Avoid cloning Arcs unnecessarily when iterating trackers (#6721)

* Avoid cloning Arcs unnecessarily when iterating trackers

* Changelog entry

CHANGELOG.md

@@ -166,6 +166,7 @@ By @ErichDonGubler in [#6456](https://github.com/gfx-rs/wgpu/pull/6456), [#6148]
   - Check that at least one index is specified.
 - Reject destroyed buffers in query set resolution. By @ErichDonGubler in [#6579](https://github.com/gfx-rs/wgpu/pull/6579).
 - Fix panic when dropping `Device` on some environments. By @Dinnerbone in [#6681](https://github.com/gfx-rs/wgpu/pull/6681).
+- Reduced the overhead of command buffer validation. By @nical in [#6721](https://github.com/gfx-rs/wgpu/pull/6721).
 
 #### Naga
 

wgpu-core/src/device/queue.rs

@@ -1568,16 +1568,15 @@ fn validate_command_buffer(
                     TextureInner::Native { .. } => false,
                     TextureInner::Surface { .. } => {
                         // Compare the Arcs by pointer as Textures don't implement Eq.
-                        submit_surface_textures_owned
-                            .insert(Arc::as_ptr(&texture), texture.clone());
+                        submit_surface_textures_owned.insert(Arc::as_ptr(texture), texture.clone());
 
                         true
                     }
                 };
                 if should_extend {
                     unsafe {
                         used_surface_textures
-                            .merge_single(&texture, None, hal::TextureUses::PRESENT)
+                            .merge_single(texture, None, hal::TextureUses::PRESENT)
                             .unwrap();
                     };
                 }

wgpu-core/src/device/resource.rs

@@ -3637,12 +3637,12 @@ impl Device {
         // During these iterations, we discard all errors. We don't care!
         let trackers = self.trackers.lock();
         for buffer in trackers.buffers.used_resources() {
-            if let Some(buffer) = Weak::upgrade(&buffer) {
+            if let Some(buffer) = Weak::upgrade(buffer) {
                 let _ = buffer.destroy();
             }
         }
         for texture in trackers.textures.used_resources() {
-            if let Some(texture) = Weak::upgrade(&texture) {
+            if let Some(texture) = Weak::upgrade(texture) {
                 let _ = texture.destroy();
             }
         }

wgpu-core/src/track/buffer.rs

@@ -311,7 +311,7 @@ impl BufferTracker {
     }
 
     /// Returns a list of all buffers tracked.
-    pub fn used_resources(&self) -> impl Iterator<Item = Arc<Buffer>> + '_ {
+    pub fn used_resources(&self) -> impl Iterator<Item = &Arc<Buffer>> + '_ {
         self.metadata.owned_resources()
     }
 
@@ -559,7 +559,7 @@ impl DeviceBufferTracker {
     }
 
     /// Returns a list of all buffers tracked.
-    pub fn used_resources(&self) -> impl Iterator<Item = Weak<Buffer>> + '_ {
+    pub fn used_resources(&self) -> impl Iterator<Item = &Weak<Buffer>> + '_ {
         self.metadata.owned_resources()
     }
 

wgpu-core/src/track/metadata.rs

@@ -111,13 +111,13 @@ impl<T: Clone> ResourceMetadata<T> {
     }
 
     /// Returns an iterator over the resources owned by `self`.
-    pub(super) fn owned_resources(&self) -> impl Iterator<Item = T> + '_ {
+    pub(super) fn owned_resources(&self) -> impl Iterator<Item = &T> + '_ {
         if !self.owned.is_empty() {
             self.tracker_assert_in_bounds(self.owned.len() - 1)
         };
         iterate_bitvec_indices(&self.owned).map(move |index| {
             let resource = unsafe { self.resources.get_unchecked(index) };
-            resource.as_ref().unwrap().clone()
+            resource.as_ref().unwrap()
         })
     }
 

wgpu-core/src/track/texture.rs

@@ -429,10 +429,9 @@ impl TextureTracker {
     }
 
     /// Returns a list of all textures tracked.
-    pub fn used_resources(&self) -> impl Iterator<Item = Arc<Texture>> + '_ {
+    pub fn used_resources(&self) -> impl Iterator<Item = &Arc<Texture>> + '_ {
         self.metadata.owned_resources()
     }
-
     /// Drain all currently pending transitions.
     pub fn drain_transitions<'a>(
         &'a mut self,
@@ -672,7 +671,7 @@ impl DeviceTextureTracker {
     }
 
     /// Returns a list of all textures tracked.
-    pub fn used_resources(&self) -> impl Iterator<Item = Weak<Texture>> + '_ {
+    pub fn used_resources(&self) -> impl Iterator<Item = &Weak<Texture>> + '_ {
         self.metadata.owned_resources()
     }