Jerome Renaux at Dynetis Games has published new tutorial: "This article introduces you to what shaders can do. I’ll showcase a few cool effects you can achieve with custom shaders and show how to apply them to your Phaser 3 game.
I will provide a high-level explanation of what shaders are. I will not however cover in details all the things you can do with them. Good references already exist for that, such as the book of shaders or this resource.
But as the saying goes, “a nice demo with a few shaders is worth 1,000 words”. So here are the links to the demo I have made."