// ------------------------------------------------------------------
//   Points and Lines example
//   by REAS
//   ported to JOGL by Philipp Seifried

//   all the example specific code in this sketch is to be found at 
//   the beginning of the sketch and in the display() function.

//   Please remember that you will also need the JOGL natives for
//   this to work. For instructions, please refer to
//   http://www.repeatwhiletrue.com/p5/P5JOGL.html
// ------------------------------------------------------------------


Frame oglFrame; // our openGL Window
GLCanvas canvas; // the component openGL will render to
JOGLRenderer renderer; // our custom event listener that will do the rendering
boolean fullscreen;
KeyInputHandler keyHandler;
MouseInputHandler mouseHandler;
int oglMouseX, oglMouseY, oglPMouseX, oglPMouseY;

// ----------------- Add your own stuff here!
// -- this is the original Processing setup code:
/*
int d = 40; 
int p1 = d; 
int p2 = p1+d; 
int p3 = p2+d; 
int p4 = p3+d; 
*/
// -- we will have to modify it in order to adapt to openGLs coordinate system:
// where our original coordinates go from 0 to 200 (the width of the original window), the coordinate system of our openGL window goes from -1 to 1
float d = 0.4; // 200 (the width of the window) / 40 = 5; 2/5 = 0.4
float p1 = -(1-d); // -0.6
float p2 = p1+d; // -0.2
float p3 = p2+d; // 0.2
float p4 = p3+d; // 0.6
// also, I have modified the drawing code (see display() function) to flip the drawing horizontally to make it look like the original example.

// ------------------------------------------

void setup() {

  // ----------------- Add your own stuff here!
  size(320,240);
  fullscreen = false;
  //    ...
  //    ...
  //    ...
  // ------------------------------------------

  // set up our window
  oglFrame = new Frame("Our very own OpenGL Window!");
  oglFrame.setSize( 200, 200 ); // ------------------ size(200,200)

  renderer = new JOGLRenderer();

  // set the properties of our openGL component...
  GLCapabilities glCaps = new GLCapabilities();
  glCaps.setRedBits(8); // 32 bit color resolution
  glCaps.setBlueBits(8);
  glCaps.setGreenBits(8);
  glCaps.setAlphaBits(8);
  glCaps.setDoubleBuffered(true); // double buffered
  canvas = GLDrawableFactory.getFactory().createGLCanvas( glCaps );
  keyHandler = new KeyInputHandler();
  mouseHandler = new MouseInputHandler();
  // add the renderer to the component and the component to our window.
  canvas.addGLEventListener(renderer);
  canvas.addKeyListener(keyHandler);
  canvas.addMouseListener(mouseHandler);
  canvas.addMouseMotionListener(mouseHandler);
  oglFrame.add( canvas );

  // let the program exit if our openGL window is shut down.
  oglFrame.addWindowListener(new WindowAdapter() {
    public void windowClosing(WindowEvent e) {
      if (fullscreen) {
        GraphicsEnvironment ge=null;
        GraphicsDevice gd=null;
        ge = GraphicsEnvironment.getLocalGraphicsEnvironment();  
        gd = ge.getDefaultScreenDevice();  
        if( gd.isFullScreenSupported() )
        {  
          gd.setFullScreenWindow(null);  
        } 
      }
      System.exit(0);
    }
  });


  if (fullscreen) {
    oglFrame.setUndecorated(true); // We don't want any title bar for this window
    GraphicsEnvironment ge=null;
    GraphicsDevice gd=null;
    ge = GraphicsEnvironment.getLocalGraphicsEnvironment();  
    gd = ge.getDefaultScreenDevice();  
    if( gd.isFullScreenSupported() )
    {  
      gd.setFullScreenWindow(oglFrame);  
    } 
  }
  
  // show our openGL window!
  oglFrame.setVisible(true); 
  oglFrame.setFocusable(true);
  oglFrame.requestFocus();
}

void loop() {
  // ----------------- Add your own stuff here!
  //    ...
  //    ...
  //    ...
  // ------------------------------------------
  canvas.display();
}


class JOGLRenderer implements GLEventListener
{
  boolean isFirstFrame;

  public void init(GLDrawable drawable)
  {
    // fetch GL and GLU instances from our GLCanvas
    GL gl = drawable.getGL();
    GLU glu = drawable.getGLU();  
    
    // ----------------- Add your own stuff here!
    //   ...
    // ------------------------------------------
    
