/*
* Copyright 2013 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.rendering.assets.mesh;
import gnu.trove.list.TFloatList;
import gnu.trove.list.TIntList;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.terasology.asset.AssetLoader;
import org.terasology.module.Module;
import org.terasology.rendering.collada.ColladaLoader;
/**
* Importer for Collada data exchange model files. Supports mesh data
*
* The development of this loader was greatly influenced by
* http://www.wazim.com/Collada_Tutorial_1.htm
*
* @author mkienenb@gmail.com
*/
public class ColladaMeshLoader extends ColladaLoader implements AssetLoader<MeshData> {
private static final Logger logger = LoggerFactory.getLogger(ColladaMeshLoader.class);
@Override
public MeshData load(Module module, InputStream stream, List<URL> urls, List<URL> deltas) throws IOException {
logger.info("Loading mesh for " + urls);
try {
parseMeshData(stream);
} catch (ColladaParseException e) {
logger.error("Unable to load mesh for " + urls, e);
return null;
}
MeshData data = new MeshData();
TFloatList colorsMesh = data.getColors();
TFloatList verticesMesh = data.getVertices();
TFloatList texCoord0Mesh = data.getTexCoord0();
TFloatList normalsMesh = data.getNormals();
TIntList indicesMesh = data.getIndices();
// Scale vertices coordinates by unitsPerMeter
for (int i = 0; i < this.vertices.size(); i++) {
float originalVertexValue = this.vertices.get(i);
float adjustedVertexValue = (float) (originalVertexValue * unitsPerMeter);
verticesMesh.add(adjustedVertexValue);
}
colorsMesh.addAll(this.colors);
texCoord0Mesh.addAll(this.texCoord0);
normalsMesh.addAll(this.normals);
indicesMesh.addAll(this.indices);
if (data.getVertices() == null) {
throw new IOException("No vertices define");
}
//if (data.getNormals() == null || data.getNormals().size() != data.getVertices().size()) {
// throw new IOException("The number of normals does not match the number of vertices.");
//}
if (((null == data.getColors()) || (0 == data.getColors().size()))
&& ((null == data.getTexCoord0()) || (0 == data.getTexCoord0().size()))) {
throw new IOException("There must be either texture coordinates or vertex colors provided.");
}
if ((null != data.getTexCoord0()) && (0 != data.getTexCoord0().size())) {
if (data.getTexCoord0().size() / 2 != data.getVertices().size() / 3) {
throw new IOException("The number of tex coords (" + data.getTexCoord0().size() / 2
+ ") does not match the number of vertices (" + data.getVertices().size() / 3
+ ").");
}
}
if ((null != data.getColors()) && (0 != data.getColors().size())) {
if (data.getColors().size() / 4 != data.getVertices().size() / 3) {
throw new IOException("The number of vertex colors (" + data.getColors().size() / 4
+ ") does not match the number of vertices (" + data.getVertices().size() / 3
+ ").");
}
}
return data;
}
}