engine/src/core/com/jme3/scene/shape/StripBox.java

/*
 * Copyright (c) 2009-2010 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// $Id: Box.java 4131 2009-03-19 20:15:28Z blaine.dev $
package com.jme3.scene.shape;

import com.jme3.math.Vector3f;
import com.jme3.scene.VertexBuffer.Type;
import com.jme3.util.BufferUtils;
import java.nio.FloatBuffer;

/**
 * A box with solid (filled) faces.
 * 
 * @author Mark Powell
 * @version $Revision: 4131 $, $Date: 2009-03-19 16:15:28 -0400 (Thu, 19 Mar 2009) $
 */
public class StripBox extends AbstractBox {
    
    private static final short[] GEOMETRY_INDICES_DATA = 
    { 1, 0, 4,
      5, 
      7, 
      0, 
      3, 
      1, 
      2, 
      4, 
      6, 
      7, 
      2, 
      3 };
    
    private static final float[] GEOMETRY_TEXTURE_DATA = {
        1, 0,
        0, 0,
        0, 1,
        1, 1,
        
        1, 0,
        0, 0,
        1, 1,
        0, 1
    };
    
    /**
     * Creates a new box.
     * <p>
     * The box has a center of 0,0,0 and extends in the out from the center by
     * the given amount in <em>each</em> direction. So, for example, a box
     * with extent of 0.5 would be the unit cube.
     *
     * @param x the size of the box along the x axis, in both directions.
     * @param y the size of the box along the y axis, in both directions.
     * @param z the size of the box along the z axis, in both directions.
     */
    public StripBox(float x, float y, float z) {
        super();
        updateGeometry(Vector3f.ZERO, x, y, z);
    }

    /**
     * Creates a new box.
     * <p>
     * The box has the given center and extends in the out from the center by
     * the given amount in <em>each</em> direction. So, for example, a box
     * with extent of 0.5 would be the unit cube.
     * 
     * @param center the center of the box.
     * @param x the size of the box along the x axis, in both directions.
     * @param y the size of the box along the y axis, in both directions.
     * @param z the size of the box along the z axis, in both directions.
     */
    public StripBox(Vector3f center, float x, float y, float z) {
        super();
        updateGeometry(center, x, y, z);
    }

    /**
     * Constructor instantiates a new <code>Box</code> object.
     * <p>
     * The minimum and maximum point are provided, these two points define the
     * shape and size of the box but not it’s orientation or position. You should
     * use the {@link #setLocalTranslation()} and {@link #setLocalRotation()}
     * methods to define those properties.
     * 
     * @param min the minimum point that defines the box.
     * @param max the maximum point that defines the box.
     */
    public StripBox(Vector3f min, Vector3f max) {
        super();
        updateGeometry(min, max);
    }

    /**
     * Empty constructor for serialization only. Do not use.
     */
    public StripBox(){
        super();
    }

    /**
     * Creates a clone of this box.
     * <p>
     * The cloned box will have ‘_clone’ appended to it’s name, but all other
     * properties will be the same as this box.
     */
    @Override
    public StripBox clone() {
        return new StripBox(center.clone(), xExtent, yExtent, zExtent);
    }

    protected void duUpdateGeometryIndices() {
        if (getBuffer(Type.Index) == null){
            setBuffer(Type.Index, 3, BufferUtils.createShortBuffer(GEOMETRY_INDICES_DATA));
        }
    }

    protected void duUpdateGeometryNormals() {
        if (getBuffer(Type.Normal) == null){
            float[] normals = new float[8 * 3];
            
            Vector3f[] vert = computeVertices();
            Vector3f norm = new Vector3f();
            
            for (int i = 0; i < 8; i++) {
                norm.set(vert[i]).normalizeLocal();
                
                normals[i * 3 + 0] = norm.x;
                normals[i * 3 + 1] = norm.x;
                normals[i * 3 + 2] = norm.x;
            }
            
            setBuffer(Type.Normal, 3, BufferUtils.createFloatBuffer(normals));
        }
    }

    protected void duUpdateGeometryTextures() {
        if (getBuffer(Type.TexCoord) == null){
            setBuffer(Type.TexCoord, 2, BufferUtils.createFloatBuffer(GEOMETRY_TEXTURE_DATA));
        }
    }

    protected void duUpdateGeometryVertices() {
        FloatBuffer fpb = BufferUtils.createVector3Buffer(8 * 3);
        Vector3f[] v = computeVertices();
        fpb.put(new float[] {
                v[0].x, v[0].y, v[0].z, 
                v[1].x, v[1].y, v[1].z, 
                v[2].x, v[2].y, v[2].z, 
                v[3].x, v[3].y, v[3].z,
                v[4].x, v[4].y, v[4].z, 
                v[5].x, v[5].y, v[5].z, 
                v[6].x, v[6].y, v[6].z, 
                v[7].x, v[7].y, v[7].z, 
        });
        setBuffer(Type.Position, 3, fpb);
        setMode(Mode.TriangleStrip);
        updateBound();
    }

}