/*

Simple DirectMedia Layer

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 game controller API for Simple DirectMedia Layer */

#include "SDL_events.h"

#include "SDL_assert.h"

#include "SDL_sysjoystick.h"

#include "SDL_hints.h"

#if !SDL_EVENTS_DISABLED

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

#endif

#define ABS(_x) ((_x) < 0 ? -(_x) : (_x))

/* a list of currently opened game controllers */

static SDL_GameController *SDL_gamecontrollers = NULL;

/* keep track of the hat and mask value that transforms this hat movement into a button/axis press */

struct _SDL_HatMapping

{

int hat;

Uint8 mask;

};

#define k_nMaxReverseEntries 20

/**

* We are encoding the "HAT" as 0xhm. where h == hat ID and m == mask

* MAX 4 hats supported

*/

#define k_nMaxHatEntries 0x3f + 1

/* our in memory mapping db between joystick objects and controller mappings*/

struct _SDL_ControllerMapping

{

const char *name;

// mapping of axis/button id to controller version

int axes[SDL_CONTROLLER_AXIS_MAX];

// reverse mapping, joystick indices to buttons

SDL_GameControllerAxis raxes[k_nMaxReverseEntries];

SDL_GameControllerAxis rbuttonasaxis[k_nMaxReverseEntries];

SDL_GameControllerButton rbuttons[k_nMaxReverseEntries];

SDL_GameControllerButton raxesasbutton[k_nMaxReverseEntries];

SDL_GameControllerButton rhatasbutton[k_nMaxHatEntries];

};

/* our hard coded list of mapping support */

typedef struct _ControllerMapping_t

{

struct _ControllerMapping_t *next;

} ControllerMapping_t;

/* default mappings we support */

const char *s_ControllerMappings [] =

{

#endif

#ifdef SDL_JOYSTICK_DINPUT

"88880803000000000000504944564944,PS3 Controller,a:b2,b:b1,x:b0,y:b3,start:b11,back:b8,leftstick:b9,rightstick:b10,leftshoulder:b4,rightshoulder:b5,dpup:h0.1,dpleft:h0.4,dpdown:h0.8,dpright:h0.2,leftx:a0,lefty:a1,rightx:a3,righty:a4,lefttrigger:b6,righttrigger:b7,guide:b12",

"4c056802000000000000504944564944,PS3 Controller,a:b14,b:b13,y:b12,x:b15,start:b3,guide:b16,back:b0,leftstick:b1,rightstick:b2,leftshoulder:b10,rightshoulder:b11,dpup:b4,dpleft:b7,dpdown:b6,dpright:b5,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:b8,righttrigger:b9,",

#elif defined(__MACOSX__)

"5e040000000000008e02000000000000,X360 Controller,a:b0,b:b1,y:b3,x:b2,start:b8,guide:b10,back:b9,dpup:b11,dpleft:b13,dpdown:b12,dpright:b14,leftshoulder:b4,rightshoulder:b5,leftstick:b6,rightstick:b7,leftx:a0,lefty:a1,rightx:a3,righty:a4,lefttrigger:a2,righttrigger:a5",

"4c050000000000006802000000000000,PS3 Controller,a:b14,b:b13,x:b12,y:b15,start:b3,guide:b16,back:b0,leftstick:b1,rightstick:b2,leftshoulder:b10,rightshoulder:b11,dpup:b4,dpleft:b6,dpdown:b7,dpright:b5,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:b8,righttrigger:b9",

"6d040000000000001fc2000000000000,Logitech F710 Gamepad Controller (XInput),a:b0,b:b1,y:b3,x:b2,start:b8,guide:b10,back:b9,leftstick:b6,rightstick:b7,leftshoulder:b4,rightshoulder:b5,dpup:b11,dpleft:b13,dpdown:b12,dpright:b14,leftx:a0,lefty:a1,rightx:a3,righty:a4,lefttrigger:a2,righttrigger:a5,",

"6d0400000000000016c2000000000000,Logitech F310 Gamepad Controller (DInput),a:b1,b:b2,y:b3,x:b0,start:b9,back:b8,leftstick:b10,rightstick:b11,leftshoulder:b4,rightshoulder:b5,dpup:h0.1,dpleft:h0.8,dpdown:h0.4,dpright:h0.2,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:b6,righttrigger:b7,", // Guide button doesn't seem to be sent in DInput mode.