  }

  public void display(GLDrawable drawable)
  {
    // -------- this is our render loop!
    GL gl = drawable.getGL(); // gl should be fetched like this in every frame...
    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT ); // clear the screen

    // -------- this is the original Processing drawing code:
    /*
    background(0); 
 
    // Draw gray box 
    stroke(153); 
    line(p3, p3, p2, p3); 
    line(p2, p3, p2, p2); 
    line(p2, p2, p3, p2); 
    line(p3, p2, p3, p3); 
 
    // Draw white points 
    stroke(255); 
    point(p1, p1); 
    point(p1, p3); 
    point(p2, p4); 
    point(p3, p1); 
    point(p4, p2); 
    point(p4, p4); 
    */
    // ------------------------------------------
    
    // ----------------- This is our translation!
    gl.glClearColor(0,0,0,0);
    gl.glClear(GL.GL_COLOR_BUFFER_BIT);
    gl.glColor3f(0.6,0.6,0.6); // 153/255 = 0.6
    gl.glBegin(GL.GL_LINES);
      // line (p3,p3, p2,p3);
      gl.glVertex2f(-p3, p3);
      gl.glVertex2f(-p2, p3);
      // line (p2,p3, p2,p2);
      gl.glVertex2f(-p2, p3);
      gl.glVertex2f(-p2, p2);
      // line (p2,p2, p3,p2);
      gl.glVertex2f(-p2, p2);
      gl.glVertex2f(-p3, p2);
      // line (p3,p2, p3,p3);
      gl.glVertex2f(-p3, p2);
      gl.glVertex2f(-p3, p3);
    gl.glEnd();
    
    gl.glColor3f(1.0,1.0,1.0); // 255/255 = 1.0
    gl.glBegin(GL.GL_POINTS); 
      gl.glVertex2f(p1, p1);
      gl.glVertex2f(p1, p3);
      gl.glVertex2f(p2, p4);
      gl.glVertex2f(p3, p1);
      gl.glVertex2f(p4, p2);
      gl.glVertex2f(p4, p4);
    gl.glEnd();
    // ------------------------------------------
    
    // update the "previous Mouse" positions
    oglPMouseX = oglMouseX;
    oglPMouseY = oglMouseY;
  }

  public void reshape(GLDrawable drawable, int x, int y, int width, int height)
  {
    // -------- this will be called whenever our openGL window is resized!
    GL gl = drawable.getGL(); // gl should be fetched like this in every frame...
    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT ); // clear the screen
  }

  public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged)
  {
    // -------- this is not implemented in JOGL yet. Best to leave it alone.
  }
} 

class KeyInputHandler extends KeyAdapter {
  public void keyPressed(KeyEvent e) {
    key = e.getKeyChar();
    keyPressed = true;
    // ----------------- Add your own stuff here!
    //                 ...
    // ------------------------------------------
  } 
    
  public void keyReleased(KeyEvent e) {			
    key = e.getKeyChar();
    keyPressed = false;
    // ----------------- Add your own stuff here!
    //                 ...
    // ------------------------------------------
  }

  public void keyTyped(KeyEvent e) {
    key = e.getKeyChar();
    if (e.getKeyChar() == 27) { // Escape key closes the application!
      if (fullscreen) {
        GraphicsEnvironment ge=null;
        GraphicsDevice gd=null;
        ge = GraphicsEnvironment.getLocalGraphicsEnvironment();  
        gd = ge.getDefaultScreenDevice();  
        if( gd.isFullScreenSupported() )
        {  
          gd.setFullScreenWindow(null);  
        } 
      }
      System.exit(0);
    }
    // ----------------- Add your own stuff here!
    //                 ...
    // ------------------------------------------
  }
}

class MouseInputHandler extends javax.swing.event.MouseInputAdapter {
  public void mouseDragged(MouseEvent e) {
    oglMouseX = e.getX();
    oglMouseY = e.getY();
    // ----------------- Add your own stuff here!
    //                 ...
    // ------------------------------------------
  }
  public void mouseMoved(MouseEvent e) {
    oglMouseX = e.getX();
    oglMouseY = e.getY();
    // ----------------- Add your own stuff here!
    //                 ...
    // ------------------------------------------
  }
  public void mousePressed(MouseEvent e) {
    oglMouseX = e.getX();
    oglMouseY = e.getY();
    mousePressed = true;
    // ----------------- Add your own stuff here!
    //                 ...
    // ------------------------------------------
  }
  public void mouseReleased(MouseEvent e) {
    oglMouseX = e.getX();
    oglMouseY = e.getY();
    mousePressed = false;
    // ----------------- Add your own stuff here!
    //                 ...
    // ------------------------------------------
  }
  public void mouseClicked(MouseEvent e) {
    oglMouseX = e.getX();
    oglMouseY = e.getY();
    // ----------------- Add your own stuff here!
    //                 ...
    // ------------------------------------------
  }
}

