console menu/gui

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I kept it simple this time. I have a main loop and it automatically loads a function that displays a 'splash screen', a single image.

I'm working on a function that displays another (full screen) image with a text input, so the user can input whatever text (command) and if it matches and future functions that function will be ran. (for now, just another image)

I want it so the 'console' be activated at any time in the game. From the menu or while running a game world (map) at that users can deactivate it too and continu where they left. (I know of the 'return' command! :) )

The real problem I have is that when I switch (with the tab key) between windows, things go wrong.

For some reason it does not clear the past view and thus not render the new. It has something to do with the buffer I guess ... still, that subject is still quite difficult for me.

Any help?