I'm looking for a shader that I can use to create 2D dynamic shadows using multiple lights and additive blending.

I found a thread by Janbo that gives an example of 2D dynamic shadows. (https://forum.thegamecreators.com/thread/213189) However, it has only ONE light in the center. I have found no example that uses MULTIPLE lights. And I don't understand shaders enough to modify Janbo's shader to support multiple dynamic lights and additive blending. Maybe somebody could help me understand how to modify the code.

I wish I understood shaders better....

Here's a screenshot of the game right now. I think it would benefit greatly from proper shadows.

https://forum.thegamecreators.com/thread/214598

Yes, I've looked through that thread and could not find what I was looking for.

This is not what you're after?
https://forum.thegamecreators.com/thread/212525

It's close, but that and Janbo's method are the same algorithm which are not designed for multiple lights with additive blending. Would have asked in those threads but this forum's rules mean I can't bump those threads so I must create a new one.