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biomenoise.c
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biomenoise.c
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#include "biomenoise.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <float.h>
//==============================================================================
// Noise
//==============================================================================
void initSurfaceNoise(SurfaceNoise *sn, int dim, uint64_t seed)
{
uint64_t s;
setSeed(&s, seed);
octaveInit(&sn->octmin, &s, sn->oct+0, -15, 16);
octaveInit(&sn->octmax, &s, sn->oct+16, -15, 16);
octaveInit(&sn->octmain, &s, sn->oct+32, -7, 8);
if (dim == DIM_END)
{
sn->xzScale = 2.0;
sn->yScale = 1.0;
sn->xzFactor = 80;
sn->yFactor = 160;
}
else // DIM_OVERWORLD
{
octaveInit(&sn->octsurf, &s, sn->oct+40, -3, 4);
skipNextN(&s, 262*10);
octaveInit(&sn->octdepth, &s, sn->oct+44, -15, 16);
sn->xzScale = 0.9999999814507745;
sn->yScale = 0.9999999814507745;
sn->xzFactor = 80;
sn->yFactor = 160;
}
}
void initSurfaceNoiseBeta(SurfaceNoiseBeta *snb, uint64_t seed)
{
uint64_t s;
setSeed(&s, seed);
octaveInitBeta(&snb->octmin, &s, snb->oct+0, 16, 684.412, 0.5, 1.0, 2.0);
octaveInitBeta(&snb->octmax, &s, snb->oct+16, 16, 684.412, 0.5, 1.0, 2.0);
octaveInitBeta(&snb->octmain, &s, snb->oct+32, 8, 684.412/80.0, 0.5, 1.0, 2.0);
skipNextN(&s, 262*8);
octaveInitBeta(&snb->octcontA, &s, snb->oct+40, 10, 1.121, 0.5, 1.0, 2.0);
octaveInitBeta(&snb->octcontB, &s, snb->oct+50, 16, 200.0, 0.5, 1.0, 2.0);
}
double sampleSurfaceNoiseBetween(const SurfaceNoise *sn, int x, int y, int z,
double noiseMin, double noiseMax)
{
double persist, amp;
double dx, dy, dz, sy;
int i;
double xzScale = 684.412 * sn->xzScale;
double yScale = 684.412 * sn->yScale;
double vmin = 0;
double vmax = 0;
persist = 1.0 / 32768.0;
amp = 64.0;
for (i = 15; i >= 0; i--)
{
dx = x * xzScale * persist;
dz = z * xzScale * persist;
sy = yScale * persist;
dy = y * sy;
vmin += samplePerlin(&sn->octmin.octaves[i], dx, dy, dz, sy, dy) * amp;
vmax += samplePerlin(&sn->octmax.octaves[i], dx, dy, dz, sy, dy) * amp;
if (vmin - amp > noiseMax && vmax - amp > noiseMax)
return noiseMax;
if (vmin + amp < noiseMin && vmax + amp < noiseMin)
return noiseMin;
amp *= 0.5;
persist *= 2.0;
}
double xzStep = xzScale / sn->xzFactor;
double yStep = yScale / sn->yFactor;
double vmain = 0.5;
persist = 1.0 / 128.0;
amp = 0.05 * 128.0;
for (i = 7; i >= 0; i--)
{
dx = x * xzStep * persist;
dz = z * xzStep * persist;
sy = yStep * persist;
dy = y * sy;
vmain += samplePerlin(&sn->octmain.octaves[i], dx, dy, dz, sy, dy) * amp;
if (vmain - amp > 1) return vmax;
if (vmain + amp < 0) return vmin;
amp *= 0.5;
persist *= 2.0;
}
return clampedLerp(vmain, vmin, vmax);
}
double sampleSurfaceNoise(const SurfaceNoise *sn, int x, int y, int z)
{
double xzScale = 684.412 * sn->xzScale;
double yScale = 684.412 * sn->yScale;
double xzStep = xzScale / sn->xzFactor;
double yStep = yScale / sn->yFactor;
double minNoise = 0;
double maxNoise = 0;
double mainNoise = 0;
double persist = 1.0;
double contrib = 1.0;
double dx, dy, dz, sy, ty;
int i;
for (i = 0; i < 16; i++)
