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225
noise.h
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225
noise.h
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static const double noise_d3x[] = { 1.0D, -1.0D, 1.0D, -1.0D, 1.0D, -1.0D, 1.0D, -1.0D, 0.0D, 0.0D, 0.0D, 0.0D, 1.0D, 0.0D, -1.0D, 0.0D };
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static const double noise_d3y[] = { 1.0D, 1.0D, -1.0D, -1.0D, 0.0D, 0.0D, 0.0D, 0.0D, 1.0D, -1.0D, 1.0D, -1.0D, 1.0D, -1.0D, 1.0D, -1.0D };
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static const double noise_d3z[] = { 0.0D, 0.0D, 0.0D, 0.0D, 1.0D, 1.0D, -1.0D, -1.0D, 1.0D, 1.0D, -1.0D, -1.0D, 0.0D, 1.0D, 0.0D, -1.0D };
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static const double noise_d2x[] = { 1.0D, -1.0D, 1.0D, -1.0D, 1.0D, -1.0D, 1.0D, -1.0D, 0.0D, 0.0D, 0.0D, 0.0D, 1.0D, 0.0D, -1.0D, 0.0D };
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static const double noise_d2z[] = { 0.0D, 0.0D, 0.0D, 0.0D, 1.0D, 1.0D, -1.0D, -1.0D, 1.0D, 1.0D, -1.0D, -1.0D, 0.0D, 1.0D, 0.0D, -1.0D };
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typedef struct {
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int permutations[512];
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double xcoord;
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double ycoord;
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double zcoord;
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} octave_t;
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typedef struct {
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octave_t *octaves;
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uint n_octaves;
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} noisegen_t;
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void noise_oct_init(octave_t *oct, ulong *rand) {
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memset(oct->permutations, 0, 512 * sizeof(int));
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oct->xcoord = rng_double(rand) * 256.0D;
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oct->ycoord = rng_double(rand) * 256.0D;
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oct->zcoord = rng_double(rand) * 256.0D;
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for(int n = 0; n < 256; oct->permutations[n] = n++) {
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;
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}
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for(int n = 0; n < 256; ++n) {
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int pos = rng_zrange(rand, 256 - n) + n;
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int value = oct->permutations[n];
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oct->permutations[n] = oct->permutations[pos];
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oct->permutations[pos] = value;
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oct->permutations[n + 256] = oct->permutations[n];
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}
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}
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void noise_gen_init(noisegen_t *gen, ulong *rand, int octs) {
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gen->n_octaves = octs;
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gen->octaves = mem_alloc(octs * sizeof(octave_t), MEM_MISC);
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for(int n = 0; n < octs; ++n) {
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noise_oct_init(&gen->octaves[n], rand);
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}
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}
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void noise_gen_free(noisegen_t *gen) {
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if(gen->octaves)
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mem_free(gen->octaves);
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gen->octaves = NULL;
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gen->n_octaves = 0;
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}
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double noise_lerp(double d, double n, double m) {
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return n + d * (m - n);
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}
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double noise_grad2d(int n, double xm, double zm) {
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int i = n & 15;
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return noise_d2x[i] * xm + noise_d2z[i] * zm;
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}
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double noise_grad(int n, double xm, double ym, double zm) {
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int i = n & 15;
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return noise_d3x[i] * xm + noise_d3y[i] * ym + noise_d3z[i] * zm;
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}
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long noise_floor_double(double value) {
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long i = (long)value;
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return value < (double)i ? i - 1L : i;
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}
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void noise_oct_gen(octave_t *oct, double *noise, double xoff, double yoff, double zoff, int xsize, int ysize, int zsize,
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double xscale, double yscale, double zscale, double scale) {
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int *permutations = oct->permutations;
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double xcoord = oct->xcoord;
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double ycoord = oct->ycoord;
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double zcoord = oct->zcoord;
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if(ysize == 1) {
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int i5 = 0;
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int j5 = 0;
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int j = 0;
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int k5 = 0;
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double d14 = 0.0D;
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double d15 = 0.0D;
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int l5 = 0;
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double d16 = 1.0D / scale;
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for(int j2 = 0; j2 < xsize; ++j2) {
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double d17 = xoff + (double)j2 * xscale + xcoord;
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int i6 = (int)d17;
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if(d17 < (double)i6) {
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--i6;
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}
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int k2 = i6 & 255;
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d17 = d17 - (double)i6;
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double d18 = d17 * d17 * d17 * (d17 * (d17 * 6.0D - 15.0D) + 10.0D);
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for(int j6 = 0; j6 < zsize; ++j6) {
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double d19 = zoff + (double)j6 * zscale + zcoord;
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int k6 = (int)d19;
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if(d19 < (double)k6) {
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--k6;
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}
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int l6 = k6 & 255;
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d19 = d19 - (double)k6;
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double d20 = d19 * d19 * d19 * (d19 * (d19 * 6.0D - 15.0D) + 10.0D);
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i5 = permutations[k2] + 0;
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j5 = permutations[i5] + l6;
