A texture is a rectangular array of colored pixels. (The rectangle does not necessarily have to be square, although the system deals most efficiently with square textures.) You can use textures for texture-mapping faces, in which case their dimensions must be powers of two.
An IDirect3DRMTexture interface is actually an interface to a DirectDrawSurface object, not to a distinct Direct3D texture object. For more information about the relationship between textures in Direct3D and surfaces in DirectDraw, see Direct3D Texture Interface.
Your application can use the IDirect3DRM::CreateTexture method to create a texture from a D3DRMIMAGE structure, or the IDirect3DRM::CreateTextureFromSurface method to create a texture from a DirectDraw surface. The IDirect3DRM::LoadTexture method allows your application to load a texture from a file; the texture should be in Windows bitmap (.bmp) or Portable Pixmap (.ppm) format.
The texture coordinates of each face define the region in the texture that is mapped onto that particular face. Your application can use a wrap to calculate texture coordinates. For more information, see IDirect3DRMWrap Interface.
For a reference to the methods of this interface, see IDirect3DRMTexture.
This section describes the types of textures supported by Direct3D and how your application can use them.