arch/sdl/joy.c

   1 /*
   2  * $Source: /cvs/cvsroot/d2x/arch/sdl/joy.c,v $
   3  * $Revision: 1.4 $
   4  * $Author: bradleyb $
   5  * $Date: 2002-03-23 09:13:00 $
   6  *
   7  * SDL joystick support
   8  *
   9  * $Log: not supported by cvs2svn $
  10  * Revision 1.3  2002/03/05 12:13:33  bradleyb
  11  * SDL joystick stuff mostly done
  12  *
  13  * Revision 1.2  2001/12/03 02:43:02  bradleyb
  14  * lots of makefile fixes, and sdl joystick stuff
  15  *
  16  * Revision 1.1  2001/10/24 09:25:05  bradleyb
  17  * Moved input stuff to arch subdirs, as in d1x.
  18  *
  19  * Revision 1.1  2001/10/10 03:01:29  bradleyb
  20  * Replacing win32 joystick (broken) with SDL joystick (stubs)
  21  *
  22  *
  23  */
  24
  25 #define JOYSTICK_DEBUG
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include <conf.h>
  29 #endif
  30
  31 #include <SDL/SDL.h>
  32
  33 #include "joy.h"
  34 #include "error.h"
  35 #include "timer.h"
  36 #include "console.h"
  37 #include "event.h"
  38
  39 #define MAX_JOYSTICKS 16
  40 #define MAX_AXES 32
  41
  42 #define MAX_AXES_PER_JOYSTICK 8
  43 #define MAX_BUTTONS_PER_JOYSTICK 16
  44
  45 char joy_present = 0;
  46 int num_joysticks = 0;
  47
  48 int joy_deadzone = 0;
  49
  50 struct joybutton {
  51         int state;
  52         fix time_went_down;
  53         int num_downs;
  54         int num_ups;
  55 };
  56
  57 struct joyaxis {
  58         int             value;
  59         int             min_val;
  60         int             center_val;
  61         int             max_val;
  62 };
  63
  64 static struct joyinfo {
  65         int n_axes;
  66         int n_buttons;
  67         struct joyaxis axes[MAX_AXES];
  68         struct joybutton buttons[MAX_BUTTONS];
  69 } Joystick;
  70
  71 static struct {
  72         SDL_Joystick *handle;
  73         int n_axes;
  74         int n_buttons;
  75         int axis_map[MAX_AXES_PER_JOYSTICK];
  76         int button_map[MAX_BUTTONS_PER_JOYSTICK];
  77 } SDL_Joysticks[MAX_JOYSTICKS];
  78
  79 void joy_button_handler(SDL_JoyButtonEvent *jbe)
  80 {
  81         int button;
  82
  83         button = SDL_Joysticks[jbe->which].button_map[jbe->button];
  84
  85         Joystick.buttons[button].state = jbe->state;
  86
  87         switch (jbe->type) {
  88         case SDL_JOYBUTTONDOWN:
  89                 Joystick.buttons[button].time_went_down
  90                         = timer_get_fixed_seconds();
  91                 Joystick.buttons[button].num_downs++;
  92                 break;
  93         case SDL_JOYBUTTONUP:
  94                 Joystick.buttons[button].num_ups++;
  95                 break;
  96         }
  97 }
  98
  99 void joy_axis_handler(SDL_JoyAxisEvent *jae)
 100 {
 101         int axis;
 102
 103         axis = SDL_Joysticks[jae->which].axis_map[jae->axis];
 104
 105         Joystick.axes[axis].value = jae->value;
 106 }
 107
 108
 109 /* ----------------------------------------------- */
 110
 111 int joy_init()
 112 {
 113         int i,j,n;
 114
 115         memset(&Joystick,0,sizeof(Joystick));
 116
 117         n = SDL_NumJoysticks();
 118
 119         con_printf(CON_VERBOSE, "sdl-joystick: found %d joysticks\n", n);
 120         for (i = 0; i < n; i++) {
 121                 con_printf(CON_VERBOSE, "sdl-joystick %d: %s\n", i, SDL_JoystickName(i));
 122                 SDL_Joysticks[num_joysticks].handle = SDL_JoystickOpen(i);
 123                 if (SDL_Joysticks[num_joysticks].handle) {
 124                         joy_present = 1;
 125                         SDL_Joysticks[num_joysticks].n_axes
 126                                 = SDL_JoystickNumAxes(SDL_Joysticks[num_joysticks].handle);
 127                         SDL_Joysticks[num_joysticks].n_buttons
 128                                 = SDL_JoystickNumButtons(SDL_Joysticks[num_joysticks].handle);
 129                         con_printf(CON_VERBOSE, "sdl-joystick: %d axes\n", SDL_Joysticks[num_joysticks].n_axes);
 130                         con_printf(CON_VERBOSE, "sdl-joystick: %d buttons\n", SDL_Joysticks[num_joysticks].n_buttons);
 131                         for (j=0; j < SDL_Joysticks[num_joysticks].n_axes; j++)
 132                                 SDL_Joysticks[num_joysticks].axis_map[j] = Joystick.n_axes++;
 133                         for (j=0; j < SDL_Joysticks[num_joysticks].n_buttons; j++)
 134                                 SDL_Joysticks[num_joysticks].button_map[j] = Joystick.n_buttons++;
 135                         num_joysticks++;
 136                 } else
 137                         con_printf(CON_VERBOSE, "sdl-joystick: initialization failed!\n");
 138                 con_printf(CON_VERBOSE, "sdl-joystick: %d axes (total)\n", Joystick.n_axes);
 139                 con_printf(CON_VERBOSE, "sdl-joystick: %d buttons (total)\n", Joystick.n_buttons);
 140         }
 141
 142         return joy_present;
 143 }
 144
 145 void joy_close()
 146 {
 147         while (num_joysticks)
 148                 SDL_JoystickClose(SDL_Joysticks[--num_joysticks].handle);
 149 }
 150
 151 void joy_get_pos(int *x, int *y)
 152 {
 153         int axis[MAX_AXES];
 154
 155         if (!num_joysticks) {
 156                 *x=*y=0;
 157                 return;
 158         }
 159
 160         joystick_read_raw_axis (JOY_ALL_AXIS, axis);
 161
 162         *x = joy_get_scaled_reading( axis[0], 0 );
 163         *y = joy_get_scaled_reading( axis[1], 1 );
 164 }
 165
 166 int joy_get_btns()
 167 {
 168 #if 0 // This is never used?
