mirror of
https://github.com/0ldsk00l/nestopia.git
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158 lines
4.1 KiB
C++
158 lines
4.1 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 "NstBoard.hpp"
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#include "NstBoardSachenS8259.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 Sachen
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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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void S8259::SubReset(const bool hard)
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{
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for (uint i=0x4100; i < 0x8000; i += 0x200)
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{
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for (uint j=0; j < 0x100; j += 0x2)
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{
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Map( i + j + 0x0, &S8259::Poke_4100 );
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Map( i + j + 0x1, &S8259::Poke_4101 );
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}
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}
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if (hard)
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{
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ctrl = 0;
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for (uint i=0; i < 8; ++i)
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regs[i] = 0;
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prg.SwapBank<SIZE_32K,0x0000>(0);
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}
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if (board == Type::SACHEN_8259D && !chr.Source().Writable())
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chr.SwapBank<SIZE_4K,0x1000>( ~0U );
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}
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void S8259::SubLoad(State::Loader& state,const dword baseChunk)
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{
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NST_VERIFY( baseChunk == (AsciiId<'S','8','2'>::V) );
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if (baseChunk == AsciiId<'S','8','2'>::V)
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{
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while (const dword chunk = state.Begin())
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{
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if (chunk == AsciiId<'R','E','G'>::V)
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{
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ctrl = state.Read8();
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state.Read( regs );
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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 S8259::SubSave(State::Saver& state) const
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{
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state.Begin( AsciiId<'S','8','2'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write8( ctrl ).Write( regs ).End().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_POKE_D(S8259,4100)
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{
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ctrl = data;
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}
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NES_POKE_D(S8259,4101)
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{
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regs[ctrl & 0x7] = data;
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switch (ctrl & 0x7)
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{
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case 0x5:
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prg.SwapBank<SIZE_32K,0x0000>( data );
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break;
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case 0x7:
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{
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static const byte lut[4][4] =
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{
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{0,1,0,1},
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{0,0,1,1},
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{0,1,1,1},
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{0,0,0,0}
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};
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ppu.SetMirroring( lut[(data & 0x1) ? 0 : (data >> 1 & 0x3)] );
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}
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default:
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if (!chr.Source().Writable())
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{
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ppu.Update();
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if (board == Type::SACHEN_8259D)
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{
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chr.SwapBanks<SIZE_1K,0x0000>
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(
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(regs[0] & 0x07U),
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(regs[1] & 0x07U) | (regs[4] << 4 & 0x10U),
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(regs[2] & 0x07U) | (regs[4] << 3 & 0x10U),
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(regs[3] & 0x07U) | (regs[4] << 2 & 0x10U) | (regs[6] << 3 & 0x08U)
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);
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}
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else
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{
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const uint h = regs[4] << 3 & 0x38U;
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const uint s = (board == Type::SACHEN_8259A ? 1 : board == Type::SACHEN_8259C ? 2 : 0);
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chr.SwapBanks<SIZE_2K,0x0000>
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(
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((regs[(regs[7] & 0x1U) ? 0 : 0] & 0x07U) | h) << s,
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((regs[(regs[7] & 0x1U) ? 0 : 1] & 0x07U) | h) << s | (board != Type::SACHEN_8259B ? 1 : 0),
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((regs[(regs[7] & 0x1U) ? 0 : 2] & 0x07U) | h) << s | (board == Type::SACHEN_8259C ? 2 : 0),
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((regs[(regs[7] & 0x1U) ? 0 : 3] & 0x07U) | h) << s | (board == Type::SACHEN_8259A ? 1 : board == Type::SACHEN_8259C ? 3 : 0)
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);
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}
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}
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break;
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}
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}
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}
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}
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}
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}
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