SDL_joystick.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* This is the joystick API for Simple DirectMedia Layer */
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#include "SDL_events.h"
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#include "SDL_sysjoystick.h"
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#include "SDL_joystick_c.h"
#if !SDL_EVENTS_DISABLED
#include "../events/SDL_events_c.h"
#endif
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/* This is used for Quake III Arena */
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#if SDL_EVENTS_DISABLED
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#define SDL_Lock_EventThread()
#define SDL_Unlock_EventThread()
#endif
Uint8 SDL_numjoysticks = 0;
SDL_Joystick **SDL_joysticks = NULL;
static SDL_Joystick *default_joystick = NULL;
int SDL_JoystickInit(void)
{
int arraylen;
int status;
SDL_numjoysticks = 0;
status = SDL_SYS_JoystickInit();
if ( status >= 0 ) {
arraylen = (status+1)*sizeof(*SDL_joysticks);
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SDL_joysticks = (SDL_Joystick **)SDL_malloc(arraylen);
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if ( SDL_joysticks == NULL ) {
SDL_numjoysticks = 0;
} else {
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SDL_memset(SDL_joysticks, 0, arraylen);
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SDL_numjoysticks = status;
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}
status = 0;
}
default_joystick = NULL;
return(status);
}
/*
* Count the number of joysticks attached to the system
*/
int SDL_NumJoysticks(void)
{
return SDL_numjoysticks;
}
/*
* Get the implementation dependent name of a joystick
*/
const char *SDL_JoystickName(int device_index)
{
if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) {
SDL_SetError("There are %d joysticks available",
SDL_numjoysticks);
return(NULL);
}
return(SDL_SYS_JoystickName(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)
{
int i;
SDL_Joystick *joystick;
if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) {
SDL_SetError("There are %d joysticks available",
SDL_numjoysticks);
return(NULL);
}
/* If the joystick is already open, return it */
for ( i=0; SDL_joysticks[i]; ++i ) {
if ( device_index == SDL_joysticks[i]->index ) {
joystick = SDL_joysticks[i];
++joystick->ref_count;
return(joystick);
}
}
/* Create and initialize the joystick */
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joystick = (SDL_Joystick *)SDL_malloc((sizeof *joystick));
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if ( joystick != NULL ) {
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SDL_memset(joystick, 0, (sizeof *joystick));
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joystick->index = device_index;
if ( SDL_SYS_JoystickOpen(joystick) < 0 ) {
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SDL_free(joystick);
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joystick = NULL;
} else {
if ( joystick->naxes > 0 ) {
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joystick->axes = (Sint16 *)SDL_malloc
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(joystick->naxes*sizeof(Sint16));
}
if ( joystick->nhats > 0 ) {
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joystick->hats = (Uint8 *)SDL_malloc
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(joystick->nhats*sizeof(Uint8));
}
if ( joystick->nballs > 0 ) {
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joystick->balls = (struct balldelta *)SDL_malloc
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(joystick->nballs*sizeof(*joystick->balls));
}
if ( joystick->nbuttons > 0 ) {
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joystick->buttons = (Uint8 *)SDL_malloc
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(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);
joystick = NULL;
}
if ( joystick->axes ) {
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SDL_memset(joystick->axes, 0,
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joystick->naxes*sizeof(Sint16));
}
if ( joystick->hats ) {
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SDL_memset(joystick->hats, 0,
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joystick->nhats*sizeof(Uint8));
}
if ( joystick->balls ) {
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SDL_memset(joystick->balls, 0,
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joystick->nballs*sizeof(*joystick->balls));
}
if ( joystick->buttons ) {
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SDL_memset(joystick->buttons, 0,
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joystick->nbuttons*sizeof(Uint8));
}
}
}
if ( joystick ) {
/* Add joystick to list */
++joystick->ref_count;
SDL_Lock_EventThread();
for ( i=0; SDL_joysticks[i]; ++i )
/* Skip to next joystick */;
SDL_joysticks[i] = joystick;
SDL_Unlock_EventThread();
}
return(joystick);
}
/*
* Returns 1 if the joystick has been opened, or 0 if it has not.
*/
int SDL_JoystickOpened(int device_index)
{
int i, opened;
opened = 0;
for ( i=0; SDL_joysticks[i]; ++i ) {
if ( SDL_joysticks[i]->index == (Uint8)device_index ) {
opened = 1;
break;
}
}
return(opened);
}
static int ValidJoystick(SDL_Joystick **joystick)
{
int valid;
if ( *joystick == NULL ) {
*joystick = default_joystick;
}
if ( *joystick == NULL ) {
SDL_SetError("Joystick hasn't been opened yet");
valid = 0;
} else {
valid = 1;
}
return valid;
}
/*
* Get the device index of an opened joystick.
