Linux and Xorg hardware acceleration

[BlueMooneke]

Hello everybody!

As I recently got stuck with my software development for Raspberry Pi, I started wondering about GPU related stuff and Xorg etc on linux distro's.
From what I found, I am in trouble

 

Now, I develop in Free Pascal, a long forgotten language I guess but I like it because of it's portability. Now, if I create a dialog or a form in there, how does Xorg gets it on the screen? Is this the same in all linux distro's? Because, on the Pi, Xorg (Raspbian) uses the CPU while I need that CPU for other calculations...

I've read many forums about GPU support for Xorg for the Pi, and as some might be coming, I need a solution quicker.

Now, the actual question: if I, for example, buy another small board, concrete example CuBox-i2eX, and run my program, will it still hog the CPU or not?
I guess that depends if Xorg has access to the GPU (2- and 3D acceleration?) or doesn't that have any relation? Than, is it possible to make the windows move, pop-up, fade out,... smoothly on ANY linux distro that runs on a small device without a big and powerful CPU? (but with a decent GPU)

I hope my question is clear

Thanks in advance and let me know if you need some extra information!

[ManWithBeard1990]

Xorg is just the window manager. What actually does most of the work drawing the stuff is the compositor, theming engine and so forth. On Kubuntu, the OS I use, it supports OpenGL. The Raspberry Pi however has OpenGL ES which is an embedded version. I'm not so sure how many systems actually use that.

[BlueMooneke]

So that means that any GPU that supports OpenGL will be used when running KDE on it for displaying the windows, theme's,...?