OpenGL extension SGIX.blend_alpha_minmax
This module customises the behaviour of the OpenGL.raw.GL.SGIX.blend_alpha_minmax to provide a more Python-friendly API
Overview (from the spec)
Two additional blending equations are specified using the interface defined by EXT_blend_minmax. These equations are similar to the MIN_EXT and MAX_EXT blending equations, but the outcome for all four color components is determined by a comparison of just the alpha component's source and destination values. These equations are useful in image processing and advanced shading algorithms.
The official definition of this extension is available here:
Return boolean indicating whether this extension is available