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//~ Libraries
#include "libs/lr/lr.h"
PUSH_WARNINGS
#define STB_SPRINTF_IMPLEMENTATION
#include "libs/stb_sprintf.h"
POP_WARNINGS
#include "libs/listing_065.cpp"
//~ Standard library
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include "haversine_random.h"
//~ Macro's
#define MemoryCopy memcpy
//~ Constants
#define ClusterCount 64
// NOTE(luca): A double's mantissa is 52 bits. 2^52 - 1 is 4503599627370495 which has
// 16 digits.
#define PointJsonFormat "{ \"x0\": %.15f, \"y0\": %.15f, \"x1\": %.15f, \"y1\": %.15f }\n"
//~ Types
#include "generated/types.h"
struct cluster
{
f64 X;
f64 Y;
f64 Width;
f64 Height;
};
//~ Main
int main(int ArgsCount, char *Args[], char *Env[])
{
// 1. haversine_generator [uniform/cluster] [random seed] [number of pairs to generate]
if(ArgsCount >= 4)
{
u32 Method = 0;
u64 RandomSeed = 0;;
u64 PairCount = 0;
b32 Error = false;
char *MethodString = Args[1];
char *SeedString = Args[2];
char *PairCountString = Args[3];
if(!strcmp(MethodString, "uniform"))
{
Method = Method_Uniform;
}
else if(!strcmp(MethodString, "cluster"))
{
Method = Method_Cluster;
}
else
{
Error = true;
}
RandomSeed = atoll(SeedString);
if(RandomSeed == 0)
{
if(SeedString[0] == '0')
{
RandomSeed = 0;
}
else
{
Error = true;
}
}
PairCount = atoll(PairCountString);
if(PairCount == 0)
{
Error = true;
}
if(!Error)
{
printf("Method: %s\n"
"Random seed: %lu\n"
"Pairs count: %lu\n"
, MethodString, RandomSeed, PairCount);
umm JsonMemorySize = Gigabytes(4);
u8 *JsonMemory = (u8 *)mmap(0, JsonMemorySize, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_SHARED, -1, 0);
u8 *JsonOut = JsonMemory;
umm BinMemorySize = Gigabytes(4);
u8 *BinMemory = (u8 *)mmap(0, BinMemorySize, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_SHARED, -1, 0);
u8 *BinOut = BinMemory;
// Generate pairs in the following format.
//
// {
// "pairs":
// [
// { "x0": ..., "y0": ..., "x1": ..., "y1": ... },
// { "x0": ..., "y0": ..., "x1": ..., "y1": ... }
// ]
// }
//
char *JsonHeader =
"{\n"
" \"pairs\":\n"
" [\n";
char *JsonFooter =
" ]\n"
"}\n";
JsonOut += stbsp_sprintf((char *)JsonOut, "%s", JsonHeader);
pcg64_random_t RNG = {};
pcg64_srandom_r(&RNG, RandomSeed, RandomSeed);
if(0) {}
else if(Method == Method_Uniform)
{
f64 AverageSum = 0;
f64 TotalSum = 0;
for(u64 PairsIndex = 0;
PairsIndex < PairCount;
PairsIndex += 1)
{
f64 X0 = RandomBetween(&RNG, -180.0, 180.0);
f64 Y0 = RandomBetween(&RNG, -90.0, 90.0);
f64 X1 = RandomBetween(&RNG, -180.0, 180.0);
f64 Y1 = RandomBetween(&RNG, -90.0, 360.0);
f64 Sum = ReferenceHaversine(X0, Y0, X1, Y1, 6372.8);
TotalSum += Sum;
*(f64 *)BinOut = Sum;
BinOut += sizeof(Sum);
JsonOut += stbsp_sprintf((char *)JsonOut, " " PointJsonFormat, X0, Y0, X1, Y1);
}
AverageSum = TotalSum / (f64)PairCount;
*(f64 *)BinOut = AverageSum;
BinOut += sizeof(AverageSum);
printf("Average sum: %f\n", AverageSum);
}
else if(Method == Method_Cluster)
{
cluster Clusters[ClusterCount] = {};
for(u32 ClusterIndex = 0;
ClusterIndex < ClusterCount;
ClusterIndex += 1)
{
cluster *ClusterAt = Clusters + ClusterIndex;
ClusterAt->X = RandomBetween(&RNG, -180.0, 180.0);
ClusterAt->Y = RandomBetween(&RNG, -90.0, 90.0);
ClusterAt->Width = RandomBetween(&RNG, 0.0, 180.0);
ClusterAt->Height = RandomBetween(&RNG, 0.0, 90.0);
}
f64 AverageSum = 0;
f64 TotalSum = 0;
u32 ClusterIndex = 0;
for(u32 PairIndex = 0;
PairIndex < PairCount;
PairIndex += 1)
{
cluster *ClusterAt = Clusters + ClusterIndex;
f64 X0 = RandomBetween(&RNG, ClusterAt->X - ClusterAt->Width, ClusterAt->X + ClusterAt->Width);
f64 Y0 = RandomBetween(&RNG, ClusterAt->Y - ClusterAt->Height, ClusterAt->Y + ClusterAt->Height);
f64 X1 = RandomBetween(&RNG, ClusterAt->X - ClusterAt->Width, ClusterAt->X + ClusterAt->Width);
f64 Y1 = RandomBetween(&RNG, ClusterAt->Y - ClusterAt->Height, ClusterAt->Y + ClusterAt->Height);
f64 Sum = ReferenceHaversine(X0, Y0, X1, Y1, 6372.8);
TotalSum += Sum;
*(f64 *)BinOut = Sum;
BinOut += sizeof(Sum);
JsonOut += stbsp_sprintf((char *)JsonOut, " " PointJsonFormat, X0, Y0, X1, Y1);
ClusterIndex += 1;
if(ClusterIndex == ClusterCount)
{
ClusterIndex -= ClusterCount;
}
}
AverageSum = TotalSum / (f64)PairCount;
*(f64 *)BinOut = AverageSum;
BinOut += sizeof(AverageSum);
printf("Average sum: %f\n", AverageSum);
}
else
{
Assert(0);
}
JsonOut += stbsp_sprintf((char *)JsonOut, "%s", JsonFooter);
// Write memory to json file
{
char JsonFileName[256] = {};
stbsp_sprintf(JsonFileName, "data_%lu.json", PairCount);
int File = open(JsonFileName, O_RDWR|O_CREAT|O_TRUNC, 0600);
Assert(File != -1);
smm Result = write(File, JsonMemory, JsonOut - JsonMemory);
Assert(Result == JsonOut - JsonMemory);
}
// Write memory to binary answer file
char BinFileName[256] = {};
{
stbsp_sprintf(BinFileName, "data_%lu_haveranswer.f64", PairCount);
int File = open(BinFileName, O_RDWR|O_CREAT|O_TRUNC, 0600);
Assert(File != -1);
smm Result = write(File, BinMemory, BinOut - BinMemory);
Assert(Result == BinOut - BinMemory);
}
}
else
{
printf("Usage: %s [uniform/cluster] [random seed] [number of pairs to generate]\n",
Args[0]);
}
}
else
{
printf("Usage: %s [uniform/cluster] [random seed] [number of pairs to generate]\n",
Args[0]);
}
return 0;
}
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