src/events/SDL_events.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 13 Jan 2005 23:24:56 +0000
changeset 1028 5ba65305c954
parent 769 b8d311d90021
child 1123 28ac87a38c17
permissions -rw-r--r--
Fix various problems with the timer code. * SDL_timer_running wasn't always updated correctly. * Fixed occasional crash in SDL_SetTimer() when clearing threaded timers * It was possible to get both the timer thread and event thread running * Other misc. cleanup
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 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 Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 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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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/* General event handling code for SDL */
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#include <stdio.h>
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#include <string.h>
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#include "SDL.h"
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#include "SDL_thread.h"
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#include "SDL_mutex.h"
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#include "SDL_events.h"
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#include "SDL_events_c.h"
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#include "SDL_timer_c.h"
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#ifndef DISABLE_JOYSTICK
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#include "SDL_joystick_c.h"
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#endif
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#ifndef ENABLE_X11
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#define DISABLE_X11
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#endif
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#include "SDL_syswm.h"
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#include "SDL_sysevents.h"
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/* Public data -- the event filter */
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SDL_EventFilter SDL_EventOK = NULL;
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Uint8 SDL_ProcessEvents[SDL_NUMEVENTS];
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static Uint32 SDL_eventstate = 0;
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/* Private data -- event queue */
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#define MAXEVENTS	128
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static struct {
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	SDL_mutex *lock;
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	int active;
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	int head;
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	int tail;
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	SDL_Event event[MAXEVENTS];
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	int wmmsg_next;
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	struct SDL_SysWMmsg wmmsg[MAXEVENTS];
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} SDL_EventQ;
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/* Private data -- event locking structure */
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static struct {
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	SDL_mutex *lock;
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	int safe;
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} SDL_EventLock;
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/* Thread functions */
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static SDL_Thread *SDL_EventThread = NULL;	/* Thread handle */
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static Uint32 event_thread;			/* The event thread id */
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void SDL_Lock_EventThread(void)
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{
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	if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) {
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		/* Grab lock and spin until we're sure event thread stopped */
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		SDL_mutexP(SDL_EventLock.lock);
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		while ( ! SDL_EventLock.safe ) {
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			SDL_Delay(1);
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		}
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	}
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}
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void SDL_Unlock_EventThread(void)
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{
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	if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) {
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		SDL_mutexV(SDL_EventLock.lock);
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	}
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}
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static int SDL_GobbleEvents(void *unused)
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{
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	event_thread = SDL_ThreadID();
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	while ( SDL_EventQ.active ) {
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		SDL_VideoDevice *video = current_video;
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		SDL_VideoDevice *this  = current_video;
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		/* Get events from the video subsystem */
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		if ( video ) {
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			video->PumpEvents(this);
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		}
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		/* Queue pending key-repeat events */
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		SDL_CheckKeyRepeat();
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#ifndef DISABLE_JOYSTICK
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		/* Check for joystick state change */
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		if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) {
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			SDL_JoystickUpdate();
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		}
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#endif
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		/* Give up the CPU for the rest of our timeslice */
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		SDL_EventLock.safe = 1;
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		if ( SDL_timer_running ) {
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			SDL_ThreadedTimerCheck();
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		}
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		SDL_Delay(1);
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		/* Check for event locking.
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		   On the P of the lock mutex, if the lock is held, this thread
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		   will wait until the lock is released before continuing.  The
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		   safe flag will be set, meaning that the other thread can go
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		   about it's business.  The safe flag is reset before the V,
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		   so as soon as the mutex is free, other threads can see that
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		   it's not safe to interfere with the event thread.
