Use texture registrar APIs on iOS, Linux & Mac.

[alexmercerind]

• Windows
  • Done.
• Linux
  • Merged Linux: Use texture registrar APIs for video playback #164
  • Texture support added to engine. Linux texture support flutter/engine#24916.
• macOS
  • Merged macOS: Add texture support #122
  • Texture support added to engine. Add texture support for macOS shell. flutter/engine#8507
• iOS
  • Needs to be done. macOS can be used as an example if one wants to work on it.
  • I don't have a mac, please make PR. 🙏
• Android
  • Android support needs to be worked on. I don't have enough motivation now.

[alexmercerind]

@jnschulze are you willing to have look at this sometime in future? (on macOS)

[jnschulze]

@alexmercerind Sure, I might find some time next week.

[lattice0]

How does dart_vlc currently works in linux if linux has no external texture support?

[alexmercerind]

@LucasZanella dart_vlc is older than texture APIs on any of Windows, Linux or macOS. I figured out to use decodeImageFromPixels and sending buffer frame directly... However, this is not the best in terms of performance, but we have no other choice as of now (I have no idea when they'll merge it).

[hansihe]

This seems to be merged on all relevant platforms now, Linux texture support landed earlier today.

[alexmercerind]

Raised #254 to target platform-support centrally.