GL_NV_fragment_program2
http://www.nvidia.com/dev_content/nvopenglspecs/GL_NV_fragment_program2.txt
	GL_MAX_PROGRAM_EXEC_INSTRUCTIONS_NV 0x88F4
	GL_MAX_PROGRAM_CALL_DEPTH_NV 0x88F5
	GL_MAX_PROGRAM_IF_DEPTH_NV 0x88F6
	GL_MAX_PROGRAM_LOOP_DEPTH_NV 0x88F7
	GL_MAX_PROGRAM_LOOP_COUNT_NV 0x88F8