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

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PeterN

Feature: Industries with neutral stations (e.g. Oil Rig) only supply/accept cargo to/from their neutral station. (#7234)

This change is a controlled by a game setting, located under Environment ->
Industries which allows toggling the behaviour. It defaults to enabled.

"Company stations can serve industries with attached neutral stations"

When enabled, industries with attached neutral station (such as Oil Rigs) may
also be served by company-owned stations built nearby. This is the traditional
behaviour.

When disabled, these industries may only be served by their neutral station.
Any nearby company-owned stations won't be able to serve them, nor will the
neutral station serve anything else other than the industry.

/* $Id$ */

/*
 * 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 */