Here is a list of all documented files with brief descriptions:

comparison.hpp	Include to use operators to compare whether two textures or images are equal
convert.hpp	Include to copy textures, images or a subset of either textures or an images
duplicate.hpp	Include to duplicate textures, images or a subset of either textures or an image
dx.hpp	Include to translate GLI enums to DirectX enums
filter.hpp	Include to use filter enum, to select filtering methods
format.hpp	Include to use the format enum and query properties of formats
generate_mipmaps.hpp	Include to generate mipmaps of textures
gl.hpp	Include to translate GLI enums to OpenGL enums
gli.hpp	Include to include everything in GLI which is not recommendated due to compilation time cost
image.hpp	Include to use images, a representation of a single texture level
index.hpp	Include to compute offset in a texture storage memory
levels.hpp	Include to compute the number of mipmaps levels necessary to create a mipmap complete texture
load.hpp	Include to load DDS, KTX or KMG textures from files or memory
load_dds.hpp	Include to load DDS textures from files or memory
load_kmg.hpp	Include to load KMG textures from files or memory
load_ktx.hpp	Include to load KTX textures from files or memory
reduce.hpp	Include to perform reduction operations
sampler.hpp	Include to use wrap modes and the sampler base class
sampler1d.hpp	Include to sample 1d textures
sampler1d_array.hpp	Include to sample 1d array textures
sampler2d.hpp	Include to sample 2d textures
sampler2d_array.hpp	Include to sample 2d array textures
sampler3d.hpp	Include to sample 3d textures
sampler_cube.hpp	Include to sample cube map textures
sampler_cube_array.hpp	Include to sample cube map array textures
save.hpp	Include to save DDS, KTX or KMG textures to files or memory
save_dds.hpp	Include to save DDS textures to files or memory
save_kmg.hpp	Include to save KMG textures to files or memory
save_ktx.hpp	Include to save KTX textures to files or memory
target.hpp	Include to use the target enum and query properties of targets
texture.hpp	Include to use generic textures which can represent any texture target but they don't have target specific built-in caches making accesses slower
texture1d.hpp	Include to use 1d textures
texture1d_array.hpp	Include to use 1d array textures
texture2d.hpp	Include to use 2d textures
texture2d_array.hpp	Include to use 2d array textures
texture3d.hpp	Include to use 3d textures
texture_cube.hpp	Include to use cube map textures
texture_cube_array.hpp	Include to use cube map array textures
transform.hpp	Include to perform arithmetic per texel between two textures
type.hpp	Include to use basic GLI types
view.hpp	Include create views of textures, either to isolate a subset or to reinterpret data without memory copy