curioustorvald/Terrarum
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faster block tiling hash

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minjaesong
2025-10-13 20:08:22 +09:00
parent 99bd56317d
commit 767aa09a17
3 changed files with 54 additions and 9 deletions
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19
src/net/torvald/terrarum/Point2d.kt
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@@ -1,6 +1,7 @@
package net.torvald.terrarum
import net.torvald.random.XXHash32
import net.torvald.terrarum.gameworld.fmod
import org.dyn4j.geometry.Vector2
/**
@@ -118,7 +119,7 @@ class Point2i() {
return this
}
override fun hashCode(): Int = XXHash32.hashGeoCoord(x, y)
override fun hashCode(): Int = getHashCoord(x, y)
override fun equals(other: Any?) = if (other is Point2i)
this.x == other.x && this.y == other.y
else
@@ -130,4 +131,20 @@ class Point2i() {
operator fun component2() = y
fun toVector() = Vector2(this.x.toDouble(), this.y.toDouble())
companion object {
private fun tavGrainSynthesisRNG(frame: Int, band: Int, x: Int, y: Int): Int {
var hash = frame * 0x9e3779b9.toInt() xor band * 0x7f4a7c15 xor (y shl 16) xor x
hash = hash xor (hash shr 16)
hash = hash * 0x7feb352d
hash = hash xor (hash shr 15)
hash = hash * 0x846ca68b.toInt()
hash = hash xor (hash shr 16)
return hash
}
private fun getHashCoord(x: Int, y: Int): Int {
return tavGrainSynthesisRNG(31, 65003, x, y)
}
}
}