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white noise micro opt

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This commit is contained in:
dfsek 2021-01-11 22:00:10 -07:00
parent 462b0af225
commit 5df511a940
1 changed files with 7 additions and 6 deletions
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13
common/src/main/java/com/dfsek/terra/api/math/noise/samplers/FastNoiseLite.java
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@ -278,6 +278,7 @@ public class FastNoiseLite implements NoiseSampler {
private static final int PRIME_Y = 1136930381;
private static final int PRIME_Z = 1720413743;
private static final NoiseSampler CELLULAR_LOOKUP_DEFAULT = new FastNoiseLite();
private static final long POSITIVE_POW1 = 0b01111111111L << 52; // Bits that when applied to the exponent/sign section of a double, produce a positive number with a power of 1.
private int mSeed = 1337;
private double mFrequency = 0.01f;
private NoiseType mNoiseType = NoiseType.OpenSimplex2;
@ -288,7 +289,7 @@ public class FastNoiseLite implements NoiseSampler {
private double mLacunarity = 2.0f;
private double mGain = 0.5f;
private double mWeightedStrength = 0.0f;
private double mPingPongStength = 2.0f;
private double mPingPongStrength = 2.0f;
private double mFractalBounding = 1 / 1.75f;
private CellularDistanceFunction mCellularDistanceFunction = CellularDistanceFunction.EuclideanSq;
private CellularReturnType mCellularReturnType = CellularReturnType.Distance;
@ -569,7 +570,7 @@ public class FastNoiseLite implements NoiseSampler {
* Default: 2.0
*/
public void setFractalPingPongStrength(double pingPongStrength) {
mPingPongStength = pingPongStrength;
mPingPongStrength = pingPongStrength;
}
/**
@ -886,7 +887,7 @@ public class FastNoiseLite implements NoiseSampler {
double amp = mFractalBounding;
for(int i = 0; i < mOctaves; i++) {
double noise = pingPong((genNoiseSingle(seed++, x, y) + 1) * mPingPongStength);
double noise = pingPong((genNoiseSingle(seed++, x, y) + 1) * mPingPongStrength);
sum += (noise - 0.5f) * 2 * amp;
amp *= lerp(1.0f, noise, mWeightedStrength);
@ -905,7 +906,7 @@ public class FastNoiseLite implements NoiseSampler {
double amp = mFractalBounding;
for(int i = 0; i < mOctaves; i++) {
double noise = pingPong((genNoiseSingle(seed++, x, y, z) + 1) * mPingPongStength);
double noise = pingPong((genNoiseSingle(seed++, x, y, z) + 1) * mPingPongStrength);
sum += (noise - 0.5f) * 2 * amp;
amp *= lerp(1.0f, noise, mWeightedStrength);
@ -1630,7 +1631,7 @@ public class FastNoiseLite implements NoiseSampler {
long hashZ = hash(Double.doubleToRawLongBits(y) ^ seed);
long hash = (((hashX ^ (hashX >>> 32)) + ((hashZ ^ (hashZ >>> 32)) << 32)) ^ seed) + Double.doubleToRawLongBits(z);
long base = ((hash(hash)) & 0x000fffffffffffffL)
+ (0b01111111111L << 52); // Sign and exponent
+ POSITIVE_POW1; // Sign and exponent
return (Double.longBitsToDouble(base) - 1.5) * 2;
}
@ -1639,7 +1640,7 @@ public class FastNoiseLite implements NoiseSampler {
long hashZ = hash(Double.doubleToRawLongBits(y) ^ seed);
long hash = ((hashX ^ (hashX >>> 32)) + ((hashZ ^ (hashZ >>> 32)) << 32)) ^ seed;
long base = (hash(hash) & 0x000fffffffffffffL)
+ (0b01111111111L << 52); // Sign and exponent
+ POSITIVE_POW1; // Sign and exponent
return (Double.longBitsToDouble(base) - 1.5) * 2;
}