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		 */
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		SDL_mutexP(SDL_EventLock.lock);
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		SDL_EventLock.safe = 0;
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		SDL_mutexV(SDL_EventLock.lock);
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	}
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	SDL_SetTimerThreaded(0);
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	event_thread = 0;
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	return(0);
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}
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static int SDL_StartEventThread(Uint32 flags)
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{
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	/* Reset everything to zero */
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	SDL_EventThread = NULL;
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	memset(&SDL_EventLock, 0, sizeof(SDL_EventLock));
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	/* Create the lock and set ourselves active */
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#ifndef DISABLE_THREADS
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	SDL_EventQ.lock = SDL_CreateMutex();
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	if ( SDL_EventQ.lock == NULL ) {
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#ifdef macintosh /* On MacOS 7/8, you can't multithread, so no lock needed */
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		;
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#else
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		return(-1);
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#endif
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	}
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#endif /* !DISABLE_THREADS */
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	SDL_EventQ.active = 1;
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	if ( (flags&SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) {
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		SDL_EventLock.lock = SDL_CreateMutex();
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		if ( SDL_EventLock.lock == NULL ) {
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			return(-1);
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		}
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		SDL_EventLock.safe = 0;
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		/* The event thread will handle timers too */
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		SDL_SetTimerThreaded(2);
0
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		SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL);
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		if ( SDL_EventThread == NULL ) {
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			return(-1);
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		}
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	} else {
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		event_thread = 0;
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	}
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	return(0);
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}
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static void SDL_StopEventThread(void)
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{
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	SDL_EventQ.active = 0;
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	if ( SDL_EventThread ) {
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		SDL_WaitThread(SDL_EventThread, NULL);
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		SDL_EventThread = NULL;
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		SDL_DestroyMutex(SDL_EventLock.lock);
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	}
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	SDL_DestroyMutex(SDL_EventQ.lock);
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}
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Uint32 SDL_EventThreadID(void)
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{
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	return(event_thread);
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}
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/* Public functions */
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void SDL_StopEventLoop(void)
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{
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	/* Halt the event thread, if running */
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	SDL_StopEventThread();
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	/* Clean out EventQ */
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	SDL_EventQ.head = 0;
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	SDL_EventQ.tail = 0;
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	SDL_EventQ.wmmsg_next = 0;
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}
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/* This function (and associated calls) may be called more than once */
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int SDL_StartEventLoop(Uint32 flags)
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{
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	int retcode;
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	/* Clean out the event queue */
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	SDL_EventThread = NULL;
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	SDL_EventQ.lock = NULL;
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	SDL_StopEventLoop();
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	/* No filter to start with, process most event types */
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	SDL_EventOK = NULL;
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	memset(SDL_ProcessEvents,SDL_ENABLE,sizeof(SDL_ProcessEvents));
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	SDL_eventstate = ~0;
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	/* It's not save to call SDL_EventState() yet */
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	SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT);
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	SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE;
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	/* Initialize event handlers */
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	retcode = 0;
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	retcode += SDL_AppActiveInit();
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	retcode += SDL_KeyboardInit();
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	retcode += SDL_MouseInit();
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	retcode += SDL_QuitInit();
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	if ( retcode < 0 ) {
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		/* We don't expect them to fail, but... */
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		return(-1);
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	}
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	/* Create the lock and event thread */
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	if ( SDL_StartEventThread(flags) < 0 ) {
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		SDL_StopEventLoop();
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		return(-1);
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	}
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	return(0);
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}
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/* Add an event to the event queue -- called with the queue locked */
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static int SDL_AddEvent(SDL_Event *event)
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{
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	int tail, added;
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	tail = (SDL_EventQ.tail+1)%MAXEVENTS;
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	if ( tail == SDL_EventQ.head ) {
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		/* Overflow, drop event */
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		added = 0;
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	} else {
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		SDL_EventQ.event[SDL_EventQ.tail] = *event;
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		if (event->type == SDL_SYSWMEVENT) {
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			/* Note that it's possible to lose an event */
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			int next = SDL_EventQ.wmmsg_next;
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			SDL_EventQ.wmmsg[next] = *event->syswm.msg;
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		        SDL_EventQ.event[SDL_EventQ.tail].syswm.msg =
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						&SDL_EventQ.wmmsg[next];
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			SDL_EventQ.wmmsg_next = (next+1)%MAXEVENTS;
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   261
		}
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		SDL_EventQ.tail = tail;
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		added = 1;
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   264
	}
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	return(added);
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   266
}
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/* Cut an event, and return the next valid spot, or the tail */
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/*                           -- called with the queue locked */
