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Merge pull request #569 from IntellectualSites/feature/better-noise

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Feature/better noise
This commit is contained in:
NotMyFault
2020-08-21 18:20:30 +02:00
committed by GitHub
parent 49f1658f0b da9d85e427
commit c8a9919c63
13 changed files with 274 additions and 73 deletions
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34
worldedit-core/src/main/java/com/boydti/fawe/object/collection/FastRandomCollection.java
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@ -5,12 +5,29 @@ import com.boydti.fawe.util.MathMan;
import java.util.ArrayList;
import java.util.Map;
import java.util.Optional;
public class FastRandomCollection<T> extends RandomCollection<T> {
private T[] values;
private final T[] values;
public FastRandomCollection(Map<T, Double> weights, SimpleRandom random) {
super(weights, random);
private FastRandomCollection(T[] values, SimpleRandom random) {
super(random);
this.values = values;
}
/**
* Create a new FastRandomCollection if the given values and weights match the criteria.
* The criteria may change at any point, so this method isn't guaranteed to return a
* non-empty Optional in any case.
*
* @param weights the weight of the values.
* @param random the random generator to use for this collection.
* @param <T> the value type.
* @return an {@link Optional} containing the new collection if it could
* be created, {@link Optional#empty()} otherwise.
* @see RandomCollection for API usage.
*/
public static <T> Optional<RandomCollection<T>> create(Map<T, Double> weights, SimpleRandom random) {
int max = 0;
int[] counts = new int[weights.size()];
Double[] weightDoubles = weights.values().toArray(new Double[0]);
@ -18,7 +35,7 @@ public class FastRandomCollection<T> extends RandomCollection<T> {
int weight = (int) (weightDoubles[i] * 100);
counts[i] = weight;
if (weight != (weightDoubles[i] * 100)) {
throw new IllegalArgumentException("Too small");
return Optional.empty();
}
if (weight > max) {
max = weight;
@ -26,7 +43,7 @@ public class FastRandomCollection<T> extends RandomCollection<T> {
}
int gcd = MathMan.gcd(counts);
if (max / gcd > 100000) {
throw new IllegalArgumentException("Too large");
return Optional.empty();
}
ArrayList<T> parsed = new ArrayList<>();
for (Map.Entry<T, Double> entry : weights.entrySet()) {
@ -35,11 +52,14 @@ public class FastRandomCollection<T> extends RandomCollection<T> {
parsed.add(entry.getKey());
}
}
this.values = (T[]) parsed.toArray();
@SuppressWarnings("unchecked")
T[] values = (T[]) parsed.toArray();
FastRandomCollection<T> fastRandomCollection = new FastRandomCollection<>(values, random);
return Optional.of(fastRandomCollection);
}
@Override
public T next(int x, int y, int z) {
return values[random.nextInt(x, y, z, values.length)];
return values[getRandom().nextInt(x, y, z, values.length)];
}
}

28
worldedit-core/src/main/java/com/boydti/fawe/object/collection/RandomCollection.java
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@ -6,19 +6,33 @@ import java.util.Map;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* A RandomCollection holds multiple values that can be accessed by using
* {@link RandomCollection#next(int, int, int)}. The returned value is
* determined by a given {@link SimpleRandom} implementation.
*
* @param <T> the type of values the collection holds.
*/
public abstract class RandomCollection<T> {
protected SimpleRandom random;
private SimpleRandom random;
public RandomCollection(Map<T, Double> weights, SimpleRandom random) {
protected RandomCollection(SimpleRandom random) {
this.random = random;
}
/**
* Return a new RandomCollection. The implementation may differ depending on the
* given arguments but there is no need to differ.
*
* @param weights the weighted map.
* @param random the random number generator.
* @param <T> the type the collection holds.
* @return a RandomCollection using the given weights and the RNG.
*/
public static <T> RandomCollection<T> of(Map<T, Double> weights, SimpleRandom random) {
try {
return new FastRandomCollection<>(weights, random);
} catch (IllegalArgumentException ignore) {
return new SimpleRandomCollection<>(weights, random);
}
checkNotNull(random);
return FastRandomCollection.create(weights, random)
.orElse(new SimpleRandomCollection<>(weights, random));
}
public void setRandom(SimpleRandom random) {