"6d0400000000000019c2000000000000,Logitech Wireless Gamepad Controller (DInput),a:b1,b:b2,y:b3,x:b0,start:b9,back:b8,leftstick:b10,rightstick:b11,leftshoulder:b4,rightshoulder:b5,dpup:h0.1,dpleft:h0.8,dpdown:h0.4,dpright:h0.2,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:b6,righttrigger:b7,", // This includes F710 in DInput mode and the "Logitech Cordless RumblePad 2", at the very least.

"030000005e0400008e02000010010000,X360 Controller,a:b0,b:b1,y:b3,x:b2,start:b7,guide:b8,back:b6,leftstick:b9,rightstick:b10,leftshoulder:b4,rightshoulder:b5,dpup:h0.1,dpleft:h0.8,dpdown:h0.4,dpright:h0.2,leftx:a0,lefty:a1,rightx:a3,righty:a4,lefttrigger:a2,righttrigger:a5,",

"030000005e0400001907000000010000,X360 Wireless Controller,a:b0,b:b1,y:b3,x:b2,start:b7,guide:b8,back:b6,leftstick:b9,rightstick:b10,leftshoulder:b4,rightshoulder:b5,dpup:b13,dpleft:b11,dpdown:b14,dpright:b12,leftx:a0,lefty:a1,rightx:a3,righty:a4,lefttrigger:a2,righttrigger:a5,",

#endif

NULL

};

static ControllerMapping_t *s_pSupportedControllers = NULL;

/* The SDL game controller structure */

struct _SDL_GameController

{

SDL_Joystick *joystick; /* underlying joystick device */

int ref_count;

struct _SDL_ControllerMapping mapping; /* the mapping object for this controller */

struct _SDL_GameController *next; /* pointer to next game controller we have allocated */

};

int SDL_PrivateGameControllerAxis(SDL_GameController * gamecontroller, SDL_GameControllerAxis axis, Sint16 value);

int SDL_PrivateGameControllerButton(SDL_GameController * gamecontroller, SDL_GameControllerButton button, Uint8 state);

/*

* Event filter to fire controller events from joystick ones

*/

int SDL_GameControllerEventWatcher(void *userdata, SDL_Event * event)

{

switch( event->type )

{

case SDL_JOYAXISMOTION:

{

SDL_GameController *controllerlist;

if ( event->jaxis.axis >= k_nMaxReverseEntries ) break;

while ( controllerlist )

{

if ( controllerlist->joystick->instance_id == event->jaxis.which )

{

if ( controllerlist->mapping.raxes[event->jaxis.axis] >= 0 ) // simple axis to axis, send it through

{

SDL_GameControllerAxis axis = controllerlist->mapping.raxes[event->jaxis.axis];

Sint16 value = event->jaxis.value;

switch (axis)

{

case SDL_CONTROLLER_AXIS_TRIGGERLEFT:

case SDL_CONTROLLER_AXIS_TRIGGERRIGHT:

/* Shift it to be 0 - 32767. */

default:

break;

}

SDL_PrivateGameControllerAxis( controllerlist, axis, value );

}

else if ( controllerlist->mapping.raxesasbutton[event->jaxis.axis] >= 0 ) // simlate an axis as a button

{

}

break;

}

controllerlist = controllerlist->next;

}

}

break;

case SDL_JOYBUTTONDOWN:

case SDL_JOYBUTTONUP:

{

SDL_GameController *controllerlist;

if ( event->jbutton.button >= k_nMaxReverseEntries ) break;

while ( controllerlist )

{

if ( controllerlist->joystick->instance_id == event->jbutton.which )

{

if ( controllerlist->mapping.rbuttons[event->jbutton.button] >= 0 ) // simple button as button

{

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rbuttons[event->jbutton.button], event->jbutton.state );

}

else if ( controllerlist->mapping.rbuttonasaxis[event->jbutton.button] >= 0 ) // an button pretending to be an axis

