/*
* 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.math.Rect2i;
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.Border3D;
import org.terasology.world.generation.Facet;
import org.terasology.world.generation.FacetProvider;
import org.terasology.world.generation.GeneratingRegion;
import org.terasology.world.generation.Produces;
import org.terasology.world.generation.Requires;
import org.terasology.world.generation.facets.SeaLevelFacet;
import org.terasology.world.generation.facets.SurfaceHeightFacet;
import javax.vecmath.Vector2f;
/**
* @author Immortius
*/
@Produces(SurfaceHeightFacet.class)
@Requires(@Facet(SeaLevelFacet.class))
public class PerlinBaseSurfaceProvider implements FacetProvider {
private static final int SAMPLE_RATE = 4;
private SubSampledNoise2D surfaceNoise;
@Override
public void setSeed(long seed) {
surfaceNoise = new SubSampledNoise2D(new Noise3DTo2DAdapter(new BrownianNoise3D(new PerlinNoise(seed), 8)), new Vector2f(0.004f, 0.004f), SAMPLE_RATE);
}
@Override
public void process(GeneratingRegion region) {
Border3D border = region.getBorderForFacet(SurfaceHeightFacet.class);
SurfaceHeightFacet facet = new SurfaceHeightFacet(region.getRegion(), border);
SeaLevelFacet seaLevelFacet = region.getRegionFacet(SeaLevelFacet.class);
float seaLevel = seaLevelFacet.getSeaLevel();
Rect2i processRegion = facet.getWorldRegion();
float[] noise = surfaceNoise.noise(processRegion);
for (int i = 0; i < noise.length; ++i) {
noise[i] = seaLevel + seaLevel * ((noise[i] + 1f) / 2f);
}
facet.set(noise);
region.setRegionFacet(SurfaceHeightFacet.class, facet);
}
}