ) { | |
| 278 SDL_PrivateJoystickHat(joystick, 0, pos); | |
| 279 } | |
| 280 } | |
| 281 } | |
| 282 | |
| 283 /* Function to close a joystick after use */ | |
| 284 void SDL_SYS_JoystickClose(SDL_Joystick *joystick) | |
| 285 { | |
| 286 if (joystick->hwdata != NULL) { | |
| 287 /* free system specific hardware data */ | |
| 288 free(joystick->hwdata); | |
| 289 } | |
| 290 } | |
| 291 | |
| 292 /* Function to perform any system-specific joystick related cleanup */ | |
| 293 void SDL_SYS_JoystickQuit(void) | |
| 294 { | |
| 295 return; | |
| 296 } | |
| 297 | |
| 298 | |
| 299 /* implementation functions */ | |
| 300 void SetMMerror(char *function, int code) | |
| 301 { | |
| 302 static char *error; | |
| 303 static char errbuf[BUFSIZ]; | |
| 304 | |
| 305 errbuf[0] = 0; | |
| 306 switch (code) | |
| 307 { | |
| 308 case MMSYSERR_NODRIVER: | |
| 309 error = "Joystick driver not present"; | |
| 310 break; | |
| 311 | |
| 312 case MMSYSERR_INVALPARAM: | |
| 313 case JOYERR_PARMS: | |
| 314 error = "Invalid parameter(s)"; | |
| 315 break; | |
| 316 | |
| 317 case MMSYSERR_BADDEVICEID: | |
| 318 error = "Bad device ID"; | |
| 319 break; | |
| 320 | |
| 321 case JOYERR_UNPLUGGED: | |
| 322 error = "Joystick not attached"; | |
| 323 break; | |
| 324 | |
| 325 case JOYERR_NOCANDO: | |
| 326 error = "Can't capture joystick input"; | |
| 327 break; | |
| 328 | |
| 329 default: | |
| 330 sprintf(errbuf, "%s: Unknown Multimedia system error: 0x%x", | |
| 331 function, code); | |
| 332 break; | |
| 333 } | |
| 334 | |
| 335 if ( ! errbuf[0] ) { | |
| 336 sprintf(errbuf, "%s: %s", function, error); | |
| 337 } | |
| 338 SDL_SetError("%s", errbuf); | |
| 339 } |