nestopia/source/core/board/NstBoardKonamiVrc4.cpp
2012-09-02 13:13:55 -04:00

319 lines
8.3 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 "../NstTimer.hpp"
#include "NstBoard.hpp"
#include "NstBoardKonamiVrc4.hpp"
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Konami
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
uint Vrc4::GetPrgLineShift(const Context& c,const uint pin,const uint def)
{
if (const Chips::Type* const vrc4 = c.chips.Find(L"Konami VRC IV"))
{
const uint line = *vrc4->Pin(pin).C(L"PRG").A();
NST_VERIFY( line < 8 );
if (line < 8)
return line;
}
return def;
}
Vrc4::Vrc4(const Context& c)
:
Board (c),
irq (*c.cpu),
prgLineA (GetPrgLineShift(c,3,1)),
prgLineB (GetPrgLineShift(c,4,0))
{
}
void Vrc4::BaseIrq::Reset(bool)
{
ctrl = 0;
count[0] = 0;
count[1] = 0;
latch = 0;
}
void Vrc4::SubReset(const bool hard)
{
if (hard)
prgSwap = 0;
irq.Reset( hard, hard ? false : irq.Connected() );
if (const uint wram = board.GetWram())
Map( 0x6000U, 0x6000 + NST_MIN(wram,SIZE_8K) - 1, &Vrc4::Peek_6000, &Vrc4::Poke_6000 );
Map( 0x8000U, 0x8FFFU, &Vrc4::Poke_8000 );
Map( 0xA000U, 0xAFFFU, PRG_SWAP_8K_1 );
for (dword i=0x9000, a=9-prgLineA, b=8-prgLineB; i <= 0xFFFF; ++i)
{
switch ((i & 0xF000) | (i << a & 0x0200) | (i << b & 0x0100))
{
case 0x9000:
case 0x9100: Map( i, NMT_SWAP_VH01 ); break;
case 0x9200:
case 0x9300: Map( i, &Vrc4::Poke_9000 ); break;
case 0xB000: Map( i, &Vrc4::Poke_B000 ); break;
case 0xB100: Map( i, &Vrc4::Poke_B001 ); break;
case 0xB200: Map( i, &Vrc4::Poke_B002 ); break;
case 0xB300: Map( i, &Vrc4::Poke_B003 ); break;
case 0xC000: Map( i, &Vrc4::Poke_C000 ); break;
case 0xC100: Map( i, &Vrc4::Poke_C001 ); break;
case 0xC200: Map( i, &Vrc4::Poke_C002 ); break;
case 0xC300: Map( i, &Vrc4::Poke_C003 ); break;
case 0xD000: Map( i, &Vrc4::Poke_D000 ); break;
case 0xD100: Map( i, &Vrc4::Poke_D001 ); break;
case 0xD200: Map( i, &Vrc4::Poke_D002 ); break;
case 0xD300: Map( i, &Vrc4::Poke_D003 ); break;
case 0xE000: Map( i, &Vrc4::Poke_E000 ); break;
case 0xE100: Map( i, &Vrc4::Poke_E001 ); break;
case 0xE200: Map( i, &Vrc4::Poke_E002 ); break;
case 0xE300: Map( i, &Vrc4::Poke_E003 ); break;
case 0xF000: Map( i, &Vrc4::Poke_F000 ); break;
case 0xF100: Map( i, &Vrc4::Poke_F001 ); break;
case 0xF200: Map( i, &Vrc4::Poke_F002 ); break;
case 0xF300: Map( i, &Vrc4::Poke_F003 ); break;
}
}
}
void Vrc4::SubLoad(State::Loader& state,const dword baseChunk)
{
NST_VERIFY( (baseChunk == AsciiId<'K','V','4'>::V) );
if (baseChunk == AsciiId<'K','V','4'>::V)
{
while (const dword chunk = state.Begin())
{
switch (chunk)
{
case AsciiId<'R','E','G'>::V:
prgSwap = state.Read8() & 0x2;
break;
case AsciiId<'I','R','Q'>::V:
irq.LoadState( state );
break;
}
state.End();
}
}
}
void Vrc4::SubSave(State::Saver& state) const
{
state.Begin( AsciiId<'K','V','4'>::V );
state.Begin( AsciiId<'R','E','G'>::V ).Write8( prgSwap ).End();
irq.SaveState( state, AsciiId<'I','R','Q'>::V );
state.End();
}
void Vrc4::Irq::LoadState(State::Loader& state)
{
State::Loader::Data<5> data( state );
