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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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cubiomes/README.md
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#cubiomes
A tool for seed finders that mimics the minecraft feature and biome generation.

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cubiomes/build.sh
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#!/bin/bash
gcc -c -g -O3 *.c
gcc -O3 -o "cubiomes" ./*.o -lm
rm ./*.o

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cubiomes/example.c
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/**
* example.c
*
* Author: Cubitect
* Created on: 17 Feb 2016
* Licence: GPLv3
*/
#include <stdio.h>
#include "finders.h"
/**
* An example using the getQuadHutSeedList() function to print out a list of quad witch hut seeds.
*/
int main(int argc, char **argv)
{
long qhseeds[0x10000];
int regionRange = 3, quality = 2;
long baseSeed = 0, totSeedsFound = 0;
Pos p[4];
int len, i;
initBiomes();
if(argc > 1)
sscanf(argv[1], "%ld", &baseSeed);
if(argc > 2)
sscanf(argv[2], "%d", &regionRange);
if(argc > 3)
sscanf(argv[3], "%d", &quality);
printf("Starting baseSeed: %ld Range: %d Allowed border chunks: %d\n", baseSeed, regionRange*512, quality);
// Spam stdout with quad witch hut seeds ;P
for(; totSeedsFound < (1L<<48); baseSeed++)
{
// Find the next bunch of quad-witch-hut seeds. May take a few seconds for every call.
baseSeed = getQuadHutSeedList(qhseeds, &len, p, baseSeed, regionRange, quality);
fprintf(stdout, "The following seeds have a quad witch hut with coordinates:\n");
for(i = 0; i < 4; i++)
fprintf(stdout, "(x=%d,z=%d)\n", p[i].x, p[i].z);
for(i = 0; i < len; i++)
{
fprintf(stdout, "%ld\n", qhseeds[i]);
}
totSeedsFound += len;
}
return 0;
}

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cubiomes/finders.c
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/**
* finders.c
*
* Author: Cubitect
* Created on: 17 Feb 2016
* Licence: GPLv3
*/
#include "finders.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
/*************************
* Seed finder functions *
*************************/
/**
* getQuadHutSeedList
* ------------------
* Finds a list of quad-witch-hut seeds.
*
* This function exploits the fact that the temple generation code only uses the lowest 48 bits of the seed,
* while the biome generation uses the full 64 bits (more or less [1]). It first finds the next quad-temple
* candidate after 'startBaseSeed' within the lower 48 bits using findQuadTempleCandiate(). It then loops
* over the highest two bytes and stores every seeds that has a swampland biome at each temple position.
*
* [1] There is still some complex non-random dependence on the lower 6 bytes early on in the generation. This
* causes some base-seeds to never generate a swamp at the necessary locations. This function also includes
* some optimisation to detect and avoid such seeds. (The code for this can certainly be improved though.)
*
* seedList: list of the found 64-bit quad-witch-hut seeds, this should be able to store 65536 seeds
* listLen: number of seeds that were found in the batch
* posList: list of the block positions of the 4 witch huts indexed using the enum 'TemplePos'
* (this will be the same for all the seeds in 'seedList')
* startBaseSeed: 48-bit seed that the search starts from
* regionRadius: number of regions, from 0,0 for which the search is performed
* quality: specifies the number of corner chunks that qualify for the search
* i.e. 0 = perfect position, 1 = one of the 4 chunks in each corner, 2 = one of 9 chunks etc.
*
* On success the return value is the base seed that was used to generate the seed lists.
*/
long getQuadHutSeedList(long *seedList, int *listLen, Pos *posList, const long startBaseSeed, const int regionRadius, const int quality)
{
static Generator g256, g4;
int *map256;
long baseSeed = startBaseSeed;
unsigned long i;
int x, z, j, swampNum[4], swampArea;
// testSeedNum: number of seeds to test before deciding if the seed is worth investigating further
const int testSeedNum = 48;
// minSwamp256: minimum number swamps found on MAG256 for which the search is continued
const int minSwamp256 = quality;
if(g4.layerMax == 0)
{
g256 = setupGenerator();
g4 = setupGenerator();
setGenScale(&g256, MAG256);
setGenScale(&g4, MAG4);
}
map256 = allocCache(&g256, 2, 2);
// find the next suitable base seed
while(1)
{
baseSeed = findQuadTempleCandiate(posList, baseSeed, regionRadius, quality);
x = posList[TOPLEFT].x / 256;
z = posList[TOPLEFT].z / 256;
// It turns out that even though the biomes use the entire 64-bits of the seed
// there is still some dependence in the lower 48-bits where biomes can generate.
// However, this dependence seems complex, and so we just try out a few seed to see
// if this base seed is suitable.
memset(swampNum, 0, sizeof(swampNum));
for(i = 0; i < 0xffff; i += 0xffff/testSeedNum)
{
applySeed(&g256, baseSeed+(long)(i << 48));
genArea(&g256, map256, x, z, 2, 2);
for(j = 0; j < 4; j++) if(map256[j] == swampland) swampNum[j]++;
}
swampArea = 0;
for(j = 0; j < 4; j++) if(swampNum[j]) {
swampArea++;
}
if(swampArea >= minSwamp256) break;
contSearch:
baseSeed++;
}
for(i = 0; i < 4; i++)
{
posList[i].x += 8;
posList[i].z += 8;
}
*listLen = 0;
for(i = 0; i < 0xffff; i++)
{
applySeed(&g4, baseSeed+(long)(i<<48));
if(arePointsInBiome(&g4, posList, 4, swampland))
{
seedList[*listLen] = baseSeed+(long)(i<<48);
(*listLen)++;
}
// Yes, I used goto. Get over it.
// If the seed density is less than about 1 in 64 then we're better off moving on to the next seed.
if(*listLen < 0x01 && i > 0x40) goto contSearch;
if(*listLen < 0x12 && i > 0x400) goto contSearch;
if(*listLen < 0x42 && i > 0x1000) goto contSearch;
}
for(i = 0; i < 4; i++)
{
posList[i].x -= 8;
posList[i].z -= 8;
}
return baseSeed;
}
/**
* findQuadTempleCandiate
* ----------------------
* Searches for the next seed, where four temples would generate in adjacent corners of touching regions.
* Biomes are not checked here!
*
* outList: block positions of the 4 temples, indexed using the enum 'TemplePos'
* startSeed: starting base seed, this should be a 48-bit number
* regionRadius: number of regions, from 0,0 for which the search is performed
* quality: specifies the number of corner chunks that qualify for the search
* i.e. 0 = perfect position, 1 = one of the 4 chunks in each corner, 2 = one of 9 chunks etc.
*
* On success the return value is the next base seed that can generate 4 adjacent temples.
