/*
* Copyright 2014 MovingBlocks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.terasology.core.world.generator.facetProviders;
import org.terasology.entitySystem.Component;
import org.terasology.math.TeraMath;
import org.terasology.rendering.nui.properties.Range;
import org.terasology.utilities.procedural.BrownianNoise3D;
import org.terasology.utilities.procedural.Noise3DTo2DAdapter;
import org.terasology.utilities.procedural.PerlinNoise;
import org.terasology.utilities.procedural.SubSampledNoise2D;
import org.terasology.world.generation.ConfigurableFacetProvider;
import org.terasology.world.generation.Facet;
import org.terasology.world.generation.FacetProvider;
import org.terasology.world.generation.GeneratingRegion;
import org.terasology.world.generation.Updates;
import org.terasology.world.generation.facets.SurfaceHeightFacet;
import javax.vecmath.Vector2f;
/**
* Applies an amount of the max depth for regions that are rivers
*/
@Updates(@Facet(SurfaceHeightFacet.class))
public class PerlinRiverProvider implements FacetProvider, ConfigurableFacetProvider {
private static final int SAMPLE_RATE = 4;
private SubSampledNoise2D riverNoise;
private PerlinRiverProviderConfiguration configuration = new PerlinRiverProviderConfiguration();
@Override
public void setSeed(long seed) {
riverNoise = new SubSampledNoise2D(new Noise3DTo2DAdapter(new BrownianNoise3D(new PerlinNoise(seed + 2), 8)), new Vector2f(0.0008f, 0.0008f), SAMPLE_RATE);
}
@Override
public void process(GeneratingRegion region) {
SurfaceHeightFacet facet = region.getRegionFacet(SurfaceHeightFacet.class);
float[] noise = riverNoise.noise(facet.getWorldRegion());
float[] surfaceHeights = facet.getInternal();
for (int i = 0; i < noise.length; ++i) {
surfaceHeights[i] += configuration.maxDepth * TeraMath.clamp(7f * (TeraMath.sqrt(Math.abs(noise[i])) - 0.1f) + 0.25f);
}
}
@Override
public String getConfigurationName() {
return "Rivers";
}
@Override
public Component getConfiguration() {
return configuration;
}
@Override
public void setConfiguration(Component configuration) {
this.configuration = (PerlinRiverProviderConfiguration) configuration;
}
private static class PerlinRiverProviderConfiguration implements Component {
@Range(min = 0, max = 64f, increment = 1f, precision = 0, description = "River Depth")
public float maxDepth = 16;
}
}