[Webkit-unassigned] [Bug 246335] 'flat' vertex shader output is extremely slow with 'WebGL via Metal'

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246335

--- Comment #2 from Marcin <msokalski at novomatic-tech.com> ---
Having EXT_provoking_vertex extension would be great, but I don't see it on my iPhone Safari settings and getExtension("EXT_provoking_vertex") returns null. Hopefully with next OS update I can use it.

Regarding performance of drawElements and drawArrays, I have actually opposite experience, drawElements is significantly faster.

Anyway thanks for the info, I was able to work around need for flat varyings, and now Metal backend seams to outperform the older thing.

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