Bug 1853952 - Add a pref to assert that wgpu tests run on hardware. r=webgpu-reviewers,ErichDonGubler

Differential Revision: https://phabricator.services.mozilla.com/D188726

gfx/wgpu_bindings/src/server.rs

@@ -160,6 +160,14 @@ pub unsafe extern "C" fn wgpu_server_adapter_pack_info(
                 backend,
             } = gfx_select!(id => global.adapter_get_info(id)).unwrap();
 
+            if static_prefs::pref!("dom.webgpu.testing.assert-hardware-adapter") {
+                let is_hardware = match device_type {
+                    wgt::DeviceType::IntegratedGpu | wgt::DeviceType::DiscreteGpu => true,
+                    _ => false,
+                };
+                assert!(is_hardware, "Expected a hardware gpu adapter, got {:?}", device_type);
+            }
+
             let info = AdapterInformation {
                 id,
                 limits: restrict_limits(gfx_select!(id => global.adapter_limits(id)).unwrap()),

modules/libpref/init/StaticPrefList.yaml

@@ -4531,6 +4531,13 @@
   mirror: always
   rust: true
 
+# For testing purposes, crash if we don't get a hardware adapter.
+- name: dom.webgpu.testing.assert-hardware-adapter
+  type: RelaxedAtomicBool
+  value: false
+  mirror: always
+  rust: true
+
 # Is support for HTMLInputElement.webkitEntries enabled?
 - name: dom.webkitBlink.filesystem.enabled
   type: bool

testing/web-platform/meta/webgpu/__dir__.ini

@@ -1,3 +1,3 @@
-prefs: [dom.webgpu.enabled:true]
+prefs: [dom.webgpu.enabled:true, dom.webgpu.testing.assert-hardware-adapter:true]
 lsan-allowed: [Alloc, mozilla::net::nsServerSocket::CreateClientTransport]
 leak-threshold: [default:51200]

testing/web-platform/mozilla/meta/webgpu/__dir__.ini

@@ -1,4 +1,4 @@
-prefs: [dom.webgpu.enabled:true]
+prefs: [dom.webgpu.enabled:true, dom.webgpu.testing.assert-hardware-adapter:true]
 tags: [webgpu]
 disabled:
   if release_or_beta: https://mozilla-hub.atlassian.net/browse/FFXP-223