void makeTexture(int textureID, BImage img) {
  makeTexture(textureID, img.pixels, img.width, img.height);
}

void makeTexture(int textureID, int[] imageData, int imageWidth, int imageHeight) {
  java.nio.ByteBuffer imgBuffer = java.nio.ByteBuffer.allocateDirect(imageHeight*imageWidth*4); // create a new direct ByteBuffer with the capacity of the BImage
  imgBuffer.order(java.nio.ByteOrder.nativeOrder()); // Set the byte order of our ByteBuffer
  java.nio.IntBuffer pixelData = imgBuffer.asIntBuffer(); // get an interpretation of the ByteBuffer as an IntBuffer
  pixelData.put(imageData, 0, imageData.length);
  GL gl = canvas.getGL();

  gl.glBindTexture(GL.GL_TEXTURE_2D, textureID );
  gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_REPEAT);
  gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_REPEAT);
  gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);
  gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
  gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGBA, imageWidth, imageHeight, 0, GL.GL_BGRA, GL.GL_UNSIGNED_BYTE, imgBuffer );
}


// -----------------------------------------------------------
// The following two functions have been adapted from a posting by
// keving on the JOGL board. The original post can be found here:
// http://www.javagaming.org/cgi-bin/JGNetForums/YaBB.cgi?board=jogl;action=display;num=1091095319;start=2#2
// -----------------------------------------------------------

int[] copyFrame() { // copies the Frame to an integer array
  int framewidth = canvas.getSize().width; // get the canvas' dimensions
  int frameheight = canvas.getSize().height;
 
  java.nio.ByteBuffer pixelsRGB = BufferUtils.newByteBuffer(framewidth * frameheight * 3); // create a ByteBuffer to hold the image data
  GL gl = canvas.getGL(); // acquire our GL Object
  // read the Frame back into our ByteBuffer
  gl.glReadBuffer(GL.GL_BACK);
  gl.glPixelStorei(GL.GL_PACK_ALIGNMENT, 1);
  gl.glReadPixels(0, 0, framewidth, frameheight, GL.GL_RGB, GL.GL_UNSIGNED_BYTE, pixelsRGB);
 
  int[] pixelInts = new int[framewidth * frameheight];
 
  // Convert RGB bytes to ARGB ints with no transparency. Flip image vertically by reading the
  // rows of pixels in the byte buffer in reverse - (0,0) is at bottom left in OpenGL.
  int p = framewidth * frameheight * 3; // Points to first byte (red) in each row.
  int q;   // Index into ByteBuffer
  int i = 0;   // Index into target int[]
  int w3 = framewidth*3;    // Number of bytes in each row
  for (int row = 0; row < frameheight; row++) {
    p -= w3;
    q = p;
    for (int col = 0; col < framewidth; col++) {
      int iR = pixelsRGB.get(q++);
      int iG = pixelsRGB.get(q++);
      int iB = pixelsRGB.get(q++);
      pixelInts[i++] = 0xFF000000 | ((iR & 0x000000FF) << 16) | ((iG & 0x000000FF) << 8) | (iB & 0x000000FF);
    }
  }
  return pixelInts;
}

void saveFrameAsPNG(String fileName) { // saves a PNG
  File outputFile = new File(fileName); // create a File Object
  int[] pixelInts = copyFrame(); // get the frame's pixel data
  int framewidth = canvas.getSize().width; // get the canvas' dimensions
  int frameheight = canvas.getSize().height;
  // create a new BufferedImage from the pixeldata.
  BufferedImage bufferedImage = new BufferedImage(framewidth, frameheight, BufferedImage.TYPE_INT_ARGB);
  bufferedImage.setRGB(0, 0, framewidth, frameheight, pixelInts, 0, framewidth);
  // write the file.
  try {
    javax.imageio.ImageIO.write(bufferedImage, "PNG", outputFile);
  } catch (IOException e) {
    e.printStackTrace();
  }
}