docs: add README and LICENSE

This commit is contained in:
EliseZeroTwo 2024-01-02 17:47:14 -07:00
parent 70f64f73c3
commit 3fca7dbb71
Signed by: elise
GPG key ID: FA8F56FFFE6E8B3E
8 changed files with 741 additions and 313 deletions

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72
README.md Normal file
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@ -0,0 +1,72 @@
# MeowGB
A Gameboy (DMG) emulator written in Rust, aiming for cycle accuracy and conformance with weird hardware quirks.
To view what test ROMs are currently passed and part of CI, look at [tests.md](./tests.md), test ROMs are stored in subfolders inside [test-roms/](./test-roms/) and each subfolder contains the original license of the test-roms.
## Contents
* [Features](#features)
* [Future Features](#future-features)
* [Structure](#structure)
* [Usage](#usage)
* [Key Bindings](#key-bindings)
* [Configuration](#configuration)
* [License Info](#license)
## Features
* Mostly M-cycle accurate instructions (passes tests)
* Memory bus emulation
* Pipelined CPU (passes timing tests)
* Partially working PPU (ticked at the correct speed, drawing pixel by pixel)
## Future Features
* Audio
* Visual debugger/state inspector
* T-cycle accurate PPU
* Networked link-cable
## Structure
There are currently 4 crates used in this project:
* `meowgb`: A cross-platform frontend for the emulator
* `meowgb-core`: The implementation of the emulator
* `meowgb-opcode`: Procedural macro used in `meowgb-core` for defining opcodes
* `meowgb-tests`: A frontend-less test-harness for running tests and comparing their output, used in CI for ensuring regressions are minimal and noticed as soon as possible
## Usage
You will have to build it yourself as currently there are no premade builds available, once it is in a state I am happy with I will add release builds to CI.
1. Ensure you have a Rust toolchain installed ([docs](https://www.rust-lang.org/tools/install))
2. Run `cargo install --git https://github.com/EliseZeroTwo/MeowGB.git`
3. To launch the emulator, run `meowgb --rom PATH_TO_ROM.GB`
## Key Bindings
By default the keybindings are:
| Gameboy | Keyboard |
|----------|---------------|
| `A` | `A` |
| `B` | `S` |
| `Start` | `W` |
| `Select` | `Q` |
| `Up` | `Arrow Up` |
| `Down` | `Arrow Down` |
| `Left` | `Arrow Left` |
| `Right` | `Arrow Right` |
## Configuration
Default keybindings are overridable by placing a `config.toml` either in the directory you are running the emulator from, or at `~/.meowgb/config.toml`.
An example configuration file can be found in [config.example.toml](./config.example.toml).
## License
This software is currently licensed under the [CNPLv7+](./LICENSE.md), a summary of which can be found at [here](https://thufie.lain.haus/NPL.html).
The contents of the `test-roms` folder is excluded from this, and the original license of the test ROMs are placed in their respective subdirectory, they are not compiled into any of the software, they are included in the repository purely for intergration testing in CI.

View file

@ -8,7 +8,6 @@ edition = "2021"
[dependencies]
meowgb-core = { path = "../meowgb-core" }
clap = { version = "4.4.12", features = ["derive"] }
config = "0.13.4"
env_logger = "0.10.1"
pixels = "0.13.0"
serde = { version = "1.0.130", features = ["derive"] }
@ -17,3 +16,5 @@ winit = { version = "0.29.7", default-features = false, features = ["serde", "rw
winit_input_helper = "0.15.1"
log = "0.4.20"
time = "0.3.31"
home = "0.5.9"
toml = "0.8.8"