*/
long findQuadTempleCandiate(Pos *outList, const long startSeed, const int regionRadius, const int quality)
{
const int end = regionRadius-1;
const int start = -regionRadius;
const int lower = quality, upper = 23-quality;
int z, x;
register long seed, seedXpar, seedZpar;
for(seed = startSeed;; seed++)
{
for(z = start, seedZpar = start*132897987541; z < end; z+=2, seedZpar += 2*132897987541)
{
for(x = start, seedXpar = start*341873128712; x < end; x+=2, seedXpar += 2*341873128712)
{
long seedHut = seedXpar + seedZpar + seed + 14357617;
// get the x-coordinate of the chunk position for the temple within the region
// (note that this can never be within the highest 8 chunks of the region)
int posX = firstInt24(seedHut);
// right
if(posX >= upper)
{
int posZ = secondInt24(seedHut);
if(posZ >= upper)
{
// bottom-right
if( checkTL(outList, x+1, z+1, seed, lower, upper) &&
checkTR(outList, x , z+1, seed, lower, upper) &&
checkBL(outList, x+1, z , seed, lower, upper))
{
outList[TOPLEFT].x = (x*32 + posX)*16;
outList[TOPLEFT].z = (z*32 + posZ)*16;
return seed;
}
}
else if(posZ <= lower && z > start)
{
// top-right
if( checkTL(outList, x+1, z , seed, lower, upper) &&
checkBL(outList, x+1, z-1, seed, lower, upper) &&
checkBR(outList, x , z-1, seed, lower, upper))
{
outList[BOTTOMLEFT].x = (x*32 + posX)*16;
outList[BOTTOMLEFT].z = (z*32 + posZ)*16;
return seed;
}
}
}
// left
else if(posX <= lower && x > start)
{
int posZ = secondInt24(seedHut);
if(posZ >= upper)
{
// bottom-left
if( checkTL(outList, x , z+1, seed, lower, upper) &&
checkTR(outList, x-1, z+1, seed, lower, upper) &&
checkBR(outList, x-1, z , seed, lower, upper))
{
outList[TOPRIGHT].x = (x*32 + posX)*16;
outList[TOPRIGHT].z = (z*32 + posZ)*16;
return seed;
}
}
else if(posZ <= lower && z > start)
{
// top-left
if( checkTR(outList, x-1, z , seed, lower, upper) &&
checkBR(outList, x-1, z-1, seed, lower, upper) &&
checkBL(outList, x , z-1, seed, lower, upper))
{
outList[BOTTOMRIGHT].x = (x*32 + posX)*16;
outList[BOTTOMRIGHT].z = (z*32 + posZ)*16;
return seed;
}
}
}
}
}
}
return 0;
}
/**
* findHybridTemple
* ----------------
* Finds the next seed with a desert temple that generates partially inside a swamp biome.
*
* out: block position of the hybrid temple
* spawnArea: area (in block XZ-coordinates) within the found temple that are inside a swamp.
* startSeed: starting seed for the search
* regionRadius: number of regions, from 0,0 for which the search is performed
* minSpawnArea: minimum area in block coordinates that are in a swamp
* (A desert temple has a 21*21 = 441 block area total.)
*
* On success the return value is the new found seed, 0 otherwise.
*
* Unfortunately this function appears to be redundant, as normal spawning rules seem to apply in these hybrid temples.
*/
long findHybridTemple(Pos *out, int *spawnArea, const long startSeed, const int regionRadius, const int minSpawnArea)
{
static Generator g;
int *map256, *map16, *map4, *map1;
const int end = regionRadius-1;
const int start = -regionRadius;
const int difseg = (end-start)*2;
long seed;
int x, z, rz, rx, posx, posz;
const int width4 = 5;
const int minswamp4 = minSpawnArea/16;
int i, swampnum;
if(g.layerMax == 0)
{
g = setupGenerator();
}
setGenScale(&g, MAG256);
map256 = allocCache(&g, difseg, difseg);
map16 = allocCache(&g, 3, 3);
map4 = allocCache(&g, width4, width4);
map1 = allocCache(&g, 21, 21);
for(seed = startSeed; ; seed++)
{
setGenScale(&g, MAG256);
applySeed(&g, seed);
genArea(&g, map256, start, start, difseg, difseg);
for(z = 0; z < difseg; z+=2)
{
for(x = 0; x < difseg; x+=2)
{
// get the four 256x256 areas in this region
int v00 = map256[x+0 + (z+0)*difseg];
int v01 = map256[x+0 + (z+1)*difseg];
int v10 = map256[x+1 + (z+0)*difseg];
int v11 = map256[x+1 + (z+1)*difseg];
// do we have a swamp?
if((v00 == swampland || v01 == swampland || v10 == swampland || v11 == swampland))
{
rx = start + x/2;
rz = start + z/2;
getTemplePosInRegion(&posx, &posz, rx, rz, seed);
// chunk position
posx = (rx*32 + posx);
posz = (rz*32 + posz);
setGenScale(&g, MAG16);
applySeed(&g, seed);
genArea(&g, map16, posx, posz, 3, 3);
int hasSwamp = 0, hasDesert = 0;
for(i = 0; i < 9; i++)
{
if(map16[i] == swampland) hasSwamp++;
if(map16[i] == desert || map16[i] == desertHills) hasDesert++;
}
if(hasSwamp < 3 || !hasDesert) continue;
posx *= 4; posz *= 4;
setGenScale(&g, MAG4);
applySeed(&g, seed);
genArea(&g, map4, posx+2, posz+2, 1, 1);
// do we have a good chance the temple does not start in a swamp, but is surrounded by it
if(map4[0] != desert && map4[0] != desertHills) continue;
genArea(&g, map4, posx, posz, width4, width4);
swampnum = 0;
for(i = 0; i < width4*width4; i++)
{
if(map4[i] == swampland) swampnum++;
}
if(swampnum >= minswamp4)
{
posx *= 4; posz *= 4;
setGenScale(&g, MAG1);
genArea(&g, map1, posx, posz, 21, 21);
*spawnArea = 0;
for(i = 0; i < 21*21; i++)
if(map1[i] == swampland) (*spawnArea)++;
out->x = posx;
out->z = posz;
free(map256);
free(map16);
free(map4);
free(map1);
return seed;
}
}
}
}
}
free(map256);
free(map16);
free(map4);
free(map1);
return 0;
}
/**
* findAreaWithAllBiomes
* ---------------------
* Finds the next seed for which all the biomes (ignoring mutations) are present in the specified area.
*
* The search starts at 'startSeed' and ends when either an appropriate seed has been found or when 'endSeed' has been reached.
* 'areaX' & 'areaZ' specify the block coordinated of the area, and 'width' & 'height' specify its dimensions.
