From 08cb1349ca394634c4e1df6cec423428e6b29ad6 Mon Sep 17 00:00:00 2001
From: copilot-swe-agent[bot]
Date: Fri, 20 Feb 2026 07:04:47 +0000
Subject: Add XorShift, SplitMix64, WyRandom, PCG, and XoroShiro generators

Co-authored-by: 8e8m <248551607+8e8m@users.noreply.github.com>
---
 source/pcg_random.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 source/pcg_random.h

(limited to 'source/pcg_random.h')

diff --git a/source/pcg_random.h b/source/pcg_random.h
new file mode 100644
index 0000000..ae4886a
--- /dev/null
+++ b/source/pcg_random.h
@@ -0,0 +1,52 @@
+/* MIT License - Copyright (c) 2025 wallstop
+ * Original C# implementation from: https://github.com/wallstop/unity-helpers
+ * Converted to C for librandom project
+ */
+
+#ifndef PCG_RANDOM_H
+#define PCG_RANDOM_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/* PCG (Permuted Congruential Generator): High-quality, small-state PRNG.
+ *
+ * PCG offers excellent statistical quality with very small state and extremely
+ * fast generation. This implementation uses a 64-bit state with 32-bit outputs
+ * and an increment (stream selector).
+ *
+ * Pros:
+ * - Fast and allocation-free; suitable for gameplay hot paths
+ * - Great statistical quality; passes TestU01 BigCrush and PractRand
+ * - Deterministic and reproducible across platforms
+ * - Small state footprint
+ *
+ * Cons:
+ * - Not cryptographically secure
+ * - 32-bit outputs (use multiple calls for 64-bit)
+ */
+
+typedef struct {
+    uint64_t state;
+    uint64_t increment;
+} pcg_random_t;
+
+/* Initialize the generator with a seed */
+void pcg_init(pcg_random_t *rng, uint64_t seed);
+
+/* Initialize with explicit state and increment */
+void pcg_init_full(pcg_random_t *rng, uint64_t state, uint64_t increment);
+
+/* Generate next random 32-bit unsigned integer */
+uint32_t pcg_next_uint(pcg_random_t *rng);
+
+/* Generate next random 64-bit unsigned integer */
+uint64_t pcg_next_ulong(pcg_random_t *rng);
+
+/* Generate next random float in [0, 1) */
+float pcg_next_float(pcg_random_t *rng);
+
+/* Generate next random double in [0, 1) */
+double pcg_next_double(pcg_random_t *rng);
+
+#endif /* PCG_RANDOM_H */
-- 
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