src/joystick/android/SDL_sysjoystick.c
author Edward Rudd <urkle@outoforder.cc>
Wed, 26 Sep 2012 14:08:46 -0400
changeset 6462 5e09ac1aba80
parent 6212 78d854de3a66
child 6695 ec21e81c62aa
permissions -rwxr-xr-x
allocate *Hint structures per Xlib docs

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

#include "SDL_config.h"

#ifdef SDL_JOYSTICK_ANDROID

/* This is the system specific header for the SDL joystick API */
#include <stdio.h>              /* For the definition of NULL */

#include "SDL_error.h"
#include "SDL_events.h"
#include "SDL_joystick.h"
#include "../SDL_sysjoystick.h"
#include "../SDL_joystick_c.h"
#include "../../core/android/SDL_android.h"

static const char *accelerometerName = "Android accelerometer";

/* Function to scan the system for joysticks.
 * This function should set SDL_numjoysticks to the number of available
 * joysticks.  Joystick 0 should be the system default joystick.
 * It should return 0, or -1 on an unrecoverable fatal error.
 */
int
SDL_SYS_JoystickInit(void)
{
    SDL_numjoysticks = 1;
    
    return (1);
}

/* Function to get the device-dependent name of a joystick */
const char *
SDL_SYS_JoystickName(int index)
{
    if (index == 0) {
        return accelerometerName;
    } else {
        SDL_SetError("No joystick available with that index");
        return (NULL);
    }
}

/* Function to open a joystick for use.
   The joystick to open is specified by the index field of the joystick.
   This should fill the nbuttons and naxes fields of the joystick structure.
   It returns 0, or -1 if there is an error.
 */
int
SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
{
    joystick->nbuttons = 0;
    joystick->nhats = 0;
    joystick->nballs = 0;
    joystick->naxes = 3;
    joystick->name = accelerometerName;
    return 0;
}


/* Function to update the state of a joystick - called as a device poll.
 * This function shouldn't update the joystick structure directly,
 * but instead should call SDL_PrivateJoystick*() to deliver events
 * and update joystick device state.
 */
void
SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
{
    int i;
    Sint16 value;
    float values[3];

    if (Android_JNI_GetAccelerometerValues(values)) {
        for ( i = 0; i < 3; i++ ) {
            value = (Sint16)(values[i] * 32767.0f);
            SDL_PrivateJoystickAxis(joystick, i, value);
        }
    }
}

/* Function to close a joystick after use */
void
SDL_SYS_JoystickClose(SDL_Joystick * joystick)
{
}

/* Function to perform any system-specific joystick related cleanup */
void
SDL_SYS_JoystickQuit(void)
{
}

#endif /* SDL_JOYSTICK_NDS */

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