Auto merge of #24883 - szeged:id_management, r=jdm

Add WebGPU identity management

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes addresses a part of #24706

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
cc @jdm, @kvark, @zakorgy
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

6 files changed, 72 insertions, 13 deletions

diff --git a/components/script/dom/bindings/trace.rs b/components/script/dom/bindings/trace.rs
index 5f10ad44446..65717bb81bf 100644
--- a/components/script/dom/bindings/trace.rs
+++ b/components/script/dom/bindings/trace.rs
@@ -39,6 +39,7 @@ use crate::dom::bindings::utils::WindowProxyHandler;
 use crate::dom::document::PendingRestyle;
 use crate::dom::htmlimageelement::SourceSet;
 use crate::dom::htmlmediaelement::{HTMLMediaElementFetchContext, MediaFrameRenderer};
+use crate::dom::identityhub::Identities;
 use crate::task::TaskBox;
 use app_units::Au;
 use canvas_traits::canvas::{
@@ -504,6 +505,7 @@ unsafe_no_jsmanaged_fields!(WebGLVertexArrayId);
 unsafe_no_jsmanaged_fields!(WebGLVersion);
 unsafe_no_jsmanaged_fields!(WebGLSLVersion);
 unsafe_no_jsmanaged_fields!(WebGPU);
+unsafe_no_jsmanaged_fields!(RefCell<Identities>);
 unsafe_no_jsmanaged_fields!(WebGPUAdapter);
 unsafe_no_jsmanaged_fields!(WebXRSwapChainId);
 unsafe_no_jsmanaged_fields!(MediaList);
diff --git a/components/script/dom/gpu.rs b/components/script/dom/gpu.rs
index cbde108bc01..4e47620052e 100644
--- a/components/script/dom/gpu.rs
+++ b/components/script/dom/gpu.rs
@@ -5,6 +5,7 @@
 use crate::compartments::InCompartment;
 use crate::dom::bindings::codegen::Bindings::GPUBinding::GPURequestAdapterOptions;
 use crate::dom::bindings::codegen::Bindings::GPUBinding::{self, GPUMethods, GPUPowerPreference};
+use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowBinding::WindowMethods;
 use crate::dom::bindings::error::Error;
 use crate::dom::bindings::refcounted::{Trusted, TrustedPromise};
 use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
@@ -120,6 +121,7 @@ impl GPUMethods for GPU {
             Some(GPUPowerPreference::High_performance) => wgpu::PowerPreference::HighPerformance,
             None => wgpu::PowerPreference::Default,
         };
+        let id = self.global().as_window().Navigator().create_adapter_id();
 
         match self.wgpu_channel() {
             Some(channel) => {
@@ -128,6 +130,7 @@ impl GPUMethods for GPU {
                     .send(WebGPURequest::RequestAdapter(
                         sender,
                         wgpu::RequestAdapterOptions { power_preference },
+                        id,
                     ))
                     .unwrap();
             },
diff --git a/components/script/dom/identityhub.rs b/components/script/dom/identityhub.rs
new file mode 100644
index 00000000000..489eaacc78d
--- /dev/null
+++ b/components/script/dom/identityhub.rs
@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use webgpu::wgpu::{AdapterId, Backend, DeviceId, IdentityManager, SurfaceId};
+
+#[derive(Debug)]
+pub struct IdentityHub {
+    adapters: IdentityManager<AdapterId>,
+    devices: IdentityManager<DeviceId>,
+}
+
+impl IdentityHub {
+    fn new(backend: Backend) -> Self {
+        IdentityHub {
+            adapters: IdentityManager::new(backend),
+            devices: IdentityManager::new(backend),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Identities {
+    surface: IdentityManager<SurfaceId>,
+    hub: IdentityHub,
+}
+
+impl Identities {
+    pub fn new() -> Self {
+        let hub = if cfg!(any(target_os = "linux", target_os = "windows")) {
+            IdentityHub::new(Backend::Vulkan)
+        } else if cfg!(any(target_os = "ios", target_os = "macos")) {
+            IdentityHub::new(Backend::Metal)
+        } else {
+            IdentityHub::new(Backend::Empty)
+        };
+
+        Identities {
+            surface: IdentityManager::new(Backend::Empty),
+            hub,
+        }
+    }
+
+    pub fn create_adapter_id(&mut self) -> AdapterId {
+        self.hub.adapters.alloc()
+    }
+}
diff --git a/components/script/dom/mod.rs b/components/script/dom/mod.rs
index 9fbf2e0cc6e..d348633df88 100644
--- a/components/script/dom/mod.rs
+++ b/components/script/dom/mod.rs
@@ -391,6 +391,7 @@ pub mod htmltrackelement;
 pub mod htmlulistelement;
 pub mod htmlunknownelement;
 pub mod htmlvideoelement;
+pub mod identityhub;
 pub mod imagedata;
 pub mod inputevent;
 pub mod keyboardevent;
diff --git a/components/script/dom/navigator.rs b/components/script/dom/navigator.rs
index cb8fb2365cd..9121f7ef54d 100644
--- a/components/script/dom/navigator.rs
+++ b/components/script/dom/navigator.rs
@@ -12,6 +12,7 @@ use crate::dom::bindings::str::DOMString;
 use crate::dom::bluetooth::Bluetooth;
 use crate::dom::gamepadlist::GamepadList;
 use crate::dom::gpu::GPU;
+use crate::dom::identityhub::Identities;
 use crate::dom::mediadevices::MediaDevices;
 use crate::dom::mediasession::MediaSession;
 use crate::dom::mimetypearray::MimeTypeArray;
@@ -23,7 +24,9 @@ use crate::dom::serviceworkercontainer::ServiceWorkerContainer;
 use crate::dom::window::Window;
 use crate::dom::xr::XR;
 use dom_struct::dom_struct;
+use std::cell::RefCell;
 use std::rc::Rc;
+use webgpu::wgpu::AdapterId;
 
