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 "joystick.h"
 
#include "log.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;
   }
}