Posted by gouessej on Dec 05, 2023; 9:46am
URL: https://forum.jogamp.org/flipping-textures-with-awtTextureIO-tp4043152p4043198.html

Sorry, I forgot that:
https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/util/awt/ImageUtil.html#flipImageVertically(java.awt.image.BufferedImage)

It flips the image vertically, you don't have to roll your own. Does it help?