nestopia/source/core/board/NstBoardNamcot163.cpp
2015-02-09 22:50:53 -05:00

525 lines
12 KiB
C++

////////////////////////////////////////////////////////////////////////////////////////
//
// 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
//
////////////////////////////////////////////////////////////////////////////////////////
#include <cstring>
#include "NstBoard.hpp"
#include "../NstTimer.hpp"
#include "../NstFile.hpp"
#include "NstBoardNamcot163.hpp"
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Namcot
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
N163::N163(const Context& c)
:
Board (c),
irq (*c.cpu),
sound (*c.apu)
{
}
N163::Sound::Sound(Apu& a,bool connect)
: Channel(a)
{
Reset();
bool audible = UpdateSettings();
if (connect)
Connect( audible );
}
void N163::SubReset(const bool hard)
{
irq.Reset( hard, hard || irq.Connected() );
Map( 0x4800U, 0x4FFFU, &N163::Peek_4800, &N163::Poke_4800 );
Map( 0x5000U, 0x57FFU, &N163::Peek_5000, &N163::Poke_5000 );
Map( 0x5800U, 0x5FFFU, &N163::Peek_5800, &N163::Poke_5800 );
Map( 0x8000U, 0x87FFU, CHR_SWAP_1K_0 );
Map( 0x8800U, 0x8FFFU, CHR_SWAP_1K_1 );
Map( 0x9000U, 0x97FFU, CHR_SWAP_1K_2 );
Map( 0x9800U, 0x9FFFU, CHR_SWAP_1K_3 );
Map( 0xA000U, 0xA7FFU, CHR_SWAP_1K_4 );
Map( 0xA800U, 0xAFFFU, CHR_SWAP_1K_5 );
Map( 0xB000U, 0xB7FFU, CHR_SWAP_1K_6 );
Map( 0xB800U, 0xBFFFU, CHR_SWAP_1K_7 );
Map( 0xC000U, 0xC7FFU, &N163::Poke_C000 );
Map( 0xC800U, 0xCFFFU, &N163::Poke_C800 );
Map( 0xD000U, 0xD7FFU, &N163::Poke_D000 );
Map( 0xD800U, 0xDFFFU, &N163::Poke_D800 );
Map( 0xE000U, 0xE7FFU, PRG_SWAP_8K_0 );
Map( 0xE800U, 0xEFFFU, PRG_SWAP_8K_1 );
Map( 0xF000U, 0xF7FFU, PRG_SWAP_8K_2 );
Map( 0xF800U, 0xFFFFU, &N163::Poke_F800 );
}
void N163::Irq::Reset(const bool hard)
{
if (hard)
count = 0;
}
void N163::Sound::Reset()
{
exAddress = 0x00;
exIncrease = 0x01;
startChannel = NUM_CHANNELS;
frequency = 0;
std::memset( wave, 0, sizeof(wave) );
std::memset( exRam, 0, sizeof(exRam) );
for (uint i=0; i < NUM_CHANNELS; ++i)
channels[i].Reset();
dcBlocker.Reset();
}
void N163::Sound::BaseChannel::Reset()
{
enabled = false;
active = false;
timer = 0;
frequency = 0;
phase = 0;
waveLength = 0;
waveOffset = 0;
volume = 0;
}
void N163::Load(File& file)
{
if (board.HasBattery() && (board == Type::NAMCOT_163_S_0 || board == Type::NAMCOT_163_S_1))
{
const File::LoadBlock block[] =
{
{ wrk.Source().Mem(), board.GetWram() },
{ sound.GetExRam(), Sound::EXRAM_SIZE }
};
file.Load( File::BATTERY, block );
}
else
{
Board::Load( file );
}
}
void N163::Save(File& file) const
{
if (board.HasBattery() && (board == Type::NAMCOT_163_S_0 || board == Type::NAMCOT_163_S_1))
{
const File::SaveBlock block[] =
{
{ wrk.Source().Mem(), board.GetWram() },
{ sound.GetExRam(), Sound::EXRAM_SIZE }
};
file.Save( File::BATTERY, block );
}
else
{
Board::Save( file );
}
}
byte* N163::Sound::GetExRam()
{
return exRam;
}
const byte* N163::Sound::GetExRam() const
{
return exRam;
}
void N163::Sound::SaveState(State::Saver& state,const dword baseChunk) const
