# random_func.cpp

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    00001 /* $Id: random_func.cpp 14910 2009-01-08 13:57:50Z rubidium $ */
    00002
    00005 #include "../stdafx.h"
    00006 #include "random_func.hpp"
    00007 #include "bitmath_func.hpp"
    00008
    00009 Randomizer _random, _interactive_random;
    00010
    00011 uint32 Randomizer::Next()
    00012 {
    00013   const uint32 s = this->state[0];
    00014   const uint32 t = this->state[1];
    00015
    00016   this->state[0] = s + ROR(t ^ 0x1234567F, 7) + 1;
    00017   return this->state[1] = ROR(s, 3) - 1;
    00018 }
    00019
    00020 uint32 Randomizer::Next(uint16 max)
    00021 {
    00022   return GB(this->Next(), 0, 16) * max >> 16;
    00023 }
    00024
    00025 void Randomizer::SetSeed(uint32 seed)
    00026 {
    00027   this->state[0] = seed;
    00028   this->state[1] = seed;
    00029 }
    00030
    00031 void SetRandomSeed(uint32 seed)
    00032 {
    00033   _random.SetSeed(seed);
    00034   _interactive_random.SetSeed(seed * 0x1234567);
    00035 }
    00036
    00037 #ifdef RANDOM_DEBUG
    00038 #include "../network/network_internal.h"
    00039 #include "../company_func.h"
    00040
    00041 uint32 DoRandom(int line, const char *file)
    00042 {
    00043   if (_networking && (GetNetworkClientSocket(0)->status != STATUS_INACTIVE || !_network_server)) {
    00044     printf("Random [%d/%d] %s:%d\n", _frame_counter, (byte)_current_company, file, line);
    00045   }
    00046
    00047   return _random.Next();
    00048 }
    00049
    00050 uint DoRandomRange(uint max, int line, const char *file)
    00051 {
    00052   return GB(DoRandom(line, file), 0, 16) * max >> 16;
    00053 }
    00054 #endif /* RANDOM_DEBUG */