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

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Location: cpp/openttd-patchpack/source/src/core/random_func.cpp

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peter1138

(svn r15389) -Feature: Add ability to select which base graphics set is used from the Game Options window. The change takes effect when the window is closed. This option can only be used from the intro menu, as reloading graphics during a game may cause issues.

/* $Id$ */

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

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

Randomizer _random, _interactive_random;

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;
}

uint32 Randomizer::Next(uint16 max)
{
	return GB(this->Next(), 0, 16) * max >> 16;
}

void Randomizer::SetSeed(uint32 seed)
{
	this->state[0] = seed;
	this->state[1] = seed;
}

void SetRandomSeed(uint32 seed)
{
	_random.SetSeed(seed);
	_interactive_random.SetSeed(seed * 0x1234567);
}

#ifdef RANDOM_DEBUG
#include "../network/network_internal.h"
#include "../company_func.h"

uint32 DoRandom(int line, const char *file)
{
	if (_networking && (GetNetworkClientSocket(0)->status != STATUS_INACTIVE || !_network_server)) {
		printf("Random [%d/%d] %s:%d\n", _frame_counter, (byte)_current_company, file, line);
	}

	return _random.Next();
}

uint DoRandomRange(uint max, int line, const char *file)
{
	return GB(DoRandom(line, file), 0, 16) * max >> 16;
}
#endif /* RANDOM_DEBUG */