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https://github.com/alacritty/alacritty.git
synced 2024-11-03 04:34:21 -05:00
Separate input handling from rendering
To minimize rendering, the input must be handled in a separate thread. To see, why, consider the optimal rendering solution: renders are only necessary when the pty has data that changes the terminal state, OR there is a window event which changes the graphics state. When not drawing, the render thread is to remain parked at a condition variable, and it's not possible to handle input while parked! Thus, we need a separate thread. In addition to adding the separate thread, each subsystem thread is now spawned in a separate function to (hopefully) improve readability.
This commit is contained in:
Joe Wilm
parent
3c5d46c851
commit
fd755831f2
3 changed files with 147 additions and 112 deletions
13
Cargo.lock
generated
13
Cargo.lock
generated
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@ -10,7 +10,7 @@ dependencies = [
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"glutin 0.6.1 (git+https://github.com/jwilm/glutin?rev=22cc23997389bedd948a3ddc3833279ed308a673)",
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"libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"notify 2.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"parking_lot 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"parking_lot 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"serde 0.7.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"serde_macros 0.7.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"serde_yaml 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -562,11 +562,20 @@ dependencies = [
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[[package]]
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name = "parking_lot"
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version = "0.2.6"
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version = "0.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"parking_lot_core 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "parking_lot_core"
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version = "0.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"smallvec 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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@ -13,7 +13,7 @@ notify = "2.6"
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bitflags = "*"
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font = { path = "./font" }
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errno = "0.1.6"
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parking_lot = "0.2.6"
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parking_lot = "0.3.1"
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serde = "0.7"
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serde_yaml = "0.2"
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serde_macros = "0.7"
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@ -23,4 +23,4 @@ gl_generator = "0.5"
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[dependencies.glutin]
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git = "https://github.com/jwilm/glutin"
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rev = "22cc23997389bedd948a3ddc3833279ed308a673"
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rev = "45092a8e2f6706a7b2c613ff212341754e346c9c"
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242
src/main.rs
242
src/main.rs
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@ -51,7 +51,6 @@ mod util;
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mod io;
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mod sync;
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use std::io::{Write, BufWriter, Read};
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use std::sync::{mpsc, Arc};
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use sync::PriorityMutex;
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@ -131,7 +130,7 @@ fn main() {
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let mut renderer = QuadRenderer::new(width, height);
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// Initialize glyph cache
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let mut glyph_cache = {
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let glyph_cache = {
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println!("Initializing glyph cache");
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let init_start = ::std::time::Instant::now();
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@ -154,9 +153,8 @@ fn main() {
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let terminal = Term::new(width as f32, height as f32, cell_width as f32, cell_height as f32);
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let mut reader = terminal.tty().reader();
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let writer = terminal.tty().writer();
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let reader = terminal.tty().reader();
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let mut writer = terminal.tty().writer();
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let (tx, rx) = mpsc::channel();
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unsafe {
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@ -164,24 +162,83 @@ fn main() {
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}
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let terminal = Arc::new(PriorityMutex::new(terminal));
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let term_ref = terminal.clone();
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let term_updater = terminal.clone();
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// Rendering thread
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//
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// Holds lock only when updating terminal
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let reader_thread = thread::spawn_named("TTY Reader", move || {
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let pty_reader_thread = spawn_pty_reader(terminal.clone(), reader);
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let window = Arc::new(window);
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let _ = window.clear_current();
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let render_thread = spawn_renderer(window.clone(),
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terminal.clone(),
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renderer,
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glyph_cache,
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render_timer,
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rx);
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handle_window_events(&mut writer, terminal, window);
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pty_reader_thread.join().ok();
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render_thread.join().ok();
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println!("Goodbye");
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}
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/// Handle window events until the application should close
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fn handle_window_events<W>(writer: &mut W,
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terminal: Arc<PriorityMutex<Term>>,
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window: Arc<glutin::Window>)
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where W: std::io::Write,
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{
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let mut input_processor = input::Processor::new();
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let resize_tx = unsafe { resize_sender.as_ref().cloned().unwrap() };
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for event in window.wait_events() {
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match event {
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glutin::Event::Closed => break,
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glutin::Event::ReceivedCharacter(c) => {
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match c {
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// Ignore BACKSPACE and DEL. These are handled specially.
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'\u{8}' | '\u{7f}' => (),
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// OSX arrow keys send invalid characters; ignore.
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'\u{f700}' | '\u{f701}' | '\u{f702}' | '\u{f703}' => (),
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_ => {
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let encoded = c.encode_utf8();
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writer.write(encoded.as_slice()).unwrap();
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}
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}
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},
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glutin::Event::Resized(w, h) => {
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resize_tx.send((w, h)).expect("send new size");
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},
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glutin::Event::KeyboardInput(state, _code, key, mods) => {
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// Acquire term lock
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let terminal = terminal.lock_high();
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input_processor.process(state,
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key,
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mods,
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&mut input::WriteNotifier(writer),
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*terminal.mode())
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},
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_ => (),
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}
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}
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}
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fn spawn_pty_reader<R>(terminal: Arc<PriorityMutex<Term>>, mut pty: R) -> std::thread::JoinHandle<()>
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where R: std::io::Read + Send + 'static,
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{
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thread::spawn_named("pty reader", move || {
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let mut buf = [0u8; 4096];
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let mut start = 0;
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let mut pty_parser = ansi::Parser::new();
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'reader: loop {
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let got = reader.read(&mut buf[start..]).expect("pty fd active");
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loop {
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let got = pty.read(&mut buf[start..]).expect("pty fd active");
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let mut remain = 0;
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// if `start` is nonzero, then actual bytes in buffer is > `got` by `start` bytes.
