ChickenShadowLighting - DragoniteSpam/Documentation GitHub Wiki

As with the basic lighting effects, I've made a bunch of videos on how shadowmaps can be done in GameMaker. (In particular, writing your own shadowmapping shaders is a good way around the $5 price tag if you don't feel like paying.)

These, of course, build off of a long line of other shader videos I've done in the past. This is not entry-level stuff.