Citadel

Citadel is a foundational library for Alexthe666's ecosystem of mods—a dependency that provides reusable components for custom entity models, procedural animations via Tabula files, dynamic lighting effects, and jukebox-driven entity dances. The library originated as Alexthe666's work and has been adapted and maintained across multiple Minecraft versions. This Fabric port backports the mod to the Fabric loader ecosystem and maintains compatibility with 1.21.11.

The 1.21.11 port required substantial rework of the rendering system. Minecraft 1.21.2+ replaced the legacy entity-render API (direct LivingEntity parameters, PoseStack manipulation, MultiBufferSource access) with a new render-state pipeline where renderers operate on immutable render states and submit geometry through a SubmitNodeCollector. Core mixins targeting EntityModel.setupAnim() and LivingEntityRenderer render logic had to be rewritten to inject into the new submit() method signature, with inject points shifted to BEFORE/AFTER the setupAnim call on the render state. Additionally, model ID codec registration was corrected for 1.21.11's BiMap-based ID_MAPPER structure.

The library exposes hooking points through event classes (EventLivingRenderer with pre/post setup animation phases, EventPosePlayerHand for hand rendering) and interfaces for mods to implement custom animation behavior. A custom Lectern block allows in-game interactive guides. The codebase spans 22k lines of Java, implements pathfinding logic (raycoms advanced navigation with stuck detection, tall-walker support, and custom collision checks), fluid rendering type overrides, sky brightness modulation, and component-based data syncronization via Fabric networking.