Code/net/minecraft/world/level/chunk/LevelChunkSection.java

package net.minecraft.world.level.chunk;

import java.util.function.Predicate;
import net.minecraft.core.Holder;
import net.minecraft.core.Registry;
import net.minecraft.network.FriendlyByteBuf;
import net.minecraft.world.level.biome.Biome;
import net.minecraft.world.level.biome.BiomeResolver;
import net.minecraft.world.level.biome.Biomes;
import net.minecraft.world.level.biome.Climate;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.material.FluidState;

public class LevelChunkSection {
    public static final int SECTION_WIDTH = 16;
    public static final int SECTION_HEIGHT = 16;
    public static final int SECTION_SIZE = 4096;
    public static final int BIOME_CONTAINER_BITS = 2;
    private short nonEmptyBlockCount;
    private short tickingBlockCount;
    private short tickingFluidCount;
    private final PalettedContainer<BlockState> states;
    private PalettedContainerRO<Holder<Biome>> biomes;

    private LevelChunkSection(LevelChunkSection p_365547_) {
        this.nonEmptyBlockCount = p_365547_.nonEmptyBlockCount;
        this.tickingBlockCount = p_365547_.tickingBlockCount;
        this.tickingFluidCount = p_365547_.tickingFluidCount;
        this.states = p_365547_.states.copy();
        this.biomes = p_365547_.biomes.copy();
    }

    public LevelChunkSection(PalettedContainer<BlockState> p_282846_, PalettedContainerRO<Holder<Biome>> p_281695_) {
        this.states = p_282846_;
        this.biomes = p_281695_;
        this.recalcBlockCounts();
    }

    public LevelChunkSection(Registry<Biome> p_282873_) {
        this.states = new PalettedContainer<>(Block.BLOCK_STATE_REGISTRY, Blocks.AIR.defaultBlockState(), PalettedContainer.Strategy.SECTION_STATES);
        this.biomes = new PalettedContainer<>(p_282873_.asHolderIdMap(), p_282873_.getOrThrow(Biomes.PLAINS), PalettedContainer.Strategy.SECTION_BIOMES);
    }

    public BlockState getBlockState(int p_62983_, int p_62984_, int p_62985_) {
        return this.states.get(p_62983_, p_62984_, p_62985_);
    }

    public FluidState getFluidState(int p_63008_, int p_63009_, int p_63010_) {
        return this.states.get(p_63008_, p_63009_, p_63010_).getFluidState();
    }

    public void acquire() {
        this.states.acquire();
    }

    public void release() {
        this.states.release();
    }

    public BlockState setBlockState(int p_62987_, int p_62988_, int p_62989_, BlockState p_62990_) {
        return this.setBlockState(p_62987_, p_62988_, p_62989_, p_62990_, true);
    }

    public BlockState setBlockState(int p_62992_, int p_62993_, int p_62994_, BlockState p_62995_, boolean p_62996_) {
        BlockState blockstate;
        if (p_62996_) {
            blockstate = this.states.getAndSet(p_62992_, p_62993_, p_62994_, p_62995_);
        } else {
            blockstate = this.states.getAndSetUnchecked(p_62992_, p_62993_, p_62994_, p_62995_);
        }

        FluidState fluidstate = blockstate.getFluidState();
        FluidState fluidstate1 = p_62995_.getFluidState();
        if (!blockstate.isAir()) {
            this.nonEmptyBlockCount--;
            if (blockstate.isRandomlyTicking()) {
                this.tickingBlockCount--;
            }
        }

        if (!fluidstate.isEmpty()) {
            this.tickingFluidCount--;
        }

        if (!p_62995_.isAir()) {
            this.nonEmptyBlockCount++;
            if (p_62995_.isRandomlyTicking()) {
                this.tickingBlockCount++;
            }
        }