{
dx = maintainPrecision(x * xzScale * persist);
dy = maintainPrecision(y * yScale * persist);
dz = maintainPrecision(z * xzScale * persist);
sy = yScale * persist;
ty = y * sy;
minNoise += samplePerlin(&sn->octmin.octaves[i], dx, dy, dz, sy, ty) * contrib;
maxNoise += samplePerlin(&sn->octmax.octaves[i], dx, dy, dz, sy, ty) * contrib;
if (i < 8)
{
dx = maintainPrecision(x * xzStep * persist);
dy = maintainPrecision(y * yStep * persist);
dz = maintainPrecision(z * xzStep * persist);
sy = yStep * persist;
ty = y * sy;
mainNoise += samplePerlin(&sn->octmain.octaves[i], dx, dy, dz, sy, ty) * contrib;
}
persist *= 0.5;
contrib *= 2.0;
}
return clampedLerp(0.5 + 0.05*mainNoise, minNoise/512.0, maxNoise/512.0);
}
//==============================================================================
// Nether (1.16+) and End (1.9+) Biome Generation
//==============================================================================
void setNetherSeed(NetherNoise *nn, uint64_t seed)
{
uint64_t s;
setSeed(&s, seed);
doublePerlinInit(&nn->temperature, &s, &nn->oct[0], &nn->oct[2], -7, 2);
setSeed(&s, seed+1);
doublePerlinInit(&nn->humidity, &s, &nn->oct[4], &nn->oct[6], -7, 2);
}
/* Gets the 3D nether biome at scale 1:4 (for 1.16+).
*/
int getNetherBiome(const NetherNoise *nn, int x, int y, int z, float *ndel)
{
const float npoints[5][4] = {
{ 0, 0, 0, nether_wastes },
{ 0, -0.5, 0, soul_sand_valley },
{ 0.4, 0, 0, crimson_forest },
{ 0, 0.5, 0.375*0.375, warped_forest },
{-0.5, 0, 0.175*0.175, basalt_deltas },
};
y = 0;
float temp = sampleDoublePerlin(&nn->temperature, x, y, z);
float humidity = sampleDoublePerlin(&nn->humidity, x, y, z);
int i, id = 0;
float dmin = FLT_MAX;
float dmin2 = FLT_MAX;
for (i = 0; i < 5; i++)
{
float dx = npoints[i][0] - temp;
float dy = npoints[i][1] - humidity;
float dsq = dx*dx + dy*dy + npoints[i][2];
if (dsq < dmin)
{
dmin2 = dmin;
dmin = dsq;
id = i;
}
else if (dsq < dmin2)
dmin2 = dsq;
}
if (ndel)
*ndel = sqrtf(dmin2) - sqrtf(dmin);
id = (int) npoints[id][3];
return id;
}
static void fillRad3D(int *out, int x, int y, int z, int sx, int sy, int sz,
int id, float rad)
{
int r, rsq;
int i, j, k;
r = (int) (rad);
if (r <= 0)
return;
rsq = (int) floor(rad * rad);
for (k = -r; k <= r; k++)
{
int ak = y+k;
if (ak < 0 || ak >= sy)
continue;
int ksq = k*k;
int *yout = &out[(int64_t)ak*sx*sz];
for (j = -r; j <= r; j++)
{
int aj = z+j;
if (aj < 0 || aj >= sz)
continue;
int jksq = j*j + ksq;
for (i = -r; i <= r; i++)
{
int ai = x+i;
if (ai < 0 || ai >= sx)
continue;
int ijksq = i*i + jksq;
if (ijksq > rsq)
continue;
yout[(int64_t)aj*sx+ai] = id;
}
}
}
}
int mapNether3D(const NetherNoise *nn, int *out, Range r, float confidence)
{
int64_t i, j, k;
if (r.sy <= 0)
r.sy = 1;
if (r.scale <= 3)
{
printf("mapNether3D() invalid scale for this function\n");
return 1;
}
int scale = r.scale / 4;
memset(out, 0, sizeof(int) * r.sx*r.sy*r.sz);
// The noisedelta is the distance between the first and second closest
// biomes within the noise space. Dividing this by the greatest possible
// gradient (~0.05) gives a minimum diameter of voxels around the sample
// cell that will have the same biome.
