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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/
*
*/
#ifndef COMMONMEMORYRULE_H
#define COMMONMEMORYRULE_H
#include "definitions.h"
class Memory;
class CommonMemoryRule
{
public:
CommonMemoryRule(Memory* pMemory);
~CommonMemoryRule();
u8 PerformRead(u16 address);
void PerformWrite(u16 address, u8 value);
void Reset(bool bCGB);
private:
Memory* m_pMemory;
bool m_bCGB;
};
#include "Memory.h"
inline u8 CommonMemoryRule::PerformRead(u16 address)
{
if (m_bCGB)
{
switch (address & 0xE000)
{
case 0x8000:
{
return m_pMemory->ReadCGBLCDRAM(address, false);
}
case 0xC000:
{
return m_pMemory->ReadCGBWRAM(address);
}
}
}
else if (address >= 0xFEA0 && address < 0xFF00)
{
return ((((address + ((address >> 4) - 0x0FEA)) >> 2) & 1) ? 0x00 : 0xFF);
}
return m_pMemory->Retrieve(address);
}
inline void CommonMemoryRule::PerformWrite(u16 address, u8 value)
{
switch (address & 0xE000)
{
case 0x8000:
{
if (m_bCGB)
m_pMemory->WriteCGBLCDRAM(address, value);
else
m_pMemory->Load(address, value);
break;
}
case 0xC000:
{
if (address < 0xDE00)
{
if (m_bCGB)
m_pMemory->WriteCGBWRAM(address, value);
else
m_pMemory->Load(address, value);
m_pMemory->Load(address + 0x2000, value);
}
else if (m_bCGB)
{
m_pMemory->WriteCGBWRAM(address, value);
}
else
{
m_pMemory->Load(address, value);
}
break;
}
case 0xE000:
{
if (address < 0xFE00)
{
if (m_bCGB)
m_pMemory->WriteCGBWRAM(address - 0x2000, value);
else
m_pMemory->Load(address - 0x2000, value);
m_pMemory->Load(address, value);
}
else
{
m_pMemory->Load(address, value);
}
break;
}
default:
{
Log("--> ** Writing to invalid area %X %X", address, value);
m_pMemory->Load(address, value);
}
}
}
#endif /* COMMONMEMORYRULE_H */
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