Enable WebGPU render test. NFC

Author: sbc100

.circleci/config.yml

@@ -354,8 +354,9 @@ commands:
             CHROME_FLAGS_HEADLESS: "--headless --remote-debugging-port=1234"
             CHROME_FLAGS_WASM: "--enable-experimental-webassembly-features --js-flags=\"--experimental-wasm-memory64 --experimental-wasm-stack-switching --experimental-wasm-type-reflection\""
             CHROME_FLAGS_NOCACHE: "--disk-cache-dir=/dev/null --disk-cache-size=1 --media-cache-size=1 --disable-application-cache --incognito"
+            CHROME_FLAGS_WEBGPU: "--enable-unsafe-webgpu --use-webgpu-adapter=swiftshader --enable-features=Vulkan"
           command: |
-            export EMTEST_BROWSER="/usr/bin/google-chrome $CHROME_FLAGS_BASE $CHROME_FLAGS_HEADLESS $CHROME_FLAGS_WASM $CHROME_FLAGS_NOCACHE"
+            export EMTEST_BROWSER="/usr/bin/google-chrome $CHROME_FLAGS_BASE $CHROME_FLAGS_HEADLESS $CHROME_FLAGS_WASM $CHROME_FLAGS_NOCACHE $CHROME_FLAGS_WEBGPU"
             # There are tests in the browser test suite that using libraries
             # that are not included by "./embuilder build ALL".  For example the
             # PIC version of libSDL which is used by test_sdl2_misc_main_module

test/webgpu_basic_rendering.cpp

@@ -24,11 +24,7 @@ void GetDevice(void (*callback)(wgpu::Device)) {
         if (message) {
             printf("RequestAdapter: %s\n", message);
         }
-        if (status == WGPURequestAdapterStatus_Unavailable) {
-            printf("WebGPU unavailable; exiting cleanly\n");
-            // exit(0) (rather than emscripten_force_exit(0)) ensures there is no dangling keepalive.
-            exit(0);
-        }
+        assert(status != WGPURequestAdapterStatus_Unavailable && "WebGPU unavailable");
         assert(status == WGPURequestAdapterStatus_Success);
 
         wgpu::Adapter adapter = wgpu::Adapter::Acquire(cAdapter);