Android Open Source - NotATop Utils

From Project

Back to project page NotATop.

License

The source code is released under:

GNU General Public License

If you think the Android project NotATop 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

package com.gg.util;
/*from  ww w. j  av  a 2 s  .co m*/
import javax.microedition.khronos.opengles.GL10;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.opengl.GLUtils;


final public class Utils {

  private static Matrix yFlipMatrix;
  
  static {
    yFlipMatrix = new Matrix();
    yFlipMatrix.postScale(-1, 1); // flip Y axis
  }
  
  public static Bitmap getTextureFromBitmapResource(Context context, int resourceId) {
    
    Bitmap bitmap = null;
    try {
      bitmap = BitmapFactory.decodeResource(context.getResources(), resourceId);
      return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), yFlipMatrix, false);
    }
    finally  {
      if (bitmap != null) {
        bitmap.recycle();
      }
    }
  }  

  public static void generateMipmapsForBoundTexture(Bitmap texture) {
    
    // generate the full texture (mipmap level 0)
    GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, texture, 0);
    
    Bitmap currentMipmap = texture;
    
    int width = texture.getWidth();
    int height = texture.getHeight();
    int level = 0;
    
    boolean reachedLastLevel;
    do {
      
      // go to next mipmap level
      if (width > 1) width /= 2;
      if (height > 1) height /= 2;
      level++;
      reachedLastLevel = (width == 1 && height == 1);
      
      // generate next mipmap
      Bitmap mipmap = Bitmap.createScaledBitmap(currentMipmap, width, height, true);
      GLUtils.texImage2D(GL10.GL_TEXTURE_2D, level, mipmap, 0);
      
      // recycle last mipmap (but don't recycle original texture)
      if (currentMipmap != texture)
      {
        currentMipmap.recycle();
      }
      
      // remember last generated mipmap
      currentMipmap = mipmap;
      
    } while (!reachedLastLevel);
    
    // once again, recycle last mipmap (but don't recycle original texture)
    if (currentMipmap != texture) {
      currentMipmap.recycle();
    }
  }

  public static void setXYZ(float[] vector, int offset, float x, float y, float z) {
    vector[offset] = x;
    vector[offset + 1] = y;
    vector[offset + 2] = z;
  }

  public static void setXYZn(float[] vector, int offset, float x, float y, float z) {
    float r = (float)Math.sqrt(x * x + y * y + z * z);
    setXYZ(vector, offset, x / r, y / r, z / r);
  }
  
  public static void setXY(float[] vector, int offset, float x, float y) {
    vector[offset] = x;
    vector[offset + 1] = y;
  }
  
}

Java Source Code List