 #[dom_struct]
 pub struct Navigator {
@@ -38,6 +41,8 @@ pub struct Navigator {
     permissions: MutNullableDom<Permissions>,
     mediasession: MutNullableDom<MediaSession>,
     gpu: MutNullableDom<GPU>,
+    #[ignore_malloc_size_of = "Defined in wgpu"]
+    gpu_id_hub: RefCell<Identities>,
 }
 
 impl Navigator {
@@ -54,6 +59,7 @@ impl Navigator {
             permissions: Default::default(),
             mediasession: Default::default(),
             gpu: Default::default(),
+            gpu_id_hub: RefCell::new(Identities::new()),
         }
     }
 
@@ -66,6 +72,12 @@ impl Navigator {
     }
 }
 
+impl Navigator {
+    pub fn create_adapter_id(&self) -> AdapterId {
+        self.gpu_id_hub.borrow_mut().create_adapter_id()
+    }
+}
+
 impl NavigatorMethods for Navigator {
     // https://html.spec.whatwg.org/multipage/#dom-navigator-product
     fn Product(&self) -> DOMString {
diff --git a/components/webgpu/lib.rs b/components/webgpu/lib.rs
index 5cb449c6c3c..6439fc9f5e9 100644
--- a/components/webgpu/lib.rs
+++ b/components/webgpu/lib.rs
@@ -13,7 +13,6 @@ use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
 use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
 use servo_config::pref;
 use wgpu::adapter_get_info;
-use wgpu::TypedId;
 
 #[derive(Debug, Deserialize, Serialize)]
 pub enum WebGPUResponse {
@@ -25,7 +24,11 @@ pub type WebGPUResponseResult = Result<WebGPUResponse, String>;
 
 #[derive(Debug, Deserialize, Serialize)]
 pub enum WebGPURequest {
-    RequestAdapter(IpcSender<WebGPUResponseResult>, wgpu::RequestAdapterOptions),
+    RequestAdapter(
+        IpcSender<WebGPUResponseResult>,
+        wgpu::RequestAdapterOptions,
+        wgpu::AdapterId,
+    ),
     RequestDevice,
     Exit(IpcSender<()>),
 }
@@ -93,17 +96,8 @@ impl WGPU {
     fn run(mut self) {
         while let Ok(msg) = self.receiver.recv() {
             match msg {
-                WebGPURequest::RequestAdapter(sender, options) => {
-                    let adapter_id = match wgpu::request_adapter(
-                        &self.global,
-                        &options,
-                        // TODO: The ids we pass here should be generated by the client
-                        &[
-                            wgpu::Id::zip(0, 0, wgpu::Backend::Vulkan),
-                            wgpu::Id::zip(0, 0, wgpu::Backend::Metal),
-                            wgpu::Id::zip(0, 0, wgpu::Backend::Dx12),
-                        ],
-                    ) {
+                WebGPURequest::RequestAdapter(sender, options, id) => {
+                    let adapter_id = match wgpu::request_adapter(&self.global, &options, &[id]) {
                         Some(id) => id,
                         None => {
                             if let Err(e) =