bevy_sync 0.19.0

use bevy_reflect::{
    PartialReflect, ReflectFromReflect, TypeRegistry,
    serde::{ReflectDeserializer, ReflectSerializer},
};
use bincode::{de::read::SliceReader, error::EncodeError, serde::OwnedSerdeDecoder};
use serde::de::DeserializeSeed;

pub(crate) const BINCODE_OPTIONS: bincode::config::Configuration<
    bincode::config::BigEndian,
    bincode::config::Fixint,
> = bincode::config::standard()
    .with_big_endian()
    .with_fixed_int_encoding();

pub(crate) fn reflect_to_bin(
    compo: &dyn PartialReflect,
    registry: &TypeRegistry,
) -> Result<Vec<u8>, EncodeError> {
    let serializer = ReflectSerializer::new(compo, registry);
    bincode::serde::encode_to_vec(&serializer, BINCODE_OPTIONS)
}

pub(crate) fn bin_to_reflect(data: &[u8], registry: &TypeRegistry) -> Box<dyn PartialReflect> {
    let reflect_deserializer = ReflectDeserializer::new(registry);
    let mut bin_deser = OwnedSerdeDecoder::from_reader(SliceReader::new(data), BINCODE_OPTIONS);
    let data = reflect_deserializer
        .deserialize(bin_deser.as_deserializer())
        .unwrap();
    let type_path = data.get_represented_type_info().unwrap().type_path();
    let registration = registry.get_with_type_path(type_path).unwrap();
    let rfr = registry
        .get_type_data::<ReflectFromReflect>(registration.type_id())
        .unwrap();
    rfr.from_reflect(&*data).unwrap().into_partial_reflect()
}

#[cfg(test)]
mod test {
    use super::*;
    use bevy_asset::Handle;
    use bevy_color::Color;
    use bevy_ecs::component::Component;
    use bevy_image::Image;
    use bevy_math::{Quat, Vec3};
    use bevy_pbr::ParallaxMappingMethod;
    use bevy_pbr::StandardMaterial;
    use bevy_reflect::{GetTypeRegistration, Reflect, ReflectFromReflect, TypeRegistry};
    use bevy_transform::components::Transform;
    use serde::{Deserialize, Serialize};

    #[derive(Component, Default, PartialEq, Serialize, Deserialize, Debug, Reflect)]
    struct MyCompo {
        value: i32,
        name: String,
    }

    fn check_serialize_and_back<T>(compo_orig: &T)
    where
        T: Reflect + GetTypeRegistration + PartialEq + std::fmt::Debug,
    {
        let mut registry = TypeRegistry::default();
        registry.register::<T>();

        let data = reflect_to_bin(compo_orig.as_partial_reflect(), &registry).unwrap();

        let compo_result = bin_to_reflect(&data, &registry);
        let compo_result = compo_result.try_downcast::<T>().unwrap();

        assert_eq!(*compo_result, *compo_orig);
    }

    #[test]
    fn compo_data_serde() {
        check_serialize_and_back::<MyCompo>(&MyCompo {
            value: 3,
            name: String::from("name"),
        });
    }

    #[test]
    fn compo_data_serde_bevy_native_component() {
        let compo_orig = Transform::default();

        let mut registry = TypeRegistry::default();
        registry.register::<Transform>();
        registry.register::<Vec3>();
        registry.register::<Quat>();
        registry.register_type_data::<Transform, ReflectFromReflect>();
        registry.register_type_data::<Vec3, ReflectFromReflect>();
        registry.register_type_data::<Quat, ReflectFromReflect>();

        let data = reflect_to_bin(compo_orig.as_partial_reflect(), &registry).unwrap();

        let compo_result = bin_to_reflect(&data, &registry);
        let compo_result = compo_result.try_downcast::<Transform>().unwrap();

        assert_eq!(*compo_result, compo_orig);
    }

    #[test]
    fn material_serde() {
        let material_orig = StandardMaterial {
            base_color: Color::srgb(1.0, 0.0, 0.0),
            ..StandardMaterial::default()
        };

        let mut registry = TypeRegistry::default();
        registry.register::<StandardMaterial>();
        registry.register::<Color>();
        registry.register::<Image>();
        registry.register::<Handle<Image>>();
        registry.register::<Option<Handle<Image>>>();
        registry.register::<ParallaxMappingMethod>();
        registry.register_type_data::<StandardMaterial, ReflectFromReflect>();

        let data = reflect_to_bin(material_orig.as_partial_reflect(), &registry).unwrap();

        let result = bin_to_reflect(&data, &registry);
        let result = result.try_downcast::<StandardMaterial>().unwrap();

        assert_eq!(result.base_color, material_orig.base_color);
    }

    #[test]
    fn reflect_material_no_dependencies() {
        let compo = StandardMaterial {
            base_color: Color::srgb(1.0, 0.0, 0.0),
            ..StandardMaterial::default()
        };

        let mut registry = TypeRegistry::default();
        registry.register::<StandardMaterial>();
        registry.register::<Color>();
        registry.register::<Image>();
        registry.register::<Handle<Image>>();
        registry.register::<Option<Handle<Image>>>();
        registry.register::<ParallaxMappingMethod>();

        // compo_to_bin inlined
        let serializer = ReflectSerializer::new(compo.as_partial_reflect(), &registry);
        let result = bincode::serde::encode_to_vec(&serializer, BINCODE_OPTIONS).unwrap();

        let result = bin_to_reflect(&result, &registry);
        let result = result.try_downcast::<StandardMaterial>().unwrap();
        assert_eq!(compo.base_color, result.base_color);
    }
}