mirror of
https://github.com/0ldsk00l/nestopia.git
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134 lines
3.5 KiB
C++
134 lines
3.5 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 "NstInpDevice.hpp"
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#include "NstInpPowerPad.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 Input
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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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PowerPad::PowerPad(const Cpu& c)
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: Device(c,Api::Input::POWERPAD)
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{
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PowerPad::Reset();
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}
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void PowerPad::Reset()
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{
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shifter = 2;
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stream = 0x55FFUL << 3;
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state = 0x55FFUL << 3;
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}
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void PowerPad::SaveState(State::Saver& saver,const byte id) const
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{
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saver.Begin( AsciiId<'P','P'>::R(0,0,id) ).Write8( shifter >> 1 ^ 0x1 ).Write16( stream >> 3 ^ 0x55FFU ).End();
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}
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void PowerPad::LoadState(State::Loader& loader,const dword id)
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{
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if (id == AsciiId<'P','P'>::V)
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{
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shifter = (~loader.Read8() & 0x1) << 1;
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stream = ((loader.Read16() & 0x55FFUL) ^ 0x55FFUL) << 3;
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}
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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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uint PowerPad::Peek(uint)
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{
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const uint data = stream;
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stream >>= shifter;
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return ~data & 0x18;
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}
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void PowerPad::Poke(uint data)
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{
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const uint prev = shifter;
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shifter = (~data & 0x1) << 1;
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if (prev > shifter)
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{
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if (input)
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{
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Controllers::PowerPad& power = input->powerPad;
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input = NULL;
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if (Controllers::PowerPad::callback( power ))
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{
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static const dword lut[Controllers::PowerPad::NUM_SIDE_A_BUTTONS] =
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{
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( 0x02UL << 4 | 0x00UL ),
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( 0x01UL << 3 | 0x00UL ),
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( 0x00UL | 0x02UL << 5 ),
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( 0x00UL | 0x01UL << 4 ),
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( 0x04UL << 5 | 0x00UL ),
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( 0x10UL << 7 | 0x00UL ),
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( 0x80UL << 10 | 0x00UL ),
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( 0x00UL | 0x08UL << 7 ),
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( 0x08UL << 6 | 0x00UL ),
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( 0x20UL << 8 | 0x00UL ),
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( 0x40UL << 9 | 0x00UL ),
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( 0x00UL | 0x04UL << 6 )
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};
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data = 0;
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for (uint i=0; i < Controllers::PowerPad::NUM_SIDE_A_BUTTONS; ++i)
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{
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if (power.sideA[i])
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data |= lut[i];
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}
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static const byte index[Controllers::PowerPad::NUM_SIDE_B_BUTTONS] =
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{
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2,1,7,6,5,4,10,9
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};
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for (uint i=0; i < Controllers::PowerPad::NUM_SIDE_B_BUTTONS; ++i)
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{
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if (power.sideB[i])
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data |= lut[index[i]];
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}
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state = data ^ (0x55FFUL << 3);
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}
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}
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stream = state;
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}
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}
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}
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}
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}
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