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/*
* Gearboy - Nintendo Game Boy Emulator
* Copyright (C) 2012 Ignacio Sanchez
* This program 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 3 of the License, or
* any later version.
* This program 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 this program. If not, see http://www.gnu.org/licenses/
*
*/
#include "Input.h"
#include "Memory.h"
#include "Processor.h"
Input::Input(Memory* pMemory, Processor* pProcessor)
{
m_pMemory = pMemory;
m_pProcessor = pProcessor;
m_JoypadState = 0xFF;
m_P1 = 0xFF;
m_iInputCycles = 0;
}
void Input::Init()
{
Reset();
}
void Input::Reset()
{
m_JoypadState = 0xFF;
m_P1 = 0xFF;
m_iInputCycles = 0;
}
void Input::KeyPressed(Gameboy_Keys key)
{
m_JoypadState = UnsetBit(m_JoypadState, key);
}
void Input::KeyReleased(Gameboy_Keys key)
{
m_JoypadState = SetBit(m_JoypadState, key);
}
void Input::Update()
{
u8 current = m_P1 & 0xF0;
switch (current & 0x30)
{
case 0x10:
{
u8 topJoypad = (m_JoypadState >> 4) & 0x0F;
current |= topJoypad;
break;
}
case 0x20:
{
u8 bottomJoypad = m_JoypadState & 0x0F;
current |= bottomJoypad;
break;
}
case 0x30:
current |= 0x0F;
break;
}
if ((m_P1 & ~current & 0x0F) != 0)
m_pProcessor->RequestInterrupt(Processor::Joypad_Interrupt);
m_P1 = current;
}
void Input::SaveState(std::ostream& stream)
{
using namespace std;
stream.write(reinterpret_cast<const char*> (&m_JoypadState), sizeof(m_JoypadState));
stream.write(reinterpret_cast<const char*> (&m_P1), sizeof(m_P1));
stream.write(reinterpret_cast<const char*> (&m_iInputCycles), sizeof(m_iInputCycles));
}
void Input::LoadState(std::istream& stream)
{
using namespace std;
stream.read(reinterpret_cast<char*> (&m_JoypadState), sizeof(m_JoypadState));
stream.read(reinterpret_cast<char*> (&m_P1), sizeof(m_P1));
stream.read(reinterpret_cast<char*> (&m_iInputCycles), sizeof(m_iInputCycles));
}
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