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use bevy_app::{App, Plugin, PostStartup, PostUpdate};
use bevy_ecs::schedule::{IntoSystemConfigs, IntoSystemSetConfigs, SystemSet};
use bevy_hierarchy::ValidParentCheckPlugin;
use crate::{
prelude::{GlobalTransform, Transform},
systems::{propagate_transforms, sync_simple_transforms},
};
/// Set enum for the systems relating to transform propagation
#[derive(Debug, Hash, PartialEq, Eq, Clone, SystemSet)]
pub enum TransformSystem {
/// Propagates changes in transform to children's [`GlobalTransform`]
TransformPropagate,
}
/// The base plugin for handling [`Transform`] components
#[derive(Default)]
pub struct TransformPlugin;
impl Plugin for TransformPlugin {
fn build(&self, app: &mut App) {
// A set for `propagate_transforms` to mark it as ambiguous with `sync_simple_transforms`.
// Used instead of the `SystemTypeSet` as that would not allow multiple instances of the system.
#[derive(Debug, Hash, PartialEq, Eq, Clone, SystemSet)]
struct PropagateTransformsSet;
app.register_type::<Transform>()
.register_type::<GlobalTransform>()
.add_plugins(ValidParentCheckPlugin::<GlobalTransform>::default())
.configure_sets(
PostStartup,
PropagateTransformsSet.in_set(TransformSystem::TransformPropagate),
)
// add transform systems to startup so the first update is "correct"
.add_systems(
PostStartup,
(
sync_simple_transforms
.in_set(TransformSystem::TransformPropagate)
// FIXME: https://github.com/bevyengine/bevy/issues/4381
// These systems cannot access the same entities,
// due to subtle query filtering that is not yet correctly computed in the ambiguity detector
.ambiguous_with(PropagateTransformsSet),
propagate_transforms.in_set(PropagateTransformsSet),
),
)
.configure_sets(
PostUpdate,
PropagateTransformsSet.in_set(TransformSystem::TransformPropagate),
)
.add_systems(
PostUpdate,
(
sync_simple_transforms
.in_set(TransformSystem::TransformPropagate)
.ambiguous_with(PropagateTransformsSet),
propagate_transforms.in_set(PropagateTransformsSet),
),
);
}
}