412: Another big tracking refactor r=later a=kvark
Fixes#409
Note: there is way more code that had to be thrown out in the process of this PR than there is in the PR itself.
Also fixes [this comment](04e17b3f4f/wgpu-core/src/track/texture.rs (L29)):
> //TODO: make this less awkward!
## Logic
Instead of having a run-time per-operation control over what state is being used for stitching (with `Stitch` enum), we are now deriving this automatically on a per-subresource level. Whenever we are detecting a transition for a sub-resource, and we know there wasn't any "first" state associated with it in the current tracker, we are saving this "first" state. Unlike previous code, where it was confusing what of `Unit` fields (`init`, `last`) are valid, now `first` is `Option<>`, so we know we should be using it if it's there.
This allows us to have this hybrid tracking state of a render pass, where all resources are immutable (and their usage is extended), except for the output attachments. This, together with a whole lot of refactoring, gets us #409.
I'm actually quite happy with the tracking code now. It's finally taking shape we aren't afraid to tell others about :)
Note: this was tested on wgpu-rs examples and vange-rs.
Co-authored-by: Dzmitry Malyshau <kvarkus@gmail.com>
This PR adds `ResourceId::Sampler`, `NativeResource::Sampler` and
`TrackerSet::samplers`. Samplers are (similarly to bind groups)
created with their own life guard and a device id to keep the device
ref count alive. Also added are `extern wgpu_sampler_destroy` and
`sampler_destroy`.
The rest of the implementation was guided by compiler errors, so there
is a good chance I didn't find something crucial that also needed
doing. Please check :)
This PR removes optional backend features in favor of run-time
selection at the `request_adapter` entry point. Adapters from all
supported gpu backends on the platform are reported.
It also makes gfx-rs dependency to be public (for now).
This change merges `Id` with `GenericId` and abstracts away its contents, exposing itself as just u64. This will allow us to encode the backend type into it, in addition to index and epoch.
It also refactors `TypedId` to have a single function extracting all the fields, since this is how it's used all the times anyway.
