1GL_NV_fragment_program2 2http://www.nvidia.com/dev_content/nvopenglspecs/GL_NV_fragment_program2.txt 3GL_NV_fragment_program2 4 5 GL_MAX_PROGRAM_EXEC_INSTRUCTIONS_NV 0x88F4 6 GL_MAX_PROGRAM_CALL_DEPTH_NV 0x88F5 7 GL_MAX_PROGRAM_IF_DEPTH_NV 0x88F6 8 GL_MAX_PROGRAM_LOOP_DEPTH_NV 0x88F7 9 GL_MAX_PROGRAM_LOOP_COUNT_NV 0x88F8 10