GL_NV_vertex_program2_option
http://www.nvidia.com/dev_content/nvopenglspecs/GL_NV_vertex_program2_option.txt
GL_NV_vertex_program2_option
	GL_MAX_PROGRAM_EXEC_INSTRUCTIONS_NV 0x88F4
	GL_MAX_PROGRAM_CALL_DEPTH_NV 0x88F5
