slouken@0
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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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/* General event handling code for SDL */
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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_string.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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#ifdef __OS2__
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/*
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* We'll increase the priority of GobbleEvents thread, so it will process
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* events in time for sure! For this, we need the DosSetPriority() API
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* from the os2.h include file.
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*/
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#define INCL_DOSPROCESS
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#include <os2.h>
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#include <time.h>
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#endif
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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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#ifdef __OS2__
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#ifdef USE_DOSSETPRIORITY
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/* Increase thread priority, so it will process events in time for sure! */
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DosSetPriority(PRTYS_THREAD, PRTYC_REGULAR, +16, 0);
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#endif
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#endif
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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);
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#if (defined(_WIN32) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
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#undef SDL_CreateThread
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SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL, NULL, NULL);
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#else
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SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL);
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#endif
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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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#ifndef IPOD
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SDL_DestroyMutex(SDL_EventQ.lock);
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#endif
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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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/* Shutdown event handlers */
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SDL_AppActiveQuit();
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SDL_KeyboardQuit();
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SDL_MouseQuit();
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SDL_QuitQuit();
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slouken@0
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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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slouken@0
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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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slouken@0
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slouken@0
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/* Clean out the event queue */
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slouken@0
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SDL_EventThread = NULL;
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237 |
SDL_EventQ.lock = NULL;
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slouken@0
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SDL_StopEventLoop();
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slouken@0
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slouken@0