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static int SDL_CutEvent(int spot)
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   271
{
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	if ( spot == SDL_EventQ.head ) {
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		SDL_EventQ.head = (SDL_EventQ.head+1)%MAXEVENTS;
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		return(SDL_EventQ.head);
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	} else
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	if ( (spot+1)%MAXEVENTS == SDL_EventQ.tail ) {
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		SDL_EventQ.tail = spot;
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		return(SDL_EventQ.tail);
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   279
	} else
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	/* We cut the middle -- shift everything over */
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   281
	{
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   282
		int here, next;
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   283
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   284
		/* This can probably be optimized with memcpy() -- careful! */
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   285
		if ( --SDL_EventQ.tail < 0 ) {
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   286
			SDL_EventQ.tail = MAXEVENTS-1;
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   287
		}
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   288
		for ( here=spot; here != SDL_EventQ.tail; here = next ) {
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   289
			next = (here+1)%MAXEVENTS;
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   290
			SDL_EventQ.event[here] = SDL_EventQ.event[next];
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   291
		}
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   292
		return(spot);
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   293
	}
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   294
	/* NOTREACHED */
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   295
}
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/* Lock the event queue, take a peep at it, and unlock it */
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int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action,
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   299
								Uint32 mask)
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   300
{
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	int i, used;
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   303
	/* Don't look after we've quit */
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   304
	if ( ! SDL_EventQ.active ) {
276
8af85680ca0a Updated the documentation for the SDL_PushEvent() call.
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   305
		return(-1);
0
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   306
	}
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   307
	/* Lock the event queue */
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   308
	used = 0;
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   309
	if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) {
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   310
		if ( action == SDL_ADDEVENT ) {
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   311
			for ( i=0; i<numevents; ++i ) {
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   312
				used += SDL_AddEvent(&events[i]);
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   313
			}
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   314
		} else {
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			SDL_Event tmpevent;
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   316
			int spot;
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diff changeset
   317
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parents:
diff changeset
   318
			/* If 'events' is NULL, just see if they exist */
74212992fb08 Initial revision
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parents:
diff changeset
   319
			if ( events == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   320
				action = SDL_PEEKEVENT;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   321
				numevents = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   322
				events = &tmpevent;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   323
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   324
			spot = SDL_EventQ.head;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   325
			while ((used < numevents)&&(spot != SDL_EventQ.tail)) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   326
				if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   327
					events[used++] = SDL_EventQ.event[spot];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   328
					if ( action == SDL_GETEVENT ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   329
						spot = SDL_CutEvent(spot);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   330
					} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   331
						spot = (spot+1)%MAXEVENTS;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   332
					}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   333
				} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   334
					spot = (spot+1)%MAXEVENTS;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   335
				}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   336
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   337
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   338
		SDL_mutexV(SDL_EventQ.lock);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   339
	} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   340
		SDL_SetError("Couldn't lock event queue");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   341
		used = -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   342
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   343
	return(used);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   344
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   345
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   346
/* Run the system dependent event loops */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   347
void SDL_PumpEvents(void)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   348
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   349
	if ( !SDL_EventThread ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   350
		SDL_VideoDevice *video = current_video;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   351
		SDL_VideoDevice *this  = current_video;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   352
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   353
		/* Get events from the video subsystem */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   354
		if ( video ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   355
			video->PumpEvents(this);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   356
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   357
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   358
		/* Queue pending key-repeat events */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   359
		SDL_CheckKeyRepeat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   360
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   361
#ifndef DISABLE_JOYSTICK
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   362
		/* Check for joystick state change */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   363
		if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   364
			SDL_JoystickUpdate();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   365
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   366
#endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   367
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   368
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   369
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   370
/* Public functions */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   371
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   372
int SDL_PollEvent (SDL_Event *event)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   373
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   374
	SDL_PumpEvents();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   375
352
b49fc922e7f6 Fixed SDL_PollEvent() so it only returns a boolean value (not -1)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   376
	/* We can't return -1, just return 0 (no event) on error */
b49fc922e7f6 Fixed SDL_PollEvent() so it only returns a boolean value (not -1)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   377
	if ( SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0 )
b49fc922e7f6 Fixed SDL_PollEvent() so it only returns a boolean value (not -1)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   378
		return 0;
b49fc922e7f6 Fixed SDL_PollEvent() so it only returns a boolean value (not -1)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   379
	return 1;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   380
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   381
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   382
int SDL_WaitEvent (SDL_Event *event)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   383
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   384
	while ( 1 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   385
		SDL_PumpEvents();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   386
		switch(SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) {
353
d47637068e52 The documented error return value for SDL_WaitEvent() is 0.
