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Silas Bartha 2024-04-26 01:27:13 -04:00
commit 646db83286
Signed by: soaos
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/target

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[package]
name = "grex_terminal_display"
version = "0.1.0"
edition = "2021"
[dependencies]
crossterm = "0.27.0"
[dependencies.bevy]
version = "0.13"
features = ["dynamic_linking"]
[dependencies.grex_framebuffer_extract]
git = "https://github.com/exvacuum/grex_framebuffer_extract"
tag = "v0.1.0"
[dependencies.grex_dither_post_process]
git = "https://github.com/exvacuum/grex_dither_post_process"
tag = "v0.1.2"

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# grex_terminal_display
A (very experimental) plugin for the [Bevy](https://bevyengine.org) engine which allows for rendering to a terminal window.
WARNING: I highly recommend using the kitty terminal emulator with this, not only due to the gpu-accelerated rendering, but also the implementation of the kitty protocol which enables the advanced input detection.
Features Include:
- `TerminalDisplayBundle` automatically sets up a correctly-formatted render texture
- Post-process dithers colors to pure black and white, which are then printed as braille characters to the terminal
- Responsiveness to terminal window resizing
- `TerminalInput` resource which keeps track of pressed & released keys
- Keyboard input enhancements using kitty protocol
Future Goals:
- Find a way to integrate into a TUI library like ratatui for more interaction options.
- Move kitty enhancements to a feature maybe
## Screenshots
![](./doc/screenshot.png)
## Compatibility
| Crate Version | Bevy Version |
|--- |--- |
| 0.1 | 0.13 |
## Installation
### Using git URL in Cargo.toml
```toml
[dependencies.grex_terminal_display]
git = "https://github.com/exvacuum/grex_terminal_display.git"
```
## Example Usage
In `main.rs`:
```rs
use bevy::prelude::*;
use grex_terminal_display;
fn main() {
App::new()
.add_plugins((
DefaultPlugins.build().disable::<WinitPlugin>(),
ScheduleRunnerPlugin::run_loop(Duration::from_secs_f32(1.0 / 60.0)),
grex_terminal_display::TerminalDisplayPlugin,
))
.insert_resource(Msaa::Off) // For post-process
.run();
}
```
When spawning a camera:
```rs
let terminal_display_bundle = grex_terminal_display::components::TerminalDisplayBundle::new(3, &asset_server);
commands.spawn((
Camera3dBundle {
camera: Camera {
target: terminal_display_bundle.image_handle().into(),
..Default::default()
},
..Default::default()
},
terminal_display_bundle,
));
```

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use bevy::{
prelude::*,
render::render_resource::{
Extent3d, TextureDescriptor, TextureDimension, TextureFormat, TextureUsages,
},
};
use grex_dither_post_process::components::DitherPostProcessSettings;
use grex_framebuffer_extract::{
components::{ExtractFramebufferBundle, FramebufferExtractDestination},
render_assets::FramebufferExtractSource,
};
#[derive(Component)]
pub struct TerminalDisplay;
#[derive(Bundle)]
pub struct TerminalDisplayBundle {
_terminal_display: TerminalDisplay,
extract_framebuffer_bundle: ExtractFramebufferBundle,
dither_post_process_settings: DitherPostProcessSettings,
image_handle: Handle<Image>,
}
impl TerminalDisplayBundle {
pub fn new(dither_level: u32, asset_server: &AssetServer) -> Self {
let terminal_size = crossterm::terminal::size().unwrap();
let size = Extent3d {
width: (terminal_size.0 as u32) * 2,
height: (terminal_size.1 as u32) * 4,
depth_or_array_layers: 1,
};
let mut image = Image {
texture_descriptor: TextureDescriptor {
label: None,
size,
dimension: TextureDimension::D2,
format: TextureFormat::R8Unorm,
mip_level_count: 1,
sample_count: 1,
usage: TextureUsages::TEXTURE_BINDING
| TextureUsages::COPY_SRC
| TextureUsages::RENDER_ATTACHMENT,
view_formats: &[],
},
..default()
};
image.resize(size);
let image_handle = asset_server.add(image);
let framebuffer_extract_source =
asset_server.add(FramebufferExtractSource(image_handle.clone()));
Self {
_terminal_display: TerminalDisplay,
extract_framebuffer_bundle: ExtractFramebufferBundle {
source: framebuffer_extract_source,
dest: FramebufferExtractDestination::default(),
},
image_handle,
dither_post_process_settings: DitherPostProcessSettings::new(
dither_level,
asset_server,
),
}
}
pub fn image_handle(&self) -> Handle<Image> {
self.image_handle.clone()
}
}

