Individual skill
melonjs-effects-and-shaders
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, PixelateEffect, ScanlineEffect, shader, GLSL, WGSL, uniform, setUniform, setTexture, setTime, blendMode, colorMatrix, screen_texture, toFrameTexture, post effect, filter.
packages/melonjs/skills/melonjs-effects-and-shaders/SKILL.md
Source commit a41d6a328557d69a0441d79bbeb9cd6c430275b5
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- Observed behavior
- Network or broad shell
- Last checked
- Nov 5, 2026
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- Repository stars (not skill ratings)
- 6,440
- Repository last updated
- Nov 7, 2026
- License
- MIT
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- html5-game-engine Repository topic
- javascript-game-engine Repository topic
- 2d Repository topic
- agent-skills Repository topic
- canvas Repository topic
- contributions-welcome Repository topic
- game-development Repository topic
- game-framework Repository topic
- gamedev Repository topic
- gltf Repository topic
- writing Derived category
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# 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";