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j = permutations[k2 + 1] + 0;
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k5 = permutations[j] + l6;
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d14 = noise_lerp(d18, noise_grad2d(permutations[j5], d17, d19), noise_grad(permutations[k5], d17 - 1.0D, 0.0D, d19));
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d15 = noise_lerp(d18, noise_grad(permutations[j5 + 1], d17, 0.0D, d19 - 1.0D),
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noise_grad(permutations[k5 + 1], d17 - 1.0D, 0.0D, d19 - 1.0D));
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double d21 = noise_lerp(d20, d14, d15);
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int i7 = l5++;
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noise[i7] += d21 * d16;
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}
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}
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}
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else {
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int i = 0;
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double d0 = 1.0D / scale;
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int k = -1;
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int l = 0;
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int i1 = 0;
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int j1 = 0;
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int k1 = 0;
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int l1 = 0;
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int i2 = 0;
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double d1 = 0.0D;
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double d2 = 0.0D;
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double d3 = 0.0D;
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double d4 = 0.0D;
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for(int l2 = 0; l2 < xsize; ++l2) {
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double d5 = xoff + (double)l2 * xscale + xcoord;
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int i3 = (int)d5;
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if(d5 < (double)i3) {
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--i3;
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}
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int j3 = i3 & 255;
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d5 = d5 - (double)i3;
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double d6 = d5 * d5 * d5 * (d5 * (d5 * 6.0D - 15.0D) + 10.0D);
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for(int k3 = 0; k3 < zsize; ++k3) {
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double d7 = zoff + (double)k3 * zscale + zcoord;
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int l3 = (int)d7;
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if(d7 < (double)l3) {
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--l3;
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}
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int i4 = l3 & 255;
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d7 = d7 - (double)l3;
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double d8 = d7 * d7 * d7 * (d7 * (d7 * 6.0D - 15.0D) + 10.0D);
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for(int j4 = 0; j4 < ysize; ++j4) {
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double d9 = yoff + (double)j4 * yscale + ycoord;
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int k4 = (int)d9;
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if(d9 < (double)k4) {
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--k4;
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}
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int l4 = k4 & 255;
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d9 = d9 - (double)k4;
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double d10 = d9 * d9 * d9 * (d9 * (d9 * 6.0D - 15.0D) + 10.0D);
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if(j4 == 0 || l4 != k) {
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k = l4;
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l = permutations[j3] + l4;
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i1 = permutations[l] + i4;
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j1 = permutations[l + 1] + i4;
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k1 = permutations[j3 + 1] + l4;
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l1 = permutations[k1] + i4;
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i2 = permutations[k1 + 1] + i4;
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d1 = noise_lerp(d6, noise_grad(permutations[i1], d5, d9, d7), noise_grad(permutations[l1], d5 - 1.0D, d9, d7));
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d2 = noise_lerp(d6, noise_grad(permutations[j1], d5, d9 - 1.0D, d7),
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noise_grad(permutations[i2], d5 - 1.0D, d9 - 1.0D, d7));
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d3 = noise_lerp(d6, noise_grad(permutations[i1 + 1], d5, d9, d7 - 1.0D),
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noise_grad(permutations[l1 + 1], d5 - 1.0D, d9, d7 - 1.0D));
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d4 = noise_lerp(d6, noise_grad(permutations[j1 + 1], d5, d9 - 1.0D, d7 - 1.0D),
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noise_grad(permutations[i2 + 1], d5 - 1.0D, d9 - 1.0D, d7 - 1.0D));
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}
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double d11 = noise_lerp(d10, d1, d2);
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double d12 = noise_lerp(d10, d3, d4);
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double d13 = noise_lerp(d8, d11, d12);
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int j7 = i++;
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noise[j7] += d13 * d0;
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}
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}
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}
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}
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}
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void noise_gen(noisegen_t *gen, double *noise, double xoff, double yoff, double zoff, int xsize, int ysize, int zsize,
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double xscale, double yscale, double zscale) {
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memset(noise, 0, sizeof(double) * xsize * ysize * zsize);
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uint octaves = gen->n_octaves;
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double factor = 1.0D;
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for(int n = 0; n < octaves; ++n) {
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double xo = xoff * factor * xscale;
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double yo = yoff * factor * yscale;
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double zo = zoff * factor * zscale;
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long xn = noise_floor_double(xo);
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long zn = noise_floor_double(zo);
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xo = xo - (double)xn;
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zo = zo - (double)zn;
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xn = xn % 16777216L;
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zn = zn % 16777216L;
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xo = xo + (double)xn;
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zo = zo + (double)zn;
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noise_oct_gen(&gen->octaves[n], noise, xo, yo, zo, xsize, ysize, zsize, xscale * factor, yscale * factor, zscale * factor, factor);
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factor /= 2.0D;
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}
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}
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