192 lines
6.1 KiB
Java
192 lines
6.1 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2023 ViaVersion and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.viaversion.viaversion.protocols.protocol1_13to1_12_2.storage;
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import com.google.common.collect.EvictingQueue;
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import com.viaversion.viaversion.api.Via;
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import com.viaversion.viaversion.api.connection.StorableObject;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Queue;
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import com.viaversion.viaversion.api.minecraft.Position;
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import org.checkerframework.checker.nullness.qual.Nullable;
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public class BlockConnectionStorage implements StorableObject {
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private static Constructor<?> fastUtilLongObjectHashMap;
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private final Map<Long, SectionData> blockStorage = createLongObjectMap();
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@SuppressWarnings("UnstableApiUsage")
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private final Queue<Position> modified = EvictingQueue.create(5);
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// Cache to retrieve section quicker
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private long lastIndex = -1;
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private SectionData lastSection;
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static {
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try {
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//noinspection StringBufferReplaceableByString - prevent relocation
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String className = new StringBuilder("it").append(".unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap").toString();
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fastUtilLongObjectHashMap = Class.forName(className).getConstructor();
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Via.getPlatform().getLogger().info("Using FastUtil Long2ObjectOpenHashMap for block connections");
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} catch (ClassNotFoundException | NoSuchMethodException ignored) {
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}
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}
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public static void init() {
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}
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public void store(int x, int y, int z, int blockState) {
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long index = getChunkSectionIndex(x, y, z);
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SectionData section = getSection(index);
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if (section == null) {
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if (blockState == 0) {
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// No need to store empty sections
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return;
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}
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blockStorage.put(index, section = new SectionData());
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lastSection = section;
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lastIndex = index;
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}
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section.setBlockAt(x, y, z, blockState);
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}
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public int get(int x, int y, int z) {
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long pair = getChunkSectionIndex(x, y, z);
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SectionData section = getSection(pair);
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if (section == null) {
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return 0;
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}
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return section.blockAt(x, y, z);
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}
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public void remove(int x, int y, int z) {
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long index = getChunkSectionIndex(x, y, z);
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SectionData section = getSection(index);
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if (section == null) {
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return;
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}
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section.setBlockAt(x, y, z, 0);
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if (section.nonEmptyBlocks() == 0) {
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removeSection(index);
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}
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}
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public void markModified(Position pos) {
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// Avoid saving the same pos twice
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if (!modified.contains(pos)) {
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this.modified.add(pos);
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}
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}
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public boolean recentlyModified(Position pos) {
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for (Position p : modified) {
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if (Math.abs(pos.x() - p.x()) + Math.abs(pos.y() - p.y()) + Math.abs(pos.z() - p.z()) <= 2) {
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return true;
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}
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}
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return false;
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}
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public void clear() {
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blockStorage.clear();
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lastSection = null;
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lastIndex = -1;
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modified.clear();
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}
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public void unloadChunk(int x, int z) {
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for (int y = 0; y < 16; y++) {
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unloadSection(x, y, z);
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}
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}
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public void unloadSection(int x, int y, int z) {
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removeSection(getChunkSectionIndex(x << 4, y << 4, z << 4));
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}
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private @Nullable SectionData getSection(long index) {
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if (lastIndex == index) {
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return lastSection;
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}
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lastIndex = index;
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return lastSection = blockStorage.get(index);
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}
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private void removeSection(long index) {
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blockStorage.remove(index);
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if (lastIndex == index) {
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lastIndex = -1;
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lastSection = null;
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}
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}
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private static long getChunkSectionIndex(int x, int y, int z) {
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return (((x >> 4) & 0x3FFFFFFL) << 38) | (((y >> 4) & 0xFFFL) << 26) | ((z >> 4) & 0x3FFFFFFL);
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}
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private <T> Map<Long, T> createLongObjectMap() {
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if (fastUtilLongObjectHashMap != null) {
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try {
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//noinspection unchecked
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return (Map<Long, T>) fastUtilLongObjectHashMap.newInstance();
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} catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
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e.printStackTrace();
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}
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}
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return new HashMap<>();
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}
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private static final class SectionData {
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private final short[] blockStates = new short[4096];
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private short nonEmptyBlocks;
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public int blockAt(int x, int y, int z) {
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return blockStates[encodeBlockPos(x, y, z)];
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}
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public void setBlockAt(int x, int y, int z, int blockState) {
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int index = encodeBlockPos(x, y, z);
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if (blockState == blockStates[index]) {
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return;
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}
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blockStates[index] = (short) blockState;
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if (blockState == 0) {
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nonEmptyBlocks--;
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} else {
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nonEmptyBlocks++;
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}
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}
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public short nonEmptyBlocks() {
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return nonEmptyBlocks;
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}
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private static int encodeBlockPos(int x, int y, int z) {
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return ((y & 0xF) << 8) | ((x & 0xF) << 4) | (z & 0xF);
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}
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}
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} |