webgpu-wgsl-uniformity

WebGPU shader uniformity validation fails when texture sampling, derivatives, or workgroup barriers are placed inside non-uniform control flow. You must hoist these operations into uniform control flow paths so the shader validates correctly and executes safely across invocations.

To fix derivative_uniformity errors in a WGSL fragment shader, you need to rewrite the control flow so derivatives are computed uniformly. This involves hoisting texture sampling operations out of divergent branches and using explicit level or gradient sampling where needed.

Enable and requires directives must be placed correctly at the top of a WGSL shader file. Proper directive placement ensures optional language features like f16 or subgroups compile reliably without triggering shader-creation errors during validation.

Compute barriers in WGSL trigger uniformity errors if called inside divergent control flow. Workgroup barriers must be moved into uniform control flow paths to ensure all threads execute the barrier consistently, preventing shader validation failures.

Yes, you need host-side feature detection for WGSL enable extensions. Pairing shader features with host-side device checks ensures optional capabilities like f16 and subgroups compile reliably and are supported by the target WebGPU device.

The best way to debug subgroup diagnostics in WGSL is to analyze uniformity requirements and ensure subgroup operations are placed in uniform control flow. Correcting directive placement and feature gating resolves diagnostic errors during shader authoring.