Quoting Klaus Niederkrueger kniederk@MI.Uni-Koeln.DE:
OpenGL has different TextureModes (1D, 2D, 3D) and WRAP is set independently for each of these. In Windows this setting changes all modes at one or not?
It applies to all uses of this texture coordinate regardless of the dimensionality of the texture or the texture coordinate.
What is the last texture coordinate doing in Windows? I have heard of 3D-Textures, but 4D?
4D is for projected (divide by the last coordinate) lookups.
Does not-wrapping correspond to GL_CLAMP under OpenGL?
D3DTSS_ADDRESS{U,V,W} supply a per-lookup address mode which defaults to clamp - this is applied after wrapping/not-wrapping is done.