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

Files @ r12162:c4894f5339c3

Branch filter:

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

r12162:c4894f5339c3 1.2 KiB text/x-c Show Annotation Show as Raw Download as Raw

rubidium

(svn r16583) -Update: the order of the language files so it's in sync with english.txt. Normally WT2 would do this, but only with activity for those languages. Now we'd like to the order to match so we can more easily spot import bugs while developing WT3.

/* $Id$ */

/** @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 && (!_network_server || (NetworkClientSocket::IsValidID(0) && NetworkClientSocket::Get(0)->status != STATUS_INACTIVE))) {
		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 */