Describes a volume.
typedef struct D3DVOLUME_DESC {
D3DFORMAT Format;
D3DRESOURCETYPE Type;
DWORD Usage;
D3DPOOL Pool;
UINT Width;
UINT Height;
UINT Depth;
} D3DVOLUME_DESC, *LPD3DVOLUME_DESC;
IDirect3DVolume9::GetDesc, IDirect3DVolumeTexture9::GetLevelDesc