349 lines
11 KiB
Rust
349 lines
11 KiB
Rust
extern crate crossbeam_channel;
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extern crate rustro;
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extern crate sdl2;
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use rustro::retro;
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use rustro::retro::ffi::{GameGeometry, SystemInfo, SystemAvInfo};
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use rustro::retro::constants::{Input, DeviceIndex, JoypadButton, AnalogAxis};
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use std::ffi::CStr;
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use std::io::Read;
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use std::path::{Path, PathBuf};
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use std::pin::Pin;
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use std::time::{Duration, Instant};
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use structopt::StructOpt;
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use sdl2::audio::{AudioCallback, AudioFormat, AudioSpec, AudioSpecDesired, AudioDevice};
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use sdl2::controller::{GameController, Button, Axis};
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use sdl2::event::Event;
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use sdl2::keyboard::Keycode;
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use sdl2::rect::Rect;
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use sdl2::render::{TextureCreator, WindowCanvas};
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use sdl2::video::WindowContext;
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struct MyEmulator {
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retro: retro::wrapper::LibretroWrapper,
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sys_info: SystemInfo,
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av_info: SystemAvInfo,
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sdl_context: sdl2::Sdl,
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// video bits
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canvas: WindowCanvas,
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pixel_format: sdl2::pixels::PixelFormatEnum,
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texture_creator: TextureCreator<WindowContext>,
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// audio bits
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audio_buffer: Vec<i16>,
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audio_spec: AudioSpec,
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audio_device: AudioDevice<MySdlAudio>,
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audio_sender: crossbeam_channel::Sender<Vec<i16>>,
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// input bits
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gamepad_subsys: sdl2::GameControllerSubsystem,
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gamepads: Vec<GameController>,
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}
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impl MyEmulator {
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pub fn with_core(core: impl AsRef<Path>) -> Pin<Box<Self>> {
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let lib = libloading::Library::new(core.as_ref()).unwrap();
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let raw_retro = retro::loading::LibretroApi::from_library(lib).unwrap();
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let retro = retro::wrapper::LibretroWrapper::from(raw_retro);
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let sys_info = retro.as_ref().get_system_info();
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let title = format!(
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"{} - rust libretro",
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unsafe { CStr::from_ptr(sys_info.library_name) }.to_string_lossy()
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);
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let mut av_info = retro.as_ref().get_system_av_info();
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let pixel_format = sdl2::pixels::PixelFormatEnum::ABGR1555;
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// HACK: some cores don't report this 'til we get an environ call to set_system_av_info...
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// which is too late for this constructor to pass along to SDL.
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if av_info.timing.sample_rate == 0.0 {
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av_info.timing.sample_rate = 32040.0;
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}
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// similar hack, this one making sure we don't divide by zero in our frame limiter.
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if av_info.timing.fps == 0.0 {
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av_info.timing.fps = 60.0;
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}
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let sdl_context = sdl2::init().unwrap();
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let (width, height) = (av_info.geometry.base_width, av_info.geometry.base_height);
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let window = sdl_context
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.video()
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.unwrap()
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.window(title.as_str(), width, height)
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.opengl()
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.build()
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.unwrap();
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let canvas = window.into_canvas().build().unwrap();
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let texture_creator = canvas.texture_creator();
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let (audio_sender, audio_receiver) = crossbeam_channel::bounded(2);
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let audio = sdl_context.audio().unwrap();
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let desired_spec = AudioSpecDesired {
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freq: Some(av_info.timing.sample_rate.round() as i32),
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channels: Some(2),
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samples: None,
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};
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let mut audio_spec = None;
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let audio_device = audio
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.open_playback(None, &desired_spec, |spec| {
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if spec.format != AudioFormat::S16LSB {
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println!("unsupported audio format {:?}", spec.format);
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}
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audio_spec = Some(spec.clone());
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MySdlAudio {
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audio_spec: spec,
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audio_receiver,
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}
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})
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.unwrap();
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let gamepad_subsys = sdl_context.game_controller().unwrap();
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let mut gamepads = Vec::new();
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for i in 0..gamepad_subsys.num_joysticks().unwrap() {
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gamepads.extend(gamepad_subsys.open(i).into_iter());
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}
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let emu = MyEmulator {
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retro,
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av_info,
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sys_info,
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sdl_context,
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canvas,
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pixel_format,
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texture_creator,
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audio_buffer: Default::default(),
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audio_spec: audio_spec.unwrap(),
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audio_device,
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audio_sender,
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gamepad_subsys,
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gamepads,
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};
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let mut pin_emu = Box::pin(emu);
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retro::wrapper::set_handler(pin_emu.as_mut());
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pin_emu.retro.as_ref().init();
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pin_emu
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}
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pub fn run(&mut self) {
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self.audio_device.resume();
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let mut event_pump = self.sdl_context.event_pump().unwrap();
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'running: loop {
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let frame_begin = Instant::now();
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for event in event_pump.poll_iter() {
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match event {
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Event::Quit { .. }
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| Event::KeyDown {
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keycode: Some(Keycode::Escape),
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..
