Immediate mode GUIs don't necessarily rerender all the pixels every loop iteration either. The thing that gets "redrawn" every loop iteration is the programmati

Immediate mode GUIs don't necessarily rerender all the pixels every loop iteration either. The thing that gets "redrawn" every loop iteration is the programmatic representation of what the UI should look like. Eg every iteration you say "draw a button of this size with this text, then draw a dropdown with this size, then if the button was clicked draw this else draw that, ..." . The library then compares what you want against what's already on screen, and renders the difference.