120
meowgb/src/config.rs Normal file
View file

@ -0,0 +1,120 @@
use std::path::Path;
use toml::Value;
use winit::keyboard::KeyCode;
#[derive(Debug, thiserror::Error)]
pub enum ConfigError {
#[error("Config source not found")]
SourceNotFound,
#[error("Error reading source file: {0}")]
SourceReadError(std::io::Error),
#[error("TOML parse error: {0}")]
Toml(toml::de::Error),
}
type Result<T> = std::result::Result<T, ConfigError>;
struct ConfigParser(toml::Table);
impl ConfigParser {
pub fn new(default: Option<toml::Table>) -> Self {
Self(default.unwrap_or_default())
}
fn parse_toml(path: &Path) -> Result<toml::Table> {
let file_exists = std::fs::metadata(path).as_ref().map(std::fs::Metadata::is_file).unwrap_or_default();
if !file_exists {
return Err(ConfigError::SourceNotFound);
}
let source_string = std::fs::read_to_string(path).map_err(ConfigError::SourceReadError)?;
toml::from_str(source_string.as_str()).map_err(ConfigError::Toml)
}
/// Merges two values, if both of the values aren't [Value::Table], `new` is returned.
/// Otherwise contents of `new` are placed ontop of contents of `original`, recursively
fn merge_toml(original: Value, new: Value) -> Value {
match (original, new) {
(Value::Table(mut original), Value::Table(new)) => {
for (k, v) in new {
let value = match original.remove(&k) {
Some(original_subvalue) => Self::merge_toml(original_subvalue, v),
None => v,
};
original.insert(k, value);
}
Value::Table(original)
},
(_, new) => new
}
}
/// If file at `path` exists, it merges with the existing config overriding any duplicate keys
pub fn merge_exists(mut self, path: &Path) -> Result<Self> {
let toml = match Self::parse_toml(path) {
Ok(toml) => toml,
Err(ConfigError::SourceNotFound) => return Ok(self),
Err(why) => return Err(why)
};
self.0 = match Self::merge_toml(Value::Table(self.0), Value::Table(toml)) {
Value::Table(table) => table,
_ => unreachable!(),
};
Ok(self)
}
pub fn build<T: serde::de::DeserializeOwned>(self) -> Result<T> {
toml::from_str(dbg!(self.0.to_string()).as_str()).map_err(ConfigError::Toml)
}
}
#[derive(Debug, serde::Deserialize, Clone, Copy)]
pub struct MeowGBConfig {
pub bindings: Bindings,
}
impl MeowGBConfig {
pub fn from_file() -> Result<Self> {
let mut builder = ConfigParser::new(Some(toml::toml! {
[bindings]
a = "KeyA"
b = "KeyS"
select = "KeyQ"
start = "KeyW"
up = "ArrowUp"
down = "ArrowDown"
left = "ArrowLeft"
right = "ArrowRight"
pause = "KeyP"
exit = "Escape"
log_ops = "KeyL"
dump_memory = "Comma"
}));
if let Some(path) = home::home_dir().and_then(|mut path| { path.push(".MeowGB/config.toml"); path.to_str().map(String::from) }) {
builder = builder.merge_exists(path.as_ref())?;
}
builder.merge_exists(Path::new("config.toml"))?.build()
}
}
#[derive(Debug, serde::Deserialize, Clone, Copy)]
pub struct Bindings {
pub a: KeyCode,
pub b: KeyCode,
pub select: KeyCode,
pub start: KeyCode,
pub up: KeyCode,
pub down: KeyCode,
pub left: KeyCode,
pub right: KeyCode,
pub pause: KeyCode,
pub exit: KeyCode,
}