13
worldedit-core/src/main/java/com/boydti/fawe/object/collection/SimpleRandomCollection.java
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@ -11,8 +11,16 @@ public class SimpleRandomCollection<E> extends RandomCollection<E> {
private final NavigableMap<Double, E> map = new TreeMap<>();
private double total = 0;
/**
* Create a {@link RandomCollection} from a weighted map and a RNG.
* It is recommended to use {@link RandomCollection#of(Map, SimpleRandom)}
* instead of this constructor.
*
* @param weights the weighted map.
* @param random the random number generator.
*/
public SimpleRandomCollection(Map<E, Double> weights, SimpleRandom random) {
super(weights, random);
super(random);
for (Map.Entry<E, Double> entry : weights.entrySet()) {
add(entry.getValue(), entry.getKey());
}
@ -24,7 +32,8 @@ public class SimpleRandomCollection<E> extends RandomCollection<E> {
map.put(total, result);
}
@Override
public E next(int x, int y, int z) {
return map.ceilingEntry(random.nextDouble(x, y, z)).getValue();
return map.ceilingEntry(getRandom().nextDouble(x, y, z)).getValue();
}
}

34
worldedit-core/src/main/java/com/boydti/fawe/object/random/NoiseRandom.java Normal file
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@ -0,0 +1,34 @@
package com.boydti.fawe.object.random;
import com.sk89q.worldedit.math.Vector3;
import com.sk89q.worldedit.math.noise.NoiseGenerator;
public class NoiseRandom implements SimpleRandom {
private final NoiseGenerator generator;
private final double scale;
/**
* Create a new NoiseRandom instance using a specific {@link NoiseGenerator} and a scale.
*
* @param generator The generator to use for the noise
* @param scale The scale of the noise
*/
public NoiseRandom(NoiseGenerator generator, double scale) {
this.generator = generator;
this.scale = scale;
}
@Override
public double nextDouble(int x, int y, int z) {
return cap(this.generator.noise(Vector3.at(x, y, z).multiply(this.scale)));
}
// workaround for noise generators returning [0, 1]
private double cap(double d) {
if (d >= 1.0) {
return 0x1.fffffffffffffp-1; // very close to 1 but less
}
return d;
}
}

23
worldedit-core/src/main/java/com/boydti/fawe/object/random/SimpleRandom.java
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@ -2,10 +2,29 @@ package com.boydti.fawe.object.random;
public interface SimpleRandom {
/**
* Generate a random double from three integer components.
* The generated value is between 0 (inclusive) and 1 (exclusive).
*
* @param x the first component
* @param y the second component
* @param z the third component
* @return a double between 0 (inclusive) and 1 (exclusive)
*/
double nextDouble(int x, int y, int z);
default int nextInt(int x, int y, int z, int len) {
/**
* Generate a random integer from three integer components.
* The generated value is between 0 (inclusive) and 1 (exclusive)
*
* @param x the first component
* @param y the second component
* @param z the third component
* @param bound the upper bound (exclusive)
* @return a random integer between 0 (inclusive) and {@code bound} (exclusive)
*/
default int nextInt(int x, int y, int z, int bound) {
double val = nextDouble(x, y, z);
return (int) (val * len);
return (int) (val * bound);
}
}

14
worldedit-core/src/main/java/com/boydti/fawe/object/random/SimplexRandom.java
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@ -1,14 +0,0 @@
package com.boydti.fawe.object.random;
public class SimplexRandom implements SimpleRandom {
private final double scale;
public SimplexRandom(double scale) {
this.scale = scale;
}
@Override
public double nextDouble(int x, int y, int z) {
return (SimplexNoise.noise(x * scale, y * scale, z * scale) + 1) * 0.5;
}
}