{

}

break;

}

controllerlist = controllerlist->next;

}

}

break;

case SDL_JOYHATMOTION:

{

SDL_GameController *controllerlist;

if ( event->jhat.hat >= 4 ) break;

Uint8 bSame = controllerlist->hatState[event->jhat.hat] & event->jhat.value;

// Get list of removed bits (button release)

Uint8 bChanged = controllerlist->hatState[event->jhat.hat] ^ bSame;

// the hat idx in the high nibble

int bHighHat = event->jhat.hat << 4;

if ( bChanged & SDL_HAT_DOWN )

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rhatasbutton[bHighHat | SDL_HAT_DOWN], SDL_RELEASED );

if ( bChanged & SDL_HAT_UP )

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rhatasbutton[bHighHat | SDL_HAT_UP], SDL_RELEASED );

if ( bChanged & SDL_HAT_LEFT )

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rhatasbutton[bHighHat | SDL_HAT_LEFT], SDL_RELEASED );

if ( bChanged & SDL_HAT_RIGHT )

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rhatasbutton[bHighHat | SDL_HAT_RIGHT], SDL_RELEASED );

// Get list of added bits (button press)

bChanged = event->jhat.value ^ bSame;

if ( bChanged & SDL_HAT_DOWN )

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rhatasbutton[bHighHat | SDL_HAT_DOWN], SDL_PRESSED );

if ( bChanged & SDL_HAT_UP )

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rhatasbutton[bHighHat | SDL_HAT_UP], SDL_PRESSED );

if ( bChanged & SDL_HAT_LEFT )

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rhatasbutton[bHighHat | SDL_HAT_LEFT], SDL_PRESSED );

if ( bChanged & SDL_HAT_RIGHT )

SDL_PrivateGameControllerButton( controllerlist, controllerlist->mapping.rhatasbutton[bHighHat | SDL_HAT_RIGHT], SDL_PRESSED );

// update our state cache

controllerlist->hatState[event->jhat.hat] = event->jhat.value;

break;

}

}

break;

case SDL_JOYDEVICEADDED:

{

if ( SDL_IsGameController(event->jdevice.which ) )

{

SDL_Event deviceevent;

deviceevent.type = SDL_CONTROLLERDEVICEADDED;

deviceevent.cdevice.which = event->jdevice.which;

SDL_PushEvent(&deviceevent);

}

}

break;

case SDL_JOYDEVICEREMOVED:

{

SDL_GameController *controllerlist = SDL_gamecontrollers;

while ( controllerlist )

{

if ( controllerlist->joystick->instance_id == event->jdevice.which )

{

SDL_Event deviceevent;

deviceevent.type = SDL_CONTROLLERDEVICEREMOVED;

deviceevent.cdevice.which = event->jdevice.which;

SDL_PushEvent(&deviceevent);

break;

}

controllerlist = controllerlist->next;

}

}

break;

default:

break;

}

return 1;

}

/*

ControllerMapping_t *pSupportedController = s_pSupportedControllers;

while ( pSupportedController )

{

if ( !SDL_memcmp( guid, &pSupportedController->guid, sizeof(*guid) ) )

{

return pSupportedController;

}

pSupportedController = pSupportedController->next;

}

return NULL;

}

/*

* Helper function to determine pre-caclulated offset to certain joystick mappings

*/

ControllerMapping_t *SDL_PrivateGetControllerMapping(int device_index)

{

if ( SDL_SYS_IsXInputDeviceIndex(device_index) && s_pXInputMapping )

{

return s_pXInputMapping;

}

{

SDL_JoystickGUID jGUID = SDL_JoystickGetDeviceGUID( device_index );

}

return NULL;

}

static const char* map_StringForControllerAxis[] = {

"leftx",

"lefty",

"rightx",

"righty",

"lefttrigger",

"righttrigger",

NULL

};

/*

* convert a string to its enum equivalent

*/

if ( !pchString || !pchString[0] )

return SDL_CONTROLLER_AXIS_INVALID;

for ( entry = 0; map_StringForControllerAxis[entry]; ++entry)

