Move specialize_* to QueueMeshes. (bevyengine#17719)

# Objective

Things were breaking post-cs.

## Solution

`specialize_mesh_materials` must run after
`collect_meshes_for_gpu_building`. Therefore, its placement in the
`PrepareAssets` set didn't make sense (also more generally). To fix, we
put this class of system in ~`PrepareResources`~ `QueueMeshes`, although
it potentially could use a more descriptive location. We may want to
review the placement of `check_views_need_specialization` which is also
currently in `PrepareAssets`.

Author: tychedelia

crates/bevy_pbr/src/material.rs

@@ -314,9 +314,10 @@ where
                     Render,
                     (
                         specialize_material_meshes::<M>
-                            .in_set(RenderSet::PrepareAssets)
+                            .in_set(RenderSet::PrepareMeshes)
                             .after(prepare_assets::<PreparedMaterial<M>>)
-                            .after(prepare_assets::<RenderMesh>),
+                            .after(prepare_assets::<RenderMesh>)
+                            .after(collect_meshes_for_gpu_building),
                         queue_material_meshes::<M>
                             .in_set(RenderSet::QueueMeshes)
                             .after(prepare_assets::<PreparedMaterial<M>>),
@@ -339,7 +340,7 @@ where
                         (
                             check_views_lights_need_specialization.in_set(RenderSet::PrepareAssets),
                             specialize_shadows::<M>
-                                .in_set(RenderSet::PrepareAssets)
+                                .in_set(RenderSet::PrepareMeshes)
                                 .after(prepare_assets::<PreparedMaterial<M>>),
                             queue_shadows::<M>
                                 .in_set(RenderSet::QueueMeshes)

crates/bevy_pbr/src/prepass/mod.rs

@@ -2,12 +2,12 @@ mod prepass_bindings;
 
 use crate::{
     alpha_mode_pipeline_key, binding_arrays_are_usable, buffer_layout,
-    material_bind_groups::MaterialBindGroupAllocator, queue_material_meshes,
-    setup_morph_and_skinning_defs, skin, DrawMesh, EntitySpecializationTicks, Material,
-    MaterialPipeline, MaterialPipelineKey, MeshLayouts, MeshPipeline, MeshPipelineKey,
-    OpaqueRendererMethod, PreparedMaterial, RenderLightmaps, RenderMaterialInstances,
-    RenderMeshInstanceFlags, RenderMeshInstances, RenderPhaseType, SetMaterialBindGroup,
-    SetMeshBindGroup, ShadowView, StandardMaterial,
+    collect_meshes_for_gpu_building, material_bind_groups::MaterialBindGroupAllocator,
+    queue_material_meshes, setup_morph_and_skinning_defs, skin, DrawMesh,
+    EntitySpecializationTicks, Material, MaterialPipeline, MaterialPipelineKey, MeshLayouts,
+    MeshPipeline, MeshPipelineKey, OpaqueRendererMethod, PreparedMaterial, RenderLightmaps,
+    RenderMaterialInstances, RenderMeshInstanceFlags, RenderMeshInstances, RenderPhaseType,
+    SetMaterialBindGroup, SetMeshBindGroup, ShadowView, StandardMaterial,
 };
 use bevy_app::{App, Plugin, PreUpdate};
 use bevy_render::{
@@ -61,7 +61,7 @@ use bevy_ecs::system::SystemChangeTick;
 use bevy_platform_support::collections::HashMap;
 use bevy_render::sync_world::{MainEntity, MainEntityHashMap};
 use bevy_render::view::RenderVisibleEntities;
-use bevy_render::RenderSet::PrepareAssets;
+use bevy_render::RenderSet::{PrepareAssets, PrepareResources};
 use core::{hash::Hash, marker::PhantomData};
 
 pub const PREPASS_SHADER_HANDLE: Handle<Shader> =
@@ -190,7 +190,7 @@ where
                 .add_systems(ExtractSchedule, extract_camera_previous_view_data)
                 .add_systems(
                     Render,
-                    prepare_previous_view_uniforms.in_set(RenderSet::PrepareResources),
+                    prepare_previous_view_uniforms.in_set(PrepareResources),
                 );
         }
 
@@ -207,9 +207,10 @@ where
                 (
                     check_prepass_views_need_specialization.in_set(PrepareAssets),
                     specialize_prepass_material_meshes::<M>
-                        .in_set(PrepareAssets)
+                        .in_set(RenderSet::PrepareMeshes)
                         .after(prepare_assets::<PreparedMaterial<M>>)
-                        .after(prepare_assets::<RenderMesh>),
+                        .after(prepare_assets::<RenderMesh>)
+                        .after(collect_meshes_for_gpu_building),
                     queue_prepass_material_meshes::<M>
                         .in_set(RenderSet::QueueMeshes)
                         .after(prepare_assets::<PreparedMaterial<M>>)

crates/bevy_sprite/src/mesh2d/material.rs

@@ -287,7 +287,7 @@ where
                     Render,
                     (
                         specialize_material2d_meshes::<M>
-                            .in_set(RenderSet::PrepareAssets)
+                            .in_set(RenderSet::PrepareMeshes)
                             .after(prepare_assets::<PreparedMaterial2d<M>>)
                             .after(prepare_assets::<RenderMesh>),
                         queue_material2d_meshes::<M>