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Add KernelSampler

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dfsek
2021-02-18 16:04:22 -07:00
parent c8c9247dfe
commit 40b9c6c08c
5 changed files with 126 additions and 2 deletions
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59
common/src/main/java/com/dfsek/terra/api/math/noise/samplers/KernelSampler.java Normal file
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@@ -0,0 +1,59 @@
package com.dfsek.terra.api.math.noise.samplers;
import com.dfsek.terra.api.math.noise.NoiseSampler;
public class KernelSampler implements NoiseSampler {
private final double[][] kernel;
private final NoiseSampler in;
private double frequency = 1;
public KernelSampler(double[][] kernel, NoiseSampler in) {
this.kernel = kernel;
this.in = in;
}
@Override
public double getNoise(double x, double y) {
return getNoiseSeeded(0, x, y);
}
@Override
public double getNoise(double x, double y, double z) {
return getNoiseSeeded(0, x, y, z);
}
@Override
public double getNoiseSeeded(int seed, double x, double y) {
x *= frequency;
y *= frequency;
double accumulator = 0;
for(int kx = 0; kx < kernel.length; kx++) {
for(int ky = 0; ky < kernel[kx].length; ky++) {
accumulator += in.getNoise(x + kx, y + ky) * kernel[kx][ky];
}
}
return accumulator;
}
@Override
public double getNoiseSeeded(int seed, double x, double y, double z) {
x *= frequency;
y *= frequency;
z *= frequency;
double accumulator = 0;
for(int kx = 0; kx < kernel.length; kx++) {
for(int ky = 0; ky < kernel[kx].length; ky++) {
accumulator += in.getNoise(x + kx, y, z + ky) * kernel[kx][ky];
}
}
return accumulator;
}
public void setFrequency(double frequency) {
this.frequency = frequency;
}
}

61
common/src/main/java/com/dfsek/terra/config/loaders/config/sampler/templates/KernelTemplate.java Normal file
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@@ -0,0 +1,61 @@
package com.dfsek.terra.config.loaders.config.sampler.templates;
import com.dfsek.tectonic.annotations.Default;
import com.dfsek.tectonic.annotations.Value;
import com.dfsek.tectonic.config.ValidatedConfigTemplate;
import com.dfsek.tectonic.exception.ValidationException;
import com.dfsek.terra.api.math.noise.NoiseSampler;
import com.dfsek.terra.api.math.noise.samplers.KernelSampler;
import com.dfsek.terra.api.util.seeded.NoiseSeeded;
import java.util.List;
@SuppressWarnings({"unused", "FieldMayBeFinal"})
public class KernelTemplate extends SamplerTemplate<KernelSampler> implements ValidatedConfigTemplate {
@Value("kernel")
private List<List<Double>> kernel;
@Value("factor")
@Default
private double factor = 1;
@Value("function")
private NoiseSeeded function;
@Value("frequency")
@Default
private double frequency = 1;
@Override
public NoiseSampler apply(Long seed) {
double[][] k = new double[kernel.size()][kernel.get(0).size()];
for(int x = 0; x < kernel.size(); x++) {
for(int y = 0; y < kernel.get(x).size(); y++) {
k[x][y] = kernel.get(x).get(y) * factor;
}
}
KernelSampler sampler = new KernelSampler(k, function.apply(seed));
sampler.setFrequency(frequency);
return sampler;
}
@Override
public boolean validate() throws ValidationException {
if(kernel.isEmpty()) throw new ValidationException("Kernel must not be empty.");
int len = kernel.get(0).size();
if(len == 0) throw new ValidationException("Kernel row must contain data.");
for(int i = 0; i < kernel.size(); i++) {
if(kernel.get(i).size() != len)
throw new ValidationException("Kernel row " + i + " size mismatch. Expected " + len + ", found " + kernel.get(i).size());
}
return super.validate();
}
}

3
common/src/main/java/com/dfsek/terra/config/loaders/config/sampler/templates/noise/ExpressionFunctionTemplate.java
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@@ -28,7 +28,8 @@ public class ExpressionFunctionTemplate extends SamplerTemplate<ExpressionFuncti
private String equation;
@Value("functions")
private Map<String, NoiseSeeded> functions;
@Default
private Map<String, NoiseSeeded> functions = new HashMap<>();
@Override
public NoiseSampler apply(Long seed) {

3
common/src/main/java/com/dfsek/terra/registry/config/NoiseRegistry.java
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@@ -10,6 +10,7 @@ import com.dfsek.terra.api.math.noise.samplers.noise.value.ValueSampler;
import com.dfsek.terra.api.util.seeded.NoiseSeeded;
import com.dfsek.terra.config.loaders.config.sampler.templates.DomainWarpTemplate;
import com.dfsek.terra.config.loaders.config.sampler.templates.ImageSamplerTemplate;
import com.dfsek.terra.config.loaders.config.sampler.templates.KernelTemplate;
import com.dfsek.terra.config.loaders.config.sampler.templates.noise.CellularNoiseTemplate;
import com.dfsek.terra.config.loaders.config.sampler.templates.noise.ConstantNoiseTemplate;
import com.dfsek.terra.config.loaders.config.sampler.templates.noise.ExpressionFunctionTemplate;
@@ -52,5 +53,7 @@ public class NoiseRegistry extends TerraRegistry<Supplier<ObjectTemplate<NoiseSe
add("WHITENOISE", () -> new SimpleNoiseTemplate(WhiteNoiseSampler::new));
add("CONSTANT", ConstantNoiseTemplate::new);
add("KERNEL", KernelTemplate::new);
}
}