73 lines
2.0 KiB
Rust
73 lines
2.0 KiB
Rust
mod cartridge;
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mod bus;
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mod cpu;
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mod mapper;
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mod palette;
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mod render;
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mod ppu;
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use crate::bus::{Bus, NesBus};
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use crate::cartridge::Cartridge;
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use crate::cpu::Cpu;
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use crate::render::{PpmRenderer, Renderer};
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fn main() {
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let args: Vec<String> = std::env::args().collect();
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match args.len() {
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1 => run_nestest(),
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3 if args[1] == "blargg" => run_blargg(&args[2]),
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2 => run_cart(&args[1]),
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_ => eprintln!("usage: rnes [<rom> | blargg <rom>]"),
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}
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}
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fn run_cart(path: &str) {
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let cart = Cartridge::from_file(path).unwrap();
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let mut bus = NesBus::new(cart);
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let mut cpu = Cpu::new();
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cpu.reset(&mut bus);
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let mut renderer = PpmRenderer::new();
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let frames: u32 = 60;
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for _ in 0..frames {
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while !bus.frame_done() {
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let cycles = cpu.step(&mut bus);
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bus.tick_ppu(cycles as u64);
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}
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if bus.take_nmi() { cpu.set_nmi(); }
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renderer.present(bus.framebuffer(), 256, 240);
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bus.begin_frame();
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}
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}
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fn run_blargg(path: &str) {
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let cart = Cartridge::from_file(path).unwrap();
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let mut bus = NesBus::new(cart);
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let mut cpu = Cpu::new();
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cpu.reset(&mut bus); // boots from $FFFC-$FFFD via MMC1 PRG banking
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let cycle_cap: u64 = 5_000_000; // blargg tests complete well under this; tune if needed
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while cpu.cycles < cycle_cap {
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cpu.step(&mut bus);
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}
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let r0 = bus.read(0x6000);
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let r1 = bus.read(0x6001);
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let r2 = bus.read(0x6002);
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let r3 = bus.read(0x6003);
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println!("result: $6000={:02X} $6001={:02X} $6002={:02X} $6003={:02X}", r0, r1, r2, r3);
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if r0 == 0 { println!("PASS"); } else { println!("FAIL (error {:#04X})", r0); }
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}
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fn run_nestest() {
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let cart: Cartridge = Cartridge::from_file("roms/test/cpu/nestest/nestest.nes").unwrap();
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let mut bus: NesBus = NesBus::new(cart);
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let mut cpu = Cpu::new();
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cpu.set_test_start(0xC000, 7);
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loop {
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println!("{}", cpu.trace(&mut bus));
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cpu.step(&mut bus);
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}
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}
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