<rdar://problem/89550905>

Created attachment 454999 [details]
Patch

Created attachment 455371 [details]
Patch

Created attachment 455373 [details]
Patch

Comment on attachment 455373 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=455373&action=review

Seems fine given that the tests progress. If it's possible to add more WebGL conformance tests covering this area, please do. r+

> Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp:7754
> +        ASSERT_NOT_REACHED();

Just checking - this assert is not hit if the WEBGL_lose_context extension is used incorrectly? (restoreContext() is called, but preventDefault() wasn't called against the lost context event?) I assume that WEBGL_lose_context's validation will catch this misuse - and that the EWS bots are running enough WebGL conformance tests using the WEBGL_lose_context extension.

Comment on attachment 455373 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=455373&action=review

thanks fro spending the time!

> Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp:6489
>          return;

this should prevent the case of calling lose_context.restoreContext() without preventDefault()

>> Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp:7754
>> +        ASSERT_NOT_REACHED();
> 
> Just checking - this assert is not hit if the WEBGL_lose_context extension is used incorrectly? (restoreContext() is called, but preventDefault() wasn't called against the lost context event?) I assume that WEBGL_lose_context's validation will catch this misuse - and that the EWS bots are running enough WebGL conformance tests using the WEBGL_lose_context extension.

Yeah, that's the intention.
E.g. the timer invocation to call maybeRestoreContext should always be prefixed with the check "restoreRequested".
Your question should be handled above..

Committed r291749 (248781@main): <https://commits.webkit.org/248781@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 455373 [details].