Godot 4 - 2D Grid Lighting Demo

implementation based on: https://github.com/nick-paul/LightMask

Godot: https://godotengine.org/

godot-cpp: https://github.com/godotengine/godot-cpp (4.1 branch)

Demo Usage

• Arrow keys to move the camera
• Move the mouse to highlight an area of the TileMap

Notes

• Tested on Godot 4.1.1
• CPU based
• Includes GDExtension C++ version, and GDScript version (You will have to compile the GDExtension version yourself)
• Supports multiple lights, different colors, and configurable how much light a tile blocks.
• Does NOT support multiple sizes of lights, another mask would be needed for that
• GDScript version is included for demonstration purposes, but very slow. It should only be called when an update of lighting is required. C++ version is magnitudes faster.

GDExtension

https://docs.godotengine.org/en/latest/tutorials/scripting/gdextension/what_is_gdextension.html

https://docs.godotengine.org/en/latest/tutorials/scripting/gdextension/gdextension_cpp_example.html

tl;dr:

git clone https://github.com/viraelin/godot4-2d-grid-lighting-demo
cd godot4-2d-grid-lighting-demo
# this is where you clone and build godot-cpp to (or edit SConstruct to point to an existing version for godot-cpp)
scons

To switch between c++ and gdscript version, rename references in main.gd to LightMaskGD and LightMask.