SDL_GetDirect3D9AdapterIndex - Man Page

Defined in SDL3/SDL_system.h

#include "SDL3/SDL.h"

int SDL_GetDirect3D9AdapterIndex(SDL_DisplayID displayID);

The returned adapter index can be passed to IDirect3D9::CreateDevice and controls on which monitor a full screen application will appear.

displayID

the instance of the display to query.

Returns the D3D9 adapter index on success or -1 on failure; call

SDL_GetError () for more information.

This function is available since SDL 3.2.0.