mirror of
https://github.com/0ldsk00l/nestopia.git
synced 2025-04-02 10:31:51 -04:00
319 lines
8.3 KiB
C++
319 lines
8.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////////////
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//
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// Nestopia - NES/Famicom emulator written in C++
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//
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// Copyright (C) 2003-2008 Martin Freij
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//
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// This file is part of Nestopia.
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//
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// Nestopia is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Nestopia is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Nestopia; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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////////////////////////////////////////////////////////////////////////////////////////
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#include "../NstTimer.hpp"
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#include "NstBoard.hpp"
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#include "NstBoardKonamiVrc4.hpp"
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namespace Nes
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{
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namespace Core
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{
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namespace Boards
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{
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namespace Konami
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{
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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("s", on)
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#endif
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uint Vrc4::GetPrgLineShift(const Context& c,const uint pin,const uint def)
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{
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if (const Chips::Type* const vrc4 = c.chips.Find(L"Konami VRC IV"))
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{
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const uint line = *vrc4->Pin(pin).C(L"PRG").A();
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NST_VERIFY( line < 8 );
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if (line < 8)
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return line;
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}
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return def;
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}
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Vrc4::Vrc4(const Context& c)
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:
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Board (c),
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irq (*c.cpu),
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prgLineA (GetPrgLineShift(c,3,1)),
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prgLineB (GetPrgLineShift(c,4,0))
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{
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}
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void Vrc4::BaseIrq::Reset(bool)
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{
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ctrl = 0;
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count[0] = 0;
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count[1] = 0;
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latch = 0;
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}
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void Vrc4::SubReset(const bool hard)
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{
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if (hard)
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prgSwap = 0;
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irq.Reset( hard, hard ? false : irq.Connected() );
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if (const uint wram = board.GetWram())
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Map( 0x6000U, 0x6000 + NST_MIN(wram,SIZE_8K) - 1, &Vrc4::Peek_6000, &Vrc4::Poke_6000 );
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Map( 0x8000U, 0x8FFFU, &Vrc4::Poke_8000 );
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Map( 0xA000U, 0xAFFFU, PRG_SWAP_8K_1 );
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for (dword i=0x9000, a=9-prgLineA, b=8-prgLineB; i <= 0xFFFF; ++i)
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{
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switch ((i & 0xF000) | (i << a & 0x0200) | (i << b & 0x0100))
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{
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case 0x9000:
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case 0x9100: Map( i, NMT_SWAP_VH01 ); break;
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case 0x9200:
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case 0x9300: Map( i, &Vrc4::Poke_9000 ); break;
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case 0xB000: Map( i, &Vrc4::Poke_B000 ); break;
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case 0xB100: Map( i, &Vrc4::Poke_B001 ); break;
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case 0xB200: Map( i, &Vrc4::Poke_B002 ); break;
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case 0xB300: Map( i, &Vrc4::Poke_B003 ); break;
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case 0xC000: Map( i, &Vrc4::Poke_C000 ); break;
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case 0xC100: Map( i, &Vrc4::Poke_C001 ); break;
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case 0xC200: Map( i, &Vrc4::Poke_C002 ); break;
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case 0xC300: Map( i, &Vrc4::Poke_C003 ); break;
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case 0xD000: Map( i, &Vrc4::Poke_D000 ); break;
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case 0xD100: Map( i, &Vrc4::Poke_D001 ); break;
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case 0xD200: Map( i, &Vrc4::Poke_D002 ); break;
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case 0xD300: Map( i, &Vrc4::Poke_D003 ); break;
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case 0xE000: Map( i, &Vrc4::Poke_E000 ); break;
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case 0xE100: Map( i, &Vrc4::Poke_E001 ); break;
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case 0xE200: Map( i, &Vrc4::Poke_E002 ); break;
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case 0xE300: Map( i, &Vrc4::Poke_E003 ); break;
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case 0xF000: Map( i, &Vrc4::Poke_F000 ); break;
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case 0xF100: Map( i, &Vrc4::Poke_F001 ); break;
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case 0xF200: Map( i, &Vrc4::Poke_F002 ); break;
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case 0xF300: Map( i, &Vrc4::Poke_F003 ); break;
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}
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}
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}
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void Vrc4::SubLoad(State::Loader& state,const dword baseChunk)
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{
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NST_VERIFY( (baseChunk == AsciiId<'K','V','4'>::V) );
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if (baseChunk == AsciiId<'K','V','4'>::V)
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{
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while (const dword chunk = state.Begin())
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{
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switch (chunk)
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{
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case AsciiId<'R','E','G'>::V:
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prgSwap = state.Read8() & 0x2;
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break;
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case AsciiId<'I','R','Q'>::V:
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irq.LoadState( state );
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break;
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}
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state.End();
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}
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}
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}
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void Vrc4::SubSave(State::Saver& state) const
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{
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state.Begin( AsciiId<'K','V','4'>::V );
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state.Begin( AsciiId<'R','E','G'>::V ).Write8( prgSwap ).End();
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irq.SaveState( state, AsciiId<'I','R','Q'>::V );
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state.End();
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}
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void Vrc4::Irq::LoadState(State::Loader& state)
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{
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State::Loader::Data<5> data( state );
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unit.ctrl = data[0] & (BaseIrq::ENABLE_1|BaseIrq::NO_PPU_SYNC);
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Connect( data[0] & BaseIrq::ENABLE_0 );