{

if ( !SDL_strcasecmp( pchString, map_StringForControllerAxis[entry] ) )

return entry;

}

return SDL_CONTROLLER_AXIS_INVALID;

}

/*

* convert an enum to its string equivalent

*/

const char* SDL_GameControllerGetStringForAxis( SDL_GameControllerAxis axis )

{

if (axis > SDL_CONTROLLER_AXIS_INVALID && axis < SDL_CONTROLLER_AXIS_MAX)

{

return map_StringForControllerAxis[axis];

}

return NULL;

}

static const char* map_StringForControllerButton[] = {

"a",

"b",

"x",

"y",

"back",

"guide",

"start",

"leftstick",

"rightstick",

"leftshoulder",

"rightshoulder",

"dpup",

"dpdown",

"dpleft",

"dpright",

NULL

};

/*

* convert a string to its enum equivalent

*/

if ( !pchString || !pchString[0] )

return SDL_CONTROLLER_BUTTON_INVALID;

for ( entry = 0; map_StringForControllerButton[entry]; ++entry)

{

if ( !SDL_strcasecmp( pchString, map_StringForControllerButton[entry] ) )

return entry;

}

return SDL_CONTROLLER_BUTTON_INVALID;

}

/*

* convert an enum to its string equivalent

*/

const char* SDL_GameControllerGetStringForButton( SDL_GameControllerButton axis )

{

if (axis > SDL_CONTROLLER_BUTTON_INVALID && axis < SDL_CONTROLLER_BUTTON_MAX)

{

return map_StringForControllerButton[axis];

}

return NULL;

}

/*

* given a controller button name and a joystick name update our mapping structure with it

*/

void SDL_PrivateGameControllerParseButton( const char *szGameButton, const char *szJoystickButton, struct _SDL_ControllerMapping *pMapping )

{

int iSDLButton = 0;

SDL_GameControllerButton button;

SDL_GameControllerAxis axis;

button = SDL_GameControllerGetButtonFromString( szGameButton );

axis = SDL_GameControllerGetAxisFromString( szGameButton );

iSDLButton = SDL_atoi( &szJoystickButton[1] );

if ( szJoystickButton[0] == 'a' )

{

if ( iSDLButton >= k_nMaxReverseEntries )

{

SDL_SetError("Axis index too large: %d", iSDLButton );

return;

}

if ( axis != SDL_CONTROLLER_AXIS_INVALID )

{

pMapping->axes[ axis ] = iSDLButton;

pMapping->raxes[ iSDLButton ] = axis;

}

else if ( button != SDL_CONTROLLER_BUTTON_INVALID )

{

pMapping->axesasbutton[ button ] = iSDLButton;

pMapping->raxesasbutton[ iSDLButton ] = button;

}

else

{

SDL_assert( !"How did we get here?" );

}

}

else if ( szJoystickButton[0] == 'b' )

{

if ( iSDLButton >= k_nMaxReverseEntries )

{

SDL_SetError("Button index too large: %d", iSDLButton );

return;

}

if ( button != SDL_CONTROLLER_BUTTON_INVALID )

{

pMapping->buttons[ button ] = iSDLButton;

pMapping->rbuttons[ iSDLButton ] = button;

}

else if ( axis != SDL_CONTROLLER_AXIS_INVALID )

{

pMapping->buttonasaxis[ axis ] = iSDLButton;

pMapping->rbuttonasaxis[ iSDLButton ] = axis;

}

else

{

SDL_assert( !"How did we get here?" );

}

}

else if ( szJoystickButton[0] == 'h' )

{

int hat = SDL_atoi( &szJoystickButton[1] );

int mask = SDL_atoi( &szJoystickButton[3] );

if (hat >= 4) {

SDL_SetError("Hat index too large: %d", iSDLButton );

}

if ( button != SDL_CONTROLLER_BUTTON_INVALID )

{

pMapping->hatasbutton[ button ].hat = hat;

pMapping->hatasbutton[ button ].mask = mask;

}

else if ( axis != SDL_CONTROLLER_AXIS_INVALID )

{

}

else

{

SDL_assert( !"How did we get here?" );