float invgrad = 1.0 / (confidence * 0.05 * 2) / scale;
for (k = 0; k < r.sy; k++)
{
int *yout = &out[k*r.sx*r.sz];
for (j = 0; j < r.sz; j++)
{
for (i = 0; i < r.sx; i++)
{
if (yout[j*r.sx+i])
continue;
//yout[j*w+i] = getNetherBiome(nn, x+i, y+k, z+j, NULL);
//continue;
float noisedelta;
int xi = (r.x+i)*scale;
int yk = (r.y+k);
int zj = (r.z+j)*scale;
int v = getNetherBiome(nn, xi, yk, zj, &noisedelta);
yout[j*r.sx+i] = v;
float cellrad = noisedelta * invgrad;
fillRad3D(out, i, j, k, r.sx, r.sy, r.sz, v, cellrad);
}
}
}
return 0;
}
int mapNether2D(const NetherNoise *nn, int *out, int x, int z, int w, int h)
{
Range r = {4, x, z, w, h, 0, 1};
return mapNether3D(nn, out, r, 1.0);
}
int genNetherScaled(const NetherNoise *nn, int *out, Range r, int mc, uint64_t sha)
{
if (r.scale <= 0) r.scale = 4;
if (r.sy == 0) r.sy = 1;
uint64_t siz = (uint64_t)r.sx*r.sy*r.sz;
if (mc <= MC_1_15)
{
uint64_t i;
for (i = 0; i < siz; i++)
out[i] = nether_wastes;
return 0;
}
if (r.scale == 1)
{
Range s = getVoronoiSrcRange(r);
int *src;
if (siz > 1)
{ // the source range is large enough that we can try optimizing
src = out + siz;
int err = mapNether3D(nn, src, s, 1.0);
if (err)
return err;
}
else
{
src = NULL;
}
int i, j, k;
int *p = out;
for (k = 0; k < r.sy; k++)
{
for (j = 0; j < r.sz; j++)
{
for (i = 0; i < r.sx; i++)
{
int x4, z4, y4;
voronoiAccess3D(sha, r.x+i, r.y+k, r.z+j, &x4, &y4, &z4);
if (src)
{
x4 -= s.x; y4 -= s.y; z4 -= s.z;
*p = src[(int64_t)y4*s.sx*s.sz + (int64_t)z4*s.sx + x4];
}
else
{
*p = getNetherBiome(nn, x4, y4, z4, NULL);
}
p++;
}
}
}
return 0;
}
else
{
return mapNether3D(nn, out, r, 1.0);
}
}
void setEndSeed(EndNoise *en, int mc, uint64_t seed)
{
uint64_t s;
setSeed(&s, seed);
skipNextN(&s, 17292);
perlinInit(&en->perlin, &s);
en->mc = mc;
}
static int getEndBiome(int hx, int hz, const uint16_t *hmap, int hw)
{
int i, j;
const uint16_t ds[26] = { // (25-2*i)*(25-2*i)
// 0 1 2 3 4 5 6 7 8 9 10 11 12
625, 529, 441, 361, 289, 225, 169, 121, 81, 49, 25, 9, 1,
// 13 14 15 16 17 18 19 20 21 22 23 24, 25
1, 9, 25, 49, 81, 121, 169, 225, 289, 361, 441, 529, 625,
};
const uint16_t *p_dsi = ds + (hx < 0);
const uint16_t *p_dsj = ds + (hz < 0);
const uint16_t *p_elev = hmap;
uint32_t h;
if (abs(hx) <= 15 && abs(hz) <= 15)
