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use std::time::SystemTime;
use std::{thread, time};
use crate::consts;
use crate::state::GBState;
pub trait Input {
fn update_events(&mut self, cycles: u128) -> Option<u128>;
fn get_action_gamepad_reg(&self) -> u8;
fn get_direction_gamepad_reg(&self) -> u8;
fn save_state(&mut self) -> bool;
}
impl<T: Input + ?Sized> Input for Box<T> {
fn update_events(&mut self, cycles: u128) -> Option<u128> {
(**self).update_events(cycles)
}
fn get_action_gamepad_reg(&self) -> u8 {
(**self).get_action_gamepad_reg()
}
fn get_direction_gamepad_reg(&self) -> u8 {
(**self).get_direction_gamepad_reg()
}
fn save_state(&mut self) -> bool {
(**self).save_state()
}
}
pub enum WindowSignal {
Exit,
}
pub trait Window {
fn update(&mut self, fb: &[u32; 160 * 144]) -> Option<WindowSignal>;
}
pub trait Serial {
// Should not be blocking
fn write(&mut self, byte: u8);
fn read(&mut self) -> u8;
fn new_transfer(&mut self) -> bool; // since last read
fn clock_master(&mut self) -> bool;
fn set_clock_master(&mut self, clock_master: bool);
}
pub trait Audio {
fn new<S: Iterator<Item = f32> + Send + 'static>(wave: S) -> Self;
}
pub trait LoadSave
where
Self::Error: std::fmt::Display,
Self::Error: std::fmt::Debug,
{
type Error;
fn load_bootrom(&self, boot_rom: &mut [u8]) -> Result<(), Self::Error>;
fn load_rom(&self, rom: &mut [u8]) -> Result<(), Self::Error>;
fn load_external_ram(&self, external_ram: &mut [u8]) -> Result<(), Self::Error>;
fn save_external_ram(&self, external_ram: &[u8]) -> Result<(), Self::Error>;
fn dump_state<S: Serial, A: Audio>(&self, state: &GBState<S, A>) -> Result<(), Self::Error>;
fn save_state<S: Serial, A: Audio>(&self, state: &GBState<S, A>) -> Result<(), Self::Error>;
fn load_state<S: Serial, A: Audio>(&self, state: &mut GBState<S, A>)
-> Result<(), Self::Error>;
}
pub struct Gameboy<I: Input, W: Window, S: Serial, A: Audio, LS: LoadSave> {
input: I,
window: W,
speed: f64,
state: GBState<S, A>,
load_save: LS,
}
impl<I: Input, W: Window, S: Serial, A: Audio, LS: LoadSave> Gameboy<I, W, S, A, LS> {
pub fn new(input: I, window: W, serial: S, load_save: LS, speed: f64) -> Self {
Self {
input,
window,
speed,
state: GBState::<S, A>::new(serial),
load_save,
}
}
pub fn load_state(&mut self) -> Result<(), LS::Error> {
self.load_save.load_state(&mut self.state)?;
Ok(())
}
pub fn debug(&mut self) {
self.state.is_debug = true;
}
pub fn start(self) {
let Self {
mut window,
mut input,
speed,
mut state,
load_save,
} = self;
load_save.load_bootrom(state.mem.boot_rom.as_mut()).unwrap();
load_save.load_rom(state.mem.rom.as_mut()).unwrap();
if let Err(err) = load_save.load_external_ram(state.mem.external_ram.as_mut()) {
println!(
"Loading save failed ({}). Initializing new external ram.",
err
);
}
let mut total_cycle_counter: u128 = 0;
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()
} 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();
state.mem.update_serial();
nanos_sleep += c as f64 * (consts::CPU_CYCLE_LENGTH_NANOS as f64 / speed) as f64;
if nanos_sleep >= 0.0
|| next_precise_gamepad_update.map_or(false, |c| (c >= total_cycle_counter))
{
next_precise_gamepad_update = input.update_events(total_cycle_counter);
let (action_button_reg, direction_button_reg, save_state) = (
input.get_action_gamepad_reg(),
input.get_direction_gamepad_reg(),
input.save_state(),
);
if save_state {
if let Err(err) = load_save.save_state(&state) {
eprintln!("FAILED SAVE STATE: {:?}", err);
}
}
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(WindowSignal::Exit) = window.update(&fb) {
break;
}
}
thread::sleep(time::Duration::from_nanos(nanos_sleep as u64 / 10));
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 {
if let Err(err) = load_save.save_external_ram(state.mem.external_ram.as_ref()) {
println!("Failed to save external RAM ({})", err);
}
}
last_ram_bank_enabled = state.mem.ram_bank_enabled;
}
}
}
}
|
