Android Open Source - Look Texture Factory

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License

The source code is released under:

====================== LOOK! LICENSING TERMS ====================== look! is licensed under the BSD 3-Clause (also known as "BSD New" or "BSD Simplified"), as follows: Copyright (c) 2010-2012, Look...

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Java Source Code

/**
*-----------------------------------------------------------------------------
* Copyright (c) 2012, Look! Development Team
* All rights reserved.//from ww  w  .  ja  v a 2 s .  co m
*
* Distributed under the terms of the BSD Simplified License.
*
* The full license is in the LICENSE file, distributed with this software.
*-----------------------------------------------------------------------------
*/
package es.ucm.look.ar.ar3D.core;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import javax.microedition.khronos.opengles.GL10;

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

/**
 * Holds all textures manipulation
 * 
 * @author ??ngel Serrano
 * 
 */
public class TextureFactory {

  /**
   * Map for textures of app resources
   */
  private Map<Integer, Integer> textures;

  /**
   * Map for textures of external resources
   */
  private Map<String, Integer> texturesURI;

  /**
   * Singleton instance
   */
  private static TextureFactory instance;

  /**
   * App context
   */
  private Context c;

  /**
   * GL10 context to generate the textures
   */
  private GL10 gl;

  /**
   * Constructor
   * 
   * @param c
   *            App context
   * @param gl
   *            GL10 context to generate the textures
   */
  private TextureFactory(Context c, GL10 gl) {
    this.c = c;
    this.gl = gl;
    textures = new HashMap<Integer, Integer>();
    texturesURI = new HashMap<String, Integer>();
  }

  /**
   * Initializes texture factory instance
   * 
   * @param c
   *            App context
   * @param gl
   *            GL10 context to generate the textures
   */
  public static void init(Context c, GL10 gl) {
    instance = new TextureFactory(c, gl);
  }

  /**
   * Returns an instance of TextureFactory
   * 
   * @return an instance of TextureFactory
   */
  public static TextureFactory getInstance() {
    return instance;
  }

  /**
   * Returns the texture id for an URI. This id can be bind whit
   * {@link GL10#glBindTexture(int, int)}
   * 
   * @param uri
   *            the absolute uri for the resource
   * @return the texture name or id
   */
  public int getTexture(String uri) {
    if (texturesURI.containsKey(uri)) {
      return texturesURI.get(uri);
    } else {
      try {
        FileInputStream is = new FileInputStream(uri);
        int t = generateTexture(is);
        texturesURI.put(uri, t);
        return t;
      } catch (FileNotFoundException e) {
        e.printStackTrace();
        return 0;
      }
    }

  }

  /**
   * Returns the texture id for an app resource. This id can be bind whit
   * {@link GL10#glBindTexture(int, int)}
   * 
   * @param id
   *            the resource id
   * @return the texture name or id
   */
  public int getTexture(int id) {
    Integer idI = new Integer(id);
    if (textures.containsKey(idI)) {
      return textures.get(idI).intValue();
    } else {
      InputStream is = c.getResources().openRawResource(id);
      int texture = generateTexture(is);
      textures.put(new Integer(id), new Integer(texture));
      return texture;
    }
  }

  /**
   * Generate a texture name for the given InputStream
   * 
   * @param is
   *            the input stream
   * @return the texture name or id
   */
  private int generateTexture(InputStream is) {
    

    Bitmap bitmap = null;
    try {
      bitmap = BitmapFactory.decodeStream(is);

    } finally {
      try {
        is.close();
        is = null;
      } catch (IOException e) {
      }
    }

    return getTexture(bitmap, true);

  }

  public int getTexture(Bitmap bitmap, boolean recycle ) {
    int[] textures = new int[1];
    gl.glGenTextures(1, textures, 0);
    gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);

    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);

    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_REPEAT);
    gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT);

    GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
    
    if ( recycle )
      bitmap.recycle();
    
    return textures[0];
  }

}

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