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/* $Id$ */

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

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#include "../stdafx.h"

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#include "random_func.hpp"

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#include "bitmath_func.hpp"

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Randomizer _random, _interactive_random;

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uint32 Randomizer::Next()

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{

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	const uint32 s = this->state[0];

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	const uint32 t = this->state[1];

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	this->state[0] = s + ROR(t ^ 0x1234567F, 7) + 1;

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	return this->state[1] = ROR(s, 3) - 1;

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}

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uint32 Randomizer::Next(uint16 max)

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{

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	return GB(this->Next(), 0, 16) * max >> 16;

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}

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void Randomizer::SetSeed(uint32 seed)

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{

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	this->state[0] = seed;

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	this->state[1] = seed;

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}

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void SetRandomSeed(uint32 seed)

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{

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	_random.SetSeed(seed);

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	_interactive_random.SetSeed(seed * 0x1234567);

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}

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#ifdef RANDOM_DEBUG

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#include "../network/network_data.h"

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#include "../variables.h" /* _frame_counter */

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#include "../player_func.h"

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uint32 DoRandom(int line, const char *file)

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{

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	if (_networking && (DEREF_CLIENT(0)->status != STATUS_INACTIVE || !_network_server)) {

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		printf("Random [%d/%d] %s:%d\n",_frame_counter, (byte)_current_player, file, line);

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	}

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	return _random.Next();

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}

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uint DoRandomRange(uint max, int line, const char *file)

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{

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	return GB(DoRandom(line, file), 0, 16) * max >> 16;

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}

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#endif /* RANDOM_DEBUG */