GameMaker Studio 2 Outline Shader
Let's face it, shaders are scary and that's all there is about shaders :) However, they don't always need to be scary. Let's take a look at creating a simple outline shader that we could use for selecting items, hovering over objects and more.
Download the starting project at https://www.dropbox.com/s/g8d08qp9mu5...
You can find the full source code on my Patreon Page / gamemakercasts