Posted by jeffreportmill on Apr 22, 2022; 10:36pm
URL: https://forum.jogamp.org/GL-BufferedImage-tp4041732.html

What is the best way to effectively get a BufferedImage from OpenGL code?

My best take on it is to create a GLWindow auto drawable and try to move it offscreen, then use AWTGLReadBufferUtil to read from it after display:

[Edit: Update URL:] https://github.com/reportmill/SnapKitGL/blob/main/src/snapgl/RenderImage.java

This has been working for me, with JOGL 2.3.2 and Java 8 on Apple M1. However, I have been having a devil of a time trying to upgrade to Java 11 and JOGL 2.4. GLWindow.create() seems to crash the JRE:

>> A fatal error has been detected by the Java Runtime Environment:
j  java.lang.Class.forName(Ljava/lang/String;)Ljava/lang/Class;+11 java.base@11.0.14
j  com.jogamp.newt.NewtFactory.getCustomClass(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/Class;+76
j  jogamp.newt.DisplayImpl.getDisplayClass(Ljava/lang/String;)Ljava/lang/Class;+3
j  jogamp.newt.DisplayImpl.create(Ljava/lang/String;Ljava/lang/String;JZ)Lcom/jogamp/newt/Display;+1

Much of my research ends up with references that are years old. Is JOGL no longer being maintained and updated? Is there a better option for Java + OpenGL? I don't mean to complain - I know it's hard work (beyond my knowledge and skill set). I just thought there would be commercial entities interested in keeping some Java OpenGL solution alive and up to date.

My work doesn't make any money, but I can compile my Java work to the desktop and web. Unfortunately, my OpenGL desktop work is more unreliable than the web:

    SnapCharts: https://reportmill.com/snaptea/SnapCharts/
    (Click on 'show samples' and choose Sample 3D)



jeff