I'm studying time stepping algorithm and I need to know how delta time works in libgdx, because I think delta time uses some kind of time stepping algorithm.
libgdx seems, based on the source, to compute delta time with some variant of
long time = System.nanoTime(); deltaTime = (time - lastFrameTime) / 1000000000.0f; lastFrameTime = time;
for every back-end renderer implementation. This is usually done when the renderer is ticked (the view is drawn, effectively). There doesn't appear to be any time-stepping going on.