Android Open Source - tag-augmented-reality-android Load From Assets

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The source code is released under:
MIT License
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Java Source Code

/**
The MIT License (MIT)//from w  w  w.j  av  a2s.co m

Copyright (c) 2014 MN Tech Solutions
Copyright (c) 2014 tagAugmentedReality
Copyright (c) 2014 Mustafa Neguib

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/


package com.tagaugmentedreality.openglobjectloader;


import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import android.content.res.AssetManager;
import android.util.Log;

public class LoadFromAssets {
  
  
  public static String loadTextFile(InputStream inputStream) throws IOException {
  ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
  byte[] bytes = new byte[4096];
  int len = 0;
  while ((len = inputStream.read(bytes)) > 0)
  byteStream.write(bytes, 0, len);
  return new String(byteStream.toByteArray(), "UTF8");
  }
  
    
  public static ModelData loadFromAsset(String assetName,int textureImageResourceId,AssetManager assetManager)
  {//this function gets the data from the assets and then returns the ModelData object which contains
      
    InputStream inputStream = null;
    ModelData modelData=new ModelData(null,null,null,textureImageResourceId);
    
    try {
    inputStream = assetManager.open(assetName);
    String text = loadTextFile(inputStream);
    String text1;
    List<String> lines=new ArrayList<String>();
    
    
    int index=0,index1=0,numOfLines=0;
    
    
    
    
    while(index<text.length())
      {
      index1=text.indexOf("\n",index);
      text1=text.substring(index,index1);
      lines.add(text1);
      index=index1+1;
      numOfLines++;

      
    }//end while
    
    
    float[] vertices = new float[numOfLines*3];
    int [] faces = new int[numOfLines * 3];
    float [] vertexBuffer;
    
    
    int numVertices = 0;
    int numFaces = 0;
    int numTextures=0;
    
    float[] textures1 = new float[numOfLines*3];
    float [] textureBuffer;
    short[] facesBuffer; 
    
    String line=null;  
    int vertexIndex=0, facesIndex=0, texIndex=0;
    String[] tokens=null;
    String[] tokens1=null;
    
    
    for (int i = 0; i < lines.size(); i++) {
    
    line=lines.get(i);
    
    if (line.startsWith("v ")) 
    {
      tokens = line.split(" ");//at index 0 is v
      vertices[vertexIndex] = Float.parseFloat(tokens[1]);
      vertices[vertexIndex + 1] = Float.parseFloat(tokens[2]);
      vertices[vertexIndex + 2] = Float.parseFloat(tokens[3]);
      vertexIndex += 3;
      numVertices++;
      
      }//end if
    if (line.startsWith("vt ")) 
    {
      tokens = line.split(" ");//at index 0 is vt
      textures1[texIndex] = Float.parseFloat(tokens[1]);
      textures1[texIndex + 1] = Float.parseFloat(tokens[2]);

      texIndex += 2;
      numTextures++;
      
      }//end if
    else if(line.startsWith("f "))
    {
      tokens=line.split(" ");
      tokens1=tokens[1].split("/");//element at location 0 is f
      faces[facesIndex]=Integer.parseInt(tokens1[0]);
      tokens1=tokens[2].split("/");//element at location 0 is f
      faces[facesIndex+1]=Integer.parseInt(tokens1[0]);
      tokens1=tokens[3].split("/");//element at location 0 is f
      faces[facesIndex+2]=Integer.parseInt(tokens1[0]);
      
      facesIndex += 3;//this is keeping track of how many vertices are in the faces array, that i will need to create the vertexBuffer array
      numFaces++;//i am using the file test2.obj, and in it there are 6 vertices in the faces triangles, or 2 faces(triangles). 
    }//end else if
    
        
    }//end for
    
    textureBuffer=new float[numTextures*3];
    vertexBuffer=new float[numVertices*3];//i want the size of the final array to be equal to the number of faces times 3 because i have 3 components. ie. x,y,z
    //there will be number of facesIndex vertices in the shape defined. for example, there will be 6 vertices to define the 2 triangles which will make up the square.
    facesBuffer = new short[numFaces*3];
     int i=0;
    
     
      for(i=0;i<vertexBuffer.length;i++)
      {
          vertexBuffer[i]=vertices[i];
        
      }//end for
      
      
      for(i=0;i<textureBuffer.length;i++)
      {
          textureBuffer[i]=textures1[i];
        
      }//end for
      
      for(i=0;i<facesBuffer.length;i++)
      {
          facesBuffer[i]=(short) (faces[i]-1);
      
      }//end for
             
      
      modelData.setVertexBuffer(vertexBuffer);
      modelData.setTextureBuffer(textureBuffer);
      modelData.setFacesBuffer(facesBuffer);
      
      
      return modelData;
      
    
    }//end try
    catch (IOException e) 
    {
    //Couldn't load file
      Log.v("Could not load file", " ");
      return null;
      
    }//end catch
    finally
    {
    if (inputStream != null)
    {
      try 
      {
      inputStream.close();
      }//end try 
      catch (IOException e) 
      {//Couldn't close file
        Log.v("Could not close file", " ");
        return null;
      }//end catch
    }//end if
  }//end finally
    
  }
  
  
}
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