Yet Another SEGA MASTER SYSTEM Emulator その２

とりあえず簡単なラッパークラスを書いただけですが、YM2413を移植しました。VDPの違いによる色化けもお楽しみください。

http://www.geocities.jp/parallel_computer_inc/android.html

ym2413.h

/*
	Skelton for retropc emulator

	Author : Takeo.Namiki
	Date   : 2013.10.26-

	[ YM2413 ]
*/

#ifndef _YM2413_H_
#define _YM2413_H_

#include "vm.h"
#include "../emu.h"
#include "device.h"

typedef INT16 SAMP;
typedef void (*OPLL_UPDATEHANDLER)(int param,int min_interval_us);
void YM2413SetUpdateHandler(int which, OPLL_UPDATEHANDLER UpdateHandler, int param);

class YM2413 : public DEVICE
{
private:
	uint8 latch;
	uint8 reg[0x40];
	bool mute;
public:
	YM2413(VM* parent_vm, EMU* parent_emu) : DEVICE(parent_vm, parent_emu) {}
	~YM2413() {}
	
	// common functions
	void initialize();
	void release();
	void reset();
	void write_io8(uint32 addr, uint32 data);
	uint32 read_io8(uint32 addr);
	void mix(int32* buffer, int cnt);
	
	// unique functions
	void init(int rate, int clock, int samples);
};

#endif

ym2413.c

/*
**
** File: ym2413.c - software implementation of YM2413
**                  FM sound generator type OPLL
**
** Copyright (C) 2002 Jarek Burczynski
**
** Version 1.0
**


to do:

- make sure of the sinus amplitude bits

- make sure of the EG resolution bits (looks like the biggest
  modulation index generated by the modulator is 123, 124 = no modulation)
- find proper algorithm for attack phase of EG

- tune up instruments ROM

- support sample replay in test mode (it is NOT as simple as setting bit 0
  in register 0x0f and using register 0x10 for sample data).
  Which games use this feature ?
*/

#include "ym2413.h"

#define MAME_INLINE static
#define logerror(...)
#ifndef PI
#define PI 3.14159265358979323846
#endif

（中略）

/*
	Skelton for retropc emulator

	Author : Takeo.Namiki
	Date   : 2013.10.26-

	[ YM2413 ]
*/

void YM2413::initialize()
{
	mute = false;
}

void YM2413::release()
{
	YM2413Shutdown();
}

void YM2413::reset()
{
	YM2413ResetChip(0);
}

void YM2413::write_io8(uint32 addr, uint32 data)
{
	if (addr & 1) {
		reg[ latch & 0x3F] = data;
		latch = data;
	} else {
		latch = data;
	}
	YM2413Write(0, addr & 1, data);
}

uint32 YM2413::read_io8(uint32 addr)
{
	return latch;
}

void YM2413::mix(int32* buffer, int cnt)
{
	if(mute) {
		return;
	}
	INT16 *buf[2];
	buf[0]=(INT16 *)malloc(sizeof(INT16) * cnt);
	buf[1]=(INT16 *)malloc(sizeof(INT16) * cnt);
	if(cnt > 0) YM2413UpdateOne(0, buf, cnt);
	for(int i = 0; i < cnt; i++) {
		int32 vol1 = 0;
		int32 vol2 = 0;
		vol1 += buf[0][i];
		vol2 += buf[1][i];
		*buffer++ += vol1<<2; // L
		*buffer++ += vol2<<2; // R
	}
	free(buf[0]);
	free(buf[1]);
}

void YM2413::init(int rate, int clock, int samples)
{
	YM2413Init(1, clock, rate);
	YM2413ResetChip(0);
}

mastersystem.cpp

/*
	SEGA MASTER SYSTEM Emulator 'yaMASTER SYSTEM'

	Author : tanam
	Date   : 2013.10.20-

	[ virtual machine ]
*/

#include "mastersystem.h"
#include "../../emu.h"
#include "../device.h"
#include "../event.h"

///#include "../datarec.h"
///#include "../disk.h"
///#include "../i8251.h"
#include "../i8255.h"
#include "../io.h"
#include "../ym2413.h"
#include "../sn76489an.h"
#include "../315-5124.h"
///#include "../upd765a.h"
#include "../z80.h"

#include "keyboard.h"
#include "memory.h"
#include "system.h"

// ----------------------------------------------------------------------------
// initialize
// ----------------------------------------------------------------------------

VM::VM(EMU* parent_emu) : emu(parent_emu)
{
	// create devices
	first_device = last_device = NULL;
	dummy = new DEVICE(this, emu);	// must be 1st device
	event = new EVENT(this, emu);	// must be 2nd device
	
///	drec = new DATAREC(this, emu);
///	sio = new I8251(this, emu);
	pio_k = new I8255(this, emu);
	pio_f = new I8255(this, emu);
	io = new IO(this, emu);
	psg = new SN76489AN(this, emu);
	fm = new YM2413(this, emu);
	vdp = new _315_5124(this, emu);
///	fdc = new UPD765A(this, emu);
	cpu = new Z80(this, emu);
	
	key = new KEYBOARD(this, emu);
	memory = new MEMORY(this, emu);
	system = new SYSTEM(this, emu);

	// set contexts
	event->set_context_cpu(cpu);
	event->set_context_sound(psg);
	event->set_context_sound(fm);