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use bevy::prelude::*;
use crossterm::event::Event;
#[derive(Event)]
pub struct TerminalInputEvent(pub Event);

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use std::io::stdout;
use bevy::prelude::*;
use crossterm::{
event::PopKeyboardEnhancementFlags, terminal::disable_raw_mode, ExecutableCommand,
};
use grex_dither_post_process::DitherPostProcessPlugin;
use grex_framebuffer_extract::FramebufferExtractPlugin;
pub use crossterm::event::KeyCode;
pub mod components;
pub mod events;
pub mod resources;
mod systems;
pub struct TerminalDisplayPlugin;
impl Plugin for TerminalDisplayPlugin {
fn build(&self, app: &mut App) {
app.add_plugins((DitherPostProcessPlugin, FramebufferExtractPlugin))
.add_systems(Startup, systems::setup)
.add_systems(
Update,
(
systems::input_handling,
systems::resize_handling,
systems::print_to_terminal,
),
)
.insert_resource(resources::EventQueue::default())
.insert_resource(resources::TerminalInput::default())
.add_event::<events::TerminalInputEvent>();
}
}
impl Drop for TerminalDisplayPlugin {
fn drop(&mut self) {
let mut stdout = stdout();
stdout.execute(PopKeyboardEnhancementFlags).unwrap();
disable_raw_mode().unwrap();
}
}

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use std::sync::{Arc, Mutex};
use bevy::{prelude::*, utils::HashSet};
use crossterm::event::{Event, KeyCode};
#[derive(Resource, Default)]
pub struct TerminalInput {
pressed_keys: HashSet<KeyCode>,
released_keys: HashSet<KeyCode>,
}
impl TerminalInput {
pub fn is_pressed(&self, code: KeyCode) -> bool {
self.pressed_keys.contains(&code)
}
pub fn is_released(&self, code: KeyCode) -> bool {
self.released_keys.contains(&code)
}
pub(super) fn press(&mut self, code: KeyCode) {
if !self.is_pressed(code) {
self.pressed_keys.insert(code);
}
}
pub(super) fn release(&mut self, code: KeyCode) {
if self.is_pressed(code) {
self.pressed_keys.remove(&code);
}
if !self.is_released(code) {
self.released_keys.insert(code);
}
}
}
#[derive(Resource, Default)]
pub(super) struct EventQueue(pub(super) Arc<Mutex<Vec<Event>>>);