h = 64 * (hx*hx + hz*hz);
else
h = 14401;
for (j = 0; j < 25; j++)
{
uint16_t dsj = p_dsj[j];
uint16_t e;
uint32_t u;
// force unroll for(i=0;i<25;i++) in a cross compatible way
#define x5(i,x) { x; i++; x; i++; x; i++; x; i++; x; i++; }
#define for25(i,x) { i = 0; x5(i,x) x5(i,x) x5(i,x) x5(i,x) x5(i,x) }
for25(i,
if unlikely(e = p_elev[i])
{
if ((u = (p_dsi[i] + (uint32_t)dsj) * e) < h)
h = u;
}
);
#undef for25
#undef x5
p_elev += hw;
}
if (h < 3600)
return end_highlands;
else if (h <= 10000)
return end_midlands;
else if (h <= 14400)
return end_barrens;
return small_end_islands;
}
int mapEndBiome(const EndNoise *en, int *out, int x, int z, int w, int h)
{
int64_t i, j;
int64_t hw = w + 26;
int64_t hh = h + 26;
uint16_t *hmap = (uint16_t*) malloc(sizeof(*hmap) * hw * hh);
for (j = 0; j < hh; j++)
{
for (i = 0; i < hw; i++)
{
int64_t rx = x + i - 12;
int64_t rz = z + j - 12;
uint64_t rsq = rx * rx + rz * rz;
uint16_t v = 0;
if (rsq > 4096 && sampleSimplex2D(&en->perlin, rx, rz) < -0.9f)
{
//v = (llabs(rx) * 3439 + llabs(rz) * 147) % 13 + 9;
v = (unsigned int)(
fabsf((float)rx) * 3439.0f + fabsf((float)rz) * 147.0f
) % 13 + 9;
v *= v;
}
hmap[(int64_t)j*hw+i] = v;
}
}
for (j = 0; j < h; j++)
{
for (i = 0; i < w; i++)
{
int64_t hx = (i+x);
int64_t hz = (j+z);
uint64_t rsq = hx * hx + hz * hz;
if (rsq <= 4096L)
out[j*w+i] = the_end;
else
{
hx = 2*hx + 1;
hz = 2*hz + 1;
if (en->mc > MC_1_13)
{ // add outer end rings
rsq = hx * hx + hz * hz;
if ((int)rsq < 0)
{
out[j*w+i] = end_barrens;
continue;
}
}
uint16_t *p_elev = &hmap[(hz/2-z)*hw + (hx/2-x)];
out[j*w+i] = getEndBiome(hx, hz, p_elev, hw);
}
}
}
free(hmap);
return 0;
}
int mapEnd(const EndNoise *en, int *out, int x, int z, int w, int h)
{
int cx = x >> 2;
int cz = z >> 2;
int64_t cw = ((x+w) >> 2) + 1 - cx;
int64_t ch = ((z+h) >> 2) + 1 - cz;
int *buf = (int*) malloc(sizeof(int) * cw * ch);
mapEndBiome(en, buf, cx, cz, cw, ch);
int i, j;
for (j = 0; j < h; j++)
{
int cj = ((z+j) >> 2) - cz;
for (i = 0; i < w; i++)
{
int ci = ((x+i) >> 2) - cx;
int v = buf[cj*cw+ci];
out[j*w+i] = v;
}
}
free(buf);
return 0;
}
/* Samples the End height. The coordinates used here represent eight blocks per
* cell. By default a range of 12 cells is sampled, which can be overriden for
* optimization purposes.
