forked from Mirrorlandia_minetest/minetest
Optimize noise implementations
This commit is contained in:
kwolekr
parent
0183c05ee0
commit
2a7c6d27b3
189
src/noise.cpp
189
src/noise.cpp
@ -83,7 +83,7 @@ float noise3d(int x, int y, int z, int seed)
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}
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float dotProduct(float vx, float vy, float wx, float wy)
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inline float dotProduct(float vx, float vy, float wx, float wy)
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{
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return vx * wx + vy * wy;
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}
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@ -95,38 +95,35 @@ inline float linearInterpolation(float v0, float v1, float t)
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}
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float biLinearInterpolation(
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inline float biLinearInterpolation(
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float v00, float v10,
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float v01, float v11,
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float x, float y)
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{
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float tx = easeCurve(x);
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float ty = easeCurve(y);
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#if 0
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return (
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v00 * (1 - tx) * (1 - ty) +
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v10 * tx * (1 - ty) +
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v01 * (1 - tx) * ty +
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v11 * tx * ty
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);
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//float u = linearInterpolation(v00, v10, x);
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//float v = linearInterpolation(v01, v11, x);
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//return linearInterpolation(u, v, y);
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#endif
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float u = linearInterpolation(v00, v10, tx);
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float v = linearInterpolation(v01, v11, tx);
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return linearInterpolation(u, v, ty);
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}
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float biLinearInterpolationNoEase(
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inline float biLinearInterpolationNoEase(
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float v00, float v10,
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float v01, float v11,
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float x, float y)
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{
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float tx = x;
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float ty = y;
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return (
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v00 * (1 - tx) * (1 - ty) +
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v10 * tx * (1 - ty) +
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v01 * (1 - tx) * ty +
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v11 * tx * ty
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);
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float u = linearInterpolation(v00, v10, x);
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float v = linearInterpolation(v01, v11, x);
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return linearInterpolation(u, v, y);
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}
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@ -138,6 +135,7 @@ float triLinearInterpolation(
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float tx = easeCurve(x);
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float ty = easeCurve(y);
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float tz = easeCurve(z);
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#if 0
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return (
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v000 * (1 - tx) * (1 - ty) * (1 - tz) +
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v100 * tx * (1 - ty) * (1 - tz) +
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@ -148,9 +146,10 @@ float triLinearInterpolation(
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v011 * (1 - tx) * ty * tz +
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v111 * tx * ty * tz
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);
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//float u = biLinearInterpolation(v000, v100, v010, v110, x, y);
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//float v = biLinearInterpolation(v001, v101, v011, v111, x, y);
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//return linearInterpolation(u, v, z);
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#endif
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float u = biLinearInterpolationNoEase(v000, v100, v010, v110, tx, ty);
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float v = biLinearInterpolationNoEase(v001, v101, v011, v111, tx, ty);
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return linearInterpolation(u, v, tz);
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}
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float triLinearInterpolationNoEase(
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@ -158,19 +157,9 @@ float triLinearInterpolationNoEase(
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float v001, float v101, float v011, float v111,
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float x, float y, float z)
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{
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float tx = x;
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float ty = y;
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float tz = z;
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return (
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v000 * (1 - tx) * (1 - ty) * (1 - tz) +
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v100 * tx * (1 - ty) * (1 - tz) +
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v010 * (1 - tx) * ty * (1 - tz) +
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v110 * tx * ty * (1 - tz) +
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v001 * (1 - tx) * (1 - ty) * tz +
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v101 * tx * (1 - ty) * tz +
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v011 * (1 - tx) * ty * tz +
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v111 * tx * ty * tz
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);
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float u = biLinearInterpolationNoEase(v000, v100, v010, v110, x, y);
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float v = biLinearInterpolationNoEase(v001, v101, v011, v111, x, y);
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return linearInterpolation(u, v, z);
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}
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@ -336,29 +325,46 @@ Noise::Noise(NoiseParams *np, int seed, int sx, int sy, int sz)
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this->sy = sy;
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this->sz = sz;
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this->noisebuf = NULL;
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this->persist_buf = NULL;
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this->gradient_buf = NULL;
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this->result = NULL;
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if (np->flags & NOISE_FLAG_DEFAULTS) {
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// By default, only 2d noise is eased.
