src/glut/glx/glut_input.c

   1
   2 /* Copyright (c) Mark J. Kilgard, 1994, 1997, 1998. */
   3
   4 /* This program is freely distributable without licensing fees
   5    and is provided without guarantee or warrantee expressed or
   6    implied. This program is -not- in the public domain. */
   7
   8 #ifdef __VMS
   9 #include <GL/vms_x_fix.h>
  10 #endif
  11
  12 #include <assert.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16
  17 #if !defined(_WIN32)
  18 #include <X11/Xlib.h>
  19 #if defined(__vms)
  20 #include <X11/XInput.h>
  21 #else
  22 #include <X11/extensions/XInput.h>
  23 #endif
  24 #include <X11/Xutil.h>
  25 #else
  26 #ifdef __MINGW32__
  27 #include <GL/gl.h>
  28 #endif
  29 #include <windows.h>
  30 #ifndef __CYGWIN32__
  31 #include <mmsystem.h>  /* Win32 Multimedia API header. */
  32 #endif
  33 #endif /* !_WIN32 */
  34
  35 #include "glutint.h"
  36
  37 int __glutNumDials = 0;
  38 int __glutNumSpaceballButtons = 0;
  39 int __glutNumButtonBoxButtons = 0;
  40 int __glutNumTabletButtons = 0;
  41 int __glutNumMouseButtons = 3;  /* Good guess. */
  42 XDevice *__glutTablet = NULL;
  43 XDevice *__glutDials = NULL;
  44 XDevice *__glutSpaceball = NULL;
  45
  46 int __glutHasJoystick = 0;
  47 int __glutNumJoystickButtons = 0;
  48 int __glutNumJoystickAxes = 0;
  49
  50 #if !defined(_WIN32)
  51 typedef struct _Range {
  52   int min;
  53   int range;
  54 } Range;
  55
  56 #define NUM_SPACEBALL_AXIS      6
  57 #define NUM_TABLET_AXIS         2
  58 #define NUM_DIALS_AXIS          8
  59
  60 Range __glutSpaceballRange[NUM_SPACEBALL_AXIS];
  61 Range __glutTabletRange[NUM_TABLET_AXIS];
  62 int *__glutDialsResolution;
  63
  64 /* Safely assumes 0 is an illegal event type for X Input
  65    extension events. */
  66 int __glutDeviceMotionNotify = 0;
  67 int __glutDeviceButtonPress = 0;
  68 int __glutDeviceButtonPressGrab = 0;
  69 int __glutDeviceButtonRelease = 0;
  70 int __glutDeviceStateNotify = 0;
  71
  72 static int
  73 normalizeTabletPos(int axis, int rawValue)
  74 {
  75   assert(rawValue >= __glutTabletRange[axis].min);
  76   assert(rawValue <= __glutTabletRange[axis].min
  77     + __glutTabletRange[axis].range);
  78   /* Normalize rawValue to between 0 and 4000. */
  79   return ((rawValue - __glutTabletRange[axis].min) * 4000) /
  80     __glutTabletRange[axis].range;
  81 }
  82
  83 static int
  84 normalizeDialAngle(int axis, int rawValue)
  85 {
  86   /* XXX Assumption made that the resolution of the device is
  87      number of clicks for one complete dial revolution.  This
  88      is true for SGI's dial & button box. */
  89   return (rawValue * 360.0) / __glutDialsResolution[axis];
  90 }
  91
  92 static int
  93 normalizeSpaceballAngle(int axis, int rawValue)
  94 {
  95   assert(rawValue >= __glutSpaceballRange[axis].min);
  96   assert(rawValue <= __glutSpaceballRange[axis].min +
  97     __glutSpaceballRange[axis].range);
  98   /* Normalize rawValue to between -1800 and 1800. */
  99   return ((rawValue - __glutSpaceballRange[axis].min) * 3600) /
 100     __glutSpaceballRange[axis].range - 1800;
 101 }
 102
 103 static int
 104 normalizeSpaceballDelta(int axis, int rawValue)
 105 {
 106   assert(rawValue >= __glutSpaceballRange[axis].min);
 107   assert(rawValue <= __glutSpaceballRange[axis].min +
 108     __glutSpaceballRange[axis].range);
 109   /* Normalize rawValue to between -1000 and 1000. */
 110   return ((rawValue - __glutSpaceballRange[axis].min) * 2000) /
 111     __glutSpaceballRange[axis].range - 1000;
 112 }
 113
 114 static void
 115 queryTabletPos(GLUTwindow * window)
 116 {
 117   XDeviceState *state;
 118   XInputClass *any;
 119   XValuatorState *v;
 120   int i;
 121
 122   state = XQueryDeviceState(__glutDisplay, __glutTablet);
