OpenGL Utils : OpenGL « 2D Graphics « Android

1. Android
2. 2D Graphics
3. OpenGL

OpenGL Utils

   
//package com.akjava.lib.android.opengl;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;

import javax.microedition.khronos.opengles.GL10;
//import javax.swing.text.html.Option;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.opengl.GLUtils;
import android.util.Log;

public class OpenGLUtils {

  public static FloatBuffer allocateFloatBuffer(int capacity){
    ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
        vbb.order(ByteOrder.nativeOrder());
        return vbb.asFloatBuffer();
  }
  
  public static IntBuffer allocateInttBuffer(int capacity){
    ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
        vbb.order(ByteOrder.nativeOrder());
        return vbb.asIntBuffer();
  }
  
  public static ShortBuffer allocateShortBuffer(int capacity){
    ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
        vbb.order(ByteOrder.nativeOrder());
        return vbb.asShortBuffer();
  }
  
  public static void addVertex3f(FloatBuffer buffer,float x,float y,float z){
    buffer.put(x);
    buffer.put(y);
    buffer.put(z);
  }
  
  public static void addIndex(ShortBuffer buffer,int index1,int index2,int index3){
    buffer.put((short) index1);
    buffer.put((short) index2);
    buffer.put((short) index3);
  }
  
  public static void addCoord2f(FloatBuffer buffer,float x,float y){
    buffer.put(x);
    buffer.put(y);
  }
  
  public static void addColorf(FloatBuffer buffer,float r,float g,float b,float a){
    buffer.put(r);
    buffer.put(g);
    buffer.put(b);
    buffer.put(a);
  }

  public static FloatBuffer toFloatBufferPositionZero(float[] values) {
    ByteBuffer vbb = ByteBuffer.allocateDirect(values.length*4);
        vbb.order(ByteOrder.nativeOrder());
        FloatBuffer buffer=vbb.asFloatBuffer();
        buffer.put(values);
        buffer.position(0);
    return buffer;
  }
  
  public static ShortBuffer toShortBuffer(short[] values) {
    ByteBuffer vbb = ByteBuffer.allocateDirect(values.length*2);
        vbb.order(ByteOrder.nativeOrder());
        ShortBuffer buffer=vbb.asShortBuffer();
        buffer.put(values);
        buffer.position(0);
    return buffer;
  }
  
  
  public static Bitmap loadBitmap(Context mContext,int id){
    Options opt=new Options();
    Bitmap bitmap= BitmapFactory.decodeResource(mContext.getResources(), id,opt);  
    
    System.out.println(bitmap.getConfig());
    if(!sizeCheck(bitmap)){
      throw new RuntimeException("width or height not 2x size,it make invalid error on OpenGL:"+id);
    }
    return bitmap;
  }
  private static boolean sizeCheck(Bitmap bitmap){
    boolean ret=true;
    int t=2;
    int w=bitmap.getWidth();
    
    while(w!=t){
      if(w%t==1){
        Log.e("glutils w=",w+","+t);
        return false;
      }
      t*=2;
      if(t>w){
        return false;
      }
    }
    
    t=2;
    int h=bitmap.getHeight();
    while(h!=t){
      if(h%t==1){
        Log.e("glutils h=",h+","+t);
        return false;
      }
      t*=2;
      if(t>h){
        return false;
      }
    }
    
    return ret;
  }
  
  /**
   * this is for  resized
   * GLU.gluOrtho2D (gl,-1f, 1.0f, -1f, 1.0f);
   * @param x
   * @param y
   * @param screenWidth
   * @param screenHeight
   * @return
   */
  public static float[] toOpenGLCordinate(float x,float y,int screenWidth,int screenHeight){
    float sx=((float)x/screenWidth)*2-1.0f;
      float sy=((float)y/screenHeight)*2-1.0f;
      sy*=-1;
      return new float[]{sx,sy};
  }
  
