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Texture Map
Texture map is an image that is used by OpenGL to color the
rasterized pixels.
Most of texture
maps must by square and
power-of-two to be able to work in most of hardward. Modern hardware allows loading non-power-of-two textures, but texture maps are still made power-of-two to support older
GPUs.
This article is a stub, it contains information that doesn't explain subject fully.