Run both in cpu and graphics card.

Hello!

Is there possible to control what controls the process?
Like somehow switching from graphics card to cpu and vice versa.
Basically i changed in my nvidia control panel
that my app will be run in nvidia and my fps turn to be 600-800.
If i run cpu mode fps will be 1000 or more.

Im coding game engine and i have actually no idea what is graphics card for...
Im feeling like it doesnt use graphics card at all while i render with opengl
or does the opengl render pixels and vertex in graphics card to display and all my code is using cpu?
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