// JOGLQuad.java
// Julien Gouesse
// https://jogamp.org/wiki/index.php/Rudimentary_standalone_example_using_the_fixed_pipeline_by_Julien_Gouesse
// Slightly modified by Andrew Davison, ad@coe.psu.ac.th, Feb 2023

/* Self-contained example displaying a skyblue quad
   rotating against a black background. Useful for
   testing the JOGL components of Jzy3D.

   Information about JOGL and the platform are printed before
   rendering is started.

   Usage:
    > compile JOGLQuad.java
    > run JOGLQuad
*/

import java.awt.*;
import java.awt.event.*;

import com.jogamp.opengl.*;
import com.jogamp.opengl.awt.GLCanvas;
import com.jogamp.opengl.fixedfunc.*;
import com.jogamp.opengl.util.Animator;

import com.jogamp.opengl.JoglVersion;
import com.jogamp.common.GlueGenVersion;
import com.jogamp.common.util.VersionUtil;
import com.jogamp.nativewindow.NativeWindowVersion;


public class JOGLQuad implements GLEventListener
{
  private float angle = 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(angle, 1.0f, 0.0f, 0.0f);
    gl.glRotatef(angle, 0.0f, 1.0f, 0.0f);
    gl.glRotatef(angle, 0.0f, 0.0f, 1.0f);

    // draw a quad
    gl.glBegin(GL2.GL_QUADS);

    gl.glColor3f(0.0f, 1.0f, 1.0f);   // sky blue
    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

    gl.glEnd();

    // increase angle for the next call to display()
    angle += 0.2f;
  } /* display */


  @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);
  } /* init */


  @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();
  } /* reshape */


  @Override
  public void dispose(GLAutoDrawable gLDrawable) { }


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

  public static void main(String[] args)
  {
    JOGLInfo();   // added by ad

    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() {
      public void windowClosing(WindowEvent e) {
        animator.stop();
        frame.dispose();
        System.exit(0);
      }
    });
    frame.setVisible(true);
    animator.start();
    canvas.requestFocus();
  } /* main */


  private static void JOGLInfo()
  // useful info, es[pecially if the rest of the code does not run
  {
    System.out.println("Jogl Version: " + JoglVersion.getInstance());

    System.out.println();
    System.out.println("Platform Info: " + VersionUtil.getPlatformInfo());

    System.out.println();
    System.out.println("GLProfile Default Device: " + 
                                GLProfile.getDefaultDevice());
    System.out.println("GLProfile Default: " + 
                                GLProfile.getDefault());

    System.out.println();
  }  // end of JOGLInfo()


}  // end of JOGLQuad class