Android Open Source - clash_of_balls Texture Helper

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Back to project page clash_of_balls.

License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * Copyright (C) 2012-2013 Hans Hardmeier <hanshardmeier@gmail.com>
 * Copyright (C) 2012-2013 Andrin Jenal/*from   w w  w  . ja  va 2  s.c o  m*/
 * Copyright (C) 2012-2013 Beat Kng <beat-kueng@gmx.net>
 * 
 * This program 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; version 3 of the License.
 * 
 * This program 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.
 *
 */

package com.sapos_aplastados.game.clash_of_balls.helper;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.opengl.GLES20;
import android.opengl.GLUtils;

public class TextureHelper
{
    
  public static int loadTexture(final Context context, final int resourceId
      , boolean use_mipmapping)
  {
    final int textureHandle;
    
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inScaled = false;  // No pre-scaling

    // Read in the resource
    final Bitmap loaded_bitmap = BitmapFactory.decodeResource(
        context.getResources(), resourceId, options);

    textureHandle = loadTextureFromBitmap(loaded_bitmap, use_mipmapping);

    // Recycle the bitmap, since its data has been loaded into OpenGL.
    loaded_bitmap.recycle();
    
    return textureHandle;
  }
  
  public static int loadTextureFromBitmap(Bitmap bitmap, boolean use_mipmapping) {

    final int[] textureHandle = new int[1];
    
    GLES20.glGenTextures(1, textureHandle, 0);
    
    if (textureHandle[0] != 0)
    {
      
      // Flip bitmap upside down
      Matrix flip = new Matrix();
      flip.postScale(1f, -1f);
      final Bitmap bitmap_final = Bitmap.createBitmap(bitmap, 0, 0
          , bitmap.getWidth(), bitmap.getHeight(), flip, true);
      
      // Bind to the texture in OpenGL
      GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle[0]);
      
      // Set filtering
      
      GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
      GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
      
      if(use_mipmapping) {
        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
      } else {
        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
      }
      
      // Load the bitmap into the bound texture.
      GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap_final, 0);
      
      if(use_mipmapping)
        GLES20.glGenerateMipmap(GLES20.GL_TEXTURE_2D);
            
      // Recycle the bitmap, since its data has been loaded into OpenGL.
      bitmap_final.recycle();
    }

    if (textureHandle[0] == 0)
    {
      throw new RuntimeException("Error loading texture.");
    }
    
    return textureHandle[0];
  }
}

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