Track: webgpu-headers upgrade in wgpu-native

[kolkov]

Summary

wgpu-native v27.0.4.0 uses outdated webgpu-headers (commit bac5208 from Nov 2024), which is 104 commits behind the current main branch.

This causes enum value mismatches between gputypes (follows current webgpu-headers) and wgpu-native.

Example: BGRA8Unorm is 27 in current headers but 23 in wgpu-native.

Current Workaround

We implemented a conversion layer in wgpu/convert.go to translate between gputypes and wgpu-native enum values.

Upstream Tracking

• Issue: there are inconsistencies between wgpu.h and webgpu.h gfx-rs/wgpu-native#546
• Active PR: Modified Webgpu to work with the stable webgpu-header. gfx-rs/wgpu-native#536
• Our comment: there are inconsistencies between wgpu.h and webgpu.h gfx-rs/wgpu-native#546 (comment)

Blocker

PR #536 is blocked by CI issues on Android, iOS, and Windows i686 platforms.

Resolution

Once wgpu-native merges the header update:

1. Update wgpu-native dependency
2. Remove the conversion layer from wgpu/convert.go
3. Simplify FFI structs