mirror of
https://github.com/bevyengine/bevy
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Add macro to implement reflect for struct types and migrate glam types (#4540)
# Objective Relevant issue: #4474 Currently glam types implement Reflect as a value, which is problematic for reflection, making scripting/editor work much more difficult. This PR re-implements them as structs. ## Solution Added a new proc macro, `impl_reflect_struct`, which replaces `impl_reflect_value` and `impl_from_reflect_value` for glam types. This macro could also be used for other types, but I don't know of any that would require it. It's specifically useful for foreign types that cannot derive Reflect normally. --- ## Changelog ### Added - `impl_reflect_struct` proc macro ### Changed - Glam reflect impls have been replaced with `impl_reflect_struct` - from_reflect's `impl_struct` altered to take an optional custom constructor, allowing non-default non-constructible foreign types to use it - Calls to `impl_struct` altered to conform to new signature - Altered glam types (All vec/mat combinations) have a different serialization structure, as they are reflected differently now. ## Migration Guide This will break altered glam types serialized to RON scenes, as they will expect to be serialized/deserialized as structs rather than values now. A future PR to add custom serialization for non-value types is likely on the way to restore previous behavior. Additionally, calls to `impl_struct` must add a `None` parameter to the end of the call to restore previous behavior. Co-authored-by: PROMETHIA-27 <42193387+PROMETHIA-27@users.noreply.github.com>
This commit is contained in:
PROMETHIA-27
parent
38a940dbbe
commit
aced6aff04
4 changed files with 470 additions and 50 deletions
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@ -8,6 +8,7 @@ pub fn impl_struct(
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bevy_reflect_path: &Path,
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active_fields: &[(&Field, usize)],
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ignored_fields: &[(&Field, usize)],
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custom_constructor: Option<proc_macro2::TokenStream>,
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) -> TokenStream {
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let field_names = active_fields
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.iter()
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@ -60,20 +61,35 @@ pub fn impl_struct(
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#(#field_types: #bevy_reflect_path::FromReflect,)*
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});
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let constructor = if let Some(constructor) = custom_constructor {
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quote!(
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let mut value: Self = #constructor;
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#(
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value.#field_idents = {
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<#field_types as #bevy_reflect_path::FromReflect>::from_reflect(#bevy_reflect_path::Struct::field(ref_struct, #field_names)?)?
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};
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)*
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Some(value)
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)
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} else {
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quote!(
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Some(
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Self {
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#(#field_idents: {
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<#field_types as #bevy_reflect_path::FromReflect>::from_reflect(#bevy_reflect_path::Struct::field(ref_struct, #field_names)?)?
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},)*
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#(#ignored_field_idents: Default::default(),)*
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}
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)
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)
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};
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TokenStream::from(quote! {
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impl #impl_generics #bevy_reflect_path::FromReflect for #struct_name #ty_generics #where_from_reflect_clause
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{
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fn from_reflect(reflect: &dyn #bevy_reflect_path::Reflect) -> Option<Self> {
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use #bevy_reflect_path::Struct;
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if let #bevy_reflect_path::ReflectRef::Struct(ref_struct) = reflect.reflect_ref() {
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Some(
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Self{
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#(#field_idents: {
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<#field_types as #bevy_reflect_path::FromReflect>::from_reflect(ref_struct.field(#field_names)?)?