}

}

}

/*

* given a controller mapping string update our mapping object

*/

static void

SDL_PrivateGameControllerParseControllerConfigString( struct _SDL_ControllerMapping *pMapping, const char *pchString )

{

char szGameButton[20];

char szJoystickButton[20];

SDL_bool bGameButton = SDL_TRUE;

int i = 0;

const char *pchPos = pchString;

SDL_memset( szGameButton, 0x0, sizeof(szGameButton) );

SDL_memset( szJoystickButton, 0x0, sizeof(szJoystickButton) );

while ( pchPos && *pchPos )

{

if ( *pchPos == ':' )

{

i = 0;

bGameButton = SDL_FALSE;

}

else if ( *pchPos == ' ' )

{

}

else if ( *pchPos == ',' )

{

i = 0;

bGameButton = SDL_TRUE;

SDL_PrivateGameControllerParseButton( szGameButton, szJoystickButton, pMapping );

SDL_memset( szGameButton, 0x0, sizeof(szGameButton) );

SDL_memset( szJoystickButton, 0x0, sizeof(szJoystickButton) );

}

else if ( bGameButton )

{

if ( i >= sizeof(szGameButton))

{

SDL_SetError( "Button name too large: %s", szGameButton );

return;

}

szGameButton[i] = *pchPos;

i++;

}

else

{

if ( i >= sizeof(szJoystickButton))

{

SDL_SetError( "Joystick button name too large: %s", szJoystickButton );

return;

}

szJoystickButton[i] = *pchPos;

i++;

}

pchPos++;

}

SDL_PrivateGameControllerParseButton( szGameButton, szJoystickButton, pMapping );

}

/*

* Make a new button mapping struct

*/

{

int j;

pMapping->guid = guid;

pMapping->name = pchName;

// set all the button mappings to non defaults

for ( j = 0; j < SDL_CONTROLLER_AXIS_MAX; j++ )

{

pMapping->axes[j] = -1;

pMapping->buttonasaxis[j] = -1;

}

for ( j = 0; j < SDL_CONTROLLER_BUTTON_MAX; j++ )

{

pMapping->buttons[j] = -1;

pMapping->axesasbutton[j] = -1;

pMapping->hatasbutton[j].hat = -1;

}

for ( j = 0; j < k_nMaxReverseEntries; j++ )

{

pMapping->raxes[j] = SDL_CONTROLLER_AXIS_INVALID;

pMapping->rbuttons[j] = SDL_CONTROLLER_BUTTON_INVALID;

pMapping->raxesasbutton[j] = SDL_CONTROLLER_BUTTON_INVALID;

}

for (j = 0; j < k_nMaxHatEntries; j++)

{

pMapping->rhatasbutton[j] = SDL_CONTROLLER_BUTTON_INVALID;

}

SDL_PrivateGameControllerParseControllerConfigString( pMapping, pchMapping );

}

/*

* grab the guid string from a mapping string

*/

char *SDL_PrivateGetControllerGUIDFromMappingString( const char *pMapping )

{

const char *pFirstComma = SDL_strchr( pMapping, ',' );

if ( pFirstComma )

{

char *pchGUID = SDL_malloc( pFirstComma - pMapping + 1 );

if ( !pchGUID )

{

SDL_OutOfMemory();

return NULL;

}

SDL_memcpy( pchGUID, pMapping, pFirstComma - pMapping );

pchGUID[ pFirstComma - pMapping ] = 0;

return pchGUID;

}

return NULL;

}

/*

* grab the name string from a mapping string

*/

char *SDL_PrivateGetControllerNameFromMappingString( const char *pMapping )

{

const char *pFirstComma, *pSecondComma;

char *pchName;

pFirstComma = SDL_strchr( pMapping, ',' );

if ( !pFirstComma )

return NULL;

pSecondComma = SDL_strchr( pFirstComma + 1, ',' );

if ( !pSecondComma )

return NULL;

pchName = SDL_malloc( pSecondComma - pFirstComma );

if ( !pchName )

{

SDL_OutOfMemory();

return NULL;

