DBot/overdrive_that_matters
DBot/overdrive_that_matters
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Provide better random seeds for random number generators

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This commit is contained in:
DBotThePony 2025-03-05 09:08:33 +07:00
parent 49f76c7bdd
commit f19804dd4a
Signed by: DBot
GPG Key ID: DCC23B5715498507
3 changed files with 8 additions and 3 deletions
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3
src/main/kotlin/ru/dbotthepony/mc/otm/core/util/CMWCRandom.kt
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@ -4,10 +4,11 @@ import net.minecraft.util.Mth
import net.minecraft.util.RandomSource
import net.minecraft.world.level.levelgen.MarsagliaPolarGaussian
import net.minecraft.world.level.levelgen.PositionalRandomFactory
import net.minecraft.world.level.levelgen.RandomSupport
import java.lang.StringBuilder
import java.util.random.RandomGenerator
class CMWCRandom(seed: Long = System.nanoTime()) : RandomGenerator, RandomSource {
class CMWCRandom(seed: Long = RandomSupport.generateUniqueSeed()) : RandomGenerator, RandomSource {
private val state = IntArray(CMWC_STATE_SIZE)
private var carry = 0
private var stateIndex = 0

3
src/main/kotlin/ru/dbotthepony/mc/otm/core/util/LCG64Random.kt
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@ -4,13 +4,14 @@ import net.minecraft.util.Mth
import net.minecraft.util.RandomSource
import net.minecraft.world.level.levelgen.MarsagliaPolarGaussian
import net.minecraft.world.level.levelgen.PositionalRandomFactory
import net.minecraft.world.level.levelgen.RandomSupport
import java.lang.StringBuilder
import java.util.random.RandomGenerator
// different from LegacyRandomSource minecraft uses in meaning that this class use different constants
// and always use upper 32 bits instead of implementing BitRandomSource
// AND it uses all bits from provided seed
class LCG64Random(private var seed: Long = System.nanoTime()) : RandomGenerator, RandomSource {
class LCG64Random(private var seed: Long = RandomSupport.generateUniqueSeed()) : RandomGenerator, RandomSource {
private val gaussian = MarsagliaPolarGaussian(this)
override fun setSeed(seed: Long) {

5
src/main/kotlin/ru/dbotthepony/mc/otm/core/util/Xoshiro256SSRandom.kt
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@ -5,6 +5,7 @@ import net.minecraft.util.Mth
import net.minecraft.util.RandomSource
import net.minecraft.world.level.levelgen.MarsagliaPolarGaussian
import net.minecraft.world.level.levelgen.PositionalRandomFactory
import net.minecraft.world.level.levelgen.RandomSupport
import java.lang.StringBuilder
import java.util.random.RandomGenerator
@ -16,10 +17,12 @@ class Xoshiro256SSRandom(
) : RandomGenerator, RandomSource {
private val gaussian = MarsagliaPolarGaussian(this)
constructor(seed: Long = System.nanoTime()) : this(1L, 2L, 3L, 4L) {
constructor(seed: Long) : this(1L, 2L, 3L, 4L) {
setSeed(seed)
}
constructor() : this(RandomSupport.generateUniqueSeed(), RandomSupport.generateUniqueSeed(), RandomSupport.generateUniqueSeed(), RandomSupport.generateUniqueSeed())
override fun setSeed(seed: Long) {
val rng = LCG64Random(seed)
s0 = rng.nextLong()