*/
float getEndHeightNoise(const EndNoise *en, int x, int z, int range)
{
int hx = x / 2;
int hz = z / 2;
int oddx = x % 2;
int oddz = z % 2;
int i, j;
int64_t h = 64 * (x*(int64_t)x + z*(int64_t)z);
if (range == 0)
range = 12;
for (j = -range; j <= range; j++)
{
for (i = -range; i <= range; i++)
{
int64_t rx = hx + i;
int64_t rz = hz + j;
uint64_t rsq = rx*rx + rz*rz;
uint16_t v = 0;
if (rsq > 4096 && sampleSimplex2D(&en->perlin, rx, rz) < -0.9f)
{
//v = (llabs(rx) * 3439 + llabs(rz) * 147) % 13 + 9;
v = (unsigned int)(
fabsf((float)rx) * 3439.0f + fabsf((float)rz) * 147.0f
) % 13 + 9;
rx = (oddx - i * 2);
rz = (oddz - j * 2);
rsq = rx*rx + rz*rz;
int64_t noise = rsq * v*v;
if (noise < h)
h = noise;
}
}
}
float ret = 100 - sqrtf((float) h);
if (ret < -100) ret = -100;
if (ret > 80) ret = 80;
return ret;
}
void sampleNoiseColumnEnd(double column[],
const SurfaceNoise *sn, const EndNoise *en, int x, int z,
int colymin, int colymax)
{
// clamped (32 + 46 - y) / 64.0
static const double upper_drop[] = {
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, // 0-7
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 63./64, // 8-15
62./64, 61./64, 60./64, 59./64, 58./64, 57./64, 56./64, 55./64, // 16-23
54./64, 53./64, 52./64, 51./64, 50./64, 49./64, 48./64, 47./64, // 24-31
46./64 // 32
};
// clamped (y - 1) / 7.0
static const double lower_drop[] = {
0.0, 0.0, 1./7, 2./7, 3./7, 4./7, 5./7, 6./7, // 0-7
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, // 8-15
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, // 16-23
1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, // 24-31
1.0, // 32
};
int y;
if (en->mc > MC_1_13)
{ // add outer end rings
uint64_t rsq = (uint64_t) x * x + (uint64_t) z * z;
if ((int)rsq < 0)
{
for (y = colymin; y <= colymax; y++)
column[y - colymin] = nan("");
return;
}
}
// depth is between [-108, +72]
// noise is between [-128, +128]
// for a sold block we need the upper drop as:
// (72 + 128) * u - 3000 * (1-u) > 0 => upper_drop = u < 15/16
// which occurs at y = 18 for the highest relevant noise cell
// for the lower drop we need:
// (72 + 128) * l - 30 * (1-l) > 0 => lower_drop = l > 3/23
// which occurs at y = 3 for the lowest relevant noise cell
double depth = getEndHeightNoise(en, x, z, 0) - 8.0f;
for (y = colymin; y <= colymax; y++)
{
if (lower_drop[y] == 0.0) {
column[y - colymin] = -30;
continue;
}
double noise = sampleSurfaceNoiseBetween(sn, x, y, z, -128, +128);
double clamped = noise + depth;
clamped = lerp(upper_drop[y], -3000, clamped);
clamped = lerp(lower_drop[y], -30, clamped);
column[y - colymin] = clamped;
}
}
/* Given bordering noise columns and a fractional position between those,
* determine the surface block height (i.e. where the interpolated noise > 0).
* Note that the noise columns should be of size: ncolxz[ colymax-colymin+1 ]
*/
int getSurfaceHeight(
const double ncol00[], const double ncol01[],
const double ncol10[], const double ncol11[],
int colymin, int colymax, int blockspercell, double dx, double dz)
{
int y, celly;
for (celly = colymax-1; celly >= colymin; celly--)
{
int idx = celly - colymin;
