bevy_pbr: Apply #![deny(clippy::allow_attributes, clippy::allow_attributes_without_reason)] (#17277)

# Objective
- https://github.com/bevyengine/bevy/issues/17111

## Solution
Set the `clippy::allow_attributes` and
`clippy::allow_attributes_without_reason` lints to `deny`, and bring
`bevy_pbr` in line with the new restrictions.

## Testing
`cargo clippy --tests --package bevy_pbr` was run, and no errors were
encountered.

crates/bevy_pbr/src/extended_material.rs

@@ -37,7 +37,6 @@ pub trait MaterialExtension: Asset + AsBindGroup + Clone + Sized {
 
     /// Returns this material's fragment shader. If [`ShaderRef::Default`] is returned, the base material mesh fragment shader
     /// will be used.
-    #[allow(unused_variables)]
     fn fragment_shader() -> ShaderRef {
         ShaderRef::Default
     }
@@ -50,7 +49,6 @@ pub trait MaterialExtension: Asset + AsBindGroup + Clone + Sized {
 
     /// Returns this material's prepass fragment shader. If [`ShaderRef::Default`] is returned, the base material prepass fragment shader
     /// will be used.
-    #[allow(unused_variables)]
     fn prepass_fragment_shader() -> ShaderRef {
         ShaderRef::Default
     }
@@ -63,14 +61,12 @@ pub trait MaterialExtension: Asset + AsBindGroup + Clone + Sized {
 
     /// Returns this material's prepass fragment shader. If [`ShaderRef::Default`] is returned, the base material deferred fragment shader
     /// will be used.
-    #[allow(unused_variables)]
     fn deferred_fragment_shader() -> ShaderRef {
         ShaderRef::Default
     }
 
     /// Returns this material's [`crate::meshlet::MeshletMesh`] fragment shader. If [`ShaderRef::Default`] is returned,
     /// the default meshlet mesh fragment shader will be used.
-    #[allow(unused_variables)]
     #[cfg(feature = "meshlet")]
     fn meshlet_mesh_fragment_shader() -> ShaderRef {
         ShaderRef::Default
@@ -78,7 +74,6 @@ pub trait MaterialExtension: Asset + AsBindGroup + Clone + Sized {
 
     /// Returns this material's [`crate::meshlet::MeshletMesh`] prepass fragment shader. If [`ShaderRef::Default`] is returned,
     /// the default meshlet mesh prepass fragment shader will be used.
-    #[allow(unused_variables)]
     #[cfg(feature = "meshlet")]
     fn meshlet_mesh_prepass_fragment_shader() -> ShaderRef {
         ShaderRef::Default
@@ -86,7 +81,6 @@ pub trait MaterialExtension: Asset + AsBindGroup + Clone + Sized {
 
     /// Returns this material's [`crate::meshlet::MeshletMesh`] deferred fragment shader. If [`ShaderRef::Default`] is returned,
     /// the default meshlet mesh deferred fragment shader will be used.
-    #[allow(unused_variables)]
     #[cfg(feature = "meshlet")]
     fn meshlet_mesh_deferred_fragment_shader() -> ShaderRef {
         ShaderRef::Default
@@ -95,7 +89,10 @@ pub trait MaterialExtension: Asset + AsBindGroup + Clone + Sized {
     /// Customizes the default [`RenderPipelineDescriptor`] for a specific entity using the entity's
     /// [`MaterialPipelineKey`] and [`MeshVertexBufferLayoutRef`] as input.
     /// Specialization for the base material is applied before this function is called.
-    #[allow(unused_variables)]
+    #[expect(
+        unused_variables,
+        reason = "The parameters here are intentionally unused by the default implementation; however, putting underscores here will result in the underscores being copied by rust-analyzer's tab completion."
+    )]
     #[inline]
     fn specialize(
         pipeline: &MaterialExtensionPipeline,

crates/bevy_pbr/src/lib.rs

@@ -1,6 +1,11 @@
 #![expect(missing_docs, reason = "Not all docs are written yet, see #3492.")]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
-#![deny(unsafe_code)]
+#![forbid(unsafe_code)]
+#![deny(
+    clippy::allow_attributes,
+    clippy::allow_attributes_without_reason,
+    reason = "See #17111; To be removed once all crates are in-line with these attributes"
+)]
 #![doc(
     html_logo_url = "https://bevyengine.org/assets/icon.png",
     html_favicon_url = "https://bevyengine.org/assets/icon.png"

