From d9e34e7e70b827fd3037c3f8adac519e5c8845b3 Mon Sep 17 00:00:00 2001
From: Avril <flanchan@cumallover.me>
Date: Sat, 6 Nov 2021 00:02:26 +0000
Subject: [PATCH] Start: Seeding API
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Fortune for rngxx's current commit: Half curse − 半凶
---
 include/rngxx/internal/seed.h | 31 +++++++++++++++++++++++++++++++
 src/iter.cpp                  | 10 ----------
 src/seed.cpp                  | 13 +++++++++++++
 3 files changed, 44 insertions(+), 10 deletions(-)
 create mode 100644 include/rngxx/internal/seed.h
 delete mode 100644 src/iter.cpp
 create mode 100644 src/seed.cpp

diff --git a/include/rngxx/internal/seed.h b/include/rngxx/internal/seed.h
new file mode 100644
index 0000000..24a6711
--- /dev/null
+++ b/include/rngxx/internal/seed.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include "common.h"
+
+namespace rng
+{
+	template<typename T>
+	struct seed_gen
+	{
+		virtual T generate_seed() = 0;
+
+		inline virtual ~seed_gen(){}
+	};
+
+	namespace seed
+	{
+		typedef u64 sm128r[2];
+		struct sm128 {
+			sm128r m_raw;
+		};
+
+		struct splitmix64 : public virtual seed_gen<sm128>
+		{
+			splitmix64(u64 i);
+
+			sm128 generate_seed() override;
+		private:
+			sm128r m_state;
+		};
+	}
+}
diff --git a/src/iter.cpp b/src/iter.cpp
deleted file mode 100644
index 65d5824..0000000
--- a/src/iter.cpp
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <rngxx.hpp>
-
-//XXX: Doing this is not going to work ...
-#if 0
-void t(Random& r)
-{	
-	for(auto&& i : r.iter<int>()) (void)i;
-}
-#endif
-
diff --git a/src/seed.cpp b/src/seed.cpp
new file mode 100644
index 0000000..21537cf
--- /dev/null
+++ b/src/seed.cpp
@@ -0,0 +1,13 @@
+#include <seed.h>
+
+extern "C" {
+	// TODO: XXX: how to return a god damn array without typedef ffs????
+	extern u64 (*sm64_compute[2])(u64, u64);
+}
+
+namespace rng::seed
+{
+	splitmix64::splitmix64(u64 u) : m_state(sm64_compute(u, 0)){}
+
+	sm128 splitmix64::generate_seed() { return sm128 { m_state = sm64_compute(m_state[0], m_state[1]) }; }
+}