WIP Background

src/values/MyRand.cpp

@@ -0,0 +1,25 @@
+#include <inttypes.h>
+
+static uint32_t rprand_state[4] = {0};
+
+static inline uint32_t my_rotate_left(const uint32_t x, int k)
+{
+  return (x << k) | (x >> (32 - k));
+}
+
+uint32_t my_rprand_xoshiro(void)
+{
+  const uint32_t result = my_rotate_left(rprand_state[1] * 5, 7) * 9;
+  const uint32_t t = rprand_state[1] << 9;
+
+  rprand_state[2] ^= rprand_state[0];
+  rprand_state[3] ^= rprand_state[1];
+  rprand_state[1] ^= rprand_state[2];
+  rprand_state[0] ^= rprand_state[3];
+
+  rprand_state[2] ^= t;
+
+  rprand_state[3] = my_rotate_left(rprand_state[3], 11);
+
+  return result;
+}