generate Mipmaps For Bound Texture : Bitmap « 2D Graphics « Android






  1. Android
  2. 2D Graphics
  3. Bitmap

generate Mipmaps For Bound Texture

     
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 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();
    }
  }
  
}








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