Add KernelSampler

common/src/main/java/com/dfsek/terra/config/loaders/config/sampler/templates/KernelTemplate.java

@@ -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();
+    }
+}

common/src/main/java/com/dfsek/terra/config/loaders/config/sampler/templates/noise/ExpressionFunctionTemplate.java

@@ -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) {