Closes#84
# Changes
- Implemented new algorithm for tracking loaded entities and chunks.
- The client does not need to maintain a list of loaded chunks and
entities anymore, as this information can be inferred using carefully
maintained data from the previous tick.
- Chunks are used as a spatial partition for entities. Entity visibility
is now based on chunk visibility rather than the euclidean distance to
clients.
- The BVH is no longer strictly necessary, so it has been moved to the
new `valence_spatial_index` crate.
- The API has been generalized to support things other than entities.
The crate does not have a dependency on the main `valence` crate.
- Chunk, entity, and player list packets are now aggressively cached to
increase performance.
- Chunk packets now include some filler light data. This makes the
vanilla client lag a lot less.
- Entities and chunks must now be marked as deleted before they are
removed.
- Improved `ChunkPos` interface.
- Added function to get the duration per tick.
- Added `Index` and `IndexMut` impls to collection types.
As a result of the above changes, performance under heavy load has
increased significantly. With the rust-mc-bot test on my machine, I went
from a max of ~1000 players to ~4000 players.
Closes#83
This PR aims to move all of Valence's networking code to the new
`valence_protocol` crate. Anything not specific to valence is going in
the new crate. It also redesigns the way packets are defined and makes a
huge number of small additions and improvements. It should be much
easier to see where code is supposed to go from now on.
`valence_protocol` is a new library which enables interactions with
Minecraft's protocol. It is completely decoupled from valence and can be
used to build new clients, servers, tools, etc.
There are two additions that will help with #5 especially:
- It is now easy to define new packets or modifications of existing
packets. Not all packets need to be bidirectional.
- The `CachedEncode` type has been created. This is used to safely cache
redundant calls to `Encode::encode`.
This change was made to make it easier for invariants to be upheld. When
the spatial partition is added, we can ensure that changes to entities
are immediately reflected in the partition. Additionally, chunks being
shared between worlds was a leaky abstraction to begin with and is now
removed. A method in `Config` is now necessary to determine what world a
client should join.
Along with this, most mutable references have been wrapped in a newtype
to ensure that `mem::swap` cannot be used on them, which would break
invariants. This is analogous to `Pin<&mut T>`. The reason we can't use
Pin directly is because it would require unnecessary unsafe code
within the library.
