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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
//
// This file is part of Nestopia.
//
// Nestopia 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.
//
// Nestopia 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 Nestopia; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
////////////////////////////////////////////////////////////////////////////////////////
#ifndef NST_BOARD_NAMCOT_163_H
#define NST_BOARD_NAMCOT_163_H
#ifdef NST_PRAGMA_ONCE
#pragma once
#endif
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Namcot
{
class N163 : public Board
{
public:
explicit N163(const Context&);
class Sound : public Apu::Channel
{
public:
explicit Sound(Apu&,bool=true);
enum
{
EXRAM_SIZE = 0x80
};
void WriteData(uint);
uint ReadData();
void WriteAddress(uint);
byte* GetExRam();
const byte* GetExRam() const;
void SaveState(State::Saver&,dword) const;
void LoadState(State::Loader&);
protected:
void Reset();
bool UpdateSettings();
Sample GetSample();
private:
inline void SetChannelState(uint);
inline void WriteWave(uint);
inline dword FetchFrequency(uint) const;
enum
{
NUM_CHANNELS = 8,
EXRAM_INC = 0x80,
//REG_WAVELENGTH = 0x1C,
REG_WAVELENGTH = 0xFC,
REG_ENABLE_SHIFT = 5,
REG_VOLUME = 0x0F,
PHASE_SHIFT = 18,
SPEED_SHIFT = 20
};
class BaseChannel
{
public:
void Reset();
inline dword GetSample(Cycle,Cycle,const byte (&)[0x100]);
inline void SetFrequency (uint);
inline void SetWaveLength (uint);
inline void SetWaveOffset (uint);
inline void SetVolume (uint);
inline void Validate();
private:
enum
{
VOLUME = OUTPUT_MUL / 16
};
inline bool CanOutput() const;
ibool enabled;
ibool active;
Cycle timer;
Cycle frequency;
Cycle phase;
dword waveLength;
uint waveOffset;
uint volume;
};
uint output;
Cycle rate;
Cycle frequency;
uint exAddress;
uint exIncrease;
uint startChannel;
byte wave[0x100];
byte exRam[0x80];
BaseChannel channels[NUM_CHANNELS];
DcBlocker dcBlocker;
};
private:
void SubReset(bool);
void SubSave(State::Saver&) const;
void SubLoad(State::Loader&,dword);
void Load(File&);
void Save(File&) const;
void Sync(Event,Input::Controllers*);
void SwapChr(uint,uint,uint) const;
void SwapNmt(uint,uint) const;
struct Irq
{
void Reset(bool);
bool Clock();
uint count;
};
NES_DECL_PEEK( 4800 );
NES_DECL_POKE( 4800 );
NES_DECL_PEEK( 5000 );
NES_DECL_POKE( 5000 );
NES_DECL_PEEK( 5800 );
NES_DECL_POKE( 5800 );
NES_DECL_POKE( C000 );
NES_DECL_POKE( C800 );
NES_DECL_POKE( D000 );
NES_DECL_POKE( D800 );
NES_DECL_POKE( F800 );
Timer::M2<Irq> irq;
Sound sound;
};
}
}
}
}
#endif
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