A variable that specifies a GPU backend to use.
Defined in <SDL3/SDL_hints.h>
#define SDL_HINT_GPU_DRIVER "SDL_GPU_DRIVER"
By default, SDL will try all available GPU backends in a reasonable order until it finds one that can work, but this hint allows the app or user to force a specific target, such as "direct3d11" if, say, your hardware supports D3D12 but want to try using D3D11 instead.
This hint should be set before SDL_GPUSelectBackend() is called.
This hint is available since SDL 3.0.0.