unit.ctrl = data[0] & (BaseIrq::ENABLE_1|BaseIrq::NO_PPU_SYNC);
Connect( data[0] & BaseIrq::ENABLE_0 );
unit.latch = data[1];
unit.count[0] = NST_MIN(340,data[2] | data[3] << 8);
unit.count[1] = data[4];
}
void Vrc4::Irq::SaveState(State::Saver& state,const dword chunk) const
{
const byte data[5] =
{
unit.ctrl | (Connected() ? BaseIrq::ENABLE_0 : 0),
unit.latch,
unit.count[0] & 0xFF,
unit.count[0] >> 8,
unit.count[1]
};
state.Begin( chunk ).Write( data ).End();
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
NES_PEEK_A(Vrc4,6000)
{
return wrk[0][address - 0x6000];
}
NES_POKE_AD(Vrc4,6000)
{
wrk[0][address - 0x6000] = data;
}
NES_POKE_D(Vrc4,8000)
{
prg.SwapBank<SIZE_8K>( prgSwap << 13, data );
}
NES_POKE_D(Vrc4,9000)
{
data &= 0x2;
if (prgSwap != data)
{
prgSwap = data;
prg.SwapPages<SIZE_8K,0x0000,0x4000>();
}
}
template<uint OFFSET>
void Vrc4::SwapChr(uint address,uint subBank) const
{
ppu.Update();
chr.SwapBank<SIZE_1K>( address, (chr.GetBank<SIZE_1K>(address) & 0xF0U >> OFFSET) | ((subBank & 0xF) << OFFSET) );
}
NES_POKE_D(Vrc4,B000) { SwapChr<0>( 0x0000, data ); }
NES_POKE_D(Vrc4,B001) { SwapChr<4>( 0x0000, data ); }
NES_POKE_D(Vrc4,B002) { SwapChr<0>( 0x0400, data ); }
NES_POKE_D(Vrc4,B003) { SwapChr<4>( 0x0400, data ); }
NES_POKE_D(Vrc4,C000) { SwapChr<0>( 0x0800, data ); }
NES_POKE_D(Vrc4,C001) { SwapChr<4>( 0x0800, data ); }
NES_POKE_D(Vrc4,C002) { SwapChr<0>( 0x0C00, data ); }
NES_POKE_D(Vrc4,C003) { SwapChr<4>( 0x0C00, data ); }
NES_POKE_D(Vrc4,D000) { SwapChr<0>( 0x1000, data ); }
NES_POKE_D(Vrc4,D001) { SwapChr<4>( 0x1000, data ); }
NES_POKE_D(Vrc4,D002) { SwapChr<0>( 0x1400, data ); }
NES_POKE_D(Vrc4,D003) { SwapChr<4>( 0x1400, data ); }
NES_POKE_D(Vrc4,E000) { SwapChr<0>( 0x1800, data ); }
NES_POKE_D(Vrc4,E001) { SwapChr<4>( 0x1800, data ); }
NES_POKE_D(Vrc4,E002) { SwapChr<0>( 0x1C00, data ); }
NES_POKE_D(Vrc4,E003) { SwapChr<4>( 0x1C00, data ); }
void Vrc4::Irq::WriteLatch0(const uint data)
{
Update();
unit.latch = (unit.latch & 0xF0) | (data << 0 & 0x0F);
}
void Vrc4::Irq::WriteLatch1(const uint data)
{
Update();
unit.latch = (unit.latch & 0x0F) | (data << 4 & 0xF0);
}
void Vrc4::Irq::Toggle(const uint data)
{
Update();
unit.ctrl = data & (BaseIrq::ENABLE_1|BaseIrq::NO_PPU_SYNC);
if (Connect( data & BaseIrq::ENABLE_0 ))
{
unit.count[0] = 0;
unit.count[1] = unit.latch;
}
ClearIRQ();
}
void Vrc4::Irq::Toggle()
{
Update();
Connect( unit.ctrl & BaseIrq::ENABLE_1 );
ClearIRQ();
}
NES_POKE_D(Vrc4,F000)
{
irq.WriteLatch0( data );
}
NES_POKE_D(Vrc4,F001)
{
irq.WriteLatch1( data );
}
NES_POKE_D(Vrc4,F002)
{
irq.Toggle( data );
}
NES_POKE(Vrc4,F003)
{
irq.Toggle();
}
bool Vrc4::BaseIrq::Clock()
{
if (!(ctrl & NO_PPU_SYNC))
{
if (count[0] < 341-3)
{
count[0] += 3;
return false;
}
count[0] -= 341-3;
}
if (count[1] != 0xFF)
{
count[1]++;
return false;
}
count[1] = latch;
return true;
}
void Vrc4::Sync(Event event,Input::Controllers* controllers)
{
if (event == EVENT_END_FRAME)
irq.VSync();
Board::Sync( event, controllers );
}
}
}
}
}