GL_ARB_provoking_vertex
https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_provoking_vertex.txt
GL_ARB_provoking_vertex

	GL_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION 0x8E4C
	GL_FIRST_VERTEX_CONVENTION 0x8E4D
	GL_LAST_VERTEX_CONVENTION 0x8E4E
	GL_PROVOKING_VERTEX 0x8E4F
	void glProvokingVertex (GLenum mode)
