diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/joystick/SDL_joystick.c')
| -rw-r--r-- | distrib/sdl-1.2.12/src/joystick/SDL_joystick.c | 573 |
1 files changed, 573 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.12/src/joystick/SDL_joystick.c b/distrib/sdl-1.2.12/src/joystick/SDL_joystick.c new file mode 100644 index 0000000..5984a32 --- /dev/null +++ b/distrib/sdl-1.2.12/src/joystick/SDL_joystick.c @@ -0,0 +1,573 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2006 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + 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 + + Sam Lantinga + slouken@libsdl.org +*/ +#include "SDL_config.h" + +/* This is the joystick API for Simple DirectMedia Layer */ + +#include "SDL_events.h" +#include "SDL_sysjoystick.h" +#include "SDL_joystick_c.h" +#if !SDL_EVENTS_DISABLED +#include "../events/SDL_events_c.h" +#endif + +/* This is used for Quake III Arena */ +#if SDL_EVENTS_DISABLED +#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); + SDL_joysticks = (SDL_Joystick **)SDL_malloc(arraylen); + if ( SDL_joysticks == NULL ) { + SDL_numjoysticks = 0; + } else { + SDL_memset(SDL_joysticks, 0, arraylen); + SDL_numjoysticks = status; + } + 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 */ + joystick = (SDL_Joystick *)SDL_malloc((sizeof *joystick)); + if ( joystick != NULL ) { + SDL_memset(joystick, 0, (sizeof *joystick)); + joystick->index = device_index; + if ( SDL_SYS_JoystickOpen(joystick) < 0 ) { + SDL_free(joystick); + joystick = NULL; + } else { + 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); + joystick = 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)); + } + } + } + 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] ) { + SDL_memcpy(&SDL_joysticks[i], &SDL_joysticks[i+1], + (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 ) { + 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 */ + SDL_Lock_EventThread(); + SDL_numjoysticks = 0; + SDL_Unlock_EventThread(); + + /* Quit the joystick setup */ + SDL_SYS_JoystickQuit(); + if ( SDL_joysticks ) { + SDL_free(SDL_joysticks); + 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; +#if !SDL_EVENTS_DISABLED + 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); + } + } +#endif /* !SDL_EVENTS_DISABLED */ + 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; +#if !SDL_EVENTS_DISABLED + 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); + } + } +#endif /* !SDL_EVENTS_DISABLED */ + 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; +#if !SDL_EVENTS_DISABLED + 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); + } + } +#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 */ + + /* Update internal joystick state */ + joystick->buttons[button] = state; + + /* Post the event, if desired */ + posted = 0; +#if !SDL_EVENTS_DISABLED + 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); + } + } +#endif /* !SDL_EVENTS_DISABLED */ + 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) +{ +#if SDL_EVENTS_DISABLED + return SDL_IGNORE; +#else + const Uint8 event_list[] = { + SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION, + SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, + }; + 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 */ +} |