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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 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 "NstInpDevice.hpp"
#include "NstInpPowerPad.hpp"
namespace Nes
{
namespace Core
{
namespace Input
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
PowerPad::PowerPad(const Cpu& c)
: Device(c,Api::Input::POWERPAD)
{
PowerPad::Reset();
}
void PowerPad::Reset()
{
shifter = 2;
stream = 0x55FFUL << 3;
state = 0x55FFUL << 3;
}
void PowerPad::SaveState(State::Saver& saver,const byte id) const
{
saver.Begin( AsciiId<'P','P'>::R(0,0,id) ).Write8( shifter >> 1 ^ 0x1 ).Write16( stream >> 3 ^ 0x55FFU ).End();
}
void PowerPad::LoadState(State::Loader& loader,const dword id)
{
if (id == AsciiId<'P','P'>::V)
{
shifter = (~loader.Read8() & 0x1) << 1;
stream = ((loader.Read16() & 0x55FFUL) ^ 0x55FFUL) << 3;
}
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
uint PowerPad::Peek(uint)
{
const uint data = stream;
stream >>= shifter;
return ~data & 0x18;
}
void PowerPad::Poke(uint data)
{
const uint prev = shifter;
shifter = (~data & 0x1) << 1;
if (prev > shifter)
{
if (input)
{
Controllers::PowerPad& power = input->powerPad;
input = NULL;
if (Controllers::PowerPad::callback( power ))
{
static const dword lut[Controllers::PowerPad::NUM_SIDE_A_BUTTONS] =
{
( 0x02UL << 4 | 0x00UL ),
( 0x01UL << 3 | 0x00UL ),
( 0x00UL | 0x02UL << 5 ),
( 0x00UL | 0x01UL << 4 ),
( 0x04UL << 5 | 0x00UL ),
( 0x10UL << 7 | 0x00UL ),
( 0x80UL << 10 | 0x00UL ),
( 0x00UL | 0x08UL << 7 ),
( 0x08UL << 6 | 0x00UL ),
( 0x20UL << 8 | 0x00UL ),
( 0x40UL << 9 | 0x00UL ),
( 0x00UL | 0x04UL << 6 )
};
data = 0;
for (uint i=0; i < Controllers::PowerPad::NUM_SIDE_A_BUTTONS; ++i)
{
if (power.sideA[i])
data |= lut[i];
}
static const byte index[Controllers::PowerPad::NUM_SIDE_B_BUTTONS] =
{
2,1,7,6,5,4,10,9
};
for (uint i=0; i < Controllers::PowerPad::NUM_SIDE_B_BUTTONS; ++i)
{
if (power.sideB[i])
data |= lut[index[i]];
}
state = data ^ (0x55FFUL << 3);
}
}
stream = state;
}
}
}
}
}
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