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Add seed validation for server world creation and override-seed property

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The dedicated server previously picked a completely random seed with no
biome diversity checks (the client validates but the server skipped it).
On top of that, the client's findSeed() was hardcoded to only check a
54-chunk (Classic) area, so Large worlds had no diversity guarantee
beyond the center.

New server worlds now use findSeed() scaled to the full target world
size. Added override-seed in server.properties to fix existing worlds
without deleting them.
This commit is contained in:
itsRevela
2026-03-24 13:07:04 -05:00
parent 5dad6c24f7
commit 08f14e32ae
10 changed files with 66 additions and 9 deletions
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8
Minecraft.World/BiomeSource.cpp
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@@ -411,9 +411,9 @@ void BiomeSource::update()
// 4J added - find a seed for this biomesource that matches certain criteria
#ifdef __PSVITA__
int64_t BiomeSource::findSeed(LevelType *generator, bool* pServerRunning) // MGH - added pRunning, so we can early out of this on Vita as it can take up to 60 secs
int64_t BiomeSource::findSeed(LevelType *generator, bool* pServerRunning, int worldSizeChunks)
#else
int64_t BiomeSource::findSeed(LevelType *generator)
int64_t BiomeSource::findSeed(LevelType *generator, int worldSizeChunks)
#endif
{
@@ -440,8 +440,8 @@ int64_t BiomeSource::findSeed(LevelType *generator)
// Raw biome data has one result per 4x4 group of tiles.
// Removing a border of 8 from each side since we'll be doing special things at the edge to turn our world into an island, and so don't want to count things
// in the edge region in case they later get removed
static const int biomeWidth = ( 54 * 4 ) - 16; // Should be even so we can offset evenly
static const int biomeOffset = -( biomeWidth / 2 );
const int biomeWidth = ( worldSizeChunks * 4 ) - 16; // Should be even so we can offset evenly
const int biomeOffset = -( biomeWidth / 2 );
// Storage for our biome indices
intArray indices = intArray( biomeWidth * biomeWidth );