I started using ControlP5, but then I realized he's writing directly on top of the PGraphics so I compiled a new library of it that writes to an GLGraphicsOffScreen, then I found out that I needed some other controllers that weren't in the ControlP5 library and started writing my own, but soon I realized the work to make it perfect with all the customizations needed was too extensive.

Hence the question in the first place. :-)

I found  this workaround from  jeff_g that creates a JPopupMenu and places a JEditorPane inside of it.

I've tweaked it a bit to show a JTextField in a JDialog instead on top of my own OPENGL sketch, just to show how it can be achieved.

Hope it's of use to some!

1. import javax.swing.JDialog;
2. import javax.swing.JTextField;
3. 
   
4. import java.awt.Point;
5. import java.awt.Insets;
6. import java.awt.event.ActionEvent;
7. import java.awt.event.ActionListener;
8. 
   
9. import processing.core.PApplet;
10. 
    
11. public class Jogl2 extends PApplet {
12. 
    
13. /**
14. * 
15. */
16. private static final long serialVersionUID = -2713698961386189021L;
17. 
    
18. private SwingGUI gui;
19. 
    
20. @Override
21. public void setup() {
22. size(1024, 768, OPENGL);
24. gui = new SwingGUI(this, 100, 100, 300, 34);
25. gui.setVisible(true);
26. }
27. 
    
28. @Override
29. public void draw() {
30. background(100);
31. }
32. 
    
33. class SwingGUI {
35. private PApplet parent;
36. private JDialog jm = new JDialog();
37. private JTextField panel;
38. 
    
39. /** Creates new form GUI */
40. public SwingGUI(PApplet parent, int x, int y, int w, int h) {
41. this.parent = parent;
43. panel = new JTextField("some value", 16);
44. panel.setMargin(new Insets(5, 2, 5, 5));
45. panel.addActionListener(new ActionListener() {
46. @Override
47. public void actionPerformed(ActionEvent e) {
48. System.out.println("Text: " + panel.getText());
49. }
50. });
52. jm.add(panel);
53. jm.setResizable(false);
54. jm.setUndecorated(true);
55. jm.setAlwaysOnTop(true);
56. 
    
57. setLocation(x, y);
58. setSize(w, h);
59. }
60. 
    
61. void setVisible(boolean visible) {
62. jm.setVisible(visible);
63. }
64. 
    
65. boolean isVisible() {
66. return jm.isVisible();
67. }
68. 
    
69. void setSize(int w, int h) {
70. jm.setSize(w, h);
71. }
72. 
    
73. void setLocation(int x, int y) {
74. Point p = parent.frame.getLocation();
75. jm.setLocation(p.x + x, p.y + y);
76. }
77. 
    
78. }
79. 
    
80. /**
81. * @param args
82. */
83. static public void main(String args[]) {
84. PApplet.main(new String[] { jogl2.Jogl2.class.getName() });
85. }
86. 
    
87. }