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 int Joystick(int player_nr)
  68 {
  69 #ifndef MSDOS
  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 #endif
  81
  82   int joystick_fd = stored_player[player_nr].joystick_fd;
  83
  84 #ifndef MSDOS
  85   int js_x,js_y, js_b1,js_b2;
  86   int left, right, up, down;
  87   int result = 0;
  88 #endif
  89
  90   if (joystick_status == JOYSTICK_OFF)
  91     return 0;
  92
  93   if (!setup.input[player_nr].use_joystick || joystick_fd < 0)
  94     return 0;
  95
  96 #ifndef MSDOS
  97   if (read(joystick_fd, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
  98   {
  99     Error(ERR_WARN, "cannot read joystick device '%s'",
 100           setup.input[player_nr].joy.device_name);
 101     joystick_status = JOYSTICK_OFF;
 102     return 0;
 103   }
 104
 105   js_x  = joy_ctrl.x;
 106   js_y  = joy_ctrl.y;
 107
 108 #ifdef __FreeBSD__
 109   js_b1 = joy_ctrl.b1;
 110   js_b2 = joy_ctrl.b2;
 111 #else
 112   js_b1 = joy_ctrl.buttons & 1;
 113   js_b2 = joy_ctrl.buttons & 2;
 114 #endif
 115
 116   left  = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 117                            setup.input[player_nr].joy.xleft,  js_x);
 118   right = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 119                            setup.input[player_nr].joy.xright, js_x);
 120   up    = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 121                            setup.input[player_nr].joy.yupper, js_y);
 122   down  = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 123                            setup.input[player_nr].joy.ylower, js_y);
 124
 125   if (left > JOYSTICK_PERCENT)
 126     result |= JOY_LEFT;
 127   else if (right > JOYSTICK_PERCENT)
 128     result |= JOY_RIGHT;
 129   if (up > JOYSTICK_PERCENT)
 130     result |= JOY_UP;
 131   else if (down > JOYSTICK_PERCENT)
 132     result |= JOY_DOWN;
 133
 134   if (js_b1)
 135     result |= JOY_BUTTON_1;
 136   if (js_b2)
 137     result |= JOY_BUTTON_2;
 138
 139   return result;
 140 #else
 141   return 0;
 142 #endif
 143 }
 144
 145 int JoystickButton(int player_nr)
 146 {
 147   static int last_joy_button = 0;
 148   int joy_button = (Joystick(player_nr) & JOY_BUTTON);
 149   int result;
 150
 151   if (joy_button)
 152   {
 153     if (last_joy_button)
 154       result = JOY_BUTTON_PRESSED;
 155     else
 156       result = JOY_BUTTON_NEW_PRESSED;
 157   }
 158   else
 159   {
 160     if (last_joy_button)
 161       result = JOY_BUTTON_NEW_RELEASED;
 162     else
 163       result = JOY_BUTTON_NOT_PRESSED;
 164   }
 165
 166   last_joy_button = joy_button;
 167   return result;
 168 }
 169
 170 int AnyJoystick()
 171 {
 172   int i;
 173   int result = 0;
 174
 175   for (i=0; i<MAX_PLAYERS; i++)
 176   {
 177     if (!setup.input[i].use_joystick)
 178       continue;
 179
 180     result |= Joystick(i);
 181   }
 182
 183   return result;
 184 }
 185
 186 int AnyJoystickButton()
 187 {
 188   int i;
 189   int result = 0;
 190
 191   for (i=0; i<MAX_PLAYERS; i++)
 192   {
 193     if (!setup.input[i].use_joystick)
 194       continue;
 195
 196     result |= JoystickButton(i);
 197   }
 198
 199   return result;
 200 }