www.pudn.com > Nestopia137src.zip > NstBrd64in1Nr.cpp

//////////////////////////////////////////////////////////////////////////////////////// 
// 
// Nestopia - NES/Famicom emulator written in C++ 
// 
// Copyright (C) 2003-2007 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 "../NstMapper.hpp" 
#include "NstBrd64in1Nr.hpp" 
 
namespace Nes 
{ 
	namespace Core 
	{ 
		namespace Boards 
		{ 
			#ifdef NST_MSVC_OPTIMIZE 
			#pragma optimize("s", on) 
			#endif 
 
			void Bmc64In1Nr::SubReset(bool) 
			{ 
				Map( 0x5000U, 0x5003U, &Bmc64In1Nr::Poke_5000 ); 
				Map( 0x8000U, 0xFFFFU, &Bmc64In1Nr::Poke_8000 ); 
 
				regs[0] = 0x80; 
				regs[1] = 0x43; 
				regs[2] = 0x00; 
				regs[3] = 0x00; 
 
				Update(); 
			} 
 
			void Bmc64In1Nr::SubSave(State::Saver& state) const 
			{ 
				state.Begin( AsciiId<'R','E','G'>::V ).Write( regs ).End(); 
			} 
 
			void Bmc64In1Nr::SubLoad(State::Loader& state) 
			{ 
				while (const dword chunk = state.Begin()) 
				{ 
					if (chunk == AsciiId<'R','E','G'>::V) 
						state.Read( regs ); 
 
					state.End(); 
				} 
			} 
 
			#ifdef NST_MSVC_OPTIMIZE 
			#pragma optimize("", on) 
			#endif 
 
			void Bmc64In1Nr::Update() 
			{ 
				uint bank = regs[1] & 0x1FU; 
 
				if (regs[0] & 0x80U & regs[1]) 
				{ 
					prg.SwapBank( bank ); 
				} 
				else 
				{ 
					bank = (bank << 1) | (regs[1] >> 6 & 0x1U); 
					prg.SwapBank( bank ); 
 
					if (regs[0] & 0x80U) 
						prg.SwapBank( bank ); 
				} 
 
				ppu.SetMirroring( (regs[0] & 0x20U) ? Ppu::NMT_HORIZONTAL : Ppu::NMT_VERTICAL ); 
				chr.SwapBank( (regs[2] << 2) | (regs[0] >> 1 & 0x3U) ); 
			} 
 
			NES_POKE_AD(Bmc64In1Nr,5000) 
			{ 
				regs[address & 0x3] = data; 
				Update(); 
			} 
 
			NES_POKE_D(Bmc64In1Nr,8000) 
			{ 
				regs[3] = data; 
				Update(); 
			} 
		} 
	} 
}