/*
	context_x11.c

	general x11 context layer

	Copyright (C) 1996-1997  Id Software, Inc.
	Copyright (C) 2000       Zephaniah E. Hull <warp@whitestar.soark.net>
	Copyright (C) 1999,2000  contributors of the QuakeForge project
	Please see the file "AUTHORS" for a list of contributors

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program 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 General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#include <config.h>

#include <ctype.h>
#include <sys/time.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/keysym.h>
#include <X11/extensions/XShm.h>
#include <errno.h>

#include <context_x11.h>
#include <qtypes.h>
#include <vid.h>
#include <sys.h>

static void (*event_handlers[LASTEvent])	(XEvent *);
qboolean	oktodraw = false;
int 		x_shmeventtype;

static int	x_disp_ref_count = 0;

Display		*x_disp = NULL;

qboolean
x11_add_event(int event, void (*event_handler)(XEvent *))
{
	if (event >= LASTEvent) {
		printf("event: %d, LASTEvent: %d\n", event, LASTEvent);
		return false;
	}
	if (event_handlers[event] != NULL)
		return false;

	event_handlers[event] = event_handler;
	return true;
}

qboolean
x11_del_event(int event, void (*event_handler)(XEvent *))
{
	if (event >= LASTEvent)
		return false;
	if (event_handlers[event] != event_handler)
		return false;

	event_handlers[event] = NULL;
	return true;
}

void
x11_process_event( void )
{
	XEvent	x_event;

	XNextEvent(x_disp, &x_event);
	if ( x_event.type >= LASTEvent ) {
		// FIXME: KLUGE!!!!!!
		if (x_event.type == x_shmeventtype)
			oktodraw = 1;
		return;
	}
	if (event_handlers[x_event.type])
		event_handlers[x_event.type](&x_event);
}

void
x11_process_events(void)
{
	/* Get events from X server. */
	while ( XPending( x_disp )) {
		x11_process_event();
	}
}

// ========================================================================
// Tragic death handler
// ========================================================================

static void
TragicDeath(int sig)
{
	printf("Received signal %d, exiting...\n", sig);
	Sys_Quit();
	exit(sig);
	//XCloseDisplay(x_disp);
	//VID_Shutdown();
	//Sys_Error("This death brought to you by the number %d\n", signal_num);
}

void
x11_open_display( void )
{
	if ( !x_disp ) {
		x_disp = XOpenDisplay( NULL );
		if ( !x_disp ) {
			Sys_Error("x11_open_display: Could not open display [%s]\n", XDisplayName( NULL ));
		}

		// catch signals
		signal(SIGHUP, TragicDeath);
		signal(SIGINT, TragicDeath);
		signal(SIGQUIT, TragicDeath);
		signal(SIGILL, TragicDeath);
		signal(SIGTRAP, TragicDeath);
		signal(SIGIOT, TragicDeath);
		signal(SIGBUS, TragicDeath);
		/*	signal(SIGFPE, TragicDeath); */
		signal(SIGSEGV, TragicDeath);
		signal(SIGTERM, TragicDeath);

		// for debugging only
		XSynchronize( x_disp, True );

		x_disp_ref_count=1;
	} else {
		x_disp_ref_count++;
	}
}

void
x11_close_display( void )
{
	if (!--x_disp_ref_count) {
		XCloseDisplay( x_disp );
		x_disp = NULL;
	}
}