joystick.c

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/*
 * See Licensing and Copyright notice in naev.h
 */
#include "SDL.h"
#include "SDL_haptic.h"
#include "SDL_joystick.h"
 
#include "naev.h"
#include "joystick.h"
 
#include "log.h"
#include "nstring.h"
 
static SDL_Joystick *joystick = NULL; 
static int has_haptic = 0; 
SDL_Haptic *haptic = NULL; 
unsigned int haptic_query = 0; 
/*
 * Prototypes.
 */
static void joystick_initHaptic (void);
 
int joystick_get( const char* namjoystick )
{
   for (int i=0; i < SDL_NumJoysticks(); i++) {
      const char *jname = SDL_JoystickNameForIndex(i);
      if (strstr( jname, namjoystick ))
         return i;
   }
 
   WARN(_("Joystick '%s' not found, using default joystick '%s'"),
         namjoystick, SDL_JoystickName(0));
   return 0;
}
 
int joystick_use( int indjoystick )
{
   const char *jname;
 
   /* Check to see if it exists. */
   if ((indjoystick < 0) || (indjoystick >= SDL_NumJoysticks())) {
      WARN(_("Joystick of index number %d does not exist, switching to default 0"),
            indjoystick);
      indjoystick = 0;
   }
 
   /* Close if already open. */
   if (joystick != NULL) {
      SDL_JoystickClose(joystick);
      joystick = NULL;
   }
 
   /* Start using joystick. */
   joystick = SDL_JoystickOpen(indjoystick);
   jname = SDL_JoystickNameForIndex(indjoystick);
   if (joystick == NULL) {
      WARN(_("Error opening joystick %d [%s]"), indjoystick, jname);
      return -1;
   }
   LOG(_("Using joystick %d - %s"), indjoystick, jname);
   DEBUG(_("   with %d axes, %d buttons, %d balls and %d hats"),
         SDL_JoystickNumAxes(joystick), SDL_JoystickNumButtons(joystick),
         SDL_JoystickNumBalls(joystick), SDL_JoystickNumHats(joystick));
 
   /* Initialize the haptic if possible. */
   joystick_initHaptic();
 
   /* For style purposes. */
   DEBUG_BLANK();
 
   return 0;
}
 
static void joystick_initHaptic (void)
{
   if (!has_haptic || !SDL_JoystickIsHaptic(joystick))
      return;
 
   /* Close haptic if already open. */
   if (haptic != NULL) {
      SDL_HapticClose(haptic);
      haptic = NULL;
   }
 
   /* Try to create haptic device. */
   haptic = SDL_HapticOpenFromJoystick(joystick);
   if (haptic == NULL) {
      WARN(_("Unable to initialize force feedback: %s"), SDL_GetError());
      return;
   }
 
   /* Check to see what it supports. */
   haptic_query = SDL_HapticQuery(haptic);
   if (!(haptic_query & SDL_HAPTIC_SINE)) {
      SDL_HapticClose(haptic);
      haptic = NULL;
      return;
   }
 
   DEBUG(_("   force feedback enabled"));
}
 
#if DEBUGGING
static void joystick_debug (void)
{
   /* figure out how many joysticks there are */
   int numjoysticks = SDL_NumJoysticks();
   DEBUG( n_("%d joystick detected", "%d joysticks detected", numjoysticks), numjoysticks );
   for (int i=0; i < numjoysticks; i++) {
      const char *jname = SDL_JoystickNameForIndex(i);
      DEBUG("  %d. %s", i, jname);
   }
}
#endif /* DEBUGGING */
 
int joystick_init (void)
{
   /* initialize the sdl subsystem */
   if (SDL_InitSubSystem(SDL_INIT_JOYSTICK)) {
      WARN(_("Unable to initialize the joystick subsystem"));
      return -1;
   }
 
   if (SDL_InitSubSystem(SDL_INIT_HAPTIC) == 0)
      has_haptic = 1;
 
#if DEBUGGING
   joystick_debug();
#endif /* DEBUGGING */
 
   /* enables joystick events */
   SDL_JoystickEventState(SDL_ENABLE);
 
   return 0;
}
 
void joystick_exit (void)
{
   if (haptic != NULL) {
      SDL_HapticClose(haptic);
      haptic = NULL;
   }
 
   if (joystick != NULL) {
      SDL_JoystickClose(joystick);
      joystick = NULL;
   }
}