Previously, secondary (non-host) split-screen connections used isPrimaryConnection()
to gate nearly all world update packets, meaning the second local player would never
receive tile updates, entity movement, sounds, particles, explosions, etc.
The fix introduces per-connection tracking of which entities and chunks each
ClientConnection has loaded, and uses that information to decide whether a secondary
connection needs to process a given packet or if the primary connection already
handled it.
New members in ClientConnection:
- m_trackedEntityIds: set of entity IDs this connection has received AddEntity/AddMob/AddPlayer etc. for
- m_visibleChunks: set of chunk coordinates (packed into int64) this connection has marked visible
- Both sets are cleared on close(), respawn (dimension change), and destructor
New helpers:
- findPrimaryConnection(): walks the MultiPlayerLevel connection list to find the connection on the primary pad
- shouldProcessForEntity(id): secondary connection skips the packet only if the primary is already tracking that entity
- shouldProcessForPosition(x, z): secondary connection skips the packet only if the primary already has that chunk visible
- anyOtherConnectionHasChunk(x, z): used when a chunk becomes invisible to avoid hiding it from the level if another connection still needs it
- isTrackingEntity(id): public accessor used by shouldProcessForEntity on the primary connection
Packet handler changes:
- handleMoveEntity, handleMoveEntitySmall, handleSetEntityMotion, handleTakeItemEntity:
replaced isPrimaryConnection() with shouldProcessForEntity() so secondary
connections still process movement for entities they know about
- handleExplosion, handleLevelEvent:
replaced isPrimaryConnection() with shouldProcessForPosition() so block
destruction and level events fire for the correct connection based on chunks
- handleChunkTilesUpdate, handleBlockRegionUpdate, handleTileUpdate, handleSignUpdate,
handleTileEntityData, handleTileEvent, handleTileDestruction, handleComplexItemData,
handleSoundEvent, handleParticleEvent:
removed the isPrimaryConnection() guard entirely -- these are world-state updates
that all connections must process regardless of which pad is primary
- handleChunkVisibilityArea / handleChunkVisibility:
now populate m_visibleChunks; on visibility=false, setChunkVisible(false) is
only called on the level if no other connection still has that chunk loaded
- handleAddEntity, handleAddExperienceOrb, handleAddPainting, handleAddPlayer,
handleAddMob: now insert into m_trackedEntityIds on arrival
- handleRemoveEntity: now erases from m_trackedEntityIds on removal
- handleLevelEvent: removed a duplicate levelEvent() call that was always firing
regardless of the isPrimaryConnection() check above it (latent bug)
MultiPlayerLevel: added friend class ClientConnection to allow access to the
connections list without exposing it publicly.
