Android Open Source - min3d Faces Buffered List

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License

The source code is released under:
MIT License
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Java Source Code

package com.min3d.lib.core;
/*w w w . ja  va  2  s.co  m*/
import com.min3d.lib.vos.Face;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.ShortBuffer;

public class FacesBufferedList
{
  public static final int PROPERTIES_PER_ELEMENT = 3;
  public static final int BYTES_PER_PROPERTY = 2;

  private ShortBuffer _b;
  private int _numElements;

  private int _renderSubsetStartIndex = 0;
  private int _renderSubsetLength = 1;
  private boolean _renderSubsetEnabled = false;
  
  public FacesBufferedList(ShortBuffer $b, int $size)
  {
    ByteBuffer bb = ByteBuffer.allocateDirect($b.limit() * BYTES_PER_PROPERTY); 
    bb.order(ByteOrder.nativeOrder());
    _b = bb.asShortBuffer();
    _b.put($b);
    _numElements = $size;
  }
  
  public FacesBufferedList(int $maxElements)
  {
    ByteBuffer b = ByteBuffer.allocateDirect($maxElements * PROPERTIES_PER_ELEMENT * BYTES_PER_PROPERTY); 
    b.order(ByteOrder.nativeOrder());
    _b = b.asShortBuffer();
  }
  
  /**
   * The number of items in the list. 
   */
  public int size()
  {
    return _numElements;
  }
  
  
  /**
   * The _maximum_ number of items that the list can hold, as defined on instantiation.
   * (Not to be confused with the Buffer's capacity)
   */
  public int capacity()
  {
    return _b.capacity() / PROPERTIES_PER_ELEMENT;
  }
  
  /**
   * Clear object in preparation for garbage collection
   */
  public void clear()
  {
    _b.clear();
  }

  public Face get(int $index)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    return new Face( _b.get(), _b.get(), _b.get() );
  }
  
  public void putInFace(int $index, Face $face)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    $face.a = (short)_b.get();
    $face.b = (short)_b.get();
    $face.c = (short)_b.get();
  }
  
  public short getPropertyA(int $index)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    return (short)_b.get();
  }
  public short getPropertyB(int $index)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT + 1);
    return (short)_b.get();
  }
  public float getPropertyC(int $index)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT + 2);
    return (short)_b.get();
  }

  /**
   * Enables rendering only a subset of faces (renderSubset must be set to true) 
   * This mechanism could be expanded to render multiple 'subsets' of the list of faces...
   */
  public void renderSubsetStartIndex(int $num)
  {
    _renderSubsetStartIndex = $num;
  }
  public int renderSubsetStartIndex()
  {
    return _renderSubsetStartIndex;
  }
  public void renderSubsetLength(int $num)
  {
    _renderSubsetLength = $num;
  }
  public int renderSubsetLength()
  {
    return _renderSubsetLength;
  }
  
  /**
   * If true, Renderer will only draw the faces as defined by 
   * renderSubsetStartIndex and renderSubsetLength  
   */
  public boolean renderSubsetEnabled()
  {
    return _renderSubsetEnabled;
  }
  public void renderSubsetEnabled(boolean $b)
  {
    _renderSubsetEnabled = $b;
  }
  
  //
  
  public void add(Face $f)
  {
    set( _numElements, $f );
    _numElements++;
  }
  
  public void add(int $a, int $b, int $c) {
    add((short)$a, (short)$b, (short)$c);
  }
  
  public void add(short $a, short $b, short $c)
  {
    set(_numElements, $a, $b, $c);
    _numElements++;
  }
  
  public void set(int $index, Face $face)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    _b.put($face.a);
    _b.put($face.b);
    _b.put($face.c);
  }

  public void set(int $index, short $a, short $b, short $c)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    _b.put($a);
    _b.put($b);
    _b.put($c);
  }
  
  public void setPropertyA(int $index, short $a)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    _b.put($a);
  }
  public void setPropertyB(int $index, short $b)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT + 1);
    _b.put($b);
  }
  public void setPropertyC(int $index, short $c)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT + 2);
    _b.put($c);
  }
  
  //
  
  public ShortBuffer buffer()
  {
    return _b;
  }
  
  public FacesBufferedList clone()
  {
    _b.position(0);
    FacesBufferedList c = new FacesBufferedList(_b, size());
    return c;
  }
}
Java Source Code List
