11 releases (6 breaking)
0.7.0 | Nov 3, 2024 |
---|---|
0.6.0 | May 8, 2024 |
0.5.1 | May 3, 2024 |
0.4.0 | Apr 29, 2024 |
0.1.1 | Apr 20, 2024 |
#216 in Game dev
145 downloads per month
75KB
1.5K
SLoC
bevy_logic
A logic gate simulation plugin for bevy
.
Features
- A
LogicGraph
resource for sorting (potentially cyclic) logic gate circuits. - A fixed timestep
LogicUpdate
schedule that works just like bevy'sFixedUpdate
. - A ternary approach to
Signal
, enabling non-boolean circuits and analog machines. LogicGate
trait queries.- Builder traits for
World
andCommands
that ease gate hierarchy construction. Command
s for synchronizing a graph with the game world.- Modular plugin design. Pick and choose which features you need.
Running examples
cargo run --release --example cycles
Quickstart
Add the LogicSimulationPlugin
to your app, and configure the Time<LogicStep>
resource
to tick at the desired speed.
const STEPS_PER_SECOND: f64 = 30.0;
app.add_plugins(LogicSimulationPlugin)
.insert_resource(Time::<LogicStep>::from_hz(STEPS_PER_SECOND));
Custom logic gates
You can create your own logic gates by implementing the LogicGate
trait...
use bevy_logic::prelude::*;
/// The XOR gate emits a signal if the number of "truthy" inputs is odd.
#[derive(Component, Clone, Copy, Debug, Default, Reflect)]
pub struct XorGate;
impl LogicGate for XorGate {
fn evaluate(&mut self, inputs: &[Signal], outputs: &mut [Signal]) {
let signal: Signal = inputs
.iter()
.filter(|s| s.is_truthy())
.count()
.is_odd()
.into();
outputs.set_all(signal);
}
}
And then registering the component with bevy_trait_query
...
struct CustomLogicPlugin;
impl Plugin for CustomLogicPlugin {
fn build(&self, app: &mut App) {
app.register_logic_gate::<XorGate>();
}
}
You can use the logic::commands
module to spawn gates and fans,
and then connect fans with wires. Make sure to compile()
the logic graph.
fn spawn_custom_gate(mut commands: Commands, mut sim: ResMut<LogicGraph>) {
let xor_gate = commands
.spawn_gate((Name::new("XOR"), XorGate))
.with_inputs(2)
.with_outputs(1)
.build();
let not_gate = commands
.spawn_gate((Name::new("NOT"), NotGate))
.with_inputs(1)
.with_outputs(1)
.build();
let wire = commands.spawn_wire(¬_gate, 0, &xor_gate, 0).downgrade();
sim.add_data(vec![xor_gate, not_gate]).add_data(wire).compile();
}
Bevy Compatibility
bevy |
bevy_logic |
---|---|
0.14 | 0.7.x |
0.13.2 | 0.6.x |
Dependencies
~25MB
~464K SLoC