Re-implements https://github.com/gfx-rs/wgpu/pull/4886 (CC @Wumpf)
without the `document-features` crate, which has issues integrating into
Firefox builds after being `cargo vendor`ed into its repository. This
issue is being tracked against
https://github.com/slint-ui/document-features/issues/20. Once resolved,
I expect that we will want to revert this PR in its entirety, since
`document-features` is still a good addition to `wgpu`'s documentation
story.
Internally, consensus has already been achieved for this change.
Firefox's ability to build unfortunately take priority over this
particular convenience. Hopefully, we won't have to compromise shortly!
I tested this by ensuring that the HTML output of our existing
`document_features::document_features!(…)` usage was exactly the same.
There should be exactly zero regressions in the current state of
documentation for users. For maintainers, I have added a disclaimer that
one needs to keep changes in sync. with the relevant `Cargo.toml`
manifests.
* Ensure device lost closure is called exactly once before being dropped.
This requires a change to the Rust callback signature, which is now Fn
instead of FnOnce. When the Rust callback or the C closure are dropped,
they will panic if they haven't been called. `device_drop` is changed
to call the closure with a message of "Device dropped." A test is added.
* Remove some locks in BindGroup
These are only written to clear the vectors when triaging bindgroups for destruction, which is not necessary. We can let the reference counts drop when the bind group is dropped.
* Make the mem_leak test pass again
We allocate a String every time we want to get a label for logging. The string is also allocated when logging is disabled. Either way, the allocation is unnecessary. This commit replaces the String with a dyn Debug reference which does not need any allocation.
* Remove the abstractions in resource maps
ResourceMaps had a rather convoluted system for erasing types that isn't needed anywhere except in one place in the triage_resource function. Everywhere else we are always dealing with specific types so using a member of the resource maps is simpler than going through an abstraction. More importantly there was a constraint that all contents of the resource maps implement the Resource trait which got in the way of some of the ongoing buffer snatching changes.
This commit simplifies this by removing the abstraction. Each resource type has its hash map directly in ResourceMaps and it is easier to have different requirements and behaviors depending on the type of the each resource.
* Introduce `dx12` and `metal` crate features to `wgpu`
* Implement dummy `Context` to allow compilation with `--no-default-features`
* Address review
* Remove `dummy::Context` in favor of `hal::api::Empty`
* Add changelog entry
* Panic early in `Instance::new()` if no backend is enabled
Co-Authored-By: Andreas Reich <1220815+Wumpf@users.noreply.github.com>
---------
Co-authored-by: Andreas Reich <1220815+Wumpf@users.noreply.github.com>