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if (sz == 1)
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if (sz <= 1)
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np->flags |= NOISE_FLAG_EASED;
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}
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resizeNoiseBuf(sz > 1);
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try {
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this->buf = new float[sx * sy * sz];
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this->result = new float[sx * sy * sz];
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} catch (std::bad_alloc &e) {
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throw InvalidNoiseParamsException();
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}
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allocBuffers();
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}
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Noise::~Noise()
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{
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delete[] buf;
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delete[] gradient_buf;
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delete[] persist_buf;
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delete[] noise_buf;
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delete[] result;
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delete[] noisebuf;
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}
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void Noise::allocBuffers()
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{
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this->noise_buf = NULL;
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resizeNoiseBuf(sz > 1);
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delete[] gradient_buf;
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delete[] persist_buf;
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delete[] result;
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try {
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size_t bufsize = sx * sy * sz;
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this->persist_buf = NULL;
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this->gradient_buf = new float[bufsize];
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this->result = new float[bufsize];
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} catch (std::bad_alloc &e) {
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throw InvalidNoiseParamsException();
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}
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}
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@ -368,17 +374,7 @@ void Noise::setSize(int sx, int sy, int sz)
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this->sy = sy;
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this->sz = sz;
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this->noisebuf = NULL;
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resizeNoiseBuf(sz > 1);
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delete[] buf;
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delete[] result;
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try {
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this->buf = new float[sx * sy * sz];
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this->result = new float[sx * sy * sz];
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} catch (std::bad_alloc &e) {
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throw InvalidNoiseParamsException();
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}
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allocBuffers();
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}
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@ -414,10 +410,9 @@ void Noise::resizeNoiseBuf(bool is3d)
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nly = (int)(sy * ofactor / np->spread.Y) + 3;
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nlz = is3d ? (int)(sz * ofactor / np->spread.Z) + 3 : 1;
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if (noisebuf)
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delete[] noisebuf;
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delete[] noise_buf;
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try {
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noisebuf = new float[nlx * nly * nlz];
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noise_buf = new float[nlx * nly * nlz];
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} catch (std::bad_alloc &e) {
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throw InvalidNoiseParamsException();
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}
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@ -460,29 +455,30 @@ void Noise::gradientMap2D(
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index = 0;
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for (j = 0; j != nly; j++)
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for (i = 0; i != nlx; i++)
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noisebuf[index++] = noise2d(x0 + i, y0 + j, seed);
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noise_buf[index++] = noise2d(x0 + i, y0 + j, seed);
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//calculate interpolations
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index = 0;
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noisey = 0;
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for (j = 0; j != sy; j++) {
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v00 = noisebuf[idx(0, noisey)];
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v10 = noisebuf[idx(1, noisey)];
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v01 = noisebuf[idx(0, noisey + 1)];
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v11 = noisebuf[idx(1, noisey + 1)];
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v00 = noise_buf[idx(0, noisey)];
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v10 = noise_buf[idx(1, noisey)];
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v01 = noise_buf[idx(0, noisey + 1)];
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v11 = noise_buf[idx(1, noisey + 1)];
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u = orig_u;
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noisex = 0;
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for (i = 0; i != sx; i++) {
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buf[index++] = interpolate(v00, v10, v01, v11, u, v);
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gradient_buf[index++] = interpolate(v00, v10, v01, v11, u, v);
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u += step_x;
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if (u >= 1.0) {
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u -= 1.0;
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noisex++;
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v00 = v10;
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v01 = v11;
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v10 = noisebuf[idx(noisex + 1, noisey)];
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v11 = noisebuf[idx(noisex + 1, noisey + 1)];
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v10 = noise_buf[idx(noisex + 1, noisey)];
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v11 = noise_buf[idx(noisex + 1, noisey + 1)];
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}
