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How to adapt a webgl shader using mouse position to have symmetrical behaviour

I'm trying to create a particular kind of effect for the background of my SpriteKit game, and I've found some shaders on shadertoy that are close to what I want, but I'm struggling to adapt them to do ...
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How to implement color changing fragment shader?

I have a background of a given size and filled with a given color. I want to change it with an animation effect, starting from the center and spread out until it extends the whole background. The new ...