[metal] Use raw-window-metal to do layer creation
#6210
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madsmtm
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This uses observers internally, which fixes resizing when using Wgpu together with an auto-layout NSView. Though it probably won't matter much, it's also more reliable to update the scale factor this way, rather than haphazardly in `configure`.
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This was referenced Sep 9, 2024
This is no longer necessary, since Winit can now properly issue redraw events on resize.
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Wumpf
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very appreciated, having that code as part of raw-window-metal sounds great to me :)
As pointed out this will have to wait for the objc2 pr to be approved. cc: @jimblandy
(therefore not putting ✔️ just yet so this doesn't get merged ahead of time)
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You know, all that code and documentation I just wrote in #6107? Let's throw it
awayinto a library, so thatwgpu,ash,vulkano,i-slint-renderer-skiaand so on can all benefit from it.raw-window-metalis that library (existed previously, I've updated it in rust-windowing/raw-window-metal#19).This makes Wgpu depend transitively on
objc2, so the concerns about doing that apply here as well, see also #5641.Description
Use the
raw-window-metalcrate to do layer creation. This uses much the same approach as we do currently, except that it also uses observers internally, which fixes resizing on high DPI screens when using Wgpu together with anNSViewusing auto-layout.Though it probably won't matter much, it's also more reliable to update the scale factor this way, rather than haphazardly in
configure.The logic in
raw-window-metalcould be re-implemented in Wgpu to avoid the dependency, however I deemed it complex enough that I thought it wiser to centralize the implementation in one place.Testing
See #6107 (comment).
Checklist
cargo fmt.cargo clippy.cargo xtask testto run tests.CHANGELOG.md. See simple instructions inside file.