public Chunk getOrCreateChunk(int x, int z) {
random.setSeed((long) x * 341873128712L + (long) z * 132897987541L);
Chunk chunk;
// Get default biome data for chunk
CustomBiomeGrid biomegrid = new CustomBiomeGrid();
biomegrid.biome = new BiomeGenBase[256];
world.getWorldChunkManager().getBiomeGenAt(biomegrid.biome, x << 4, z << 4, 16, 16, false);
// Try extended block method (1.2+)
short[][] xbtypes =
generator.generateExtBlockSections(
CraftServer.instance().getWorld(world.provider.dimensionId),
this.random,
x,
z,
biomegrid);
if (xbtypes != null) {
chunk = new Chunk(this.world, x, z);
ExtendedBlockStorage[] csect = chunk.getBlockStorageArray();
int scnt = Math.min(csect.length, xbtypes.length);
// Loop through returned sections
for (int sec = 0; sec < scnt; sec++) {
if (xbtypes[sec] == null) {
continue;
}
byte[] secBlkID = new byte[4096]; // Allocate blk ID bytes
byte[] secExtBlkID = (byte[]) null; // Delay getting extended ID nibbles
short[] bdata = xbtypes[sec];
// Loop through data, 2 blocks at a time
for (int i = 0, j = 0; i < bdata.length; i += 2, j++) {
short b1 = bdata[i];
short b2 = bdata[i + 1];
byte extb = (byte) ((b1 >> 8) | ((b2 >> 4) & 0xF0));
secBlkID[i] = (byte) b1;
secBlkID[(i + 1)] = (byte) b2;
if (extb != 0) { // If extended block ID data
if (secExtBlkID == null) { // Allocate if needed
secExtBlkID = new byte[2048];
}
secExtBlkID[j] = extb;
}
}
// Build chunk section
csect[sec] = new ExtendedBlockStorage(sec << 4, false); // , secBlkID, secExtBlkID);
}
} else { // Else check for byte-per-block section data
byte[][] btypes =
generator.generateBlockSections(getWorld(world), this.random, x, z, biomegrid);
if (btypes != null) {
chunk = new Chunk(this.world, x, z);
ExtendedBlockStorage[] csect = chunk.getBlockStorageArray();
int scnt = Math.min(csect.length, btypes.length);
for (int sec = 0; sec < scnt; sec++) {
if (btypes[sec] == null) {
continue;
}
csect[sec] = new ExtendedBlockStorage(sec << 4, false); // , btypes[sec], null);
}
} else { // Else, fall back to pre 1.2 method
@SuppressWarnings("deprecation")
byte[] types = generator.generate(getWorld(world), this.random, x, z);
int ydim = types.length / 256;
int scnt = ydim / 16;
chunk = new Chunk(this.world, x, z); // Create empty chunk
ExtendedBlockStorage[] csect = chunk.getBlockStorageArray();
scnt = Math.min(scnt, csect.length);
// Loop through sections
for (int sec = 0; sec < scnt; sec++) {
ExtendedBlockStorage cs = null; // Add sections when needed
byte[] csbytes = (byte[]) null;
for (int cy = 0; cy < 16; cy++) {
int cyoff = cy | (sec << 4);
for (int cx = 0; cx < 16; cx++) {
int cxyoff = (cx * ydim * 16) + cyoff;
for (int cz = 0; cz < 16; cz++) {
byte blk = types[cxyoff + (cz * ydim)];
if (blk != 0) { // If non-empty
if (cs == null) { // If no section yet, get one
cs = csect[sec] = new ExtendedBlockStorage(sec << 4, true);
csbytes = cs.getBlockLSBArray();
}
csbytes[(cy << 8) | (cz << 4) | cx] = blk;
}
}
}
}
// If section built, finish prepping its state
if (cs != null) {
cs.getYLocation();
}
}
}
}
// Set biome grid
byte[] biomeIndex = chunk.getBiomeArray();
for (int i = 0; i < biomeIndex.length; i++) {
biomeIndex[i] = (byte) (biomegrid.biome[i].biomeID & 0xFF);
}
// Initialize lighting
chunk.generateSkylightMap();
return chunk;
}