*/
int SDL_JoystickIndex(SDL_Joystick *joystick)
{
if ( ! ValidJoystick(&joystick) ) {
return(-1);
}
return(joystick->index);
}
/*
* Get the number of multi-dimensional axis controls on a joystick
*/
int SDL_JoystickNumAxes(SDL_Joystick *joystick)
{
if ( ! ValidJoystick(&joystick) ) {
return(-1);
}
return(joystick->naxes);
}
/*
* Get the number of hats on a joystick
*/
int SDL_JoystickNumHats(SDL_Joystick *joystick)
{
if ( ! ValidJoystick(&joystick) ) {
return(-1);
}
return(joystick->nhats);
}
/*
* Get the number of trackballs on a joystick
*/
int SDL_JoystickNumBalls(SDL_Joystick *joystick)
{
if ( ! ValidJoystick(&joystick) ) {
return(-1);
}
return(joystick->nballs);
}
/*
* Get the number of buttons on a joystick
*/
int SDL_JoystickNumButtons(SDL_Joystick *joystick)
{
if ( ! ValidJoystick(&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;
if ( ! ValidJoystick(&joystick) ) {
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;
if ( ! ValidJoystick(&joystick) ) {
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;
if ( ! ValidJoystick(&joystick) ) {
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;
if ( ! ValidJoystick(&joystick) ) {
return(0);
}
if ( button < joystick->nbuttons ) {
state = joystick->buttons[button];
} else {
SDL_SetError("Joystick only has %d buttons",joystick->nbuttons);
state = 0;
}
return(state);
}
/*
* Close a joystick previously opened with SDL_JoystickOpen()
*/
void SDL_JoystickClose(SDL_Joystick *joystick)
{
int i;
if ( ! ValidJoystick(&joystick) ) {
return;
}
/* First decrement ref count */
if ( --joystick->ref_count > 0 ) {
return;
}
/* Lock the event queue - prevent joystick polling */
SDL_Lock_EventThread();
if ( joystick == default_joystick ) {
default_joystick = NULL;
}
SDL_SYS_JoystickClose(joystick);
/* Remove joystick from list */
for ( i=0; SDL_joysticks[i]; ++i ) {
if ( joystick == SDL_joysticks[i] ) {
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SDL_memcpy(&SDL_joysticks[i], &SDL_joysticks[i+1],
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(SDL_numjoysticks-i)*sizeof(joystick));
break;
}
}
/* Let the event thread keep running */
SDL_Unlock_EventThread();
/* Free the data associated with this joystick */
if ( joystick->axes ) {
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SDL_free(joystick->axes);
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}
if ( joystick->hats ) {
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SDL_free(joystick->hats);
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}
if ( joystick->balls ) {
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SDL_free(joystick->balls);
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}
if ( joystick->buttons ) {
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SDL_free(joystick->buttons);
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}
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SDL_free(joystick);
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}
void SDL_JoystickQuit(void)
{
/* Stop the event polling */
SDL_Lock_EventThread();
SDL_numjoysticks = 0;
SDL_Unlock_EventThread();
/* Quit the joystick setup */
SDL_SYS_JoystickQuit();
if ( SDL_joysticks ) {
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SDL_free(SDL_joysticks);
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SDL_joysticks = NULL;
}
}
/* These are global for SDL_sysjoystick.c and SDL_events.c */
int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value)
{
int posted;
/* Update internal joystick state */
joystick->axes[axis] = value;
/* Post the event, if desired */
posted = 0;
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#if !SDL_EVENTS_DISABLED
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if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) {
SDL_Event event;
event.type = SDL_JOYAXISMOTION;
event.jaxis.which = joystick->index;
event.jaxis.axis = axis;
event.jaxis.value = value;
if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
posted = 1;
SDL_PushEvent(&event);
}
}
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#endif /* !SDL_EVENTS_DISABLED */
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return(posted);
}
int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value)
{
int posted;
/* Update internal joystick state */
joystick->hats[hat] = value;
/* Post the event, if desired */
posted = 0;
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if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) {
SDL_Event event;
event.jhat.type = SDL_JOYHATMOTION;
event.jhat.which = joystick->index;
event.jhat.hat = hat;
event.jhat.value = value;
if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
posted = 1;
SDL_PushEvent(&event);
}
}
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#endif /* !SDL_EVENTS_DISABLED */
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return(posted);
}
int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball,
Sint16 xrel, Sint16 yrel)
{
int posted;
/* Update internal mouse state */
joystick->balls[ball].dx += xrel;
joystick->balls[ball].dy += yrel;
/* Post the event, if desired */
posted = 0;
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#if !SDL_EVENTS_DISABLED
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if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) {
SDL_Event event;
event.jball.type = SDL_JOYBALLMOTION;
event.jball.which = joystick->index;
event.jball.ball = ball;
event.jball.xrel = xrel;
event.jball.yrel = yrel;
if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
posted = 1;
SDL_PushEvent(&event);
}
}
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#endif /* !SDL_EVENTS_DISABLED */
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return(posted);
}
int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state)
{
int posted;
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#if !SDL_EVENTS_DISABLED
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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);
}
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#endif /* !SDL_EVENTS_DISABLED */
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/* Update internal joystick state */
joystick->buttons[button] = state;
/* Post the event, if desired */
posted = 0;
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#if !SDL_EVENTS_DISABLED
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if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) {
event.jbutton.which = joystick->index;
event.jbutton.button = button;
event.jbutton.state = state;
if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
posted = 1;
SDL_PushEvent(&event);
}
}
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#endif /* !SDL_EVENTS_DISABLED */
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return(posted);
}
void SDL_JoystickUpdate(void)
{
int i;
for ( i=0; SDL_joysticks[i]; ++i ) {
SDL_SYS_JoystickUpdate(SDL_joysticks[i]);
}
}
int SDL_JoystickEventState(int state)
{
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#if SDL_EVENTS_DISABLED
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return SDL_IGNORE;
#else
const Uint8 event_list[] = {
SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION,
SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP,
};
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unsigned int i;
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switch (state) {
case SDL_QUERY:
state = SDL_IGNORE;
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for ( i=0; i<SDL_arraysize(event_list); ++i ) {
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state = SDL_EventState(event_list[i],SDL_QUERY);
if ( state == SDL_ENABLE ) {
break;
}
}
break;
default:
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for ( i=0; i<SDL_arraysize(event_list); ++i ) {
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SDL_EventState(event_list[i], state);
}
break;
}
return(state);
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#endif /* SDL_EVENTS_DISABLED */
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}