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240 |
/* No filter to start with, process most event types */
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slouken@0
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SDL_EventOK = NULL;
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slouken@0
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242 |
memset(SDL_ProcessEvents,SDL_ENABLE,sizeof(SDL_ProcessEvents));
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slouken@0
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243 |
SDL_eventstate = ~0;
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slouken@0
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244 |
/* It's not save to call SDL_EventState() yet */
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slouken@0
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SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT);
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slouken@0
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SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE;
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slouken@0
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247 |
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slouken@0
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248 |
/* Initialize event handlers */
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slouken@0
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249 |
retcode = 0;
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slouken@0
|
250 |
retcode += SDL_AppActiveInit();
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slouken@0
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251 |
retcode += SDL_KeyboardInit();
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slouken@0
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252 |
retcode += SDL_MouseInit();
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slouken@0
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253 |
retcode += SDL_QuitInit();
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slouken@0
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254 |
if ( retcode < 0 ) {
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slouken@0
|
255 |
/* We don't expect them to fail, but... */
|
slouken@0
|
256 |
return(-1);
|
slouken@0
|
257 |
}
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slouken@0
|
258 |
|
slouken@0
|
259 |
/* Create the lock and event thread */
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slouken@0
|
260 |
if ( SDL_StartEventThread(flags) < 0 ) {
|
slouken@0
|
261 |
SDL_StopEventLoop();
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slouken@0
|
262 |
return(-1);
|
slouken@0
|
263 |
}
|
slouken@0
|
264 |
return(0);
|
slouken@0
|
265 |
}
|
slouken@0
|
266 |
|
slouken@0
|
267 |
|
slouken@0
|
268 |
/* Add an event to the event queue -- called with the queue locked */
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slouken@0
|
269 |
static int SDL_AddEvent(SDL_Event *event)
|
slouken@0
|
270 |
{
|
slouken@0
|
271 |
int tail, added;
|
slouken@0
|
272 |
|
slouken@0
|
273 |
tail = (SDL_EventQ.tail+1)%MAXEVENTS;
|
slouken@0
|
274 |
if ( tail == SDL_EventQ.head ) {
|
slouken@0
|
275 |
/* Overflow, drop event */
|
slouken@0
|
276 |
added = 0;
|
slouken@0
|
277 |
} else {
|
slouken@0
|
278 |
SDL_EventQ.event[SDL_EventQ.tail] = *event;
|
slouken@0
|
279 |
if (event->type == SDL_SYSWMEVENT) {
|
slouken@0
|
280 |
/* Note that it's possible to lose an event */
|
slouken@0
|
281 |
int next = SDL_EventQ.wmmsg_next;
|
slouken@0
|
282 |
SDL_EventQ.wmmsg[next] = *event->syswm.msg;
|
slouken@0
|
283 |
SDL_EventQ.event[SDL_EventQ.tail].syswm.msg =
|
slouken@0
|
284 |
&SDL_EventQ.wmmsg[next];
|
slouken@0
|
285 |
SDL_EventQ.wmmsg_next = (next+1)%MAXEVENTS;
|
slouken@0
|
286 |
}
|
slouken@0
|
287 |
SDL_EventQ.tail = tail;
|
slouken@0
|
288 |
added = 1;
|
slouken@0
|
289 |
}
|
slouken@0
|
290 |
return(added);
|
slouken@0
|
291 |
}
|
slouken@0
|
292 |
|
slouken@0
|
293 |
/* Cut an event, and return the next valid spot, or the tail */
|
slouken@0
|
294 |
/* -- called with the queue locked */
|
slouken@0
|
295 |
static int SDL_CutEvent(int spot)
|
slouken@0
|
296 |
{
|