Sam Lantinga <slouken@libsdl.org>
parents: 352
diff changeset
   387
		    case -1: return 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   388
		    case 1: return 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   389
		    case 0: SDL_Delay(10);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   390
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   391
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   392
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   393
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   394
int SDL_PushEvent(SDL_Event *event)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   395
{
384
1870bb49ab18 Almost... :)
Sam Lantinga <slouken@libsdl.org>
parents: 383
diff changeset
   396
	if ( SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0 )
1870bb49ab18 Almost... :)
Sam Lantinga <slouken@libsdl.org>
parents: 383
diff changeset
   397
		return -1;
1870bb49ab18 Almost... :)
Sam Lantinga <slouken@libsdl.org>
parents: 383
diff changeset
   398
	return 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   399
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   400
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   401
void SDL_SetEventFilter (SDL_EventFilter filter)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   402
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   403
	SDL_Event bitbucket;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   404
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   405
	/* Set filter and discard pending events */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   406
	SDL_EventOK = filter;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   407
	while ( SDL_PollEvent(&bitbucket) > 0 )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   408
		;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   409
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   410
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   411
SDL_EventFilter SDL_GetEventFilter(void)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   412
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   413
	return(SDL_EventOK);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   414
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   415
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   416
Uint8 SDL_EventState (Uint8 type, int state)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   417
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   418
	SDL_Event bitbucket;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   419
	Uint8 current_state;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   420
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   421
	/* If SDL_ALLEVENTS was specified... */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   422
	if ( type == 0xFF ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   423
		current_state = SDL_IGNORE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   424
		for ( type=0; type<SDL_NUMEVENTS; ++type ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   425
			if ( SDL_ProcessEvents[type] != SDL_IGNORE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   426
				current_state = SDL_ENABLE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   427
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   428
			SDL_ProcessEvents[type] = state;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   429
			if ( state == SDL_ENABLE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   430
				SDL_eventstate |= (0x00000001 << (type));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   431
			} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   432
				SDL_eventstate &= ~(0x00000001 << (type));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   433
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   434
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   435
		while ( SDL_PollEvent(&bitbucket) > 0 )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   436
			;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   437
		return(current_state);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   438
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   439
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   440
	/* Just set the state for one event type */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   441
	current_state = SDL_ProcessEvents[type];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   442
	switch (state) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   443
		case SDL_IGNORE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   444
		case SDL_ENABLE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   445
			/* Set state and discard pending events */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   446
			SDL_ProcessEvents[type] = state;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   447
			if ( state == SDL_ENABLE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   448
				SDL_eventstate |= (0x00000001 << (type));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   449
			} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   450
				SDL_eventstate &= ~(0x00000001 << (type));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   451
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   452
			while ( SDL_PollEvent(&bitbucket) > 0 )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   453
				;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   454
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   455
		default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   456
			/* Querying state? */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   457
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   458
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   459
	return(current_state);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   460
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   461
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   462
/* This is a generic event handler.
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   463
 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   464
int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   465
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   466
	int posted;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   467
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   468
	posted = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   469
	if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   470
		SDL_Event event;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   471
		memset(&event, 0, sizeof(event));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   472
		event.type = SDL_SYSWMEVENT;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   473
		event.syswm.msg = message;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   474
		if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   475
			posted = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   476
			SDL_PushEvent(&event);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   477
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   478
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   479
	/* Update internal event state */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   480
	return(posted);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   481
}