/*

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"

/* This is the joystick API for Simple DirectMedia Layer */

#include "SDL_events.h"

#include "SDL_sysjoystick.h"

#include "SDL_assert.h"

#if !SDL_EVENTS_DISABLED

#include "../events/SDL_events_c.h"

#endif

int

SDL_JoystickInit(void)

{

int status;

status = SDL_SYS_JoystickInit();

if (status >= 0) {

}

return (status);

}

/*

* Count the number of joysticks attached to the system

*/

int

SDL_NumJoysticks(void)

{

}

/*

* Get the implementation dependent name of a joystick

*/

const char *

if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {

SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());

return (NULL);

}

}

/*

* 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)

{

SDL_Joystick *joystick;

SDL_Joystick *joysticklist;

const char *joystickname = NULL;

if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {

SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());

return (NULL);

}

joysticklist = SDL_joysticks;

/* If the joystick is already open, return it

* it is important that we have a single joystick * for each instance id

*/

while ( joysticklist )

{

if ( SDL_SYS_GetInstanceIdOfDeviceIndex(device_index) == joysticklist->instance_id ) {

joystick = joysticklist;

++joystick->ref_count;

return (joystick);

}

joysticklist = joysticklist->next;

}

/* Create and initialize the joystick */

joystick = (SDL_Joystick *) SDL_malloc((sizeof *joystick));

if (joystick == NULL) {

SDL_OutOfMemory();

return NULL;

}

SDL_memset(joystick, 0, (sizeof *joystick));

SDL_free(joystick);

return NULL;

}

joystickname = SDL_SYS_JoystickNameForIndex( device_index );

if ( joystickname )

joystick->name = SDL_strdup( joystickname );

else

joystick->name = NULL;

if (joystick->naxes > 0) {

joystick->axes = (Sint16 *) SDL_malloc

(joystick->naxes * sizeof(Sint16));

}

if (joystick->nhats > 0) {

joystick->hats = (Uint8 *) SDL_malloc

(joystick->nhats * sizeof(Uint8));

}

if (joystick->nballs > 0) {

joystick->balls = (struct balldelta *) SDL_malloc

(joystick->nballs * sizeof(*joystick->balls));

}

if (joystick->nbuttons > 0) {

joystick->buttons = (Uint8 *) SDL_malloc

(joystick->nbuttons * sizeof(Uint8));

}

if (((joystick->naxes > 0) && !joystick->axes)

|| ((joystick->nhats > 0) && !joystick->hats)

|| ((joystick->nballs > 0) && !joystick->balls)

|| ((joystick->nbuttons > 0) && !joystick->buttons)) {

SDL_OutOfMemory();

SDL_JoystickClose(joystick);

return NULL;

}

if (joystick->axes) {

SDL_memset(joystick->axes, 0, joystick->naxes * sizeof(Sint16));

}

if (joystick->hats) {

SDL_memset(joystick->hats, 0, joystick->nhats * sizeof(Uint8));

}

if (joystick->balls) {

SDL_memset(joystick->balls, 0,

joystick->nballs * sizeof(*joystick->balls));

}

if (joystick->buttons) {

SDL_memset(joystick->buttons, 0, joystick->nbuttons * sizeof(Uint8));

}

/* Add joystick to list */

++joystick->ref_count;

/* Link the joystick in the list */

joystick->next = SDL_joysticks;

SDL_joysticks = joystick;

}

/*

* Checks to make sure the joystick is valid.

*/

int

{

int valid;

SDL_SetError("Joystick hasn't been opened yet");

valid = 0;

} else {

valid = 1;

}

if ( joystick && joystick->closed )

{

valid = 0;

}

return valid;

}

/*

* Get the number of multi-dimensional axis controls on a joystick

*/

int

SDL_JoystickNumAxes(SDL_Joystick * joystick)

{

return (-1);

}

return (joystick->naxes);

}

/*

* Get the number of hats on a joystick

*/

int

SDL_JoystickNumHats(SDL_Joystick * joystick)

{

return (-1);

}

return (joystick->nhats);

}

/*

* Get the number of trackballs on a joystick

*/

int

SDL_JoystickNumBalls(SDL_Joystick * joystick)

