DBot/KStarbound
DBot/KStarbound
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More random generator compat with original engine

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This commit is contained in:
DBotThePony 2024-05-22 18:58:11 +07:00
parent 032f32626e
commit 96fdcccdd0
Signed by: DBot
GPG Key ID: DCC23B5715498507
1 changed files with 22 additions and 2 deletions
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24
src/main/kotlin/ru/dbotthepony/kstarbound/util/random/RandomUtils.kt
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@ -203,11 +203,31 @@ fun RandomGenerator.nextBytes(length: Int): ByteArray {
return data return data
} }
fun <T> Collection<T>.random(random: RandomGenerator): T { // for randomgen compat only
@Deprecated("Delicate API, use only when required for compatibility with original protocol")
fun RandomGenerator.randu64(): ULong {
val a = nextInt().toLong() and 0xFFFFFFFFL
val b = nextInt().toLong() and 0xFFFFFFFFL
return a.toULong().shl(32) or b.toULong()
}
// for randomgen compat only
@Deprecated("Delicate API, use only when required for compatibility with original protocol")
fun RandomGenerator.nextUInt(max: ULong): ULong {
val denom = ULong.MAX_VALUE / (max + 1UL)
return randu64() / denom
}
fun <T> Collection<T>.random(random: RandomGenerator, legacyCompatibleSelection: Boolean = false): T {
if (isEmpty()) if (isEmpty())
throw NoSuchElementException("List is empty") throw NoSuchElementException("List is empty")
return elementAt(random.nextInt(size)) if (legacyCompatibleSelection) {
// marvelous
return elementAt(random.nextUInt(size.toULong()).toInt())
} else {
return elementAt(random.nextInt(size))
}
} }
fun JsonArray.random(random: RandomGenerator): JsonElement { fun JsonArray.random(random: RandomGenerator): JsonElement {