src/joystick/SDL_joystick.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 06 May 2004 15:55:06 +0000
changeset 886 05c551e5bc64
parent 769 b8d311d90021
child 1312 c9b51268668f
permissions -rw-r--r--
Date: Sat, 24 Apr 2004 15:13:32 +0300 From: "Mike Gorchak" Subject: SDL updates for the QNX6 1. Updated the README.QNX 2. Updated libtool scripts, which are shipped with SDL for QNX6 support. 3. Added some code to support the new QNX 6.3.0, which is in beta now. 4. Added code to detect the hw features, which driver supports. 5. Added hw alpha blits code. 6. Fixed bug when application switches to fullscreen more the 2 times. (afte\ r that window becames always stay on top). 7. Updated a bit README for the tests. 8. Added information about acceleration show in the testalpha.c test. 9. Added small fixes to the testoverlay2.c test. 10. Added alpha and cc+alpha blits benchmarks to the testvidinfo.c test.

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

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

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL_error.h"
#include "SDL_events.h"
#ifndef DISABLE_EVENTS
#include "SDL_events_c.h"
#endif
#include "SDL_joystick_c.h"
#include "SDL_sysjoystick.h"

/* This is used for Quake III Arena */
#ifdef DISABLE_EVENTS
#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 **)malloc(arraylen);
		if ( SDL_joysticks == NULL ) {
			SDL_numjoysticks = 0;
		} else {
			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 *)malloc((sizeof *joystick));
	if ( joystick != NULL ) {
		memset(joystick, 0, (sizeof *joystick));
		joystick->index = device_index;
		if ( SDL_SYS_JoystickOpen(joystick) < 0 ) {
			free(joystick);
			joystick = NULL;
		} else {
			if ( joystick->naxes > 0 ) {
				joystick->axes = (Sint16 *)malloc
					(joystick->naxes*sizeof(Sint16));
			}
			if ( joystick->nhats > 0 ) {
				joystick->hats = (Uint8 *)malloc
					(joystick->nhats*sizeof(Uint8));
			}
			if ( joystick->nballs > 0 ) {
				joystick->balls = (struct balldelta *)malloc
				  (joystick->nballs*sizeof(*joystick->balls));
			}
			if ( joystick->nbuttons > 0 ) {
				joystick->buttons = (Uint8 *)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 ) {
				memset(joystick->axes, 0,
					joystick->naxes*sizeof(Sint16));
			}
			if ( joystick->hats ) {
				memset(joystick->hats, 0,
					joystick->nhats*sizeof(Uint8));
			}
			if ( joystick->balls ) {
				memset(joystick->balls, 0,
				  joystick->nballs*sizeof(*joystick->balls));
			}
			if ( joystick->buttons ) {
				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] ) {
			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 ) {
		free(joystick->axes);
	}
	if ( joystick->hats ) {
		free(joystick->hats);
	}
	if ( joystick->balls ) {
		free(joystick->balls);
	}
	if ( joystick->buttons ) {
		free(joystick->buttons);
	}
	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 ) {
		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;
#ifndef DISABLE_EVENTS
	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 /* !DISABLE_EVENTS */
	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;
#ifndef DISABLE_EVENTS
	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 /* !DISABLE_EVENTS */
	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;
#ifndef DISABLE_EVENTS
	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 /* !DISABLE_EVENTS */
	return(posted);
}

int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state)
{
	int posted;
#ifndef DISABLE_EVENTS
	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 /* !DISABLE_EVENTS */

	/* Update internal joystick state */
	joystick->buttons[button] = state;

	/* Post the event, if desired */
	posted = 0;
#ifndef DISABLE_EVENTS
	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 /* !DISABLE_EVENTS */
	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)
{
#ifdef DISABLE_EVENTS
	return SDL_IGNORE;
#else
	const Uint8 event_list[] = {
		SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION,
		SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP,
	};
	int i;

	switch (state) {
		case SDL_QUERY:
			state = SDL_IGNORE;
			for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) {
				state = SDL_EventState(event_list[i],SDL_QUERY);
				if ( state == SDL_ENABLE ) {
					break;
				}
			}
			break;
		default:
			for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) {
				SDL_EventState(event_list[i], state);
			}
			break;
	}
	return(state);
#endif /* DISABLE_EVENTS */
}