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#include "platform.h"
#include <string.h>
#include <math.h>
#include <iosfwd>
#include <iostream>
#include <ios>
#include <streambuf>
#include <istream>
#include <ostream>
#include <iomanip>
#include <sstream>
#include <cstdlib>
#include <fstream>
#include <zlib.h>
#include "svector.h"
using std::string;
#include "endian.h"
#include "files.h"
#include "enabler.h"
#include "textlines.h"
#include "basics.h"
#include "random.h"
extern int32_t basic_seed;
extern int mt_index[MT_BUFFER_NUM];
extern short mt_cur_buffer;
extern short mt_virtual_buffer;
extern uint32_t mt_buffer[MT_BUFFER_NUM][MT_LEN];
//public domain RNG stuff by Michael Brundage
//with some modifications by me to handle more buffers
void mt_init()
{
mt_cur_buffer=0;
mt_virtual_buffer=0;
mt_buffer[0][0]=GetTickCount();
int i;
for(i=1;i<MT_LEN;i++)
{
//2010: better init line from wikipedia, ultimate source unknown
mt_buffer[0][i]=1812433253UL * (mt_buffer[0][i-1] ^ (mt_buffer[0][i-1]>>30)) + i;
}
mt_index[0]=MT_LEN*sizeof(uint32_t);
int32_t j;
for(j=0;j<20;j++)trandom_twist();
}
#define MT_IA 397
#define MT_IB (MT_LEN - MT_IA)
#define UPPER_MASK 0x80000000
#define LOWER_MASK 0x7FFFFFFF
#define MATRIX_A 0x9908B0DF
#define TWIST(b,i,j) ((b)[i] & UPPER_MASK) | ((b)[j] & LOWER_MASK)
#define MAGIC(s) (((s)&1)*MATRIX_A)
uint32_t mt_trandom()
{
uint32_t * b = mt_buffer[mt_cur_buffer];
int idx = mt_index[mt_cur_buffer];
uint32_t s;
int i;
if (idx == MT_LEN*sizeof(uint32_t))
{
idx = 0;
i = 0;
for (; i < MT_IB; i++) {
s = TWIST(b, i, i+1);
b[i] = b[i + MT_IA] ^ (s >> 1) ^ MAGIC(s);
}
for (; i < MT_LEN-1; i++) {
s = TWIST(b, i, i+1);
b[i] = b[i - MT_IB] ^ (s >> 1) ^ MAGIC(s);
}
s = TWIST(b, MT_LEN-1, 0);
b[MT_LEN-1] = b[MT_IA-1] ^ (s >> 1) ^ MAGIC(s);
}
mt_index[mt_cur_buffer] = idx + sizeof(uint32_t);
return *(uint32_t *)((unsigned char *)b + idx);
}
void trandom_twist()
{
uint32_t * b = mt_buffer[mt_cur_buffer];
uint32_t s;
int i;
i = 0;
for (; i < MT_IB; i++) {
s = TWIST(b, i, i+1);
b[i] = b[i + MT_IA] ^ (s >> 1) ^ MAGIC(s);
}
for (; i < MT_LEN-1; i++) {
s = TWIST(b, i, i+1);
b[i] = b[i - MT_IB] ^ (s >> 1) ^ MAGIC(s);
}
s = TWIST(b, MT_LEN-1, 0);
b[MT_LEN-1] = b[MT_IA-1] ^ (s >> 1) ^ MAGIC(s);
}
//back to my crap - tarn
void pop_trandom_uniform_seed()
{
if(mt_virtual_buffer>0)mt_virtual_buffer--;
mt_cur_buffer=mt_virtual_buffer;
if(mt_cur_buffer>=MT_BUFFER_NUM)mt_cur_buffer=MT_BUFFER_NUM-1;
}
void push_trandom_uniform_seed(uint32_t newseed)
{
mt_virtual_buffer++;
mt_cur_buffer=mt_virtual_buffer;
if(mt_cur_buffer>=MT_BUFFER_NUM)
{
mt_cur_buffer=MT_BUFFER_NUM-1;
errorlog_string("Random Buffer Overload");
}
short i;
uint32_t * b = mt_buffer[mt_cur_buffer];
b[0]=newseed;
for(i=1;i<MT_LEN;i++)
{
//2010: better init line from wikipedia, ultimate source unknown
b[i]=1812433253UL * (b[i-1] ^ (b[i-1]>>30)) + i;
}
mt_index[mt_cur_buffer]=MT_LEN*sizeof(uint32_t);
trandom_twist();
}
void push_trandom_double_seed(uint32_t newseed1,uint32_t newseed2)
{
mt_virtual_buffer++;
mt_cur_buffer=mt_virtual_buffer;
if(mt_cur_buffer>=MT_BUFFER_NUM)
{
mt_cur_buffer=MT_BUFFER_NUM-1;
errorlog_string("Random Buffer Overload");
}
short i;
uint32_t * b = mt_buffer[mt_cur_buffer];
b[0]=newseed1/2+newseed2/2;
for(i=1;i<MT_LEN;i++)
{
b[i]=1812433253UL * (b[i-1] ^ (b[i-1]>>30)) + i;
}
mt_index[mt_cur_buffer]=MT_LEN*sizeof(uint32_t);
trandom_twist();
}
void push_trandom_triple_seed(uint32_t newseed1,uint32_t newseed2,uint32_t newseed3)
{
mt_virtual_buffer++;
mt_cur_buffer=mt_virtual_buffer;
if(mt_cur_buffer>=MT_BUFFER_NUM)
{
mt_cur_buffer=MT_BUFFER_NUM-1;
errorlog_string("Random Buffer Overload");
}
short i;
uint32_t * b = mt_buffer[mt_cur_buffer];
b[0]=newseed1/3+newseed2/3+newseed3/3;
for(i=1;i<MT_LEN;i++)
{
b[i]=1812433253UL * (b[i-1] ^ (b[i-1]>>30)) + i;
}
mt_index[mt_cur_buffer]=MT_LEN*sizeof(uint32_t);
trandom_twist();
}
//picks a random number from 0 to max-1
int32_t basic_random(int32_t max)
{
r_num();
return (int32_t)((uint32_t)basic_seed/((1073741824UL/(uint32_t)max)+1UL));
}
//sets seed to a random number from 0 to 1 billion
void r_num()
{
basic_seed=(int32_t)(((uint32_t)basic_seed*907725UL+99979777UL)%1073741824UL);
}
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