 123   any = state->data;
 124   for (i = 0; i < state->num_classes; i++) {
 125 #if defined(__cplusplus) || defined(c_plusplus)
 126     switch (any->c_class) {
 127 #else
 128     switch (any->class) {
 129 #endif
 130     case ValuatorClass:
 131       v = (XValuatorState *) any;
 132       if (v->num_valuators < 2)
 133         goto end;
 134       if (window->tabletPos[0] == -1)
 135         window->tabletPos[0] = normalizeTabletPos(0, v->valuators[0]);
 136       if (window->tabletPos[1] == -1)
 137         window->tabletPos[1] = normalizeTabletPos(1, v->valuators[1]);
 138     }
 139     any = (XInputClass *) ((char *) any + any->length);
 140   }
 141 end:
 142   XFreeDeviceState(state);
 143 }
 144
 145 static void
 146 tabletPosChange(GLUTwindow * window, int first, int count, int *data)
 147 {
 148   int i, value, genEvent = 0;
 149
 150   for (i = first; i < first + count; i++) {
 151     switch (i) {
 152     case 0:            /* X axis */
 153     case 1:            /* Y axis */
 154       value = normalizeTabletPos(i, data[i - first]);
 155       if (value != window->tabletPos[i]) {
 156         window->tabletPos[i] = value;
 157         genEvent = 1;
 158       }
 159       break;
 160     }
 161   }
 162   if (window->tabletPos[0] == -1 || window->tabletPos[1] == -1)
 163     queryTabletPos(window);
 164   if (genEvent)
 165     window->tabletMotion(window->tabletPos[0], window->tabletPos[1]);
 166 }
 167 #endif /* !_WIN32 */
 168
 169 static int
 170 __glutProcessDeviceEvents(XEvent * event)
 171 {
 172 #if !defined(_WIN32)
 173   GLUTwindow *window;
 174
 175   /* XXX Ugly code fan out. */
 176
 177   /* Can't use switch/case since X Input event types are
 178      dynamic. */
 179
 180   if (__glutDeviceMotionNotify && event->type == __glutDeviceMotionNotify) {
 181     XDeviceMotionEvent *devmot = (XDeviceMotionEvent *) event;
 182
 183     window = __glutGetWindow(devmot->window);
 184     if (window) {
 185       if (__glutTablet
 186         && devmot->deviceid == __glutTablet->device_id
 187         && window->tabletMotion) {
 188         tabletPosChange(window, devmot->first_axis, devmot->axes_count,
 189           devmot->axis_data);
 190       } else if (__glutDials
 191           && devmot->deviceid == __glutDials->device_id
 192         && window->dials) {
 193         int i, first = devmot->first_axis, count = devmot->axes_count;
 194
 195         for (i = first; i < first + count; i++)
 196           window->dials(i + 1,
 197             normalizeDialAngle(i, devmot->axis_data[i - first]));
 198       } else if (__glutSpaceball
 199         && devmot->deviceid == __glutSpaceball->device_id) {
 200         /* XXX Assume that space ball motion events come in as
 201            all the first 6 axes.  Assume first 3 axes are XYZ
 202            translations; second 3 axes are XYZ rotations. */
 203         if (devmot->first_axis == 0 && devmot->axes_count == 6) {
 204           if (window->spaceMotion)
 205             window->spaceMotion(
 206               normalizeSpaceballDelta(0, devmot->axis_data[0]),
 207               normalizeSpaceballDelta(1, devmot->axis_data[1]),
 208               normalizeSpaceballDelta(2, devmot->axis_data[2]));
 209           if (window->spaceRotate)
 210             window->spaceRotate(
 211               normalizeSpaceballAngle(3, devmot->axis_data[3]),
 212               normalizeSpaceballAngle(4, devmot->axis_data[4]),
 213               normalizeSpaceballAngle(5, devmot->axis_data[5]));
 214         }
 215       }
 216       return 1;
 217     }
 218   } else if (__glutDeviceButtonPress
 219     && event->type == __glutDeviceButtonPress) {
 220     XDeviceButtonEvent *devbtn = (XDeviceButtonEvent *) event;
 221
 222     window = __glutGetWindow(devbtn->window);
