src/libgame/joystick.c

   1 // ============================================================================
   2 // Artsoft Retro-Game Library
   3 // ----------------------------------------------------------------------------
   4 // (c) 1995-2014 by Artsoft Entertainment
   5 //                  Holger Schemel
   6 //                  info@artsoft.org
   7 //                  https://www.artsoft.org/
   8 // ----------------------------------------------------------------------------
   9 // joystick.c
  10 // ============================================================================
  11
  12 #if defined(PLATFORM_FREEBSD)
  13 #include <machine/joystick.h>
  14 #endif
  15
  16 #include "joystick.h"
  17 #include "misc.h"
  18
  19
  20 // ============================================================================
  21 // platform independent joystick functions
  22 // ============================================================================
  23
  24 int getJoystickNrFromDeviceName(char *device_name)
  25 {
  26   char c;
  27   int joystick_nr = 0;
  28
  29   if (device_name == NULL || device_name[0] == '\0')
  30     return 0;
  31
  32   c = device_name[strlen(device_name) - 1];
  33
  34   if (c >= '0' && c <= '9')
  35     joystick_nr = (int)(c - '0');
  36
  37   if (joystick_nr < 0 || joystick_nr >= MAX_PLAYERS)
  38     joystick_nr = 0;
  39
  40   return joystick_nr;
  41 }
  42
  43 char *getDeviceNameFromJoystickNr(int joystick_nr)
  44 {
  45   static char *joystick_device_name[MAX_PLAYERS] =
  46   {
  47     DEV_JOYSTICK_0,
  48     DEV_JOYSTICK_1,
  49     DEV_JOYSTICK_2,
  50     DEV_JOYSTICK_3
  51   };
  52
  53   return (joystick_nr >= 0 && joystick_nr <= 3 ?
  54           joystick_device_name[joystick_nr] : "");
  55 }
  56
  57 char *getFormattedJoystickName(const char *name_raw)
  58 {
  59   static char name[MAX_JOYSTICK_NAME_LEN + 1];
  60   boolean name_skip_space = TRUE;
  61   int i, j;
  62
  63   if (name_raw == NULL)
  64     name_raw = "(unknown joystick)";
  65
  66   // copy joystick name, cutting leading and multiple spaces
  67   for (i = 0, j = 0; i < strlen(name_raw) && i < MAX_JOYSTICK_NAME_LEN; i++)
  68   {
  69     if (name_raw[i] != ' ')
  70     {
  71       name[j++] = name_raw[i];
  72       name_skip_space = FALSE;
  73     }
  74     else if (!name_skip_space)
  75     {
  76       name[j++] = name_raw[i];
  77       name_skip_space = TRUE;
  78     }
  79   }
  80
  81   // cut trailing space
  82   if (j > 0 && name[j - 1] == ' ')
  83     j--;
  84
  85   name[j] = '\0';
  86
  87   return name;
  88 }
  89
  90 static int JoystickPositionPercent(int center, int border, int actual)
  91 {
  92   int range, position;
  93   int percent;
  94
  95   if (border < center && actual > center)
  96     return 0;
  97   if (border > center && actual < center)
  98     return 0;
  99
 100   range = ABS(border - center);
 101   position = ABS(actual - center);
 102
 103   percent = (int)(position * 100 / range);
 104
 105   if (percent > 100)
 106     percent = 100;
 107
 108   return percent;
 109 }
 110
 111 int JoystickExt(int player_nr, boolean use_as_joystick_nr)
 112 {
 113   int joystick_nr = joystick.nr[player_nr];
 114   int js_x, js_y;
 115   boolean js_b1, js_b2;
 116   int left, right, up, down;
 117   int result = JOY_NO_ACTION;
 118
 119   if (use_as_joystick_nr)
 120     joystick_nr = player_nr;
 121
 122   if (joystick.status != JOYSTICK_ACTIVATED)
 123     return JOY_NO_ACTION;
 124
 125   if (joystick_nr < 0)
 126     return JOY_NO_ACTION;
 127
 128   if (!ReadJoystick(joystick_nr, &js_x, &js_y, &js_b1, &js_b2))
 129   {
 130     Warn("cannot read joystick device '%s'",
 131          setup.input[player_nr].joy.device_name);
 132
 133     joystick.status = JOYSTICK_NOT_AVAILABLE;
 134
 135     return JOY_NO_ACTION;
 136   }
 137
 138   left  = JoystickPositionPercent(setup.input[player_nr].joy.xmiddle,
 139                                   setup.input[player_nr].joy.xleft,  js_x);
 140   right = JoystickPositionPercent(setup.input[player_nr].joy.xmiddle,
 141                                   setup.input[player_nr].joy.xright, js_x);
 142   up    = JoystickPositionPercent(setup.input[player_nr].joy.ymiddle,
 143                                   setup.input[player_nr].joy.yupper, js_y);
 144   down  = JoystickPositionPercent(setup.input[player_nr].joy.ymiddle,
 145                                   setup.input[player_nr].joy.ylower, js_y);
 146
 147   if (left > JOYSTICK_PERCENT)
 148     result |= JOY_LEFT;
 149   else if (right > JOYSTICK_PERCENT)
 150     result |= JOY_RIGHT;
 151   if (up > JOYSTICK_PERCENT)
 152     result |= JOY_UP;
 153   else if (down > JOYSTICK_PERCENT)
 154     result |= JOY_DOWN;
 155
 156   if (js_b1)
 157     result |= JOY_BUTTON_1;
 158   if (js_b2)
 159     result |= JOY_BUTTON_2;
 160
 161   return result;
 162 }
 163
 164 int Joystick(int player_nr)
 165 {
 166   return JoystickExt(player_nr, FALSE);
 167 }
 168
 169 static int JoystickButtonExt(int player_nr, boolean use_as_joystick_nr)
 170 {
 171   static int last_joy_button[MAX_PLAYERS] = { 0, 0, 0, 0 };
 172   int joy_button = (JoystickExt(player_nr, use_as_joystick_nr) & JOY_BUTTON);
 173   int result;
 174
 175   if (joy_button)
 176   {
 177     if (last_joy_button[player_nr])
 178       result = JOY_BUTTON_PRESSED;
 179     else
 180       result = JOY_BUTTON_NEW_PRESSED;
 181   }
 182   else
 183   {
 184     if (last_joy_button[player_nr])
 185       result = JOY_BUTTON_NEW_RELEASED;
 186     else
 187       result = JOY_BUTTON_NOT_PRESSED;
 188   }
 189
 190   last_joy_button[player_nr] = joy_button;
 191   return result;
 192 }
 193
 194 int JoystickButton(int player_nr)
 195 {
 196   return JoystickButtonExt(player_nr, FALSE);
 197 }
 198
 199 int AnyJoystick(void)
 200 {
 201   int i;
 202   int result = 0;
 203
 204   for (i = 0; i < MAX_PLAYERS; i++)
 205     result |= JoystickExt(i, TRUE);
 206
 207   return result;
 208 }
 209
 210 int AnyJoystickButton(void)
 211 {
 212   int i;
 213   int result = JOY_BUTTON_NOT_PRESSED;
 214
 215   for (i = 0; i < MAX_PLAYERS; i++)
 216   {
 217     result = JoystickButtonExt(i, TRUE);
 218     if (result != JOY_BUTTON_NOT_PRESSED)
 219       break;
 220   }
 221
 222   return result;
 223 }