WebGL issues in headless mode on ARM Mac since 111

[Anton Dosov]

Hello, dear Chromium devs 👋

We’re upgrading our headless environment to revision 1095492 (version 111.0.5555.0) and we noticed that WebGL doesn’t seem to be working in headless mode on ARM Mac anymore. We wonder if there is a launch flag we're missing or if we should file a bug or something else.

For example, we try:

chromium/chrome-mac/Chromium.app/Contents/MacOS/Chromium --headless --disable-gpu --screenshot --window-size=1280,1696 https://get.webgl.org/

Which results in 

objc[58489]: Class WebSwapCGLLayer is implemented in both /System/Library/Frameworks/WebKit.framework/Versions/A/Frameworks/WebCore.framework/Versions/A/Frameworks/libANGLE-shared.dylib (0x242c85518) /chromium/chrome-mac/Chromium.app/Contents/Frameworks/Chromium Framework.framework/Versions/111.0.5555.0/Libraries/libGLESv2.dylib (0x106a1fdb0). One of the two will be used. Which one is undefined.

[0321/120806.319954:ERROR:gles2_command_buffer_stub.cc(344)] ContextResult::kFatalFailure: Failed to create context.

[0321/120806.320850:ERROR:gles2_command_buffer_stub.cc(344)] ContextResult::kFatalFailure: Failed to create context.

94887 bytes written to file screenshot.png


We also get the same result in the newer versions.
I checked that the same command worked fine in 1083080 (version 110.0.5478.0).
Note that this appears to be an issue with headless mode. In headful mode, WebGL seems to be working fine.

We also checked the same command on Intel-based Mac, Windows, and Linux and the command works fine in these environments. This appears only to have issues for ARM-based Mac.

We wonder if there is a launch flag we're missing or if we should file a bug or something else.

 

[Andrey Kosyakov]

Hi Anton,

This is a known issue -- headless uses swiftshader by default and swiftshader's support for WebGL is currently disabled on Arm pending the resolution of https://issuetracker.google.com/issues/165000222. As a workaround, you can force hardware GL drivers on mac. The best way to do this starting with m112 is by passing --enable-gpu, m111 and older versions should work with --use-angle.

Best regards,

Andrey.

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[Anton Dosov]

Hi Andrey,

Thank you, this is very helpful

--

Regards,

Anton

Software Engineer, 

Kibana Application Services