mirror of
https://github.com/soypat/lneto.git
synced 2026-08-08 17:03:40 +00:00
soypat
20 lines
472 B
Go
20 lines
472 B
Go
package internal
|
|
|
|
// Prand16 generates a pseudo random number from a seed.
|
|
func Prand16(seed uint16) uint16 {
|
|
// 16bit Xorshift https://en.wikipedia.org/wiki/Xorshift
|
|
seed ^= seed << 7
|
|
seed ^= seed >> 9
|
|
seed ^= seed << 8
|
|
return seed
|
|
}
|
|
|
|
// Prand32 generates a pseudo random number from a seed.
|
|
func Prand32[T ~uint32](seed T) T {
|
|
/* Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs" */
|
|
seed ^= seed << 13
|
|
seed ^= seed >> 17
|
|
seed ^= seed << 5
|
|
return seed
|
|
}
|