Field of view in a tile based 2d game

I have been building a turn based roguelike using prefabs for the terrain. I am trying to figure out an efficient way to determine the players field of view and lighting for a fog of war layer. I have been looking at options such as using Bresenham's line algorithm to ray cast around the player (Which would require about 100 rays for a view distance of 12) or some kind of shadowcasting.

I am wondering if there is a way to use something built into Unity to do this. For each tile I need to determine if it is visible (Based on existing methods that return a bool) and the light level (Based on distance from the source)

Edit: The existing methods just indicate if the tile blocks line of sight, not if it is visible itself.

Any suggestions?

 

I am trying to determine if the tile is in the players 360 degree field of view. I have implemented this with a derivative of my Line of Sight algorithm and it seems to be performant enough. I just thought there might be some way to use Unity's built in raycasting or some other feature instead of brute forcing it like this.

I am drawing a Bresenhams line from the player to each point on the perimeter of a square around the player and setting the alpha of a "Fog" prefab (that is in a layer between the Player and UI and the rest of the map and enemy sprites) to transparent. each time the fog layer is updated I am first setting any transparent fog sprites to 75% alpha before clearing the ones in the players current field of view to transparent so that previously visited areas are still visible but are tinted (Enemies and items automatically disable their sprite renderers when out of the players FoV so they do not show)

Later I plan to cull any line over a certain length so that the field of view is more circular. I also plan to set different alphas, based on the distance from the player and the players light source to simulate lighting. I would also like to animate the alphas to simulate flights flickering

In the future I may update the FoV algorithm to some form of shadowcasting but as it is now it is working for me.