57 lines
2.5 KiB
Java
57 lines
2.5 KiB
Java
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package net.minecraft.world.level.levelgen;
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import com.google.common.annotations.VisibleForTesting;
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import com.google.common.base.Charsets;
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import com.google.common.hash.HashFunction;
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import com.google.common.hash.Hashing;
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import com.google.common.primitives.Longs;
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import java.util.concurrent.atomic.AtomicLong;
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public final class RandomSupport {
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public static final long GOLDEN_RATIO_64 = -7046029254386353131L;
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public static final long SILVER_RATIO_64 = 7640891576956012809L;
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private static final HashFunction MD5_128 = Hashing.md5();
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private static final AtomicLong SEED_UNIQUIFIER = new AtomicLong(8682522807148012L);
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@VisibleForTesting
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public static long mixStafford13(long p_189330_) {
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p_189330_ = (p_189330_ ^ p_189330_ >>> 30) * -4658895280553007687L;
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p_189330_ = (p_189330_ ^ p_189330_ >>> 27) * -7723592293110705685L;
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return p_189330_ ^ p_189330_ >>> 31;
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}
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public static RandomSupport.Seed128bit upgradeSeedTo128bitUnmixed(long p_289660_) {
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long i = p_289660_ ^ 7640891576956012809L;
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long j = i + -7046029254386353131L;
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return new RandomSupport.Seed128bit(i, j);
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}
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public static RandomSupport.Seed128bit upgradeSeedTo128bit(long p_189332_) {
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return upgradeSeedTo128bitUnmixed(p_189332_).mixed();
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}
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public static RandomSupport.Seed128bit seedFromHashOf(String p_288994_) {
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byte[] abyte = MD5_128.hashString(p_288994_, Charsets.UTF_8).asBytes();
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long i = Longs.fromBytes(abyte[0], abyte[1], abyte[2], abyte[3], abyte[4], abyte[5], abyte[6], abyte[7]);
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long j = Longs.fromBytes(abyte[8], abyte[9], abyte[10], abyte[11], abyte[12], abyte[13], abyte[14], abyte[15]);
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return new RandomSupport.Seed128bit(i, j);
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}
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public static long generateUniqueSeed() {
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return SEED_UNIQUIFIER.updateAndGet(p_224601_ -> p_224601_ * 1181783497276652981L) ^ System.nanoTime();
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}
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public record Seed128bit(long seedLo, long seedHi) {
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public RandomSupport.Seed128bit xor(long p_288963_, long p_288992_) {
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return new RandomSupport.Seed128bit(this.seedLo ^ p_288963_, this.seedHi ^ p_288992_);
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}
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public RandomSupport.Seed128bit xor(RandomSupport.Seed128bit p_289009_) {
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return this.xor(p_289009_.seedLo, p_289009_.seedHi);
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}
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public RandomSupport.Seed128bit mixed() {
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return new RandomSupport.Seed128bit(RandomSupport.mixStafford13(this.seedLo), RandomSupport.mixStafford13(this.seedHi));
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}
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}
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}
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