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} => break 'running,
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_ => {}
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}
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}
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// The rest of the game loop goes here...
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self.retro.as_ref().run();
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self.canvas.present();
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Duration::from_secs_f64(1.0 / self.av_info.timing.fps)
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.checked_sub(frame_begin.elapsed())
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.map(std::thread::sleep);
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}
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}
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pub fn load_game(&self, rom: impl AsRef<Path>) {
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let path = rom.as_ref();
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let mut data = None;
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let mut v = Vec::new();
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if !self.sys_info.need_fullpath {
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if let Ok(mut f) = std::fs::File::open(path) {
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if f.read_to_end(&mut v).is_ok() {
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data = Some(v.as_ref());
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}
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}
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}
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self.retro
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.as_ref()
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.load_game(Some(path), data, None)
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.unwrap();
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}
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fn send_audio_samples(&mut self) {
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let stereo_samples = self.audio_spec.samples as usize * 2;
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while self.audio_buffer.len() >= stereo_samples {
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let remainder = self.audio_buffer.split_off(stereo_samples);
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let msg = std::mem::replace(&mut self.audio_buffer, remainder);
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let _ = self.audio_sender.try_send(msg);
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}
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}
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}
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impl Drop for MyEmulator {
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fn drop(&mut self) {
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retro::wrapper::unset_handler();
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}
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}
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impl retro::wrapper::Handler for MyEmulator {
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fn video_refresh(&mut self, data: &[u8], width: u32, height: u32, pitch: u32) {
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let rect = Rect::new(0, 0, width, height);
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if let Ok(mut tex) =
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self.texture_creator
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.create_texture_static(self.pixel_format, width, height)
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{
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if tex.update(rect, data, pitch as usize).is_ok() {
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self.canvas.clear();
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self.canvas.copy(&tex, None, None).unwrap();
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}
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}
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}
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fn audio_sample(&mut self, left: i16, right: i16) {
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self.audio_buffer.push(left);
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self.audio_buffer.push(right);
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self.send_audio_samples()
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}
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fn audio_sample_batch(&mut self, stereo_pcm: &[i16]) -> usize {
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self.audio_buffer.extend(stereo_pcm);
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self.send_audio_samples();
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stereo_pcm.len()
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}
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fn input_poll(&mut self) {
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self.gamepad_subsys.update();
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}
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fn input_state(&mut self, port: u32, device: Input, index: DeviceIndex) -> i16 {
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match self.gamepads.get(port as usize) {
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Some(gamepad) => {
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match device {
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Input::Joypad(button) => {
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match button_map(&button) {
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Some(x) => gamepad.button(x) as i16,
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None => match button {
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JoypadButton::L2 => gamepad.axis(Axis::TriggerLeft),
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JoypadButton::R2 => gamepad.axis(Axis::TriggerRight),
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_ => 0,
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}
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}
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}
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Input::Analog(axis) => gamepad.axis(axis_map(index, axis)),
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_ => 0,
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}
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}
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None => 0,
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}
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}
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fn get_can_dupe(&mut self) -> Option<bool> { Some(true) }
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fn set_pixel_format(&mut self, pix_fmt: retro::ffi::PixelFormat) -> bool {
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self.pixel_format = match pix_fmt {