        if (!fluidstate1.isEmpty()) {
            this.tickingFluidCount++;
        }

        return blockstate;
    }

    public boolean hasOnlyAir() {
        return this.nonEmptyBlockCount == 0;
    }

    public boolean isRandomlyTicking() {
        return this.isRandomlyTickingBlocks() || this.isRandomlyTickingFluids();
    }

    public boolean isRandomlyTickingBlocks() {
        return this.tickingBlockCount > 0;
    }

    public boolean isRandomlyTickingFluids() {
        return this.tickingFluidCount > 0;
    }

    public void recalcBlockCounts() {
        class BlockCounter implements PalettedContainer.CountConsumer<BlockState> {
            public int nonEmptyBlockCount;
            public int tickingBlockCount;
            public int tickingFluidCount;

            public void accept(BlockState p_204444_, int p_204445_) {
                FluidState fluidstate = p_204444_.getFluidState();
                if (!p_204444_.isAir()) {
                    this.nonEmptyBlockCount += p_204445_;
                    if (p_204444_.isRandomlyTicking()) {
                        this.tickingBlockCount += p_204445_;
                    }
                }

                if (!fluidstate.isEmpty()) {
                    this.nonEmptyBlockCount += p_204445_;
                    if (fluidstate.isRandomlyTicking()) {
                        this.tickingFluidCount += p_204445_;
                    }
                }
            }
        }

        BlockCounter levelchunksection$1blockcounter = new BlockCounter();
        this.states.count(levelchunksection$1blockcounter);
        this.nonEmptyBlockCount = (short)levelchunksection$1blockcounter.nonEmptyBlockCount;
        this.tickingBlockCount = (short)levelchunksection$1blockcounter.tickingBlockCount;
        this.tickingFluidCount = (short)levelchunksection$1blockcounter.tickingFluidCount;
    }

    public PalettedContainer<BlockState> getStates() {
        return this.states;
    }

    public PalettedContainerRO<Holder<Biome>> getBiomes() {
        return this.biomes;
    }

    public void read(FriendlyByteBuf p_63005_) {
        this.nonEmptyBlockCount = p_63005_.readShort();
        this.states.read(p_63005_);
        PalettedContainer<Holder<Biome>> palettedcontainer = this.biomes.recreate();
        palettedcontainer.read(p_63005_);
        this.biomes = palettedcontainer;
    }

    public void readBiomes(FriendlyByteBuf p_275669_) {
        PalettedContainer<Holder<Biome>> palettedcontainer = this.biomes.recreate();
        palettedcontainer.read(p_275669_);
        this.biomes = palettedcontainer;
    }

    public void write(FriendlyByteBuf p_63012_) {
        p_63012_.writeShort(this.nonEmptyBlockCount);
        this.states.write(p_63012_);
        this.biomes.write(p_63012_);
    }

    public int getSerializedSize() {
        return 2 + this.states.getSerializedSize() + this.biomes.getSerializedSize();
    }

    public boolean maybeHas(Predicate<BlockState> p_63003_) {
        return this.states.maybeHas(p_63003_);
    }

    public Holder<Biome> getNoiseBiome(int p_204434_, int p_204435_, int p_204436_) {
        return this.biomes.get(p_204434_, p_204435_, p_204436_);
    }

    public void fillBiomesFromNoise(BiomeResolver p_282075_, Climate.Sampler p_283084_, int p_282310_, int p_281510_, int p_283057_) {
        PalettedContainer<Holder<Biome>> palettedcontainer = this.biomes.recreate();
        int i = 4;

        for (int j = 0; j < 4; j++) {
            for (int k = 0; k < 4; k++) {
                for (int l = 0; l < 4; l++) {
                    palettedcontainer.getAndSetUnchecked(j, k, l, p_282075_.getNoiseBiome(p_282310_ + j, p_281510_ + k, p_283057_ + l, p_283084_));
                }
            }
        }

        this.biomes = palettedcontainer;
    }

    public LevelChunkSection copy() {
        return new LevelChunkSection(this);
    }
}