melonjs-effects-and-shaders SKILL.md skillA
melonjs-effects-and-shaders from melonjs/melonjs is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add melonjs/melonjs/melonjs-effects-and-shaders@git:20261102.a41d6a3Pins git:20261102.a41d6a3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- melonjs/melonjs
- Path
packages/melonjs/skills/melonjs-effects-and-shaders/SKILL.md- Versions recorded
- 9
- Latest version
- git:20261102.a41d6a3, committed Nov 2, 2026
- First version recorded
- Oct 20, 2026
- Size
- 39,462 bytes
- Repository stars
- 6,441
- License
- MIT
Use this skill for post-processing effects, custom shaders, blend modes and colour grading in melonJS. Covers the built-in ShaderEffect presets, addPostEffect on renderables and cameras, writing a custom dual-language GLSL/WGSL effect, the screen_texture builtins, and why effects silently do nothing on the Canvas fallback. Triggers on: Tween, easing, animate an effect, ShaderEffect, addPostEffect, removePostEffect, getPostEffect, postEffectNeedsCapture, VignetteEffect, GlowEffect, BlurEffect…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Post effects and custom shaders
> melonJS ships a catalogue of post effects and a dual-language shader system.
> The recurring trap is that every shader path needs a GPU backend and
> **degrades to nothing** on Canvas rather than erroring. Blend modes are the
> exception — those work on all three renderers.
## Applying an effect
Effects attach to a renderable **or** to a camera (for full-screen grading):
```js
import { VignetteEffect, GlowEffect } from "melonjs";
sprite.addPostEffect(new GlowEffect(app.renderer));
app.viewport.addPostEffect(new VignetteEffect(app.renderer));
```
`renderable.shader = …` is **deprecated since 19.2.0**, and its setter destroys
whatever it replaces. Use `addPostEffect` / `getPostEffect` / `removePostEffect`.
### A camera effect covers the HUD too
A camera's post-effect brackets the **entire** world draw — floating children
included. So the obvious way to write a full-screen pass also washes over every
HUD label in that world, which is rarely what you want.
To land a pass *after* the world but *before* the HUD, host the effect on a
screen-filling floating renderable ordered below the HUD's z instead:
```js
…Read the whole file at its exact version.
How to install
mdr add melonjs/melonjs/melonjs-effects-and-shaders@sha256:39f3b28a80dbf106The line at the top of this page pins the label git:20261102.a41d6a3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_7q3me43pjbjy5q42)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 9 versions of this file, between Oct 20, 2026 and Nov 2, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261102.a41d6a3 latest | 2026-11-02 | a41d6a3 | 39,462 B | A | view · diff |
| git:20261030.3d5fa8a | 2026-10-30 | 3d5fa8a | 39,243 B | A | view · diff |
| git:20261029.5ef1596 | 2026-10-29 | 5ef1596 | 39,109 B | A | view · diff |
| git:20261029.05ed64b | 2026-10-29 | 05ed64b | 38,275 B | A | view · diff |
| git:20261026.3076f99 | 2026-10-26 | 3076f99 | 36,994 B | A | view · diff |
| git:20261025.d9abca5 | 2026-10-25 | d9abca5 | 36,662 B | A | view · diff |
| git:20261024.d7db994 | 2026-10-24 | d7db994 | 34,925 B | A | view · diff |
| git:20261022.645ffe9 | 2026-10-22 | 645ffe9 | 34,264 B | A | view · diff |
| git:20261020.3210d5c | 2026-10-20 | 3210d5c | 32,873 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (39462 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
melonjs/melonjs · 6,441 stars · license MIT · pushed 2026-11-06 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_7q3me43pjbjy5q42 GET https://markdownregistry.com/api/v1/resolve?ref=melonjs/melonjs/melonjs-effects-and-shaders GET https://markdownregistry.com/api/v1/blob/39f3b28a80dbf1068203842311dedd9d35e263818fa20781d32c22cc0d86e93f
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