/*
* JaamSim Discrete Event Simulation
* Copyright (C) 2013 Ausenco Engineering Canada Inc.
*
* 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 com.jaamsim.MeshFiles;
import com.jaamsim.math.Vec2d;
import com.jaamsim.math.Vec3d;
import com.jaamsim.math.Vec4d;
/**
* Vertex is a simple data container class, mostly needed for its equals() and hashcode() overrides
* this allows us to build up semi-efficient hash maps of vertex data when building geometry
* @author matt.chudleigh
*
*/
public class Vertex {
private final Vec3d position;
private final Vec3d normal;
private final Vec2d texCoord;
private final int cachedHash;
public Vertex(Vec3d position, Vec3d normal, Vec2d texCoord, Vec4d boneIndices, Vec4d boneWeights) {
this.position = position;
this.normal = normal;
this.texCoord = texCoord;
// If we have boneIndices we must also have boneWeights
assert((boneIndices==null) == (boneWeights==null));
// Calculate a hash of the Vertex contents
cachedHash = hashVertex();
}
private static int hashDouble(double d) {
long l = Double.doubleToLongBits(d);
return (int)(l ^ (l >>> 32));
}
private static int hashVec2d(Vec2d v) {
int hash = 0;
hash ^= hashDouble(v.x);
hash ^= hashDouble(v.y) * 3;
return hash;
}
private static int hashVec3d(Vec3d v) {
int hash = 0;
hash ^= hashDouble(v.x);
hash ^= hashDouble(v.y) * 3;
hash ^= hashDouble(v.z) * 7;
return hash;
}
/** Calculate a hash of the Vertex contents */
private int hashVertex() {
int ret = 0;
ret ^= hashVec3d(position);
ret ^= hashVec3d(normal) * 11;
if (texCoord != null)
ret ^= hashVec2d(texCoord) * 19;
return ret;
}
@Override
public boolean equals(Object o) {
if (!(o instanceof Vertex)) {
return false;
}
Vertex ov = (Vertex)o;
if (position != ov.position && !position.equals3(ov.position)) {
return false;
}
if (normal != ov.normal && !normal.equals3(ov.normal)) {
return false;
}
// One has a texCoord, but not the other
if ((texCoord==null) != (ov.texCoord==null)) {
return false;
}
if (texCoord != null && texCoord != ov.texCoord && !texCoord.equals2(ov.texCoord)) {
return false;
}
return true;
}
@Override
public int hashCode() {
return cachedHash;
}
public Vec3d getPos() {
return position;
}
public Vec3d getNormal() {
return normal;
}
public Vec2d getTexCoord() {
return texCoord;
}
}