Reuse sampler when creating cached bind groups (#10610)

# Objective

- Some passes recreate a sampler when creating a bind group to be
cached, even if the sampler is always the same.

## Solution

- Store the sampler in the corresponding pipeline resource.

crates/bevy_core_pipeline/src/fxaa/mod.rs

@@ -5,7 +5,6 @@ use crate::{
 };
 use bevy_app::prelude::*;
 use bevy_asset::{load_internal_asset, Handle};
-use bevy_derive::Deref;
 use bevy_ecs::prelude::*;
 use bevy_reflect::{std_traits::ReflectDefault, Reflect};
 use bevy_render::{
@@ -22,6 +21,7 @@ use bevy_render::{
     view::{ExtractedView, ViewTarget},
     Render, RenderApp, RenderSet,
 };
+use bevy_utils::default;
 
 mod node;
 
@@ -123,16 +123,16 @@ impl Plugin for FxaaPlugin {
     }
 }
 
-#[derive(Resource, Deref)]
+#[derive(Resource)]
 pub struct FxaaPipeline {
     texture_bind_group: BindGroupLayout,
+    sampler: Sampler,
 }
 
 impl FromWorld for FxaaPipeline {
     fn from_world(render_world: &mut World) -> Self {
-        let texture_bind_group = render_world
-            .resource::<RenderDevice>()
-            .create_bind_group_layout(
+        let render_device = render_world.resource::<RenderDevice>();
+        let texture_bind_group = render_device.create_bind_group_layout(
             "fxaa_texture_bind_group_layout",
             &BindGroupLayoutEntries::sequential(
                 ShaderStages::FRAGMENT,
@@ -143,7 +143,17 @@ impl FromWorld for FxaaPipeline {
             ),
         );
 
-        FxaaPipeline { texture_bind_group }
+        let sampler = render_device.create_sampler(&SamplerDescriptor {
+            mipmap_filter: FilterMode::Linear,
+            mag_filter: FilterMode::Linear,
+            min_filter: FilterMode::Linear,
+            ..default()
+        });
+
+        FxaaPipeline {
+            texture_bind_group,
+            sampler,
+        }
     }
 }
 

crates/bevy_core_pipeline/src/fxaa/node.rs

@@ -6,13 +6,12 @@ use bevy_ecs::query::QueryItem;
 use bevy_render::{
     render_graph::{NodeRunError, RenderGraphContext, ViewNode},
     render_resource::{
-        BindGroup, BindGroupEntries, FilterMode, Operations, PipelineCache,
-        RenderPassColorAttachment, RenderPassDescriptor, SamplerDescriptor, TextureViewId,
+        BindGroup, BindGroupEntries, Operations, PipelineCache, RenderPassColorAttachment,
+        RenderPassDescriptor, TextureViewId,
     },
     renderer::RenderContext,
     view::ViewTarget,
 };
-use bevy_utils::default;
 
 #[derive(Default)]
 pub struct FxaaNode {
@@ -51,19 +50,10 @@ impl ViewNode for FxaaNode {
         let bind_group = match &mut *cached_bind_group {
             Some((id, bind_group)) if source.id() == *id => bind_group,
             cached_bind_group => {
-                let sampler = render_context
-                    .render_device()
-                    .create_sampler(&SamplerDescriptor {
-                        mipmap_filter: FilterMode::Linear,
-                        mag_filter: FilterMode::Linear,
-                        min_filter: FilterMode::Linear,
-                        ..default()
-                    });
-
                 let bind_group = render_context.render_device().create_bind_group(
                     None,
                     &fxaa_pipeline.texture_bind_group,
-                    &BindGroupEntries::sequential((source, &sampler)),
+                    &BindGroupEntries::sequential((source, &fxaa_pipeline.sampler)),
                 );
 
                 let (_, bind_group) = cached_bind_group.insert((source.id(), bind_group));

crates/bevy_core_pipeline/src/tonemapping/mod.rs

@@ -114,6 +114,7 @@ impl Plugin for TonemappingPlugin {
 #[derive(Resource)]
 pub struct TonemappingPipeline {
     texture_bind_group: BindGroupLayout,
+    sampler: Sampler,
 }
 
 /// Optionally enables a tonemapping shader that attempts to map linear input stimulus into a perceptually uniform image for a given [`Camera`] entity.
@@ -266,12 +267,15 @@ impl FromWorld for TonemappingPipeline {
         entries =
             entries.extend_with_indices(((3, lut_layout_entries[0]), (4, lut_layout_entries[1])));
 
-        let tonemap_texture_bind_group = render_world
-            .resource::<RenderDevice>()
+        let render_device = render_world.resource::<RenderDevice>();
+        let tonemap_texture_bind_group = render_device
             .create_bind_group_layout("tonemapping_hdr_texture_bind_group_layout", &entries);
 
+        let sampler = render_device.create_sampler(&SamplerDescriptor::default());
+
         TonemappingPipeline {
             texture_bind_group: tonemap_texture_bind_group,
+            sampler,
         }
     }
 }

crates/bevy_core_pipeline/src/tonemapping/node.rs

@@ -8,7 +8,7 @@ use bevy_render::{
     render_graph::{NodeRunError, RenderGraphContext, ViewNode},
     render_resource::{
         BindGroup, BindGroupEntries, BufferId, LoadOp, Operations, PipelineCache,
-        RenderPassColorAttachment, RenderPassDescriptor, SamplerDescriptor, StoreOp, TextureViewId,
+        RenderPassColorAttachment, RenderPassDescriptor, StoreOp, TextureViewId,
     },
     renderer::RenderContext,
     texture::Image,
@@ -80,10 +80,6 @@ impl ViewNode for TonemappingNode {
                 bind_group
             }
             cached_bind_group => {
-                let sampler = render_context
-                    .render_device()
-                    .create_sampler(&SamplerDescriptor::default());
-
                 let tonemapping_luts = world.resource::<TonemappingLuts>();
 
                 let lut_bindings = get_lut_bindings(gpu_images, tonemapping_luts, tonemapping);
@@ -94,7 +90,7 @@ impl ViewNode for TonemappingNode {
                     &BindGroupEntries::sequential((
                         view_uniforms,
                         source,
-                        &sampler,
+                        &tonemapping_pipeline.sampler,
                         lut_bindings.0,
                         lut_bindings.1,
                     )),

crates/bevy_core_pipeline/src/upscaling/node.rs

@@ -5,7 +5,7 @@ use bevy_render::{
     render_graph::{NodeRunError, RenderGraphContext, ViewNode},
     render_resource::{
         BindGroup, BindGroupEntries, LoadOp, Operations, PipelineCache, RenderPassColorAttachment,
-        RenderPassDescriptor, SamplerDescriptor, StoreOp, TextureViewId,
+        RenderPassDescriptor, StoreOp, TextureViewId,
     },
     renderer::RenderContext,
     view::ViewTarget,
@@ -52,14 +52,10 @@ impl ViewNode for UpscalingNode {
         let bind_group = match &mut *cached_bind_group {
             Some((id, bind_group)) if upscaled_texture.id() == *id => bind_group,
             cached_bind_group => {
-                let sampler = render_context
-                    .render_device()
-                    .create_sampler(&SamplerDescriptor::default());
-
                 let bind_group = render_context.render_device().create_bind_group(
                     None,
                     &blit_pipeline.texture_bind_group,
-                    &BindGroupEntries::sequential((upscaled_texture, &sampler)),
+                    &BindGroupEntries::sequential((upscaled_texture, &blit_pipeline.sampler)),
                 );
 
                 let (_, bind_group) = cached_bind_group.insert((upscaled_texture.id(), bind_group));