/*
* 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.math.Vector2i;
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.GeneratingRegion;
import org.terasology.world.generation.Requires;
import org.terasology.world.generation.Updates;
import org.terasology.world.generation.facets.SurfaceHeightFacet;
import org.terasology.world.generation.facets.SurfaceHumidityFacet;
import org.terasology.world.generation.facets.SurfaceTemperatureFacet;
import javax.vecmath.Vector2f;
import java.util.Iterator;
/**
* Adds surface height for hill and mountain regions. Mountain and hill regions are based off of temperature and humidity.
*/
@Requires({@Facet(SurfaceTemperatureFacet.class), @Facet(SurfaceHumidityFacet.class)})
@Updates(@Facet(SurfaceHeightFacet.class))
public class PerlinHillsAndMountainsProvider implements ConfigurableFacetProvider {
private SubSampledNoise2D mountainNoise;
private SubSampledNoise2D hillNoise;
private PerlinHillsAndMountainsProviderConfiguration configuration = new PerlinHillsAndMountainsProviderConfiguration();
@Override
public void setSeed(long seed) {
mountainNoise = new SubSampledNoise2D(new Noise3DTo2DAdapter(new BrownianNoise3D(new PerlinNoise(seed + 3))), new Vector2f(0.0002f, 0.0002f), 4);
hillNoise = new SubSampledNoise2D(new Noise3DTo2DAdapter(new BrownianNoise3D(new PerlinNoise(seed + 4))), new Vector2f(0.0008f, 0.0008f), 4);
}
@Override
public void process(GeneratingRegion region) {
SurfaceHeightFacet facet = region.getRegionFacet(SurfaceHeightFacet.class);
float[] mountainData = mountainNoise.noise(facet.getWorldRegion());
float[] hillData = hillNoise.noise(facet.getWorldRegion());
SurfaceTemperatureFacet temperatureData = region.getRegionFacet(SurfaceTemperatureFacet.class);
SurfaceHumidityFacet humidityData = region.getRegionFacet(SurfaceHumidityFacet.class);
float[] heightData = facet.getInternal();
Iterator<Vector2i> positionIterator = facet.getRelativeRegion().iterator();
for (int i = 0; i < heightData.length; ++i) {
Vector2i pos = positionIterator.next();
float temp = temperatureData.get(pos);
float tempHumid = temp * humidityData.get(pos);
Vector2f distanceToMountainBiome = new Vector2f(temp - 0.25f, tempHumid - 0.35f);
float mIntens = TeraMath.clamp(1.0f - distanceToMountainBiome.length() * 3.0f);
float densityMountains = Math.max(mountainData[i], 0) * mIntens * configuration.mountainAmplitude;
float densityHills = Math.max(hillData[i] - 0.1f, 0) * (1.0f - mIntens) * configuration.hillAmplitude;
heightData[i] = heightData[i] + 1024 * densityMountains + 128 * densityHills;
}
}
@Override
public String getConfigurationName() {
return "Hills and Mountains";
}
@Override
public Component getConfiguration() {
return configuration;
}
@Override
public void setConfiguration(Component configuration) {
this.configuration = (PerlinHillsAndMountainsProviderConfiguration) configuration;
}
private static class PerlinHillsAndMountainsProviderConfiguration implements Component {
@Range(min = 0, max = 3f, increment = 0.01f, precision = 2, description = "Mountain Amplitude")
public float mountainAmplitude = 1f;
@Range(min = 0, max = 2f, increment = 0.01f, precision = 2, description = "Hill Amplitude")
public float hillAmplitude = 1f;
}
}