double v000 = ncol00[idx];
double v001 = ncol01[idx];
double v100 = ncol10[idx];
double v101 = ncol11[idx];
double v010 = ncol00[idx+1];
double v011 = ncol01[idx+1];
double v110 = ncol10[idx+1];
double v111 = ncol11[idx+1];
for (y = blockspercell - 1; y >= 0; y--)
{
double dy = y / (double) blockspercell;
double noise = lerp3(dy, dx, dz, // Note: not x, y, z
v000, v010, v100, v110,
v001, v011, v101, v111);
if (noise > 0)
return celly * blockspercell + y;
}
}
return 0;
}
int getEndSurfaceHeight(int mc, uint64_t seed, int x, int z)
{
EndNoise en;
setEndSeed(&en, mc, seed);
SurfaceNoise sn;
initSurfaceNoise(&sn, DIM_END, seed);
// end noise columns vary on a grid of cell size = eight
int cellx = (x >> 3);
int cellz = (z >> 3);
double dx = (x & 7) / 8.0;
double dz = (z & 7) / 8.0;
// abusing enum for local compile time constants rather than enumeration
enum { y0 = 0, y1 = 32, yn = y1-y0+1 };
double ncol00[yn];
double ncol01[yn];
double ncol10[yn];
double ncol11[yn];
sampleNoiseColumnEnd(ncol00, &sn, &en, cellx, cellz, y0, y1);
sampleNoiseColumnEnd(ncol01, &sn, &en, cellx, cellz+1, y0, y1);
sampleNoiseColumnEnd(ncol10, &sn, &en, cellx+1, cellz, y0, y1);
sampleNoiseColumnEnd(ncol11, &sn, &en, cellx+1, cellz+1, y0, y1);
return getSurfaceHeight(ncol00, ncol01, ncol10, ncol11, y0, y1, 4, dx, dz);
}
int mapEndSurfaceHeight(float *y, const EndNoise *en, const SurfaceNoise *sn,
int x, int z, int w, int h, int scale, int ymin)
{
if (scale != 1 && scale != 2 && scale != 4 && scale != 8)
return 1;
int y0 = ymin >> 2;
if (y0 < 2) y0 = 2;
if (y0 > 17) y0 = 17;
int y1 = 18;
int yn = y1 - y0 + 1;
double cellmid = scale > 1 ? scale / 16.0 : 0;
int cellsiz = 8 / scale;
int cx = floordiv(x, cellsiz);
int cz = floordiv(z, cellsiz);
int cw = floordiv(x + w - 1, cellsiz) - cx + 2;
int i, j;
double *buf = malloc(sizeof(double) * yn * cw * 2);
double *ncol[2];
ncol[0] = buf;
ncol[1] = buf + yn * cw;
for (i = 0; i < cw; i++)
sampleNoiseColumnEnd(ncol[1]+i*yn, sn, en, cx+i, cz+0, y0, y1);
for (j = 0; j < h; j++)
{
int cj = floordiv(z + j, cellsiz);
int dj = z + j - cj * cellsiz;
if (j == 0 || dj == 0)
{
double *tmp = ncol[0];
ncol[0] = ncol[1];
ncol[1] = tmp;
for (i = 0; i < cw; i++)
sampleNoiseColumnEnd(ncol[1]+i*yn, sn, en, cx+i, cj+1, y0, y1);
}
for (i = 0; i < w; i++)
{
int ci = floordiv(x + i, cellsiz);
int di = x + i - ci * cellsiz;
double dx = di / (double) cellsiz + cellmid;
double dz = dj / (double) cellsiz + cellmid;
double *ncol0 = ncol[0] + (ci - cx) * yn;
double *ncol1 = ncol[1] + (ci - cx) * yn;
y[j*w+i] = getSurfaceHeight(ncol0, ncol1, ncol0+yn, ncol1+yn,
y0, y1, 4, dx, dz);
}
}
free(buf);
return 0;
}
int genEndScaled(const EndNoise *en, int *out, Range r, int mc, uint64_t sha)
{
if (mc < MC_1_0)
return 1;
if (r.sy == 0)
r.sy = 1;
if (mc <= MC_1_8)
{
uint64_t i, siz = (uint64_t)r.sx*r.sy*r.sz;
for (i = 0; i < siz; i++)
out[i] = the_end;
return 0;
}
int err, iy;
if (r.scale == 1)
{
Range s = getVoronoiSrcRange(r);
err = mapEnd(en, out, s.x, s.z, s.sx, s.sz);
if (err) return err;
if (mc <= MC_1_14)
{ // up to 1.14 voronoi noise is planar
Layer lvoronoi;