 223     if (window) {
 224       if (__glutTablet
 225         && devbtn->deviceid == __glutTablet->device_id
 226         && window->tabletButton
 227         && devbtn->first_axis == 0
 228         && devbtn->axes_count == 2) {
 229         tabletPosChange(window, devbtn->first_axis, devbtn->axes_count,
 230           devbtn->axis_data);
 231         window->tabletButton(devbtn->button, GLUT_DOWN,
 232           window->tabletPos[0], window->tabletPos[1]);
 233       } else if (__glutDials
 234           && devbtn->deviceid == __glutDials->device_id
 235         && window->buttonBox) {
 236         window->buttonBox(devbtn->button, GLUT_DOWN);
 237       } else if (__glutSpaceball
 238           && devbtn->deviceid == __glutSpaceball->device_id
 239         && window->spaceButton) {
 240         window->spaceButton(devbtn->button, GLUT_DOWN);
 241       }
 242       return 1;
 243     }
 244   } else if (__glutDeviceButtonRelease
 245     && event->type == __glutDeviceButtonRelease) {
 246     XDeviceButtonEvent *devbtn = (XDeviceButtonEvent *) event;
 247
 248     window = __glutGetWindow(devbtn->window);
 249     if (window) {
 250       if (__glutTablet
 251         && devbtn->deviceid == __glutTablet->device_id
 252         && window->tabletButton
 253         && devbtn->first_axis == 0
 254         && devbtn->axes_count == 2) {
 255         tabletPosChange(window, devbtn->first_axis, devbtn->axes_count,
 256           devbtn->axis_data);
 257         window->tabletButton(devbtn->button, GLUT_UP,
 258           window->tabletPos[0], window->tabletPos[1]);
 259       } else if (__glutDials
 260           && devbtn->deviceid == __glutDials->device_id
 261         && window->buttonBox) {
 262         window->buttonBox(devbtn->button, GLUT_UP);
 263       } else if (__glutSpaceball
 264           && devbtn->deviceid == __glutSpaceball->device_id
 265         && window->spaceButton) {
 266         window->spaceButton(devbtn->button, GLUT_UP);
 267       }
 268       return 1;
 269     }
 270   }
 271 #else
 272   {
 273     JOYINFOEX info;
 274     JOYCAPS joyCaps;
 275
 276     memset(&info, 0, sizeof(JOYINFOEX));
 277     info.dwSize = sizeof(JOYINFOEX);
 278     info.dwFlags = JOY_RETURNALL;
 279
 280     if (joyGetPosEx(JOYSTICKID1,&info) != JOYERR_NOERROR) {
 281       __glutHasJoystick = 1;
 282       joyGetDevCaps(JOYSTICKID1, &joyCaps, sizeof(joyCaps));
 283       __glutNumJoystickButtons = joyCaps.wNumButtons;
 284       __glutNumJoystickAxes = joyCaps.wNumAxes;
 285     } else {
 286       __glutHasJoystick = 0;
 287       __glutNumJoystickButtons = 0;
 288       __glutNumJoystickAxes = 0;
 289     }
 290   }
 291 #endif /* !_WIN32 */
 292   return 0;
 293 }
 294
 295 static GLUTeventParser eventParser =
 296 {__glutProcessDeviceEvents, NULL};
 297
 298 static void
 299 addDeviceEventParser(void)
 300 {
 301   static Bool been_here = False;
 302
 303   if (been_here)
 304     return;
 305   been_here = True;
 306   __glutRegisterEventParser(&eventParser);
 307 }
 308
 309 static int
 310 probeDevices(void)
 311 {
 312   static Bool been_here = False;
 313   static int support;
 314 #if !defined(_WIN32)
 315   XExtensionVersion *version;
 316   XDeviceInfoPtr device_info, device;
 317   XAnyClassPtr any;
 318   XButtonInfoPtr b;
 319   XValuatorInfoPtr v;
 320   XAxisInfoPtr a;
 321   int num_dev = 0, btns = 0, dials = 0;
 322   int i, j, k;
 323 #endif /* !_WIN32 */
 324
 325   if (been_here) {
 326     return support;
 327   }
 328   been_here = True;
 329
 330 #if !defined(_WIN32)
 331   version = XGetExtensionVersion(__glutDisplay, "XInputExtension");
 332   /* Ugh.  XInput extension API forces annoying cast of a pointer
 333      to a long so it can be compared with the NoSuchExtension