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unit.latch = data[1];
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unit.count[0] = NST_MIN(340,data[2] | data[3] << 8);
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unit.count[1] = data[4];
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}
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void Vrc4::Irq::SaveState(State::Saver& state,const dword chunk) const
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{
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const byte data[5] =
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{
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unit.ctrl | (Connected() ? BaseIrq::ENABLE_0 : 0),
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unit.latch,
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unit.count[0] & 0xFF,
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unit.count[0] >> 8,
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unit.count[1]
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};
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state.Begin( chunk ).Write( data ).End();
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}
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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("", on)
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#endif
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NES_PEEK_A(Vrc4,6000)
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{
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return wrk[0][address - 0x6000];
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}
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NES_POKE_AD(Vrc4,6000)
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{
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wrk[0][address - 0x6000] = data;
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}
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NES_POKE_D(Vrc4,8000)
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{
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prg.SwapBank<SIZE_8K>( prgSwap << 13, data );
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}
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NES_POKE_D(Vrc4,9000)
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{
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data &= 0x2;
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if (prgSwap != data)
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{
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prgSwap = data;
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prg.SwapPages<SIZE_8K,0x0000,0x4000>();
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}
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}
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template<uint OFFSET>
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void Vrc4::SwapChr(uint address,uint subBank) const
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{
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ppu.Update();
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chr.SwapBank<SIZE_1K>( address, (chr.GetBank<SIZE_1K>(address) & 0xF0U >> OFFSET) | ((subBank & 0xF) << OFFSET) );
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}
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NES_POKE_D(Vrc4,B000) { SwapChr<0>( 0x0000, data ); }
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NES_POKE_D(Vrc4,B001) { SwapChr<4>( 0x0000, data ); }
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NES_POKE_D(Vrc4,B002) { SwapChr<0>( 0x0400, data ); }
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NES_POKE_D(Vrc4,B003) { SwapChr<4>( 0x0400, data ); }
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NES_POKE_D(Vrc4,C000) { SwapChr<0>( 0x0800, data ); }
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NES_POKE_D(Vrc4,C001) { SwapChr<4>( 0x0800, data ); }
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NES_POKE_D(Vrc4,C002) { SwapChr<0>( 0x0C00, data ); }
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NES_POKE_D(Vrc4,C003) { SwapChr<4>( 0x0C00, data ); }
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NES_POKE_D(Vrc4,D000) { SwapChr<0>( 0x1000, data ); }
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NES_POKE_D(Vrc4,D001) { SwapChr<4>( 0x1000, data ); }
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NES_POKE_D(Vrc4,D002) { SwapChr<0>( 0x1400, data ); }
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NES_POKE_D(Vrc4,D003) { SwapChr<4>( 0x1400, data ); }
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NES_POKE_D(Vrc4,E000) { SwapChr<0>( 0x1800, data ); }
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NES_POKE_D(Vrc4,E001) { SwapChr<4>( 0x1800, data ); }
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NES_POKE_D(Vrc4,E002) { SwapChr<0>( 0x1C00, data ); }
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NES_POKE_D(Vrc4,E003) { SwapChr<4>( 0x1C00, data ); }
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void Vrc4::Irq::WriteLatch0(const uint data)
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{
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Update();
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unit.latch = (unit.latch & 0xF0) | (data << 0 & 0x0F);
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}
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void Vrc4::Irq::WriteLatch1(const uint data)
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{
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Update();
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unit.latch = (unit.latch & 0x0F) | (data << 4 & 0xF0);
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}
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void Vrc4::Irq::Toggle(const uint data)
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{
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Update();
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unit.ctrl = data & (BaseIrq::ENABLE_1|BaseIrq::NO_PPU_SYNC);
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if (Connect( data & BaseIrq::ENABLE_0 ))
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{
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unit.count[0] = 0;
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unit.count[1] = unit.latch;
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}
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ClearIRQ();
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}
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void Vrc4::Irq::Toggle()
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{
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Update();
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Connect( unit.ctrl & BaseIrq::ENABLE_1 );
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ClearIRQ();
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}
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NES_POKE_D(Vrc4,F000)
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{
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irq.WriteLatch0( data );
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}
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NES_POKE_D(Vrc4,F001)
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{
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irq.WriteLatch1( data );
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}
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NES_POKE_D(Vrc4,F002)
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{
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irq.Toggle( data );
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}
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NES_POKE(Vrc4,F003)
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{
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irq.Toggle();
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}
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bool Vrc4::BaseIrq::Clock()
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{
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if (!(ctrl & NO_PPU_SYNC))
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{
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if (count[0] < 341-3)
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{
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count[0] += 3;
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return false;
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}
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count[0] -= 341-3;
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}
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if (count[1] != 0xFF)
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{
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count[1]++;
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return false;
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}
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count[1] = latch;
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return true;
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}
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void Vrc4::Sync(Event event,Input::Controllers* controllers)
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{
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if (event == EVENT_END_FRAME)
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irq.VSync();
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Board::Sync( event, controllers );
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}
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}
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}
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}
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}
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