skidd13@7935: /* $Id$ */
skidd13@7935: 
rubidium@9111: /** @file random_func.cpp Implementation of the pseudo random generator. */
skidd13@7935: 
skidd13@7935: #include "../stdafx.h"
skidd13@7935: #include "random_func.hpp"
rubidium@8113: #include "bitmath_func.hpp"
skidd13@7935: 
rubidium@8434: Randomizer _random, _interactive_random;
rubidium@8142: 
rubidium@8434: uint32 Randomizer::Next()
skidd13@7935: {
rubidium@8434: 	const uint32 s = this->state[0];
rubidium@8434: 	const uint32 t = this->state[1];
skidd13@7935: 
rubidium@8434: 	this->state[0] = s + ROR(t ^ 0x1234567F, 7) + 1;
rubidium@8434: 	return this->state[1] = ROR(s, 3) - 1;
skidd13@7935: }
skidd13@7935: 
rubidium@8434: uint32 Randomizer::Next(uint16 max)
skidd13@7935: {
rubidium@8434: 	return GB(this->Next(), 0, 16) * max >> 16;
rubidium@8434: }
rubidium@8434: 
rubidium@8434: void Randomizer::SetSeed(uint32 seed)
rubidium@8434: {
rubidium@8434: 	this->state[0] = seed;
rubidium@8434: 	this->state[1] = seed;
skidd13@7935: }
skidd13@7935: 
skidd13@7935: void SetRandomSeed(uint32 seed)
skidd13@7935: {
rubidium@8434: 	_random.SetSeed(seed);
rubidium@8434: 	_interactive_random.SetSeed(seed * 0x1234567);
skidd13@7935: }
skidd13@7935: 
skidd13@7935: #ifdef RANDOM_DEBUG
rubidium@8079: #include "../network/network_data.h"
rubidium@8477: #include "../variables.h" /* _frame_counter */
rubidium@8477: #include "../player_func.h"
rubidium@8477: 
skidd13@7935: uint32 DoRandom(int line, const char *file)
skidd13@7935: {
rubidium@8434: 	if (_networking && (DEREF_CLIENT(0)->status != STATUS_INACTIVE || !_network_server)) {
skidd13@7935: 		printf("Random [%d/%d] %s:%d\n",_frame_counter, (byte)_current_player, file, line);
rubidium@8434: 	}
rubidium@8434: 
rubidium@8477: 	return _random.Next();
rubidium@8434: }
skidd13@7935: 
skidd13@7935: uint DoRandomRange(uint max, int line, const char *file)
skidd13@7935: {
skidd13@7935: 	return GB(DoRandom(line, file), 0, 16) * max >> 16;
skidd13@7935: }
skidd13@8792: #endif /* RANDOM_DEBUG */