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    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga

/* Include file for SDL joystick event handling */

import SDL_types;


/* In order to use these functions, SDL_Init() must have been called
   with the SDL_INIT_JOYSTICK flag.  This causes SDL to scan the system
   for joysticks, and load appropriate drivers.

/* The joystick structure used to identify an SDL joystick */
struct SDL_Joystick { }

/* Function prototypes */
 * Count the number of joysticks attached to the system
int SDL_NumJoysticks();

 * Get the implementation dependent name of a joystick.
 * This can be called before any joysticks are opened.
 * If no name can be found, this function returns NULL.
char *SDL_JoystickName(int device_index);

 * Open a joystick for use - the index passed as an argument refers to
 * the N'th joystick on the system.  This index is the value which will
 * identify this joystick in future joystick events.
 * This function returns a joystick identifier, or NULL if an error occurred.
SDL_Joystick *SDL_JoystickOpen(int device_index);

 * Returns 1 if the joystick has been opened, or 0 if it has not.
int SDL_JoystickOpened(int device_index);

 * Get the device index of an opened joystick.
int SDL_JoystickIndex(SDL_Joystick *joystick);

 * Get the number of general axis controls on a joystick
int SDL_JoystickNumAxes(SDL_Joystick *joystick);

 * Get the number of trackballs on a joystick
 * Joystick trackballs have only relative motion events associated
 * with them and their state cannot be polled.
int SDL_JoystickNumBalls(SDL_Joystick *joystick);

 * Get the number of POV hats on a joystick
int SDL_JoystickNumHats(SDL_Joystick *joystick);

 * Get the number of buttons on a joystick
int SDL_JoystickNumButtons(SDL_Joystick *joystick);

 * Update the current state of the open joysticks.
 * This is called automatically by the event loop if any joystick
 * events are enabled.
void SDL_JoystickUpdate();

 * Enable/disable joystick event polling.
 * If joystick events are disabled, you must call SDL_JoystickUpdate()
 * yourself and check the state of the joystick when you want joystick
 * information.
 * The state can be one of SDL_QUERY, SDL_ENABLE or SDL_IGNORE.
int SDL_JoystickEventState(int state);

 * Get the current state of an axis control on a joystick
 * The state is a value ranging from -32768 to 32767.
 * The axis indices start at index 0.
Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis);

 * Get the current state of a POV hat on a joystick
 * The return value is one of the following positions:
const uint SDL_HAT_CENTERED   = 0x00;
const uint SDL_HAT_UP         = 0x01;
const uint SDL_HAT_RIGHT      = 0x02;
const uint SDL_HAT_DOWN       = 0x04;
const uint SDL_HAT_LEFT       = 0x08;
const uint SDL_HAT_RIGHTUP          = (SDL_HAT_RIGHT|SDL_HAT_UP);
const uint SDL_HAT_LEFTUP           = (SDL_HAT_LEFT|SDL_HAT_UP);
 * The hat indices start at index 0.
Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat);

 * Get the ball axis change since the last poll
 * This returns 0, or -1 if you passed it invalid parameters.
 * The ball indices start at index 0.
int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy);

 * Get the current state of a button on a joystick
 * The button indices start at index 0.
Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button);

 * Close a joystick previously opened with SDL_JoystickOpen()
void SDL_JoystickClose(SDL_Joystick *joystick);

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