package jogl.test;

import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2;
import com.jogamp.opengl.GL2ES1;
import com.jogamp.opengl.GLAutoDrawable;
import com.jogamp.opengl.GLEventListener;
import com.jogamp.opengl.awt.GLCanvas;
import com.jogamp.opengl.fixedfunc.GLLightingFunc;
import com.jogamp.opengl.fixedfunc.GLMatrixFunc;
import com.jogamp.opengl.util.Animator;

/**
 * Self-contained example (within a single class only to keep it simple)
 * displaying a rotating quad
 */
public class JOGLQuad implements GLEventListener
{

  private float rotateT = 0.0f;

  @Override
  public void display(GLAutoDrawable gLDrawable)
  {
    final GL2 gl = gLDrawable.getGL().getGL2();
    gl.glClear(GL.GL_COLOR_BUFFER_BIT);
    gl.glClear(GL.GL_DEPTH_BUFFER_BIT);
    gl.glLoadIdentity();
    gl.glTranslatef(0.0f, 0.0f, -5.0f);

    // rotate about the three axes
    gl.glRotatef(rotateT, 1.0f, 0.0f, 0.0f);
    gl.glRotatef(rotateT, 0.0f, 1.0f, 0.0f);
    gl.glRotatef(rotateT, 0.0f, 0.0f, 1.0f);

    // Draw A Quad
    gl.glBegin(GL2.GL_QUADS);
    gl.glColor3f(0.0f, 1.0f, 1.0f); // set the color of the quad
    gl.glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
    gl.glVertex3f(1.0f, 1.0f, 0.0f); // Top Right
    gl.glVertex3f(1.0f, -1.0f, 0.0f); // Bottom Right
    gl.glVertex3f(-1.0f, -1.0f, 0.0f); // Bottom Left
    // Done Drawing The Quad
    gl.glEnd();

    // increasing rotation for the next iteration
    rotateT += 0.2f;
  }

  @Override
  public void init(GLAutoDrawable glDrawable)
  {
    GL2 gl = glDrawable.getGL().getGL2();
    gl.glShadeModel(GLLightingFunc.GL_SMOOTH);
    gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    gl.glClearDepth(1.0f);
    gl.glEnable(GL.GL_DEPTH_TEST);
    gl.glDepthFunc(GL.GL_LEQUAL);
    gl.glHint(GL2ES1.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST);
  }

  @Override
  public void reshape(GLAutoDrawable gLDrawable, int x, int y, int width, int height)
  {
    GL2 gl = gLDrawable.getGL().getGL2();
    final float aspect = (float) width / (float) height;
    gl.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
    gl.glLoadIdentity();
    final float fh = 0.5f;
    final float fw = fh * aspect;
    gl.glFrustumf(-fw, fw, -fh, fh, 1.0f, 1000.0f);
    gl.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
    gl.glLoadIdentity();
  }

  @Override
  public void dispose(GLAutoDrawable gLDrawable)
  {}

  public static void main(String[] args)
  {
    // System.setProperty("sun.awt.noerasebackground", "true");
    final GLCanvas canvas = new GLCanvas();
    final Frame frame = new Frame("Jogl Quad drawing");
    final Animator animator = new Animator(canvas);
    canvas.addGLEventListener(new JOGLQuad());
    frame.add(canvas);
    frame.setSize(640, 480);
    // frame.setResizable(false);
    frame.addWindowListener(new WindowAdapter()
    {
      @Override
      public void windowClosing(WindowEvent e)
      {
        animator.stop();
        frame.dispose();
        System.exit(0);
      }
    });
    frame.setVisible(true);
    animator.start();
    canvas.requestFocus();
  }
}