src/joystick.c

   1 /***********************************************************
   2 *  Rocks'n'Diamonds -- McDuffin Strikes Back!              *
   3 *----------------------------------------------------------*
   4 *  (c) 1995-98 Artsoft Entertainment                       *
   5 *              Holger Schemel                              *
   6 *              Oststrasse 11a                              *
   7 *              33604 Bielefeld                             *
   8 *              phone: ++49 +521 290471                     *
   9 *              email: aeglos@valinor.owl.de                *
  10 *----------------------------------------------------------*
  11 *  joystick.c                                              *
  12 ***********************************************************/
  13
  14 #ifdef __FreeBSD__
  15 #include <machine/joystick.h>
  16 #endif
  17
  18 #include "joystick.h"
  19 #include "misc.h"
  20
  21 void CheckJoystickData()
  22 {
  23   int i;
  24   int distance = 100;
  25
  26   for(i=0; i<MAX_PLAYERS; i++)
  27   {
  28     if (setup.input[i].joy.xmiddle <= distance)
  29       setup.input[i].joy.xmiddle = distance;
  30     if (setup.input[i].joy.ymiddle <= distance)
  31       setup.input[i].joy.ymiddle = distance;
  32
  33     if (setup.input[i].joy.xleft >= setup.input[i].joy.xmiddle)
  34       setup.input[i].joy.xleft = setup.input[i].joy.xmiddle - distance;
  35     if (setup.input[i].joy.xright <= setup.input[i].joy.xmiddle)
  36       setup.input[i].joy.xright = setup.input[i].joy.xmiddle + distance;
  37
  38     if (setup.input[i].joy.yupper >= setup.input[i].joy.ymiddle)
  39       setup.input[i].joy.yupper = setup.input[i].joy.ymiddle - distance;
  40     if (setup.input[i].joy.ylower <= setup.input[i].joy.ymiddle)
  41       setup.input[i].joy.ylower = setup.input[i].joy.ymiddle + distance;
  42   }
  43 }
  44
  45 #ifndef MSDOS
  46 static int JoystickPosition(int middle, int margin, int actual)
  47 {
  48   long range, pos;
  49   int percentage;
  50
  51   if (margin < middle && actual > middle)
  52     return 0;
  53   if (margin > middle && actual < middle)
  54     return 0;
  55
  56   range = ABS(margin - middle);
  57   pos = ABS(actual - middle);
  58   percentage = (int)(pos * 100 / range);
  59
  60   if (percentage > 100)
  61     percentage = 100;
  62
  63   return percentage;
  64 }
  65 #endif
  66
  67 #ifndef MSDOS
  68 int Joystick(int player_nr)
  69 {
  70 #ifdef __FreeBSD__
  71   struct joystick joy_ctrl;
  72 #else
  73   struct joystick_control
  74   {
  75     int buttons;
  76     int x;
  77     int y;
  78   } joy_ctrl;
  79 #endif
  80
  81   int joystick_fd = stored_player[player_nr].joystick_fd;
  82   int js_x,js_y, js_b1,js_b2;
  83   int left, right, up, down;
  84   int result = 0;
  85
  86   if (joystick_status == JOYSTICK_OFF)
  87     return 0;
  88
  89   if (game_status == SETUPINPUT)
  90     return 0;
  91
  92   if (joystick_fd < 0 || !setup.input[player_nr].use_joystick)
  93     return 0;
  94
  95   if (read(joystick_fd, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
  96   {
  97     Error(ERR_WARN, "cannot read joystick device '%s'",
  98           setup.input[player_nr].joy.device_name);
  99     joystick_status = JOYSTICK_OFF;
 100     return 0;
 101   }
 102
 103   js_x  = joy_ctrl.x;
 104   js_y  = joy_ctrl.y;
 105
 106 #ifdef __FreeBSD__
 107   js_b1 = joy_ctrl.b1;
 108   js_b2 = joy_ctrl.b2;
 109 #else
 110   js_b1 = joy_ctrl.buttons & 1;
 111   js_b2 = joy_ctrl.buttons & 2;
 112 #endif
 113
 114   left  = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 115                            setup.input[player_nr].joy.xleft,  js_x);
