Core OpenGL bindings

[nicoburns]

I've been doing some analysis of Servo crates and came across this one https://github.com/servo/cgl-rs, which is I believe is minimal bindings to Apple's Core OpenGL framework. I wanted to point it out to this project as I know you've been looking at Servo's other Apple binding crates (https://github.com/servo/core-foundation-rs).

And I wanted to see whether this would/could be in scope for the objc2 project? I saw some docs currently suggest that people use Metal instead of OpenGL which is somewhat reasonable but also unlikely to be feasible for the Servo project anytime soon as WebRender is OpenGL based.

If not, then it's probably not a big deal for us to continue to maintain the existing cgl crate (it's not much code). But I at least wanted to make you aware that there's demand for a crate covering this framework.

[madsmtm]

Hmm, I've been fairly hesitant to do this in the past, because OpenGL is quite discouraged by Apple, and the bindings can be very C-centric.

I even opted to hand-write the AppKit + OpenGL bindings in glutin:
https://github.com/rust-windowing/glutin/blob/73ce4f91543a008b501985e065b5bb0ae4ae2c44/glutin/src/api/cgl/appkit.rs

But maybe I should reconsider that decision now that I've mapping other old C-centric frameworks like CoreServices, ApplicationServices and Carbon, perhaps it's not as bad as I've been fearing?