*
* On success the return value is the new found seed. The return value is 0 when 'endSeed' was reached without finding a seed.
*/
long findAreaWithAllBiomes(const long startSeed, const long endSeed, const int areaX, const int areaZ, const int width, const int height)
{
static Generator g1024, gsh, g256, g4;
int *map1024, *mapsh, *map256, *map4;
const int w1024 = width/1024+2, h1024 = height/1024+2;
const int w256 = width/256+2, h256 = height/256+2;
const int w4 = width/4+2, h4 = height/4+2;
const int areaX1024 = areaX/1024-1, areaZ1024 = areaZ/1024-1;
const int areaX256 = areaX/256-1, areaZ256 = areaZ/256-1;
const int areaX4 = areaX/4-1, areaZ4 = areaZ/4-1;
long seed;
int i;
int x, z, hasSpecial;
if(g1024.layerMax == 0)
{
g1024 = setupGenerator();
gsh = setupGenerator();
g256 = setupGenerator();
g4 = setupGenerator();
setGenScale(&g1024, MAG1024);
setGenScale(&gsh, MAGSHROOM);
setGenScale(&g256, MAG256);
setGenScale(&g4, MAG4);
}
map1024 = allocCache(&g1024, w1024, h1024);
mapsh = allocCache(&gsh, w256, h256);
map256 = allocCache(&g256, w256, h256);
map4 = allocCache(&g4, w4, h4);
volatile int biomeCnt;
int typeList[BTYPE_NUM];
int biomeList[BIOME_NUM];
for(seed = startSeed; seed <= endSeed; seed++)
{
applySeed(&g1024, seed);
listBiomeTypes(&g1024, map1024, seed, typeList, areaX1024, areaZ1024, w1024, h1024);
if(!typeList[Forest] || !typeList[Ocean] || !typeList[Plains] || !typeList[Desert] || !typeList[Hills]) continue;
// Apply the 'Special' layer to see if there is a chance for a Mega Taiga biome (6% faster)
hasSpecial = 0;
for(z = 0; z < h1024 && !hasSpecial; z++)
{
for(x = 0; x < w1024; x++)
{
int v = map1024[x + z*w1024];
if(v == 0) continue;
setChunkSeed(&g1024.layers[12], (long)(x + areaX1024), (long)(z + areaZ1024));
if(mcNextInt(&g1024.layers[12], 13) == 0) {
hasSpecial++;
break;
}
}
}
if(!hasSpecial) continue;
// Check for a mushroom island early on, as this excludes a great proportion of seeds.
applySeed(&gsh, seed);
listBiomeTypes(&gsh, mapsh, seed, typeList, areaX256, areaZ256, w256, h256);
if(!typeList[MushroomIsland]) {
continue;
}
// Check the necessary biomes types are present, which ignores mutations, variation and rivers.
applySeed(&g256, seed);
listBiomeTypes(&g256, map256, seed, typeList, areaX256, areaZ256, w256, h256);
// List of all types: Ocean, Plains, Desert, Hills, Forest, Taiga, Swamp, River, Hell, Sky, Snow, MushroomIsland, Beach, Jungle, StoneBeach, Savanna, Mesa
if(!typeList[Ocean] || !typeList[Plains] || !typeList[Desert] || !typeList[Hills]) continue;
if(!typeList[Forest] || !typeList[Taiga] || !typeList[Swamp] || !typeList[Snow]) continue;
if(!typeList[MushroomIsland] || !typeList[Jungle] || !typeList[Savanna] || !typeList[Mesa]) continue;
// Finally count the number of biomes of the fully generated map.
// There are 36 biomes that could generate in total.
applySeed(&g4, seed);
listBiomes(&g4, map4, seed, biomeList, areaX4, areaZ4, w4, h4);
biomeCnt = 0;
for(i = 0; i < BIOME_NUM; i++){
if(biomeList[i]) biomeCnt++;
}
// give an update whenever a seed got this far through the sieves.
// printf("update:%ld:%d\n", seed, biomeCnt);
if(biomeCnt >= 36){
free(map1024);
free(mapsh);
free(map256);
free(map4);
return seed;
}
}
return 0;
}
/********************
* Helper functions *
********************/
/* findBiomePosition
* -----------------
* Finds a suitable pseudo-random location in the specified area.
* Used to determine the positions of spawn and stongholds.
* Warning: accurate, but slow!
*/
void findBiomePosition(Generator *g, Pos *out, int centerX, int centerZ, int range, const int *biomeList, long *seed)
{
int x1 = (centerX-range) >> 2;
int z1 = (centerZ-range) >> 2;
int x2 = (centerX+range) >> 2;
int z2 = (centerZ+range) >> 2;
int width = x2 - x1 + 1;
int height = z2 - z1 + 1;
int *map = allocCache(g, width, height);
genArea(g, map, x1, z1, width, height);
int i, found = 0;
for(i = 0; i < width*height; i++)
{
int biome = map[i];
if(biomeList[biome & 0xff] && (found == 0 || nextInt(seed, found + 1) == 0))
{
out->x = (x1 + i%width) << 2;
out->z = (z1 + i/width) << 2;
++found;
}
}
free(map);
}
/* areBiomesViable
* ---------------
* Determines if the given area contains only biomes specified by 'biomeList'.
* Used to determine the positions of ocean monuments and villages.
* Warning: accurate, but slow!
*/
int areBiomesViable(Generator *g, int posX, int posZ, int radius, const int *biomeList, const int listLen)
{
int x1 = (posX - radius) >> 2;
int z1 = (posZ - radius) >> 2;
int x2 = (posX + radius) >> 2;
int z2 = (posZ + radius) >> 2;
int width = x2 - x1 + 1;
int height = z2 - z1 + 1;
int i, j;
int *map = allocCache(g, width, height);
genArea(g, map, x1, z1, width, height);
for(i = 0; i < width*height; i++)
{
for(j = 0; j < listLen; j++)
{
if(map[i] == biomeList[j]) break;
}
if(j >= listLen)
{
free(map);
return 0;
}
}
free(map);
return 1;
}
// Breaks in 1.9
void findStrongholds(Generator *g, Pos *locations)
{
static int validStrongholdBiomes[256];
const int SHNUM = 3;
long worldSeed = g->rawSeed;
int i;
if(!validStrongholdBiomes[plains])
{
int id;
for(id = 0; id < 256; id++)
{
if(biomeExists(id) && biomes[id].height > 0.0) validStrongholdBiomes[id] = 1;
}
}
if(g->mag != MAG4)
{
printf("findStrongholds() requires a 1 to 4 generator resolution.\n");
for(i = 0; i < SHNUM; i++)
{
locations[i].x = locations[i].z = 0;
}
return;
}
setSeed(&worldSeed);
double angle = nextDouble(&worldSeed) * 3.141592653589793 * 2.0;
for(i = 0; i < SHNUM; i++)
{
double distance = (1.25 + nextDouble(&worldSeed)) * 32.0;
int x = (int)round(cos(angle) * distance);
int z = (int)round(sin(angle) * distance);
findBiomePosition(g, &locations[i], (x << 4) + 8, (z << 4) + 8, 112, validStrongholdBiomes, &worldSeed);
angle += 6.283185307179586 / (double)SHNUM;
}
}
/* getTemplePosInRegion
* --------------------
* finds the chunk position within the specified region (32x32 chunks) where the temple generation attempt will occur.
