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                             *
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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 /*
  22 #include "tools.h"
  23 #include "game.h"
  24 #include "events.h"
  25 #include "sound.h"
  26 #include "misc.h"
  27 #include "buttons.h"
  28 #include <math.h>
  29 */
  30
  31 void CheckJoystickData()
  32 {
  33   int i;
  34   int distance = 100;
  35
  36   for(i=0;i<2;i++)
  37   {
  38     if (joystick[i].xmiddle <= distance)
  39       joystick[i].xmiddle = distance;
  40     if (joystick[i].ymiddle <= distance)
  41       joystick[i].ymiddle = distance;
  42
  43     if (joystick[i].xleft >= joystick[i].xmiddle)
  44       joystick[i].xleft = joystick[i].xmiddle-distance;
  45     if (joystick[i].xright <= joystick[i].xmiddle)
  46       joystick[i].xright = joystick[i].xmiddle+distance;
  47
  48     if (joystick[i].yupper >= joystick[i].ymiddle)
  49       joystick[i].yupper = joystick[i].ymiddle-distance;
  50     if (joystick[i].ylower <= joystick[i].ymiddle)
  51       joystick[i].ylower = joystick[i].ymiddle+distance;
  52   }
  53 }
  54
  55 int JoystickPosition(int middle, int margin, int actual)
  56 {
  57   long range, pos;
  58   int percentage;
  59
  60   if (margin<middle && actual>middle)
  61     return(0);
  62   if (margin>middle && actual<middle)
  63     return(0);
  64
  65   range = ABS(margin-middle);
  66   pos = ABS(actual-middle);
  67   percentage = (int)(pos*100/range);
  68   if (percentage>100)
  69     percentage = 100;
  70
  71   return(percentage);
  72 }
  73
  74 int Joystick()
  75 {
  76 #ifdef __FreeBSD__
  77   struct joystick joy_ctrl;
  78 #else
  79   struct joystick_control
  80   {
  81     int buttons;
  82     int x;
  83     int y;
  84   } joy_ctrl;
  85 #endif
  86
  87   int js_x,js_y, js_b1,js_b2;
  88   int left, right, up, down;
  89   int result=0;
  90
  91   if (joystick_status==JOYSTICK_OFF)
  92     return(0);
  93
  94 #ifndef MSDOS
  95   if (read(joystick_device, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
  96   {
  97     Error(ERR_RETURN, "cannot read joystick settings - no joystick support");
  98     joystick_status = JOYSTICK_OFF;
  99     return(0);
 100   }
 101
 102   js_x  = joy_ctrl.x;
 103   js_y  = joy_ctrl.y;
 104 #ifdef __FreeBSD__
 105   js_b1 = joy_ctrl.b1;
 106   js_b2 = joy_ctrl.b2;
 107 #else
 108   js_b1 = joy_ctrl.buttons & 1;
 109   js_b2 = joy_ctrl.buttons & 2;
 110 #endif
 111
 112   left = JoystickPosition(joystick[joystick_nr].xmiddle,
 113                           joystick[joystick_nr].xleft,  js_x);
 114   right = JoystickPosition(joystick[joystick_nr].xmiddle,
 115                            joystick[joystick_nr].xright, js_x);
 116   up =    JoystickPosition(joystick[joystick_nr].ymiddle,
 117                            joystick[joystick_nr].yupper, js_y);
 118   down =  JoystickPosition(joystick[joystick_nr].ymiddle,
 119                            joystick[joystick_nr].ylower, js_y);
 120
 121   if (left>JOYSTICK_PERCENT)
 122     result |= JOY_LEFT;
 123   else if (right>JOYSTICK_PERCENT)
 124     result |= JOY_RIGHT;
 125   if (up>JOYSTICK_PERCENT)
 126     result |= JOY_UP;
 127   else if (down>JOYSTICK_PERCENT)
 128     result |= JOY_DOWN;
 129   if (js_b1)
 130     result |= JOY_BUTTON_1;
 131   if (js_b2)
 132     result |= JOY_BUTTON_2;
 133
 134   return(result);
 135 #else
 136   return(0);
 137 #endif
 138 }
 139
 140 int JoystickButton()
 141 {
 142   static int last_joy_button = 0;
 143   int joy_button = (Joystick() & JOY_BUTTON);
 144   int result;
 145
 146   if (joy_button)
 147   {
 148     if (last_joy_button)
 149       result = JOY_BUTTON_PRESSED;
 150     else
 151       result = JOY_BUTTON_NEW_PRESSED;
 152   }
 153   else
 154   {
 155     if (last_joy_button)
 156       result = JOY_BUTTON_NEW_RELEASED;
 157     else
 158       result = JOY_BUTTON_NOT_PRESSED;
 159   }
 160
 161   last_joy_button = joy_button;
 162   return(result);
 163 }