TEXTURE_NPOT - Non power of two
textures are supported by the hardware.
TEXTURE_NPOT_BASIC - The
hardware supports non power of two textures, but you also need to check the
TEXTURE_NPOT_MIPMAP and
TEXTURE_NPOT_REPEAT features to know if the hardware
supports npot texture mipmaps or repeat modes other than COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE respectively.
TEXTURE_NPOT_MIPMAP -
Mipmapping is supported in conjuntion with non power of two textures.
TEXTURE_NPOT_REPEAT -
Repeat modes other than COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE are supported by the hardware.