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These fields are applied to the texture being read in. Some are specific to different types of textures (like bump maps) and will be ignored if the TXI belongs to a texture which is not of the same type. I will try to document these cases.
Cube
Defines that the associated texture is a cubemap. Allowed values are 0 or 1. Default is 0.
cube 1
Decal
Renders the texture on top of anything it's flush with. Black areas of texture will be transparent. Allowed values are 0 or 1. Default is 0.
decal 1
DefaultWidth / DefaultHeight
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Specify the number of pixels that the texture can wrap.
clamp 3
Filter
Specify whether to filter the texture using linear filtering or not. If set to 0, filtering is nearest, otherwise it is linear. Default filtering is linear.
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