migrating my app from GTK3 to GTK4 I noticed a difference with the behaviour of GtkGLarea between GTK3 and GTK4, and I would appreciate to have your thoughts on that matter.
To be precise everything is working fine, I am able to render my models without any issues, see here the GTK3 version (left) and the GTK4 version (right):
However when I change the opacity of the model (0.5 in the example bellow, as opposed to 1.0 above) something of is happening and I am puzzled to figure out where this issue is coming from:
Obviously the code is the same, the shaders are the same, I checked and compared the materials, lights and other OpenGL parameters before rendering the models, all are identical … so can this difference be explained by a change in the implementation of the GtkGLarea Widget in the new API ?
Thanks in advance for your lights.