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Controlling the Appearance of Texture Mapping Using Texture Mip-map Modes

Mip-mapping is an anti-aliasing technique that uses different texture versions at different distances from the viewer

You can have any number of levels

Level 0 is the base image used when the viewer is close

Mip-maps can be computed automatically from a base image:

Use a mip-mapping mode of BASE_LEVEL

Or you can specify each image level explicitly:

Use a mip-mapping mode of MULTI_LEVEL_MIPMAP