{

return (-1);

}

return (joystick->nballs);

}

/*

* Get the number of buttons on a joystick

*/

int

SDL_JoystickNumButtons(SDL_Joystick * joystick)

{

return (-1);

}

return (joystick->nbuttons);

}

/*

* Get the current state of an axis control on a joystick

*/

Sint16

SDL_JoystickGetAxis(SDL_Joystick * joystick, int axis)

{

Sint16 state;

return (0);

}

if (axis < joystick->naxes) {

state = joystick->axes[axis];

} else {

SDL_SetError("Joystick only has %d axes", joystick->naxes);

state = 0;

}

return (state);

}

/*

* Get the current state of a hat on a joystick

*/

Uint8

SDL_JoystickGetHat(SDL_Joystick * joystick, int hat)

{

Uint8 state;

return (0);

}

if (hat < joystick->nhats) {

state = joystick->hats[hat];

} else {

SDL_SetError("Joystick only has %d hats", joystick->nhats);

state = 0;

}

return (state);

}

/*

* Get the ball axis change since the last poll

*/

int

SDL_JoystickGetBall(SDL_Joystick * joystick, int ball, int *dx, int *dy)

{

int retval;

return (-1);

}

retval = 0;

if (ball < joystick->nballs) {

if (dx) {

*dx = joystick->balls[ball].dx;

}

if (dy) {

*dy = joystick->balls[ball].dy;

}

joystick->balls[ball].dx = 0;

joystick->balls[ball].dy = 0;

} else {

SDL_SetError("Joystick only has %d balls", joystick->nballs);

retval = -1;

}

return (retval);

}

/*

* Get the current state of a button on a joystick

*/

Uint8

SDL_JoystickGetButton(SDL_Joystick * joystick, int button)

{

Uint8 state;

return (0);

}

if (button < joystick->nbuttons) {

state = joystick->buttons[button];

} else {

SDL_SetError("Joystick only has %d buttons", joystick->nbuttons);

state = 0;

}

return (state);

}

/*

* Return if the joystick in question is currently attached to the system,

* \return 0 if not plugged in, 1 if still present.

*/

int

SDL_JoystickGetAttached( SDL_Joystick * joystick )

{

if (!SDL_PrivateJoystickValid(joystick)) {

return (0);

}

return SDL_SYS_JoystickAttached(joystick);

}

/*

* Get the instance id for this opened joystick

*/

SDL_JoystickID

SDL_JoystickInstanceID( SDL_Joystick * joystick )

{

if (!SDL_PrivateJoystickValid(joystick)) {

return (-1);

}

return (joystick->instance_id);

}

/*

* Get the friendly name of this joystick

*/

const char *

SDL_JoystickName(SDL_Joystick * joystick)

{

if (!SDL_PrivateJoystickValid(joystick)) {

return (NULL);

}

return (joystick->name);

}

/*

* Close a joystick previously opened with SDL_JoystickOpen()

*/

void

SDL_JoystickClose(SDL_Joystick * joystick)

{

SDL_Joystick *joysticklist;

SDL_Joystick *joysticklistprev;

return;

}

/* First decrement ref count */

if (--joystick->ref_count > 0) {

return;

}

SDL_SYS_JoystickClose(joystick);

joysticklist = SDL_joysticks;

joysticklistprev = NULL;

while ( joysticklist )

{

if (joystick == joysticklist)

{

if ( joysticklistprev )

{

// unlink this entry

joysticklistprev->next = joysticklist->next;

}

else

{

SDL_joysticks = joystick->next;

}

break;

}

joysticklistprev = joysticklist;

joysticklist = joysticklist->next;

}

if (joystick->name)

SDL_free(joystick->name);

/* Free the data associated with this joystick */

if (joystick->axes) {

SDL_free(joystick->axes);

}

if (joystick->hats) {

SDL_free(joystick->hats);

}

if (joystick->balls) {

SDL_free(joystick->balls);

}

if (joystick->buttons) {

SDL_free(joystick->buttons);

}

SDL_free(joystick);

}

void

SDL_JoystickQuit(void)