 334      value (#defined to 1). */
 335   if (version == NULL || ((long) version) == NoSuchExtension) {
 336     support = 0;
 337     return support;
 338   }
 339   XFree(version);
 340   device_info = XListInputDevices(__glutDisplay, &num_dev);
 341   if (device_info) {
 342     for (i = 0; i < num_dev; i++) {
 343       /* XXX These are SGI names for these devices;
 344          unfortunately, no good standard exists for standard
 345          types of X input extension devices. */
 346
 347       device = &device_info[i];
 348       any = (XAnyClassPtr) device->inputclassinfo;
 349
 350       if (!__glutSpaceball && !strcmp(device->name, "spaceball")) {
 351         v = NULL;
 352         b = NULL;
 353         for (j = 0; j < device->num_classes; j++) {
 354 #if defined(__cplusplus) || defined(c_plusplus)
 355           switch (any->c_class) {
 356 #else
 357           switch (any->class) {
 358 #endif
 359           case ButtonClass:
 360             b = (XButtonInfoPtr) any;
 361             btns = b->num_buttons;
 362             break;
 363           case ValuatorClass:
 364             v = (XValuatorInfoPtr) any;
 365             /* Sanity check: at least 6 valuators? */
 366             if (v->num_axes < NUM_SPACEBALL_AXIS)
 367               goto skip_device;
 368             a = (XAxisInfoPtr) ((char *) v + sizeof(XValuatorInfo));
 369             for (k = 0; k < NUM_SPACEBALL_AXIS; k++, a++) {
 370               __glutSpaceballRange[k].min = a->min_value;
 371               __glutSpaceballRange[k].range = a->max_value - a->min_value;
 372             }
 373             break;
 374           }
 375           any = (XAnyClassPtr) ((char *) any + any->length);
 376         }
 377         if (v) {
 378           __glutSpaceball = XOpenDevice(__glutDisplay, device->id);
 379           if (__glutSpaceball) {
 380             __glutNumSpaceballButtons = btns;
 381             addDeviceEventParser();
 382           }
 383         }
 384       } else if (!__glutDials && !strcmp(device->name, "dial+buttons")) {
 385         v = NULL;
 386         b = NULL;
 387         for (j = 0; j < device->num_classes; j++) {
 388 #if defined(__cplusplus) || defined(c_plusplus)
 389           switch (any->c_class) {
 390 #else
 391           switch (any->class) {
 392 #endif
 393           case ButtonClass:
 394             b = (XButtonInfoPtr) any;
 395             btns = b->num_buttons;
 396             break;
 397           case ValuatorClass:
 398             v = (XValuatorInfoPtr) any;
 399             /* Sanity check: at least 8 valuators? */
 400             if (v->num_axes < NUM_DIALS_AXIS)
 401               goto skip_device;
 402             dials = v->num_axes;
 403             __glutDialsResolution = (int *) malloc(sizeof(int) * dials);
 404             a = (XAxisInfoPtr) ((char *) v + sizeof(XValuatorInfo));
 405             for (k = 0; k < dials; k++, a++) {
 406               __glutDialsResolution[k] = a->resolution;
 407             }
 408             break;
 409           }
 410           any = (XAnyClassPtr) ((char *) any + any->length);
 411         }
 412         if (v) {
 413           __glutDials = XOpenDevice(__glutDisplay, device->id);
 414           if (__glutDials) {
 415             __glutNumButtonBoxButtons = btns;
 416             __glutNumDials = dials;
 417             addDeviceEventParser();
 418           }
 419         }
 420       } else if (!__glutTablet && !strcmp(device->name, "tablet")) {
 421         v = NULL;
 422         b = NULL;
 423         for (j = 0; j < device->num_classes; j++) {
 424 #if defined(__cplusplus) || defined(c_plusplus)
 425           switch (any->c_class) {
 426 #else
 427           switch (any->class) {
 428 #endif
 429           case ButtonClass:
 430             b = (XButtonInfoPtr) any;