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}
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@ -528,7 +524,7 @@ void Noise::gradientMap3D(
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for (k = 0; k != nlz; k++)
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for (j = 0; j != nly; j++)
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for (i = 0; i != nlx; i++)
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noisebuf[index++] = noise3d(x0 + i, y0 + j, z0 + k, seed);
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noise_buf[index++] = noise3d(x0 + i, y0 + j, z0 + k, seed);
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//calculate interpolations
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index = 0;
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@ -538,19 +534,19 @@ void Noise::gradientMap3D(
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v = orig_v;
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noisey = 0;
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for (j = 0; j != sy; j++) {
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v000 = noisebuf[idx(0, noisey, noisez)];
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v100 = noisebuf[idx(1, noisey, noisez)];
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v010 = noisebuf[idx(0, noisey + 1, noisez)];
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v110 = noisebuf[idx(1, noisey + 1, noisez)];
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v001 = noisebuf[idx(0, noisey, noisez + 1)];
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v101 = noisebuf[idx(1, noisey, noisez + 1)];
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v011 = noisebuf[idx(0, noisey + 1, noisez + 1)];
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v111 = noisebuf[idx(1, noisey + 1, noisez + 1)];
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v000 = noise_buf[idx(0, noisey, noisez)];
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v100 = noise_buf[idx(1, noisey, noisez)];
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v010 = noise_buf[idx(0, noisey + 1, noisez)];
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v110 = noise_buf[idx(1, noisey + 1, noisez)];
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v001 = noise_buf[idx(0, noisey, noisez + 1)];
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v101 = noise_buf[idx(1, noisey, noisez + 1)];
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v011 = noise_buf[idx(0, noisey + 1, noisez + 1)];
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v111 = noise_buf[idx(1, noisey + 1, noisez + 1)];
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u = orig_u;
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noisex = 0;
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for (i = 0; i != sx; i++) {
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buf[index++] = interpolate(
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gradient_buf[index++] = interpolate(
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v000, v100, v010, v110,
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v001, v101, v011, v111,
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u, v, w);
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@ -561,12 +557,12 @@ void Noise::gradientMap3D(
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noisex++;
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v000 = v100;
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v010 = v110;
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v100 = noisebuf[idx(noisex + 1, noisey, noisez)];
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v110 = noisebuf[idx(noisex + 1, noisey + 1, noisez)];
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v100 = noise_buf[idx(noisex + 1, noisey, noisez)];
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v110 = noise_buf[idx(noisex + 1, noisey + 1, noisez)];
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v001 = v101;
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v011 = v111;
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v101 = noisebuf[idx(noisex + 1, noisey, noisez + 1)];
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v111 = noisebuf[idx(noisex + 1, noisey + 1, noisez + 1)];
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v101 = noise_buf[idx(noisex + 1, noisey, noisez + 1)];
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v111 = noise_buf[idx(noisex + 1, noisey + 1, noisez + 1)];
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}
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}
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@ -597,11 +593,11 @@ float *Noise::perlinMap2D(float x, float y, float *persistence_map)
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memset(result, 0, sizeof(float) * bufsize);
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float *gmap = NULL;
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if (persistence_map) {
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gmap = new float[bufsize];
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if (!persist_buf)
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persist_buf = new float[bufsize];
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for (size_t i = 0; i != bufsize; i++)
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gmap[i] = 1.0;
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persist_buf[i] = 1.0;
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}
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for (size_t oct = 0; oct < np->octaves; oct++) {
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@ -609,13 +605,12 @@ float *Noise::perlinMap2D(float x, float y, float *persistence_map)
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f / np->spread.X, f / np->spread.Y,
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seed + np->seed + oct);
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updateResults(g, gmap, persistence_map, bufsize);
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updateResults(g, persist_buf, persistence_map, bufsize);
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f *= np->lacunarity;
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g *= np->persist;
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}
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delete[] gmap;
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return result;
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}
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@ -631,11 +626,11 @@ float *Noise::perlinMap3D(float x, float y, float z, float *persistence_map)
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memset(result, 0, sizeof(float) * bufsize);
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float *gmap = NULL;
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if (persistence_map) {
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gmap = new float[bufsize];
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if (!persist_buf)
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persist_buf = new float[bufsize];
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for (size_t i = 0; i != bufsize; i++)
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gmap[i] = 1.0;
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persist_buf[i] = 1.0;
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}
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for (size_t oct = 0; oct < np->octaves; oct++) {
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@ -643,13 +638,12 @@ float *Noise::perlinMap3D(float x, float y, float z, float *persistence_map)
