src/joystick/SDL_joystick.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 16 Feb 2006 10:11:48 +0000
changeset 1361 19418e4422cb
parent 1358 c71e05b4dc2e
child 1379 c0a74f199ecf
permissions -rw-r--r--
New configure-based build system. Still work in progress, but much improved
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/*
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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,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    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
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    License along with this library; if not, write to the Free Software
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    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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/* 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"
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#if !SDL_EVENTS_DISABLED
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#include "../events/SDL_events_c.h"
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#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()
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#define SDL_Unlock_EventThread()
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#endif
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Uint8 SDL_numjoysticks = 0;
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SDL_Joystick **SDL_joysticks = NULL;
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static SDL_Joystick *default_joystick = NULL;
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int SDL_JoystickInit(void)
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{
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	int arraylen;
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	int status;
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	SDL_numjoysticks = 0;
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	status = SDL_SYS_JoystickInit();
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	if ( status >= 0 ) {
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		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 ) {
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			SDL_numjoysticks = 0;
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		} else {
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			SDL_memset(SDL_joysticks, 0, arraylen);
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			SDL_numjoysticks = status;
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		}
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		status = 0;
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	}
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	default_joystick = NULL;
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	return(status);
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}
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/*
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 * Count the number of joysticks attached to the system
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 */
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int SDL_NumJoysticks(void)
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{
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	return SDL_numjoysticks;
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}
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/*
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 * Get the implementation dependent name of a joystick
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 */
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const char *SDL_JoystickName(int device_index)
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{
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	if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) {
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		SDL_SetError("There are %d joysticks available",
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		             SDL_numjoysticks);
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		return(NULL);
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	}
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	return(SDL_SYS_JoystickName(device_index));
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}
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/*
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 * Open a joystick for use - the index passed as an argument refers to
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 * the N'th joystick on the system.  This index is the value which will
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 * identify this joystick in future joystick events.
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 *
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 * This function returns a joystick identifier, or NULL if an error occurred.
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 */
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SDL_Joystick *SDL_JoystickOpen(int device_index)
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{
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	int i;
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	SDL_Joystick *joystick;
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	if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) {
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		SDL_SetError("There are %d joysticks available",
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		             SDL_numjoysticks);
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		return(NULL);
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	}
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	/* If the joystick is already open, return it */
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	for ( i=0; SDL_joysticks[i]; ++i ) {
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		if ( device_index == SDL_joysticks[i]->index ) {
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			joystick = SDL_joysticks[i];
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			++joystick->ref_count;
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			return(joystick);
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		}
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	}
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	/* 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;
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		if ( SDL_SYS_JoystickOpen(joystick) < 0 ) {
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			SDL_free(joystick);
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			joystick = NULL;
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		} else {
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			if ( joystick->naxes > 0 ) {
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				joystick->axes = (Sint16 *)SDL_malloc
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					(joystick->naxes*sizeof(Sint16));
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			}
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			if ( joystick->nhats > 0 ) {
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				joystick->hats = (Uint8 *)SDL_malloc
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					(joystick->nhats*sizeof(Uint8));
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			}
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			if ( joystick->nballs > 0 ) {
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				joystick->balls = (struct balldelta *)SDL_malloc
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				  (joystick->nballs*sizeof(*joystick->balls));
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			}
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			if ( joystick->nbuttons > 0 ) {
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				joystick->buttons = (Uint8 *)SDL_malloc
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					(joystick->nbuttons*sizeof(Uint8));
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			}
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			if ( ((joystick->naxes > 0) && !joystick->axes)
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			  || ((joystick->nhats > 0) && !joystick->hats)
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			  || ((joystick->nballs > 0) && !joystick->balls)
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			  || ((joystick->nbuttons > 0) && !joystick->buttons)) {
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				SDL_OutOfMemory();
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				SDL_JoystickClose(joystick);
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				joystick = NULL;
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			}
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			if ( joystick->axes ) {
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				SDL_memset(joystick->axes, 0,
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					joystick->naxes*sizeof(Sint16));
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			}
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			if ( joystick->hats ) {
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				SDL_memset(joystick->hats, 0,
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					joystick->nhats*sizeof(Uint8));
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			}
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			if ( joystick->balls ) {
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				SDL_memset(joystick->balls, 0,
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				  joystick->nballs*sizeof(*joystick->balls));
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			}
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			if ( joystick->buttons ) {
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				SDL_memset(joystick->buttons, 0,
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					joystick->nbuttons*sizeof(Uint8));
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			}
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		}
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	}
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	if ( joystick ) {
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		/* Add joystick to list */
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		++joystick->ref_count;
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		SDL_Lock_EventThread();
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		for ( i=0; SDL_joysticks[i]; ++i )
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			/* Skip to next joystick */;
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		SDL_joysticks[i] = joystick;
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		SDL_Unlock_EventThread();
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	}
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	return(joystick);
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}
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/*
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 * Returns 1 if the joystick has been opened, or 0 if it has not.