{
state.Begin( baseChunk );
state.Begin( AsciiId<'R','E','G'>::V ).Write8( exAddress | (exIncrease << 7) ).End();
state.Begin( AsciiId<'R','A','M'>::V ).Compress( exRam ).End();
state.End();
}
void N163::Sound::LoadState(State::Loader& state)
{
while (const dword chunk = state.Begin())
{
switch (chunk)
{
case AsciiId<'R','E','G'>::V:
{
const uint data = state.Read8();
exAddress = data & 0x7F;
exIncrease = data >> 7;
break;
}
case AsciiId<'R','A','M'>::V:
state.Uncompress( exRam );
for (uint i=0; i < sizeof(exRam); ++i)
{
wave[i*2+0] = (exRam[i] & 0xFU) << 2;
wave[i*2+1] = (exRam[i] >> 4) << 2;
}
for (uint i=64; i < sizeof(exRam); i += 8)
{
BaseChannel& channel = channels[(i - 64) >> 3];
channel.Reset();
channel.SetFrequency ( FetchFrequency(i) );
channel.SetWaveLength ( exRam[i+4] );
channel.SetWaveOffset ( exRam[i+6] );
channel.SetVolume ( exRam[i+7] );
channel.Validate();
}
SetChannelState( exRam[0x7F] );
break;
}
state.End();
}
}
void N163::SubLoad(State::Loader& state,const dword baseChunk)
{
NST_VERIFY( baseChunk == (AsciiId<'N','6','3'>::V) );
if (baseChunk == AsciiId<'N','6','3'>::V)
{
while (const dword chunk = state.Begin())
{
switch (chunk)
{
case AsciiId<'I','R','Q'>::V:
{
State::Loader::Data<3> data( state );
irq.unit.count = data[1] | (data[2] << 8 & 0x7F00) | (data[0] << 15 & 0x8000);
break;
}
case AsciiId<'S','N','D'>::V:
sound.LoadState( state );
break;
}
state.End();
}
}
}
void N163::SubSave(State::Saver& state) const
{
state.Begin( AsciiId<'N','6','3'>::V );
const byte data[3] =
{
irq.unit.count >> 15,
irq.unit.count >> 0 & 0xFF,
irq.unit.count >> 8 & 0x7F
};
state.Begin( AsciiId<'I','R','Q'>::V ).Write( data ).End();
sound.SaveState( state, AsciiId<'S','N','D'>::V );
state.End();
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
bool N163::Irq::Clock()
{
return (count - 0x8000 < 0x7FFF) && (++count == 0xFFFF);
}
inline bool N163::Sound::BaseChannel::CanOutput() const
{
return volume && frequency && enabled;
}
inline void N163::Sound::BaseChannel::Validate()
{
active = CanOutput();
}
inline void N163::Sound::BaseChannel::SetFrequency(const uint f)
{
frequency = f;
}
inline void N163::Sound::BaseChannel::SetWaveLength(const uint data)
{
//const dword length = (0x20UL - (data & REG_WAVELENGTH)) << PHASE_SHIFT;
const dword length = (0x100UL - (data & REG_WAVELENGTH)) << PHASE_SHIFT;
if (waveLength != length)
{
waveLength = length;
phase = 0;
}
enabled = data >> REG_ENABLE_SHIFT;
}
inline void N163::Sound::BaseChannel::SetWaveOffset(const uint data)
{
waveOffset = data;
}
inline void N163::Sound::BaseChannel::SetVolume(const uint data)
{
volume = (data & REG_VOLUME) * VOLUME;
}
inline dword N163::Sound::BaseChannel::GetSample
(
const Cycle rate,
const Cycle factor,
const byte (&wave)[0x100]
)
{
NST_VERIFY( bool(active) == CanOutput() );
if (active)
{
phase = (phase + (timer + rate) / factor * frequency) % waveLength;
timer = (timer + rate) % factor;
