cpp/openttd-patchpack/source Files · src/core/random_func.cpp

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Patric Stout

Fix #6468: don't store version of AIs-started-via-console in name

You can do: "startai myai.3", which starts version 3 of "myai".
This is very useful for testing save/load code between different
versions of your AI.

However, when using this syntax, the AI got saved as "myai.3" as
name of the AI, instead of "myai". This caused several problems,
like indicating to the user the AI could not be found, but still
load the AI. But in all cases, the AI never got the chance to
load the saved data, making the whole reason this exists pointless.

By splitting the name and version already in the console command,
the code becomes simpler and AIs started this way now follow the
normal flow after initialization.

/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file random_func.cpp Implementation of the pseudo random generator. */

#include "../stdafx.h"
#include "random_func.hpp"
#include "bitmath_func.hpp"

#ifdef RANDOM_DEBUG
#include "../network/network.h"
#include "../network/network_server.h"
#include "../network/network_internal.h"
#include "../company_func.h"
#include "../fileio_func.h"
#include "../date_func.h"
#endif /* RANDOM_DEBUG */

#include "../safeguards.h"

Randomizer _random, _interactive_random;

/**
 * Generate the next pseudo random number
 * @return the random number
 */
uint32 Randomizer::Next()
{
	const uint32 s = this->state[0];
	const uint32 t = this->state[1];

	this->state[0] = s + ROR(t ^ 0x1234567F, 7) + 1;
	return this->state[1] = ROR(s, 3) - 1;
}

/**
 * Generate the next pseudo random number scaled to \a limit, excluding \a limit
 * itself.
 * @param limit Limit of the range to be generated from.
 * @return Random number in [0,\a limit)
 */
uint32 Randomizer::Next(uint32 limit)
{
	return ((uint64)this->Next() * (uint64)limit) >> 32;
}

/**
 * (Re)set the state of the random number generator.
 * @param seed the new state
 */
void Randomizer::SetSeed(uint32 seed)
{
	this->state[0] = seed;
	this->state[1] = seed;
}

/**
 * (Re)set the state of the random number generators.
 * @param seed the new state
 */
void SetRandomSeed(uint32 seed)
{
	_random.SetSeed(seed);
	_interactive_random.SetSeed(seed * 0x1234567);
}

#ifdef RANDOM_DEBUG
uint32 DoRandom(int line, const char *file)
{
	if (_networking && (!_network_server || (NetworkClientSocket::IsValidID(0) && NetworkClientSocket::Get(0)->status != NetworkClientSocket::STATUS_INACTIVE))) {
		DEBUG(random, 0, "%08x; %02x; %04x; %02x; %s:%d", _date, _date_fract, _frame_counter, (byte)_current_company, file, line);
	}

	return _random.Next();
}

uint32 DoRandomRange(uint32 limit, int line, const char *file)
{
	return ((uint64)DoRandom(line, file) * (uint64)limit) >> 32;
}
#endif /* RANDOM_DEBUG */