Fluidlogged API

The library adds a third per-block value to each chunk, an optional fluid state that records the fluid a block is logged with, next to the block state and tile entity vanilla already stores. ASM bytecode patching, bundled with Forge, lets vanilla and Forge read and use that stored fluid state. Any block can be made fluidloggable or not through the library's configs, and some common block types are fluidloggable by default, including properly coded modded variants. Mods can also declare their own fluidloggable blocks.

Fluid collision is rebuilt to be more accurate, and several vanilla and modded fluid bugs are fixed, among them lava damage at the corner of a block, a water graphical glitch on diagonal connections, smooth lighting underwater and on the water surface, falling sand with water or lava as its fluid not rendering, block selection missing underwater, and flowing water connecting to waterlogged blocks it should not. The /fluidlogged api print command writes text files listing every active fluidlogging entry.

Subaquatic and Greenery require this library, so it must be installed for either to work. The library is published for Forge only, with 3.3.3 as the latest file for 1.12.2, and it runs on client and server, so the server and every player need it. The code is under a custom license and is not open source, and the author recommends backing up worlds before adding new mods.