/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

/*

 *	XBIOS mouse & joystick vectors

 *

 *	Patrice Mandin

 */

	.text

	.globl	_SDL_AtariXbios_Install

	.globl	_SDL_AtariXbios_Restore

	.globl	_SDL_AtariXbios_MouseVector

	.globl	_SDL_AtariXbios_JoystickVector

	.globl	_SDL_AtariXbios_mouselock

	.globl	_SDL_AtariXbios_mouseb

	.globl	_SDL_AtariXbios_mousex

	.globl	_SDL_AtariXbios_mousey

	.globl	_SDL_AtariXbios_joystick

/*--- Vector installer ---*/

_SDL_AtariXbios_Install:

	movel	sp@(4),a0

	/* Stop interrupts */

	movew	#0x2700,sr

	/* Save old mouse vector, set our routine */

	clrl	oldmousevector

	movel	sp@(8),d0

	beqs	no_new_mouse_vector

	movel	a0@(16),oldmousevector

	movel	d0,a0@(16)

no_new_mouse_vector:

	/* Save old joystick vector, set our routine */

	clrl	oldjoystickvector

	movel	sp@(12),d0

	beqs	no_new_joystick_vector

	movel	a0@(24),oldjoystickvector

	movel	d0,a0@(24)

no_new_joystick_vector:

	/* Restart interrupts */

	movew	#0x2300,sr

	rts

/*--- Vector restorer ---*/

_SDL_AtariXbios_Restore:

	movel	sp@(4),a0

	/* Stop interrupts */

	movew	#0x2700,sr

	/* Restore mouse vector */

	movel	oldmousevector,d0

	beqs	no_restore_mouse

	movel	d0,a0@(16)

no_restore_mouse:

	/* Restore joystick vector */

	movel	oldjoystickvector,d0

	beqs	no_restore_joystick

	movel	d0,a0@(24)

no_restore_joystick:

	/* Restart interrupts */

	movew	#0x2300,sr

	rts

/*--- Our mouse vector ---*/

	.text

	.even

	.ascii "XBRA"

	.ascii "LSDL"

	.comm	oldmousevector,4*1

_SDL_AtariXbios_MouseVector:

	movel	d0,sp@-

	/* Mouse buttons */

	moveb	(a0),d0

	andw	#3,d0

	movew	d0,_SDL_AtariXbios_mouseb

	/* X movement */

	moveb	a0@(1),d0

	extw	d0

	addw	d0,_SDL_AtariXbios_mousex

	/* Y movement */

	moveb	a0@(2),d0

	extw	d0

	addw	d0,_SDL_AtariXbios_mousey

	/* Lock mouse position ? */

	tstw	_SDL_AtariXbios_mouselock

	beq.s	no_mouse_lock

	clrb	a0@(1)

	clrb	a0@(2)

no_mouse_lock:

	/* Jump through old vector */

	movel	sp@+,d0

	movel	oldmousevector,sp@-

	rts

	.data

	.even

	.comm	_SDL_AtariXbios_mouselock,2*1

	.comm	_SDL_AtariXbios_mousex,2*1

	.comm	_SDL_AtariXbios_mousey,2*1

	.comm	_SDL_AtariXbios_mouseb,2*1

/*--- Our joystick vector ---*/

	.text

	.even

	.ascii "XBRA"

	.ascii "LSDL"

	.comm	oldjoystickvector,4*1

_SDL_AtariXbios_JoystickVector:

	movel	d0,sp@-

	/* New joystick state */

	moveb	a0@(2),d0

	andw	#0x8f,d0

	movew	d0,_SDL_AtariXbios_joystick

	/* Jump through old vector */

	movel	sp@+,d0

	movel	oldjoystickvector,sp@-

	rts

	.data

	.even

	.comm	_SDL_AtariXbios_joystick,2*1