Android Open Source - aeon_java_android Resource Manager

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
* Aeon Android Game Engine/*  ww w.j a v  a 2s.co m*/
* 
* This file is part of Aeon Android Game Engine (AGE).
*
* AGE 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.
*
* AGE 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 AGE.  If not, see <http://www.gnu.org/licenses/>.
*
* @author Robin Degen
* @version 0.1
*/

package aeon.engine.resources;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import aeon.console.Logger;
import aeon.engine.AeonActivity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class ResourceManager
{
  //TODO: We can move texture loading to another thread and do finalizing (upload to GPU) on the render thread
  public static Texture load_texture(String name)
  {
    Logger.Debug("Loading texture " + name);
    
    Resource resource = __check_if_resource_loaded(name, ResourceType.Texture);
    
    //If the resource was already loaded, return that one.
    if(resource != null)
    {
      Logger.Debug("Texture " + name + " was already loaded. Reusing resource");
      return (Texture) resource;
    }
      
    Bitmap bitmap = read_asset_as_bitmap(name);
    
    if(bitmap == null)
    {
      Logger.Error("Texture " + name + " failed to load.");
      return null;
    }
    
    Texture texture = new Texture(bitmap);
    
    __register_resource(name, texture);
    
    return texture;
  }
  
  public static Shader load_shader(String name)
  {
    Logger.Debug("Loading shader " + name);
    
    Resource resource = __check_if_resource_loaded(name, ResourceType.Texture);
    
    //If the resource was already loaded, return that one.
    if(resource != null)
    {
      Logger.Debug("Shader " + name + " was already loaded. Reusing resource");
      return (Shader) resource;
    }
      
    Shader shader = new Shader();
    
    //Load the shader and check the result
    if(!shader.load(name))
    {
      Logger.Error("Shader " + name + " failed to load.");
      return null;
    }
      
    __register_resource(name, shader);
    
    return shader;
  }

  public static String read_asset_as_string(String filename)
  {  
    try
    {
      InputStream stream = AeonActivity.get_singleton().getAssets().open(filename);
          int size = stream.available();
          byte[] buffer = new byte[size];
          stream.read(buffer);
          stream.close();
          
          String file_contents = new String(buffer);
          
          return file_contents;
    }
    catch (Exception e)
    {
      Logger.Error(String.format("Could not read asset %s as string.", filename));
      e.printStackTrace();
    }
    
    return null;
  }
  
  public static Bitmap read_asset_as_bitmap(String filename)
  {
    try
    {
      InputStream stream = AeonActivity.get_singleton().getAssets().open(filename);
      Bitmap bitmap = BitmapFactory.decodeStream(stream);
      
      return bitmap;
      }
      catch (Exception e)
      {
      Logger.Error(String.format("Could not read asset %s as bitmap.", filename));
      e.printStackTrace();
      }

      return null;
  }
  
  private static Resource __check_if_resource_loaded(String name, ResourceType type)
  {
    //See if the resource is loaded already
    Resource resource = m_loaded_resources.get(name);
    
    //The resource was not loaded before.
    if(resource == null)
      return null;
    
    //Is the resource still loaded?
    if(!resource.loaded())
    {
      //Remove it from the list.. no need to keep it around
      m_loaded_resources.remove(name);
      return null;
    }
    
    //Is the loaded resource of the same type?
    if(resource.type() != type)
    {
      Logger.Warning(
        String.format(
          "Resource type was not equal to previous load. Can't load resource %s.",
          name
        )
      );
      
      return null;
    }
    
    //We found it! This means we can reuse it.
    return resource;
  }
  
  private static void __register_resource(String name, Resource resource)
  {
    Resource previous_resource = m_loaded_resources.put(name, resource);
    
    //If put returns != null, then the key was already present.. that should not happen in our case though...
    if(previous_resource != null)
    {
      Logger.Error(
        String.format(
          "Resource %s was loaded twice somehow. Old resource was overwritten. This should never happen.",
          name
        )
      );
    }
  }
  
  private static Map<String, Resource> m_loaded_resources = new HashMap<String, Resource>();
}

Java Source Code List

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