Graphics.Rendering.OpenGL.Raw.EXT.ProvokingVertex
glGetEXTProvokingVertex
gl_EXT_provoking_vertex
gl_FIRST_VERTEX_CONVENTION_EXT
gl_LAST_VERTEX_CONVENTION_EXT
gl_PROVOKING_VERTEX_EXT
gl_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION_EXT
glProvokingVertexEXT