mirror of
https://github.com/0ldsk00l/nestopia.git
synced 2025-04-02 10:31:51 -04:00
417 lines
8.8 KiB
C++
417 lines
8.8 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 "NstBoardCony.hpp"
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#include "../NstDipSwitches.hpp"
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#include "../NstCrc32.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 Cony
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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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class Standard::CartSwitches : public DipSwitches
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{
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enum
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{
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FF2 = 0xD0350E25,
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SFXT40 = 0x1030C4EB,
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WH2 = 0x1461D1F8
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};
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uint region;
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CartSwitches()
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: region(0) {}
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public:
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static CartSwitches* Create(const Context& c)
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{
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switch (Crc32::Compute(c.prg.Mem(),c.prg.Size()))
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{
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case FF2:
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case SFXT40:
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case WH2:
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return new CartSwitches;
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}
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return NULL;
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}
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void SetRegion(uint value)
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{
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region = value ? 1 : 0;
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}
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uint GetRegion() const
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{
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return region ? 0xFF : 0x00;
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}
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private:
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uint GetValue(uint) const
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{
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return region;
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}
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void SetValue(uint,uint value)
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{
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region = value;
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}
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uint NumDips() const
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{
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return 1;
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}
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uint NumValues(uint) const
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{
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return 2;
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}
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cstring GetDipName(uint) const
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{
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return "Region";
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}
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cstring GetValueName(uint,uint i) const
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{
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return i ? "Asia" : "US";
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}
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};
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void Standard::Irq::Reset(const bool hard)
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{
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if (hard)
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{
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enabled = false;
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count = 0;
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step = 1;
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}
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}
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Standard::Standard(const Context& c)
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:
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Board (c),
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irq (*c.cpu),
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cartSwitches (CartSwitches::Create(c))
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{}
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Standard::~Standard()
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{
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delete cartSwitches;
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}
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Standard::Device Standard::QueryDevice(DeviceType type)
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{
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if (type == DEVICE_DIP_SWITCHES)
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return cartSwitches;
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else
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return Board::QueryDevice( type );
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}
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void Standard::SubReset(const bool hard)
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{
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irq.Reset( hard, true );
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if (hard)
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{
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regs.ctrl = 0;
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for (uint i=0; i < 5; ++i)
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regs.prg[i] = 0;
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regs.pr8 = 0;
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}
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UpdatePrg();
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Map( 0x5000U, &Standard::Peek_5000 );
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Map( 0x5100U, 0x51FF, &Standard::Peek_5100, &Standard::Poke_5100 );
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if (!board.GetWram())
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Map( 0x6000U, 0x7FFFU, &Standard::Peek_6000 );
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for (uint i=0x8000; i < 0x9000; i += 0x400)
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{
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Map( i+0x000, i+0x0FF, &Standard::Poke_8000 );
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Map( i+0x100, i+0x1FF, &Standard::Poke_8100 );
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for (uint j=i+0x00, n=i+0x100; j < n; j += 0x02)
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{
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Map( j+0x200, &Standard::Poke_8200 );
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Map( j+0x201, &Standard::Poke_8201 );
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}
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for (uint j=i+0x00, n=i+0x100; j < n; j += 0x20)
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{
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Map( j+0x300, j+0x30F, &Standard::Poke_8300 );
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if (chr.Source().Size() == SIZE_512K)
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{
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Map( j+0x310, j+0x311, &Standard::Poke_8310_1 );
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Map( j+0x316, j+0x317, &Standard::Poke_8310_1 );
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}
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else
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{
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Map( j+0x310, j+0x317, &Standard::Poke_8310_0 );
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}
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}
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}
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Map( 0xB000U, &Standard::Poke_8000 );
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Map( 0xB0FFU, &Standard::Poke_8000 );
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Map( 0xB100U, &Standard::Poke_8000 );
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}
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void Standard::SubLoad(State::Loader& state,const dword baseChunk)
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{
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NST_VERIFY( baseChunk == (AsciiId<'C','N','Y'>::V) );
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if (baseChunk == AsciiId<'C','N','Y'>::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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regs.ctrl = state.Read8();
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state.Read( regs.prg );
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break;
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case AsciiId<'P','R','8'>::V:
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regs.pr8 = state.Read8();
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break;
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case AsciiId<'I','R','Q'>::V:
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{
