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|
pub mod audio;
pub mod consts;
pub mod display;
pub mod gamepad;
pub mod interrupts_timers;
pub mod io;
pub mod opcodes;
pub mod serial;
pub mod state;
pub mod window;
use crate::gamepad::{Gamepad, GamepadRecorder, GamepadReplay, Input, Keyboard};
use crate::state::GBState;
use clap::Parser;
use std::time::SystemTime;
use std::{thread, time};
#[derive(Parser)]
#[command(author, version, about, long_about = None)]
struct Cli {
/// The gameboy rom file
rom: String,
/// Setting uses more battery and set the CPU to 100% but could sometimes solve inconsistent timing.
#[arg(long)]
loop_lock_timing: bool,
#[arg(long)]
fifo_input: Option<String>,
#[arg(long)]
fifo_output: Option<String>,
#[arg(long)]
record_input: Option<String>,
#[arg(long)]
replay_input: Option<String>,
#[arg(short, long, default_value_t = false)]
keyboard: bool,
#[arg(short, long, default_value_t = 1.0)]
speed: f32,
#[arg(short, long, default_value_t = false)]
debug: bool,
}
fn main() {
let cli = Cli::parse();
let mut total_cycle_counter: u128 = 0;
println!("Initializing Gamepad...");
println!("Starting {:?}...", &cli.rom);
let mut state = match (cli.fifo_input, cli.fifo_output) {
(Some(fifo_input), Some(fifo_output)) => {
GBState::new(Box::new(serial::FIFOSerial::new(fifo_input, fifo_output)))
}
(None, None) => GBState::new(Box::new(serial::UnconnectedSerial {})),
_ => panic!("If using fifo serial, both input and output should be set"),
};
let save_file = format!("{}.sav", &cli.rom);
state.mem.load_rom(&cli.rom).unwrap();
if let Err(_) = state.mem.load_external_ram(&save_file) {
println!(
"\"{}\" not found. Initializing new external ram.",
save_file
);
}
let mut window = window::Window::new().unwrap();
let mut gamepad: Box<dyn Input> = if let Some(record_file) = cli.replay_input {
Box::new(GamepadReplay::new(record_file))
} else if cli.keyboard {
Box::new(Keyboard::new(window.keys.clone()))
} else {
Box::new(Gamepad::new())
};
if let Some(record_file) = cli.record_input {
gamepad = Box::new(GamepadRecorder::new(gamepad, record_file));
};
state.is_debug = cli.debug;
let mut nanos_sleep: f64 = 0.0;
let mut halt_time = 0;
let mut was_previously_halted = false;
let mut last_ram_bank_enabled = false;
let mut now = SystemTime::now();
let mut next_precise_gamepad_update: Option<u128> = None;
loop {
if was_previously_halted && !state.mem.halt {
println!("Halt cycles {}", halt_time);
halt_time = 0;
}
was_previously_halted = state.mem.halt;
let c = if !state.mem.halt {
state.exec_opcode().unwrap()
} else {
halt_time += 4;
4
};
state.cpu.dbg_cycle_counter += c;
total_cycle_counter += c as u128;
state.div_timer(c);
state.tima_timer(c);
state.update_display_interrupts(c);
state.check_interrupts().unwrap();
state.mem.update_serial();
nanos_sleep += c as f64 * (consts::CPU_CYCLE_LENGTH_NANOS as f64 / cli.speed as f64) as f64;
if nanos_sleep >= 0.0 || next_precise_gamepad_update.map_or(false, |c| (c >= total_cycle_counter)) {
next_precise_gamepad_update = gamepad.update_events(total_cycle_counter);
let (action_button_reg, direction_button_reg) = (
gamepad.get_action_gamepad_reg(),
gamepad.get_direction_gamepad_reg(),
);
if state.mem.joypad_is_action
&& (action_button_reg & (state.mem.joypad_reg >> 4)) != (state.mem.joypad_reg >> 4)
|| (!state.mem.joypad_is_action
&& (direction_button_reg & state.mem.joypad_reg & 0b1111)
!= (state.mem.joypad_reg & 0b1111))
{
state.mem.io[0x0f] |= 0b10000;
}
state.mem.joypad_reg = direction_button_reg | (action_button_reg << 4);
}
if nanos_sleep > 0.0 {
if let Some(fb) = state.mem.display.redraw_request {
if let Some(window::WindowSignal::Exit) = window.update(&fb) {
break;
}
}
if !cli.loop_lock_timing {
thread::sleep(time::Duration::from_nanos(nanos_sleep as u64 / 10));
} else {
while SystemTime::now().duration_since(now).unwrap().as_nanos()
< nanos_sleep as u128
{
for _ in 0..100_000_000 {}
}
}
nanos_sleep =
nanos_sleep - SystemTime::now().duration_since(now).unwrap().as_nanos() as f64;
now = SystemTime::now();
if last_ram_bank_enabled && !state.mem.ram_bank_enabled {
println!("Saving to \"{}\"...", save_file);
if let Err(_) = state.mem.save_external_ram(&save_file) {
println!("Failed to save external RAM");
}
}
last_ram_bank_enabled = state.mem.ram_bank_enabled;
}
}
}
|