*/
void getTemplePosInRegion(int *outX, int *outZ, int regionX, int regionZ, long seed)
{
seed = regionX*341873128712 + regionZ*132897987541 + seed + 14357617;
setSeed(&(seed));
*outX = nextInt(&seed, 24);
*outZ = nextInt(&seed, 24);
}
/* getOceanMonumentPosInRegion
* --------------------
* finds the chunk position within the specified region (32x32 chunks) where the ocean monument generation attempt will occur.
*/
void getOceanMonumentPosInRegion(int *outX, int *outZ, int regionX, int regionZ, long seed)
{
seed = regionX*341873128712 + regionZ*132897987541 + seed + 10387313;
setSeed(&(seed));
*outX = (nextInt(&seed, 27) + nextInt(&seed, 27)) / 2;
*outZ = (nextInt(&seed, 27) + nextInt(&seed, 27)) / 2;
}
/* isViableOceanMonumentPos
* --------------------
* checks if the given block coordinates are valid for an Ocean Monument
* (This seems to have changed in MC 1.9)
*/
int isViableOceanMonumentPos(Generator *g, int blockX, int blockZ)
{
int ret, mag = g->mag;
setGenScale(g, MAG4);
int map[0x1000];
genArea(g, map, blockX>>1, blockZ>>1, 1, 1);
if(map[0] != deepOcean)
{
setGenScale(g, mag);
return 0;
}
ret = areBiomesViable(g, blockX, blockZ, 29, oceanMonumentBiomeList, sizeof(oceanMonumentBiomeList)/sizeof(int));
setGenScale(g, mag);
return ret;
}
int checkBR(Pos *posList, const int x, const int z, long seed, const int lower, const int upper)
{
long s = x*341873128712 + z*132897987541 + seed + 14357617;
int Xpos = firstInt24(s);
if(Xpos >= upper)
{
int Zpos = secondInt24(s);
if(Zpos >= upper)
{
posList[TOPLEFT].x = (x*32 + Xpos)*16;
posList[TOPLEFT].z = (z*32 + Zpos)*16;
return 1;
}
}
return 0;
}
int checkBL(Pos *posList, const int x, const int z, long seed, const int lower, const int upper)
{
long s = x*341873128712 + z*132897987541 + seed + 14357617;
int Xpos = firstInt24(s);
if(Xpos <= lower)
{
int Zpos = secondInt24(s);
if(Zpos >= upper)
{
posList[TOPRIGHT].x = (x*32 + Xpos)*16;
posList[TOPRIGHT].z = (z*32 + Zpos)*16;
return 1;
}
}
return 0;
}
int checkTR(Pos *posList, const int x, const int z, long seed, const int lower, const int upper)
{
long s = x*341873128712 + z*132897987541 + seed + 14357617;
int Xpos = firstInt24(s);
if(Xpos >= upper)
{
int Zpos = secondInt24(s);
if(Zpos <= lower)
{
posList[BOTTOMLEFT].x = (x*32 + Xpos)*16;
posList[BOTTOMLEFT].z = (z*32 + Zpos)*16;
return 1;
}
}
return 0;
}
int checkTL(Pos *posList, const int x, const int z, long seed, const int lower, const int upper)
{
long s = x*341873128712 + z*132897987541 + seed + 14357617;
int Xpos = firstInt24(s);
if(Xpos <= lower)
{
int Zpos = secondInt24(s);
if(Zpos <= lower)
{
posList[BOTTOMRIGHT].x = (x*32 + Xpos)*16;
posList[BOTTOMRIGHT].z = (z*32 + Zpos)*16;
return 1;
}
}
return 0;
}
/* arePointsInBiome
* ----------------
* returns non-zero if all the points appear to be in the specified biome.
*/
int arePointsInBiome(Generator *g, Pos *pos, const int num, const int biome)
{
static int ints[0x1000];
int i;
for(i = 0; i < 4; i++)
{
genArea(g, &ints[0], pos[i].x/4, pos[i].z/4, 1, 1);
if(ints[0] != biome) {
return 0;
}
}
return 1;
}
void listBiomes(Generator *g, int *map, long seed, int *biomeList, const int x, const int z, const int width, const int height)
{
const int size = width*height;
int i;
memset(biomeList, 0, sizeof(int)*BIOME_NUM);
genArea(g, map, x, z, width, height);
for(i = 0; i < size; i++){
biomeList[map[i] & 0x7f] = 1;
}
}
void listBiomeTypes(Generator *g, int *map, long seed, int *typeList, const int x, const int z, const int width, const int height)
{
const int size = width*height;
int i;
memset(typeList, 0, sizeof(int)*BTYPE_NUM);
genArea(g, map, x, z, width, height);
for(i = 0; i < size; i++){
typeList[getBiomeType(map[i])] = 1;
}
}
/* C copy of the Java Random methods */
inline void setSeed(long *seed)
{
*seed = (*seed ^ 0x5DEECE66DL) & ((1L << 48) - 1);
}
inline int next(long *seed, const int bits)
{
*seed = (*seed * 0x5DEECE66DL + 0xBL) & ((1L << 48) - 1);
return (int) (*seed >> (48 - bits));
}
inline int nextInt(long *seed, const int n)
{
int bits, val;
do {
bits = next(seed, 31);
val = bits % n;
}
while(bits - val + (n - 1) < 0);
return val;
}
inline long nextLong(long *seed)
{
return ((long) next(seed, 32) << 32) + next(seed, 32);
}
inline float nextFloat(long *seed)
{
return next(seed, 24) / (float) (1 << 24);
}
inline double nextDouble(long *seed)
{
return (((long) next(seed, 26) << 27) + next(seed, 27)) / (double) (1L << 53);
}
// Stripped variants for the first and second call to nextInt(24).
inline int firstInt24(long seed)
{
seed ^= 0x5DEECE66D;
seed = (seed * 0x5DEECE66D) & 0xffffffffffff;
seed >>= 17;
return seed % 24;
}
inline int secondInt24(long seed)
{
seed ^= 0x5DEECE66D;
seed = (seed * 0x5DEECE66D + 0xB) & 0xffffffffffff;
seed = (seed * 0x5DEECE66D) & 0xffffffffffff;
seed >>= 17;
return seed % 24;
}

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/**
* finders.h
*
* Author: Cubitect
* Created on: 17 Feb 2016
* Licence: GPLv3
*/
#ifndef FINDERS_H_
#define FINDERS_H_
#include "generator.h"
enum TemplePos { TOPLEFT, TOPRIGHT, BOTTOMLEFT, BOTTOMRIGHT };
static const int oceanMonumentBiomeList[] = {ocean, deepOcean, river, frozenOcean, frozenRiver};
STRUCT(Pos)
{
int x, z;
};
/****************
* Seed finders *
****************/
/**
* getQuadHutSeedList
* ------------------
* Finds a list of quad-witch-hut seeds.
