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Cannot run WebGPU tests on Chrome because of "--use-gl=swiftshader" #27994
Description
I find that if I run Emscripten tests in Chrome, all the WebGPU tests
browser.test_webgpu_required_limits
browser.test_webgpu_basic_rendering_pthreads
browser.test_webgpu_basic_rendering_main_module
browser.test_webgpu_basic_rendering
browser.test_webgpu_basic_rendering_closure
browser.test_webgpu_basic_rendering_closure_advanced
fail, because no WebGPU contexts are available.
This issue goes away if I remove --use-gl=swiftshader from ChromeConfig in browser_common.py.
Any thoughts of why that flag is present there? Are WebGPU tests skipped on CircleCI? Could we remove --use-gl=swiftshader or put it behind a separate CircleCI-specific EMTEST_BROWSER_ARGS=... env. var that would be injected to browser launch?
Activity
juj commentedon Oct 16, 2026
Looks like there's
emscripten/.circleci/config.yml
Line 1058 in fb115aa
so WebGPU tests are skipped.
sbc100 commentedon Oct 16, 2026
Maybe
--use-gl=swiftshaderis only needed for running tests headless? Perhaps it that flag could be moved fromdefault_flagstoheadless_flags?