Fix shader import errors in deferred, solari and meshlet

_release-content/migration-guides/shader_octahedral_moved.md

@@ -0,0 +1,14 @@
+---
+title: "Shader `bevy_pbr::utils::{octahedral_encode, octahedral_decode, octahedral_decode_signed}` are moved"
+pull_requests: [21926]
+---
+
+Shader functions `bevy_pbr::utils::{octahedral_encode, octahedral_decode, octahedral_decode_signed}` are moved to `bevy_render::utils::{octahedral_encode, octahedral_decode, octahedral_decode_signed}`
+
+```wgsl
+// BEFORE
+#import bevy_pbr::utils::{octahedral_encode, octahedral_decode, octahedral_decode_signed}
+
+// AFTER
+#import bevy_render::utils::{octahedral_encode, octahedral_decode, octahedral_decode_signed}
+```

crates/bevy_pbr/src/deferred/pbr_deferred_functions.wgsl

@@ -6,10 +6,10 @@
     pbr_functions,
     rgb9e5,
     mesh_view_bindings::view,
-    utils::{octahedral_encode, octahedral_decode},
     prepass_io::FragmentOutput,
     view_transformations::{position_ndc_to_world, frag_coord_to_ndc},
 }
+#import bevy_render::utils::{octahedral_encode, octahedral_decode}
 
 #ifdef MESHLET_MESH_MATERIAL_PASS
 #import bevy_pbr::meshlet_visibility_buffer_resolve::VertexOutput

crates/bevy_pbr/src/render/forward_io.wgsl

@@ -78,6 +78,8 @@ struct Vertex {
 #endif
 };
 
+#ifndef MESHLET_MESH_MATERIAL_PASS
+
 // The instance_index parameter must match vertex_in.instance_index. This is a work around for a wgpu dx12 bug.
 // See https://github.com/gfx-rs/naga/issues/2416
 fn decompress_vertex(vertex_in: Vertex, instance_index: u32) -> UncompressedVertex {
@@ -134,6 +136,8 @@ fn decompress_vertex(vertex_in: Vertex, instance_index: u32) -> UncompressedVert
     return uncompressed_vertex;
 }
 
+#endif
+
 struct VertexOutput {
     // This is `clip position` when the struct is used as a vertex stage output
     // and `frag coord` when used as a fragment stage input

crates/bevy_solari/src/realtime/presample_light_tiles.wgsl

@@ -5,7 +5,7 @@ enable wgpu_ray_query;
 #define_import_path bevy_solari::presample_light_tiles
 
 #import bevy_pbr::rgb9e5::{vec3_to_rgb9e5_, rgb9e5_to_vec3_}
-#import bevy_pbr::utils::{octahedral_encode, octahedral_decode}
+#import bevy_render::utils::{octahedral_encode, octahedral_decode}
 #import bevy_render::view::View
 #import bevy_solari::sampling::{generate_random_light_sample, LightSample, ResolvedLightSample}
 #import bevy_solari::realtime_bindings::{light_tile_samples, light_tile_resolved_samples, view, constants, ResolvedLightSamplePacked}