Chunked World Savegame Format for Fast Autosaving

[curioustorvald]

• A chunk is 90x90 tiles in size (90 turns out to be balanced being small in size yet efficient in compression)
• A world gotta be able to hold at least 1048576 chunks
• A world's layer count is less than 16 layers
  → this neatly packs into a 24-bit number, like this: 0xLC_CCCC
  And then we can put World Index onto this, like: 0xWW_WWLC_CCCC

Since 0..0xFFFFFFFF is occupied, we should use different address space, e.g. 0x0000_WWWW_LLCC_CCCC, and just occupy larger address space because why not?
(note: world index starts from 1)

0x0000_0000_0000_WWWW holds World Meta information.

[curioustorvald]

Seems working, only thing left to do is actually implementing an autosave and see if it's actually significantly faster than saving the entire world.

[curioustorvald]

Chunks should be stored vertically from top-left, just like the worldgen