sdl_xbiosevents.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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
    [e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_xbiosevents.c,v 1.1 2002/04/22 21:38:04 wmay Exp $";
#endif

/*
 *	XBIOS mouse & joystick vectors
 *
 *	Patrice Mandin
 */

#include <stdlib.h>
#include <string.h>
#include <mint/osbind.h>

#include "SDL_events_c.h"
#include "SDL_xbiosevents_c.h"
#include "SDL_xbiosinterrupt_s.h"

/* Variables */

int SDL_AtariXbios_enabled=0;

static _KBDVECS *kbdvecs;		/* Pointer to access vectors */
static _KBDVECS sys_kbdvecs;	/* Backup of system vectors */
static Uint16 atari_prevmouseb;	/* buttons */

void SDL_AtariXbios_InstallVectors(int vectors_mask)
{
	void *oldpile;

	/* Clear variables */
	SDL_AtariXbios_mouseb =
		SDL_AtariXbios_mousex =
		SDL_AtariXbios_mousey =
		SDL_AtariXbios_joystick =
		atari_prevmouseb = 0;

	/* Read IKBD vectors base */
	kbdvecs=Kbdvbase();

	/* Go to supervisor mode */
	oldpile=(void *)Super(0);

	/* Backup system vectors */
	memcpy(&sys_kbdvecs, kbdvecs, sizeof(_KBDVECS));

	/* Install our vector */
	SDL_AtariXbios_Install(
		kbdvecs,
		(vectors_mask & ATARI_XBIOS_MOUSEEVENTS) ? SDL_AtariXbios_MouseVector : NULL,
		(vectors_mask & ATARI_XBIOS_JOYSTICKEVENTS) ? SDL_AtariXbios_JoystickVector : NULL
	);

	/* Back to user mode */
	Super(oldpile);

	SDL_AtariXbios_enabled=1;
}

void SDL_AtariXbios_RestoreVectors(void)
{
	void *oldpile;

	/* Go to supervisor mode */
	oldpile=(void *)Super(NULL);

	/* Reinstall system vector */
	SDL_AtariXbios_Install(kbdvecs,sys_kbdvecs.mousevec,sys_kbdvecs.joyvec);

	/* Back to user mode */
	Super(oldpile);
}

static int atari_GetButton(int button)
{
	switch(button)
	{
		case 0:
			return SDL_BUTTON_RIGHT;
			break;
		case 1:
		default:
			return SDL_BUTTON_LEFT;
			break;
	}
}

void SDL_AtariXbios_PostMouseEvents(_THIS)
{
	/* Mouse motion ? */
	if (SDL_AtariXbios_mousex || SDL_AtariXbios_mousey) {
		SDL_PrivateMouseMotion(0, 1, SDL_AtariXbios_mousex, SDL_AtariXbios_mousey);
		SDL_AtariXbios_mousex = SDL_AtariXbios_mousey = 0;
	}
	
	/* Mouse button ? */
	if (SDL_AtariXbios_mouseb != atari_prevmouseb) {
		int i;

		for (i=0;i<2;i++) {
			int curbutton, prevbutton;

			curbutton = SDL_AtariXbios_mouseb & (1<<i);
			prevbutton = atari_prevmouseb & (1<<i);

			if (curbutton && !prevbutton) {
				SDL_PrivateMouseButton(SDL_PRESSED, atari_GetButton(i), 0, 0);
			}
			if (!curbutton && prevbutton) {
				SDL_PrivateMouseButton(SDL_RELEASED, atari_GetButton(i), 0, 0);
			}
		}
		atari_prevmouseb = SDL_AtariXbios_mouseb;
	}
}