memset(&lvoronoi, 0, sizeof(Layer));
lvoronoi.startSalt = getLayerSalt(10);
err = mapVoronoi114(&lvoronoi, out, r.x, r.z, r.sx, r.sz);
if (err) return err;
}
else
{ // in 1.15 voronoi noise varies vertically in the End
int *src = out + (int64_t)r.sx*r.sy*r.sz;
memmove(src, out, sizeof(int)*s.sx*s.sz);
for (iy = 0; iy < r.sy; iy++)
{
mapVoronoiPlane(
sha, out+r.sx*r.sz*iy, src,
r.x,r.z,r.sx,r.sz, r.y+iy,
s.x,s.z,s.sx,s.sz);
}
return 0; // 3D expansion is done => return
}
}
else if (r.scale == 4)
{
err = mapEnd(en, out, r.x, r.z, r.sx, r.sz);
if (err) return err;
}
else if (r.scale == 16)
{
err = mapEndBiome(en, out, r.x, r.z, r.sx, r.sz);
if (err) return err;
}
else
{
float d = r.scale / 8.0;
int i, j;
for (j = 0; j < r.sz; j++)
{
for (i = 0; i < r.sx; i++)
{
int64_t hx = (int64_t)((i+r.x) * d);
int64_t hz = (int64_t)((j+r.z) * d);
uint64_t rsq = hx*hx + hz*hz;
if (rsq <= 16384L)
{
out[j*r.sx+i] = the_end;
continue;
}
else if (mc > MC_1_13 && (int)(rsq) < 0)
{
out[j*r.sx+i] = end_barrens;
continue;
}
float h = getEndHeightNoise(en, hx, hz, 4);
if (h > 40)
out[j*r.sx+i] = end_highlands;
else if (h >= 0)
out[j*r.sx+i] = end_midlands;
else if (h >= -20)
out[j*r.sx+i] = end_barrens;
else
out[j*r.sx+i] = small_end_islands;
}
}
}
// expanding 2D into 3D
for (iy = 1; iy < r.sy; iy++)
{
int64_t i, siz = (int64_t)r.sx*r.sz;
for (i = 0; i < siz; i++)
out[iy*siz + i] = out[i];
}
return 0;
}
//==============================================================================
// Overworld and Nether Biome Generation 1.18
//==============================================================================
static int init_climate_seed(
DoublePerlinNoise *dpn, PerlinNoise *oct,
uint64_t xlo, uint64_t xhi, int large, int nptype, int nmax
)
{
Xoroshiro pxr;
int n = 0;
switch (nptype)
{
case NP_SHIFT: {
static const double amp[] = {1, 1, 1, 0};
// md5 "minecraft:offset"
pxr.lo = xlo ^ 0x080518cf6af25384;
pxr.hi = xhi ^ 0x3f3dfb40a54febd5;
n += xDoublePerlinInit(dpn, &pxr, oct, amp, -3, 4, nmax);
} break;
case NP_TEMPERATURE: {
static const double amp[] = {1.5, 0, 1, 0, 0, 0};
// md5 "minecraft:temperature" or "minecraft:temperature_large"
pxr.lo = xlo ^ (large ? 0x944b0073edf549db : 0x5c7e6b29735f0d7f);
pxr.hi = xhi ^ (large ? 0x4ff44347e9d22b96 : 0xf7d86f1bbc734988);
n += xDoublePerlinInit(dpn, &pxr, oct, amp, large ? -12 : -10, 6, nmax);
} break;
case NP_HUMIDITY: {
static const double amp[] = {1, 1, 0, 0, 0, 0};
// md5 "minecraft:vegetation" or "minecraft:vegetation_large"
pxr.lo = xlo ^ (large ? 0x71b8ab943dbd5301 : 0x81bb4d22e8dc168e);
pxr.hi = xhi ^ (large ? 0xbb63ddcf39ff7a2b : 0xf1c8b4bea16303cd);
n += xDoublePerlinInit(dpn, &pxr, oct, amp, large ? -10 : -8, 6, nmax);
} break;
case NP_CONTINENTALNESS: {
static const double amp[] = {1, 1, 2, 2, 2, 1, 1, 1, 1};
// md5 "minecraft:continentalness" or "minecraft:continentalness_large"
pxr.lo = xlo ^ (large ? 0x9a3f51a113fce8dc : 0x83886c9d0ae3a662);
pxr.hi = xhi ^ (large ? 0xee2dbd157e5dcdad : 0xafa638a61b42e8ad);
n += xDoublePerlinInit(dpn, &pxr, oct, amp, large ? -11 : -9, 9, nmax);
} break;
case NP_EROSION: {
static const double amp[] = {1, 1, 0, 1, 1};
