Graphics.GL.ARB.ShaderSubroutine
glGetARBShaderSubroutine
gl_ARB_shader_subroutine
glGetActiveSubroutineName
glGetActiveSubroutineUniformName
glGetActiveSubroutineUniformiv
glGetProgramStageiv
glGetSubroutineIndex
glGetSubroutineUniformLocation
glGetUniformSubroutineuiv
glUniformSubroutinesuiv