{{update}}

{{notice|Note|You should also see the [[api_documentation]] for more in-depth information.}}

[[libcore]] is the name of the shared library that contains the core of the [[doomsday_engine]] version 2.((The actual file name depends on the platform:
  *  On Windows, it is **deng_core.dll**.
  *  On Mac OS X, it is **libdeng_core.dylib**.
  *  On Linux, it is **libdeng_core.so**.)) It is based on [[hawthorn]].


====== Doomsday 2 architecture ======


Doomsday 2 comprises a set of libraries that act as the foundation of [[doomsday_client]], Server, [[shell]], and other applications. Everything builds on [[libcore]], the core library that contains functionality essential to all applications.

{{ file:doomsday_2_component_architecture.png }}


===== Core library (libcore) =====

App, Library, base for subsystems, threading.


==== Data ====

Block, values, Variable, Record, Writer, Reader, byte ordering, reference counting, ZIP archives.


==== Internal file system ====

[[file_system|FS]], folders, native/archive files.


==== Network ====

Link, Protocol, packets.

Network architecture on the application level (sessions):

{{ file:sessions_and_users.png }}

//See also:// [[network_protocol]]


==== Scripting ====

Script, Parser, Process, Module, statements, expressions, functions.

{{ file:scripting_arch.png?700x0 }}


===== Shell library (libshell) =====


Connecting to servers, protocol for talking with servers. Generic UI components needed by the Shell apps and the UI framework.


===== GUI library (libgui) =====


[[libgui]] builds on [[libdeng2]] and adds functionality integral to GUI applications: OpenGL drawing, input events, and audio.


===== UI framework (libappfw) =====


The Doomsday UI framework is in its own library and contains a number of UI widgets and supporting functionality for tasks like laying out and drawing text.


===== Common application subsystems (libdoomsday) =====


[[libdoomsday]] contains all the common subsystems shared by [[doomsday_server]] and [[doomsday_client]].


===== Legacy / C language support (liblegacy) =====


[[liblegacy]] contains old supporting code (like the memory zone and dynamic strings for C) that was more relevant before C++ was taken into use. This library is intended to eventually become obsolete as more and more code is based on the newer libraries.


====== Version numbering ======

libcore version numbers are composed of the following parts:
  *  //Major version number:// 2.
  *  //Minor version number:// incremented once a set of long-term goals have been met.
  *  //Patchlevel:// incremented for patch releases.

In addition to the version number there is also the independent [[build_number]] as defined by the [[automated_build_system]].

The [[doomsday_client]] and [[doomsday_server]] use the same version number as libcore.


====== Footnotes ======

<references/>


====== See also ======

  *  [[refactor_engine_into_a_shared_library]]
  *  [[internal_file_system]]
  *  [[doomsday_script]]
  *  [[plugin_factory]]
  *  [[packaging_resources]]
  *  [[roadmap]]