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State::Loader::Data<3> data( state );
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irq.unit.enabled = data[0] & 0x1;
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irq.unit.step = (data[0] & 0x2) ? ~0U : 1U;
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irq.unit.count = data[1] | data[2] << 8;
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break;
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}
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case AsciiId<'L','A','N'>::V:
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NST_VERIFY( cartSwitches );
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if (cartSwitches)
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cartSwitches->SetRegion( state.Read8() & 0x1 );
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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 Standard::SubSave(State::Saver& state) const
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{
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state.Begin( AsciiId<'C','N','Y'>::V );
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{
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const byte data[1+5] =
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{
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regs.ctrl,
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regs.prg[0],
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regs.prg[1],
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regs.prg[2],
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regs.prg[3],
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regs.prg[4]
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};
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state.Begin( AsciiId<'R','E','G'>::V ).Write( data ).End();
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}
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state.Begin( AsciiId<'P','R','8'>::V ).Write8( regs.pr8 ).End();
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{
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const byte data[3] =
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{
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(irq.unit.enabled ? 0x1U : 0x0U) |
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(irq.unit.step == 1 ? 0x0U : 0x2U),
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irq.unit.count & 0xFF,
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irq.unit.count >> 8
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};
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state.Begin( AsciiId<'I','R','Q'>::V ).Write( data ).End();
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}
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if (cartSwitches)
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state.Begin( AsciiId<'L','A','N'>::V ).Write8( cartSwitches->GetRegion() ? 0x1 : 0x0 ).End();
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state.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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void Standard::UpdatePrg()
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{
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if (regs.ctrl & 0x10U)
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{
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wrk.SwapBank<SIZE_8K,0x0000>( 0x1F );
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prg.SwapBanks<SIZE_8K,0x0000>( regs.prg[0], regs.prg[1] );
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prg.SwapBank<SIZE_8K,0x4000>( regs.prg[2] );
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}
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else
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{
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wrk.SwapBank<SIZE_8K,0x0000>( regs.prg[3] );
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prg.SwapBank<SIZE_16K,0x0000>( regs.prg[4] & 0x3FU );
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prg.SwapBank<SIZE_16K,0x4000>( (regs.prg[4] & 0x30U) | 0x0F );
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}
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}
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NES_PEEK(Standard,5000)
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{
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return cartSwitches ? cartSwitches->GetRegion() : 0xFF;
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}
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NES_PEEK(Standard,5100)
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{
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return regs.pr8;
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}
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NES_POKE_D(Standard,5100)
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{
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regs.pr8 = data;
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}
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NES_PEEK_A(Standard,6000)
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{
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NST_VERIFY( regs.ctrl & 0x20U );
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return (regs.ctrl & 0x20U) ? wrk[0][address - 0x6000] : address >> 8;
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}
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NES_POKE_D(Standard,8000)
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{
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if (regs.prg[4] != data)
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{
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regs.prg[4] = data;
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UpdatePrg();
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}
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}
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NES_POKE_D(Standard,8100)
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{
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const uint diff = data ^ regs.ctrl;
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regs.ctrl = data;
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if (diff & 0x10)
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UpdatePrg();
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if (diff & 0xC0)
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{
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irq.Update();
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irq.unit.step = (data & 0x40) ? ~0U : 1U;
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}
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if (diff & 0x03)
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SetMirroringVH01( data );
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}
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NES_POKE_D(Standard,8200)
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{
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irq.Update();
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irq.unit.count = (irq.unit.count & 0xFF00) | data;
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irq.ClearIRQ();
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}
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NES_POKE_D(Standard,8201)
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{
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irq.Update();
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irq.unit.count = (irq.unit.count & 0x00FF) | (data << 8);
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irq.unit.enabled = regs.ctrl & 0x80U;
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irq.ClearIRQ();
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}
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NES_POKE_AD(Standard,8310_0)
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{
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ppu.Update();
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chr.SwapBank<SIZE_1K>( (address & 0x7) << 10, (regs.prg[4] << 4 & 0x300U) | data );
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}
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NES_POKE_AD(Standard,8310_1)
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{
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ppu.Update();
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chr.SwapBank<SIZE_2K>( (address & 0x3) << 11, data );
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}
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NES_POKE_AD(Standard,8300)
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{
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data &= 0x1F;
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if (regs.prg[address & 0x3] != data)
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{
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regs.prg[address & 0x3] = data;
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UpdatePrg();
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}
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}
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bool Standard::Irq::Clock()
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{
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if (enabled && count)
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{
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count = (count + step) & 0xFFFF;
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if (!count)
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{
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enabled = false;
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return true;
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}
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}
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return false;
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}
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void Standard::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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