Posted by Andy Skinner on Jun 14, 2018; 8:03pm
URL: https://forum.jogamp.org/Jogl-Jogamp-on-Java-9-tp4038012p4038934.html

I wrote a simple program that creates a GLJPanel and prints out the surface scale, surface size, and component size.

On Mac with Retina, I get surface scale of 2, and surface size is twice the component size.  (getSurfaceWidth vs getWidth)

On Windows running with Java 10, I still get surface scale of 1 and surface size the same as component size.

My understanding of the Java 9 Windows high DPI change was that Windows would work more like Mac.

My Windows display is set to magnify by 150%.  Should I have seen something like what I saw on mac?

I don't see an attach button, so I'll just give you the code.

thanks
andy

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

import com.jogamp.opengl.*;
import com.jogamp.opengl.awt.*;

public class winHiDPI extends JFrame implements GLEventListener {

    GLJPanel fCanvas;

    winHiDPI() {
        setSize(400,300);

        GLCapabilities caps = new GLCapabilities(null);

        fCanvas = new GLJPanel(caps);
        fCanvas.addGLEventListener(this);
        fCanvas.setAutoSwapBufferMode(true);
        getContentPane().add(fCanvas, BorderLayout.CENTER);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                getContentPane().remove(fCanvas);
            }
        });
    }

    @Override
    public void init(GLAutoDrawable d) {
        final GL2 gl = d.getGL().getGL2();
        gl.glClearColor(1.0f, 1.0f, 0.5f, 1.0f);

        float[] scales = new float[2];
        fCanvas.getCurrentSurfaceScale(scales);
        System.out.println("surface scale: " + scales[0] + " " + scales[1]);
        System.out.println("surface size: " +
                           fCanvas.getSurfaceWidth() + " " + fCanvas.getSurfaceHeight());
        System.out.println("Component size: " +
                           fCanvas.getWidth() + " " + fCanvas.getHeight());
    }
       
    @Override
    public void display(GLAutoDrawable d) {
        final GL2 gl = d.getGL().getGL2();
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        gl.glLoadIdentity();

        gl.glColor3f(0.0f, 0.0f, 1.0f);
        gl.glBegin(GL.GL_TRIANGLES);
        gl.glVertex3f(-0.5f, -0.5f, 0.0f);
        gl.glVertex3f( 0.5f, -0.5f, 0.0f);
        gl.glVertex3f( 0.0f,  0.5f, 0.0f);
        gl.glEnd();
    }

    @Override
    public void reshape(GLAutoDrawable d,int x,int y,int w,int h) {
    }

    @Override
    public void dispose(GLAutoDrawable d) {
    }

    public static void main(String[] args) {
        final winHiDPI frame = new winHiDPI();
        frame.setVisible(true);
    }
}