{

/* Stop the event polling */

while ( SDL_joysticks )

{

SDL_joysticks->ref_count = 1;

SDL_JoystickClose(SDL_joysticks);

}

/* Quit the joystick setup */

SDL_SYS_JoystickQuit();

}

/* These are global for SDL_sysjoystick.c and SDL_events.c */

int

SDL_PrivateJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)

{

int posted;

/* Make sure we're not getting garbage events */

if (axis >= joystick->naxes) {

return 0;

}

/* Update internal joystick state */

joystick->axes[axis] = value;

/* Post the event, if desired */

posted = 0;

#if !SDL_EVENTS_DISABLED

if (SDL_GetEventState(SDL_JOYAXISMOTION) == SDL_ENABLE) {

SDL_Event event;

event.type = SDL_JOYAXISMOTION;

event.jaxis.axis = axis;

event.jaxis.value = value;

}

#endif /* !SDL_EVENTS_DISABLED */

return (posted);

}

int

SDL_PrivateJoystickHat(SDL_Joystick * joystick, Uint8 hat, Uint8 value)

{

int posted;

/* Make sure we're not getting garbage events */

if (hat >= joystick->nhats) {

return 0;

}

/* Update internal joystick state */

joystick->hats[hat] = value;

/* Post the event, if desired */

posted = 0;

#if !SDL_EVENTS_DISABLED

if (SDL_GetEventState(SDL_JOYHATMOTION) == SDL_ENABLE) {

SDL_Event event;

event.jhat.type = SDL_JOYHATMOTION;

event.jhat.hat = hat;

event.jhat.value = value;

}

#endif /* !SDL_EVENTS_DISABLED */

return (posted);

}

int

SDL_PrivateJoystickBall(SDL_Joystick * joystick, Uint8 ball,

Sint16 xrel, Sint16 yrel)

{

int posted;

/* Make sure we're not getting garbage events */

if (ball >= joystick->nballs) {

return 0;

}

/* Update internal mouse state */

joystick->balls[ball].dx += xrel;

joystick->balls[ball].dy += yrel;

/* Post the event, if desired */

posted = 0;

#if !SDL_EVENTS_DISABLED

if (SDL_GetEventState(SDL_JOYBALLMOTION) == SDL_ENABLE) {

SDL_Event event;

event.jball.type = SDL_JOYBALLMOTION;

event.jball.ball = ball;

event.jball.xrel = xrel;

event.jball.yrel = yrel;

}

#endif /* !SDL_EVENTS_DISABLED */

return (posted);

}

int

SDL_PrivateJoystickButton(SDL_Joystick * joystick, Uint8 button, Uint8 state)

{

int posted;

#if !SDL_EVENTS_DISABLED

SDL_Event event;

switch (state) {

case SDL_PRESSED:

event.type = SDL_JOYBUTTONDOWN;

break;

case SDL_RELEASED:

event.type = SDL_JOYBUTTONUP;

break;

default:

/* Invalid state -- bail */

return (0);

}

#endif /* !SDL_EVENTS_DISABLED */

/* Make sure we're not getting garbage events */

if (button >= joystick->nbuttons) {

return 0;

}

/* Update internal joystick state */

joystick->buttons[button] = state;

/* Post the event, if desired */

posted = 0;

#if !SDL_EVENTS_DISABLED

if (SDL_GetEventState(event.type) == SDL_ENABLE) {

event.jbutton.button = button;

event.jbutton.state = state;

}

#endif /* !SDL_EVENTS_DISABLED */

return (posted);

}

void

SDL_JoystickUpdate(void)

{

SDL_Joystick *joystick;

joystick = SDL_joysticks;

while ( joystick )

{

SDL_Joystick *joysticknext;

/* save off the next pointer, the Update call may cause a joystick removed event

* and cause our joystick pointer to be freed

*/

joysticknext = joystick->next;

SDL_SYS_JoystickUpdate( joystick );

if ( joystick->closed && joystick->uncentered )

{

int i;

joystick->uncentered = 0;

// Tell the app that everything is centered/unpressed...

for (i = 0; i < joystick->naxes; i++)

