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emulator core struct

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This commit is contained in:
Alex Janka 2023-03-06 19:20:47 +11:00
parent 4a2c15e5ec
commit 0459390d78
5 changed files with 149 additions and 108 deletions
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13
gb-emu/src/main.rs
View file

@ -11,6 +11,7 @@ use futures::executor;
use gb_emu_lib::{
connect::{AudioOutput, EmulatorMessage, JoypadState, Renderer, RomFile},
util::scale_buffer,
EmulatorCore,
};
use gilrs::{
ff::{BaseEffect, BaseEffectType, EffectBuilder, Replay, Ticks},
@ -81,7 +82,6 @@ fn main() {
bootrom_path: args.bootrom,
connect_serial: args.connect_serial,
verbose: args.verbose,
step_by: args.step_by,
cycle_count: args.cycle_count,
};
@ -97,13 +97,22 @@ fn main() {
let (output, _stream) = create_audio_output();
gb_emu_lib::init(
let mut core = EmulatorCore::init(
receiver,
options,
Box::new(WindowRenderer::new(factor, Some(Gilrs::new().unwrap()))),
output,
tile_window,
);
match args.step_by {
Some(step_size) => loop {
core.run_stepped(step_size);
},
None => loop {
core.run();
},
}
}
fn create_audio_output() -> (AudioOutput, Stream) {

120
lib/src/lib.rs
View file

@ -6,10 +6,7 @@
bigint_helper_methods
)]
use crate::{
processor::memory::Memory,
util::{pause, print_cycles},
};
use crate::{processor::memory::Memory, util::pause};
use connect::{AudioOutput, EmulatorMessage, Renderer, RomFile};
use once_cell::sync::OnceCell;
use processor::{memory::Rom, Cpu};
@ -35,7 +32,6 @@ pub struct Options {
pub bootrom_path: Option<String>,
pub connect_serial: bool,
pub verbose: bool,
pub step_by: Option<usize>,
pub cycle_count: bool,
}
@ -47,13 +43,21 @@ static VERBOSE: OnceCell<bool> = OnceCell::new();
pub const WIDTH: usize = 160;
pub const HEIGHT: usize = 144;
pub fn init(
pub struct EmulatorCore {
receiver: Receiver<EmulatorMessage>,
cpu: Cpu,
cycle_num: usize,
cycle_count: bool,
}
impl EmulatorCore {
pub fn init(
receiver: Receiver<EmulatorMessage>,
options: Options,
mut window: Box<dyn Renderer>,
output: AudioOutput,
tile_window: Option<Box<dyn Renderer>>,
) {
) -> Self {
VERBOSE.set(options.verbose).unwrap();
let rom = match options.rom {
@ -72,7 +76,7 @@ pub fn init(
Ok(data) => Rom::load(data, maybe_save),
Err(e) => {
println!("Error reading ROM: {e}");
return;
exit(1);
}
}
}
@ -88,14 +92,16 @@ pub fn init(
Ok(data) => Some(data),
Err(e) => {
println!("Error reading bootROM: {e}");
return;
exit(1);
}
}
} else {
None
};
let mut cpu = Cpu::new(
Self::new(
receiver,
Cpu::new(
Memory::init(
bootrom,
rom,
@ -105,55 +111,89 @@ pub fn init(
tile_window,
),
bootrom_enabled,
);
),
options.cycle_count,
)
}
let mut cycle_num = 0;
fn new(receiver: Receiver<EmulatorMessage>, cpu: Cpu, cycle_count: bool) -> Self {
Self {
receiver,
cpu,
cycle_num: 0,
cycle_count,
}
}
verbose_println!("\n\n Begin execution...\n");
match options.step_by {
Some(step_size) => loop {
process_messages(&receiver, &mut cpu);
pub fn run(&mut self) {
self.process_messages();
self.cycle_num += 1;
if self.cycle_count {
self.print_cycles();
}
self.run_cycle();
}
pub fn run_stepped(&mut self, step_size: usize) {
loop {
self.process_messages();
for _ in 0..step_size {
cycle_num += 1;
if options.cycle_count {
print_cycles(&cycle_num);
self.cycle_num += 1;
if self.cycle_count {
self.print_cycles();
}
run_cycle(&mut cpu);
self.run_cycle();
}
print!(" ...{cycle_num} cycles - press enter to continue\r");
print!(
" ...{} cycles - press enter to continue\r",
self.cycle_num
);
stdout().flush().unwrap();
pause();
},
None => loop {
process_messages(&receiver, &mut cpu);
cycle_num += 1;
if options.cycle_count {
print_cycles(&cycle_num);
}
run_cycle(&mut cpu);
},
}
}
fn process_messages(receiver: &Receiver<EmulatorMessage>, cpu: &mut Cpu) {
while let Ok(msg) = receiver.try_recv() {
match msg {
EmulatorMessage::Stop => {
cpu.memory.flush_rom();
exit(0);
pub fn run_until_buffer_full(&mut self) {
while !self.cpu.memory.is_audio_buffer_full() {
loop {
self.run();
}
}
}
}
fn run_cycle(cpu: &mut Cpu) {
fn run_cycle(&mut self) {
let will_pause = unsafe { PAUSE_QUEUED };
let pause_enabled = unsafe { PAUSE_ENABLED };
cpu.exec_next();
if !pause_enabled && cpu.reg.pc >= 0x100 {
self.cpu.exec_next();
if !pause_enabled && self.cpu.reg.pc >= 0x100 {
unsafe { PAUSE_ENABLED = true };
}
if will_pause {
pause_then_step();
}
}
fn process_messages(&mut self) {
while let Ok(msg) = self.receiver.try_recv() {
match msg {
EmulatorMessage::Stop => {
self.cpu.memory.flush_rom();
exit(0);
}
}
}
}
fn print_cycles(&self) {
if self.cycle_num % 45678 != 0 {
return;
}
let instructions_per_second = 400000;
print!(
"cycle {} - approx {} seconds on real hardware\r",
self.cycle_num,
self.cycle_num / instructions_per_second
);
stdout().flush().unwrap();
}
}

4
lib/src/processor/memory.rs
View file

@ -222,6 +222,10 @@ impl Memory {
pub fn flush_rom(&mut self) {
self.rom.flush();
}
pub fn is_audio_buffer_full(&self) -> bool {
self.apu.is_buffer_full()
}
}
impl Cpu {

4
lib/src/processor/memory/mmio/apu.rs
View file

@ -124,6 +124,10 @@ impl Apu {
executor::block_on(self.output.send_rb.push_slice(&converted)).unwrap();
}
pub fn is_buffer_full(&self) -> bool {
self.output.send_rb.is_full()
}
pub fn get_register(&self, addr: Address) -> u8 {
if self.apu_enable {
self.make_register(addr)

18
lib/src/util.rs
View file

@ -1,8 +1,5 @@
use crate::{processor::Direction, PAUSE_ENABLED, PAUSE_QUEUED, VERBOSE};
use std::{
io::{self, stdout, Write},
mem::transmute,
};
use std::{io, mem::transmute};
#[macro_export]
macro_rules! verbose_println {
@ -45,19 +42,6 @@ pub(crate) fn pause() -> String {
}
}
pub(crate) fn print_cycles(cycles: &i32) {
if *cycles % 45678 != 0 {
return;
}
let instructions_per_second = 400000;
print!(
"cycle {} - approx {} seconds on real hardware\r",
cycles,
cycles / instructions_per_second
);
stdout().flush().unwrap();
}
pub(crate) fn is_verbose() -> bool {
match VERBOSE.get() {
Some(v) => *v,