Android Open Source - ScalAR Generic Functions

From Project

Back to project page ScalAR.

License

The source code is released under:

GNU General Public License

If you think the Android project ScalAR listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

/**
  Copyright (C) 2009,2010  Tobias Domhan
//w ww.  j  a v  a 2 s .  c  o  m
    This file is part of AndOpenGLCam.

    AndObjViewer is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    AndObjViewer is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with AndObjViewer.  If not, see <http://www.gnu.org/licenses/>.
 
 */
package edu.dhbw.andar;

/**
 * @author Tobias Domhan
 *
 */
public class GenericFunctions {
  /**
   * tests if an integer is power of two
   * source: http://www.devmaster.net/forums/showthread.php?t=1728
   * @param value
   * @return
   */
  static final boolean isPowerOfTwo (int value)  {
    if(value != 0) {
      return (value & -value) == value;
    } else {
      return false;
    }
  }
  
  /**
   * returns the smallest power of two that is greater than
   * or equal to the absolute value of x
   * @param x
   * @return
   */
  static final public int nextPowerOfTwo(int x) {
    double val = (double) x;
    return (int) Math.pow(2, Math.ceil(log2(val)));
  }
  
  /**
   * return the log of x base 2
   * @param x
   * @return
   */
  static final public double log2(double x) {
    return Math.log(x)/Math.log(2);
  }
}

Java Source Code List