slouken@0
|
297 |
if ( spot == SDL_EventQ.head ) {
|
slouken@0
|
298 |
SDL_EventQ.head = (SDL_EventQ.head+1)%MAXEVENTS;
|
slouken@0
|
299 |
return(SDL_EventQ.head);
|
slouken@0
|
300 |
} else
|
slouken@0
|
301 |
if ( (spot+1)%MAXEVENTS == SDL_EventQ.tail ) {
|
slouken@0
|
302 |
SDL_EventQ.tail = spot;
|
slouken@0
|
303 |
return(SDL_EventQ.tail);
|
slouken@0
|
304 |
} else
|
slouken@0
|
305 |
/* We cut the middle -- shift everything over */
|
slouken@0
|
306 |
{
|
slouken@0
|
307 |
int here, next;
|
slouken@0
|
308 |
|
slouken@0
|
309 |
/* This can probably be optimized with memcpy() -- careful! */
|
slouken@0
|
310 |
if ( --SDL_EventQ.tail < 0 ) {
|
slouken@0
|
311 |
SDL_EventQ.tail = MAXEVENTS-1;
|
slouken@0
|
312 |
}
|
slouken@0
|
313 |
for ( here=spot; here != SDL_EventQ.tail; here = next ) {
|
slouken@0
|
314 |
next = (here+1)%MAXEVENTS;
|
slouken@0
|
315 |
SDL_EventQ.event[here] = SDL_EventQ.event[next];
|
slouken@0
|
316 |
}
|
slouken@0
|
317 |
return(spot);
|
slouken@0
|
318 |
}
|
slouken@0
|
319 |
/* NOTREACHED */
|
slouken@0
|
320 |
}
|
slouken@0
|
321 |
|
slouken@0
|
322 |
/* Lock the event queue, take a peep at it, and unlock it */
|
slouken@0
|
323 |
int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action,
|
slouken@0
|
324 |
Uint32 mask)
|
slouken@0
|
325 |
{
|
slouken@0
|
326 |
int i, used;
|
slouken@0
|
327 |
|
slouken@0
|
328 |
/* Don't look after we've quit */
|
slouken@0
|
329 |
if ( ! SDL_EventQ.active ) {
|
slouken@276
|
330 |
return(-1);
|
slouken@0
|
331 |
}
|
slouken@0
|
332 |
/* Lock the event queue */
|
slouken@0
|
333 |
used = 0;
|
slouken@0
|
334 |
if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) {
|
slouken@0
|
335 |
if ( action == SDL_ADDEVENT ) {
|
slouken@0
|
336 |
for ( i=0; i<numevents; ++i ) {
|
slouken@0
|
337 |
used += SDL_AddEvent(&events[i]);
|
slouken@0
|
338 |
}
|
slouken@0
|
339 |
} else {
|
slouken@0
|
340 |
SDL_Event tmpevent;
|
slouken@0
|
341 |
int spot;
|
slouken@0
|
342 |
|
slouken@0
|
343 |
/* If 'events' is NULL, just see if they exist */
|
slouken@0
|
344 |
if ( events == NULL ) {
|
slouken@0
|
345 |
action = SDL_PEEKEVENT;
|
slouken@0
|
346 |
numevents = 1;
|
slouken@0
|
347 |
events = &tmpevent;
|
slouken@0
|
348 |
}
|
slouken@0
|
349 |
spot = SDL_EventQ.head;
|
slouken@0
|
350 |
while ((used < numevents)&&(spot != SDL_EventQ.tail)) {
|
slouken@0
|
351 |
if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) {
|
slouken@0
|
352 |
events[used++] = SDL_EventQ.event[spot];
|
slouken@0
|
353 |
if ( action == SDL_GETEVENT ) {
|
slouken@0
|
354 |
spot = SDL_CutEvent(spot);
|
slouken@0
|
355 |
} else {
|
slouken@0
|
356 |
spot = (spot+1)%MAXEVENTS;
|
slouken@0
|
357 |
}
|
slouken@0
|
358 |
} else {
|
slouken@0
|
359 |
spot = (spot+1)%MAXEVENTS;
|
slouken@0
|
360 |
}
|
slouken@0
|
361 |
}
|
slouken@0
|
362 |
}
|
slouken@0
|
363 |
SDL_mutexV(SDL_EventQ.lock);
|
slouken@0
|
364 |
} else {
|
slouken@0
|
365 |
SDL_SetError("Couldn't lock event queue");
|
slouken@0
|
366 |
used = -1;
|
slouken@0
|
367 |
}
|
slouken@0
|
368 |
return(used);
|
slouken@0
|
369 |
}
|
slouken@0
|
370 |
|
slouken@0
|
371 |
/* Run the system dependent event loops */
|
slouken@0
|
372 |
void SDL_PumpEvents(void)
|
slouken@0
|
373 |
{
|
slouken@0
|
374 |
if ( !SDL_EventThread ) {
|
slouken@0
|
375 |
SDL_VideoDevice *video = current_video;
|
slouken@0
|
376 |
SDL_VideoDevice *this = current_video;
|
slouken@0
|
377 |
|
slouken@0
|
378 |
/* Get events from the video subsystem */
|
slouken@0
|
379 |
if ( video ) {
|
slouken@0
|
380 |
video->PumpEvents(this);
|
slouken@0
|
381 |
}
|
slouken@0
|
382 |
|
slouken@0
|
383 |
/* Queue pending key-repeat events */
|
slouken@0
|
384 |
SDL_CheckKeyRepeat();
|
slouken@0
|
385 |
|
slouken@0
|
386 |
#ifndef DISABLE_JOYSTICK
|
slouken@0
|
387 |
/* Check for joystick state change */
|
slouken@0
|
388 |
if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) {
|
slouken@0
|
389 |
SDL_JoystickUpdate();
|
slouken@0
|
390 |
}
|
slouken@0
|
391 |
#endif
|
slouken@0
|
392 |
}
|
slouken@0
|
393 |
}
|
slouken@0
|
394 |
|
slouken@0
|
395 |
/* Public functions */
|
slouken@0
|
396 |
|
slouken@0
|
397 |
int SDL_PollEvent (SDL_Event *event)
|
slouken@0
|
398 |
{
|
slouken@0
|
399 |
SDL_PumpEvents();
|
slouken@0
|
400 |
|
slouken@352
