Merge pull request #27171 from Chaosus/randfix

Properly setup seed in RNG

1 files changed, 10 insertions, 0 deletions

diff --git a/thirdparty/misc/pcg.cpp b/thirdparty/misc/pcg.cpp
index eac3b36d36..c421e16f89 100644
--- a/thirdparty/misc/pcg.cpp
+++ b/thirdparty/misc/pcg.cpp
@@ -13,3 +13,13 @@ uint32_t pcg32_random_r(pcg32_random_t* rng)
     uint32_t rot = oldstate >> 59u;
     return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
 }
+
+// Source from http://www.pcg-random.org/downloads/pcg-c-basic-0.9.zip
+void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate, uint64_t initseq)
+{
+    rng->state = 0U;
+    rng->inc = (initseq << 1u) | 1u;
+    pcg32_random_r(rng);
+    rng->state += initstate;
+    pcg32_random_r(rng);
+}