*
* seedList: list of the found 64-bit quad-witch-hut seeds, this should be able to store 65536 seeds
* listLen: number of seeds that were found in the batch
* posList: list of the block positions of the 4 witch huts indexed using the enum 'TemplePos'
* (this will be the same for all the seeds in 'seedList')
* startBaseSeed: 48-bit seed that the search starts from
* regionRadius: number of regions, from 0,0 for which the search is performed
* quality: specifies the number of corner chunks that qualify for the search
* i.e. 0 = perfect position, 1 = one of the 4 chunks in each corner, 2 = one of 9 chunks etc.
*
* On success the return value is the base seed that was used to generate the seed lists.
*/
long getQuadHutSeedList(long *seedList, int *listLen, Pos *posList, const long startBaseSeed, const int regionRadius, const int quality);
/**
* findQuadTempleCandiate
* ----------------------
* Searches for the next seed, where four temples would generate in adjacent corners of touching regions.
* Biomes are not checked here!
*
* outList: block positions of the 4 temples, indexed using the enum 'TemplePos'
* startSeed: starting base seed, this should be a 48-bit number
* regionRadius: number of regions, from 0,0 for which the search is performed
* quality: specifies the number of corner chunks that qualify for the search
* i.e. 0 = perfect position, 1 = one of the 4 chunks in each corner, 2 = one of 9 chunks etc.
*
* On success the return value is the next base seed that can generate 4 adjacent temples.
*/
long findQuadTempleCandiate(Pos *outList, const long startSeed, const int regionRadius, const int quality);
/**
* findHybridTemple
* ----------------
* Finds the next seed with a desert temple that generates partially inside a swamp biome.
*
* out: block position of the hybrid temple
* spawnArea: area (in block XZ-coordinates) within the found temple that are inside a swamp.
* startSeed: starting seed for the search
* regionRadius: number of regions, from 0,0 for which the search is performed
* minSpawnArea: minimum area in block coordinates that are in a swamp
* (A desert temple has a 21*21 = 441 block area total.)
*
* On success the return value is the new found seed, 0 otherwise.
*
* Unfortunately this function appears to be redundant, as normal spawning rules seem to apply in these hybrid temples.
*/
long findHybridTemple(Pos *out, int *spawnArea, const long startSeed, const int regionRadius, const int minSpawnArea);
/**
* findAreaWithAllBiomes
* ---------------------
* Finds the next seed for which all the biomes (ignoring mutations) are present in the specified area.
*
* The search starts at 'startSeed' and ends when either an appropriate seed has been found or when 'endSeed' has been reached.
* 'areaX' & 'areaZ' specify the block coordinated of the area, and 'width' & 'height' specify its dimensions.
*
* On success the return value is the new found seed. The return value is 0 when 'endSeed' was reached without finding a seed.
*/
long findAreaWithAllBiomes(const long startSeed, const long endSeed, const int areaX, const int areaZ, const int width, const int height);
/*******************
* Feature finders *
*******************/
void findStrongholds(Generator *g, Pos *locations);
/********************
* Helper functions *
********************/
// Implementations of vanilla mc biome checkers
void findBiomePosition(Generator *g, Pos *out, int centerX, int centerZ, int range, const int *biomeList, long *seed);
int areBiomesViable(Generator *g, int posX, int posZ, int radius, const int *biomeList, const int listLen);
// Directional witch hut position checkers
int checkBR(Pos *posList, const int x, const int z, long seed, const int lower, const int upper);
int checkBL(Pos *posList, const int x, const int z, long seed, const int lower, const int upper);
int checkTR(Pos *posList, const int x, const int z, long seed, const int lower, const int upper);
int checkTL(Pos *posList, const int x, const int z, long seed, const int lower, const int upper);
// List the biomes/types that are in the specified area (using the current generator settings)
// The output is a boolean (int) array.
void listBiomes(Generator *g, int *map, long seed, int *biomeList, const int x, const int z, const int width, const int height);
void listBiomeTypes(Generator *g, int *map, long seed, int *typeList, const int x, const int z, const int width, const int height);
// Various
void getTemplePosInRegion(int *outX, int *outZ, int regionX, int regionZ, long seed);
void getOceanMonumentPosInRegion(int *outX, int *outZ, int regionX, int regionZ, long seed);
int isViableOceanMonumentPos(Generator *g, int blockX, int blockZ);
int arePointsInBiome(Generator *g, Pos *pos, int num, int biome);
/*************************************
* C copy of the Java Random methods *
*************************************/
inline void setSeed(long *seed);
inline int next(long *seed, const int bits);
inline int nextInt(long *seed, const int n);
inline long nextLong(long *seed);
inline float nextFloat(long *seed);
inline double nextDouble(long *seed);
// Custom, faster alternative for the first and second call to nextInt(24)
inline int firstInt24(long seed);
inline int secondInt24(long seed);
#endif /* FINDERS_H_ */

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/**
* generator.c
*
* Author: Cubitect
* Created on: 17 Feb 2016
* Licence: GPLv3
*/
#include "generator.h"
#include "layers.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int *allocCache(Generator *g, int sizeX, int sizeZ)
{
int size = calcRequiredBuf(g, sizeX, sizeZ);
if(size < 256) size = 256;