|
401 |
/* We can't return -1, just return 0 (no event) on error */
|
slouken@352
|
402 |
if ( SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0 )
|
slouken@352
|
403 |
return 0;
|
slouken@352
|
404 |
return 1;
|
slouken@0
|
405 |
}
|
slouken@0
|
406 |
|
slouken@0
|
407 |
int SDL_WaitEvent (SDL_Event *event)
|
slouken@0
|
408 |
{
|
slouken@0
|
409 |
while ( 1 ) {
|
slouken@0
|
410 |
SDL_PumpEvents();
|
slouken@0
|
411 |
switch(SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) {
|
slouken@353
|
412 |
case -1: return 0;
|
slouken@0
|
413 |
case 1: return 1;
|
slouken@0
|
414 |
case 0: SDL_Delay(10);
|
slouken@0
|
415 |
}
|
slouken@0
|
416 |
}
|
slouken@0
|
417 |
}
|
slouken@0
|
418 |
|
slouken@0
|
419 |
int SDL_PushEvent(SDL_Event *event)
|
slouken@0
|
420 |
{
|
slouken@384
|
421 |
if ( SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0 )
|
slouken@384
|
422 |
return -1;
|
slouken@384
|
423 |
return 0;
|
slouken@0
|
424 |
}
|
slouken@0
|
425 |
|
slouken@0
|
426 |
void SDL_SetEventFilter (SDL_EventFilter filter)
|
slouken@0
|
427 |
{
|
slouken@0
|
428 |
SDL_Event bitbucket;
|
slouken@0
|
429 |
|
slouken@0
|
430 |
/* Set filter and discard pending events */
|
slouken@0
|
431 |
SDL_EventOK = filter;
|
slouken@0
|
432 |
while ( SDL_PollEvent(&bitbucket) > 0 )
|
slouken@0
|
433 |
;
|
slouken@0
|
434 |
}
|
slouken@0
|
435 |
|
slouken@0
|
436 |
SDL_EventFilter SDL_GetEventFilter(void)
|
slouken@0
|
437 |
{
|
slouken@0
|
438 |
return(SDL_EventOK);
|
slouken@0
|
439 |
}
|
slouken@0
|
440 |
|
slouken@0
|
441 |
Uint8 SDL_EventState (Uint8 type, int state)
|
slouken@0
|
442 |
{
|
slouken@0
|
443 |
SDL_Event bitbucket;
|
slouken@0
|
444 |
Uint8 current_state;
|
slouken@0
|
445 |
|
slouken@0
|
446 |
/* If SDL_ALLEVENTS was specified... */
|
slouken@0
|
447 |
if ( type == 0xFF ) {
|
slouken@0
|
448 |
current_state = SDL_IGNORE;
|
slouken@0
|
449 |
for ( type=0; type<SDL_NUMEVENTS; ++type ) {
|
slouken@0
|
450 |
if ( SDL_ProcessEvents[type] != SDL_IGNORE ) {
|
slouken@0
|
451 |
current_state = SDL_ENABLE;
|
slouken@0
|
452 |
}
|
slouken@0
|
453 |
SDL_ProcessEvents[type] = state;
|
slouken@0
|
454 |
if ( state == SDL_ENABLE ) {
|
slouken@0
|
455 |
SDL_eventstate |= (0x00000001 << (type));
|
slouken@0
|
456 |
} else {
|
slouken@0
|
457 |
SDL_eventstate &= ~(0x00000001 << (type));
|
slouken@0
|
458 |
}
|
slouken@0
|
459 |
}
|
slouken@0
|
460 |
while ( SDL_PollEvent(&bitbucket) > 0 )
|
slouken@0
|
461 |
;
|
slouken@0
|
462 |
return(current_state);
|
slouken@0
|
463 |
}
|
slouken@0
|
464 |
|
slouken@0
|
465 |
/* Just set the state for one event type */
|
slouken@0
|
466 |
current_state = SDL_ProcessEvents[type];
|
slouken@0
|
467 |
switch (state) {
|
slouken@0
|
468 |
case SDL_IGNORE:
|
slouken@0
|
469 |
case SDL_ENABLE:
|
slouken@0
|
470 |
/* Set state and discard pending events */
|
slouken@0
|
471 |
SDL_ProcessEvents[type] = state;
|
slouken@0
|
472 |
if ( state == SDL_ENABLE ) {
|
slouken@0
|
473 |
SDL_eventstate |= (0x00000001 << (type));
|
slouken@0
|
474 |
} else {
|
slouken@0
|
475 |
SDL_eventstate &= ~(0x00000001 << (type));
|
slouken@0
|
476 |
}
|
slouken@0
|
477 |
while ( SDL_PollEvent(&bitbucket) > 0 )
|
slouken@0
|
478 |
;
|
slouken@0
|
479 |
break;
|
slouken@0
|
480 |
default:
|
slouken@0
|
481 |
/* Querying state? */
|
slouken@0
|
482 |
break;
|
slouken@0
|
483 |
}
|
slouken@0
|
484 |
return(current_state);
|
slouken@0
|
485 |
}
|
slouken@0
|
486 |
|
slouken@0
|
487 |
/* This is a generic event handler.
|
slouken@0
|
488 |
*/
|
slouken@0
|
489 |
int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message)
|
slouken@0
|
490 |
{
|
slouken@0
|
491 |
int posted;
|
slouken@0
|
492 |
|
slouken@0
|
493 |
posted = 0;
|
slouken@0
|
494 |
if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) {
|
slouken@0
|
495 |
SDL_Event event;
|
slouken@0
|
496 |
memset(&event, 0, sizeof(event));
|
slouken@0
|
497 |
event.type = SDL_SYSWMEVENT;
|
slouken@0
|
498 |
event.syswm.msg = message;
|
slouken@0
|
499 |
if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
|
slouken@0
|
500 |
posted = 1;
|
slouken@0
|
501 |
SDL_PushEvent(&event);
|
slouken@0
|
502 |
}
|
slouken@0
|
503 |
}
|
slouken@0
|
504 |
/* Update internal event state */
|
slouken@0
|
505 |
return(posted);
|
slouken@0
|
506 |
}
|