}

SDL_memcpy( pchName, pFirstComma + 1, pSecondComma - pFirstComma );

pchName[ pSecondComma - pFirstComma - 1 ] = 0;

return pchName;

}

/*

* grab the button mapping string from a mapping string

*/

const char *pFirstComma, *pSecondComma;

pFirstComma = SDL_strchr( pMapping, ',' );

if ( !pFirstComma )

return NULL;

pSecondComma = SDL_strchr( pFirstComma + 1, ',' );

if ( !pSecondComma )

return NULL;

}

void SDL_PrivateGameControllerRefreshMapping( ControllerMapping_t *pControllerMapping )

{

SDL_GameController *gamecontrollerlist = SDL_gamecontrollers;

while ( gamecontrollerlist )

{

if ( !SDL_memcmp( &gamecontrollerlist->mapping.guid, &pControllerMapping->guid, sizeof(pControllerMapping->guid) ) )

{

SDL_Event event;

event.type = SDL_CONTROLLERDEVICEREMAPPED;

event.cdevice.which = gamecontrollerlist->joystick->instance_id;

SDL_PushEvent(&event);

// Not really threadsafe. Should this lock access within SDL_GameControllerEventWatcher?

SDL_PrivateLoadButtonMapping(&gamecontrollerlist->mapping, pControllerMapping->guid, pControllerMapping->name, pControllerMapping->mapping);

}

gamecontrollerlist = gamecontrollerlist->next;

}

}

/*

* Add or update an entry into the Mappings Database

*/

int

SDL_GameControllerAddMapping( const char *mappingString )

{

char *pchGUID;

char *pchName;

char *pchMapping;

SDL_JoystickGUID jGUID;

ControllerMapping_t *pControllerMapping;

SDL_bool is_xinput_mapping = SDL_FALSE;

#endif

pchGUID = SDL_PrivateGetControllerGUIDFromMappingString( mappingString );

if (!pchGUID) {

return -1;

}

if ( !SDL_strcasecmp( pchGUID, "xinput" ) ) {

is_xinput_mapping = SDL_TRUE;

}

#endif

SDL_free(pchGUID);

pControllerMapping = SDL_PrivateGetControllerMappingForGUID(&jGUID);

pchName = SDL_PrivateGetControllerNameFromMappingString( mappingString );

if (!pchName) return -1;

pchMapping = SDL_PrivateGetControllerMappingFromMappingString( mappingString );

if (!pchMapping) {

SDL_free( pchName );

return -1;

}

if (pControllerMapping) {

// Update existing mapping

SDL_free( pControllerMapping->name );

pControllerMapping->name = pchName;

SDL_free( pControllerMapping->mapping );

pControllerMapping->mapping = pchMapping;

// refresh open controllers

SDL_PrivateGameControllerRefreshMapping( pControllerMapping );

return 0;

} else {

pControllerMapping = SDL_malloc( sizeof(*pControllerMapping) );

if (!pControllerMapping) {

SDL_free( pchName );

SDL_free( pchMapping );

if ( is_xinput_mapping )

{

s_pXInputMapping = pControllerMapping;

}

#endif

pControllerMapping->guid = jGUID;

pControllerMapping->name = pchName;

pControllerMapping->mapping = pchMapping;

pControllerMapping->next = s_pSupportedControllers;

s_pSupportedControllers = pControllerMapping;

return 1;

}

}

/*

* Get the mapping string for this GUID

*/

char *

SDL_GameControllerMappingForGUID( SDL_JoystickGUID guid )

{

char *pMappingString = NULL;

ControllerMapping_t *mapping = SDL_PrivateGetControllerMappingForGUID(&guid);

if (mapping) {

char pchGUID[33];

size_t needed;

SDL_JoystickGetGUIDString(guid, pchGUID, sizeof(pchGUID));

// allocate enough memory for GUID + ',' + name + ',' + mapping + \0

needed = SDL_strlen(pchGUID) + 1 + SDL_strlen(mapping->name) + 1 + SDL_strlen(mapping->mapping) + 1;

pMappingString = SDL_malloc( needed );

SDL_snprintf( pMappingString, needed, "%s,%s,%s", pchGUID, mapping->name, mapping->mapping );