int *ret = (int*) malloc(sizeof(*ret)*size);
memset(ret, 0, sizeof(*ret)*size);
return ret;
}
void setupLayer(Layer *l, Layer *p, int s, void (*getMap)(Layer *layer, int *out, int x, int z, int w, int h))
{
setBaseSeed(l, s);
l->p = p;
l->p2 = NULL;
l->getMap = getMap;
}
void setupMultiLayer(Layer *l, Layer *p1, Layer *p2, int s, void (*getMap)(Layer *layer, int *out, int x, int z, int w, int h))
{
setBaseSeed(l, s);
l->p = p1;
l->p2 = p2;
l->getMap = getMap;
}
Generator setupGenerator()
{
if(biomes[plains].id == 0)
{
fprintf(stderr, "Warning: The biomes have to be initialised first using initBiomes() before any generator can be used.\n");
}
Generator g;
g.rawSeed = 0;
g.mag = 1;
g.layerNum = 44;
g.layerMax = 44;
g.layers = (Layer*) malloc(sizeof(Layer)*g.layerNum);
// LAYER PARENT SEED LAYER_FUNCTION
setupLayer(&g.layers[ 0], NULL, 1, mapIsland);
setupLayer(&g.layers[ 1], &g.layers[ 0], 2000, mapZoom);
setupLayer(&g.layers[ 2], &g.layers[ 1], 1, mapAddIsland);
setupLayer(&g.layers[ 3], &g.layers[ 2], 2001, mapZoom);
setupLayer(&g.layers[ 4], &g.layers[ 3], 2, mapAddIsland);
setupLayer(&g.layers[ 5], &g.layers[ 4], 50, mapAddIsland);
setupLayer(&g.layers[ 6], &g.layers[ 5], 70, mapAddIsland);
setupLayer(&g.layers[ 7], &g.layers[ 6], 2, mapRemoveTooMuchOcean);
setupLayer(&g.layers[ 8], &g.layers[ 7], 2, mapAddSnow);
setupLayer(&g.layers[ 9], &g.layers[ 8], 3, mapAddIsland);
setupLayer(&g.layers[10], &g.layers[ 9], 2, mapCoolWarm); // MAG1024
setupLayer(&g.layers[11], &g.layers[10], 2, mapHeatIce);
setupLayer(&g.layers[12], &g.layers[11], 3, mapSpecial);
setupLayer(&g.layers[13], &g.layers[12], 2002, mapZoom);
setupLayer(&g.layers[14], &g.layers[13], 2003, mapZoom);
setupLayer(&g.layers[15], &g.layers[14], 4, mapAddIsland);
setupLayer(&g.layers[16], &g.layers[15], 5, mapAddMushroomIsland); // MAGSHROOM
setupLayer(&g.layers[17], &g.layers[16], 4, mapDeepOcean);
// biome layer chain
setupLayer(&g.layers[18], &g.layers[17], 200, mapBiome); // MAG256
setupLayer(&g.layers[19], &g.layers[18], 1000, mapZoom);
setupLayer(&g.layers[20], &g.layers[19], 1001, mapZoom);
setupLayer(&g.layers[21], &g.layers[20], 1000, mapBiomeEdge);
// basic river layer chain, used to determine where hills generate
setupLayer(&g.layers[22], &g.layers[17], 100, mapRiverInit);
setupLayer(&g.layers[23], &g.layers[22], 1000, mapZoom);
setupLayer(&g.layers[24], &g.layers[23], 1001, mapZoom);
setupMultiLayer(&g.layers[25], &g.layers[21], &g.layers[24], 1000, mapHills); // MAG64
// river layer chain
setupLayer(&g.layers[26], &g.layers[22], 1000, mapZoom);
setupLayer(&g.layers[27], &g.layers[26], 1001, mapZoom);
setupLayer(&g.layers[28], &g.layers[27], 1000, mapZoom);
setupLayer(&g.layers[29], &g.layers[28], 1001, mapZoom);
setupLayer(&g.layers[30], &g.layers[29], 1002, mapZoom);
setupLayer(&g.layers[31], &g.layers[30], 1003, mapZoom);
setupLayer(&g.layers[32], &g.layers[31], 1, mapRiver);
setupLayer(&g.layers[33], &g.layers[32], 1000, mapSmooth);
setupLayer(&g.layers[34], &g.layers[25], 1001, mapRareBiome);
setupLayer(&g.layers[35], &g.layers[34], 1000, mapZoom);
setupLayer(&g.layers[36], &g.layers[35], 3, mapAddIsland);
setupLayer(&g.layers[37], &g.layers[36], 1001, mapZoom);
setupLayer(&g.layers[38], &g.layers[37], 1000, mapShore); // MAG16
setupLayer(&g.layers[39], &g.layers[38], 1002, mapZoom);
setupLayer(&g.layers[40], &g.layers[39], 1003, mapZoom);
setupLayer(&g.layers[41], &g.layers[40], 1000, mapSmooth);
setupMultiLayer(&g.layers[42], &g.layers[41], &g.layers[33], 100, mapRiverMix);
setupLayer(&g.layers[43], &g.layers[42], 10, mapVoronoiZoom);
return g;
}
void setGenScale(Generator *g, int magnification)
{
switch(magnification)
{
case MAG1:
g->mag = MAG1;
g->layerNum = 44;
break;
case MAG4:
g->mag = MAG4;
g->layerNum = 43;
break;
case MAG16:
g->mag = MAG16;
g->layerNum = 39;
break;
case MAG64:
g->mag = MAG64;
g->layerNum = 26;
break;
case MAG256:
g->mag = MAG256;
g->layerNum = 19;
break;
case MAGSHROOM:
g->mag = MAGSHROOM;
g->layerNum = 17;
break;
case MAG1024:
g->mag = MAG1024;
g->layerNum = 11;
break;
}
}
int calcRequiredBuf(Generator *g, int areaX, int areaZ)
{
areaX += 2;
areaZ += 2;
int i, maxX = areaX, maxZ = areaZ;
for(i = g->layerNum-1; i >= 0; i--)
{
if(g->layers[i].getMap == mapZoom)
{
areaX = (areaX >> 1) + 2; areaZ = (areaZ >> 1) + 2;
}
else if(g->layers[i].getMap == mapVoronoiZoom)
{
areaX = (areaX >> 2) + 2; areaZ = (areaZ >> 2) + 2;
}
else
{
if(g->layers[i].getMap == mapIsland) continue;
if(g->layers[i].getMap == mapSpecial) continue;
if(g->layers[i].getMap == mapBiome) continue;
if(g->layers[i].getMap == mapRiverInit) continue;
if(g->layers[i].getMap == mapRiverMix) continue;
areaX += 2;
areaZ += 2;
}
if(areaX > maxX) maxX = areaX;
if(areaZ > maxZ) maxZ = areaZ;
}
return (maxX+2) * (maxZ+2);
}
void freeGenerator(Generator *g)
{
free(g->layers);
}
void applySeed(Generator *g, long seed)
{
g->rawSeed = seed;
// the seed has to be applied recursively, such that the branching layer chains (of parent 2) keep a world seed of zero
setWorldSeed(&g->layers[g->layerNum-1], seed);
}
void genArea(Generator *g, int *out, int areaX, int areaZ, int areaWidth, int areaHeight)
{
Layer *l = &g->layers[g->layerNum-1];
memset(out, 0, areaWidth*areaHeight*sizeof(*out));
l->getMap(l, out, areaX, areaZ, areaWidth, areaHeight);
}

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/**
* generator.h
*
* Author: Cubitect
* Created on: 17 Feb 2016
* Licence: GPLv3
*/
#ifndef GENERATOR_H_
#define GENERATOR_H_
#include "layers.h"
/* If speed is more important than accuracy, here are some magnification modes for the generator.