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 */
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int SDL_JoystickOpened(int device_index)
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{
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	int i, opened;
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	opened = 0;
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	for ( i=0; SDL_joysticks[i]; ++i ) {
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		if ( SDL_joysticks[i]->index == (Uint8)device_index ) {
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			opened = 1;
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			break;
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		}
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	}
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	return(opened);
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}
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static int ValidJoystick(SDL_Joystick **joystick)
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{
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	int valid;
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	if ( *joystick == NULL ) {
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		*joystick = default_joystick;
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	}
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	if ( *joystick == NULL ) {
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		SDL_SetError("Joystick hasn't been opened yet");
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		valid = 0;
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	} else {
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		valid = 1;
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	}
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	return valid;
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}
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/*
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 * Get the device index of an opened joystick.
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 */
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int SDL_JoystickIndex(SDL_Joystick *joystick)
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{
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	if ( ! ValidJoystick(&joystick) ) {
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		return(-1);
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	}
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	return(joystick->index);
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}
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/*
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 * Get the number of multi-dimensional axis controls on a joystick
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 */
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int SDL_JoystickNumAxes(SDL_Joystick *joystick)
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{
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	if ( ! ValidJoystick(&joystick) ) {
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		return(-1);
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	}
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	return(joystick->naxes);
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}
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/*
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 * Get the number of hats on a joystick
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 */
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int SDL_JoystickNumHats(SDL_Joystick *joystick)
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{
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	if ( ! ValidJoystick(&joystick) ) {
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		return(-1);
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	}
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	return(joystick->nhats);
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}
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/*
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 * Get the number of trackballs on a joystick
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 */
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int SDL_JoystickNumBalls(SDL_Joystick *joystick)
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{
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	if ( ! ValidJoystick(&joystick) ) {
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		return(-1);
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	}
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	return(joystick->nballs);
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}
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/*
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 * Get the number of buttons on a joystick
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 */
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int SDL_JoystickNumButtons(SDL_Joystick *joystick)
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{
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	if ( ! ValidJoystick(&joystick) ) {
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		return(-1);
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	}
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	return(joystick->nbuttons);
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}
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/*
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 * Get the current state of an axis control on a joystick
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 */
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Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis)
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{
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	Sint16 state;
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	if ( ! ValidJoystick(&joystick) ) {
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		return(0);
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	}
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	if ( axis < joystick->naxes ) {
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		state = joystick->axes[axis];
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	} else {
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		SDL_SetError("Joystick only has %d axes", joystick->naxes);
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		state = 0;
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	}
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	return(state);
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}
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/*
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 * Get the current state of a hat on a joystick
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 */
