Seoul Engine Animation2D source code (Spine Runtime)
Animation2D is a Seoul Engine implementation of a Spine runtime: https://github.com/EsotericSoftware/spine-runtimes
The Seoul Engine code is available under a separate repo: https://github.com/demiurgestudios/seoulengine
Please note that portions of the Animation2D code are based on the stock Spine C runtime and are therefore subject to the license terms of the Spine Runtime license: https://github.com/EsotericSoftware/spine-runtimes/blob/master/spine-c/LICENSE
To enable Animation2D support, extract the Animation2D repository into the SeoulEngine\Code\Animation2D folder, and then set SEOUL_WITH_ANIMATION_2D to 1 in BuildFeatures.h.
Once enabled, Animation2D must be paired with v3.8.79 of the Spine editor to generate compatible JSON animation data.