I've also been really impressed with glium. I don't think I've ever had as nice of a blank editor -> quad on the screen experience in a long while. At least since the days of fixed-function.
I say this as someone who's written ~2 commercial renderers from some various degrees from scratch. Normally it's 1-2 days to just setup all the various infra for handling shaders/uniforms/etc.
That includes: Window creation and event handling, fragment shader, vertex shader, varying declaration and binding. Uniforms are pretty trivial on top of this(also done via macros so there's no raw strings).
Next time I'm starting up a GL project it's going to be hard for me to argue C/C++ given how nice some of the semantics around Rust's OpenGL libraries are.
OpenGL is set up to optimize for all those things, instead of optimizing for the learner/simple case.
It's definitely a valid approach, but it means for simple cases, you're copy & pasting a lot of boilerplate for performance, control, and a slew of other things you don't need.
You have to learn/paste a lot before you get a little reward.
I say this as someone who's written ~2 commercial renderers from some various degrees from scratch. Normally it's 1-2 days to just setup all the various infra for handling shaders/uniforms/etc.