crates/bevy_pbr/src/light_probe/mod.rs

@@ -185,7 +185,6 @@ pub struct ViewLightProbesUniformOffset(u32);
 /// This information is parameterized by the [`LightProbeComponent`] type. This
 /// will either be [`EnvironmentMapLight`] for reflection probes or
 /// [`IrradianceVolume`] for irradiance volumes.
-#[allow(dead_code)]
 struct LightProbeInfo<C>
 where
     C: LightProbeComponent,

crates/bevy_pbr/src/material.rs

@@ -124,7 +124,6 @@ pub trait Material: Asset + AsBindGroup + Clone + Sized {
 
     /// Returns this material's fragment shader. If [`ShaderRef::Default`] is returned, the default mesh fragment shader
     /// will be used.
-    #[allow(unused_variables)]
     fn fragment_shader() -> ShaderRef {
         ShaderRef::Default
     }
@@ -174,7 +173,6 @@ pub trait Material: Asset + AsBindGroup + Clone + Sized {
     ///
     /// This is used for the various [prepasses](bevy_core_pipeline::prepass) as well as for generating the depth maps
     /// required for shadow mapping.
-    #[allow(unused_variables)]
     fn prepass_fragment_shader() -> ShaderRef {
         ShaderRef::Default
     }
@@ -187,7 +185,6 @@ pub trait Material: Asset + AsBindGroup + Clone + Sized {
 
     /// Returns this material's deferred fragment shader. If [`ShaderRef::Default`] is returned, the default deferred fragment shader
     /// will be used.
-    #[allow(unused_variables)]
     fn deferred_fragment_shader() -> ShaderRef {
         ShaderRef::Default
     }
@@ -198,7 +195,6 @@ pub trait Material: Asset + AsBindGroup + Clone + Sized {
     /// This is part of an experimental feature, and is unnecessary to implement unless you are using `MeshletMesh`'s.
     ///
     /// See [`crate::meshlet::MeshletMesh`] for limitations.
-    #[allow(unused_variables)]
     #[cfg(feature = "meshlet")]
     fn meshlet_mesh_fragment_shader() -> ShaderRef {
         ShaderRef::Default
@@ -210,7 +206,6 @@ pub trait Material: Asset + AsBindGroup + Clone + Sized {
     /// This is part of an experimental feature, and is unnecessary to implement unless you are using `MeshletMesh`'s.
     ///
     /// See [`crate::meshlet::MeshletMesh`] for limitations.
-    #[allow(unused_variables)]
     #[cfg(feature = "meshlet")]
     fn meshlet_mesh_prepass_fragment_shader() -> ShaderRef {
         ShaderRef::Default
@@ -222,7 +217,6 @@ pub trait Material: Asset + AsBindGroup + Clone + Sized {
     /// This is part of an experimental feature, and is unnecessary to implement unless you are using `MeshletMesh`'s.
     ///
     /// See [`crate::meshlet::MeshletMesh`] for limitations.
-    #[allow(unused_variables)]
     #[cfg(feature = "meshlet")]
     fn meshlet_mesh_deferred_fragment_shader() -> ShaderRef {
         ShaderRef::Default
@@ -230,7 +224,10 @@ pub trait Material: Asset + AsBindGroup + Clone + Sized {
 
     /// Customizes the default [`RenderPipelineDescriptor`] for a specific entity using the entity's
     /// [`MaterialPipelineKey`] and [`MeshVertexBufferLayoutRef`] as input.
-    #[allow(unused_variables)]
+    #[expect(
+        unused_variables,
+        reason = "The parameters here are intentionally unused by the default implementation; however, putting underscores here will result in the underscores being copied by rust-analyzer's tab completion."
+    )]
     #[inline]
     fn specialize(
         pipeline: &MaterialPipeline<Self>,

crates/bevy_pbr/src/ssao/mod.rs

@@ -752,17 +752,9 @@ fn prepare_ssao_bind_groups(
     }
 }
 
-#[allow(clippy::needless_range_loop)]
 fn generate_hilbert_index_lut() -> [[u16; 64]; 64] {
-    let mut t = [[0; 64]; 64];
-
-    for x in 0..64 {
-        for y in 0..64 {
-            t[x][y] = hilbert_index(x as u16, y as u16);
-        }
-    }
-
-    t
+    use core::array::from_fn;
+    from_fn(|x| from_fn(|y| hilbert_index(x as u16, y as u16)))
 }
 
 // https://www.shadertoy.com/view/3tB3z3