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

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

r9583:b6e25a00b908 1.2 KiB text/x-c Show Annotation Show as Raw Download as Raw

rubidium

(svn r13621) -Fix: building roadbits in the wrong direction on bridges or building roadbits from underneath the bridge to the bridgehead is impossible, so don't silently ignore that error when building over houses and industries is not ignored.

/* $Id$ */

/** @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_data.h"
#include "../variables.h" /* _frame_counter */
#include "../player_func.h"

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