'''OpenGL extension EXT.provoking_vertex

This module customises the behaviour of the 
OpenGL.raw.GL.EXT.provoking_vertex to provide a more 
Python-friendly API

Overview (from the spec)
	
	This extension provides an alternative provoking vertex convention
	for rendering lines, triangles, and (optionally depending on the
	implementation) quads.
	
	The provoking vertex of a primitive is the vertex that determines the
	constant primary and secondary colors when flat shading is enabled.
	
	In OpenGL, the provoking vertex for triangle, quad, line, and
	(trivially) point primitives is the last vertex used to assemble
	the primitive.  The polygon primitive is an exception in OpenGL where
	the first vertex of a polygon primitive determines the color of the
	polygon, even if actually broken into triangles and/or quads.
	
	See section 2.14.7 (Flatshading) of the OpenGL 2.1 specification,
	particularly Table 2.12 for more details.
	
	Alternatively the provoking vertex could be the first vertex of
	the primitive.  Other APIs with flat-shading functionality such
	as Reality Lab and Direct3D have adopted the "first vertex of the
	primitive" convention to determine the provoking vertex.  However,
	these APIs lack quads so do not have a defined provoking vertex
	convention for quads.
	
	The motivation for this extension is to allow applications developed
	for APIs with a "first vertex of the primitive" provoking vertex to
	be easily converted to OpenGL.

The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/provoking_vertex.txt
'''
from OpenGL import platform, constants, constant, arrays
from OpenGL import extensions, wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.EXT.provoking_vertex import *
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