Merge pull request #307 from LtPeriwinkle/posterization-normalizer

Implement posterization normalizer

common/addons/config-noise-function/src/main/java/com/dfsek/terra/addons/noise/NoiseAddon.java

@@ -32,6 +32,7 @@ import com.dfsek.terra.addons.noise.config.templates.noise.fractal.RidgedFractal
 import com.dfsek.terra.addons.noise.config.templates.normalizer.ClampNormalizerTemplate;
 import com.dfsek.terra.addons.noise.config.templates.normalizer.LinearNormalizerTemplate;
 import com.dfsek.terra.addons.noise.config.templates.normalizer.NormalNormalizerTemplate;
+import com.dfsek.terra.addons.noise.config.templates.normalizer.PosterizationNormalizerTemplate;
 import com.dfsek.terra.addons.noise.config.templates.normalizer.ProbabilityNormalizerTemplate;
 import com.dfsek.terra.addons.noise.config.templates.normalizer.ScaleNormalizerTemplate;
 import com.dfsek.terra.addons.noise.samplers.arithmetic.AdditionSampler;
@@ -90,6 +91,7 @@ public class NoiseAddon implements AddonInitializer {
                   noiseRegistry.register(addon.key("CLAMP"), ClampNormalizerTemplate::new);
                   noiseRegistry.register(addon.key("PROBABILITY"), ProbabilityNormalizerTemplate::new);
                   noiseRegistry.register(addon.key("SCALE"), ScaleNormalizerTemplate::new);
+                  noiseRegistry.register(addon.key("POSTERIZATION"), PosterizationNormalizerTemplate::new);
             
                   noiseRegistry.register(addon.key("IMAGE"), ImageSamplerTemplate::new);
             
@@ -121,7 +123,6 @@ public class NoiseAddon implements AddonInitializer {
             
                   noiseRegistry.register(addon.key("LINEAR_HEIGHTMAP"), LinearHeightmapSamplerTemplate::new);
             
-            
                   noiseRegistry.register(addon.key("ADD"), () -> new BinaryArithmeticTemplate<>(AdditionSampler::new));
                   noiseRegistry.register(addon.key("SUB"), () -> new BinaryArithmeticTemplate<>(SubtractionSampler::new));
                   noiseRegistry.register(addon.key("MUL"), () -> new BinaryArithmeticTemplate<>(MultiplicationSampler::new));

common/addons/config-noise-function/src/main/java/com/dfsek/terra/addons/noise/config/templates/normalizer/PosterizationNormalizerTemplate.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2022 Polyhedral Development
+ *
+ * The Terra Core Addons are licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in this module's root directory.
+ */
+
+package com.dfsek.terra.addons.noise.config.templates.normalizer;
+
+import com.dfsek.tectonic.api.config.template.annotations.Value;
+
+import com.dfsek.terra.addons.noise.normalizer.PosterizationNormalizer;
+import com.dfsek.terra.api.config.meta.Meta;
+import com.dfsek.terra.api.noise.NoiseSampler;
+
+
+@SuppressWarnings({ "unused", "FieldMayBeFinal" })
+public class PosterizationNormalizerTemplate extends NormalizerTemplate<PosterizationNormalizer> {
+    @Value("steps")
+    private @Meta int steps;
+    
+    @Override
+    public NoiseSampler get() {
+        return new PosterizationNormalizer(function, steps);
+    }
+}

common/addons/config-noise-function/src/main/java/com/dfsek/terra/addons/noise/normalizer/PosterizationNormalizer.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2022 Polyhedral Development
+ *
+ * The Terra Core Addons are licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in this module's root directory.
+ */
+
+package com.dfsek.terra.addons.noise.normalizer;
+
+import com.dfsek.terra.api.noise.NoiseSampler;
+
+import net.jafama.FastMath;
+
+public class PosterizationNormalizer extends Normalizer {
+    private final double stepSize;
+    
+    public PosterizationNormalizer(NoiseSampler sampler, int steps) {
+        super(sampler);
+        this.stepSize = 2.0 / (steps - 1);
+    }
+    
+    @Override
+    public double normalize(double in) {
+        return FastMath.roundToInt((in + 1) / stepSize) * stepSize - 1;
+    }
+}