#Tag · bonfire.cafe

Two cool blog posts about implementing memory-efficient ASTs (abstract syntax trees, the in-memory representation of programming languages) in #Rust

https://jhwlr.io/super-flat-ast/

https://www.cs.cornell.edu/~asampson/blog/flattening.html

The first is very similar to my implementation of the cuicui DSL (https://github.com/nicopap/cuicui_layout/blob/main/design_docs/ast.md) The second mentions #bevy, which reminds me of how many people in the bevy chat said the ECS would be a good storage for AST nodes (it would indeed, but the "super flat AST" is better)

nicopap

@nicopap@tooting.ch · 5 days ago

Two cool blog posts about implementing memory-efficient ASTs (abstract syntax trees, the in-memory representation of programming languages) in #Rust

https://jhwlr.io/super-flat-ast/

https://www.cs.cornell.edu/~asampson/blog/flattening.html

Jan :rust: :ferris: boosted

Caitlin

@mholiv@fosstodon.org · 4 weeks ago

This one covers porting to #bevy 0.17, moving to Avian for physics, and a lot of QoL fixed. #rust #GameDev #indiedev

Lots of images and videos in this one. https://exofactory.net/blog/2025-11-16/

Caitlin

@mholiv@fosstodon.org · 4 weeks ago

This one covers porting to #bevy 0.17, moving to Avian for physics, and a lot of QoL fixed. #rust #GameDev #indiedev

Lots of images and videos in this one. https://exofactory.net/blog/2025-11-16/

Jan :rust: :ferris: boosted

Alice I. Cecile

@alice_i_cecile@mastodon.gamedev.place · last month

Just posted this week's #bevymergetrain 😁 https://bsky.app/profile/did:plc:fjg6pzaigjmfpsfnbyp6m5oc/post/3m4qp6zgvzc2j

A fun mid-length train this week, with an unexpected subtheme on "how we can we easily allow users to migrate their code between versions". Thanks #bevy, it's always a pleasure to write these <3

https://bsky.app

View

Alice I. Cecile

@alice_i_cecile@mastodon.gamedev.place · last month

Just posted this week's #bevymergetrain 😁 https://bsky.app/profile/did:plc:fjg6pzaigjmfpsfnbyp6m5oc/post/3m4qp6zgvzc2j

A fun mid-length train this week, with an unexpected subtheme on "how we can we easily allow users to migrate their code between versions". Thanks #bevy, it's always a pleasure to write these <3

https://bsky.app

View

Marc boosted

Caitlin

@mholiv@fosstodon.org · 2 months ago

The Exofactory Demo is officially out. A ton of bugs have been fixed thanks to the testers during the soft launch period particularly on the #Linux build.

The game is written in #rust with #bevy and it’s been a great time. The game is releasing as part of Steam Next and the algorithm really matteres for #IndieGameDev so if you are interested in the game I would recommend checking and and playing the demo early this week if you can. (That and it’s fun). https://store.steampowered.com/app/3615720/Exofactory/

Marc and 2 others boosted

Caitlin

@mholiv@fosstodon.org · 2 months ago

The Exofactory demo has been soft launched and is available to download on Steam. So so so much work. Lots of game dev specific stuff in this one. If you play it do let me know if you see any major bugs. Lol. Will hard launch as part of Steam Next fest but you can play it now. #GameDev #rust #bevy https://exofactory.net/blog/2025-10-07/

Caitlin

@mholiv@fosstodon.org · 2 months ago

The Exofactory Demo is officially out. A ton of bugs have been fixed thanks to the testers during the soft launch period particularly on the #Linux build.

OliverUv boosted

Jérôme Humbert

@djee@mastodon.gamedev.place · 2 months ago

🎆 Bevy Hanabi v0.17.0 is out!

This new version is compatible with Bevy 0.17, but that's not all. It's also bringing some long awaited mechanism to detect when an effect is compiled on GPU and ready for simulation, and will prevent ticking spawners until then. This ensures one-shot/burst effects don't start before the GPU resources are ready, to avoid missing some particles!

https://github.com/djeedai/bevy_hanabi/blob/v0.17.0/CHANGELOG.md

📦https://crates.io/crates/bevy_hanabi/0.17.0
🦀https://github.com/djeedai/bevy_hanabi

#rustlang #bevy #bevy_hanabi #gamedev #vfx

Kat Marchán 🐈

@zkat@toot.cat · 2 months ago

Seeking feedback from Bevy and Big Brain users: how does this new API look?

Under the hood, this would be a high-performance, low-overhead API powered by Observers, but this is all you would actually need to write yourself.

I'm pretty sure I can get this to work with Bevy's current featureset, including the Very Fun async actions situation here.

