OpenGL extension NV.texture_expand_normal
This module customises the behaviour of the OpenGL.raw.GL.NV.texture_expand_normal to provide a more Python-friendly API
Overview (from the spec)
This extension provides a remapping mode where unsigned texture components (in the range can be treated as though they contained signed data (in the range [-1,+1 ). This allows applications to easily encode signed data into unsigned texture formats.
The functionality of this extension is nearly identical to the EXPAND_NORMAL_NV remapping mode provided in the NV_register_combiners extension, although it applies even if register combiners are used.
The official definition of this extension is available here: