forked from GeyserMC/Geyser
107 lines
3.1 KiB
Java
107 lines
3.1 KiB
Java
package org.geysermc.connector.world.chunk;
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import com.nukkitx.network.VarInts;
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import io.netty.buffer.ByteBuf;
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import it.unimi.dsi.fastutil.ints.IntArrayList;
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import it.unimi.dsi.fastutil.ints.IntList;
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import org.geysermc.connector.world.chunk.bitarray.BitArray;
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import org.geysermc.connector.world.chunk.bitarray.BitArrayVersion;
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import java.util.function.IntConsumer;
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/**
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* Adapted from NukkitX: https://github.com/NukkitX/Nukkit
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*/
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public class BlockStorage {
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private static final int SIZE = 4096;
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private final IntList palette;
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private BitArray bitArray;
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public BlockStorage() {
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this(BitArrayVersion.V2);
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}
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public BlockStorage(BitArrayVersion version) {
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this.bitArray = version.createPalette(SIZE);
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this.palette = new IntArrayList(16);
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this.palette.add(0); // Air is at the start of every palette.
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}
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private BlockStorage(BitArray bitArray, IntArrayList palette) {
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this.palette = palette;
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this.bitArray = bitArray;
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}
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private static int getPaletteHeader(BitArrayVersion version, boolean runtime) {
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return (version.getId() << 1) | (runtime ? 1 : 0);
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}
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private static BitArrayVersion getVersionFromHeader(byte header) {
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return BitArrayVersion.get(header >> 1, true);
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}
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public synchronized int getFullBlock(int index) {
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return this.palette.getInt(this.bitArray.get(index));
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}
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public synchronized void setFullBlock(int index, int runtimeId) {
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int idx = this.idFor(runtimeId);
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this.bitArray.set(index, idx);
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}
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public synchronized void writeToNetwork(ByteBuf buffer) {
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buffer.writeByte(getPaletteHeader(bitArray.getVersion(), true));
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for (int word : bitArray.getWords()) {
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buffer.writeIntLE(word);
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}
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VarInts.writeInt(buffer, palette.size());
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palette.forEach((IntConsumer) id -> VarInts.writeInt(buffer, id));
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}
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private void onResize(BitArrayVersion version) {
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BitArray newBitArray = version.createPalette(SIZE);
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for (int i = 0; i < SIZE; i++) {
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newBitArray.set(i, this.bitArray.get(i));
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}
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this.bitArray = newBitArray;
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}
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private int idFor(int runtimeId) {
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int index = this.palette.indexOf(runtimeId);
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if (index != -1) {
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return index;
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}
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index = this.palette.size();
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this.palette.add(runtimeId);
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BitArrayVersion version = this.bitArray.getVersion();
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if (index > version.getMaxEntryValue()) {
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BitArrayVersion next = version.next();
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if (next != null) {
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this.onResize(next);
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}
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}
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return index;
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}
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public boolean isEmpty() {
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if (this.palette.size() == 1) {
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return true;
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}
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for (int word : this.bitArray.getWords()) {
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if (Integer.toUnsignedLong(word) != 0L) {
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return false;
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}
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}
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return true;
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}
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public BlockStorage copy() {
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return new BlockStorage(this.bitArray.copy(), new IntArrayList(this.palette));
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}
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} |