Describes the display mode.
typedef struct D3DDISPLAYMODE {
UINT Width;
UINT Height;
UINT RefreshRate;
D3DFORMAT Format;
} D3DDISPLAYMODE, *LPD3DDISPLAYMODE;
IDirect3D9::EnumAdapterModes, IDirect3D9::GetAdapterDisplayMode, IDirect3DDevice9::GetDisplayMode