code: func BindFragDataLocationIndexed(program uint32, colorNumber uint32, index uint32, name *uint8) {
  	syscall.Syscall6(gpBindFragDataLocationIndexed, 4, uintptr(program), uintptr(colorNumber), uintptr(index), uintptr(unsafe.Pointer(name)), 0, 0)
  }
docs: // bind a user-defined varying out variable to a fragment shader color number and index