#Bevy #BigBrain #GameAI #Rust #RustLang

#[derive(Debug, Default, Clone, Copy, Component)]
pub struct Thirsty;

#[scorer_for(Thirsty)]
pub fn score_thirsty(score: Score, thirsts: Query<&Thirst>) -> Score {
score.update(thirsts.get(score.actor()).unwrap().thirst)
}

#[derive(Debug, Clone, Copy, Component)]
pub struct Drink { rate: f32, per: Duration }
impl Default for Drink {
fn default() -> Self {
Self { rate: 0.5, per: Duration::from_millis(500), }
}
}

#[action_for(Drink)]
pub async fn drink_action(
action: Action<Drink>,
mut thirsts: Query<&mut Thirst>
) -> Result<(), ActionFailure> {
while let Ok(mut thirst) = thirsts.get(action.actor()) && thirst.thirst > 10.0 {
action.check_cancelled()?;
thirst.thirst -= action.data().rate;
action.sleep(action.data().per).await;
}
Ok(())
}

fn spawn_entity(cmd: &mut Commands) {
cmd.spawn((
Thirst(70.0, 2.0),
Thinker::new()
.picker(FirstToScore { threshold: 0.8 })
.when<Thirsty, Drink>(),
));
} — #[derive(Debug, Default, Clone, Copy, Component)] pub struct Thirsty; #[scorer_for(Thirsty)] pub fn score_thirsty(score: Score, thirsts: Query<&Thirst>) -> Score { score.update(thirsts.get(score.actor()).unwrap().thirst) } #[derive(Debug, Clone, Copy, Component)] pub struct Drink { rate: f32, per: Duration } impl Default for Drink { fn default() -> Self { Self { rate: 0.5, per: Duration::from_millis(500), } } } #[action_for(Drink)] pub async fn drink_action( action: Action<Drink>, mut thirsts: Query<&mut Thirst> ) -> Result<(), ActionFailure> { while let Ok(mut thirst) = thirsts.get(action.actor()) && thirst.thirst > 10.0 { action.check_cancelled()?; thirst.thirst -= action.data().rate; action.sleep(action.data().per).await; } Ok(()) } fn spawn_entity(cmd: &mut Commands) { cmd.spawn(( Thirst(70.0, 2.0), Thinker::new() .picker(FirstToScore { threshold: 0.8 }) .when<Thirsty, Drink>(), )); }

Federation Bot

@Federation_Bot replied · 2 months ago

Big Brain, btw, is designed to be data-oriented, so I might provide an API that lets you define game AI in .kdl files that look like this. It could also, for example, eventually use a hypothetical node editor (thing Blender Geometry Nodes), to define the same data.

#KDL #Bevy #BigBrain #GameAI

Thinker {
picker FirstToScore threshold=0.8
when Thirsty {
GoToWater
Drink
}
when Hungry {
Eat
}
or Bored Paranoid {
Thinker {
when EnemySpotted {
ShootEnemy
}
when FlowersSpotted {
WalkToFlowers
PickAFlower
SmellFlower
}
otherwise {
Parallel {
Wander
HumATune
}
}
}
}
} — Thinker { picker FirstToScore threshold=0.8 when Thirsty { GoToWater Drink } when Hungry { Eat } or Bored Paranoid { Thinker { when EnemySpotted { ShootEnemy } when FlowersSpotted { WalkToFlowers PickAFlower SmellFlower } otherwise { Parallel { Wander HumATune } } } } }

Kat Marchán 🐈

@zkat@toot.cat · 2 months ago

FYI: As part of a larger move away from GitHub, I've archived Big Brain on it and moved all future development over to Codeberg, at https://codeberg.org/zkat/big-brain

Please use that repo from now on.

Additionally: I am in the process of trying a major rewrite of the crate that I'm hoping will be much simpler, and much more efficient, thanks to features now available in recent version of Bevy! I'm very excited :)

#GiveUpGitHub #GitHub #Bevy #Rust #RustLang #Codeberg

Kat Marchán 🐈

@zkat@toot.cat replied · 2 months ago

Seeking feedback from Bevy and Big Brain users: how does this new API look?

Under the hood, this would be a high-performance, low-overhead API powered by Observers, but this is all you would actually need to write yourself.

I'm pretty sure I can get this to work with Bevy's current featureset, including the Very Fun async actions situation here.

#Bevy #BigBrain #GameAI #Rust #RustLang

Jérôme Humbert

@djee@mastodon.gamedev.place · 2 months ago

🎆 Bevy Hanabi v0.17.0 is out!

https://github.com/djeedai/bevy_hanabi/blob/v0.17.0/CHANGELOG.md

📦https://crates.io/crates/bevy_hanabi/0.17.0
🦀https://github.com/djeedai/bevy_hanabi

#rustlang #bevy #bevy_hanabi #gamedev #vfx

Kat Marchán 🐈

@zkat@toot.cat · 2 months ago

FYI: As part of a larger move away from GitHub, I've archived Big Brain on it and moved all future development over to Codeberg, at https://codeberg.org/zkat/big-brain

Please use that repo from now on.

#GiveUpGitHub #GitHub #Bevy #Rust #RustLang #Codeberg

Caitlin

@mholiv@fosstodon.org · 2 months ago

Kat Marchán 🐈

@zkat@toot.cat · 2 months ago

I'm just gonna keep waiting until the Bevy Editor finally comes out to try and write a game with the engine in earnest. I keep getting ideas but I just don't really wanna deal with writing something as complex and difficult as a game, with my hands tied behind my back any more than I have to.

that said, I'll probably be poking around the ecosystem sometime soon, after reading those updates on the observers in 0.17. They would make big-brain so much nicer to use, and probably simplify the implementation a lot (it would probably be a full rewrite?)

#bevy #bigbrain #gamedev #rust #rustlang