46 lines
1.5 KiB
Java
46 lines
1.5 KiB
Java
package net.minecraft.world;
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import com.mojang.serialization.Codec;
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import com.mojang.serialization.codecs.RecordCodecBuilder;
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import java.util.Optional;
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import net.minecraft.resources.ResourceLocation;
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import net.minecraft.util.RandomSource;
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import net.minecraft.world.level.levelgen.RandomSupport;
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import net.minecraft.world.level.levelgen.XoroshiroRandomSource;
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public class RandomSequence {
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public static final Codec<RandomSequence> CODEC = RecordCodecBuilder.create(
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instance -> instance.group(XoroshiroRandomSource.CODEC.fieldOf("source").forGetter(randomSequence -> randomSequence.source))
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.apply(instance, RandomSequence::new)
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);
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private final XoroshiroRandomSource source;
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public RandomSequence(XoroshiroRandomSource source) {
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this.source = source;
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}
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public RandomSequence(long seed, ResourceLocation location) {
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this(createSequence(seed, Optional.of(location)));
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}
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public RandomSequence(long seed, Optional<ResourceLocation> location) {
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this(createSequence(seed, location));
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}
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private static XoroshiroRandomSource createSequence(long seed, Optional<ResourceLocation> location) {
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RandomSupport.Seed128bit seed128bit = RandomSupport.upgradeSeedTo128bitUnmixed(seed);
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if (location.isPresent()) {
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seed128bit = seed128bit.xor(seedForKey((ResourceLocation)location.get()));
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}
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return new XoroshiroRandomSource(seed128bit.mixed());
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}
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public static RandomSupport.Seed128bit seedForKey(ResourceLocation key) {
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return RandomSupport.seedFromHashOf(key.toString());
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}
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public RandomSource random() {
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return this.source;
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}
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}
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