a splitmix64 seeder for hydra

Author: AAAlvesJr

hydra/SeedRNG.h

@@ -0,0 +1,91 @@
+/*----------------------------------------------------------------------------
+ *
+ *   Copyright (C) 2016 - 2020 Antonio Augusto Alves Junior
+ *
+ *   This file is part of Hydra Data Analysis Framework.
+ *
+ *   Hydra is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Hydra is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Hydra.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *---------------------------------------------------------------------------*/
+
+/*
+ * SeedRNG.h
+ *
+ *  Created on: 30/06/2020
+ *      Author: Antonio Augusto Alves Junior
+ */
+
+#ifndef SEEDRNG_H_
+#define SEEDRNG_H_
+
+
+#include <hydra/detail/Config.h>
+#include <stdint.h>
+
+
+namespace hydra {
+
+class SeedRNG
+{
+public:
+
+	 __hydra_host__ __hydra_device__
+	 SeedRNG(size_t state=1337 ):
+	fState(state)
+	{}
+
+	 __hydra_host__ __hydra_device__
+	 SeedRNG(SeedRNG const& other):
+	fState(other.GetState())
+	{}
+
+	 __hydra_host__ __hydra_device__
+	 inline SeetRNG& operator=(SeedRNG const& other)
+	{
+		if(this==&other) return *this;
+
+		fState=other.GetState();
+
+		return *this;
+	}
+
+	 __hydra_host__ __hydra_device__
+	size_t GetState() const {
+		return fState;
+	}
+
+	__hydra_host__ __hydra_device__
+	void SetState(size_t state) {
+		fState = state;
+	}
+
+	__hydra_host__ __hydra_device__
+	size_t operator()()
+	{
+		size_t z = (fState += 0x9e3779b97f4a7c15);
+		z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
+		z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
+		return z ^ (z >> 31);
+	}
+
+
+private:
+
+	size_t fState;
+
+};
+
+}  // namespace hydra
+
+#endif /* SEEDRNG_H_ */