return wave[(waveOffset + (phase >> PHASE_SHIFT)) & 0xFF] * dword(volume);
}
return 0;
}
N163::Sound::Sample N163::Sound::GetSample()
{
if (output)
{
dword sample = 0;
for (BaseChannel* channel = channels+startChannel; channel != channels+NUM_CHANNELS; ++channel)
sample += channel->GetSample( rate, frequency, wave );
return dcBlocker.Apply( sample * output / DEFAULT_VOLUME );
}
else
{
return 0;
}
}
bool N163::Sound::UpdateSettings()
{
uint volume = GetVolume(EXT_N163) * 68U / DEFAULT_VOLUME;
output = IsMuted() ? 0 : volume;
rate = GetCpuClockBase() * qaword(1UL << SPEED_SHIFT) / (GetSampleRate() * 45UL * GetCpuClockDivider());
dcBlocker.Reset();
return volume;
}
inline void N163::Sound::SetChannelState(uint data)
{
data = (data >> 4 & 0x7) + 1;
frequency = dword(data) << SPEED_SHIFT;
startChannel = NUM_CHANNELS - data;
}
inline dword N163::Sound::FetchFrequency(uint address) const
{
address &= 0x78;
return
(
(dword(exRam[address+0x0] ) << 0) |
(dword(exRam[address+0x2] ) << 8) |
(dword(exRam[address+0x4] & 0x3U) << 16)
);
}
inline void N163::Sound::WriteWave(const uint data)
{
const uint index = exAddress << 1;
wave[index+0] = (data & 0xF) << 2;
wave[index+1] = (data >> 4) << 2;
}
uint N163::Sound::ReadData()
{
const uint data = exRam[exAddress];
exAddress = (exAddress + exIncrease) & 0x7F;
return data;
}
NES_PEEK(N163,4800)
{
return sound.ReadData();
}
void N163::Sound::WriteData(const uint data)
{
Update();
WriteWave( data );
exRam[exAddress] = data;
if (exAddress >= 0x40)
{
BaseChannel& channel = channels[(exAddress - 0x40) >> 3];
switch (exAddress & 0x7)
{
case 0x4:
channel.SetWaveLength( data );
case 0x0:
case 0x2:
channel.SetFrequency( FetchFrequency(exAddress) );
break;
case 0x6:
channel.SetWaveOffset( data );
break;
case 0x7:
channel.SetVolume( data );
if (exAddress == 0x7F)
SetChannelState( data );
break;
}
channel.Validate();
}
exAddress = (exAddress + exIncrease) & 0x7F;
}
NES_POKE_D(N163,4800)
{
sound.WriteData( data );
}
NES_PEEK(N163,5000)
{
irq.Update();
return irq.unit.count & 0xFF;
}
NES_POKE_D(N163,5000)
{
irq.Update();
irq.unit.count = (irq.unit.count & 0xFF00) | data;
irq.ClearIRQ();
}
NES_PEEK(N163,5800)
{
irq.Update();
return irq.unit.count >> 8;
}
NES_POKE_D(N163,5800)
{
irq.Update();
irq.unit.count = (irq.unit.count & 0x00FF) | (data << 8);
irq.ClearIRQ();
}
void N163::Sound::WriteAddress(const uint data)
{
NST_COMPILE_ASSERT( EXRAM_INC == 0x80 );
exAddress = data & 0x7F;
exIncrease = data >> 7;
}
void N163::SwapNmt(const uint address,const uint data) const
{
ppu.Update();
nmt.Source( data < 0xE0 ).SwapBank<SIZE_1K>( address, data );
}
NES_POKE_D(N163,C000)
{
SwapNmt( 0x0000, data );
}
NES_POKE_D(N163,C800)
{
SwapNmt( 0x0400, data );
}
NES_POKE_D(N163,D000)
{
SwapNmt( 0x0800, data );
}
NES_POKE_D(N163,D800)
{
SwapNmt( 0x0C00, data );
}
NES_POKE_D(N163,F800)
{
sound.WriteAddress( data );
}
void N163::Sync(Event event,Input::Controllers* controllers)
{
if (event == EVENT_END_FRAME)
irq.VSync();
Board::Sync( event, controllers );
}
}
}
}
}