* The map generation is done in stages (layers), some of which zoom into the map, magnifying it.
* These magnification modes control at which stage/magnification the map generation is aborted.
*
* Notes on magnification modes:
* MAG1 - 1 to 1 scale, exact map of the biomes
* MAG4 - 1 to 4 scale, used by some vanilla mc-generation as a faster alternative to the full scale map
* MAG16 - 1 to 16 scale, contains all biomes, except rivers
* MAG64 - 1 to 64 scale, misses oceanic features like beaches, small islands and rare biomes (Sunflower Plains).
* MAG256 - 1 to 256 scale, contains all the basic biomes, no variations (e.g. no hills and no mutations).
* MAGSHROOM, 1 to 256 scale, exploits that Mushroom Islands are determined before most other biomes.
* MAG1024 - 1 to 1024 scale, extreme scale that only contains basic information where biome types generate.
*/
enum Magnification { MAG1, MAG4, MAG16, MAG64, MAG256, MAGSHROOM, MAG1024 };
STRUCT(Generator) {
Layer *layers;
int layerNum;
int layerMax;
int mag;
long rawSeed;
};
// Initialise an instance of a generator
Generator setupGenerator();
// Sets the magnification mode of the generator
void setGenScale(Generator *g, int magnification);
// Cleans up and frees the generator layers
void freeGenerator(Generator *g);
// Allocates an amount of memory required to generate an area of dimensions 'sizeX' by 'sizeZ'
int *allocCache(Generator *g, int sizeX, int sizeZ);
// Calculates the minimum size of the buffers required to generate an area of dimensions 'sizeX' by 'sizeZ'
int calcRequiredBuf(Generator *g, int sizeX, int sizeZ);
// Sets the world seed for the generator
void applySeed(Generator *g, long seed);
/**
* genArea
* -------
* Generates the specified area using the current generator settings and stores the biomeIDs in 'out'.
* The biomeIDs will be indexed in the form: out[x + z*areaWidth]
* It is recommended that 'out' is allocated using allocCache() for the correct buffer size.
*/
void genArea(Generator *g, int *out, int startX, int startZ, int areaWidth, int areaHeight);
#endif /* GENERATOR_H_ */

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/**
* layers.h
*
* Author: Cubitect
* Created on: 17 Feb 2016
* Licence: GPLv3
*/
#ifndef LAYER_H_
#define LAYER_H_
#define STRUCT(S) typedef struct S S; struct S
/*
* Annoyingly the gcc compiler breaks some of the simple layer generation functions on the -O3 optimisation level.
* Declaring these functions with the attribute below keeps them from misbehaving.
* (Declaring the looping variables in the function as volatile also works, but is slower in most cases.)
*/
#define OPT_O2 __attribute__((optimize("O2")))
enum BiomeID {
none = -1,
ocean = 0, plains, desert, extremeHills, forest, taiga, swampland, river, hell, sky, // 0-9
frozenOcean, frozenRiver, icePlains, iceMountains, mushroomIsland, mushroomIslandShore, beach, desertHills, forestHills, taigaHills, // 10-19
extremeHillsEdge, jungle, jungleHills, jungleEdge, deepOcean, stoneBeach, coldBeach, birchForest, birchForestHills, roofedForest, // 20-29
coldTaiga, coldTaigaHills, megaTaiga, megaTaigaHills, extremeHillsPlus, savanna, savannaPlateau, mesa, mesaPlateau_F, mesaPlateau, // 30-39
BIOME_NUM
};
enum BiomeType {
Ocean, Plains, Desert, Hills, Forest, Taiga, Swamp, River, Hell, Sky, Snow, MushroomIsland, Beach, Jungle, StoneBeach, Savanna, Mesa, BTYPE_NUM
};
enum BiomeTempCategory {
Oceanic, Warm, Lush, Cold, Freezing, Unknown
};
STRUCT(Biome) {
int id;
int type;
double height;
double temp;
int tempCat;
};
STRUCT(Layer) {
long baseSeed; // Generator seed (depends only on hierarchy of generator)
long worldSeed; // based on the seed of the world
long chunkSeed; // randomiser seed
void (*getMap)(Layer *layer, int *out, int x, int z, int w, int h);
Layer *p, *p2;
};
Biome biomes[256];
static void initAddBiome(int id, int tempCat, int biometype, float temp, float height)
{
if(id & (~0xff)) return;
biomes[id].id = id;
biomes[id].type = biometype;
biomes[id].temp = temp;
biomes[id].height = height;
biomes[id].tempCat = tempCat;
}
static void createMutation(int id)
{
biomes[id+128] = biomes[id];
biomes[id+128].id = id+128;
}
/* initBiomes() has to be called before any of the generators can be used */
static void initBiomes()
{
int i;
for(i = 0; i < 256; i++) biomes[i].id = none;
const double hDefault = 0.1, hShallowWaters = -0.5, hOceans = -1.0, hDeepOceans = -1.8, hLowPlains = 0.125;
const double hMidPlains = 0.2, hLowHills = 0.45, hHighPlateaus = 1.5, hMidHills = 1.0, hShores = 0.0;
const double hRockyWaters = 0.1, hLowIslands = 0.2, hPartiallySubmerged = -0.2;
initAddBiome(ocean, Oceanic, Ocean, 0.5, hOceans);
initAddBiome(plains, Lush, Plains, 0.8, hDefault);
initAddBiome(desert, Warm, Desert, 2.0, hLowPlains);
initAddBiome(extremeHills, Lush, Hills, 0.2, hMidHills);
initAddBiome(forest, Lush, Forest, 0.7, hDefault);
initAddBiome(taiga, Lush, Taiga, 0.25, hMidPlains);
initAddBiome(swampland, Lush, Swamp, 0.8, hPartiallySubmerged);
initAddBiome(river, Lush, River, 0.5, hShallowWaters);
initAddBiome(hell, Warm, Hell, 2.0, hDefault);
initAddBiome(sky, Lush, Sky, 0.5, hDefault);
initAddBiome(frozenOcean, Oceanic, Ocean, 0.0, hOceans);
initAddBiome(frozenRiver, Cold, River, 0.0, hShallowWaters);
