Android Open Source - splott Index Buffer

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License

The source code is released under:

MIT License

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Java Source Code

package com.wordsaretoys.rise.meshutil;
//w  w  w . j  a v  a2  s  .c o  m
/**
 * growable short int buffer
 * 
 * @namespace rise
 * @class IndexBuffer
 */

public class IndexBuffer {

  public short[] data;
  public int length;
  
  final static private double LN2 = Math.log(2);
  private int limit;
  
  public IndexBuffer() {
    data = new short[16];
    length = 0;
  }
  
  /**
   * grow the vertex buffer if necessary
   * @param n number of shorts to grow by
   */
  private void grow(int n) {
    int newSize = length + n;
    if (newSize > limit) {
      // find smallest power of 2 greater than newSize
      limit = (int) Math.pow(2, Math.ceil(Math.log(newSize) / LN2));
      short[] newBuffer = new short[limit];
      System.arraycopy(data, 0, newBuffer, 0, length);
      data = newBuffer;
    }
  }
  
  /**
   * reset the mesh for use with a new data set
   */
  public void reset() {
    length = 0;
  }
  
  /**
   * add values to the buffer
   * @param i0...in values to add
   */
  
  public void set(int i0) {
    grow(1);
    data[length++] = (short)i0;
  }
  
  public void set(int i0, int i1, int i2) {
    grow(3);
    data[length++] = (short)i0;
    data[length++] = (short)i1;
    data[length++] = (short)i2;
  }

  public void set(int i0, int i1, int i2, int i3, int i4, int i5) {
    grow(6);
    data[length++] = (short)i0;
    data[length++] = (short)i1;
    data[length++] = (short)i2;
    data[length++] = (short)i3;
    data[length++] = (short)i4;
    data[length++] = (short)i5;
  }
}

Java Source Code List