processing/p5.js

[p5.js 2.0+ Question]: Stroke Scaling is Different in p5 WebGL and WebGPU

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#8,847 opened on May 29, 2026

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Area:WebGLArea:WebGPUDocumentationHelp Wantedp5.js 2.0+

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Description

Most appropriate sub-area of p5.js?

  • Accessibility
  • Color
  • Core/Environment/Rendering
  • Data
  • DOM
  • Events
  • Image
  • IO
  • Math
  • Typography
  • Utilities
  • WebGL
  • WebGPU
  • p5.strands
  • Build process
  • Unit testing
  • Internationalization
  • Friendly errors
  • Other (specify if possible)

p5.js version

Any

Web browser and version

Any

Operating system

macOS 26.5

Steps to reproduce this

Is stroke scaling in p5 WebGL and WebGPU incorrect?

https://editor.p5js.org/quinton-ashley/sketches/ddhGfhknv

Contributor guide

Research direction
Inspect the stroke scaling logic in p5.RendererGL and p5.RendererWebGPU. Trace the `strokeWeight` function to see how scaling is applied differently in WebGL and WebGPU contexts, and compare with the expected behavior from the p5.js specification.
Tech stack
javascript
Domain
frontend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70