Support for importExternalTexture?

[bes]

Hi!

I'm eager to start using wgpu, but for my use-case importExternalTexture is the most important missing piece (specifically for web/WebGL2 & iOS/metal).

For web I want to grab a texture from a HTMLVideoElement and from iOS I can get a MTLTexture.

What is the work needed to reach importExternalTexture for web, and using an external MTLTexture for iOS?

Can I help / contribute in some way?

[davidgarywood]

I too would love this !