fix(op_crates/webgpu): create instance only when required (#9771)

Co-authored-by: Luca Casonato <lucacasonato@yahoo.com>

2 files changed, 20 insertions, 11 deletions

diff --git a/op_crates/webgpu/01_webgpu.js b/op_crates/webgpu/01_webgpu.js
index 743f875e9..1b790914e 100644
--- a/op_crates/webgpu/01_webgpu.js
+++ b/op_crates/webgpu/01_webgpu.js
@@ -14,8 +14,8 @@
   const eventTarget = window.__bootstrap.eventTarget;
 
   /**
-   * @param {any} self 
-   * @param {{prefix: string, context: string}} opts 
+   * @param {any} self
+   * @param {{prefix: string, context: string}} opts
    * @returns {InnerGPUDevice & {rid: number}}
    */
   function assertDevice(self, { prefix, context }) {
@@ -31,9 +31,9 @@
   }
 
   /**
-   * @param {InnerGPUDevice} self 
-   * @param {any} resource 
-   * @param {{prefix: string, resourceContext: string, selfContext: string}} opts 
+   * @param {InnerGPUDevice} self
+   * @param {any} resource
+   * @param {{prefix: string, resourceContext: string, selfContext: string}} opts
    * @returns {InnerGPUDevice & {rid: number}}
    */
   function assertDeviceMatch(
@@ -55,8 +55,8 @@
   }
 
   /**
-   * @param {any} self 
-   * @param {{prefix: string, context: string}} opts 
+   * @param {any} self
+   * @param {{prefix: string, context: string}} opts
    * @returns {number}
    */
   function assertResource(self, { prefix, context }) {
@@ -452,7 +452,7 @@
   const _message = Symbol("[[message]]");
 
   /**
-   * 
+   *
    * @param {string | undefined} reason
    * @param {string} message
    * @returns {GPUDeviceLostInfo}
@@ -524,10 +524,10 @@
   const _device = Symbol("[[device]]");
   const _queue = Symbol("[[queue]]");
 
-  /** 
+  /**
    * @typedef ErrorScope
    * @property {string} filter
-   * @property {GPUError | undefined} error  
+   * @property {GPUError | undefined} error
    */
 
   /**
diff --git a/op_crates/webgpu/lib.rs b/op_crates/webgpu/lib.rs
index 3249b2818..046472905 100644
--- a/op_crates/webgpu/lib.rs
+++ b/op_crates/webgpu/lib.rs
@@ -198,7 +198,16 @@ pub async fn op_webgpu_request_adapter(
 ) -> Result<Value, AnyError> {
   let mut state = state.borrow_mut();
   check_unstable(&state, "navigator.gpu.requestAdapter");
-  let instance = state.borrow::<Instance>();
+  let instance = if let Some(instance) = state.try_borrow::<Instance>() {
+    instance
+  } else {
+    state.put(wgpu_core::hub::Global::new(
+      "webgpu",
+      wgpu_core::hub::IdentityManagerFactory,
+      wgpu_types::BackendBit::PRIMARY,
+    ));
+    state.borrow::<Instance>()
+  };
 
   let descriptor = wgpu_core::instance::RequestAdapterOptions {
     power_preference: match args.power_preference {