blueMSX-libretro/Src/Input/Sg1000JoyIo.c

/*****************************************************************************
** $Source: /cygdrive/d/Private/_SVNROOT/bluemsx/blueMSX/Src/Input/Sg1000JoyIo.c,v $
**
** $Revision: 1.4 $
**
** $Date: 2008-03-30 18:38:40 $
**
** More info: http://www.bluemsx.com
**
** Copyright (C) 2003-2006 Daniel Vik
**
** 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 the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
******************************************************************************
*/
#include "Sg1000JoyIo.h"
#include "Sg1000Joystick.h"
#include "Sg1000JoystickDevice.h"
#include "JoystickPort.h"
#include "InputEvent.h"
#include "DeviceManager.h"
#include "SaveState.h"
#include "MediaDb.h"

#include "SviJoystick.h"

#include <stdlib.h>

struct Sg1000JoyIo {
    Sg1000JoystickDevice* joyDevice[2];
    int joyDeviceHandle;
    int deviceHandle;
};

static void joyIoHandler(Sg1000JoyIo* joyIo, int port, JoystickPortType type)
{
    if (port >= 2) {
        return;
    }

    if (joyIo->joyDevice[port] != NULL && joyIo->joyDevice[port]->destroy != NULL) {
        joyIo->joyDevice[port]->destroy(joyIo->joyDevice[port]);
    }
    
    switch (type) {
    default:
    case JOYSTICK_PORT_NONE:
        joyIo->joyDevice[port] = NULL;
        break;
    case JOYSTICK_PORT_JOYSTICK:
        joyIo->joyDevice[port] = sg1000JoystickCreate(port);
        break;
    }
}

static void loadState(Sg1000JoyIo* joyIo)
{
    int i;
    for (i = 0; i < 2; i++) {
        if (joyIo->joyDevice[i] != NULL && joyIo->joyDevice[i]->loadState != NULL) {
            joyIo->joyDevice[i]->loadState(joyIo->joyDevice[i]);
        }
    }
}

static void saveState(Sg1000JoyIo* joyIo)
{
    int i;
    for (i = 0; i < 2; i++) {
        if (joyIo->joyDevice[i] != NULL && joyIo->joyDevice[i]->saveState != NULL) {
            joyIo->joyDevice[i]->saveState(joyIo->joyDevice[i]);
        }
    }
}

static void reset(Sg1000JoyIo* joyIo)
{
    int i;
    for (i = 0; i < 2; i++) {
        if (joyIo->joyDevice[i] != NULL && joyIo->joyDevice[i]->reset != NULL) {
            joyIo->joyDevice[i]->reset(joyIo->joyDevice[i]);
        }
    }
}

static void destroy(Sg1000JoyIo* joyIo)
{
    int i;
    for (i = 0; i < 2; i++) {
        if (joyIo->joyDevice[i] != NULL && joyIo->joyDevice[i]->destroy != NULL) {
            joyIo->joyDevice[i]->destroy(joyIo->joyDevice[i]);
        }
    }

    joystickPortUpdateHandlerUnregister();

    deviceManagerUnregister(joyIo->deviceHandle);
}

UInt16 sg1000JoyIoRead(Sg1000JoyIo* joyIo) 
{
    UInt16 state = 0xf000;
    if (joyIo->joyDevice[0] != NULL && joyIo->joyDevice[0]->read != NULL) {
        state |= joyIo->joyDevice[0]->read(joyIo->joyDevice[0]) << 0;
    }
    if (joyIo->joyDevice[1] != NULL && joyIo->joyDevice[1]->read != NULL) {
        state |= (UInt16)joyIo->joyDevice[1]->read(joyIo->joyDevice[1]) << 6;
    }
    return state;
}

Sg1000JoyIo* sg1000JoyIoCreate() 
{
    DeviceCallbacks callbacks = { destroy, reset, saveState, loadState };
    Sg1000JoyIo* sg1000JoyIo = (Sg1000JoyIo*)calloc(1, sizeof(Sg1000JoyIo));

    joystickPortUpdateHandlerRegister(joyIoHandler, sg1000JoyIo);

    sg1000JoyIo->deviceHandle = deviceManagerRegister(ROM_UNKNOWN, &callbacks, sg1000JoyIo);

    return sg1000JoyIo;
}