 169         int i, buttons = 0;
 170         for (i=0; i++; i<buttons) {
 171                 switch (Joystick.buttons[i].state) {
 172                 case SDL_PRESSED:
 173                         buttons |= 1<<i;
 174                         break;
 175                 case SDL_RELEASED:
 176                         break;
 177                 }
 178         }
 179         return buttons;
 180 #else
 181         return 0;
 182 #endif
 183 }
 184
 185 int joy_get_button_down_cnt( int btn )
 186 {
 187         int num_downs;
 188
 189         if (!num_joysticks)
 190                 return 0;
 191
 192         event_poll();
 193
 194         num_downs = Joystick.buttons[btn].num_downs;
 195         Joystick.buttons[btn].num_downs = 0;
 196
 197         return num_downs;
 198 }
 199
 200 fix joy_get_button_down_time(int btn)
 201 {
 202         fix time;
 203
 204         if (!num_joysticks)
 205                 return 0;
 206
 207         event_poll();
 208
 209         switch (Joystick.buttons[btn].state) {
 210         case SDL_PRESSED:
 211                 time = timer_get_fixed_seconds() - Joystick.buttons[btn].time_went_down;
 212                 Joystick.buttons[btn].time_went_down = timer_get_fixed_seconds();
 213                 break;
 214         case SDL_RELEASED:
 215                 time = 0;
 216                 break;
 217         }
 218
 219         return time;
 220 }
 221
 222 ubyte joystick_read_raw_axis( ubyte mask, int * axis )
 223 {
 224         int i;
 225
 226         if (!num_joysticks)
 227                 return 0;
 228
 229         event_poll();
 230
 231         for (i = 0; i <= JOY_NUM_AXES; i++) {
 232                 axis[i] = Joystick.axes[i].value;
 233         }
 234
 235         return 0;
 236 }
 237
 238 void joy_flush()
 239 {
 240         int i;
 241
 242         if (!num_joysticks)
 243                 return;
 244
 245         for (i = 0; i < Joystick.n_buttons; i++) {
 246                 Joystick.buttons[i].time_went_down = 0;
 247                 Joystick.buttons[i].num_downs = 0;
 248         }
 249
 250 }
 251
 252 int joy_get_button_state( int btn )
 253 {
 254         if (!num_joysticks)
 255                 return 0;
 256
 257         if(btn >= Joystick.n_buttons)
 258                 return 0;
 259
 260         event_poll();
 261
 262         return Joystick.buttons[btn].state;
 263 }
 264
 265 void joy_get_cal_vals(int *axis_min, int *axis_center, int *axis_max)
 266 {
 267         int i;
 268
 269         for (i = 0; i < JOY_NUM_AXES; i++) {
 270                 axis_center[i] = Joystick.axes[i].center_val;
 271                 axis_min[i] = Joystick.axes[i].min_val;
 272                 axis_max[i] = Joystick.axes[i].max_val;
 273         }
 274 }
 275
 276 void joy_set_cal_vals(int *axis_min, int *axis_center, int *axis_max)
 277 {
 278         int i;
 279
 280         for (i = 0; i < JOY_NUM_AXES; i++) {
 281                 Joystick.axes[i].center_val = axis_center[i];
 282                 Joystick.axes[i].min_val = axis_min[i];
 283                 Joystick.axes[i].max_val = axis_max[i];
 284         }
 285 }
 286
 287 int joy_get_scaled_reading( int raw, int axis_num )
 288 {
 289 #if 1
 290         return raw/256;
 291 #else
 292         int d, x;
 293
 294         raw -= Joystick.axes[axis_num].center_val;
 295
 296         if (raw < 0)
 297                 d = Joystick.axes[axis_num].center_val - Joystick.axes[axis_num].min_val;
 298         else if (raw > 0)
 299                 d = Joystick.axes[axis_num].max_val - Joystick.axes[axis_num].center_val;
 300         else
 301                 d = 0;
 302
 303         if (d)
 304                 x = ((raw << 7) / d);
 305         else
 306                 x = 0;
 307
 308         if ( x < -128 )
 309                 x = -128;
 310         if ( x > 127 )
 311                 x = 127;
 312
 313         d =  (joy_deadzone) * 6;
 314         if ((x > (-1*d)) && (x < d))
 315                 x = 0;
 316
 317         return x;
 318 #endif
 319 }
 320
 321 void joy_set_slow_reading( int flag )
 322 {
 323 }