 431             btns = b->num_buttons;
 432             break;
 433           case ValuatorClass:
 434             v = (XValuatorInfoPtr) any;
 435             /* Sanity check: exactly 2 valuators? */
 436             if (v->num_axes != NUM_TABLET_AXIS)
 437               goto skip_device;
 438             a = (XAxisInfoPtr) ((char *) v + sizeof(XValuatorInfo));
 439             for (k = 0; k < NUM_TABLET_AXIS; k++, a++) {
 440               __glutTabletRange[k].min = a->min_value;
 441               __glutTabletRange[k].range = a->max_value - a->min_value;
 442             }
 443             break;
 444           }
 445           any = (XAnyClassPtr) ((char *) any + any->length);
 446         }
 447         if (v) {
 448           __glutTablet = XOpenDevice(__glutDisplay, device->id);
 449           if (__glutTablet) {
 450             __glutNumTabletButtons = btns;
 451             addDeviceEventParser();
 452           }
 453         }
 454       } else if (!strcmp(device->name, "mouse")) {
 455         for (j = 0; j < device->num_classes; j++) {
 456 #if defined(__cplusplus) || defined(c_plusplus)
 457           if (any->c_class == ButtonClass) {
 458 #else
 459           if (any->class == ButtonClass) {
 460 #endif
 461             b = (XButtonInfoPtr) any;
 462             __glutNumMouseButtons = b->num_buttons;
 463           }
 464           any = (XAnyClassPtr) ((char *) any + any->length);
 465         }
 466       }
 467     skip_device:;
 468     }
 469     XFreeDeviceList(device_info);
 470   }
 471 #else /* _WIN32 */
 472   __glutNumMouseButtons = GetSystemMetrics(SM_CMOUSEBUTTONS);
 473 #endif /* !_WIN32 */
 474   /* X Input extension might be supported, but only if there is
 475      a tablet, dials, or spaceball do we claim devices are
 476      supported. */
 477   support = __glutTablet || __glutDials || __glutSpaceball;
 478   return support;
 479 }
 480
 481 void
 482 __glutUpdateInputDeviceMask(GLUTwindow * window)
 483 {
 484 #if !defined(_WIN32)
 485   /* 5 (dial and buttons) + 5 (tablet locator and buttons) + 5
 486      (Spaceball buttons and axis) = 15 */
 487   XEventClass eventList[15];
 488   int rc, numEvents;
 489
 490   rc = probeDevices();
 491   if (rc) {
 492     numEvents = 0;
 493     if (__glutTablet) {
 494       if (window->tabletMotion) {
 495         DeviceMotionNotify(__glutTablet, __glutDeviceMotionNotify,
 496           eventList[numEvents]);
 497         numEvents++;
 498       }
 499       if (window->tabletButton) {
 500         DeviceButtonPress(__glutTablet, __glutDeviceButtonPress,
 501           eventList[numEvents]);
 502         numEvents++;
 503         DeviceButtonPressGrab(__glutTablet, __glutDeviceButtonPressGrab,
 504           eventList[numEvents]);
 505         numEvents++;
 506         DeviceButtonRelease(__glutTablet, __glutDeviceButtonRelease,
 507           eventList[numEvents]);
 508         numEvents++;
 509       }
 510       if (window->tabletMotion || window->tabletButton) {
 511         DeviceStateNotify(__glutTablet, __glutDeviceStateNotify,
 512           eventList[numEvents]);
 513         numEvents++;
 514       }
 515     }
 516     if (__glutDials) {
 517       if (window->dials) {
 518         DeviceMotionNotify(__glutDials, __glutDeviceMotionNotify,
 519           eventList[numEvents]);
 520         numEvents++;
 521       }
 522       if (window->buttonBox) {
 523         DeviceButtonPress(__glutDials, __glutDeviceButtonPress,
 524           eventList[numEvents]);
 525         numEvents++;
 526         DeviceButtonPressGrab(__glutDials, __glutDeviceButtonPressGrab,
 527           eventList[numEvents]);
 528         numEvents++;
 529         DeviceButtonRelease(__glutDials, __glutDeviceButtonRelease,
 530           eventList[numEvents]);
