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

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

r10062:9a719b26b56e 1.2 KiB text/x-c Show Annotation Show as Raw Download as Raw

rubidium

(svn r14229) -Feature: allow overriding the palette of the base GRFs. This way you can play with NewGRFs made for the Windows palette with the DOS palettes base GRFs (and vice versa). Note that for this to work correctly ALL NewGRFs must use the same palette; mix and match is not yet supported.

/* $Id$ */

/** @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 */