webgpu-wgsl-vertex-shaders

Validate WGSL vertex shaders for WebGPU position outputs, vertex locations, and interpolation rules.

Updated May 20, 2026
One-click install
npx skills add https://github.com/Impertio-Studio/WebGPU-Claude-Skill-Package --skill webgpu-wgsl-vertex-shaders
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: webgpu-wgsl-vertex-shaders
Source: https://github.com/Impertio-Studio/WebGPU-Claude-Skill-Package/tree/main/skills/source/webgpu-wgsl/webgpu-wgsl-vertex-shaders
Command: npx skills add https://github.com/Impertio-Studio/WebGPU-Claude-Skill-Package --skill webgpu-wgsl-vertex-shaders

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps you write WGSL vertex shaders that compile cleanly and connect correctly to WebGPU pipelines, avoiding common validation failures caused by missing clip-space position outputs, mismatched attribute locations, and invalid interpolation rules.

Core Features & Use Cases

  • Vertex Input Mapping: Declares the correct vertex attributes and builtin inputs for buffer-driven and vertex-pulling workflows.
  • Interpolation Safety: Prevents shader-creation errors by enforcing flat interpolation for integer varyings and consistent varyings across stages.
  • Pipeline Correctness: Covers clip-space position output, instancing, invariant depth behavior, and WebGPU-specific constraints that affect rendering reliability.
  • Use Case: Use it when building a render pipeline, authoring a compute-generated mesh path, or debugging a shader that fails because its inputs, outputs, or interpolation settings do not match the host layout.

Quick Start

Ask the skill to generate or review a WGSL vertex shader for your pipeline so it matches the host vertex layout, includes a clip-space position output, and applies the correct interpolation rules.

Frequently Asked Questions about webgpu-wgsl-vertex-shaders

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why does my WGSL vertex shader fail validation with missing position outputs?

WGSL vertex shaders fail validation when missing position outputs because WebGPU requires the vertex stage to output a clip-space position. Ensuring the correct builtin position output is declared prevents this pipeline creation error.

How do I fix mismatched vertex locations in a WebGPU render pipeline?

Mismatched vertex locations in a WebGPU render pipeline are fixed by aligning your shader's @location attributes with the host's vertex buffer layout. Matching shaderLocation bindings ensures the vertex stage correctly reads buffer inputs.

Do I need flat interpolation for integer varyings in WGSL?

Yes, you need flat interpolation for integer varyings in WGSL because WebGPU disallows interpolating integer values. Enforcing flat interpolation for these varyings prevents shader creation errors and ensures consistent stage data.

How do I set up vertex pulling in a WGSL vertex shader?

Setting up vertex pulling in a WGSL vertex shader involves declaring the correct vertex attributes and builtin inputs to read directly from bound storage buffers. This approach bypasses traditional vertex buffers for dynamic mesh data.

What are the WebGPU vertex-stage restrictions for instancing?

WebGPU vertex-stage restrictions for instancing require matching shaderLocation bindings and correct builtin inputs to identify the instance index. Adhering to these constraints ensures reliable instanced rendering across multi-pass pipelines.

How to write a WGSL vertex shader for a depth-correct multi-pass pipeline?

Writing a WGSL vertex shader for a depth-correct multi-pass pipeline requires invariant depth behavior and correct clip-space position output. Maintaining consistent interpolation rules across stages ensures depth values match precisely.