Make it clear we're just returning a D3D9 device, allowing for new functions to get other D3D versions

include/SDL_system.h

@@ -51,7 +51,7 @@ extern DECLSPEC int SDLCALL SDL_Direct3D9GetAdapterIndex( int displayIndex );
 
 /* Returns the D3D device associated with a renderer, or NULL if it's not a D3D renderer. */
 typedef struct IDirect3DDevice9 IDirect3DDevice9;
-extern DECLSPEC IDirect3DDevice9* SDLCALL SDL_RenderGetD3DDevice(SDL_Renderer * renderer);
+extern DECLSPEC IDirect3DDevice9* SDLCALL SDL_RenderGetD3D9Device(SDL_Renderer * renderer);
 
 #endif /* __WIN32__ */
 

src/render/direct3d/SDL_render_d3d.c

@@ -1884,7 +1884,7 @@ D3D_DestroyRenderer(SDL_Renderer * renderer)
 }
 
 IDirect3DDevice9 *
-SDL_RenderGetD3DDevice(SDL_Renderer * renderer)
+SDL_RenderGetD3D9Device(SDL_Renderer * renderer)
 {
 	D3D_RenderData *data = (D3D_RenderData *) renderer->driverdata;