1GL_NV_vertex_program2_option 2http://www.nvidia.com/dev_content/nvopenglspecs/GL_NV_vertex_program2_option.txt 3GL_NV_vertex_program2_option 4 5 GL_MAX_PROGRAM_EXEC_INSTRUCTIONS_NV 0x88F4 6 GL_MAX_PROGRAM_CALL_DEPTH_NV 0x88F5 7