Code/net/minecraft/network/protocol/game/VecDeltaCodec.java

package net.minecraft.network.protocol.game;

import net.minecraft.world.phys.Vec3;
import org.jetbrains.annotations.VisibleForTesting;

public class VecDeltaCodec {
    private static final double TRUNCATION_STEPS = 4096.0;
    private Vec3 base = Vec3.ZERO;

    @VisibleForTesting
    static long encode(double p_238018_) {
        return Math.round(p_238018_ * 4096.0);
    }

    @VisibleForTesting
    static double decode(long p_238020_) {
        return p_238020_ / 4096.0;
    }

    public Vec3 decode(long p_238022_, long p_238023_, long p_238024_) {
        if (p_238022_ == 0L && p_238023_ == 0L && p_238024_ == 0L) {
            return this.base;
        } else {
            double d0 = p_238022_ == 0L ? this.base.x : decode(encode(this.base.x) + p_238022_);
            double d1 = p_238023_ == 0L ? this.base.y : decode(encode(this.base.y) + p_238023_);
            double d2 = p_238024_ == 0L ? this.base.z : decode(encode(this.base.z) + p_238024_);
            return new Vec3(d0, d1, d2);
        }
    }

    public long encodeX(Vec3 p_238026_) {
        return encode(p_238026_.x) - encode(this.base.x);
    }

    public long encodeY(Vec3 p_238028_) {
        return encode(p_238028_.y) - encode(this.base.y);
    }

    public long encodeZ(Vec3 p_238030_) {
        return encode(p_238030_.z) - encode(this.base.z);
    }

    public Vec3 delta(Vec3 p_238032_) {
        return p_238032_.subtract(this.base);
    }

    public void setBase(Vec3 p_238034_) {
        this.base = p_238034_;
    }

    public Vec3 getBase() {
        return this.base;
    }
}