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},)*
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#(#ignored_field_idents: Default::default(),)*
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}
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)
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#constructor
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} else {
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None
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}
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@ -287,8 +287,7 @@ fn impl_struct(
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#[inline]
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fn clone_value(&self) -> Box<dyn #bevy_reflect_path::Reflect> {
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use #bevy_reflect_path::Struct;
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Box::new(self.clone_dynamic())
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Box::new(#bevy_reflect_path::Struct::clone_dynamic(self))
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}
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#[inline]
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fn set(&mut self, value: Box<dyn #bevy_reflect_path::Reflect>) -> Result<(), Box<dyn #bevy_reflect_path::Reflect>> {
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@ -298,11 +297,10 @@ fn impl_struct(
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#[inline]
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fn apply(&mut self, value: &dyn #bevy_reflect_path::Reflect) {
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use #bevy_reflect_path::Struct;
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if let #bevy_reflect_path::ReflectRef::Struct(struct_value) = value.reflect_ref() {
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for (i, value) in struct_value.iter_fields().enumerate() {
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let name = struct_value.name_at(i).unwrap();
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self.field_mut(name).map(|v| v.apply(value));
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#bevy_reflect_path::Struct::field_mut(self, name).map(|v| v.apply(value));
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}
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} else {
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panic!("Attempted to apply non-struct type to struct type.");
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@ -607,6 +605,204 @@ pub fn impl_reflect_value(input: TokenStream) -> TokenStream {
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)
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}
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/// Represents the information needed to implement a type as a Reflect Struct.
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///
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/// # Example
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/// ```ignore
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/// impl_reflect_struct!(
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/// // attrs
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/// // |----------------------------------------|
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/// #[reflect(PartialEq, Serialize, Deserialize, Default)]
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/// // type_name generics
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/// // |-------------------||----------|
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/// struct ThingThatImReflecting<T1, T2, T3> {
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/// x: T1, // |
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/// y: T2, // |- fields
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/// z: T3 // |
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/// }
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/// );
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/// ```
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struct ReflectStructDef {
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type_name: Ident,
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generics: Generics,
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attrs: ReflectAttrs,
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fields: Fields,
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}
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impl Parse for ReflectStructDef {
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fn parse(input: ParseStream) -> syn::Result<Self> {
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let ast = input.parse::<DeriveInput>()?;
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let type_name = ast.ident;
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let generics = ast.generics;
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let fields = match ast.data {
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Data::Struct(data) => data.fields,
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Data::Enum(data) => {
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return Err(syn::Error::new_spanned(
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data.enum_token,
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"Enums are not currently supported for reflection",
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))
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}
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Data::Union(data) => {
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return Err(syn::Error::new_spanned(
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data.union_token,
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"Unions are not supported for reflection",
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))
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}
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};
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let mut attrs = ReflectAttrs::default();
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for attribute in ast.attrs.iter().filter_map(|attr| attr.parse_meta().ok()) {
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let meta_list = if let Meta::List(meta_list) = attribute {
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meta_list
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} else {
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continue;
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};
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if let Some(ident) = meta_list.path.get_ident() {
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if ident == REFLECT_ATTRIBUTE_NAME || ident == REFLECT_VALUE_ATTRIBUTE_NAME {
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attrs = ReflectAttrs::from_nested_metas(&meta_list.nested);
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}
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}
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}
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Ok(Self {
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type_name,
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generics,
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attrs,
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fields,
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})
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}
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}
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/// A replacement for `#[derive(Reflect)]` to be used with foreign types which
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/// the definitions of cannot be altered.
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///
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/// This macro is an alternative to [`impl_reflect_value!`] and [`impl_from_reflect_value!`]
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/// which implement foreign types as Value types. Note that there is no `impl_from_reflect_struct`,
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/// as this macro will do the job of both. This macro implements them as `Struct` types,
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/// which have greater functionality. The type being reflected must be in scope, as you cannot
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/// qualify it in the macro as e.g. `bevy::prelude::Vec3`.
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///
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/// It may be necessary to add `#[reflect(Default)]` for some types, specifically non-constructible
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/// foreign types. Without `Default` reflected for such types, you will usually get an arcane
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/// error message and fail to compile. If the type does not implement `Default`, it may not
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/// be possible to reflect without extending the macro.
