UvBufferList.java :  » Graphics-3D-2D-OpenGL » min3d » min3d » core » Android Open Source

package min3d.core;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import min3d.vos.Uv;


public class UvBufferList 
{
  public static final int PROPERTIES_PER_ELEMENT = 2;
  public static final int BYTES_PER_PROPERTY = 4;

  private FloatBuffer _b;
  private int _numElements = 0;
  
  public UvBufferList(FloatBuffer $b, int $size)
  {
    ByteBuffer bb = ByteBuffer.allocateDirect($b.limit() * BYTES_PER_PROPERTY); 
    bb.order(ByteOrder.nativeOrder());
    _b = bb.asFloatBuffer();
    _b.put($b);
    _numElements = $size;
  }
  
  public UvBufferList(int $maxElements)
  {
    int numBytes = $maxElements * PROPERTIES_PER_ELEMENT * BYTES_PER_PROPERTY;
    ByteBuffer bb = ByteBuffer.allocateDirect(numBytes); 
    bb.order(ByteOrder.nativeOrder());
    
    _b  = bb.asFloatBuffer();
  }
  
  /**
   * 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 Uv getAsUv(int $index)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    return new Uv( _b.get(), _b.get() );
  }
  
  public void putInUv(int $index, Uv $uv)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    $uv.u = _b.get();
    $uv.v = _b.get();
  }

  public float getPropertyU(int $index)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    return _b.get();
  }
  public float getPropertyV(int $index)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT + 1);
    return _b.get();
  }
  
  //
  
  public void add(Uv $uv)
  {
    set( _numElements, $uv );
    _numElements++;
  }
  
  public void add(float $u, float $v)
  {
    set(_numElements, $u, $v);
    _numElements++;
  }
  
  public void set(int $index, Uv $uv)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    _b.put($uv.u);
    _b.put($uv.v);
  }

  public void set(int $index, float $u, float $v)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    _b.put($u);
    _b.put($v);
  }
  
  public void setPropertyU(int $index, float $u)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT);
    _b.put($u);
  }
  public void setPropertyV(int $index, float $v)
  {
    _b.position($index * PROPERTIES_PER_ELEMENT + 1);
    _b.put($v);
  }
  
  //
  
  public FloatBuffer buffer()
  {
    return _b;
  }
  
  public UvBufferList clone()
  {
    _b.position(0);
    UvBufferList c = new UvBufferList(_b, size());
    return c;
  }
}