 116   right = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 117                            setup.input[player_nr].joy.xright, js_x);
 118   up    = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 119                            setup.input[player_nr].joy.yupper, js_y);
 120   down  = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 121                            setup.input[player_nr].joy.ylower, js_y);
 122
 123   if (left > JOYSTICK_PERCENT)
 124     result |= JOY_LEFT;
 125   else if (right > JOYSTICK_PERCENT)
 126     result |= JOY_RIGHT;
 127   if (up > JOYSTICK_PERCENT)
 128     result |= JOY_UP;
 129   else if (down > JOYSTICK_PERCENT)
 130     result |= JOY_DOWN;
 131
 132   if (js_b1)
 133     result |= JOY_BUTTON_1;
 134   if (js_b2)
 135     result |= JOY_BUTTON_2;
 136
 137   return result;
 138 }
 139
 140 #else /* MSDOS */
 141
 142 /* allegro global variables for joystick control */
 143 extern int num_joysticks;
 144 extern JOYSTICK_INFO joy[];
 145
 146 int Joystick(int player_nr)
 147 {
 148   int joystick_nr = stored_player[player_nr].joystick_fd;
 149   int result = 0;
 150
 151   if (joystick_status == JOYSTICK_OFF)
 152     return 0;
 153
 154   if (game_status == SETUPINPUT)
 155     return 0;
 156
 157   if (joystick_nr < 0)
 158     return 0;
 159
 160   /* the allegro global variable 'num_joysticks' contains the number
 161      of joysticks found at initialization under MSDOS / Windows */
 162
 163 #if 0
 164   if (joystick_nr >= num_joysticks || !setup.input[player_nr].use_joystick)
 165     return 0;
 166 #else
 167
 168 #if 1
 169   if (joystick_nr >= num_joysticks ||
 170       (game_status == PLAYING && !setup.input[player_nr].use_joystick))
 171     return 0;
 172 #else
 173   if (joystick_nr >= num_joysticks)
 174     return 0;
 175 #endif
 176
 177 #endif
 178
 179   poll_joystick();
 180
 181   if (joy[joystick_nr].stick[0].axis[0].d1)
 182     result |= JOY_LEFT;
 183   else if (joy[joystick_nr].stick[0].axis[0].d2)
 184     result |= JOY_RIGHT;
 185   if (joy[joystick_nr].stick[0].axis[1].d1)
 186     result |= JOY_UP;
 187   else if (joy[joystick_nr].stick[0].axis[1].d2)
 188     result |= JOY_DOWN;
 189
 190   if (joy[joystick_nr].button[0].b)
 191     result |= JOY_BUTTON_1;
 192   if (joy[joystick_nr].button[1].b)
 193     result |= JOY_BUTTON_2;
 194
 195   return result;
 196 }
 197 #endif /* MSDOS */
 198
 199 int JoystickButton(int player_nr)
 200 {
 201   static int last_joy_button[MAX_PLAYERS] = { 0, 0, 0, 0 };
 202   int joy_button = (Joystick(player_nr) & JOY_BUTTON);
 203   int result;
 204
 205   if (joy_button)
 206   {
 207     if (last_joy_button[player_nr])
 208       result = JOY_BUTTON_PRESSED;
 209     else
 210       result = JOY_BUTTON_NEW_PRESSED;
 211   }
 212   else
 213   {
 214     if (last_joy_button[player_nr])
 215       result = JOY_BUTTON_NEW_RELEASED;
 216     else
 217       result = JOY_BUTTON_NOT_PRESSED;
 218   }
 219
 220   last_joy_button[player_nr] = joy_button;
 221   return result;
 222 }
 223
 224 int AnyJoystick()
 225 {
 226   int i;
 227   int result = 0;
 228
 229   for (i=0; i<MAX_PLAYERS; i++)
 230   {
 231
 232     /*
 233     if (!setup.input[i].use_joystick)
 234       continue;
 235       */
 236
 237
 238     result |= Joystick(i);
 239   }
 240
 241   return result;
 242 }
 243
 244 int AnyJoystickButton()
 245 {
 246   int i;
 247   int result;
 248
 249   for (i=0; i<MAX_PLAYERS; i++)
 250   {
 251
 252     /*
 253     if (!setup.input[i].use_joystick)
 254       continue;
 255       */
 256
 257     /*
 258     result |= JoystickButton(i);
 259     */
 260
 261     result = JoystickButton(i);
 262     if (result != JOY_BUTTON_NOT_PRESSED)
 263       break;
 264   }
 265
 266   return result;
 267 }