WebGPU: Handle GpuInteralError

Author: evilpie

CHANGELOG.md

@@ -100,6 +100,10 @@ Bottom level categories:
 
 - Fixed signed integer `%` (and `%=`) returning the wrong result for negative operands in the GLSL (OpenGL/GLES) backend, e.g. `-1 % 768` yielding `255` instead of `-1`. GLSL's `%` is undefined when either operand is negative, so signed remainder is now lowered as `a - b * (a / b)`, matching the SPIR-V, HLSL, and Metal backends. By @mstampfli in [#9687](https://github.com/gfx-rs/wgpu/pull/9687).
 
+#### WebGPU
+
+- Recognize `GPUInternalError` when converting a caught/uncaptured WebGPU error, mapping it to `Error::Internal` instead of panicking with "Unexpected error". By @evilpies in [#9919](https://github.com/gfx-rs/wgpu/pull/9919).
+
 ### Dependency Updates
 
 #### General

wgpu/src/backend/webgpu.rs

@@ -79,6 +79,11 @@ impl crate::Error {
                 source,
                 description: js_error.message(),
             }
+        } else if let Some(js_error) = js_error.dyn_ref::<webgpu_sys::GpuInternalError>() {
+            crate::Error::Internal {
+                source,
+                description: js_error.message(),
+            }
         } else if js_error.has_type::<webgpu_sys::GpuOutOfMemoryError>() {
             crate::Error::OutOfMemory { source }
         } else {

wgpu/src/backend/webgpu/webgpu_sys/gen_GpuInternalError.rs

@@ -89,6 +89,7 @@ const WEB_SYS_FEATURES_NEEDED: &[&str] = &[
     "gpu_map_mode",
     "GpuMipmapFilterMode",
     "GpuMultisampleState",
+    "GpuInternalError",
     "GpuObjectDescriptorBase",
     "GpuOrigin2dDict",
     "GpuOrigin3dDict",