src/joystick.c

   1 /***********************************************************
   2 *  Rocks'n'Diamonds -- McDuffin Strikes Back!              *
   3 *----------------------------------------------------------*
   4 *  (c) 1995-98 Artsoft Entertainment                       *
   5 *              Holger Schemel                              *
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   7 *              33604 Bielefeld                             *
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   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<2;i++)
  27   {
  28     if (joystick[i].xmiddle <= distance)
  29       joystick[i].xmiddle = distance;
  30     if (joystick[i].ymiddle <= distance)
  31       joystick[i].ymiddle = distance;
  32
  33     if (joystick[i].xleft >= joystick[i].xmiddle)
  34       joystick[i].xleft = joystick[i].xmiddle-distance;
  35     if (joystick[i].xright <= joystick[i].xmiddle)
  36       joystick[i].xright = joystick[i].xmiddle+distance;
  37
  38     if (joystick[i].yupper >= joystick[i].ymiddle)
  39       joystick[i].yupper = joystick[i].ymiddle-distance;
  40     if (joystick[i].ylower <= joystick[i].ymiddle)
  41       joystick[i].ylower = joystick[i].ymiddle+distance;
  42   }
  43 }
  44
  45 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   if (percentage>100)
  59     percentage = 100;
  60
  61   return(percentage);
  62 }
  63
  64 int Joystick()
  65 {
  66 #ifdef __FreeBSD__
  67   struct joystick joy_ctrl;
  68 #else
  69   struct joystick_control
  70   {
  71     int buttons;
  72     int x;
  73     int y;
  74   } joy_ctrl;
  75 #endif
  76
  77   int js_x,js_y, js_b1,js_b2;
  78   int left, right, up, down;
  79   int result=0;
  80
  81   if (joystick_status==JOYSTICK_OFF)
  82     return(0);
  83
  84 #ifndef MSDOS
  85   if (read(joystick_device, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
  86   {
  87     Error(ERR_RETURN, "cannot read joystick settings - no joystick support");
  88     joystick_status = JOYSTICK_OFF;
  89     return(0);
  90   }
  91
  92   js_x  = joy_ctrl.x;
  93   js_y  = joy_ctrl.y;
  94 #ifdef __FreeBSD__
  95   js_b1 = joy_ctrl.b1;
  96   js_b2 = joy_ctrl.b2;
  97 #else
  98   js_b1 = joy_ctrl.buttons & 1;
  99   js_b2 = joy_ctrl.buttons & 2;
 100 #endif
 101
 102   left = JoystickPosition(joystick[setup.joystick_nr].xmiddle,
 103                           joystick[setup.joystick_nr].xleft,  js_x);
 104   right = JoystickPosition(joystick[setup.joystick_nr].xmiddle,
 105                            joystick[setup.joystick_nr].xright, js_x);
 106   up =    JoystickPosition(joystick[setup.joystick_nr].ymiddle,
 107                            joystick[setup.joystick_nr].yupper, js_y);
 108   down =  JoystickPosition(joystick[setup.joystick_nr].ymiddle,
 109                            joystick[setup.joystick_nr].ylower, js_y);
 110
 111   if (left>JOYSTICK_PERCENT)
 112     result |= JOY_LEFT;
 113   else if (right>JOYSTICK_PERCENT)
 114     result |= JOY_RIGHT;
 115   if (up>JOYSTICK_PERCENT)
 116     result |= JOY_UP;
 117   else if (down>JOYSTICK_PERCENT)
 118     result |= JOY_DOWN;
 119   if (js_b1)
 120     result |= JOY_BUTTON_1;
 121   if (js_b2)
 122     result |= JOY_BUTTON_2;
 123
 124   return(result);
 125 #else
 126   return(0);
 127 #endif
 128 }
 129
 130 int JoystickButton()
 131 {
 132   static int last_joy_button = 0;
 133   int joy_button = (Joystick() & JOY_BUTTON);
 134   int result;
 135
 136   if (joy_button)
 137   {
 138     if (last_joy_button)
 139       result = JOY_BUTTON_PRESSED;
 140     else
 141       result = JOY_BUTTON_NEW_PRESSED;
 142   }
 143   else
 144   {
 145     if (last_joy_button)
 146       result = JOY_BUTTON_NEW_RELEASED;
 147     else
 148       result = JOY_BUTTON_NOT_PRESSED;
 149   }
 150
 151   last_joy_button = joy_button;
 152   return(result);
 153 }