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let end = start + got;
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let mut terminal = term_updater.lock_low();
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let mut terminal = terminal.lock_low();
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for c in Utf8Chars::new(&buf[..end]) {
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match c {
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Ok(c) => pty_parser.advance(&mut *terminal, c),
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@ -201,108 +258,77 @@ fn main() {
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}
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start = remain;
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}
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});
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})
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}
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let mut meter = Meter::new();
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fn spawn_renderer(window: Arc<glutin::Window>,
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terminal: Arc<PriorityMutex<Term>>,
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mut renderer: QuadRenderer,
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mut glyph_cache: GlyphCache,
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render_timer: bool,
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rx: mpsc::Receiver<(u32, u32)>) -> std::thread::JoinHandle<()> {
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thread::spawn_named("render", move || {
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unsafe {
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let _ = window.make_current();
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}
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let mut meter = Meter::new();
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let window = Arc::new(window);
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let window_ref = window.clone();
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let mut input_processor = input::Processor::new();
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'main_loop: loop {
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// Scope ensures terminal lock isn't held when calling swap_buffers
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{
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// Acquire term lock
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let mut terminal = term_ref.lock_high();
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// Resize events new_size and are handled outside the poll_events
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// iterator. This has the effect of coalescing multiple resize
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// events into one.
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let mut new_size = None;
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// Process input events
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'render_loop: loop {
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// Scope ensures terminal lock isn't held when calling swap_buffers
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{
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let mut writer = BufWriter::new(&writer);
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for event in window_ref.poll_events() {
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match event {
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glutin::Event::Closed => break 'main_loop,
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glutin::Event::ReceivedCharacter(c) => {
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match c {
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// Ignore BACKSPACE and DEL. These are handled specially.
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'\u{8}' | '\u{7f}' => (),
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// OSX arrow keys send invalid characters; ignore.
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'\u{f700}' | '\u{f701}' | '\u{f702}' | '\u{f703}' => (),
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_ => {
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let encoded = c.encode_utf8();
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writer.write(encoded.as_slice()).unwrap();
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}
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}
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},
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glutin::Event::Resized(w, h) => {
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new_size = Some((w, h));
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},
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glutin::Event::KeyboardInput(state, _code, key, mods) => {
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input_processor.process(state,
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key,
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mods,
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&mut input::WriteNotifier(&mut writer),
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*terminal.mode())
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},
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_ => (),
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// Acquire term lock
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let mut terminal = terminal.lock_high();
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// Resize events new_size and are handled outside the poll_events
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// iterator. This has the effect of coalescing multiple resize
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// events into one.
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let mut new_size = None;
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unsafe {
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gl::ClearColor(0.0, 0.0, 0.00, 1.0);
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gl::Clear(gl::COLOR_BUFFER_BIT);
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}
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// Check for any out-of-band resize events (mac only)
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while let Ok(sz) = rx.try_recv() {
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new_size = Some(sz);
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}
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// Receive any resize events; only call gl::Viewport on last
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// available
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if let Some((w, h)) = new_size.take() {
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terminal.resize(w as f32, h as f32);
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renderer.resize(w as i32, h as i32);
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}
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{
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// Draw grid
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{
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let _sampler = meter.sampler();
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let size_info = terminal.size_info().clone();
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renderer.with_api(&size_info, |mut api| {
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// Draw the grid
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api.render_grid(&terminal.render_grid(), &mut glyph_cache);
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});
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}
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// Draw render timer
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if render_timer {
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let timing = format!("{:.3} usec", meter.average());
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let color = Rgb { r: 0xd5, g: 0x4e, b: 0x53 };
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renderer.with_api(terminal.size_info(), |mut api| {
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api.render_string(&timing[..], &mut glyph_cache, &color);
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});
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}
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}
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}
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unsafe {
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gl::ClearColor(0.0, 0.0, 0.00, 1.0);
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gl::Clear(gl::COLOR_BUFFER_BIT);
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}
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window.swap_buffers().unwrap();
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// Check for any out-of-band resize events (mac only)
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while let Ok(sz) = rx.try_recv() {
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new_size = Some(sz);
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}
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// Receive any resize events; only call gl::Viewport on last
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// available
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if let Some((w, h)) = new_size.take() {
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terminal.resize(w as f32, h as f32);
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renderer.resize(w as i32, h as i32);
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}
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{
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// Draw grid
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{
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let _sampler = meter.sampler();
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let size_info = terminal.size_info().clone();
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renderer.with_api(&size_info, |mut api| {
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// Draw the grid
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api.render_grid(&terminal.render_grid(), &mut glyph_cache);
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});
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}
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// Draw render timer
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if render_timer {
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let timing = format!("{:.3} usec", meter.average());
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let color = Rgb { r: 0xd5, g: 0x4e, b: 0x53 };
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renderer.with_api(terminal.size_info(), |mut api| {
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api.render_string(&timing[..], &mut glyph_cache, &color);
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});
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}
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if process_should_exit() {
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break;
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}
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}
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window.swap_buffers().unwrap();
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if process_should_exit() {
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break;
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}
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}
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reader_thread.join().ok();
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println!("Goodbye");
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})
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}
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