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|
extern crate core;
mod memory;
mod mos6502;
mod ppu;
mod cartridge;
mod mapper;
use std::fs::File;
use std::io::Read;
use core::cell::RefCell;
use core::intrinsics::transmute;
use cartridge::*;
extern crate sdl2;
use sdl2::pixels::Color;
use sdl2::rect::Rect;
struct Window {
buff: RefCell<[[u8; 256]; 240]>
}
impl ppu::Screen for Window {
fn put(&self, x: u8, y: u8, color: u8) {
self.buff.borrow_mut()[y as usize][x as usize] = color;
}
fn render(&self) {
println!("a frame has been redrawn:");
for r in self.buff.borrow().iter() {
for c in r.iter() {
print!("{:02x}", c);
}
println!("");
}
}
}
struct SDLWindow {
canvas: RefCell<sdl2::render::WindowCanvas>
}
impl SDLWindow {
fn new() -> Self {
let sdl_context = sdl2::init().unwrap();
let video_subsystem = sdl_context.video().unwrap();
let window = video_subsystem.window("rust-sdl2 demo: Video", 256 * PIXEL_SIZE, 240 * PIXEL_SIZE)
.position_centered()
.opengl()
.build()
.unwrap();
let mut canvas = window.into_canvas().build().unwrap();
canvas.set_draw_color(Color::RGB(255, 255, 255));
canvas.clear();
canvas.present();
SDLWindow {
canvas: RefCell::new(canvas)
}
}
}
const PIXEL_SIZE: u32 = 2;
const COLORS: [u32; 64] = [
0x666666, 0x002A88, 0x1412A7, 0x3B00A4, 0x5C007E, 0x6E0040, 0x6C0600, 0x561D00,
0x333500, 0x0B4800, 0x005200, 0x004F08, 0x00404D, 0x000000, 0x000000, 0x000000,
0xADADAD, 0x155FD9, 0x4240FF, 0x7527FE, 0xA01ACC, 0xB71E7B, 0xB53120, 0x994E00,
0x6B6D00, 0x388700, 0x0C9300, 0x008F32, 0x007C8D, 0x000000, 0x000000, 0x000000,
0xFFFEFF, 0x64B0FF, 0x9290FF, 0xC676FF, 0xF36AFF, 0xFE6ECC, 0xFE8170, 0xEA9E22,
0xBCBE00, 0x88D800, 0x5CE430, 0x45E082, 0x48CDDE, 0x4F4F4F, 0x000000, 0x000000,
0xFFFEFF, 0xC0DFFF, 0xD3D2FF, 0xE8C8FF, 0xFBC2FF, 0xFEC4EA, 0xFECCC5, 0xF7D8A5,
0xE4E594, 0xCFEF96, 0xBDF4AB, 0xB3F3CC, 0xB5EBF2, 0xB8B8B8, 0x000000, 0x000000,
];
fn get_rgb(color: u8) -> Color {
let c = COLORS[color as usize];
Color::RGB((c >> 16) as u8, ((c >> 8) & 0xff) as u8, (c & 0xff) as u8)
}
impl ppu::Screen for SDLWindow {
fn put(&self, x: u8, y: u8, color: u8) {
let mut canvas = self.canvas.borrow_mut();
println!("put {} at {}, {}", color, x, y);
canvas.set_draw_color(get_rgb(color));
canvas.draw_rect(Rect::new((x as u32 * PIXEL_SIZE) as i32,
(y as u32 * PIXEL_SIZE) as i32,
PIXEL_SIZE, PIXEL_SIZE));
}
fn render(&self) {
let mut canvas = self.canvas.borrow_mut();
canvas.present();
canvas.clear();
}
}
#[repr(C, packed)]
struct INesHeader {
magic: [u8; 4],
prg_rom_nbanks: u8,
chr_rom_nbanks: u8,
flags6: u8,
flags7: u8,
prg_ram_nbanks: u8,
flags9: u8,
flags10: u8,
padding: [u8; 5]
}
fn main() {
let fname = std::env::args().nth(1).unwrap();
let mut file = File::open(fname).unwrap();
let mut rheader = [0; 16];
println!("read {}", file.read(&mut rheader[..]).unwrap());
let header = unsafe{transmute::<[u8; 16], INesHeader>(rheader)};
let mirror = match ((header.flags6 >> 2) & 2) | (header.flags6 & 1) {
0 => MirrorType::Horizontal,
1 => MirrorType::Vertical,
2 => MirrorType::Single0,
3 => MirrorType::Single1,
_ => MirrorType::Four,
};
let mapper_id = (header.flags7 & 0xf0) | (header.flags6 >> 4);
println!("maigc:{} prg:{} chr:{} mirror:{} mapper:{}",
std::str::from_utf8(&header.magic).unwrap(),
header.prg_rom_nbanks,
header.chr_rom_nbanks,
mirror as u8,
mapper_id);
if header.flags6 & 0x04 == 0x04 {
let mut trainer: [u8; 512] = unsafe{std::mem::uninitialized()};
file.read(&mut trainer[..]);
println!("skipping trainer");
}
let prg_len = header.prg_rom_nbanks as usize * 0x4000;
let mut chr_len = header.chr_rom_nbanks as usize * 0x2000;
if chr_len == 0 {
chr_len = 0x2000;
}
let mut prg_rom = Vec::<u8>::with_capacity(prg_len);
let mut chr_rom = Vec::<u8>::with_capacity(chr_len);
unsafe {
prg_rom.set_len(prg_len);
chr_rom.set_len(chr_len);
}
let sram = vec![0; 0x4000];
println!("read prg {}", file.read(&mut prg_rom[..]).unwrap());
for (i, v) in prg_rom.iter().enumerate() {
print!("{:02x} ", v);
if i & 15 == 15 {
println!(" {:04x}", i);
}
}
println!("read chr {}", file.read(&mut chr_rom[..]).unwrap());
for (i, v) in chr_rom.iter().enumerate() {
print!("{:02x} ", v);
if i & 15 == 15 {
println!("");
}
}
let cart = cartridge::Cartridge::new(chr_rom, prg_rom, sram, mirror);
//let win = Window {buff: RefCell::new([[0; 256]; 240])};
let win = SDLWindow::new();
let mapper = mapper::Mapper2::new(&cart);
let pmem = memory::PPUMemory::new(&mapper, &cart);
let mem = memory::CPUMemory::new(&mapper);
let mut ppu = ppu::PPU::new(&pmem, &win);
let mut cpu = mos6502::CPU::new(&mem);
mem.init(&mut cpu, &mut ppu);
loop {
cpu.step();
//println!("cpu at 0x{:04x}", cpu.get_pc());
while cpu.cycle > 0 {
for _ in 0..3 {
if ppu.tick() {
println!("triggering nmi");
cpu.trigger_nmi();
}
}
cpu.cycle -= 1;
}
}
}
|