[Webkit-unassigned] [Bug 231354] ANGLE Metal RGB textures are slow to initialise compared to RGBA textures when uploading video contents

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231354

--- Comment #2 from Geoff Lang <geofflang at google.com> ---
There are a couple options we've done on different backends:
 - Clear with a GPU clear when possible
 - Use swizzled samplers to always sample 1.0 from the alpha channel of these textures. I think it's still recommended to clear first even with this, there are many paths that need to be aware of this emulated alpha (ReadPixels, CopyTexImage, Blit)
 - If this is a glTexImage2D call with non-null data, you can add a new data upload function that writes the 1.0 alpha.

Otherwise, just try to avoid re-initializing textures too frequently. Caching the allocated textures would avoid this issue.

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