IDirect3DRMTexture and IDirect3DRMTexture2 Interfaces
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.
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. To avoid unnecessary delays when creating textures, hold onto textures you want to use again, instead of creating them each time they're needed. For optimal performance, use a texture surface format that is supported by the device you are using. This will avoid a costly format conversion when the texture is created and any time it changes.
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.
The IDirect3DRMTexture2 interface is an extension of the IDirect3DRMTexture interface. The IDirect3DRMTexture2::InitFromResource2 method allows resources to be loaded from DLLs and executables other than the currently executing file. In addition, IDirect3DRMTexture2 has two new methods. IDirect3DRMTexture2::InitFromImage creates a texture from an image in memory. This method is equivalent to IDirect3DRM::CreateTexture. IDirect3DRMTexture2::GenerateMIPMap generates a MIP map from a source image.
Textures are loaded from BMP and DIB (device-independent bitmap) files right-side up in IDirect3DRMTexture2::InitFromFile and IDirect3DRMTexture2::InitFromResource2, unlike IDirect3DRMTexture::InitFromFile and IDirect3DRMTexture::InitFromResource where they are loaded inverted.
For a reference to the methods of these interfaces, see IDirect3DRMTexture and IDirect3DRMTexture2.
This section describes the types of textures supported by Direct3D and how your application can use them.