Multiply the colour by a sine of the pixel row and every other line goes dim: scanlines. A smoothstep around a y that moves with time is the roll bar old monitors had. Both are one line each, and both are in the Space Game's start screen.

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Live
rive-shader-library.revIn the Scripting Course

Scanlines on its own artboard in the library file, with the ShaderQuad node and the WGSL, Inputs for Density, Roll. Copy the artboard into any Rive file.

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Halftone
Stars
Caustics
Free Rive file

Noise, as a Rive file, on us

The Noise shader with the GPU Canvas node wired and the WGSL inside. Drop it into any Rive file and see how a shader lives there.

The other 27, in the course

Every shader here, as a ready-to-drop Rive file

Play with all of them here. The library file, every shader on its own artboard, comes with the Scripting Course, next to the lessons and the Space Game it belongs to.