View file

@ -1,4 +1,4 @@
mod settings;
mod config;
mod window;
use std::{
@ -12,7 +12,7 @@ use meowgb_core::gameboy::{
bootrom::{verify_parse_bootrom, BootromParseError},
Gameboy,
};
use settings::DeemgeeConfig;
use config::MeowGBConfig;
use window::EmulatorWindowEvent;
use crate::window::GameboyEvent;
@ -32,20 +32,22 @@ pub struct CliArgs {
}
#[derive(Debug, thiserror::Error)]
pub enum DmgError {
pub enum MeowGBError {
#[error(transparent)]
Bootrom(BootromParseError),
#[error("Game Not Found")]
GameNotFound,
#[error("IO Error: {0}")]
IO(#[from] std::io::Error),
#[error(transparent)]
Config(#[from] config::ConfigError),
}
fn main() {
fn real_main() -> Result<(), MeowGBError> {
env_logger::init();
let args: CliArgs = CliArgs::parse();
let config = DeemgeeConfig::from_file();
let config = MeowGBConfig::from_file()?;
let (window_side_tx, gb_side_rx) = channel::<EmulatorWindowEvent>();
let (gb_side_tx, window_side_rx) = channel::<GameboyEvent>();
@ -56,7 +58,7 @@ fn main() {
let jh = std::thread::Builder::new()
.name(String::from("mewmulator"))
.spawn(move || run_gameboy(config, args, gb_side_rx, gb_side_tx).unwrap())
.spawn(move || run_gameboy(args, gb_side_rx, gb_side_tx).unwrap())
.unwrap();
window::run_window(
@ -67,16 +69,24 @@ fn main() {
);
jh.join().unwrap();
Ok(())
}
fn main() {
if let Err(why) = real_main() {
eprintln!("{}", why);
std::process::exit(1);
}
}
pub fn run_gameboy(
_config: DeemgeeConfig,
args: CliArgs,
rx: Receiver<EmulatorWindowEvent>,
tx: Sender<GameboyEvent>,
) -> Result<(), DmgError> {
) -> Result<(), MeowGBError> {
let bootrom = match args.bootrom.as_deref() {
Some(path) => Some(verify_parse_bootrom(path).map_err(DmgError::Bootrom)?),
Some(path) => Some(verify_parse_bootrom(path).map_err(MeowGBError::Bootrom)?),
None => None,
};
@ -89,7 +99,7 @@ pub fn run_gameboy(
if let Some(rom) = args.rom {
if !rom.is_file() {
return Err(DmgError::GameNotFound);
return Err(MeowGBError::GameNotFound);
}
let rom = std::fs::read(rom.as_path())?;
@ -124,16 +134,7 @@ pub fn run_gameboy(
window::EmulatorWindowEvent::PauseToggle => {
gameboy.single_step = !gameboy.single_step
}
window::EmulatorWindowEvent::LogToggle => {
gameboy.log_instructions = !gameboy.log_instructions
}
window::EmulatorWindowEvent::Exit => break 'outer,
window::EmulatorWindowEvent::DumpMemory => {
let timestamp = time::OffsetDateTime::now_utc().unix_timestamp();
let contents = gameboy.dump_memory();
std::fs::write(format!("./memdump-{}.bin", timestamp), contents)
.expect("Failed to write memory dump");
}
}
}

View file

@ -1,33 +0,0 @@
use winit::keyboard::KeyCode;
#[derive(Debug, serde::Deserialize, Clone, Copy)]
pub struct DeemgeeConfig {
pub bindings: Bindings,
}
impl DeemgeeConfig {
pub fn from_file() -> Self {
config::Config::builder()
.add_source(config::File::with_name("config"))
.build()
.and_then(config::Config::try_deserialize)
.expect("config")
}
}
#[derive(Debug, serde::Deserialize, Clone, Copy)]
pub struct Bindings {
pub a: KeyCode,
pub b: KeyCode,
pub select: KeyCode,
pub start: KeyCode,
pub up: KeyCode,
pub down: KeyCode,
pub left: KeyCode,
pub right: KeyCode,
pub pause: KeyCode,
pub exit: KeyCode,
pub log_ops: KeyCode,
pub dump_memory: KeyCode,
}

View file

@ -9,7 +9,7 @@ use winit::{
};
use winit_input_helper::WinitInputHelper;
use crate::settings::DeemgeeConfig;
use crate::config::MeowGBConfig;
macro_rules! define_keypress {
($input:ident, $config:ident, $keymap:ident, $tx:ident, $key:ident, $event:ident) => {
@ -40,9 +40,7 @@ pub enum EmulatorWindowEvent {
LeftToggle,
RightToggle,
PauseToggle,
LogToggle,
Exit,
DumpMemory,
}
#[derive(Debug)]
@ -64,7 +62,7 @@ struct Keymap {
}
impl Keymap {
pub fn idx(&mut self, config: &DeemgeeConfig, kc: KeyCode) -> &mut bool {
pub fn idx(&mut self, config: &MeowGBConfig, kc: KeyCode) -> &mut bool {
if kc == config.bindings.a {
&mut self.a
} else if kc == config.bindings.b {
@ -91,7 +89,7 @@ impl Keymap {
pub fn run_window(
rom_name: &str,
config: DeemgeeConfig,
config: MeowGBConfig,
rx: Receiver<GameboyEvent>,
tx: Sender<EmulatorWindowEvent>,
) {
@ -174,14 +172,6 @@ pub fn run_window(
tx.send(EmulatorWindowEvent::PauseToggle).unwrap();
}
if input.key_pressed(config.bindings.log_ops) {
tx.send(EmulatorWindowEvent::LogToggle).unwrap();
}
if input.key_pressed(config.bindings.dump_memory) {
tx.send(EmulatorWindowEvent::DumpMemory).unwrap();
}
define_keypress!(input, config, keymap, tx, a, AToggle);
define_keypress!(input, config, keymap, tx, b, BToggle);
define_keypress!(input, config, keymap, tx, start, StartToggle);