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f / np->spread.X, f / np->spread.Y, f / np->spread.Z,
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seed + np->seed + oct);
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updateResults(g, gmap, persistence_map, bufsize);
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updateResults(g, persist_buf, persistence_map, bufsize);
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f *= np->lacunarity;
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g *= np->persist;
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}
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delete[] gmap;
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return result;
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}
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@ -662,22 +656,22 @@ void Noise::updateResults(float g, float *gmap,
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if (np->flags & NOISE_FLAG_ABSVALUE) {
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if (persistence_map) {
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for (size_t i = 0; i != bufsize; i++) {
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result[i] += gmap[i] * fabs(buf[i]);
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result[i] += gmap[i] * fabs(gradient_buf[i]);
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gmap[i] *= persistence_map[i];
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}
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} else {
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for (size_t i = 0; i != bufsize; i++)
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result[i] += g * fabs(buf[i]);
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result[i] += g * fabs(gradient_buf[i]);
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}
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} else {
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if (persistence_map) {
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for (size_t i = 0; i != bufsize; i++) {
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result[i] += gmap[i] * buf[i];
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result[i] += gmap[i] * gradient_buf[i];
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gmap[i] *= persistence_map[i];
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}
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} else {
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for (size_t i = 0; i != bufsize; i++)
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result[i] += g * buf[i];
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result[i] += g * gradient_buf[i];
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}
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}
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}
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@ -685,13 +679,12 @@ void Noise::updateResults(float g, float *gmap,
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void Noise::transformNoiseMap()
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{
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size_t i = 0;
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for (int z = 0; z != sz; z++)
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for (int y = 0; y != sy; y++)
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for (int x = 0; x != sx; x++) {
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// Because sx, sy, and sz are object members whose values may conceivably be
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// modified in other threads. gcc (at least) will consider the buffer size
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// computation as invalidated between loop comparisons, resulting in a ~2x
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// slowdown even with -O2. To prevent this, store the value in a local.
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size_t bufsize = sx * sy * sz;
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for (size_t i = 0; i != bufsize; i++)
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result[i] = result[i] * np->scale + np->offset;
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i++;
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}
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}
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16
src/noise.h
16
src/noise.h
@ -127,8 +127,9 @@ public:
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int sx;
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int sy;
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int sz;
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float *noisebuf;
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float *buf;
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float *noise_buf;
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float *gradient_buf;
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float *persist_buf;
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float *result;
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Noise(NoiseParams *np, int seed, int sx, int sy, int sz=1);
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@ -137,7 +138,6 @@ public:
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void setSize(int sx, int sy, int sz=1);
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void setSpreadFactor(v3f spread);
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void setOctaves(int octaves);
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void resizeNoiseBuf(bool is3d);
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void gradientMap2D(
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float x, float y,
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@ -151,8 +151,13 @@ public:
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float *perlinMap2D(float x, float y, float *persistence_map=NULL);
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float *perlinMap3D(float x, float y, float z, float *persistence_map=NULL);
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void updateResults(float g, float *gmap, float *persistence_map, size_t bufsize);
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void transformNoiseMap();
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private:
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void allocBuffers();
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void resizeNoiseBuf(bool is3d);
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void updateResults(float g, float *gmap, float *persistence_map, size_t bufsize);
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};
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// Return value: -1 ... 1
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@ -174,7 +179,8 @@ float noise3d_perlin(float x, float y, float z, int seed,
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float noise3d_perlin_abs(float x, float y, float z, int seed,
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int octaves, float persistence, bool eased=false);
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inline float easeCurve(float t) {
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inline float easeCurve(float t)
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{
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return t * t * t * (t * (6.f * t - 15.f) + 10.f);
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}
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