WebGLOnWebGPU.md

WebGL on WebGPU

Status: Work in progress. Development on the ANGLE backend and the Blink integration is underway.

WebGLOnWebGPU adds a WebGPU backend to ANGLE. Chrome can then convert WebGL calls into WebGPU calls inside the renderer process and leave the rest to Dawn, which shrinks the GPU process attack surface.

Source

Component	Repo	Location
ANGLE backend	ANGLE	src/libANGLE/renderer/wgpu/
Compiler backend	ANGLE	src/compiler/translator/wgsl/
Chrome bindings	Chromium	third_party/blink/renderer/modules/webgl/webgl_rendering_context_webgpu_base.cc

Build

The backend builds by default on most platforms. To turn it on explicitly, add this to args.gn:

angle_enable_wgpu = true

Testing

angle_end2end_tests

autoninja -C out/Release angle_end2end_tests
out/Release/angle_end2end_tests --gtest_filter=*WebGPU*

Expectations: angle_end2end_tests_expectations.txt. Search for WGPU to find the WebGPU entries.

dEQP

autoninja -C out/Release angle_deqp_gles2_tests angle_deqp_gles3_tests
out/Release/angle_deqp_gles2_tests --use-angle=webgpu
out/Release/angle_deqp_gles3_tests --use-angle=webgpu

Expectations: deqp_gles2_test_expectations.txt, deqp_gles3_test_expectations.txt and the neighbouring files. Search for WGPU to find the WebGPU entries.

To look at the results, use Cherry, a web app that shows image diffs and test logs. See dEQP.md#check-your-results.

WebGL CTS (Chrome)

No extra build flags are needed. Run Chrome with:

--enable-features=WebGLOnWebGPU

Navigate to the WebGL conformance tests.