  /*
   * y should *=-1;
   */
  public static float toOpenGLCordinate(float x,int screenWidth){
    Log.i("myapp","x="+x+","+screenWidth);
    float sx=((float)x/screenWidth)*2-1.0f;
      return sx;
  }
  
  
  public static float realToVirtialValue(int x,int real,float virtial){
      return virtial/real*x;
  }
  
  public static int virtualToRealvalue(float x,int real,float virtial){
    //using DecimalFormat make gc
      return (int) ((float)x/(virtial/real));
  }
  
  
  private static FloatBuffer mTextureBuffer;
  private static FloatBuffer mFVertexBuffer;
  private static ShortBuffer mIndexBuffer;
  
  public static FloatBuffer getBoxTriangleTextureBuffer(){
    if(mTextureBuffer==null){
      mTextureBuffer=OpenGLUtils.allocateFloatBuffer(4*6*2);
      OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 1.0f); 
      OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 0.0f); 
      OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 1.0f); 
      OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 1.0f); 
        OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 0.0f); 
        OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 0.0f); 
        mTextureBuffer.position(0);
    }
    return mTextureBuffer;
  }
  
  
  public static FloatBuffer getBoxTriangleFlipVerticalTextureBuffer(){
    if(mTextureBuffer==null){
      mTextureBuffer=OpenGLUtils.allocateFloatBuffer(4*6*2);
      OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 0.0f); 
      OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 1.0f); 
      OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 0.0f); 
      OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 0.0f); 
        OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 1.0f); 
        OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 1.0f); 
        mTextureBuffer.position(0);
    }
    return mTextureBuffer;
  }
  
  public static FloatBuffer getBoxTextureBuffer(){
    if(mTextureBuffer==null){
      mTextureBuffer=OpenGLUtils.allocateFloatBuffer(4*4*2);
      OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 0.0f); 
      OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 1.0f); 
      OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 0.0f); 
        OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 1.0f); 
        mTextureBuffer.position(0);
    }
    return mTextureBuffer;
  }
  public static ShortBuffer getBoxIndexBuffer(){
    if(mIndexBuffer==null){
      mIndexBuffer=OpenGLUtils.allocateShortBuffer(6*2);
        mIndexBuffer.put((short)0);
        mIndexBuffer.put((short)1);
        mIndexBuffer.put((short)2);
        mIndexBuffer.put((short)2);
        mIndexBuffer.put((short)3);
        mIndexBuffer.put((short)1);
        mIndexBuffer.position(0);
    }
    return mIndexBuffer;
  }
  public static FloatBuffer getBoxVertexBuffer(){
    if(mFVertexBuffer==null){
      mFVertexBuffer=OpenGLUtils.allocateFloatBuffer(4*4*3);
        OpenGLUtils.addVertex3f(mFVertexBuffer, -1,-1f,0);
          OpenGLUtils.addVertex3f(mFVertexBuffer, -1,1f,0);
          
          
          OpenGLUtils.addVertex3f(mFVertexBuffer, 1,-1f,0);
          OpenGLUtils.addVertex3f(mFVertexBuffer, 1,1f,0);  
          mFVertexBuffer.position(0);
          
    }
    return mFVertexBuffer;
  }
  
  
  public static FloatBuffer getBoxTriangleVertexBuffer(){
    if(mFVertexBuffer==null){
      mFVertexBuffer=OpenGLUtils.allocateFloatBuffer(4*6*3);
      OpenGLUtils.addVertex3f(mFVertexBuffer, -1,-1f,0);
          OpenGLUtils.addVertex3f(mFVertexBuffer, -1,1f,0);
          OpenGLUtils.addVertex3f(mFVertexBuffer, 1,-1f,0);
         
          OpenGLUtils.addVertex3f(mFVertexBuffer, 1,-1f,0);
          OpenGLUtils.addVertex3f(mFVertexBuffer, 1,1f,0); 
          OpenGLUtils.addVertex3f(mFVertexBuffer, -1,1f,0);
          
          mFVertexBuffer.position(0);
          
    }
    return mFVertexBuffer;
  }
  
  //TODO ??????????????
  /*
   * bitmap???????????
   */
  public static void bindTextureImage(GL10 gl,final int id,final Bitmap bitmap){
       gl.glBindTexture(GL10.GL_TEXTURE_2D,  id);
         gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE);
       gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE);
       gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_NEAREST);
       gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
      GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
      bitmap.recycle();
  }
  
}

   
    
    
  

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