OpenGL extension ATI.texture_mirror_once
This module customises the behaviour of the OpenGL.raw.GL.ATI.texture_mirror_once to provide a more Python-friendly API
Overview (from the spec)
ATI_texture_mirror_once extends the set of texture wrap modes to include two modes (GL_MIRROR_CLAMP_ATI, GL_MIRROR_CLAMP_TO_EDGE_ATI) that effectively use a texture map twice as large as the original image in which the additional half of the new image is a mirror image of the original image.
This new mode relaxes the need to generate images whose opposite edges match by using the original image to generate a matching "mirror image". This mode allows the texture to be mirrored only once in the negative s, t, and r directions.
The official definition of this extension is available here: