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Ensure ExtendedMaterial works with reflection (to enable bevy_egui_inspector integration) (#10548)

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# Objective

- Ensure ExtendedMaterial can be referenced in bevy_egui_inspector
correctly

## Solution

Add a more manual `TypePath` implementation to work around bugs in the
derive macro.
This commit is contained in:
BrayMatter 2023-11-15 06:48:36 -06:00 committed by GitHub
parent 782f1863b9
commit bad55c1ad8
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2 changed files with 8 additions and 4 deletions
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9
crates/bevy_pbr/src/extended_material.rs
View file

@ -1,5 +1,5 @@
use bevy_asset::{Asset, Handle};
use bevy_reflect::TypePath;
use bevy_reflect::{impl_type_path, Reflect};
use bevy_render::{
mesh::MeshVertexBufferLayout,
render_asset::RenderAssets,
@ -97,12 +97,17 @@ pub trait MaterialExtension: Asset + AsBindGroup + Clone + Sized {
/// When used with `StandardMaterial` as the base, all the standard material fields are
/// present, so the `pbr_fragment` shader functions can be called from the extension shader (see
/// the `extended_material` example).
#[derive(Asset, Clone, TypePath)]
#[derive(Asset, Clone, Reflect)]
#[reflect(type_path = false)]
pub struct ExtendedMaterial<B: Material, E: MaterialExtension> {
pub base: B,
pub extension: E,
}
// We don't use the `TypePath` derive here due to a bug where `#[reflect(type_path = false)]`
// causes the `TypePath` derive to not generate an implementation.
impl_type_path!((in bevy_pbr::extended_material) ExtendedMaterial<B: Material, E: MaterialExtension>);
impl<B: Material, E: MaterialExtension> AsBindGroup for ExtendedMaterial<B, E> {
type Data = (<B as AsBindGroup>::Data, <E as AsBindGroup>::Data);

3
examples/shader/extended_material.rs
View file

@ -1,6 +1,5 @@
//! Demonstrates using a custom extension to the `StandardMaterial` to modify the results of the builtin pbr shader.
use bevy::reflect::TypePath;
use bevy::{
pbr::{ExtendedMaterial, MaterialExtension, OpaqueRendererMethod},
prelude::*,
@ -73,7 +72,7 @@ fn rotate_things(mut q: Query<&mut Transform, With<Rotate>>, time: Res<Time>) {
}
}
#[derive(Asset, AsBindGroup, TypePath, Debug, Clone)]
#[derive(Asset, AsBindGroup, Reflect, Debug, Clone)]
struct MyExtension {
// We need to ensure that the bindings of the base material and the extension do not conflict,
// so we start from binding slot 100, leaving slots 0-99 for the base material.