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 static int JoystickPosition(int middle, int margin, int actual)
  46 {
  47   long range, pos;
  48   int percentage;
  49
  50   if (margin < middle && actual > middle)
  51     return 0;
  52   if (margin > middle && actual < middle)
  53     return 0;
  54
  55   range = ABS(margin - middle);
  56   pos = ABS(actual - middle);
  57   percentage = (int)(pos * 100 / range);
  58
  59   if (percentage > 100)
  60     percentage = 100;
  61
  62   return percentage;
  63 }
  64
  65 int Joystick(int player_nr)
  66 {
  67 #ifdef __FreeBSD__
  68   struct joystick joy_ctrl;
  69 #else
  70   struct joystick_control
  71   {
  72     int buttons;
  73     int x;
  74     int y;
  75   } joy_ctrl;
  76 #endif
  77
  78   int joystick_fd = stored_player[player_nr].joystick_fd;
  79   int js_x,js_y, js_b1,js_b2;
  80   int left, right, up, down;
  81   int result = 0;
  82
  83   if (joystick_status == JOYSTICK_OFF)
  84     return 0;
  85
  86   if (!setup.input[player_nr].use_joystick || joystick_fd < 0)
  87     return 0;
  88
  89 #ifndef MSDOS
  90   if (read(joystick_fd, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
  91   {
  92     Error(ERR_WARN, "cannot read joystick device '%s'",
  93           setup.input[player_nr].joy.device_name);
  94     joystick_status = JOYSTICK_OFF;
  95     return 0;
  96   }
  97
  98   js_x  = joy_ctrl.x;
  99   js_y  = joy_ctrl.y;
 100
 101 #ifdef __FreeBSD__
 102   js_b1 = joy_ctrl.b1;
 103   js_b2 = joy_ctrl.b2;
 104 #else
 105   js_b1 = joy_ctrl.buttons & 1;
 106   js_b2 = joy_ctrl.buttons & 2;
 107 #endif
 108
 109   left  = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 110                            setup.input[player_nr].joy.xleft,  js_x);
 111   right = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 112                            setup.input[player_nr].joy.xright, js_x);
 113   up    = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 114                            setup.input[player_nr].joy.yupper, js_y);
 115   down  = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 116                            setup.input[player_nr].joy.ylower, js_y);
 117
 118   if (left > JOYSTICK_PERCENT)
 119     result |= JOY_LEFT;
 120   else if (right > JOYSTICK_PERCENT)
 121     result |= JOY_RIGHT;
 122   if (up > JOYSTICK_PERCENT)
 123     result |= JOY_UP;
 124   else if (down > JOYSTICK_PERCENT)
 125     result |= JOY_DOWN;
 126
 127   if (js_b1)
 128     result |= JOY_BUTTON_1;
 129   if (js_b2)
 130     result |= JOY_BUTTON_2;
 131
 132   return result;
 133 #else
 134   return 0;
 135 #endif
 136 }
 137
 138 int JoystickButton(int player_nr)
 139 {
 140   static int last_joy_button = 0;
 141   int joy_button = (Joystick(player_nr) & JOY_BUTTON);
 142   int result;
 143
 144   if (joy_button)
 145   {
 146     if (last_joy_button)
 147       result = JOY_BUTTON_PRESSED;
 148     else
 149       result = JOY_BUTTON_NEW_PRESSED;
 150   }
 151   else
 152   {
 153     if (last_joy_button)
 154       result = JOY_BUTTON_NEW_RELEASED;
 155     else
 156       result = JOY_BUTTON_NOT_PRESSED;
 157   }
 158
 159   last_joy_button = joy_button;
 160   return result;
 161 }
 162
 163 int AnyJoystick()
 164 {
 165   int i;
 166   int result = 0;
 167
 168   for (i=0; i<MAX_PLAYERS; i++)
 169   {
 170     if (!setup.input[i].use_joystick)
 171       continue;
 172
 173     result |= Joystick(i);
 174   }
 175
 176   return result;
 177 }
 178
 179 int AnyJoystickButton()
 180 {
 181   int i;
 182   int result = 0;
 183
 184   for (i=0; i<MAX_PLAYERS; i++)
 185   {
 186     if (!setup.input[i].use_joystick)
 187       continue;
 188
 189     result |= JoystickButton(i);
 190   }
 191
 192   return result;
 193 }