public const uint GL_ACTIVE_SUBROUTINES  = 0x8DE5
public const uint GL_ACTIVE_SUBROUTINE_UNIFORMS  = 0x8DE6
public const uint GL_MAX_SUBROUTINES  = 0x8DE7
public const uint GL_MAX_SUBROUTINE_UNIFORM_LOCATIONS  = 0x8DE8
public const uint GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS  = 0x8E47
public const uint GL_ACTIVE_SUBROUTINE_MAX_LENGTH  = 0x8E48
public const uint GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH  = 0x8E49
public const uint GL_NUM_COMPATIBLE_SUBROUTINES  = 0x8E4A
public const uint GL_COMPATIBLE_SUBROUTINES  = 0x8E4B