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retro::ffi::PixelFormat::ARGB1555 => sdl2::pixels::PixelFormatEnum::RGB555,
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retro::ffi::PixelFormat::ARGB8888 => sdl2::pixels::PixelFormatEnum::ARGB8888,
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retro::ffi::PixelFormat::RGB565 => sdl2::pixels::PixelFormatEnum::RGB565,
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};
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true
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}
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fn set_system_av_info(&mut self, av_info: SystemAvInfo) -> bool {
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let (width, height) = (av_info.geometry.base_width, av_info.geometry.base_height);
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let _ = self.canvas.window_mut().set_size(width, height);
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let _ = self.canvas.set_logical_size(width, height);
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self.av_info = av_info;
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true
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}
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fn set_geometry(&mut self, geom: GameGeometry) -> bool {
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let (width, height) = (geom.base_width, geom.base_height);
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let _ = self.canvas.window_mut().set_size(width, height);
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let _ = self.canvas.set_logical_size(width, height);
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self.av_info.geometry = geom;
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true
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}
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fn log_print(&mut self, level: retro::ffi::LogLevel, msg: &str) {
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eprint!("[{:?}] {}", level, msg);
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}
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}
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struct MySdlAudio {
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audio_spec: AudioSpec,
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audio_receiver: crossbeam_channel::Receiver<Vec<i16>>,
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}
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impl AudioCallback for MySdlAudio {
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type Channel = i16;
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fn callback(&mut self, out: &mut [Self::Channel]) {
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if self.audio_spec.format == AudioFormat::S16LSB {
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if let Ok(samples) = self.audio_receiver.recv() {
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out.copy_from_slice(&samples[..out.len()]);
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}
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}
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}
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}
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pub fn main() -> failure::Fallible<()> {
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let opt: Opt = Opt::from_args();
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let mut emu = MyEmulator::with_core(&opt.core);
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emu.load_game(&opt.rom);
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emu.run();
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Ok(())
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}
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#[derive(StructOpt)]
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struct Opt {
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/// Core module to use.
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#[structopt(short, long, parse(from_os_str))]
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core: PathBuf,
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/// Rom to load using the core.
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#[structopt(short, long, parse(from_os_str))]
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rom: PathBuf,
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}
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fn button_map(retro_button: &JoypadButton) -> Option<Button> {
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match retro_button {
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JoypadButton::B => Some(Button::A),
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JoypadButton::Y => Some(Button::X),
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JoypadButton::Select => Some(Button::Back),
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JoypadButton::Start => Some(Button::Start),
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JoypadButton::Up => Some(Button::DPadUp),
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JoypadButton::Down => Some(Button::DPadDown),
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JoypadButton::Left => Some(Button::DPadLeft),
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JoypadButton::Right => Some(Button::DPadRight),
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JoypadButton::A => Some(Button::B),
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JoypadButton::X => Some(Button::Y),
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JoypadButton::L => Some(Button::LeftShoulder),
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JoypadButton::R => Some(Button::RightShoulder),
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// SDL2 controller API doesn't have L2/R2 as buttons, they're considered axes
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JoypadButton::L2 => None,
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JoypadButton::R2 => None,
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JoypadButton::L3 => Some(Button::LeftStick),
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JoypadButton::R3 => Some(Button::RightStick),
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}
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}
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fn axis_map(index: DeviceIndex, axis: AnalogAxis) -> Axis {
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match (index, axis) {
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(DeviceIndex::Left, AnalogAxis::X) => Axis::LeftX,
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(DeviceIndex::Left, AnalogAxis::Y) => Axis::LeftY,
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(DeviceIndex::Right, AnalogAxis::X) => Axis::RightX,
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(DeviceIndex::Right, AnalogAxis::Y) => Axis::RightY,
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}
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}
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