Dzmitry Malyshau

Thanks for analyzing and writing this up! Certainly a lot to implement and discuss here.

1. (Having the example `Scene` ...) I see. We need to document this better somehow. 2. (`AbstractScene` trait is actually ...) But actual `Culler` type is an implementation detail, even...

Alternatively, one can just use `RefCell` to cache programs inside the `Technique` implementation to hack around `&self`.

Another problem is that creating new programs on the fly requires `&mut Factory`, which is nowhere near. I need to ether change the interface to include it as a param...

The support got implemented in #27. The only thing left is integrating with Rusterize.

I'd like to talk about progress in [Blade](https://github.com/kvark/blade)

Thank you for all the reports! It looks pretty bad. Is this a regression? Did anyone experience this, say, on 0d760d8d19680b9af2cb7f333c912f6982afed2b before #12340 went in?

One of the things we can do, a very simple one and yet apparently very useful, is to (once again) just blindly prefer NVidia GPU if we are on a...

In order to reduce the scope of the problem, it would be useful to have the affected users trying to reproduce this in Blade examples directly: ``` git clone https://github.com/kvark/blade...

@Jaakkonen that's very helpful! I can at least make sure that we are requesting the HOST_COHERENT flag where we are expecting it, knowing that it's related to the issue.