Awesome
bevy_ratatui_render
Bevy inside the terminal!
Uses bevy headless rendering, ratatui, and ratatui_image to print the rendered output of your bevy application to the terminal using unicode halfblocks.
<p float="left"> <img src="https://assets.cxreiff.com/github/cube.gif" width="30%" alt="cube"> <img src="https://assets.cxreiff.com/github/foxes.gif" width="30%" alt="foxes"> <img src="https://assets.cxreiff.com/github/sponza.gif" width="30%" alt="sponza test scene"> <p>examples/cube.rs, bevy many_foxes example, sponza test scene
Use bevy_ratatui for setting ratatui up and receiving terminal events (keyboard, focus, mouse, paste, resize) inside bevy.
getting started
cargo add bevy_ratatui_render bevy_ratatui
fn main() {
App::new()
.add_plugins((
// disable WinitPlugin as it panics in environments without a display server
// disable LogPlugin as it interferes with terminal output.
DefaultPlugins.build()
.disable::<WinitPlugin>()
.disable::<LogPlugin>(),
// create windowless loop and set its frame rate
ScheduleRunnerPlugin::run_loop(Duration::from_secs_f64(1. / 60.)),
// set up the Ratatui context and forward input events
RatatuiPlugins::default(),
// connect a bevy camera target to a ratatui widget
RatatuiRenderPlugin::new("main", (256, 256)),
))
.add_systems(Startup, setup_scene_system)
.add_systems(Update, draw_scene_system.map(error))
.run();
}
fn setup_scene_system(
mut commands: Commands,
ratatui_render: Res<RatatuiRenderContext>,
) {
// spawn objects into your scene
...
commands.spawn(Camera3dBundle {
camera: Camera {
target: ratatui_render.target("main").unwrap(),
..default()
},
..default()
});
}
fn draw_scene_system(
mut ratatui: ResMut<RatatuiContext>,
ratatui_render: Res<RatatuiRenderContext>,
) -> io::Result<()> {
ratatui.draw(|frame| {
frame.render_widget(ratatui_render.widget("main").unwrap(), frame.size());
})?;
Ok(())
}
As shown above, RatatuiRenderPlugin
makes a RatatuiRenderContext
resource available that has two
primary methods:
target(id)
: Provides a bevyRenderTarget
that can be set as thetarget
of a normal bevy camera.widget(id)
: Provides a ratatui widget that prints the latest render made to the corresponding camera, as unicode half-blocks.
There is a convenience function if you do not need access to the ratatui draw loop and just would
like the render to print to the full terminal (for the above example, use this instead of adding the
draw_scene_system
):
RatatuiRenderPlugin::new("main", (256, 256)).print_full_terminal()
There is another convenience function for autoresizing the render texture to match the terminal dimensions, during startup and when the terminal is resized:
RatatuiRenderPlugin::new("main", (1, 1)).autoresize()
To customize how the texture dimensions are calculated from the terminal dimensions, provide a callback
to autoresize_conversion_fn
:
RatatuiRenderPlugin::new("main", (1, 1))
.autoresize()
.autoresize_conversion_fn(|(width, height)| (width * 4, height * 3))
multiple renders
RatatuiRenderPlugin
can be added to bevy multiple times. To access the correct render, use the same
string id you passed into RatatuiRenderPlugin::new(id, dimensions)
to call the target(id)
and
widget(id)
methods on the RatatuiRenderContext
resource.
supported terminals
Printing to terminal relies on the terminal supporting 24-bit color. I've personally tested and confirmed that the following terminals display correctly:
- Alacritty
- Kitty
- iTerm
- WezTerm
...but any terminal with 24-bit color support should work fine, if its performance is adequate.
compatibility
bevy | bevy_ratatui_render |
---|---|
0.14 | 0.5 |
0.13 | 0.4 |
credits
- Headless rendering code adapted from bevy's headless_render example (@bugsweeper, @alice-i-cecile, @mockersf).
- bevy's many_foxes example used for example gif.
- bevy_sponza_scene used for example gif.