From c0e39721a2dd4030015e7c0bee949dc95878f7ce Mon Sep 17 00:00:00 2001
From: teoxoy <28601907+teoxoy@users.noreply.github.com>
Date: Fri, 11 Oct 2024 18:52:49 +0200
Subject: [PATCH] remove `Hub.clear()`

---
 wgpu-core/src/global.rs | 11 +++++-----
 wgpu-core/src/hub.rs    | 46 ++---------------------------------------
 2 files changed, 7 insertions(+), 50 deletions(-)

diff --git a/wgpu-core/src/global.rs b/wgpu-core/src/global.rs
index fdb77a375..25a864ec2 100644
--- a/wgpu-core/src/global.rs
+++ b/wgpu-core/src/global.rs
@@ -24,9 +24,10 @@ impl GlobalReport {
 }
 
 pub struct Global {
-    pub instance: Instance,
     pub(crate) surfaces: Registry<Arc<Surface>>,
     pub(crate) hub: Hub,
+    // the instance must be dropped last
+    pub instance: Instance,
 }
 
 impl Global {
@@ -88,12 +89,10 @@ impl Drop for Global {
     fn drop(&mut self) {
         profiling::scope!("Global::drop");
         resource_log!("Global::drop");
-        let mut surfaces_locked = self.surfaces.write();
 
-        // destroy hub before the instance gets dropped
-        self.hub.clear(&surfaces_locked);
-
-        surfaces_locked.map.clear();
+        for (_, device) in self.hub.devices.read().iter() {
+            device.prepare_to_die();
+        }
     }
 }
 
diff --git a/wgpu-core/src/hub.rs b/wgpu-core/src/hub.rs
index f4e8b9c75..ae6cbbb87 100644
--- a/wgpu-core/src/hub.rs
+++ b/wgpu-core/src/hub.rs
@@ -104,11 +104,10 @@ use crate::{
     binding_model::{BindGroup, BindGroupLayout, PipelineLayout},
     command::{CommandBuffer, RenderBundle},
     device::{queue::Queue, Device},
-    instance::{Adapter, Surface},
+    instance::Adapter,
     pipeline::{ComputePipeline, PipelineCache, RenderPipeline, ShaderModule},
     registry::{Registry, RegistryReport},
     resource::{Buffer, Fallible, QuerySet, Sampler, StagingBuffer, Texture, TextureView},
-    storage::{Element, Storage},
 };
 use std::{fmt::Debug, sync::Arc};
 
@@ -159,8 +158,7 @@ impl HubReport {
 /// Inside the `Registry` there are `Arc<T>` where `T` is a Resource
 /// Lock of `Registry` happens only when accessing to get the specific resource
 ///
-///
-/// [`A::hub(global)`]: HalApi::hub
+/// [`Storage`]: crate::storage::Storage
 pub struct Hub {
     pub(crate) adapters: Registry<Arc<Adapter>>,
     pub(crate) devices: Registry<Arc<Device>>,
@@ -206,46 +204,6 @@ impl Hub {
         }
     }
 
-    pub(crate) fn clear(&self, surface_guard: &Storage<Arc<Surface>>) {
-        let mut devices = self.devices.write();
-        for element in devices.map.iter() {
-            if let Element::Occupied(ref device, _) = *element {
-                device.prepare_to_die();
-            }
-        }
-
-        self.command_buffers.write().map.clear();
-        self.samplers.write().map.clear();
-        self.texture_views.write().map.clear();
-        self.textures.write().map.clear();
-        self.buffers.write().map.clear();
-        self.bind_groups.write().map.clear();
-        self.shader_modules.write().map.clear();
-        self.bind_group_layouts.write().map.clear();
-        self.pipeline_layouts.write().map.clear();
-        self.compute_pipelines.write().map.clear();
-        self.render_pipelines.write().map.clear();
-        self.pipeline_caches.write().map.clear();
-        self.query_sets.write().map.clear();
-
-        for element in surface_guard.map.iter() {
-            if let Element::Occupied(ref surface, _epoch) = *element {
-                if let Some(ref mut present) = surface.presentation.lock().take() {
-                    let suf = surface.raw(present.device.backend());
-                    unsafe {
-                        suf.unwrap().unconfigure(present.device.raw());
-                    }
-                }
-            }
-        }
-
-        self.queues.write().map.clear();
-        devices.map.clear();
-
-        drop(devices);
-        self.adapters.write().map.clear();
-    }
-
     pub fn generate_report(&self) -> HubReport {
         HubReport {
             adapters: self.adapters.generate_report(),