The index of the rendering driver; the value ranges from 0 to SDL_GetNumRenderDrivers() - 1.
The name of the rendering driver at the requested index, or null if an invalid index was specified.
Threadsafety: It is safe to call this function from any thread.
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Use this function to get the name of a built in 2D rendering driver.
The list of rendering drivers is given in the order that they are normally initialized by default; the drivers that seem more reasonable to choose first (as far as the SDL developers believe) are earlier in the list.
The names of drivers are all simple, low-ASCII identifiers, like "opengl", "direct3d12" or "metal". These never have Unicode characters, and are not meant to be proper names.