Add XorShift, SplitMix64, WyRandom, PCG, and XoroShiro generators

Co-authored-by: 8e8m <248551607+8e8m@users.noreply.github.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/source/splitmix64.h b/source/splitmix64.h
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+++ b/source/splitmix64.h
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+/* MIT License - Copyright (c) 2025 wallstop
+ * Original C# implementation from: https://github.com/wallstop/unity-helpers
+ * Converted to C for librandom project
+ */
+
+#ifndef SPLITMIX64_H
+#define SPLITMIX64_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/* SplitMix64: A fast 64-bit generator often used as a high-quality seeding/mixing PRNG.
+ *
+ * SplitMix64 is widely used to quickly generate well-distributed 64-bit values
+ * and as a seed source for other generators.
+ *
+ * Pros:
+ * - Very fast; great as a hash/mixer and for seed generation
+ * - Deterministic, portable, and simple
+ *
+ * Cons:
+ * - Not cryptographically secure
+ */
+
+typedef struct {
+    uint64_t state;
+} splitmix64_t;
+
+/* Initialize the generator with a seed */
+void splitmix64_init(splitmix64_t *rng, uint64_t seed);
+
+/* Generate next random 32-bit unsigned integer */
+uint32_t splitmix64_next_uint(splitmix64_t *rng);
+
+/* Generate next random 64-bit unsigned integer */
+uint64_t splitmix64_next_ulong(splitmix64_t *rng);
+
+/* Generate next random float in [0, 1) */
+float splitmix64_next_float(splitmix64_t *rng);
+
+/* Generate next random double in [0, 1) */
+double splitmix64_next_double(splitmix64_t *rng);
+
+#endif /* SPLITMIX64_H */