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Testing WebGPU data layouts with Facet

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Matt Keeter

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Description

Testing WebGPU data layouts with Facet is Matt Keeter's 2026 blog post on catching Rust/WGSL struct layout mismatches before they surface as subtle GPU bugs. Keeter shows how Facet reflection metadata plus naga's layout rules can be exercised in unit tests that compare host-side Rust structs against WGSL definitions used in compute shaders.

The walkthrough covers padding, array strides, and field offsets in shared configuration buffers passed to WebGPU compute passes. Keeter emphasizes failures that appear only on certain GPU drivers when host and shader disagree about alignment, a common pain point in wgpu projects that mix Rust and WGSL by hand.

Readers should know Rust, basic WGSL, and how wgpu binds storage buffers. The article targets intermediate WebGPU developers who already ship compute workloads and want automated guards around cross-language type sharing.

The post is published on mattkeeter.com with code excerpts readers can adapt into their own test harnesses. It is a single article tied to a concrete Facet release rather than a standing documentation site.

Keeter's wgpu and CAD tooling posts are well regarded in the Rust graphics community; this layout-testing pattern is cited informally among wgpu maintainers and application authors hardening production shaders.