120 lines
2.8 KiB
C++
120 lines
2.8 KiB
C++
/* Copyright notice for this file:
|
|
* Copyright (C) 2018
|
|
*
|
|
* 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 2 of the License, or
|
|
* (at your option) 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, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* This mapper was added by retrowertz for Libretro port of QuickNES.
|
|
*
|
|
* Mapper 32 - Irem's G-101
|
|
*
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "Nes_Mapper.h"
|
|
|
|
struct mapper32_state_t
|
|
{
|
|
uint8_t chr_bank [ 8 ];
|
|
uint8_t prg_bank [ 2 ];
|
|
uint8_t prg_mode;
|
|
uint8_t mirr;
|
|
};
|
|
|
|
BOOST_STATIC_ASSERT( sizeof ( mapper32_state_t ) == 12 );
|
|
|
|
// Irem_G101
|
|
|
|
class Mapper032 : public Nes_Mapper, mapper32_state_t {
|
|
public:
|
|
Mapper032()
|
|
{
|
|
mapper32_state_t * state = this;
|
|
register_state( state, sizeof * state );
|
|
}
|
|
|
|
virtual void reset_state()
|
|
{
|
|
prg_bank [ 0 ] = ~1;
|
|
prg_bank [ 1 ] = ~0;
|
|
enable_sram();
|
|
}
|
|
|
|
virtual void apply_mapping()
|
|
{
|
|
if ( prg_mode == 0 )
|
|
{
|
|
set_prg_bank ( 0x8000, bank_8k, prg_bank [ 0 ] );
|
|
set_prg_bank ( 0xA000, bank_8k, prg_bank [ 1 ] );
|
|
set_prg_bank ( 0xC000, bank_8k, ~1 );
|
|
set_prg_bank ( 0xE000, bank_8k, ~0 );
|
|
}
|
|
else
|
|
{
|
|
set_prg_bank ( 0xC000, bank_8k, prg_bank [ 0 ] );
|
|
set_prg_bank ( 0xA000, bank_8k, prg_bank [ 1 ] );
|
|
set_prg_bank ( 0x8000, bank_8k, ~1 );
|
|
set_prg_bank ( 0xE000, bank_8k, ~0 );
|
|
}
|
|
|
|
for ( unsigned long int i = 0; i < sizeof chr_bank; i++)
|
|
set_chr_bank( ( i << 10 ), bank_1k, chr_bank [ i ] );
|
|
|
|
switch ( mirr )
|
|
{
|
|
case 0: mirror_vert(); break;
|
|
case 1: mirror_horiz(); break;
|
|
}
|
|
}
|
|
|
|
virtual void write( nes_time_t, nes_addr_t addr, int data )
|
|
{
|
|
switch ( addr & 0xF000 )
|
|
{
|
|
case 0x8000:
|
|
prg_bank [ 0 ] = data;
|
|
switch ( prg_mode )
|
|
{
|
|
case 0: set_prg_bank ( 0x8000, bank_8k, data ); break;
|
|
case 1: set_prg_bank ( 0xC000, bank_8k, data ); break;
|
|
}
|
|
break;
|
|
case 0x9000:
|
|
mirr = data & 1;
|
|
prg_mode = ( data >> 1 ) & 1;
|
|
switch ( data & 1 )
|
|
{
|
|
case 0: mirror_vert(); break;
|
|
case 1: mirror_horiz(); break;
|
|
}
|
|
break;
|
|
case 0xA000:
|
|
prg_bank [ 1 ] = data;
|
|
set_prg_bank ( 0xA000, bank_8k, data );
|
|
break;
|
|
}
|
|
|
|
switch ( addr & 0xF007 )
|
|
{
|
|
case 0xB000: case 0xB001: case 0xB002: case 0xB003:
|
|
case 0xB004: case 0xB005: case 0xB006: case 0xB007:
|
|
chr_bank [ addr & 0x07 ] = data;
|
|
set_chr_bank( ( addr & 0x07 ) << 10, bank_1k, data );
|
|
break;
|
|
}
|
|
}
|
|
};
|
|
|