// md5 "minecraft:erosion" or "minecraft:erosion_large"
pxr.lo = xlo ^ (large ? 0x8c984b1f8702a951 : 0xd02491e6058f6fd8);
pxr.hi = xhi ^ (large ? 0xead7b1f92bae535f : 0x4792512c94c17a80);
n += xDoublePerlinInit(dpn, &pxr, oct, amp, large ? -11 : -9, 5, nmax);
} break;
case NP_WEIRDNESS: {
static const double amp[] = {1, 2, 1, 0, 0, 0};
// md5 "minecraft:ridge"
pxr.lo = xlo ^ 0xefc8ef4d36102b34;
pxr.hi = xhi ^ 0x1beeeb324a0f24ea;
n += xDoublePerlinInit(dpn, &pxr, oct, amp, -7, 6, nmax);
} break;
default:
printf("unsupported climate parameter %d\n", nptype);
exit(1);
}
return n;
}
void setBiomeSeed(BiomeNoise *bn, uint64_t seed, int large)
{
Xoroshiro pxr;
xSetSeed(&pxr, seed);
uint64_t xlo = xNextLong(&pxr);
uint64_t xhi = xNextLong(&pxr);
int n = 0, i = 0;
for (; i < NP_MAX; i++)
n += init_climate_seed(&bn->climate[i], bn->oct+n, xlo, xhi, large, i, -1);
if ((size_t)n > sizeof(bn->oct) / sizeof(*bn->oct))
{
printf("setBiomeSeed(): BiomeNoise is malformed, buffer too small\n");
exit(1);
}
bn->nptype = -1;
}
void setBetaBiomeSeed(BiomeNoiseBeta *bnb, uint64_t seed)
{
uint64_t seedScratch;
setSeed(&seedScratch, seed*9871);
octaveInitBeta(bnb->climate, &seedScratch, bnb->oct,
4, 0.025/1.5, 0.25, 0.55, 2.0);
setSeed(&seedScratch, seed*39811);
octaveInitBeta(bnb->climate+1, &seedScratch, bnb->oct+4,
4, 0.05/1.5, 1./3, 0.55, 2.0);
setSeed(&seedScratch, seed*0x84a59L);
octaveInitBeta(bnb->climate+2, &seedScratch, bnb->oct+8,
2, 0.25/1.5, 10./17, 0.55, 2.0);
bnb->nptype = -1;
}
enum { SP_CONTINENTALNESS, SP_EROSION, SP_RIDGES, SP_WEIRDNESS };
static void addSplineVal(Spline *rsp, float loc, Spline *val, float der)
{
rsp->loc[rsp->len] = loc;
rsp->val[rsp->len] = val;
rsp->der[rsp->len] = der;
rsp->len++;
//if (rsp->len > 12) {
// printf("addSplineVal(): too many spline points\n");
// exit(1);
//}
}
static Spline *createFixSpline(SplineStack *ss, float val)
{
FixSpline *sp = &ss->fstack[ss->flen++];
sp->len = 1;
sp->val = val;
return (Spline*)sp;
}
static float getOffsetValue(float weirdness, float continentalness)
{
float f0 = 1.0F - (1.0F - continentalness) * 0.5F;
float f1 = 0.5F * (1.0F - continentalness);
float f2 = (weirdness + 1.17F) * 0.46082947F;
float off = f2 * f0 - f1;
if (weirdness < -0.7F)
return off > -0.2222F ? off : -0.2222F;
else
return off > 0 ? off : 0;
}
static Spline *createSpline_38219(SplineStack *ss, float f, int bl)
{
Spline *sp = &ss->stack[ss->len++];
sp->typ = SP_RIDGES;
float i = getOffsetValue(-1.0F, f);
float k = getOffsetValue( 1.0F, f);
float l = 1.0F - (1.0F - f) * 0.5F;
float u = 0.5F * (1.0F - f);
l = u / (0.46082947F * l) - 1.17F;
if (-0.65F < l && l < 1.0F)
{
float p, q, r, s;
u = getOffsetValue(-0.65F, f);
p = getOffsetValue(-0.75F, f);
q = (p - i) * 4.0F;
r = getOffsetValue(l, f);
s = (k - r) / (1.0F - l);
addSplineVal(sp, -1.0F, createFixSpline(ss, i), q);
addSplineVal(sp, -0.75F, createFixSpline(ss, p), 0);
addSplineVal(sp, -0.65F, createFixSpline(ss, u), 0);
addSplineVal(sp, l-0.01F, createFixSpline(ss, r), 0);
addSplineVal(sp, l, createFixSpline(ss, r), s);
addSplineVal(sp, 1.0F, createFixSpline(ss, k), s);
}
else
{