///	drec->set_context_out(pio_k, SIG_I8255_PORT_B, 0x80);
	pio_k->set_context_port_c(key, SIG_KEYBOARD_COLUMN, 0x07, 0);
///	pio_k->set_context_port_c(drec, SIG_DATAREC_REMOTE, 0x08, 0);
///	pio_k->set_context_port_c(drec, SIG_DATAREC_OUT, 0x10, 0);
///	pio_f->set_context_port_c(fdc, SIG_UPD765A_MOTOR_NEG, 2, 0);
///	pio_f->set_context_port_c(fdc, SIG_UPD765A_TC, 4, 0);
///	pio_f->set_context_port_c(fdc, SIG_UPD765A_RESET, 8, 0);
	pio_f->set_context_port_c(memory, SIG_MEMORY_SEL, 0x40, 0);
	vdp->set_context_irq(cpu, SIG_CPU_IRQ, 1);
///	fdc->set_context_irq(pio_f, SIG_I8255_PORT_A, 1);
///	fdc->set_context_index(pio_f, SIG_I8255_PORT_A, 4);
	
	key->set_context_cpu(cpu);
	key->set_context_pio(pio_k);
	system->set_context_key(key);
///	vdp->set_context_cpu(cpu);
	vdp->set_context_key(key);
	vdp->set_context_psg(psg);

	// cpu bus
	cpu->set_context_mem(memory);
	cpu->set_context_io(io);
	cpu->set_context_intr(system);

	// i/o bus
	io->set_iomap_single_r(0x00, system);       // GG  START
	io->set_iomap_single_w(0x80, system);       // COL TENKEY
	io->set_iomap_single_w(0xc0, system);       // COL JOYPAD
	io->set_iomap_range_rw(0xfc, 0xfe, system); // COL JOYPAD
	io->set_iomap_range_rw(0xff, 0xff, psg);    // COL PSG
	io->set_iomap_range_rw(0x7e, 0x7f, vdp);    // SG  VDP
	io->set_iomap_range_rw(0xbe, 0xbf, vdp);    // SG  VDP
	io->set_iomap_range_rw(0xdc, 0xdf, pio_k);  // SG  KEY
///	io->set_iomap_range_rw(0xe0, 0xe3, fdc);    // SG  FDD
///	io->set_iomap_range_rw(0xe4, 0xe7, pio_f);  // SG  FDD
///	io->set_iomap_range_rw(0xe8, 0xe9, sio);    // SG  SERIAL
	io->set_iomap_range_rw(0xf0, 0xf2, fm);     // MS  FM

	// initialize all devices
	for(DEVICE* device = first_device; device; device = device->next_device) {
		device->initialize();
	}

	// BIOS
	memory->bios();

///	for(int i = 0; i < 4; i++) {
///		fdc->set_drive_type(i, DRIVE_TYPE_2D);
///	}
}

VM::~VM()
{
	// delete all devices
	for(DEVICE* device = first_device; device;) {
		DEVICE *next_device = device->next_device;
		device->release();
		delete device;
		device = next_device;
	}
}

DEVICE* VM::get_device(int id)
{
	for(DEVICE* device = first_device; device; device = device->next_device) {
		if(device->this_device_id == id) {
			return device;
		}
	}
	return NULL;
}

// ----------------------------------------------------------------------------
// drive virtual machine
// ----------------------------------------------------------------------------

void VM::reset()
{
	// reset all devices
	for(DEVICE* device = first_device; device; device = device->next_device) {
		device->reset();
	}
}

void VM::run()
{
	event->drive();
}

// ----------------------------------------------------------------------------
// draw screen
// ----------------------------------------------------------------------------

void VM::draw_screen()
{
	vdp->draw_screen();
}

///int VM::access_lamp()
///{
///	uint32 status = fdc->read_signal(0);
///	return (status & (1 | 4)) ? 1 : (status & (2 | 8)) ? 2 : 0;
///}

// ----------------------------------------------------------------------------
// soud manager
// ----------------------------------------------------------------------------

void VM::initialize_sound(int rate, int samples)
{
	// init sound manager
	event->initialize_sound(rate, samples);
	
	// init sound gen
	psg->init(rate, 3579545, 4000);
	fm->init(rate, 3579545, samples);
}

uint16* VM::create_sound(int* extra_frames)
{
	return event->create_sound(extra_frames);
}

int VM::sound_buffer_ptr()
{
	return event->sound_buffer_ptr();
}

// ----------------------------------------------------------------------------
// user interface
// ----------------------------------------------------------------------------

void VM::open_cart(int drv, _TCHAR* file_path)
{
	if(drv == 0) {
		memory->open_cart(file_path);
		if (strstr(file_path, ".col") || 
			strstr(file_path, ".COL")) {
				vdp->set_console(0x00);
				memory->bios();
		} else {
			if (strstr(file_path, ".gg") || 
				strstr(file_path, ".GG")) vdp->set_console(0x40);
			else
				vdp->set_console(0x20);
		}
		reset();
	}
}

void VM::close_cart(int drv)
{
	if(drv == 0) {
		memory->close_cart();
		reset();
	}
}

bool VM::cart_inserted(int drv)
{
	if(drv == 0) {
		return memory->cart_inserted();
	} else {
		return false;
	}
}

///void VM::open_disk(int drv, _TCHAR* file_path, int offset)
///{
///	fdc->open_disk(drv, file_path, offset);
///}

///void VM::close_disk(int drv)
///{
///	fdc->close_disk(drv);
///}

///bool VM::disk_inserted(int drv)
///{
///	return fdc->disk_inserted(drv);
///}

///void VM::play_tape(_TCHAR* file_path)
///{
///	drec->play_tape(file_path);
///}

///void VM::rec_tape(_TCHAR* file_path)
///{
///	drec->rec_tape(file_path);
///}

///void VM::close_tape()
///{
///	drec->close_tape();
///}

///bool VM::tape_inserted()
///{
///	return drec->tape_inserted();
///}

bool VM::now_skip()
{
	return event->now_skip();
}

void VM::update_config()
{
	for(DEVICE* device = first_device; device; device = device->next_device) {
		device->update_config();
	}
}