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///
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/// # Example
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/// Implementing `Reflect` for `bevy::prelude::Vec3` as a struct type:
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/// ```ignore
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/// use bevy::prelude::Vec3;
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///
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/// impl_reflect_struct!(
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/// #[reflect(PartialEq, Serialize, Deserialize, Default)]
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/// struct Vec3 {
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/// x: f32,
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/// y: f32,
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/// z: f32
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/// }
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/// );
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/// ```
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#[proc_macro]
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pub fn impl_reflect_struct(input: TokenStream) -> TokenStream {
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let ReflectStructDef {
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type_name,
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generics,
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attrs,
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fields,
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} = parse_macro_input!(input as ReflectStructDef);
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let bevy_reflect_path = BevyManifest::default().get_path("bevy_reflect");
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let fields_and_args = fields
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.iter()
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.enumerate()
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.map(|(i, f)| {
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(
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f,
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f.attrs
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.iter()
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.find(|a| *a.path.get_ident().as_ref().unwrap() == REFLECT_ATTRIBUTE_NAME)
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.map(|a| {
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syn::custom_keyword!(ignore);
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let mut attribute_args = PropAttributeArgs { ignore: None };
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a.parse_args_with(|input: ParseStream| {
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if input.parse::<Option<ignore>>()?.is_some() {
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attribute_args.ignore = Some(true);
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return Ok(());
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}
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Ok(())
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})
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.expect("Invalid 'property' attribute format.");
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attribute_args
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}),
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i,
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)
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})
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.collect::<Vec<(&Field, Option<PropAttributeArgs>, usize)>>();
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let active_fields = fields_and_args
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.iter()
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.filter(|(_field, attrs, _i)| {
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attrs.is_none()
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|| match attrs.as_ref().unwrap().ignore {
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Some(ignore) => !ignore,
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None => true,
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}
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})
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.map(|(f, _attr, i)| (*f, *i))
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.collect::<Vec<(&Field, usize)>>();
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let ignored_fields = fields_and_args
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.iter()
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.filter(|(_field, attrs, _i)| {
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attrs
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.as_ref()
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.map(|attrs| attrs.ignore.unwrap_or(false))
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.unwrap_or(false)
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})
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.map(|(f, _attr, i)| (*f, *i))
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.collect::<Vec<(&Field, usize)>>();
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let constructor = if attrs
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.data
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.contains(&Ident::new("ReflectDefault", Span::call_site()))
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{
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Some(quote! { Default::default() })
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} else {
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None
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};
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let registration_data = &attrs.data;
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let get_type_registration_impl =
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impl_get_type_registration(&type_name, &bevy_reflect_path, registration_data, &generics);
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let impl_struct: proc_macro2::TokenStream = impl_struct(
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&type_name,
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&generics,
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&get_type_registration_impl,
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&bevy_reflect_path,
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&attrs,
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&active_fields,
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)
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.into();
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let impl_from_struct: proc_macro2::TokenStream = from_reflect::impl_struct(
