package com.io7m.jcanephora;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

import javax.media.opengl.DebugGL2;
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GL2ES2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLContext;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.GLProfile;

import com.jogamp.newt.event.WindowAdapter;
import com.jogamp.newt.event.WindowEvent;
import com.jogamp.newt.opengl.GLWindow;

public final class CheckUnits implements GLEventListener
{
  private final GLWindow window;

  CheckUnits()
    throws InterruptedException
  {
    final GLProfile profile = GLProfile.getGL2GL3();
    final GLCapabilities requested_caps = new GLCapabilities(profile);
    requested_caps.setStencilBits(8);
    requested_caps.setDepthBits(24);
    requested_caps.setRedBits(8);
    requested_caps.setBlueBits(8);
    requested_caps.setGreenBits(8);

    this.window = GLWindow.create(requested_caps);
    this.window.setSize(640, 480);
    this.window.setVisible(true);
    this.window.setTitle(this.getClass().getName());
    this.window.addWindowListener(new WindowAdapter() {
      @Override public void windowDestroyNotify(
        @SuppressWarnings("unused") final WindowEvent e)
      {
        System.exit(0);
      }
    });
    this.window.addGLEventListener(this);

    while (this.window.isVisible()) {
      Thread.sleep(100);
    }
  }

  public static void main(
    final String args[])
    throws InterruptedException
  {
    new CheckUnits();
  }

  @Override public void init(
    final GLAutoDrawable drawable)
  {
    final GL2 gl = new DebugGL2(drawable.getGL().getGL2());

    final GLContext context = drawable.getContext();
    System.out.println("VERSION_MAJOR : " + context.getGLVersionMajor());
    System.out.println("VERSION_MINOR : " + context.getGLVersionMinor());
    System.out.println(context.isGLCoreProfile());

    System.out.println("Chosen caps : "
      + this.window.getChosenGLCapabilities());
    System.out.println("INIT GL     : " + gl);
    System.out.println("GL_VENDOR   : " + gl.glGetString(GL.GL_VENDOR));
    System.out.println("GL_RENDERER : " + gl.glGetString(GL.GL_RENDERER));
    System.out.println("GL_VERSION  : " + gl.glGetString(GL.GL_VERSION));

    final ByteBuffer buffer =
      ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder());
    gl.glGetIntegerv(GL2ES2.GL_MAX_TEXTURE_IMAGE_UNITS, buffer.asIntBuffer());

    final int count = buffer.getInt(0);
    System.out.println("GL_MAX_TEXTURE_IMAGE_UNITS: " + count);
  }

  @Override public void dispose(
    final GLAutoDrawable drawable)
  {
    // TODO Auto-generated method stub
  }

  @Override public void display(
    final GLAutoDrawable drawable)
  {
    // TODO Auto-generated method stub
  }

  @Override public void reshape(
    final GLAutoDrawable drawable,
    final int x,
    final int y,
    final int width,
    final int height)
  {
    // TODO Auto-generated method stub
  }
}