Implement shader barycentrics #8320
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Description
Implements shader barycentrics for vk 1.3+ via VK_KHR_fragment_shader_barycentric BaryCoordKHR, dx12 via SV_Barycentrics, and metal 2.2 via barycentric_coord
Testing
There's a wgpu-gpu test.
Squash or Rebase?
Squash
Checklist
cargo fmt
.taplo format
.cargo clippy --tests
. If applicable, add:--target wasm32-unknown-unknown
cargo xtask test
to run tests.CHANGELOG.md
entry.