SDL_PrivateJoystickAxis(joystick, i, 0);

for (i = 0; i < joystick->nbuttons; i++)

SDL_PrivateJoystickButton(joystick, i, 0);

for (i = 0; i < joystick->nhats; i++)

SDL_PrivateJoystickHat(joystick, i, SDL_HAT_CENTERED);

}

joystick = joysticknext;

}

SDL_SYS_JoystickDetect();

}

int

SDL_JoystickEventState(int state)

{

#if SDL_EVENTS_DISABLED

return SDL_IGNORE;

#else

const Uint32 event_list[] = {

SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION,

};

unsigned int i;

switch (state) {

case SDL_QUERY:

state = SDL_IGNORE;

for (i = 0; i < SDL_arraysize(event_list); ++i) {

state = SDL_EventState(event_list[i], SDL_QUERY);

if (state == SDL_ENABLE) {

break;

}

}

break;

default:

for (i = 0; i < SDL_arraysize(event_list); ++i) {

SDL_EventState(event_list[i], state);

}

break;

}

return (state);

#endif /* SDL_EVENTS_DISABLED */

}

/* return 1 if you want to run the joystick update loop this frame, used by hotplug support */

int

SDL_PrivateJoystickNeedsPolling()

{

if ( SDL_SYS_JoystickNeedsPolling() )

{

// sys layer needs us to think

return 1;

}

else

{

// otherwise only do it if a joystick is opened

return SDL_joysticks != NULL;

}

}

/* return the guid for this index*/

JoystickGUID SDL_JoystickGetDeviceGUID( int device_index )

{

return SDL_SYS_PrivateJoystickGetDeviceID( device_index );

}

/* return the guid for this openeded device*/

JoystickGUID SDL_JoystickGetGUID(SDL_Joystick * joystick)

{

return SDL_SYS_PrivateJoystickGetGUID( joystick );

}

/* convert the guid to a printable string */

char *SDL_JoystickGetGUIDString(JoystickGUID guid)

{

static const char k_rgchHexToASCII[] = "0123456789abcdef";

char *pchOut = NULL;

char *pchString = NULL;

int i;

pchString = SDL_malloc(33); // 16 bytes

if ( !pchString )

{

SDL_OutOfMemory();

return NULL;

}

pchOut = pchString;

for ( i = 0; i < sizeof(guid); i++ )

{

// each input byte writes 2 ascii chars, and might write a null byte.

// If we don't have room for next input byte, stop

unsigned char c = guid.data[i];

*pchOut++ = k_rgchHexToASCII[ c >> 4 ];

*pchOut++ = k_rgchHexToASCII[ c & 0x0F ];

}

*pchOut = '\0';

return pchString;

}

//-----------------------------------------------------------------------------

// Purpose: Returns the 4 bit nibble for a hex character

// Input : c -

// Output : unsigned char

//-----------------------------------------------------------------------------

static unsigned char nibble( char c )

{

if ( ( c >= '0' ) &&

( c <= '9' ) )

{

return (unsigned char)(c - '0');

}

if ( ( c >= 'A' ) &&

( c <= 'F' ) )

{

return (unsigned char)(c - 'A' + 0x0a);

}

if ( ( c >= 'a' ) &&

( c <= 'f' ) )

{

return (unsigned char)(c - 'a' + 0x0a);

}

// received an invalid character, and no real way to return an error

// AssertMsg1( false, "Q_nibble invalid hex character '%c' ", c );

return 0;

}

/* convert the string version of a joystick guid to the struct */

JoystickGUID SDL_JoystickGetGUIDFromString(const char *pchGUID)

{

JoystickGUID guid;

int maxoutputbytes= sizeof(guid);

int len = SDL_strlen( pchGUID );

Uint8 *p;

int i;

// Make sure it's even

len = ( len ) & ~0x1;

SDL_memset( &guid, 0x00, sizeof(guid) );

p = (Uint8 *)&guid;

for ( i = 0;

( i < len ) && ( ( p - (Uint8 *)&guid ) < maxoutputbytes );

i+=2, p++ )

{

*p = ( nibble( pchGUID[i] ) << 4 ) | nibble( pchGUID[i+1] );

}

return guid;

}