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&type_name,
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&generics,
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&bevy_reflect_path,
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&active_fields,
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&ignored_fields,
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constructor,
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)
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.into();
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TokenStream::from(quote! {
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#impl_struct
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#impl_from_struct
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})
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}
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#[derive(Default)]
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struct ReflectAttrs {
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reflect_hash: TraitImpl,
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@ -862,6 +1058,7 @@ pub fn derive_from_reflect(input: TokenStream) -> TokenStream {
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&bevy_reflect_path,
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&active_fields,
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&ignored_fields,
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None,
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),
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DeriveType::TupleStruct => from_reflect::impl_tuple_struct(
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type_name,
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@ -1,44 +1,160 @@
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use crate as bevy_reflect;
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use crate::prelude::ReflectDefault;
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use crate::reflect::Reflect;
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use crate::ReflectDeserialize;
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use bevy_reflect_derive::{impl_from_reflect_value, impl_reflect_value};
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use bevy_reflect_derive::{impl_from_reflect_value, impl_reflect_struct, impl_reflect_value};
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use glam::*;
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impl_reflect_value!(IVec2(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(IVec3(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(IVec4(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(UVec2(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(UVec3(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(UVec4(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(Vec2(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(Vec3(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(Vec3A(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(Vec4(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(DVec2(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(DVec3(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(DVec4(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(Mat3(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(Mat4(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(Quat(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(DMat3(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(DMat4(PartialEq, Serialize, Deserialize));
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impl_reflect_value!(DQuat(PartialEq, Serialize, Deserialize));
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct IVec2 {
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x: i32,
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y: i32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct IVec3 {
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x: i32,
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y: i32,
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z: i32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct IVec4 {
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x: i32,
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y: i32,
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z: i32,
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w: i32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct UVec2 {
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x: u32,
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y: u32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct UVec3 {
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x: u32,
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y: u32,
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z: u32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct UVec4 {
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x: u32,
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y: u32,
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z: u32,
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w: u32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct Vec2 {
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x: f32,
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y: f32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct Vec3 {
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x: f32,
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y: f32,
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z: f32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct Vec3A {
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x: f32,
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y: f32,
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z: f32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct Vec4 {
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x: f32,
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y: f32,
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z: f32,
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w: f32,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct DVec2 {
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x: f64,
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y: f64,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct DVec3 {
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x: f64,
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y: f64,
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z: f64,
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}
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct DVec4 {
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x: f64,
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y: f64,
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z: f64,
