How to modulate part of a TileMap?

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:bust_in_silhouette: Asked By Pwyred

Apologies if this question has already been asked; I wasn’t finding anything when searching.

I’m trying to implement sunlight in a 2D game, so that the majority of the base TileMap is “cloudy”, but there is a portion of the map that is sunny. I don’t think it’s possible to modulate individual tiles within the tilemap, so I’m not sure what my best option is.

Is this something I could do with a shader and a mask? If so, is it possible to have a dynamic mask so that the sunlight area can move across the screen, etc?