add new rng

the plan is to have random_new::generator which can be a rng_synced or not dependng on whether we are in a synced context (for example select events are no synced context)

this commit is part of pr 121.

src/CMakeLists.txt

@@ -844,7 +844,11 @@ set(wesnoth-main_SRC
 	playsingle_controller.cpp
 	playturn.cpp
 	portrait.cpp
+	random_new.cpp
+	random_new_deterministic.cpp
+	random_new_synced.cpp
 	replay.cpp
+	replay_helper.cpp
 	replay_controller.cpp
 	resources.cpp
 	save_blocker.cpp

src/SConscript

@@ -478,7 +478,10 @@ wesnoth_sources = Split("""
     playsingle_controller.cpp
     playturn.cpp
     portrait.cpp
-    replay.cpp
+	random_new.cpp
+	random_new_deterministic.cpp
+	random_new_synced.cpp
+	replay.cpp
     replay_controller.cpp
     resources.cpp
     save_blocker.cpp

src/random_new.cpp

@@ -0,0 +1,61 @@
+/*
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+#include "random_new.hpp"
+#include "log.hpp"
+
+
+
+#include <stdlib.h>
+static lg::log_domain log_random("random");
+#define DBG_RND LOG_STREAM(debug, log_random)
+#define LOG_RND LOG_STREAM(info, log_random)
+#define WRN_RND LOG_STREAM(warn, log_random)
+#define ERR_RND LOG_STREAM(err, log_random)
+
+namespace random_new
+{
+	rng* generator = new rng();
+
+	rng::rng()
+		: random_calls_(0)
+	{
+
+	}
+
+	rng::~rng()
+	{
+
+	}
+	
+	unsigned int rng::get_random_calls()
+	{
+		return random_calls_;
+	}
+
+	int rng::next_random()
+	{
+		random_calls_++;
+		return next_random_impl();
+	}
+
+	int rng::next_random_impl()
+	{
+		//getting here means random was called form outsiude a synced context.
+		int retv = rand();
+		
+		LOG_RND << "random_new::rng::next_random returned " << retv;
+		return retv;
+	}
+
+}

src/random_new.hpp

@@ -0,0 +1,37 @@
+/*
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+#ifndef RANDOM_NEW_H_INCLUDED
+#define RANDOM_NEW_H_INCLUDED
+
+namespace random_new
+{
+	//this class does NOT give synced random results.
+	class rng
+	{
+	public:
+		rng();
+		int next_random();
+		virtual ~rng();
+		unsigned int get_random_calls();
+	protected:
+		virtual int next_random_impl();
+		unsigned int random_calls_;
+	};
+
+	// this generator is autmatilcy synced during synced context.
+	// calling this should automaticly clear the undo stack.
+	// 
+	extern rng* generator;
+	
+}
+#endif

src/random_new_deterministic.cpp

@@ -0,0 +1,46 @@
+/*
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+#include "random_new_deterministic.hpp"
+
+
+namespace random_new
+{
+	
+	rng_deterministic::rng_deterministic(rand_rng::simple_rng& gen)
+		: generator_(gen)
+	{
+
+	}
+	
+	rng_deterministic::~rng_deterministic()
+	{
+
+	}
+
+	int rng_deterministic::next_random_impl()
+	{
+		return generator_.get_next_random();
+	}
+
+
+	set_random_determinstic::set_random_determinstic(rand_rng::simple_rng& rng)
+		: old_rng_(generator), new_rng_(rng)
+	{
+		generator = &new_rng_;
+	}
+
+	set_random_determinstic::~set_random_determinstic()
+	{
+		generator = old_rng_;
+	}
+}

src/random_new_deterministic.hpp

@@ -0,0 +1,49 @@
+/*
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+#ifndef RANDOM_NEW_DETERMINISTIC_H_INCLUDED
+#define RANDOM_NEW_DETERMINISTIC_H_INCLUDED
+#include "random_new.hpp"
+#include "simple_rng.hpp"
+
+namespace random_new
+{
+	/*
+		this is the determinstic random class, it behaves similar to the old random class.
+		it's only application is at the very start of the scneario.
+
+		or durign the "Deterministic SP mode"
+	*/
+	class rng_deterministic : public random_new::rng
+	{
+	public:
+		rng_deterministic(rand_rng::simple_rng& gen);
+		virtual ~rng_deterministic();
+	protected:
+		virtual int next_random_impl();
+	private:
+		rand_rng::simple_rng& generator_;
+	};
+
+	//RAII class
+	class set_random_determinstic
+	{
+	public:
+		set_random_determinstic(rand_rng::simple_rng& rng);
+		~set_random_determinstic();
+	private :
+		rng* old_rng_;
+		rng_deterministic new_rng_;
+	};
+}
+
+#endif

src/random_new_synced.cpp

@@ -0,0 +1,52 @@
+/*
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+#include "random_new_synced.hpp"
+#include "log.hpp"
+
+static lg::log_domain log_random("random");
+#define DBG_RND LOG_STREAM(debug, log_random)
+#define LOG_RND LOG_STREAM(info, log_random)
+#define WRN_RND LOG_STREAM(warn, log_random)
+#define ERR_RND LOG_STREAM(err, log_random)
+
+namespace random_new
+{
+	synced_rng::synced_rng(boost::function0<int> seed_generator)
+		: has_valid_seed_(false), seed_generator_(seed_generator), gen_()
+	{
+	}
+	int synced_rng::next_random_impl()
+	{
+		if(!has_valid_seed_)
+		{
+			initialize();
+		}
+		//getting here means random was called form inside a synced context.
+		int retv = gen_.get_next_random();
+		
+		LOG_RND << "random_new::rng::next_random_impl returned " << retv;
+		return retv;
+	}
+	
+	void synced_rng::initialize()
+	{
+		int new_seed = seed_generator_();
+		gen_.seed_random(new_seed, 0);
+		has_valid_seed_ = true;
+	}
+
+	synced_rng::~synced_rng()
+	{
+
+	}
+}

src/random_new_synced.hpp

@@ -0,0 +1,45 @@
+/*
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+#ifndef RANDOM_NEW_SYNCED_H_INCLUDED
+#define RANDOM_NEW_SYNCED_H_INCLUDED
+
+
+
+#include "random_new.hpp"
+#include "simple_rng.hpp"
+
+#include <boost/function.hpp>
+
+
+/*
+todo: use a boost::random based solution.
+*/
+namespace random_new
+{
+	class synced_rng : public random_new::rng
+	{
+	public:
+		synced_rng(boost::function0<int> seed_generator);
+		virtual ~synced_rng();
+	protected:
+		virtual int next_random_impl();
+	private:
+		void initialize();
+		bool has_valid_seed_;
+		boost::function0<int> seed_generator_; 
+		//TODO: replayce this by boost::random::mt19937 or similar
+		rand_rng::simple_rng gen_;
+	};
+}
+#endif