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w: f64,
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}
|
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);
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|
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct Mat3 {
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x_axis: Vec3,
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y_axis: Vec3,
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z_axis: Vec3,
|
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}
|
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);
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impl_reflect_struct!(
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
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struct Mat4 {
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x_axis: Vec4,
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y_axis: Vec4,
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z_axis: Vec4,
|
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w_axis: Vec4,
|
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}
|
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);
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|
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impl_reflect_struct!(
|
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
|
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struct DMat3 {
|
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x_axis: DVec3,
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y_axis: DVec3,
|
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z_axis: DVec3,
|
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}
|
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);
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impl_reflect_struct!(
|
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#[reflect(PartialEq, Serialize, Deserialize, Default)]
|
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struct DMat4 {
|
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x_axis: DVec4,
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y_axis: DVec4,
|
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z_axis: DVec4,
|
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w_axis: DVec4,
|
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}
|
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);
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|
||||
// Quat fields are read-only (as of now), and reflection is currently missing
|
||||
// mechanisms for read-only fields. I doubt those mechanisms would be added,
|
||||
// so for now quaternions will remain as values. They are represented identically
|
||||
// to Vec4 and DVec4, so you may use those instead and convert between.
|
||||
impl_reflect_value!(Quat(PartialEq, Serialize, Deserialize, Default));
|
||||
impl_reflect_value!(DQuat(PartialEq, Serialize, Deserialize, Default));
|
||||
|
||||
impl_from_reflect_value!(IVec2);
|
||||
impl_from_reflect_value!(IVec3);
|
||||
impl_from_reflect_value!(IVec4);
|
||||
impl_from_reflect_value!(UVec2);
|
||||
impl_from_reflect_value!(UVec3);
|
||||
impl_from_reflect_value!(UVec4);
|
||||
impl_from_reflect_value!(Vec2);
|
||||
impl_from_reflect_value!(Vec3);
|
||||
impl_from_reflect_value!(Vec4);
|
||||
impl_from_reflect_value!(Vec3A);
|
||||
impl_from_reflect_value!(DVec2);
|
||||
impl_from_reflect_value!(DVec3);
|
||||
impl_from_reflect_value!(DVec4);
|
||||
impl_from_reflect_value!(Mat3);
|
||||
impl_from_reflect_value!(Mat4);
|
||||
impl_from_reflect_value!(Quat);
|
||||
impl_from_reflect_value!(DMat3);
|
||||
impl_from_reflect_value!(DMat4);
|
||||
impl_from_reflect_value!(DQuat);
|
||||
|
|
|
|||
|
|
@ -82,7 +82,10 @@ pub mod __macro_exports {
|
|||
#[cfg(test)]
|
||||
#[allow(clippy::blacklisted_name, clippy::approx_constant)]
|
||||
mod tests {
|
||||
#[cfg(feature = "glam")]
|
||||
use ::glam::{vec3, Vec3};
|
||||
use ::serde::de::DeserializeSeed;
|
||||
use ::serde::Serialize;
|
||||
use bevy_utils::HashMap;
|
||||
use ron::{
|
||||
ser::{to_string_pretty, PrettyConfig},
|
||||
|
|
@ -471,4 +474,92 @@ mod tests {
|
|||
// Should compile:
|
||||
let _ = trait_object.as_reflect();
|
||||
}
|
||||
|
||||
#[cfg(feature = "glam")]
|
||||
mod glam {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn vec3_serialization() {
|
||||
let v = vec3(12.0, 3.0, -6.9);
|
||||
|
||||
let mut registry = TypeRegistry::default();
|
||||
registry.add_registration(Vec3::get_type_registration());
|
||||
|
||||
let ser = ReflectSerializer::new(&v, ®istry);
|
||||
|
||||
let mut dest = vec![];
|
||||
let mut serializer = ron::ser::Serializer::new(&mut dest, None, false)
|
||||
.expect("Failed to acquire serializer");
|
||||
|
||||
ser.serialize(&mut serializer).expect("Failed to serialize");
|
||||
|
||||
let result = String::from_utf8(dest).expect("Failed to convert to string");
|
||||
|
||||
assert_eq!(
|
||||
result,
|
||||
r#"{"type":"glam::vec3::Vec3","struct":{"x":{"type":"f32","value":12},"y":{"type":"f32","value":3},"z":{"type":"f32","value":-6.9}}}"#
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn vec3_deserialization() {
|
||||
let data = r#"{"type":"glam::vec3::Vec3","struct":{"x":{"type":"f32","value":12},"y":{"type":"f32","value":3},"z":{"type":"f32","value":-6.9}}}"#;
|
||||
|
||||
let mut registry = TypeRegistry::default();
|
||||
registry.add_registration(Vec3::get_type_registration());
|
||||
registry.add_registration(f32::get_type_registration());
|
||||
|
||||
let de = ReflectDeserializer::new(®istry);
|
||||
|
||||
let mut deserializer =
|
||||
ron::de::Deserializer::from_str(data).expect("Failed to acquire deserializer");
|
||||
|
||||
let dynamic_struct = de
|
||||
.deserialize(&mut deserializer)
|
||||
.expect("Failed to deserialize");
|
||||
|
||||
let mut result = Vec3::default();
|
||||
|
||||
result.apply(&*dynamic_struct);
|
||||
|
||||
assert_eq!(result, vec3(12.0, 3.0, -6.9));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn vec3_field_access() {
|
||||
let mut v = vec3(1.0, 2.0, 3.0);
|
||||
|
||||
assert_eq!(*v.get_field::<f32>("x").unwrap(), 1.0);
|
||||
|
||||
*v.get_field_mut::<f32>("y").unwrap() = 6.0;
|
||||
|
||||
assert_eq!(v.y, 6.0);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn vec3_path_access() {
|
||||
let mut v = vec3(1.0, 2.0, 3.0);
|
||||
|
||||
assert_eq!(*v.path("x").unwrap().downcast_ref::<f32>().unwrap(), 1.0);
|
||||
|
||||
*v.path_mut("y").unwrap().downcast_mut::<f32>().unwrap() = 6.0;
|
||||
|
||||
assert_eq!(v.y, 6.0);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn vec3_apply_dynamic() {
|
||||
let mut v = vec3(3.0, 3.0, 3.0);
|
||||
|
||||
let mut d = DynamicStruct::default();
|
||||
d.insert("x", 4.0f32);
|
||||
d.insert("y", 2.0f32);
|
||||
d.insert("z", 1.0f32);
|
||||
|
||||
v.apply(&d);
|
||||
|
||||
assert_eq!(v, vec3(4.0, 2.0, 1.0));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue