since most blocks have no state data, their lower 8 bits of state data were all zero.
This makes state IDs a bit more distributed for minimal cost.
I considered flipping these around and using type ID in the lower bits directly, but this worsened distribution for walls.
In the worst case, largest number of collisions drops from 11 to 5 with this change, and the number of states with unique hash keys increased from 3518 to 4461 (out of 7638). This is still a long way from perfect, but it's a decent improvement, improving the overall load factor from 1.6 to 1.3.
related to #5604
right now, I don't see an obvious reason to do this. If it turns out I was wrong later on, we can add functionality back, but we can't remove functionality after release.
This was first attempted in f64dc01bd1, but reverted, since I hadn't considered how to handle stripping state data from blocks.
This removes the abusable API RuntimeBlockStateRegistry::fromTypeId() and related methods. These were only used to allow ItemBlocks to magically start referencing other blocks if the blocks were overridden by a plugin, but this was never a well-supported use-case anyway.
Instead of relying on RuntimeBlockStateRegistry, we remember the state that the block had during its constructor, and use that to normalize the non-item properties for asItem().
closes#5609
This reverts commit f64dc01bd1.
I forgot that the ItemBlock constructor implicitly strips off any states
of the origin block, which is something that we unfortunately can't do
any other way right now, since the blocks don't remember their default
states.