initAddBiome(icePlains, Cold, Snow, 0.0, hLowPlains);
initAddBiome(iceMountains, Cold, Snow, 0.0, hLowHills);
initAddBiome(mushroomIsland, Lush, MushroomIsland, 0.9, hLowIslands);
initAddBiome(mushroomIslandShore, Lush, MushroomIsland, 0.9, hShores);
initAddBiome(beach, Lush, Beach, 0.8, hShores);
initAddBiome(desertHills, Warm, Desert, 2.0, hLowHills);
initAddBiome(forestHills, Lush, Forest, 0.7, hLowHills);
initAddBiome(taigaHills, Lush, Taiga, 0.25, hLowHills);
initAddBiome(extremeHillsEdge, Lush, Hills, 0.2, hMidHills);
initAddBiome(jungle, Lush, Jungle, 0.95, hDefault);
initAddBiome(jungleHills, Lush, Jungle, 0.95, hLowHills);
initAddBiome(jungleEdge, Lush, Jungle, 0.95, hDefault);
initAddBiome(deepOcean, Oceanic, Ocean, 0.5, hDeepOceans);
initAddBiome(stoneBeach, Lush, StoneBeach, 0.2, hRockyWaters);
initAddBiome(coldBeach, Cold, Beach, 0.05, hShores);
initAddBiome(birchForest, Lush, Forest, 0.6, hDefault);
initAddBiome(birchForestHills, Lush, Forest, 0.6, hLowHills);
initAddBiome(roofedForest, Lush, Forest, 0.7, hDefault);
initAddBiome(coldTaiga, Cold, Taiga, -0.5, hMidPlains);
initAddBiome(coldTaigaHills, Cold, Taiga, -0.5, hLowHills);
initAddBiome(megaTaiga, Lush, Taiga, 0.3, hMidPlains);
initAddBiome(megaTaigaHills, Lush, Taiga, 0.3, hLowHills);
initAddBiome(extremeHillsPlus, Lush, Hills, 0.2, hMidHills);
initAddBiome(savanna, Warm, Savanna, 1.2, hLowPlains);
initAddBiome(savannaPlateau, Warm, Savanna, 1.0, hHighPlateaus);
initAddBiome(mesa, Warm, Mesa, 2.0, hDefault);
initAddBiome(mesaPlateau_F, Warm, Mesa, 2.0, hHighPlateaus);
initAddBiome(mesaPlateau, Warm, Mesa, 2.0, hHighPlateaus);
createMutation(plains);
createMutation(desert);
createMutation(extremeHills);
createMutation(forest);
createMutation(taiga);
createMutation(swampland);
createMutation(icePlains);
createMutation(jungle);
createMutation(jungleEdge);
createMutation(birchForest);
createMutation(birchForestHills);
createMutation(roofedForest);
createMutation(coldTaiga);
createMutation(megaTaiga);
createMutation(megaTaigaHills);
createMutation(extremeHillsPlus);
createMutation(savanna);
createMutation(savannaPlateau);
createMutation(mesa);
createMutation(mesaPlateau_F);
createMutation(mesaPlateau);
}
static int getBiomeType(int id)
{
return biomes[id & 0xff].type;
}
static int biomeExists(int id)
{
return !(biomes[id & 0xff].id & (~0xff));
}
static int getTempCategory(int id)
{
return biomes[id & 0xff].tempCat;
}
static int equalOrPlateau(int id1, int id2)
{
if(id1 == id2) return 1;
if(id1 == mesaPlateau_F || id1 == mesaPlateau) return id2 == mesaPlateau_F || id2 == mesaPlateau;
if(!biomeExists(id1) || !biomeExists(id2)) return 0;
// adjust for asymmetric equality (workaround to simulate a bug in the MC java code)
if(id1 >= 128 || id2 >= 128) {
// skip biomes that did not overload the isEqualTo() method
if(id2 == 130 || id2 == 133 || id2 == 134 || id2 == 149 || id2 == 151 || id2 == 155 ||
id2 == 156 || id2 == 157 || id2 == 158 || id2 == 163 || id2 == 164) return 0;
}
return getBiomeType(id1) == getBiomeType(id2);
}
static int canBeNeighbors(int id1, int id2)
{
if(equalOrPlateau(id1, id2)) return 1;
if(!biomeExists(id1) || !biomeExists(id2)) return 0;
int tempCat1 = getTempCategory(id1); if(tempCat1 == Lush) return 1;
int tempCat2 = getTempCategory(id2); if(tempCat2 == Lush) return 1;
return tempCat1 == tempCat2;
}
static int isOceanic(int id)
{
return id == ocean || id == deepOcean || id == frozenOcean;
}
static int isBiomeSnowy(int id)
{
return biomeExists(id) && biomes[id&0xff].temp < 0.1;
}
static int mcNextInt(Layer *layer, int mod)
{
int ret = (int)((layer->chunkSeed >> 24) % (long)mod);
if (ret < 0)
{
ret += mod;
}
layer->chunkSeed *= layer->chunkSeed * 6364136223846793005L + 1442695040888963407L;
layer->chunkSeed += layer->worldSeed;
return ret;
}
void setChunkSeed(Layer *layer, long chunkX, long chunkZ);
void setBaseSeed(Layer *layer, long seed);
void setWorldSeed(Layer *layer, long seed);
void mapIsland(Layer *l, int *out, int x, int z, int w, int h);
void mapZoom(Layer *l, int *out, int x, int z, int w, int h);
void mapAddIsland(Layer *l, int *out, int x, int z, int w, int h);
void mapRemoveTooMuchOcean(Layer *l, int *out, int x, int z, int w, int h);
void mapAddSnow(Layer *l, int *out, int x, int z, int w, int h);
void mapCoolWarm(Layer *l, int *out, int x, int z, int w, int h);
void mapHeatIce(Layer *l, int *out, int x, int z, int w, int h);
void mapSpecial(Layer *l, int *out, int x, int z, int w, int h);
void mapAddMushroomIsland(Layer *l, int *out, int x, int z, int w, int h);
void mapDeepOcean(Layer *l, int *out, int x, int z, int w, int h);
void mapBiome(Layer *l, int *out, int x, int z, int w, int h);
void mapRiverInit(Layer *l, int *out, int x, int z, int w, int h);
void mapBiomeEdge(Layer *l, int *out, int x, int z, int w, int h);
void mapHills(Layer *l, int *out, int x, int z, int w, int h);
void mapRiver(Layer *l, int *out, int x, int z, int w, int h);
void mapSmooth(Layer *l, int *out, int x, int z, int w, int h);
void mapRareBiome(Layer *l, int *out, int x, int z, int w, int h);
void mapShore(Layer *l, int *out, int x, int z, int w, int h);
void mapRiverMix(Layer *l, int *out, int x, int z, int w, int h);
void mapVoronoiZoom(Layer *l, int *out, int x, int z, int w, int h);
#endif /* LAYER_H_ */