}

return pMappingString;

}

/*

* Get the mapping string for this device

*/

char *

SDL_GameControllerMapping( SDL_GameController * gamecontroller )

{

return SDL_GameControllerMappingForGUID( gamecontroller->mapping.guid );

}

static void

SDL_GameControllerLoadHints()

{

const char *hint = SDL_GetHint(SDL_HINT_GAMECONTROLLERCONFIG);

if ( hint && hint[0] ) {

int nchHints = SDL_strlen( hint );

char *pUserMappings = SDL_malloc( nchHints + 1 );

char *pTempMappings = pUserMappings;

SDL_memcpy( pUserMappings, hint, nchHints );

while ( pUserMappings ) {

char *pchNewLine = NULL;

pchNewLine = SDL_strchr( pUserMappings, '\n' );

if ( pchNewLine )

*pchNewLine = '\0';

SDL_GameControllerAddMapping( pUserMappings );

if ( pchNewLine )

pUserMappings = pchNewLine + 1;

else

pUserMappings = NULL;

}

SDL_free(pTempMappings);

}

}

/*

* Initialize the game controller system, mostly load our DB of controller config mappings

*/

int

SDL_GameControllerInit(void)

{

int i = 0;

const char *pMappingString = NULL;

s_pSupportedControllers = NULL;

pMappingString = s_ControllerMappings[i];

while ( pMappingString )

{

i++;

pMappingString = s_ControllerMappings[i];

}

// load in any user supplied config

/* watch for joy events and fire controller ones if needed */

SDL_AddEventWatch( SDL_GameControllerEventWatcher, NULL );

return (0);

}

/*

* Get the implementation dependent name of a controller

*/

const char *

SDL_GameControllerNameForIndex(int device_index)

{

ControllerMapping_t *pSupportedController = SDL_PrivateGetControllerMapping(device_index);

if ( pSupportedController )

{

return pSupportedController->name;

}

return NULL;

}

/*

* Return 1 if the joystick at this device index is a supported controller

*/

SDL_bool

SDL_IsGameController(int device_index)

{

ControllerMapping_t *pSupportedController = SDL_PrivateGetControllerMapping(device_index);

if ( pSupportedController )

{

return SDL_FALSE;

}

/*

* Open a controller for use - the index passed as an argument refers to

* the N'th controller on the system. This index is the value which will

* identify this controller in future controller events.

*

* This function returns a controller identifier, or NULL if an error occurred.

*/

SDL_GameController *

SDL_GameControllerOpen(int device_index)

{

SDL_GameController *gamecontroller;

SDL_GameController *gamecontrollerlist;

ControllerMapping_t *pSupportedController = NULL;

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

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

return (NULL);

}

gamecontrollerlist = SDL_gamecontrollers;

// If the controller is already open, return it

while ( gamecontrollerlist )

{

if ( SDL_SYS_GetInstanceIdOfDeviceIndex(device_index) == gamecontrollerlist->joystick->instance_id ) {

gamecontroller = gamecontrollerlist;

++gamecontroller->ref_count;

return (gamecontroller);

}

gamecontrollerlist = gamecontrollerlist->next;

}

SDL_SetError("Couldn't find mapping for device (%d)", device_index );

return (NULL);

}

// Create and initialize the joystick

gamecontroller = (SDL_GameController *) SDL_malloc((sizeof *gamecontroller));

if (gamecontroller == NULL) {

SDL_OutOfMemory();

return NULL;

}

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

gamecontroller->joystick = SDL_JoystickOpen(device_index);

if ( !gamecontroller->joystick ) {

SDL_free(gamecontroller);

return NULL;

}

SDL_PrivateLoadButtonMapping( &gamecontroller->mapping, pSupportedController->guid, pSupportedController->name, pSupportedController->mapping );

// Add joystick to list

++gamecontroller->ref_count;

// Link the joystick in the list

gamecontroller->next = SDL_gamecontrollers;

SDL_gamecontrollers = gamecontroller;

SDL_SYS_JoystickUpdate( gamecontroller->joystick );

return (gamecontroller);

}