Android Open Source - splott Vertex 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;
/*from   w w  w.j a  v  a  2 s.  c  o m*/
/**
 * growable floating-point buffer
 * 
 * @namespace rise
 * @class VertexBuffer
 */

public class VertexBuffer {

  public float[] data;
  public int length;
  
  final static private float LN2 = (float)Math.log(2);
  private int limit;
  
  public VertexBuffer() {
    data = new float[16];
    length = 0;
  }
  
  /**
   * grow the vertex buffer if necessary
   * @param n number of floats 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));
      float[] newBuffer = new float[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 float buffer
   * @param x0...xn values to add
   */
  
  public void set(float x0) {
    grow(1);
    data[length++] = x0;
  }

  public void set(float x0, float x1) {
    grow(2);
    data[length++] = x0;
    data[length++] = x1;
  }
  
  public void set(float x0, float x1, float x2) {
    grow(3);
    data[length++] = x0;
    data[length++] = x1;
    data[length++] = x2;
  }

  public void set(float x0, float x1, float x2, float x3) {
    grow(4);
    data[length++] = x0;
    data[length++] = x1;
    data[length++] = x2;
    data[length++] = x3;
  }
  
  public void set(float x0, float x1, float x2, float x3, float x4) {
    grow(5);
    data[length++] = x0;
    data[length++] = x1;
    data[length++] = x2;
    data[length++] = x3;
    data[length++] = x4;
  }

  public void set(float x0, float x1, float x2, float x3, float x4, float x5) {
    grow(6);
    data[length++] = x0;
    data[length++] = x1;
    data[length++] = x2;
    data[length++] = x3;
    data[length++] = x4;
    data[length++] = x5;
  }

  public void set(float x0, float x1, float x2, float x3, float x4, float x5, float x6) {
    grow(7);
    data[length++] = x0;
    data[length++] = x1;
    data[length++] = x2;
    data[length++] = x3;
    data[length++] = x4;
    data[length++] = x5;
    data[length++] = x6;
  }
}

Java Source Code List