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https://github.com/0ldsk00l/nestopia.git
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126 lines
3 KiB
C++
126 lines
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 "NstInpDevice.hpp"
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#include "NstInpPaddle.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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Paddle::Paddle(const Cpu& c,bool p)
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: Device(c,Api::Input::PADDLE), expPort(p)
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{
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Paddle::Reset();
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}
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void Paddle::Reset()
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{
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stream[0] = 0;
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stream[1] = 0;
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shifter = 1;
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x = 0;
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button = 0;
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}
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void Paddle::SaveState(State::Saver& saver,const byte id) const
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{
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saver.Begin( AsciiId<'P','L'>::R(0,0,id) ).Write8( shifter ^ 1 ).End();
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}
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void Paddle::LoadState(State::Loader& loader,const dword id)
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{
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if (id == AsciiId<'P','L'>::V)
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shifter = ~loader.Read8() & 0x1;
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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 Paddle::Peek(uint port)
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{
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if (!expPort)
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{
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port = stream[0];
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stream[0] >>= shifter;
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return (port & 0x10) | stream[1];
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}
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else if (port)
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{
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port = stream[0];
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stream[0] >>= shifter;
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return port & 0x02;
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}
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else
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{
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return stream[1];
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}
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}
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void Paddle::Poke(uint data)
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{
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const uint prev = shifter;
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shifter = ~data & 0x1;
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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::Paddle& paddle = input->paddle;
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input = NULL;
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if (Controllers::Paddle::callback( paddle ))
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{
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data = 0xFF - ((82 + 172 * (Clamp<32,176>(paddle.x) - 32U) / 144) & 0xFF);
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x =
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(
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( data & 0x01 ) << 7 |
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( data & 0x02 ) << 5 |
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( data & 0x04 ) << 3 |
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( data & 0x08 ) << 1 |
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( data & 0x10 ) >> 1 |
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( data & 0x20 ) >> 3 |
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( data & 0x40 ) >> 5 |
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( data & 0x80 ) >> 7
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) << (expPort ? 1 : 4);
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button = (paddle.button ? expPort ? 0x2 : 0x8 : 0x0);
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}
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}
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stream[0] = x;
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stream[1] = button;
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}
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}
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}
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}
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}
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