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[orx-noise] Replace hash functions

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This commit is contained in:
Edwin Jakobs
2024-10-19 17:01:12 +02:00
parent 8a18546ef1
commit 86907936af
10 changed files with 181 additions and 126 deletions
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80
orx-noise/src/commonMain/kotlin/GradCoord.kt
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@@ -20,43 +20,24 @@ private val GRAD_3D = arrayOf(
Vector3(1.0, 1.0, 0.0), Vector3(0.0, -1.0, 1.0), Vector3(-1.0, 1.0, 0.0), Vector3(0.0, -1.0, -1.0))
fun gradCoord2D(seed: Int, x: Int, y: Int, xd: Double, yd: Double): Double {
var hash = seed
hash = hash xor X_PRIME * x
hash = hash xor Y_PRIME * y
val hash = uhash2D(seed, x, y)
hash = hash * hash * hash * 60493
hash = hash shr 13 xor hash
val (x1, y1) = GRAD_2D[hash and 7]
val (x1, y1) = GRAD_2D[(hash and 7U).toInt()]
return xd * x1 + yd * y1
}
fun gradCoord3D(seed: Int, x: Int, y: Int, z: Int, xd: Double, yd: Double, zd: Double): Double {
var hash = seed
hash = hash xor X_PRIME * x
hash = hash xor Y_PRIME * y
hash = hash xor Z_PRIME * z
val hash = uhash3D(seed, x, y, z)
hash *= hash * hash * 60493
hash = hash shr 13 xor hash
val g = GRAD_3D[hash and 15]
val g = GRAD_3D[(hash and 15U).toInt()]
return xd * g.x + yd * g.y + zd * g.z
}
fun gradCoord4D(seed: Int, x: Int, y: Int, z: Int, w: Int, xd: Double, yd: Double, zd: Double, wd: Double): Double {
var hash = seed
hash = hash xor X_PRIME * x
hash = hash xor Y_PRIME * y
hash = hash xor Z_PRIME * z
hash = hash xor W_PRIME * w
val hash = (uhash4D(seed, x, y, z, w) and 31U).toInt()
hash = hash * hash * hash * 60493
hash = hash shr 13 xor hash
hash = hash and 31
var a = yd
var b = zd
var c = wd // X,Y,Z
@@ -83,57 +64,6 @@ fun gradCoord4D(seed: Int, x: Int, y: Int, z: Int, w: Int, xd: Double, yd: Doubl
return (if (hash and 4 == 0) -a else a) + (if (hash and 2 == 0) -b else b) + if (hash and 1 == 0) -c else c
}
fun hash2D(seed: Int, x: Int, y: Int): Int {
var hash = seed
hash = hash xor X_PRIME * x
hash = hash xor Y_PRIME * y
hash = hash * hash * hash * 60493
hash = hash shr 13 xor hash
return hash
}
fun hash3D(seed: Int, x: Int, y: Int, z: Int): Int {
var hash = seed
hash = hash xor X_PRIME * x
hash = hash xor Y_PRIME * y
hash = hash xor Z_PRIME * z
hash = hash * hash * hash * 60493
hash = hash shr 13 xor hash
return hash
}
fun hash4D(seed: Int, x: Int, y: Int, z: Int, w: Int): Int {
var hash = seed
hash = hash xor X_PRIME * x
hash = hash xor Y_PRIME * y
hash = hash xor Z_PRIME * z
hash = hash xor W_PRIME * w
hash = hash * hash * hash * 60493
hash = hash shr 13 xor hash
return hash
}
fun valCoord1D(seed: Int, x: Int): Double {
var n = seed
n = n xor X_PRIME * x
return n * n * n * 60493 / 2147483648.0
}
fun valCoord2D(seed: Int, x: Int, y: Int): Double {
var n = seed
n = n xor X_PRIME * x
n = n xor Y_PRIME * y
return n * n * n * 60493 / 2147483648.0
}
fun valCoord3D(seed: Int, x: Int, y: Int, z: Int): Double {
var n = seed
n = n xor X_PRIME * x