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use std::{
io::{stdout, Write},
usize,
};
use bevy::{
prelude::*,
render::render_resource::{Extent3d, TextureFormat},
};
use crossterm::{
cursor::{self, MoveTo},
event::{read, Event, KeyEventKind, KeyboardEnhancementFlags, PushKeyboardEnhancementFlags},
terminal::enable_raw_mode,
ExecutableCommand, QueueableCommand,
};
use grex_framebuffer_extract::{
components::FramebufferExtractDestination, render_assets::FramebufferExtractSource,
};
use crate::{
events::TerminalInputEvent,
resources::{EventQueue, TerminalInput},
};
const BRAILLE_CODE_MIN: u16 = 0x2800;
const BRAILLE_CODE_MAX: u16 = 0x28FF;
const BRAILLE_DOT_BIT_POSITIONS: [u8; 8] = [0, 1, 2, 6, 3, 4, 5, 7];
pub fn setup(event_queue: Res<EventQueue>) {
let event_queue = event_queue.0.clone();
std::thread::spawn(move || {
loop {
// `read()` blocks until an `Event` is available
match read() {
Ok(event) => {
event_queue.lock().unwrap().push(event);
}
Err(err) => {
panic!("Error reading input events: {:?}", err);
}
}
}
});
let mut stdout = stdout();
enable_raw_mode().expect("Failed to put terminal into raw mode");
let _ = stdout.execute(PushKeyboardEnhancementFlags(
KeyboardEnhancementFlags::REPORT_EVENT_TYPES,
));
let _ = stdout.execute(cursor::Hide);
}
pub fn print_to_terminal(image_exports: Query<&FramebufferExtractDestination>) {
for image_export in image_exports.iter() {
let mut image = image_export
.0
.lock()
.expect("Failed to get lock on output texture");
//TODO: Find a better way of preventing first frame
if image.size() == UVec2::ONE {
continue;
}
if image.texture_descriptor.format != TextureFormat::R8Unorm {
warn_once!("Extracted framebuffer texture is not R8Unorm format. Will attempt conversion, but consider changing your render texture's format.");
info_once!("{:?}", image);
match image.convert(TextureFormat::R8Unorm) {
Some(img) => *image = img,
None => error_once!(
"Could not convert to R8Unorm texture format. Unexpected output may occur."
),
};
}
let mut output_buffer = Vec::<char>::new();
let width = image.width();
let height = image.height();
let data = &image.data;
for character_y in (0..height).step_by(4) {
for character_x in (0..width).step_by(2) {
let mut mask: u8 = 0;
for offset_x in 0..2 {
for offset_y in 0..4 {
let x = character_x + offset_x;
let y = character_y + offset_y;
if x < width && y < height && data[(y * width + x) as usize] == 0xFF {
mask |= 1
<< (BRAILLE_DOT_BIT_POSITIONS[(offset_x * 4 + offset_y) as usize]);
}
}
}
output_buffer.push(braille_char(mask));
}
}
let string = output_buffer.into_iter().collect::<String>();
let mut stdout = stdout();
stdout.queue(MoveTo(0, 0)).unwrap();
stdout.write_all(string.as_bytes()).unwrap();
stdout.flush().unwrap();
}
}
fn braille_char(mask: u8) -> char {
match char::from_u32((BRAILLE_CODE_MIN + mask as u16) as u32) {
Some(character) => {
if character as u16 > BRAILLE_CODE_MAX {
panic!("Number too big!")
}
character
}
None => panic!("Error converting character!"),
}
}
pub fn input_handling(
event_queue: Res<EventQueue>,
mut input: ResMut<TerminalInput>,
mut event_writer: EventWriter<TerminalInputEvent>,
) {
let mut event_queue = event_queue.0.lock().unwrap();
while let Some(event) = event_queue.pop() {
if let Event::Key(event) = event {
match event.kind {
KeyEventKind::Press => {
input.press(event.code);
}
KeyEventKind::Release => {
input.release(event.code);
}
_ => (),
}
}
event_writer.send(TerminalInputEvent(event));
}
}
pub fn resize_handling(
mut images: ResMut<Assets<Image>>,
mut sources: ResMut<Assets<FramebufferExtractSource>>,
mut event_reader: EventReader<TerminalInputEvent>,
) {
for event in event_reader.read() {
if let Event::Resize(w, h) = event.0 {
for source in sources.iter_mut() {
let image = images.get_mut(&source.1 .0).unwrap();
image.resize(Extent3d {
width: w as u32 * 2,
height: h as u32 * 4,
depth_or_array_layers: 1,
});
}
}
}
}