OpenGL extension ARB.shading_language_packing
This module customises the behaviour of the OpenGL.raw.GL.ARB.shading_language_packing to provide a more Python-friendly API
Overview (from the spec)
This extension provides the GLSL built-in functions to convert a 32-bit unsigned integer holding a pair of 16-bit floating-point values to or from a two-component floating-point vector (vec2).
This mechanism allows GLSL shaders to read and write 16-bit floating-point encodings (via 32-bit unsigned integers) without introducing a full set of 16-bit floating-point data types.
This extension also adds the GLSL built-in packing functions included in GLSL version 4.00 and the ARB_gpu_shader5 extension which pack and unpack vectors of small fixed-point data types into a larger scalar. By putting these packing functions in this separate extension it allows implementations to provide these functions in hardware that supports them independent of the other ARB_gpu_shader5 features.
In addition to the packing functions from ARB_gpu_shader5 this extension also adds the missing [un]packSnorm2x16 for completeness.
The official definition of this extension is available here:
Return boolean indicating whether this extension is available