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Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat)
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{
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	Uint8 state;
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	if ( ! ValidJoystick(&joystick) ) {
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		return(0);
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	}
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	if ( hat < joystick->nhats ) {
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		state = joystick->hats[hat];
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	} else {
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		SDL_SetError("Joystick only has %d hats", joystick->nhats);
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		state = 0;
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	}
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	return(state);
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}
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/*
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 * Get the ball axis change since the last poll
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 */
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int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy)
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{
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	int retval;
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	if ( ! ValidJoystick(&joystick) ) {
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		return(-1);
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	}
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	retval = 0;
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	if ( ball < joystick->nballs ) {
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		if ( dx ) {
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			*dx = joystick->balls[ball].dx;
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		}
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		if ( dy ) {
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			*dy = joystick->balls[ball].dy;
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		}
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		joystick->balls[ball].dx = 0;
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		joystick->balls[ball].dy = 0;
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	} else {
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		SDL_SetError("Joystick only has %d balls", joystick->nballs);
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		retval = -1;
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	}
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	return(retval);
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}
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/*
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 * Get the current state of a button on a joystick
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 */
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Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button)
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{
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	Uint8 state;
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	if ( ! ValidJoystick(&joystick) ) {
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		return(0);
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	}
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	if ( button < joystick->nbuttons ) {
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		state = joystick->buttons[button];
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	} else {
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		SDL_SetError("Joystick only has %d buttons",joystick->nbuttons);
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		state = 0;
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	}
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	return(state);
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}
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/*
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 * Close a joystick previously opened with SDL_JoystickOpen()
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 */
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void SDL_JoystickClose(SDL_Joystick *joystick)
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{
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	int i;
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   355
	if ( ! ValidJoystick(&joystick) ) {
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		return;
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	}
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	/* First decrement ref count */
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	if ( --joystick->ref_count > 0 ) {
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		return;
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	}
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	/* Lock the event queue - prevent joystick polling */
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	SDL_Lock_EventThread();
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	if ( joystick == default_joystick ) {
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		default_joystick = NULL;
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	}
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	SDL_SYS_JoystickClose(joystick);
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	/* Remove joystick from list */
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	for ( i=0; SDL_joysticks[i]; ++i ) {
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		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));
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			break;
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		}
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	}
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	/* Let the event thread keep running */
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	SDL_Unlock_EventThread();
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	/* Free the data associated with this joystick */
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	if ( joystick->axes ) {
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		SDL_free(joystick->axes);
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	}
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	if ( joystick->hats ) {
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		SDL_free(joystick->hats);
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   390
	}
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	if ( joystick->balls ) {
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		SDL_free(joystick->balls);
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   393
	}
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   394
	if ( joystick->buttons ) {
