86 lines
2.4 KiB
Rust
86 lines
2.4 KiB
Rust
use super::{serialize::*, Cartridge, Mapper, Mirror};
|
|
|
|
pub struct Uxrom {
|
|
cart: Cartridge,
|
|
chr_ram: Vec<u8>,
|
|
bank_select: usize,
|
|
}
|
|
|
|
impl Uxrom {
|
|
pub fn new(cart: Cartridge) -> Self {
|
|
Uxrom {
|
|
cart: cart,
|
|
chr_ram: vec![0; 0x2000],
|
|
bank_select: 0,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Mapper for Uxrom {
|
|
fn read(&self, address: usize) -> u8 {
|
|
match address {
|
|
0x0000..=0x1FFF => {
|
|
if self.cart.chr_rom_size > 0 {
|
|
self.cart.chr_rom[0][address]
|
|
} else {
|
|
self.chr_ram[address]
|
|
}
|
|
}
|
|
0x8000..=0xBFFF => {
|
|
let address = address % 0x4000;
|
|
if self.bank_select > self.cart.prg_rom.len() {
|
|
return 0;
|
|
}
|
|
match self.cart.prg_rom[self.bank_select].get(address) {
|
|
None => 0,
|
|
Some(x) => *x,
|
|
}
|
|
}
|
|
0xC000..=0xFFFF => self.cart.prg_rom[self.cart.prg_rom.len() - 1][address % 0x4000],
|
|
_ => {
|
|
println!("bad address read from UxROM mapper: 0x{:X}", address);
|
|
0
|
|
}
|
|
}
|
|
}
|
|
|
|
fn write(&mut self, address: usize, value: u8) {
|
|
match address {
|
|
0x0000..=0x1FFF => {
|
|
if self.cart.chr_rom_size == 0 {
|
|
self.chr_ram[address] = value;
|
|
}
|
|
}
|
|
0x8000..=0xFFFF => self.bank_select = value as usize,
|
|
_ => println!("bad address written to UxROM mapper: 0x{:X}", address),
|
|
}
|
|
}
|
|
|
|
fn get_mirroring(&self) -> Mirror {
|
|
self.cart.mirroring
|
|
}
|
|
|
|
fn load_battery_backed_ram(&mut self) {}
|
|
fn save_battery_backed_ram(&self) {}
|
|
fn clock(&mut self) {}
|
|
fn check_irq(&mut self) -> bool {
|
|
false
|
|
}
|
|
|
|
fn save_state(&self) -> MapperData {
|
|
MapperData::Uxrom(UxromData {
|
|
cart: self.cart.clone(),
|
|
chr_ram: self.chr_ram.clone(),
|
|
bank_select: self.bank_select,
|
|
})
|
|
}
|
|
|
|
fn load_state(&mut self, mapper_data: MapperData) {
|
|
if let MapperData::Uxrom(uxrom_data) = mapper_data {
|
|
self.cart = uxrom_data.cart;
|
|
self.chr_ram = uxrom_data.chr_ram;
|
|
self.bank_select = uxrom_data.bank_select;
|
|
}
|
|
}
|
|
}
|