 531         numEvents++;
 532       }
 533       if (window->dials || window->buttonBox) {
 534         DeviceStateNotify(__glutDials, __glutDeviceStateNotify,
 535           eventList[numEvents]);
 536         numEvents++;
 537       }
 538     }
 539     if (__glutSpaceball) {
 540       if (window->spaceMotion || window->spaceRotate) {
 541         DeviceMotionNotify(__glutSpaceball, __glutDeviceMotionNotify,
 542           eventList[numEvents]);
 543         numEvents++;
 544       }
 545       if (window->spaceButton) {
 546         DeviceButtonPress(__glutSpaceball, __glutDeviceButtonPress,
 547           eventList[numEvents]);
 548         numEvents++;
 549         DeviceButtonPressGrab(__glutSpaceball, __glutDeviceButtonPressGrab,
 550           eventList[numEvents]);
 551         numEvents++;
 552         DeviceButtonRelease(__glutSpaceball, __glutDeviceButtonRelease,
 553           eventList[numEvents]);
 554         numEvents++;
 555       }
 556       if (window->spaceMotion || window->spaceRotate || window->spaceButton) {
 557         DeviceStateNotify(__glutSpaceball, __glutDeviceStateNotify,
 558           eventList[numEvents]);
 559         numEvents++;
 560       }
 561     }
 562 #if 0
 563     if (window->children) {
 564       GLUTwindow *child = window->children;
 565
 566       do {
 567         XChangeDeviceDontPropagateList(__glutDisplay, child->win,
 568           numEvents, eventList, AddToList);
 569         child = child->siblings;
 570       } while (child);
 571     }
 572 #endif
 573     XSelectExtensionEvent(__glutDisplay, window->win,
 574       eventList, numEvents);
 575     if (window->overlay) {
 576       XSelectExtensionEvent(__glutDisplay, window->overlay->win,
 577         eventList, numEvents);
 578     }
 579   } else {
 580     /* X Input extension not supported; no chance for exotic
 581        input devices. */
 582   }
 583 #endif /* !_WIN32 */
 584 }
 585
 586 /* CENTRY */
 587 int GLUTAPIENTRY
 588 glutDeviceGet(GLenum param)
 589 {
 590   probeDevices();
 591   switch (param) {
 592   case GLUT_HAS_KEYBOARD:
 593   case GLUT_HAS_MOUSE:
 594     /* Assume window system always has mouse and keyboard. */
 595     return 1;
 596   case GLUT_HAS_SPACEBALL:
 597     return __glutSpaceball != NULL;
 598   case GLUT_HAS_DIAL_AND_BUTTON_BOX:
 599     return __glutDials != NULL;
 600   case GLUT_HAS_TABLET:
 601     return __glutTablet != NULL;
 602   case GLUT_NUM_MOUSE_BUTTONS:
 603     return __glutNumMouseButtons;
 604   case GLUT_NUM_SPACEBALL_BUTTONS:
 605     return __glutNumSpaceballButtons;
 606   case GLUT_NUM_BUTTON_BOX_BUTTONS:
 607     return __glutNumButtonBoxButtons;
 608   case GLUT_NUM_DIALS:
 609     return __glutNumDials;
 610   case GLUT_NUM_TABLET_BUTTONS:
 611     return __glutNumTabletButtons;
 612   case GLUT_DEVICE_IGNORE_KEY_REPEAT:
 613     return __glutCurrentWindow->ignoreKeyRepeat;
 614 #ifndef _WIN32
 615   case GLUT_DEVICE_KEY_REPEAT:
 616     {
 617       XKeyboardState state;
 618
 619       XGetKeyboardControl(__glutDisplay, &state);
 620       return state.global_auto_repeat;
 621     }
 622   case GLUT_JOYSTICK_POLL_RATE:
 623     return 0;
 624 #else
 625   case GLUT_DEVICE_KEY_REPEAT:
 626     /* Win32 cannot globally disable key repeat. */
 627     return GLUT_KEY_REPEAT_ON;
 628   case GLUT_JOYSTICK_POLL_RATE:
 629     return __glutCurrentWindow->joyPollInterval;
 630 #endif
 631   case GLUT_HAS_JOYSTICK:
 632     return __glutHasJoystick;
 633   case GLUT_JOYSTICK_BUTTONS:
 634     return __glutNumJoystickButtons;
 635   case GLUT_JOYSTICK_AXES:
 636     return __glutNumJoystickAxes;
 637   default:
 638     __glutWarning("invalid glutDeviceGet parameter: %d", param);
 639     return -1;
 640   }
 641 }
 642 /* ENDCENTRY */