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   395
		SDL_free(joystick->buttons);
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   396
	}
slouken@1336
   397
	SDL_free(joystick);
slouken@0
   398
}
slouken@0
   399
slouken@0
   400
void SDL_JoystickQuit(void)
slouken@0
   401
{
slouken@0
   402
	/* Stop the event polling */
slouken@0
   403
	SDL_Lock_EventThread();
slouken@0
   404
	SDL_numjoysticks = 0;
slouken@0
   405
	SDL_Unlock_EventThread();
slouken@0
   406
slouken@0
   407
	/* Quit the joystick setup */
slouken@0
   408
	SDL_SYS_JoystickQuit();
slouken@0
   409
	if ( SDL_joysticks ) {
slouken@1336
   410
		SDL_free(SDL_joysticks);
slouken@0
   411
		SDL_joysticks = NULL;
slouken@0
   412
	}
slouken@0
   413
}
slouken@0
   414
slouken@0
   415
slouken@0
   416
/* These are global for SDL_sysjoystick.c and SDL_events.c */
slouken@0
   417
slouken@0
   418
int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value)
slouken@0
   419
{
slouken@0
   420
	int posted;
slouken@0
   421
slouken@0
   422
	/* Update internal joystick state */
slouken@0
   423
	joystick->axes[axis] = value;
slouken@0
   424
slouken@0
   425
	/* Post the event, if desired */
slouken@0
   426
	posted = 0;
slouken@1361
   427
#if !SDL_EVENTS_DISABLED
slouken@0
   428
	if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) {
slouken@0
   429
		SDL_Event event;
slouken@0
   430
		event.type = SDL_JOYAXISMOTION;
slouken@0
   431
		event.jaxis.which = joystick->index;
slouken@0
   432
		event.jaxis.axis = axis;
slouken@0
   433
		event.jaxis.value = value;
slouken@0
   434
		if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
slouken@0
   435
			posted = 1;
slouken@0
   436
			SDL_PushEvent(&event);
slouken@0
   437
		}
slouken@0
   438
	}
slouken@1361
   439
#endif /* !SDL_EVENTS_DISABLED */
slouken@0
   440
	return(posted);
slouken@0
   441
}
slouken@0
   442
slouken@0
   443
int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value)
slouken@0
   444
{
slouken@0
   445
	int posted;
slouken@0
   446
slouken@0
   447
	/* Update internal joystick state */
slouken@0
   448
	joystick->hats[hat] = value;
slouken@0
   449
slouken@0
   450
	/* Post the event, if desired */
slouken@0
   451
	posted = 0;
slouken@1361
   452
#if !SDL_EVENTS_DISABLED
slouken@0
   453
	if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) {
slouken@0
   454
		SDL_Event event;
slouken@0
   455
		event.jhat.type = SDL_JOYHATMOTION;
slouken@0
   456
		event.jhat.which = joystick->index;
slouken@0
   457
		event.jhat.hat = hat;
slouken@0
   458
		event.jhat.value = value;
slouken@0
   459
		if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
slouken@0
   460
			posted = 1;
slouken@0
   461
			SDL_PushEvent(&event);
slouken@0
   462
		}
slouken@0
   463
	}
slouken@1361
   464
#endif /* !SDL_EVENTS_DISABLED */
slouken@0
   465
	return(posted);
slouken@0
   466
}
slouken@0
   467
slouken@0
   468
int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball,
slouken@0
   469
					Sint16 xrel, Sint16 yrel)
slouken@0
   470
{
slouken@0
   471
	int posted;
slouken@0
   472
slouken@0
   473
	/* Update internal mouse state */
slouken@0
   474
	joystick->balls[ball].dx += xrel;
slouken@0
   475
	joystick->balls[ball].dy += yrel;
slouken@0
   476
slouken@0
   477
	/* Post the event, if desired */
slouken@0
   478
	posted = 0;
slouken@1361
   479
#if !SDL_EVENTS_DISABLED
slouken@0
   480
	if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) {
slouken@0
   481
		SDL_Event event;
slouken@0
   482
		event.jball.type = SDL_JOYBALLMOTION;
slouken@0
   483
		event.jball.which = joystick->index;
slouken@0
   484
		event.jball.ball = ball;
slouken@0
   485
		event.jball.xrel = xrel;
slouken@0
   486
		event.jball.yrel = yrel;
slouken@0
   487
		if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
slouken@0
   488
			posted = 1;
slouken@0
   489
			SDL_PushEvent(&event);
slouken@0
   490
		}
slouken@0
   491
	}
slouken@1361
   492
#endif /* !SDL_EVENTS_DISABLED */
slouken@0
   493
	return(posted);
slouken@0
   494
}
slouken@0
   495
slouken@0
   496
int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state)
slouken@0
   497
{
slouken@0
   498
	int posted;
slouken@1361
   499
#if !SDL_EVENTS_DISABLED
slouken@0
   500
	SDL_Event event;
slouken@0
   501
slouken@0
   502
	switch ( state ) {
slouken@0
   503
		case SDL_PRESSED:
slouken@0
   504
			event.type = SDL_JOYBUTTONDOWN;
slouken@0
   505
			break;
slouken@0
   506
		case SDL_RELEASED:
slouken@0
   507
			event.type = SDL_JOYBUTTONUP;
slouken@0
   508
			break;
slouken@0
   509
		default:
slouken@0
   510
			/* Invalid state -- bail */
slouken@0
   511
			return(0);
slouken@0
   512
	}
slouken@1361
   513
#endif /* !SDL_EVENTS_DISABLED */
slouken@0
   514
slouken@0
   515
	/* Update internal joystick state */
slouken@0
   516
	joystick->buttons[button] = state;
slouken@0
   517
slouken@0
   518
	/* Post the event, if desired */
slouken@0
   519
	posted = 0;
slouken@1361
   520
#if !SDL_EVENTS_DISABLED
slouken@0
   521
	if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) {
slouken@0
   522
		event.jbutton.which = joystick->index;
slouken@0
   523
		event.jbutton.button = button;
slouken@0
   524
		event.jbutton.state = state;
slouken@0
   525
		if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
slouken@0
   526
			posted = 1;
slouken@0
   527
			SDL_PushEvent(&event);
slouken@0
   528
		}
slouken@0
   529
	}
slouken@1361
   530
#endif /* !SDL_EVENTS_DISABLED */
slouken@0
   531
	return(posted);
slouken@0
   532
}
slouken@0
   533
slouken@0
   534
void SDL_JoystickUpdate(void)
slouken@0
   535
{
slouken@0
   536
	int i;
slouken@0
   537
slouken@0
   538
	for ( i=0; SDL_joysticks[i]; ++i ) {
slouken@0
   539
		SDL_SYS_JoystickUpdate(SDL_joysticks[i]);
slouken@0
   540
	}
slouken@0
   541
}
slouken@0
   542
slouken@0
   543
int SDL_JoystickEventState(int state)
slouken@0
   544
{
slouken@1361
   545
#if SDL_EVENTS_DISABLED
slouken@0
   546
	return SDL_IGNORE;
slouken@0
   547
#else
slouken@0
   548
	const Uint8 event_list[] = {
slouken@0
   549
		SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION,
slouken@0
   550
		SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP,
slouken@0
   551
	};
slouken@0
   552
	int i;
slouken@0
   553
slouken@0
   554
	switch (state) {
slouken@0
   555
		case SDL_QUERY:
slouken@0
   556
			state = SDL_IGNORE;
slouken@0
   557
			for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) {
slouken@0
   558
				state = SDL_EventState(event_list[i],SDL_QUERY);
slouken@0
   559
				if ( state == SDL_ENABLE ) {
slouken@0
   560
					break;
slouken@0
   561
				}
slouken@0
   562
			}
slouken@0
   563
			break;
slouken@0
   564
		default:
slouken@0
   565
			for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) {
slouken@0
   566
				SDL_EventState(event_list[i], state);
slouken@0
   567
			}
slouken@0
   568
			break;
slouken@0
   569
	}
slouken@0
   570
	return(state);
slouken@1361
   571
#endif /* SDL_EVENTS_DISABLED */
slouken@0
   572
}