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crates/bevy_gltf_component_refs/Cargo.toml Normal file
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[package]
name = "bevy_gltf_component_refs"
version = "0.1.0"
authors = ["Mark 'kaosat-dev' Moissette"]
description = "Allows you to add reference components inside gltf files to relate components to each other on the Bevy side."
homepage = "https://github.com/kaosat-dev/Blender_bevy_components_workflow"
repository = "https://github.com/kaosat-dev/Blender_bevy_components_workflow"
keywords = ["gamedev", "bevy", "assets", "gltf", "components"]
categories = ["game-development"]
edition = "2021"
license = "MIT OR Apache-2.0"
[lints]
workspace = true
[dependencies]
bevy = { version = "0.13", default-features = false, features = ["bevy_scene"] }
bevy_gltf_components = { version = "0.5", path = "../bevy_gltf_components" }
[dev-dependencies]
bevy = { version = "0.13", default-features = false, features = [
"dynamic_linking",
] }

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crates/bevy_gltf_component_refs/LICENSE.md Normal file
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This crate is available under either:
* The [MIT License](./LICENSE_MIT)
* The [Apache License, Version 2.0](./LICENSE_APACHE)

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crates/bevy_gltf_component_refs/LICENSE_APACHE.md Normal file
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Copyright [2023] [Mark "kaosat-dev" Moissette]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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crates/bevy_gltf_component_refs/LICENSE_MIT.md Normal file
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MIT License
Copyright (c) 2023 Mark "kaosat-dev" Moissette
Permission is hereby granted, free of charge, to any person obtaining a copy
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SOFTWARE.

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crates/bevy_gltf_component_refs/src/lib.rs Normal file
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use bevy::{
app::{App, Plugin},
ecs::{
component::Component,
entity::Entity,
query::With,
reflect::ReflectComponent,
schedule::{IntoSystemConfigs, IntoSystemSetConfigs, SystemSet},
system::{Commands, Query, Res, ResMut, Resource, SystemParam},
},
hierarchy::{HierarchyQueryExt, Parent},
log::warn,
prelude::Update,
reflect::{Reflect, TypePath},
scene::SceneInstance,
utils::HashMap,
};
use bevy_gltf_components::GltfComponentsSet;
use std::marker::PhantomData;
/// Plugin for keeping the GltfRefMap in sync.
pub struct GltfRefMapPlugin;
impl Plugin for GltfRefMapPlugin {
fn build(&self, app: &mut App) {
app.register_type::<GltfRefTarget>()
.init_resource::<GltfRefMap>()
.configure_sets(
Update,
(GltfRefsSet::CreateRefMap, GltfRefsSet::ResolveRefs)
.chain()
.after(GltfComponentsSet::Injection),
)
.add_systems(
Update,
GltfRefMap::create_ref_map.in_set(GltfRefsSet::CreateRefMap),
);
}
}
#[derive(SystemSet, Debug, Hash, PartialEq, Eq, Clone)]
/// SystemSet to order your systems based on when references are resolved.
pub enum GltfRefsSet {
/// Systems that create the [`GltfRefMap`] for that frame.
CreateRefMap,
/// Systems that resolve references using the [`GltfRefMap`]. For types that
/// need to have references manually resolved, prefer to put their systems
/// here.
ResolveRefs,
}
#[derive(Component, Reflect)]
#[reflect(Component)]
struct GltfRefTarget(String);
/// A map of references for Gltf instances.
#[derive(Resource, Default)]
pub struct GltfRefMap(HashMap<Entity, HashMap<String, Entity>>);
impl GltfRefMap {
/// Gets an entity given its `gltf_root` and `ref_name`. A reference is
/// only valid on the same frame that the Gltf is spawned in. In other
/// words, after that same frame, any references on `gltf_root` will return
/// None.
pub fn get_ref(&self, gltf_root: Entity, ref_name: &String) -> Option<Entity> {
self.0.get(&gltf_root)?.get(ref_name).copied()
}
fn create_ref_map(
ref_targets: Query<(Entity, &GltfRefTarget)>,
gltf_for_entity: GltfForEntity,
mut ref_map: ResMut<GltfRefMap>,
mut commands: Commands,
) {
ref_map.0.clear();
for (entity, ref_target) in ref_targets.iter() {
commands.entity(entity).remove::<GltfRefTarget>();
let Some(gltf_root) = gltf_for_entity.find_gltf_root(entity) else {
warn!("Entity {entity:?} is not part of a Gltf but contains a GltfRefTarget (target={}).", ref_target.0);
continue;
};
ref_map
.0
.entry(gltf_root)
.or_default()
.insert(ref_target.0.clone(), entity);
}
}
}
#[derive(Component, Reflect)]
#[reflect(Component)]
struct GltfRef<T: Component> {
target: String,
#[reflect(ignore)]
_marker: PhantomData<T>,
}
impl<T: Component> GltfRef<T>
where
Entity: Into<T>,
{
fn system(
refs: Query<(Entity, &Self)>,
gltf_for_entity: GltfForEntity,
ref_map: Res<GltfRefMap>,
mut commands: Commands,
) {
for (entity, gltf_ref) in refs.iter() {
commands.entity(entity).remove::<Self>();
let Some(gltf_root) = gltf_for_entity.find_gltf_root(entity) else {
warn!("GltfRef should only be on descendants of a Gltf.");
continue;
};
match ref_map.get_ref(gltf_root, &gltf_ref.target) {
Some(target) => {
commands.entity(entity).insert(Into::<T>::into(target));
}
None => {
warn!(
"Entity {entity:?} attempted to reference '{}' in gltf {gltf_root:?}",
&gltf_ref.target
);
}
}
}
}
}
/// Plugin for automatically converting [`GltfRef`]s into their corresponding
/// `T`.
pub struct GltfRefPlugin<T: Component + TypePath>(PhantomData<T>);
impl<T: Component + TypePath> Plugin for GltfRefPlugin<T>
where
Entity: Into<T>,
{
fn build(&self, app: &mut App) {
app.register_type::<GltfRef<T>>().add_systems(
Update,
GltfRef::<T>::system.in_set(GltfRefsSet::ResolveRefs),
);
}
}
// Manual implementation of Default for GltfRefPlugin to avoid `Default` trait
// bounds on `T`.
impl<T: Component + TypePath> Default for GltfRefPlugin<T>
where
Entity: Into<T>,
{
fn default() -> Self {
Self(Default::default())
}
}
/// SystemParam to find the Gltf that an entity belongs to.
#[derive(SystemParam)]
pub struct GltfForEntity<'w, 's> {
gltfs: Query<'w, 's, (), With<SceneInstance>>,
hierarchy: Query<'w, 's, &'static Parent>,
}
impl<'w, 's> GltfForEntity<'w, 's> {
/// Finds the Gltf root for `entity`. Returns None if `entity` does not
/// belong to a Gltf.
pub fn find_gltf_root(&self, entity: Entity) -> Option<Entity> {
for entity in std::iter::once(entity).chain(self.hierarchy.iter_ancestors(entity)) {
if self.gltfs.contains(entity) {
return Some(entity);
}
}
None
}
}